JP4957861B1 - Auxiliary material-containing seed coating iron powder, secondary material-attached seed coating iron powder, seed coating alloy steel powder and secondary material-containing seed coating iron powder, secondary material-attached seed coating iron powder or seed coating alloy steel powder Seeds coated with - Google Patents

Abstract

The present invention provides a secondary material that can realize a coating with less iron powder dropping not only in a seeding process but also in a transportation process, and can attach a secondary material useful for seed growth to the seed in a manner preferable for seed growth. Iron powder for seed coating, iron powder for seed coating, iron powder for seed coating, alloy powder for seed coating, iron powder for seed coating containing secondary material, iron powder for seed coating of secondary material or alloy steel powder for seed coating Get seeds.
An auxiliary material-containing iron powder for seed coating according to the present invention contains 0.01 to 100 parts by mass of an auxiliary material powder with respect to 100 parts by mass of the iron powder, and the iron powder has a particle size of 63 μm or less. The iron powder mass ratio is 0% to 75%, the iron particle mass ratio is more than 63 μm and less than 150 μm, and the iron powder mass ratio is more than 25% to 100% and the particle diameter is more than 150 μm. Is 0% or more and 50% or less, and the average particle size of the auxiliary material powder is 45 μm or less.
[Selection] Figure 1

Description

  The present invention relates to an iron powder for seed coating containing an auxiliary material suitable for seed coating and suitable for seed germination, an iron powder for seed coating of an auxiliary material, an alloy steel powder for seed coating, and an iron powder for seed coating containing an auxiliary material Further, the present invention relates to a seed coated with an iron powder for covering a secondary material or an alloy steel powder for coating a seed.

  Along with the aging of farmers and the globalization of agricultural product distribution, labor saving in agricultural work and reduction in agricultural production costs are issues to be solved. In order to solve these problems, for example, in paddy rice cultivation, a direct sowing method in which seeds are directly sown in a field is becoming widespread for the purpose of eliminating the trouble of raising seedlings and transplanting. Among them, in order to increase the specific gravity of seeds, a technique using seeds coated with iron powder has been attracting attention because of its merit of preventing floating and outflow of seeds in paddy fields and preventing bird damage.

  Thus, in order to utilize the direct sowing cultivation method using the seed coated with iron powder, it is required that the coated iron powder film is difficult to peel off in the transportation and sowing process. When the iron powder coating peels, the specific gravity of the seeds decreases and the above-mentioned merits are not obtained. This is because the peeled fine iron powder can cause dust. For this reason, peeling of the iron powder coating must be suppressed as much as possible.

As a technique for attaching and solidifying iron powder on the surface of rice seeds, Patent Document 1 proposes the following technique as a method for producing iron powder-coated rice seeds.
“To the rice seeds, iron powder, and 0.5-2% by weight of sulfate (excluding calcium sulfate) and / or chloride in a mass ratio to the iron powder, and further granulated by adding water, A method for producing iron powder-coated rice seeds, characterized in that iron powder is attached to solidified rice seeds by rust generated by oxidation reaction of metallic iron powder by supplying water and oxygen, and then dried. (See claim 1 of Patent Document 1)

  In the invention described in Patent Document 1, since the rice seeds are sown using a power spreader or a seeder, strength characteristics that do not collapse due to mechanical impact are necessary. The coating disintegration degree is measured by a method of measuring the degree of coating disintegration (hereinafter referred to as coating disintegration test), that is, a method of dropping a steel sheet having a thickness of 1.3 m to a steel plate with a thickness of 3 mm and giving a mechanical impact. It has been confirmed that practical strength is obtained.

  In Patent Document 1, no particular attention is paid to the iron powder particle size distribution, but when iron powder having the particle size distribution shown in Table 1 below is used for coating, In the disintegration test, it is said that practical impact strength can be maintained.

  Further, in Patent Document 1, silica gel is cited as an example of a nutrient that can be coated, because it is possible to coat nutrients useful for rice growth and auxiliary materials such as agricultural chemicals at the same time as iron powder (Patent Document 1). 1 paragraph [0030]).

Japanese Patent No. 44441645

Regarding the adhesion strength of the iron powder coating, Patent Document 1 discusses the collapse of the iron powder coating due to the impact caused by the drop in the seeding process. Therefore, as a strength test, a disintegration test is performed in which a mechanical impact is applied by dropping the steel sheet 5 times from a height of 1.3 m to a steel plate having a thickness of 3 mm.
However, rice seeds are subjected to mechanical external force not only in the sowing process but also in the transport process, as described above. And the mechanical external force which a rice seed receives in a transportation process is the frictional force of the sliding and rolling which arise between seeds or between a seed and a container other than the impact by fall.

When receiving an impact due to dropping, the iron powder coating is peeled off by cracking, but when receiving a frictional force, it is gradually peeled off by abrasion.
Therefore, in order to prevent the iron powder coating from peeling off not only in the seeding process but also in the transportation process, a coating having strength against frictional force is required.
However, there has been no technology for realizing iron powder that can cover rice seeds with sufficient strength against sliding and rolling frictional stress of seeds or seeds coated with iron powder.

Moreover, as shown in Table 1, the particle size distribution of the iron powder described in Patent Document 1 has a large proportion of particle sizes of 63 μm or less.
However, when fine iron powder is used, the iron powder reacts rapidly with oxygen in the air, and the seed coated with the iron powder may be damaged by heat generation, or cause a fire when handling a large amount of iron powder. There are also concerns. In addition, since fine iron powder tends to generate dust, there is a problem that it is difficult to maintain a clean working environment.

Furthermore, in Patent Document 1, although it is stated that auxiliary materials such as nutrients and agricultural chemicals useful for rice growth are coated at the same time as iron powder, in what form the auxiliary materials are coated on rice seeds. There is no mention as to whether is most preferred for rice growth.
In Patent Document 1, in FIG. 2, the auxiliary material is mixed with iron powder and coated with rice seeds. In such an aspect, the auxiliary material at the outermost edge is easily dissipated. It may not be possible to effectively contribute to the germination of rice seeds.

The present invention has been made in order to solve such problems, and can provide a coating with less dropping of iron powder not only in the sowing process but also in the transport process, and is a useful auxiliary material for seed growth. Auxiliary material-containing seed coating iron powder, secondary material-attached seed coating iron powder, seed coating alloy steel powder, secondary material-containing seed coating iron powder, and auxiliary material-attached seed coating It is intended to obtain seeds coated with iron powder for seed or alloy steel powder for seed coating.
Also, it is intended to obtain iron powder for seed coating containing auxiliary materials, iron powder for seed coating with attached secondary materials, and alloy steel powder for seed coating that are less likely to damage rice seeds and are easy to handle. It is said.

The inventor conducted the following studies for each of prevention of peeling of iron powder and adhesion of secondary materials.
<Preventing peeling of iron powder>
By observing the surface of rice seeds, we examined what particle size of iron powder would be effective in preventing peeling.
The inventor has focused on the condition of the surface of rice seeds. As shown in FIG. 1, hair 5 grows on the surface of rice husk 3 which is the outermost shell of rice seed pod 1, and when the seed pod 1 is coated with iron powder, the elastic action of the hair 5 causes It is presumed that the adhesion force is increased by holding the iron powder arranged between the bristles 5 to the bristles 5.
As shown on page 21 of “Seeing the Microscopic Structure of Rice (by Takamasa Mezaki)”, the way the hairs 5 grow is also dense. In particular, it is considered that the adhesion force is increased by the iron powder being held by the hairs 5 at the site where the hairs 5 are dense, and the interval between the hairs 5 at this site is 50 to 150 μm.
From this, the inventor considers that there is an appropriate range for the particle diameter of the iron powder that can be firmly attached to the rice seeds by the holding action by the hair 5, and the iron powder particle diameter for effectively exhibiting this holding action. As a result, it was found that a particle diameter of more than 63 μm and 150 μm or less is preferable.
From this, the knowledge that the particle diameter exceeds 63 μm and includes 150 μm or less to some extent can be expected to be retained by the hair 5, and the amount of peeling of the coating film caused by seed rolling or slipping can be reduced. It was.

The inventor also examined the particle size of the iron powder that passes through the hair 5 and adheres directly to the surface of the rice seed, in addition to the adhesion due to the holding power of the hair 5 of the rice seed.
In general, the smaller the particle size of the powder, the higher the adhesion to the adherend. Therefore, the particle size of the iron powder is preferably small in the sense that it is directly attached to the surface of the rice seed.
As a result of examining the iron powder particle size that can be expected to pass directly between the rice seed hairs 5 and directly adhere to the surface of the rice seed, it was found that a predetermined amount of iron powder of 45 μm or less is preferable.
And by containing the iron powder of the said fine particle size in addition to the iron powder hold | maintained by the hair 5, the iron powder of a fine particle size adheres to the surface of a rice seed, and iron above the hair 5 by iron 5 The powder was retained, and the iron powder was double-coated, and the knowledge that the amount of peeling of the coating film caused by the rolling and slipping of seeds can be reduced was obtained.
However, if the iron powder having a small particle size is contained in a large amount, the above-described problems occur, so that it is necessary to be a predetermined amount or less.

  Further, if the particle size of the iron powder is too large, not only does it not easily enter the gap between the hairs 5, but also the gravity acting on the iron powder particles is large and the hairs 5 cannot hold the iron powder particles, so the adhesion effect is reduced. Presumed. Accordingly, it was also found that the ratio of the iron powder having a particle size of 150 μm or more is preferably set to a predetermined amount or less.

  The above investigation is conducted only for iron powder. However, if secondary material adheres to iron powder, it is applicable to the iron powder adhered to secondary material, or alloy steel when iron powder and secondary material are alloyed. This is true for flour.

<Adhesion of secondary materials>
The inventor paid attention to a molybdenum compound as an auxiliary material. Molybdenum compounds (for example, molybdenum oxide) are known to have an action of suppressing the generation of sulfide ions that inhibit seed germination in the soil.
Therefore, the inventors examined how it is most effective to attach the molybdenum oxide powder to the seed when the seed is coated with the iron powder having a high anti-peeling effect as described above.

The auxiliary material such as molybdenum oxide is preferably present in the vicinity of the seed when the directly sown seed germinates from the viewpoint of enhancing the germination promotion effect.
As an aspect in which the auxiliary material is present in the vicinity of the seed, the optimum particle size of the auxiliary material is specified and mixed, the auxiliary material is attached to the iron powder in advance, and the auxiliary material is integrated with the iron powder. The knowledge that it was preferable was obtained.

In addition, although the said examination was demonstrated taking the rice seed as an example, the same thing can be said if it is a seed which has hair on the surface like a rice seed, for example, seeds, such as wheat, a carrot, a tomato.
In the above examination, molybdenum oxide is taken as an example of the auxiliary material, but the same can be said as long as it can contribute to seed germination. Examples of such auxiliary materials include tungsten oxide, vanadium oxide, manganese, copper, nickel, boron, and sulfur.

  The present invention has been made on the basis of the above findings, and specifically comprises the following constitution.

(1) The auxiliary material-containing iron powder for seed coating according to the present invention contains 0.01 to 100 parts by mass of the auxiliary material powder with respect to 100 parts by mass of the iron powder, and the iron powder has a particle diameter of 63 μm or less. The mass ratio of the iron powder is 0% or more and 75% or less, the mass ratio of the iron powder having a particle diameter exceeding 63 μm and 150 μm or less is 25% or more and 100% or less, and the mass ratio of the iron powder exceeding 150 μm. It is 0% or more and 50% or less, and the average particle size of the auxiliary material powder is 45 μm or less.

(2) Further, in the above (1), the auxiliary material is a single element of molybdenum or a molybdenum compound.

(3) Moreover, in the thing as described in said (1) or (2), the mass ratio of the iron powder whose particle diameter is 45 micrometers or less is 0% or more and 30% or less, It is characterized by the above-mentioned.

(4) Moreover, in the thing in any one of said (1) thru | or (3), the mass ratio of the iron powder whose particle diameter exceeds 63 micrometers and is 150 micrometers or less is 50% or more, It is characterized by the above-mentioned. .

(5) Moreover, in the thing in any one of said (1) thru | or (4), iron powder was manufactured by the reduction method or the atomizing method, It is characterized by the above-mentioned.

(6) The seed according to the present invention is characterized in that the seed is coated with the iron powder for seed coating containing the auxiliary material according to any one of (1) to (5) above.

(7) Further, in the above (6), the seed is a rice seed.

(8) The secondary material-attached seed coating iron powder according to the present invention is a secondary material-attached seed coating iron powder used for coating seeds, wherein the secondary material is attached to the iron powder,
The iron powder for seed coating with a secondary material adhering to the secondary material has a mass ratio of 0% or more and 75% or less, and a particle diameter of more than 63 μm and 150 μm or less. The mass ratio of the iron powder for seed coating is 25% or more and 100% or less, and the mass ratio of the iron powder for seed coating with a secondary material exceeding 150 μm is 0% or more and 50% or less. is there.

(9) Moreover, in the thing as described in said (8), the said iron powder for seed coating with a secondary material attaches 0.01-100 mass parts of secondary materials with respect to 100 mass parts of iron powder. It is a feature.

(10) Further, in the above (8) or (9), the auxiliary material is a single element of molybdenum or a molybdenum compound.

(11) Moreover, in the thing in any one of said (8) thru | or (10), the said iron powder for seed coating with a secondary material is a mass ratio of the iron powder for seed coating with a secondary material with a particle diameter of 45 micrometers or less. Is 0% or more and 30% or less.

(12) Further, in any of the above (8) to (11), the mass ratio of the iron powder having a particle diameter of more than 63 μm and 150 μm or less is 50% or more. .

(13) Further, in any of the above (8) to (12), the iron powder is manufactured by a reduction method or an atomization method.

(14) A seed according to the present invention is characterized in that the seed is coated with the iron powder for covering a secondary material attached seed according to any one of (8) to (13).

(15) Further, in the above (14), the seed is a rice seed.

(16) The alloy steel powder for seed coating according to the present invention is an alloy steel powder for seed coating used for coating seeds, comprising an alloy of iron and secondary materials,
The alloy steel powder for seed coating is an alloy steel powder for seed coating having a mass ratio of 0% to 75% and a particle diameter of more than 63 μm and 150 μm or less. The mass ratio of the alloy steel powder for seed coating having a mass ratio of 25% or more and 100% or less and a particle diameter exceeding 150 μm is 0% or more and 50% or less.

(17) Further, in the above (16), the alloy steel powder for seed coating contains 0.01 to 100 parts by mass of an auxiliary material with respect to 100 parts by mass of iron. Is.

(18) Further, in the above (16) or (17), the auxiliary material is molybdenum.

(19) Moreover, in the thing in any one of said (16) thru | or (18), as for the said alloy steel powder for seed coating, the mass ratio of the alloy steel powder for seed coating whose particle diameter is 45 micrometers or less is 0% or more. It is characterized by being 30% or less.

(20) Further, in any of the above (16) to (19), the mass ratio of the iron powder having a particle diameter of more than 63 μm and 150 μm or less is 50% or more. .

(21) In addition, in any of the above (16) to (20), the alloy steel powder for seed coating is manufactured by a reduction method or an atomization method.

(22) The seed according to the present invention is characterized in that the seed is coated with the alloy steel powder for seed coating described in any of (16) to (21) above.

(23) Further, in the above (22), the seed is a rice seed.

According to the present invention, for example, rice seeds having hair on the seed surface can be expected to be retained by hair, and not only in the sowing process but also in the transport process, iron powder, iron powder for covering secondary seeds, It is possible to realize a coating with less dropping of the alloy steel powder for coating.
In addition, a secondary material useful for seed germination can be present in the vicinity of the seed when the seed germinates, and the effect of promoting germination can be enhanced.

It is explanatory drawing explaining the state of the surface of a rice seed.

[Embodiment 1]
The present embodiment relates to an auxiliary material-containing seed-coated iron powder in which iron powder and an auxiliary material are mixed in advance.
The secondary material-containing iron powder for seed coating according to one embodiment of the present invention contains 0.01 to 100 parts by mass of secondary material powder with respect to 100 parts by mass of iron powder, and the iron powder has a particle size of 63 μm. The mass ratio of the following iron powder is 0% to 75%, and the mass ratio of the iron powder having a particle size of more than 63 μm and 150 μm or less is 25% to 100% and the particle size of the iron powder is more than 150 μm. The ratio is 0% or more and 50% or less, and the average particle diameter of the auxiliary material powder is 45 μm or less.
Hereinafter, each configuration will be described in detail.

<Iron powder>
The reason why the iron powder having a particle diameter of more than 63 μm and not more than 150 μm is 25% or more is that the iron powder having a particle diameter of more than 63 μm and not more than 150 μm has a high probability of being held by the hair on the seed surface. By containing 25% or more of particles having a particle size, retention by hair can be expected, and a coating with less dropping of iron powder can be realized not only in the sowing process but also in the transport process. The mass ratio of the iron powder having a particle diameter of more than 63 μm and 150 μm or less is preferably 30% or more, and more preferably 50% or more.

  Moreover, the mass ratio of the iron powder having a particle size of 63 μm or less was set to 75% or less because when the content of the iron powder having a small particle size increases, the iron powder reacts rapidly with oxygen in the air, resulting in heat generation. There is a possibility that the seed coated with iron powder may be damaged or cause a fire when handling a large quantity. Furthermore, if the content of fine iron powder is large, dust is easily generated and a clean working environment is maintained. It is difficult. The mass ratio of iron powder having a particle size of 63 μm or less is preferably 70% or less.

In addition, as a more preferable content aspect of the iron powder having a particle diameter of 63 μm or less, the mass ratio of the iron powder having a particle diameter of 45 μm or less is 0% or more and 30% or less.
Iron powder having a particle diameter of 45 μm or less slips through the hair on the surface of the seed and has a strong adhesive force to adhere directly to the surface of the seed. Realized.

  The reason why the mass ratio of the iron powder having a particle diameter exceeding 150 μm is set to 50% or less is that the iron powder having a particle diameter exceeding 150 μm cannot be expected to be held by hair and directly attached to the seed surface. The purpose is to reduce things.

  In addition, the particle size distribution of iron powder can be evaluated by sieving using the method defined in JIS Z2510-2004.

  As iron powder in the present embodiment, reduced iron powder produced by reducing mill scale, atomized iron powder produced by water atomizing molten steel, electrolytic iron powder, pulverized iron powder, or the like can be used. Further, these iron powders can be used without being subjected to heat treatment for high purity. For example, the atomized iron powder is usually heated in a reducing atmosphere (for example, a hydrogen atmosphere) after atomization to perform a process of reducing C and O from the iron powder. However, it is also possible to use so-called “as-atomized” iron powder that is not subjected to such heat treatment as the iron powder as the raw material of the present invention.

<Sub-material>
The auxiliary material has a mean particle size of 45 μm or less, which can contribute to seed germination.
As an auxiliary material, molybdenum alone or a molybdenum compound is preferable because it has an effect described later. For example, molybdenum oxide can be exemplified.
The action of molybdenum oxide is as follows.
In the soil or on the soil surface, sulfate ions (SO ₄ ²⁻ ) are decomposed into sulfur and oxygen by the action of sulfate-reducing bacteria, and sulfide ions generated thereby inhibit seed germination.
Molybdenum oxide (MoO ₃ ) becomes molybdate ions (MoO ₄ ²⁻ ) in the soil or on the soil surface, suppressing the decomposition of sulfate ions into sulfide ions and preventing the generation of harmful sulfide ions. To do.
The auxiliary material, for example, molybdenum oxide powder, has an average particle size of 45 μm or less.

Since the particle size of the secondary material, for example, molybdenum oxide powder, is in the above range, the secondary material (molybdenum oxide) is mixed with the above iron powder to coat the seed, so that the secondary material (molybdenum oxide) is mixed with the iron powder having a small particle size. It adheres directly to the surface and the surroundings are coated with iron powder having a large particle size.
For this reason, when seeds coated with iron powder for seed coating containing secondary material are directly sown, the secondary material (molybdenum oxide) is covered with iron powder, so that the secondary material (molybdenum oxide) does not dissipate and germinate seeds. Effective action.
In addition, since the molybdenum oxide powder is white, if white molybdenum oxide is attached to the surface of the seeds by gluing or the like, the white is easy to find for birds, so it is easy for birds to eat directly sown seeds. As in the embodiment, when the coated iron powder is oxidized to exhibit a light brown to black color with low brightness, there is also an effect that it is less noticeable to birds and seeds are difficult to eat.
In addition, it is preferable that content of submaterials, such as a molybdenum oxide, shall be 0.01-100 mass parts with respect to 100 mass parts of iron powder. If it is 0.01 mass part or more, the effect of an auxiliary material mentioned above will be acquired. If it is 100 parts by mass or less, the iron powder-coated seeds do not become nearly white, and the specific gravity of the iron powder-coated seeds does not decrease and does not flow out.
In the above examination, molybdenum oxide is taken as an example of the auxiliary material, but the same can be said if it can contribute to seed germination and has an average particle diameter of 45 μm or less.
Examples of such auxiliary materials include tungsten oxide and vanadium oxide.

There is no restriction on the method of seed coating with iron powder.
For example, as shown in the “Iron Coating Direct Seeding Manual 2010 (edited by the National Agricultural Research Center for Agricultural and Food Industry, Kinki Chugoku Shikoku Research Center)” Any method such as a method using a known mixer may be used.
As the mixer, for example, a stirring blade type mixer (for example, a Henschel mixer) or a container rotation type mixer (for example, a V type mixer, a double cone mixer, a tilt rotation type bread type mixer, a rotary mulberry type mixer, etc.) can be used. .
Further, as shown in the iron coating soaking direct sowing manual 2010 described above, a coating reinforcing agent such as calcined gypsum can be used for iron powder coating.

[Embodiment 2]
This Embodiment is related with the iron powder for seed coating of a secondary material adhesion which made the secondary material adhere to the iron powder.
The inventor paid attention to a molybdenum compound as an auxiliary material to be attached to the iron powder. Molybdenum compounds (for example, molybdenum oxide) are known to have an action of suppressing the generation of sulfide ions that inhibit seed germination in the soil.
Therefore, the inventor examined how it is most effective to attach molybdenum to the seed when the seed is coated with the iron powder having a high anti-peeling effect as described above.

The auxiliary material such as molybdenum oxide is preferably present in the vicinity of the seed when the directly sown seed germinates from the viewpoint of enhancing the germination promotion effect. For this reason, it is preferable that the auxiliary material is previously attached to the seed.
By the way, when adhering the above-mentioned auxiliary material powder to the seed, for example, a method of adhering the auxiliary material powder after previously coating the seed with a binder such as PVA (polyvinyl alcohol) can be applied.
However, in such a method, there is a problem that a large variation is likely to occur in the adhesion rate of the secondary material between the seeds, particularly when a small amount of the secondary material is adhered.
Then, the inventor thought that adhering a secondary material to the iron powder which coat | covers a seed beforehand may lead to the solution of the said problem.
That is, by attaching a molybdenum compound to the iron powder in advance and coating the seed with the iron powder to which the molybdenum compound is attached, the molybdenum can be uniformly attached to the surface of the rice seed together with the iron powder. As a result, molybdenum does not dissipate and coats the seeds without variation between the seeds, and thus can effectively contribute to seed germination.

In the above examination, molybdenum oxide is taken as an example of the auxiliary material, but the same can be said if it is an element that contributes to seed germination and is essential for plant growth.
Examples of such auxiliary materials include manganese, copper, nickel, boron, and sulfur.

The secondary material-attached seed coating iron powder of the present embodiment has been made on the basis of the above examination, and specifically, is as follows.
The iron powder for covering a secondary material adhering seed according to an embodiment of the present invention is characterized in that the secondary material adheres to the iron powder, and the iron powder for covering a secondary material adhering seed has a particle diameter of 63 μm. The mass ratio of the following secondary material-attached seed coating iron powder is 0% or more and 75% or less, and the mass ratio of the secondary material-attached seed coating iron powder having a particle diameter of more than 63 μm and 150 μm or less is 25% or more and 100% or less. In addition, the mass ratio of the iron powder for covering a secondary material adhering seed having a particle diameter exceeding 150 μm is 0% or more and 50% or less.
Hereinafter, each configuration will be described in detail.

<Iron powder for coating seeds attached to secondary materials>
The mass ratio of the secondary material-attached seed coating iron powder having a particle diameter of more than 63 μm and 150 μm or less is 25% or more because the secondary material-attached seed coating iron powder having a particle diameter of more than 63 μm and 150 μm or less Probability of being held by hair is high, and by containing 25% or more of such a particle size, retention by hair can be expected, and iron powder for covering secondary seeds is removed not only in the sowing process but also in the transport process This is because it is possible to realize a coating with less.
The mass ratio of the auxiliary material-attached seed coating iron powder having a particle diameter of more than 63 μm and 150 μm or less is preferably 30% or more, and more preferably 50% or more.

In addition, the mass ratio of the iron powder for coating the secondary material adhering seed having a particle size of 63 μm or less was set to 75% or less. The seed coating iron powder reacts rapidly with oxygen in the air, and there is a possibility that the seed coated with the iron powder for seed coating adhering to the secondary material may be damaged by heat generation, or cause a fire when handling a large amount, In addition, if the amount of fine iron powder for covering seeds adhering to secondary materials is large, dust is likely to be generated and it is difficult to maintain a clean working environment.
The mass ratio of the secondary material-attached seed coating iron powder having a particle size of 63 μm or less is preferably 70% or less.

In addition, as a more preferable content of the iron powder for coating a secondary material adhering seed having a particle size of 63 μm or less, the mass ratio of the iron powder for coating a secondary material adhering seed having a particle size of 45 μm or less is 0% or more and 30% or less. .
By adhering a predetermined amount, the iron powder for seed coating with a secondary material having a particle diameter of 45 μm or less slips through the hair on the surface of the seed and has a strong adhesive force directly attached to the surface of the seed. The double coating described above is realized.

  The mass ratio of the secondary material-attached seed coating iron powder having a particle diameter of more than 150 μm is set to 50% or less because the secondary material-attached seed coating iron powder having a particle diameter of more than 150 μm is held by hair and directly on the seed surface. Since the adhesion of the particles cannot be expected, the purpose is to reduce the particle size.

  In addition, the particle size distribution of the iron powder for auxiliary material adhesion seed coating can be evaluated by sieving using a method defined in JIS Z2510-2004.

  In addition, as iron powder used as the raw material for the iron powder for adhering to the secondary material, reduced iron powder, atomized iron powder, electrolytic iron powder, pulverized iron powder, or the like may be used as in the iron powder of the first embodiment. it can. Further, these iron powders can be used without being subjected to heat treatment for high purity. For example, the atomized iron powder is usually heated in a reducing atmosphere (for example, a hydrogen atmosphere) after atomization to perform a process of reducing C and O from the iron powder. However, it is also possible to use so-called “as-atomized” iron powder that is not subjected to such heat treatment as the iron powder as the raw material of the present invention.

<Sub-material>
The auxiliary material is useful for seed germination and growth.
Examples of the auxiliary material include molybdenum alone or a molybdenum compound, for example, molybdenum oxide.
As described in Embodiment 1, the action of molybdenum is as follows.
In the soil or on the soil surface, sulfate ions (SO ₄ ²⁻ ) are decomposed into sulfide ions (S ²⁻ ) and oxygen (O ₂ ) by the action of sulfate-reducing bacteria, and sulfide ions (S ² ) generated thereby. ^2- ) inhibits seed germination.
Molybdenum (Mo) becomes molybdate ions (MoO ₄ ²⁻ ) in the soil or on the soil surface, suppresses the decomposition of sulfate ions into sulfide ions, and prevents the generation of harmful sulfide ions.

By coating the seed using the iron powder for seed coating with the secondary material (molybdenum oxide) attached to the secondary material (molybdenum oxide), the secondary material (molybdenum oxide) is applied to the seed surface as iron powder for seed coating with the secondary material attached. It will be uniformly dispersed and deposited.
When such seeds are directly sown, the secondary material (molybdenum oxide) does not dissipate and acts effectively on seed germination. Moreover, since the dispersion | variation in the submaterial (molybdenum oxide) adhesion rate between seeds is small, the dispersion | variation in germination and a growth can be suppressed. Furthermore, since the secondary material (molybdenum oxide) adheres to the surface of the iron powder, the secondary material (molybdenum oxide) melts relatively early and can contribute to germination early.
Also, since the molybdenum oxide powder is white, if white molybdenum oxide is attached to the surface of the seed by gluing or the like, the white is easy to find for birds, so it is easy for birds to eat directly sown seeds. The iron powder that constitutes the iron powder for adhering seeds with secondary materials coated with seeds as in the embodiment is oxidized and exhibits a light brown-black color with low brightness, which makes it difficult for birds to find and seeds to be eaten. There is also an effect.

In addition, it is preferable that the adhesion amount of secondary materials like molybdenum oxide shall be 0.01-100 mass parts with respect to 100 mass parts of iron powder. If it is 0.01 mass part or more, the effect of an auxiliary material mentioned above will be acquired. If the molybdenum oxide is 100 parts by mass or less, the iron powder for covering the auxiliary material attached seeds does not become white and cannot be eaten by birds.
In addition, if the auxiliary material (molybdenum oxide) is 100 parts by mass or less, the specific gravity of the iron powder for covering the auxiliary material attached seed is not reduced, and therefore the specific gravity of the seed coated with the iron powder for covering the auxiliary material attached seed is not reduced. Therefore, the seed does not float or flow out in the paddy field.

<Method of adhering secondary materials to iron powder>
As a method of adhering the auxiliary material to the iron powder, a method of diffusing and adhering the auxiliary material to the surface of the iron powder by heat treatment (hereinafter referred to as “diffusion adhesion”) and an iron powder using a paste without heat treatment are used. There are methods for attaching secondary materials to the surface (hereinafter referred to as “binder adhesion”), and methods for mechanically attaching by collision energy (hereinafter referred to as “mechanical adhesion”), but the adhesion method is limited. is not.

[Diffusion adhesion]
The method of diffusion adhesion will be outlined with an example of using molybdenum oxide powder as a secondary material powder.
First, iron powder and molybdenum oxide powder are mixed at a predetermined ratio. For the mixing, any applicable method (for example, a method using a Henschel mixer or a cone mixer) can be applied.
By holding a mixture of iron powder and auxiliary material powder at a high temperature and diffusing and bonding molybdenum (Mo) into the iron powder at the contact surface of the iron powder and molybdenum oxide powder, the secondary material adhesion seed coating of the present invention Iron powder is obtained.
As the atmosphere for the heat treatment, a reducing atmosphere is suitable, and a hydrogen-containing atmosphere, preferably a hydrogen atmosphere is particularly suitable. Note that heat treatment may be performed under vacuum. Moreover, the temperature of suitable heat processing is the range of 800-1000 degreeC. Note that molybdenum oxide is often reduced to metal Mo under such heat treatment conditions.
When the molybdenum oxide powder is diffused and adhered as an auxiliary material powder as in the above example, it is possible to add about 0.1% by weight of spindle oil etc. in order to improve the adhesion between the iron powder and molybdenum oxide. It is.

(Binder adhesion)
When carrying out the binder adhesion, the binder is not limited to a specific material, but examples of the binder include metal soaps such as zinc stearate and calcium stearate, amide waxes such as ethylene bisstearamide and stearic acid monoamide, PVA (polyvinyl chloride). Conventionally known binders such as alcohols), vinyl acetate copolymers, phenol resins and the like can be used.
These binders can be adhered to the surface of the iron powder by heating and melting to the melting point or higher (including the co-melting point), but the adhesion by the binder is not limited to this method. For example, a means may be used in which the binder component is dissolved in a solvent and applied to the iron powder and the auxiliary material powder to adhere both, and then the solvent is volatilized. In the case of using the above-mentioned binder such as metal soap, it is preferable to contain a binder having a melting point of about 80 to 150 ° C., and to heat the secondary material powder to a temperature higher than the melting point.

(Mechanical adhesion)
Mechanical adhesion is a method in which iron powder and secondary material powder are mixed with a mixer or the like, and the secondary material is adhered to the iron powder by using a collision pressure associated with contact between particles generated during the mixing.

There is no restriction | limiting in the method of coat | covering a seed using the iron powder for an auxiliary material adhesion seed coating.
For example, as shown in “Iron-coated direct sowing manual 2010 (Agricultural Research Institute for Agricultural and Food Industry Kinki Shikoku Agricultural Research Center)”, manual coating (coating), etc. Any method such as a method using a known mixer may be used.
As the mixer, for example, a stirring blade mixer (for example, a Henschel mixer) or a container rotation type mixer (for example, a V-type mixer, a double cone mixer, an inclined rotation type bread type mixer, a rotary mulberry type mixer, etc.) can be used. .
In addition, as shown in the iron coating direct sowing direct sowing manual 2010 described above, a coating reinforcing agent such as calcined gypsum can also be used for coating the iron powder for covering secondary material attached seeds.

[Embodiment 3]
This embodiment relates to an alloy steel powder for seed coating obtained by pre-alloying a secondary material to iron powder.
The inventor paid attention to a molybdenum compound as an auxiliary material pre-alloyed to iron powder. Molybdenum compounds (for example, molybdenum oxide) are known to have an action of suppressing the generation of sulfide ions that inhibit seed germination in the soil.
Therefore, the inventor examined how it is most effective to attach molybdenum to the seed when the seed is coated with the iron powder having a high anti-peeling effect as described above.

The auxiliary material such as molybdenum oxide is preferably present in the vicinity of the seed when the directly sown seed germinates from the viewpoint of enhancing the germination promotion effect. For this reason, it is preferable that the auxiliary material is previously attached to the seed.
By the way, when adhering the above-mentioned auxiliary material powder to the seed, for example, a method of adhering the auxiliary material powder after previously coating the seed with a binder such as PVA (polyvinyl alcohol) can be applied.
However, in such a method, there is a problem that a large variation is likely to occur in the adhesion rate of the secondary material between the seeds, particularly when a small amount of the secondary material is adhered.
Then, the inventor examined the method of making it adhere to a seed, without disperse | distributing a subsidiary material and without the dispersion | variation between seeds.
As a result, it was considered preferable to integrate the iron powder and the auxiliary material. Then, attention was paid to the fact that molybdenum can be alloyed with iron.
In other words, by alloying molybdenum with the above iron to produce alloy steel powder, molybdenum is uniformly dispersed in the alloy steel powder, and as a result, molybdenum is uniformly present on the surface of the rice seed together with iron. be able to. Thus, molybdenum can be effectively contributed to seed germination without being dissipated and without variation among seeds.
Molybdenum added as an alloying element is easily released in the soil as the iron is dissolved and dissolved, so that the effect of suppressing the germination inhibition mechanism can be exerted.

In the above examination, molybdenum oxide is taken as an example of the auxiliary material, but the same can be said if it is an element that contributes to seed germination and is essential for plant growth.
Examples of such auxiliary materials include manganese, copper, nickel, boron, and sulfur.

The alloy steel powder for seed coating of the present embodiment has been made based on the above examination, and is specifically shown below.
The alloy steel powder for seed coating according to the present embodiment is made of an alloy of iron and secondary materials, and the alloy steel powder for seed coating has a mass ratio of 0% for the alloy steel powder for seed coating having a particle diameter of 63 μm or less. The mass ratio of the alloy steel powder for seed coating with a particle diameter of more than 75% and a particle diameter of more than 63 μm and 150 μm or less is 25% or more and 100% or less, and the mass ratio of the alloy steel powder for seed coating with a particle diameter of more than 150 μm is It is characterized by being 0% or more and 50% or less.
Hereinafter, each configuration will be described in detail.

<Alloy steel powder for seed coating>
The reason why the mass ratio of the alloy steel powder for seed coating having a particle diameter of more than 63 μm and 150 μm or less is 25% or more is that the alloy steel powder for seed coating having a particle diameter of more than 63 μm and less than 150 μm is held by the hair on the seed surface. By including 25% or more of particles having such a particle size, retention by hair can be expected, and it is possible to realize a coating with less dropping of alloy steel powder for seed coating not only in the sowing process but also in the transport process. Because.
The mass ratio of the auxiliary material-attached seed coating iron powder having a particle diameter of more than 63 μm and 150 μm or less is preferably 30% or more, and more preferably 50% or more.

In addition, the mass ratio of the alloy steel powder for seed coating having a particle diameter of 63 μm or less was set to 75% or less. There is a possibility that seeds coated with alloy steel powder for seed coating may be damaged due to abrupt reaction with oxygen in the air, and may cause a fire when handling a large amount, and a fine seed coating alloy. This is because if the amount of steel powder attached is large, dust is easily generated and it is difficult to maintain a clean working environment.
The mass ratio of the secondary material-attached seed coating iron powder having a particle size of 63 μm or less is preferably 70% or less.

In addition, as a more preferable content of the alloy steel powder for seed coating having a particle size of 63 μm or less, the mass ratio of the alloy steel powder for seed coating having a particle size of 45 μm or less is 0% or more and 30% or less.
The alloy steel powder for seed coating having a particle diameter of 45 μm or less slips through the hairs on the seed surface and has a strong adhesive force directly adhering to the seed surface. A double coating is achieved.

  The reason why the mass ratio of the alloy steel powder for seed coating with a particle diameter exceeding 150 μm is 50% or less is that the alloy steel powder for seed coating with a particle diameter exceeding 150 μm is expected to be held by hair and directly attached to the seed surface. This is to reduce the particle size.

  The particle size distribution of the alloy steel powder for seed coating can be evaluated by sieving using the method defined in JIS Z2510-2004.

The alloy steel powder for seed coating is preferably atomized alloy steel powder produced by a so-called atomizing method. Atomized alloy steel powder is an alloy powder obtained by spraying molten steel with alloy components adjusted according to the purpose with water or gas. By dissolving molybdenum in molten steel, alloy steel powder in which molybdenum is uniformly dispersed in iron can be produced. The atomized alloy steel powder is usually heated in a reducing atmosphere (for example, a hydrogen atmosphere) after atomization to reduce C and O from the powder. However, it is also possible to use so-called “as-atomized” alloy powder that is not subjected to such heat treatment for the alloy powder as the raw material of the present invention.
As a method for producing alloy steel powder, a so-called reduction method, electrolysis method, pulverization or the like can be used as long as the components are suitable.

<Sub-material>
The auxiliary material is useful for seed germination and growth.
An example of the auxiliary material is molybdenum.
The action of molybdenum is as follows.
In the soil or on the soil surface, sulfate ions (SO ₄ ²⁻ ) are decomposed into sulfide ions (S ²⁻ ) and oxygen (O ₂ ) by the action of sulfate-reducing bacteria, and sulfide ions (S ² ) generated thereby. ^2- ) inhibits seed germination.
Molybdenum (Mo) becomes molybdate ions (MoO ₄ ²⁻ ) in the soil or on the soil surface, suppresses the decomposition of sulfate ions into sulfide ions, and prevents the generation of harmful sulfide ions.

By coating the seed using alloy steel powder in which the secondary material (molybdenum) is pre-alloyed, the secondary material (molybdenum) is uniformly dispersed on the surface of the seed as an element contained in the alloy steel powder.
When such seeds are directly sown, the secondary material (molybdenum) does not dissipate and acts effectively on seed germination. Moreover, since the dispersion | variation in the auxiliary material (molybdenum) adhesion rate between seeds is small, the dispersion | variation in germination and a growth can be suppressed.
Further, in the present embodiment, since molybdenum as an auxiliary material is alloyed with iron, molybdenum dissolves relatively slowly with iron. For this reason, the effect as a subsidiary material can be maintained for a long time.

  Also, since the molybdenum oxide powder is white, if white molybdenum oxide is attached to the surface of the seed by gluing or the like, the white is easy to find for birds, so it is easy for birds to eat directly sown seeds. In the case of the embodiment, the iron content of the seed-coated alloy steel powder coated with the seed is oxidized to exhibit a light brown-black color with low brightness, thereby making it difficult for birds to be found and the seed to be difficult to eat. There is also.

In addition, it is preferable that content of submaterials, such as molybdenum, shall be 0.01-100 mass parts with respect to 100 mass parts of iron. If it is 0.01 mass part or more, the effect of an auxiliary material mentioned above will be acquired. If the molybdenum content is 100 parts by mass or less, the iron powder constituting the alloy steel powder for seed coating is oxidized and the brightness is not increased and the white color is not close to white, and it cannot be eaten by birds.
Moreover, if a submaterial is 100 mass parts or less, the cost of the alloy steel powder for seed coating | cover will not become high.

There is no limitation on the method of coating the seed with the alloy steel powder for seed coating.
For example, as shown in “Iron-coated direct sowing manual 2010 (Agricultural Research Institute for Agricultural and Food Industry Kinki Shikoku Agricultural Research Center)”, manual coating (coating), etc. Any method such as a method using a known mixer may be used.
As the mixer, for example, a stirring blade mixer (for example, a Henschel mixer) or a container rotation type mixer (for example, a V-type mixer, a double cone mixer, an inclined rotation type bread type mixer, a rotary mulberry type mixer, etc.) can be used. .
Further, as shown in the iron coating submerged direct seeding manual 2010, a coating reinforcing agent such as calcined gypsum can be used for coating the alloy steel powder for seed coating.

[Example 1]
Inventive Example 1 in which molybdenum oxide is contained in iron powders having various particle size distributions as inventive examples in order to confirm the effect of preventing peeling of the secondary material-containing seed coating iron powder according to Embodiment 1 of the present invention. Rice seeds were coated using ~ 9. Moreover, as a comparative example, rice seeds were coated using Comparative Examples 1 to 4 which are iron powders having a particle size distribution outside the range of the particle size distribution of the present invention.
The molybdenum oxide-containing iron powder was coated (coated) according to the method described in the above-mentioned “Iron-coated direct sowing manual sowing manual 2010”. Specifically, it is as follows.

First, seed cake, calcined gypsum and several kinds of molybdenum oxide-containing iron powder were prepared. In addition, content of molybdenum oxide was 2 mass parts with respect to 100 mass parts of iron powder. The average particle diameter of the molybdenum oxide powder was 20 μm.
Next, using an inclined rotary bread mixer, while spraying an appropriate amount of water, 10 kg of seeds (seed seeds) and iron powder containing molybdenum oxide (5 kg of iron powder, 100 g of molybdenum oxide) and 0.5 kg of calcined gypsum And 0.25 kg of calcined gypsum was coated to finish.
A method for evaluating the strength of a coating film against rolling friction and sliding friction of seeds coated (coated) with molybdenum oxide-containing iron powder has not been established.
Therefore, the coating strength was investigated in accordance with the test method described in JPMA P 11-1992 “Method for measuring the Latra value of metal compact”. This test method will be referred to as a ratra test.

In the ratra test, 20 ± 0.05 g of seed coated with molybdenum oxide-containing iron powder was sealed in a rattle tester cage, and the cage was rotated 1000 times at a rotation speed of 87 ± 10 rpm. According to this method, rolling and sliding frictional forces are applied between the seeds and between the seeds and the inner surface of the basket container as the seeds flow while rolling in the basket.
Therefore, when this method is applied, the strength of the coating film when the rolling friction force and the sliding friction force are applied in combination can be evaluated.
Table 2 shows the particle size distribution of the molybdenum oxide-containing iron powder and the weight reduction rate in the ratra test. The weight reduction rate was obtained from the following calculation formula.
Weight reduction rate = (mass of coating peeled off in ratra test) / (mass of seed before test) × 100 (%)
Therefore, it can be determined that the smaller the weight reduction rate, the higher the strength of the coating.

As shown in Table 2, all of the examples described in Invention Examples 1 to 9 are “the mass ratio of the iron powder having a particle diameter of 63 μm or less is 0% or more and 75% or less, and the particle diameter is more than 63 μm and 150 μm or less. Is within the range of the particle size distribution of the present invention, wherein the mass ratio of the iron powder is 25% or more and 100% or less and the mass ratio of the iron powder having a particle diameter of more than 150 μm is 0% or more and 50% or less. The weight reduction rate is less than 4%.
On the other hand, in Comparative Examples 1 to 4 outside the above range of the particle size distribution, the weight reduction rate in the ratra test is 4% or more.
From this, it was demonstrated that the weight reduction rate can be significantly suppressed by making the particle size distribution of the iron powder in the molybdenum oxide-containing iron powder within the range of the present invention.
In Table 2, the numbers whose particle size distributions in Comparative Examples 1 to 4 are outside the scope of the present invention are underlined.

  In Invention Examples 1, 2, 3, 4, and 6, the mass ratio of the iron powder having a particle diameter of more than 63 μm and 150 μm or less is 50% or more and the mass ratio of the iron powder of 45 μm or less is 30% or less. Since the weight reduction rate in the ratra test is as low as 3.5% or less, the mass ratio of the iron powder having a particle diameter exceeding 63 μm and 150 μm or less is increased, and the iron powder having a particle diameter of 45 μm or less. It can be seen that the adhesion of the iron powder can be increased by reducing the mass ratio.

[Example 2]
In order to confirm the peeling-preventing effect of the iron powder for covering a secondary material attached seed according to Embodiment 2, Invention Examples 10 to 16 which are molybdenum attached iron powders having various particle size distributions are used as invention examples of the present invention. The rice seeds were coated. In addition, as a comparative example, rice seeds were coated using Comparative Examples 5 to 8, which are molybdenum-adhered iron powders having a particle size distribution outside the range of the particle size distribution of the present invention. The coating (coating) of the molybdenum-adhered iron powder was performed according to the method described in the aforementioned “Iron-coated direct sowing manual sowing manual 2010”. Specifically, it is as follows.

A predetermined ratio of MoO ₃ powder (average particle size 2.5 μm) was added to the as-atomized iron powder as an Mo compound powder, and mixed for 15 minutes in a V-type mixer. This mixed powder is heat-treated in a hydrogen atmosphere with a dew point of 25 ° C. (holding temperature: 900 ° C., holding time: 1 hour) to reduce the MoO ₃ powder to Mo metal powder, and to diffuse and adhere to the surface of the iron powder to adhere molybdenum. Iron powder was produced. The amount of molybdenum deposited was 2 parts by mass in terms of molybdenum oxide with respect to 100 parts by mass of iron powder.

In addition, MoO ₃ powder (average particle size 5 μm) is added as a Mo compound powder at a predetermined ratio to the iron powder produced by the water atomization method, and further 1.0 part by mass of stearic acid monoamide as a binder with respect to the iron powder. The mixture was added and mixed for 15 minutes while heating at 140 ° C. to prepare a powder in which a MoO ₃ powder was adhered to the surface of the iron powder. Incidentally, the adhesion amount of MoO ₃ was set to 2 parts by weight with respect to iron powder 100 parts by weight.

In addition, seed meal and calcined gypsum were prepared.
Next, 5 kg of the above-mentioned two kinds of molybdenum-adhered iron powder and 0.5 kg of calcined gypsum are coated on 10 kg of seeds (seeds) while spraying an appropriate amount of water using an inclined rotary type bread mixer. A finish of 0.25 kg calcined gypsum was coated.
A method for evaluating the strength of the coating film against rolling friction or sliding friction of seed coated with molybdenum-adhered iron powder has not been established.
Therefore, the coating strength was investigated in accordance with the test method described in JPMA P 11-1992 “Method for measuring the Latra value of metal compact”. This test method will be referred to as a ratra test.

In the ratra test, 20 ± 0.05 g of seed coated with molybdenum-adhered iron powder was enclosed in a cage of a ratra tester, and the cage was rotated 1000 times at a rotational speed of 87 ± 10 rpm. According to this method, rolling and sliding frictional forces are applied between the seeds and between the seeds and the inner surface of the basket container as the seeds flow while rolling in the basket.
Therefore, when this method is applied, the strength of the coating film when the rolling friction force and the sliding friction force are applied in combination can be evaluated.
Table 3 shows the particle size distribution of the molybdenum-attached iron powder and the weight reduction rate in the ratra test. The weight reduction rate was obtained from the following calculation formula.
Weight reduction rate = (mass of coating peeled off in ratra test) / (mass of seed before test) × 100 (%)
Therefore, it can be determined that the smaller the weight reduction rate, the higher the strength of the coating.

As shown in Table 3, all of the examples described in Invention Examples 10 to 16 are “the mass ratio of molybdenum-attached iron powder having a particle diameter of 63 μm or less is 0% to 75% and the particle diameter exceeds 63 μm. Within the range of the particle size distribution of the present invention, the mass ratio of molybdenum-attached iron powder of 150 μm or less is 25% or more and 100% or less, and the mass ratio of molybdenum-attached iron powder having a particle diameter of more than 150 μm is 0% or more and 50% or less. Yes, the weight loss rate in the Latra test is less than 4%.
On the other hand, in Comparative Examples 5 to 8 outside the range of the particle size distribution, the weight reduction rate in the ratra test is 4% or more.
From this, it was demonstrated that the weight reduction rate can be significantly suppressed by making the particle size distribution of the molybdenum-adhered iron powder within the range of the present invention.
In Table 3, the numbers whose particle size distributions in Comparative Examples 5 to 8 are outside the scope of the present invention are underlined.

  In Invention Examples 10, 11, and 12, the mass ratio of the molybdenum-adhered iron powder having a particle diameter of more than 63 μm and 150 μm or less is 50% or more and the mass ratio of the molybdenum-adhered iron powder of 45 μm or less is 30% or less. Since the weight reduction rate in the ratra test is as low as 3.5% or less, the mass ratio of the molybdenum-adhered iron powder having a particle diameter of more than 63 μm and 150 μm or less is increased, and the particle diameter is 45 μm or less. It turns out that the adhesive force of molybdenum adhesion iron powder can be heightened by reducing the mass ratio of molybdenum adhesion iron powder.

[Example 3]
In order to confirm the peeling prevention effect of the alloy steel powder for seed coating according to the third embodiment, the invention examples 17 to 23 which are molybdenum alloy steel powders having various particle size distributions are used as the invention examples of the present invention. Seed coating was performed. In addition, as a comparative example, rice seeds were coated using Comparative Examples 9 to 12, which are molybdenum alloy steel powders having a particle size distribution outside the range of the particle size distribution of the present invention. The coating (coating) of the molybdenum alloy steel powder was performed according to the method described in the above-mentioned “Iron coating direct sowing manual sowing manual 2010”. Specifically, it is as follows.

First, several kinds of molybdenum alloy steel powders prepared by seed seeds, calcined gypsum and water atomization method were prepared. In addition, content of molybdenum was 2 mass parts with respect to 100 mass parts of iron.
Next, using an inclined rotation type pan type mixer, while spraying an appropriate amount of water, 5 kg of molybdenum alloy steel powder and 0.5 kg of calcined gypsum are coated on 10 kg of seeds (seeds), and further 0.25 kg of The calcined gypsum was coated to the finish.
A method for evaluating the strength of the coating film against rolling friction and sliding friction of seeds coated (coated) with molybdenum alloy steel powder has not been established.
Therefore, the coating strength was investigated in accordance with the test method described in JPMA P 11-1992 “Method for measuring the Latra value of metal compact”. This test method will be referred to as a ratra test.

In the ratra test, 20 ± 0.05 g of seed coated with molybdenum alloy steel powder was enclosed in a cage of a ratra tester, and the cage was rotated 1000 times at a rotational speed of 87 ± 10 rpm. According to this method, rolling and sliding frictional forces are applied between the seeds and between the seeds and the inner surface of the basket container as the seeds flow while rolling in the basket.
Therefore, when this method is applied, the strength of the coating film when the rolling friction force and the sliding friction force are applied in combination can be evaluated.
Table 4 shows the particle size distribution of the molybdenum alloy steel powder and the weight reduction rate in the ratra test. The weight reduction rate was obtained from the following calculation formula.
Weight reduction rate = (mass of coating peeled off in ratra test) / (mass of seed before test) × 100 (%)
Therefore, it can be determined that the smaller the weight reduction rate, the higher the strength of the coating.

As shown in Table 4, all of the examples described in Invention Examples 17 to 23 are “the mass ratio of molybdenum alloy steel powder having a particle size of 63 μm or less is 0% to 75% and the particle size exceeds 63 μm. Within the range of the particle size distribution of the present invention, the mass ratio of molybdenum alloy steel powder of 150 μm or less is 25% or more and 100% or less, and the mass ratio of molybdenum alloy steel powder having a particle diameter of more than 150 μm is 0% or more and 50% or less. Yes, the weight loss rate in the Latra test is less than 4%.
On the other hand, in Comparative Examples 9 to 12 outside the range of the particle size distribution, the weight reduction rate in the ratra test is 4% or more.
From this, it was demonstrated that the weight reduction rate can be significantly suppressed by making the particle size distribution of the molybdenum alloy steel powder within the range of the present invention.
In Table 4, the numbers whose particle size distributions in Comparative Examples 1 to 4 are outside the scope of the present invention are underlined.

  In Invention Examples 17, 18, and 19, the mass ratio of the molybdenum alloy steel powder having a particle diameter of more than 63 μm and 150 μm or less is 50% or more and the mass ratio of the molybdenum alloy steel powder of 45 μm or less is 30% or less. Since the weight reduction rate in the ratra test is as low as 3.5% or less, the mass ratio of the molybdenum alloy steel powder having a particle diameter exceeding 63 μm and 150 μm or less is increased, and the particle diameter is 45 μm or less. It turns out that the adhesive force with respect to the seed of molybdenum alloy steel powder can be heightened by making the mass ratio of molybdenum alloy steel powder small.

1 seed rice 3 rice husk 5 hair

Claims (23)

Contains 0.01 to 100 parts by mass of auxiliary material powder with respect to 100 parts by mass of iron powder,
The iron powder has a mass ratio of iron powder having a particle diameter of 63 μm or less of 0% or more and 75% or less, and a mass ratio of iron powder having a particle diameter of more than 63 μm and 150 μm or less is 25% or more and 100% or less. The mass ratio of the iron powder having a diameter exceeding 150 μm is 0% or more and 50% or less,
A secondary material-containing iron powder for seed coating, wherein the secondary material powder has an average particle size of 45 μm or less.   The iron powder for seed coating containing an auxiliary material according to claim 1, wherein the auxiliary material is a simple molybdenum or a molybdenum compound.   The iron powder for seed coating containing an auxiliary material according to claim 1 or 2, wherein a mass ratio of the iron powder having a particle diameter of 45 µm or less is 0% or more and 30% or less.   The iron powder for seed coating according to any one of claims 1 to 3, wherein a mass ratio of the iron powder having a particle diameter of more than 63 µm and not more than 150 µm is 50% or more.   The iron powder for seed coating containing an auxiliary material according to any one of claims 1 to 4, wherein the iron powder is produced by a reduction method or an atomization method.   A seed obtained by coating a seed with the auxiliary material-containing iron powder for seed coating according to any one of claims 1 to 5.   The seed according to claim 6, wherein the seed is a rice seed. A secondary material adheres to the iron powder, and is a secondary material-attached seed coating iron powder used to coat the seed,
The iron powder for seed coating with a secondary material adhering to the secondary material has a mass ratio of 0% or more and 75% or less, and a particle diameter of more than 63 μm and 150 μm or less. A secondary material characterized in that the mass ratio of the iron powder for seed coating is 25% or more and 100% or less, and the mass ratio of the iron powder for seed coating with a particle diameter exceeding 150 μm is 0% or more and 50% or less. Iron powder for covering seeds.   9. The iron for adhering seeds to an auxiliary material according to claim 8, wherein the iron powder for adhering seeds to an auxiliary material is obtained by adhering 0.01 to 100 parts by mass of an auxiliary material to 100 parts by mass of iron powder. powder.   The secondary material-attached seed coating iron powder according to claim 8 or 9, wherein the secondary material is a single element of molybdenum or a molybdenum compound.   The iron powder for covering secondary material-attached seeds has a mass ratio of 0% or more and 30% or less of secondary powder-attached seed-covering iron powder having a particle size of 45 µm or less. The iron powder for covering seeds with auxiliary materials according to one item.   The secondary material-attached seed coating material according to any one of claims 8 to 11, wherein a mass ratio of the iron powder for secondary material-attached seed coating having a particle diameter of more than 63 µm and 150 µm or less is 50% or more. Iron powder.   The iron powder for covering a secondary material attached seed according to any one of claims 8 to 12, wherein the iron powder is produced by a reduction method or an atomization method.   A seed obtained by coating a seed with the iron powder for coating a secondary material adhering seed according to any one of claims 8 to 13.   The seed according to claim 14, wherein the seed is a rice seed. It consists of an alloy of iron and secondary materials, and is an alloy steel powder for seed coating used to coat seeds,
The alloy steel powder for seed coating is an alloy steel powder for seed coating having a mass ratio of 0% to 75% and a particle diameter of more than 63 μm and 150 μm or less. An alloy steel powder for seed coating, wherein the mass ratio of the alloy steel powder for seed coating with a mass ratio of 25% to 100% and a particle diameter of more than 150 μm is 0% to 50%.   The alloy steel powder for seed coating according to claim 16, wherein the alloy steel powder for seed coating contains 0.01 to 100 parts by mass of an auxiliary material with respect to 100 parts by mass of iron.   The alloy steel powder for seed coating according to claim 16 or 17, wherein the auxiliary material is molybdenum.   19. The seed coating alloy steel powder according to claim 16, wherein a mass ratio of the seed coating alloy steel powder having a particle diameter of 45 μm or less is 0% or more and 30% or less. Alloy steel powder for seed coating.   The alloy steel powder for seed coating according to any one of claims 16 to 19, wherein a mass ratio of the alloy steel powder for seed coating having a particle diameter of more than 63 µm and not more than 150 µm is 50% or more.   The alloy steel powder for seed coating according to any one of claims 16 to 20, wherein the alloy steel powder for seed coating is manufactured by a reduction method or an atomization method.   A seed obtained by coating a seed with the alloy steel powder for seed coating according to any one of claims 16 to 21. The seed according to claim 22, wherein the seed is a rice seed.

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