JP2585959B2 - Precast cement product composition for construction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is used as an exterior material, a floor material, a wall material, a soundproof wall, a decorative panel, a protective wall, a PC board with a tile tip, a fireproof covering material, and a driving form in the civil engineering and construction fields. In some cases, the present invention relates to a precast cement product composition for construction that provides a material having excellent strength (bending, compression), adhesive strength, and weather resistance.

[0002]

2. Description of the Related Art It is well known that silica materials such as fly ash, blast furnace slag and silica fume are used as admixtures for cement in order to improve various properties such as strength and weather resistance of hardened cementitious materials. Numerous proposals have been made for cement compositions containing such silica materials. For example, a cement composition for watertight concrete comprising a mixture of cement / classified fly ash / silica fume / water reducing agent (JP-A-4-2642), a cement having a particle size of 0.5 to 100 μm and a particle size of 0.
Particles of silica dust or the like having a particle size of 0.1 to 0.5 μm
Hydraulic composite material to which particles such as white clay having a size of about 15 μm are added (Japanese Patent Application Laid-Open No. 2-102152), and a composite binder for concrete comprising a mixture of cement / classified fly ash / blast furnace slag (Japanese Patent Application Laid-Open No. 4-2644) ), Fly ash mortar composed of a mixture of cemet / classified fly ash / fine aggregate (JP-A-3-126652), and a cement composition composed of a cement / organic fiber / classified fly ash / light-weight fine aggregate mixture (JP-A-3-3). −29
No. 5843), a cement composition comprising a cement / type II anhydrous gypsum / pozzolanic substance mixture (JP-A-3-409)
No. 47 gazette).

Further, cement-based self-leveling flooring materials comprising cement / lime-based expanding material / sulfonated modified resin of melamine formaldehyde condensate (water reducing agent) / fly ash / water retaining agent / sand mixture (Japanese Patent Application Laid-Open No. 56-84358)
Gazette), a gypsum-based cast flooring composition composed of a type II anhydrous gypsum / Portland cement / fly ash mixture (Japanese Unexamined Patent Publication (Kokai) No. 61-266340), and a cement-based thin-walled casting mold containing melamine resin. High-strength products such as building members (JP-A-3-12180, JP-A-3-28
8605, JP-A-3-293473, JP-A-4-5
9646 publications) and the like have also been proposed.

[0004] Further, crack prevention of hardened cementitious materials,
There is known a method of using a polymer latex as an additive for improving durability such as water resistance, abrasion resistance, chemical resistance, and prevention of neutralization (Japanese Patent Application Laid-Open No. 53-84024). However, according to this method, although the properties of the cured product can be improved to a certain extent, water resistance, neutralization and the like are insufficient in efficacy, and the inventors of the present invention also have an earlier average particle diameter. 300 nm or less, a compounding agent for a hydraulic inorganic material having an aqueous emulsion having a cross-linked structure and a polymer having a sulfonic acid group as essential components (JP-A-2-141451), having a core-shell type heterostratified structure The weight ratio of the unsaturated monomer constituting the core part and the shell part is 90/10
A compounding agent for cement mortar and / or concrete containing a polymer latex composed of 10/90 alkyl acrylate copolymer fine particles as an essential component
No. 205333) and a compounding agent for cement mortar and / or concrete containing an unsaturated sulfonic acid / unsaturated carboxylic acid (salt) copolymer latex as an essential component (JP-A-3-257047).

However, most of the cured products obtained from the above-mentioned cement compositions have a problem that gloss is poor due to the rough surface, and this is particularly important in the case of stone materials. Thus, the present inventors have made a hydraulic inorganic material / silica admixture / acrylic water-dispersible resin / fine aggregate / pigment having a specific compounding ratio capable of forming a dense and smooth surface. Stone composition (Japanese Patent Application 4-
89376).

[0006]

However, the cured product obtained from the above stone composition has a dense and smooth surface,
As a result, the product was excellent in gloss and excellent in chemical resistance, water resistance and weather resistance, but was not yet satisfactory in terms of strength as a precast cement product for construction. Furthermore, a cast having a sufficient strength could not be obtained by the casting method.

Accordingly, an object of the present invention is to provide a precast cement product composition for construction from which a cured product having excellent strength (flexural strength, compressive strength, adhesive strength) can be easily obtained.

[0008]

According to the present invention, (a)
Hydraulic inorganic material, (b) siliceous admixture, (c) micropolymer emulsion having an average particle diameter of 20 to 1,000 nm, (d) fine aggregate, (e) aromatic aminosulfonic acid-based water reducing agent, (f A) / (b) / (c) / (d) / (e) /
(F) / (g) = 100/3 to 12 / 0.5 to 5 (solid content conversion) / 80 to 220 / 0.25 to 1.8 (solid content conversion) / 0 to 5/25 to 35 ( (Weight ratio) is provided.

More specifically, the precast cement product composition for construction according to the present invention comprises a composition having a specific composition comprising a hydraulic inorganic material, a siliceous admixture, a fine aggregate and a pigment, and further having an average particle diameter of 20 to 1,000 nm. Since the micropolymer emulsion and the aromatic aminosulfonic acid-based water reducing agent were blended in a certain amount range, the hydraulic inorganic material was uniformly dispersed,
Furthermore, since the surface of the cured product is densified by the ultrafine polymer, a cured product having significantly improved strength can be formed. Also, by using the ultrafine polymer and the aromatic aminosulfonic acid-based water reducing agent in combination, it became possible to produce a cured product by a casting method.

Hereinafter, the precast cement product composition for construction of the present invention will be described in detail. The hydraulic inorganic material used in the present invention is cement such as Portland cement, fly ash cement, silica cement, blast furnace cement and the like, and gypsum such as hemihydrate, dihydrate and hexahydrate gypsum.

The siliceous admixture used in the present invention includes:
A known siliceous admixture generally used as a cement admixture is arbitrarily selected and used. For example, silica fume, fly ash, clay, sludge slag, aluminum slag, blast furnace slag, rice husk ash, volcanic ash (natural pozzolan) and the like can be mentioned, among which silica fium is preferable. Silica fume is amorphous SiO ₂ by-produced during the production of ferrosilicon or metallic silicon.
It is an ultra-fine powder containing as a main component, the dispersibility of the hydraulic inorganic material and silica fume is improved, and from the viewpoint of smoothing the surface of the cured product, it is particularly preferable to use silica fume having an average particle diameter of 1 to 20 μm. preferable. (Even in the case of other siliceous admixtures, those having an average particle diameter of about 1 to 20 μm are also preferable.)

The amount of the siliceous admixture used in the composition of the present invention is 3 to 12 parts by weight based on 100 parts by weight of the hydraulic inorganic material. If the amount is less than 3 parts by weight, the effect of densification and smoothness improvement on the surface of the obtained cured product will be reduced, and if it exceeds 12 parts by weight, the curing speed will be slow or the strength of the cured product will be reduced. The problem occurs.

The composition of the present invention has an average particle size of 20 to
A 1,000 nm micropolymer emulsion is formulated. Examples of the micropolymer emulsion include an acrylic micropolymer emulsion (acrylic copolymer emulsion) and an ethylene / vinyl acetate copolymer emulsion, and an acrylic copolymer emulsion is particularly preferred. Acrylic copolymer emulsion is
It can be obtained by emulsion polymerization of acrylic monomers such as (meth) acrylic acid and (meth) acrylic acid ester. As the acrylic monomer in this case, an acrylate ester having an ethylenic double bond (for example,
Ethyl acrylate, butyl acrylate, octyl acrylate, 2-ethylhexyl acrylate), methacrylic esters (eg, methyl methacrylate, ethyl methacrylate, butyl methacrylate, octyl methacrylate) and the like. One of these (meth) acrylates may be used alone, or two or more thereof may be used in combination.

In order to improve the dispersibility of the hydraulic inorganic material, a material obtained by copolymerizing an unsaturated monomer having a carboxyl group and an ethylenic double bond in the molecule is more preferably used. Examples of the unsaturated monomer having a carboxyl group and an ethylenic double bond in the molecule include acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid and half esters, half amides or These salts may be mentioned, but it is particularly preferable to copolymerize methacrylic acid at 0.1 to 5% by weight. Further, an unsaturated monomer having a sulfonic acid group and an ethylenic double bond in the molecule may be copolymerized.
Furthermore, you may use together with the said carboxyl group containing monomer. Specific examples of the sulfonic acid group monomer include styrene sulfonic acid, α-methylstyrene sulfonic acid and salts thereof, 2-acrylamido-2-methylpropanesulfonic acid, and 2-methacrylamido-2-methylpropanesulfonic acid. And 2-acrylamidobutanesulfonic acid, 2-acrylamidobutane-2-sulfonic acid and salts thereof, and vinylsulfonic acids and sulfonic acid monomers such as salts thereof. Preferably, styrenesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid or a salt thereof is used. The amount of these used is generally 0.1 to 40.0% by weight based on the total amount of monomers excluding the reactive monomer.

Further, in order to improve strength and water resistance, it is preferable to copolymerize a crosslinking agent having a plurality of functional groups in one molecule and / or a reactive unsaturated monomer. As these crosslinking agents and reactive unsaturated monomers, trimethylolpropane triacrylate, glycidyl acrylate,
Glycidyl methacrylate, bisphenol A polyoxyethylene adduct di (meth) acrylate, triallyl isocyanurate, N-methylol acrylamide, etc., are 0.1 to 5% by weight based on the unsaturated monomer.
It is preferable to use it after copolymerization.

Further, in the present invention, non-acrylic monomers, for example, styrenes such as styrene and α-methylstyrene, and dienes such as butadiene and isoprene, as long as the performance of the acrylic copolymer emulsion is not impaired. And vinyl esters such as vinyl acetate and vinyl propionate, and nitriles such as acrylonitrile and α-methylacrylonitrile.

The acrylic copolymer emulsion most preferably used in the present invention has a core-shell type heterostratified structure, and the weight ratio of the unsaturated monomer constituting the core portion and the shell portion is 35/35. The polymer is composed of polymer fine particles of 65 to 90/10, and the weight composition of the unsaturated monomer in the core portion is such that the alkyl group has 1 to 8 carbon atoms.55 to 100% by weight acrylic acid alkyl ester alkyl group carbon number Is 1 to 4, 0 to 45% by weight of an alkyl methacrylate ethylenically unsaturated carboxylic acid or / and 0 to 10% by weight of ethylenically unsaturated sulfonic acid or a salt thereof, and 0 to 5% by weight of a crosslinking agent, The weight composition of the unsaturated monomer in the shell portion is such that the alkyl group has 1 to 8 carbon atoms 5 to 49.9% by weight Acrylic acid alkyl ester The alkyl group has 1 to 4 carbon atoms 45 to 90% by weight methacrylic acid Alkyl ester ethylenically unsaturated The essential component is ribonic acid and / or ethylenic 0.1 to 10% by weight unsaturated sulfonic acid or its salt crosslinking agent 0 to 5% by weight.

Unsaturated monomers mainly used for the core are ethyl acrylate, butyl acrylate, octyl acrylate, and 2-ethylhexyl acrylate, particularly preferably ethyl acrylate, butyl acrylate, and acrylate. 2-Ethylhexyl is used. Unsaturated monomers mainly used for the shell part are methyl methacrylate, ethyl methacrylate, butyl methacrylate,
Particularly preferably, methyl methacrylate is used.

In order to improve the dispersibility of the cement, the core and the shell are more preferably copolymerized with an unsaturated monomer having a carboxyl group and an ethylenic double bond in the molecule. used. Examples of the unsaturated monomer having a carboxyl group and an ethylenic double bond in the molecule include acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid and half esters, half amides or These salts and the like can be mentioned. These unsaturated monomers are preferably copolymerized at 0.1 to 5% by weight with respect to the unsaturated monomer in the core or shell, but methacrylic acid is not used in the core, 0.1 to the unsaturated monomer of the shell portion
It is particularly preferable to copolymerize 5% by weight. Also,
An unsaturated monomer having a sulfonic acid group and an ethylenic double bond in the molecule may be copolymerized. Furthermore, you may use together with the said carboxyl group containing monomer. Specific examples of the sulfonic acid group monomer include styrene sulfonic acid,
α-methylstyrenesulfonic acid and salts thereof,
Acrylamide-2-methylpropanesulfonic acid, 2-
Methacrylamide-2-methylpropanesulfonic acid, 2
Sulfonic acid monomers such as -acrylamidobutanesulfonic acid, 2-acrylamidobutane-2-sulfonic acid and salts thereof, and vinylsulfonic acid and salts thereof. Preferably, styrenesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid or a salt thereof is used. The amount of these used is generally 0.1 to 40.0 with respect to the total amount of monomers excluding the reactive monomer.
% By weight.

Further, in order to improve the strength and the water resistance of the core and the shell, it is preferable to copolymerize a crosslinking agent having a plurality of functional groups in one molecule. These crosslinkers include trimethylolpropane triacrylate,
Glycidyl acrylate, glycidyl methacrylate,
Bisphenol A polyoxyethylene adduct di (meth)
Acrylate, triallyl isocyanurate, N-methylol acrylamide and the like can be mentioned. Trimethylolpropane triacrylate is used by copolymerizing 0.1 to 5% by weight with respect to the unsaturated monomer in the core and / or shell. Is preferred.

The following anionic and nonionic emulsifiers are used as the emulsifier for emulsion polymerization of the acrylic copolymer emulsion used in the present invention.

[Representative Examples of Anionic Emulsifier] (1) Polyoxyalkylene alkylaryl ether sulfonate sulfate salt

Embedded imageR₁: C₆~₂₀Alkyl group n: 0-100, preferably 5-40 M₁Monovalent or divalent cation (2) polyoxyalkylene alkyl ether sulfate
Salt

Embedded image R ₁ —O— (AO) n—SO ₃ M ₁ (wherein R ₁ , A, n and M ₁ are the same as described above) (3) Polyoxyethylene alkyl aryl ether sulfate salt

Embedded image (Wherein, R ₁ , A, n and M ₁ are the same as above)

Embedded image M₁, A, n: Same as above R_Two: Hydrogen atom or methyl group R_Three: C₁~ C₃₀Alkyl, alkenyl or alkyl
Phenyl group having a phenyl or alkenyl group, fatty acid
residue

Embedded image (In the formula, M ₁ , A, n, R ₂ and R ₃ are the same as described above.)

Embedded image (Where M₁, A, n, R_TwoAnd R_ThreeIs the same as above)

Embedded image (Where M₁, A, n, R_TwoAnd R_ThreeIs the same as above)

Embedded image (Where M₁, A, n, R_TwoAnd R_ThreeIs the same as above m: 0,1 R_Four: -CH_Two-, -CH_TwoCH_Two-Or phenylene group)

Embedded image (M ₁ , A, n, m, R ₂ , R ₃ and R ₄ are the same as above)

[Typical examples of nonionic emulsifiers]

Embedded image (10) Polyoxyalkylene alkyl aryl ether (In the formula, p is 0 to 100, preferably 5 to 70, and R ₂ and A are the same as described above.)

(11) Polyoxyalkylene alkyl ether R ₁ -O- (AO) pH (wherein R ₁ , A and p are the same as above)

These anionic emulsifiers and nonionic emulsifiers can be used alone or in combination of two or more, but it is preferable to use one or more emulsifiers having an ethylene oxide and propylene oxide group in the molecule. More preferably, the compound of the above (1) as an anionic emulsifier and the above (1) as a nonionic emulsifier
It is desirable to use one or more compounds of 0) or (11). These emulsifiers are used in an amount of 0.5
It is good to use in the range of 15 to 15% by weight, preferably 1 to 10% by weight.

Examples of the polymerization initiator include hydrogen peroxide alone or a combination of hydrogen peroxide and a carboxylic acid such as tartaric acid, citric acid, and ascorbic acid, or hydrogen peroxide and oxalic acid, sulfinic acid, and salts or oxyacids thereof. Combinations with aldehydes, water-soluble iron salts, etc., as well as peroxides such as persulfates, percarbonates, perborates, and 2,2'-azobis (2-aminodipropane) and salts thereof, 2'-azobis (N, N'-dimethylene-isobutylamidine)
And its salts, and water-soluble azo initiators such as 4,4'-azobis (4-cyanovaleric acid) and its salts. For the preparation of the acrylic water-dispersible resin used in the present invention, it is preferable to use the above water-soluble azo initiator in an amount of 0.1 to 3% by weight of the unsaturated monomer mixture.

The acrylic copolymer emulsion used in the present invention can be prepared by the following general emulsion polymerization method using the above unsaturated monomer, emulsifier, and polymerization initiator. That is, after dissolving the emulsifier in the aqueous phase and solubilizing a part of the core unsaturated monomer, a polymerization initiator is added, and then the core unsaturated monomer and the shell unsaturated monomer are added. Emulsion polymerization can be prepared by any of the following methods: a monomer dropping method in which the monomer is dropped in order, or an emulsifier, a part of water, and a pre-emulsion method in which an unsaturated monomer is previously mixed and emulsified and dropped. The use of a pre-emulsification method is more preferable in order to reduce the amount of polymer adhered to a certain polymerization vessel or a stirring blade. In particular, when producing an acrylic water-dispersible resin having a core-shell type heterostratified structure, a point to be noted is that the polymerization of the core part and the polymerization of the shell part become block-type bonds, and therefore, the core After the completion of the polymerization, the aging is preferably performed for several minutes to several hours. The acrylic copolymer emulsion used in the present invention has a viscosity of 10 to 1000 cp (Brookfield viscometer) at a solid content of 40% by weight, and has good workability. Can be contained in an amount of 50% or more.

Further, these acrylic copolymer emulsions used in the present invention have an average particle diameter of 20 to 1,
It is desirable that the thickness be 000 nm, preferably 500 nm or less, more preferably 200 nm or less. 1,00
If it exceeds 0 nm, the effect of improving the strength and weather resistance of the cured product is often insufficient.

The acrylic copolymer emulsion used in the composition of the present invention can be easily obtained by emulsion polymerization as described above, but can be incorporated into the composition in the form of the obtained emulsion. In this case, the amount of the resin used is 0.5 to 5 parts by weight as a solid content based on 100 parts by weight of the hydraulic inorganic material. If the amount is less than 0.5 part by weight, the obtained cured product will have poor weather resistance. Conversely, if it exceeds 5 parts by weight, the bending strength and the compressive strength decrease.

In the present invention, fine aggregate is used to increase the strength of the cured product. As fine aggregate, sand, silica sand,
Gravel, mica, natural stone powder, glass powder and the like can be used.
Fine aggregate is 80 to 2 parts per 100 parts by weight of hydraulic inorganic material.
It is preferable to use 20 parts by weight. If the amount is less than 80 parts by weight, the cured body will be distorted and the compression bending strength will be weak, and if it exceeds 220 parts by weight, the strength of the cured body will be weak.

In the present invention, it is also possible to use a pigment. Various natural pigments, inorganic pigments, and organic pigments can be used as the pigment. The pigment is preferably used in an amount of 0 to 5 parts by weight based on 100 parts by weight of the hydraulic inorganic material. Also, 5
Exceeding parts by weight is disadvantageous in terms of cost.

In the present invention, the water content in the composition must be 25 to 35 parts by weight based on 100 parts by weight of the hydraulic inorganic material. If the amount is less than 25 parts by weight, the fluidity is reduced and pouring becomes impossible. On the other hand, if the amount exceeds 35 parts by weight, the strength of the cured product becomes weak.

In the present invention, an aromatic aminosulfonic acid-based water reducing agent is blended. By the addition of the water reducing agent, a great improvement in the strength of the cured product is achieved. Examples of the aromatic aminosulfonic acid-based water reducing agent include Barik series manufactured by Fujisawa Pharmaceutical Co., Ltd.
This water reducing agent is desirably incorporated at the time of mixing and kneading the hydraulic inorganic material and the micropolymer emulsion, but may be incorporated in the polymer emulsion in advance. The amount of the water reducing agent is 0.25 to 1.8 parts by weight in terms of solid content based on 100 parts by weight of the hydraulic inorganic material. If the amount is less than 0.25 parts by weight, the water reducing effect is insufficient, while if it exceeds 1.8 parts by weight, the curing time is prolonged, and the aggregates are separated.

In the present invention, a surfactant may be used to enhance the binding between the siliceous admixture and the hydraulic inorganic material. . Examples of the surfactant include an alkylbenzene sulfonate (an alkyl group having 12 to 1 carbon atoms).
8), alkyl (C ₁₂ -C ₁₈₎ sulfuric acid ester salts, alkyl phenyl sulfates, polyoxyethylene alkyl phenyl sulfates, dialkyl (C ₈ -C ₁₄₎
Sulfosuccinic acid ester salts, alkyl (C ₈ ~C ₁₄₎ sulfosuccinic acid monoamide, polyoxyethylene (EO:
P = 1-50) nonylphenyl ether, C ₁₂ -C ₁₈ fatty acid alkylolamide, polyoxyethylene (EO:
P = 1 to 50) alkyl amine, polyoxyethylene (EO: P = 2~100) alkyl diamines, fatty amides, dialkyl (C ₁₂ ~C ₁₈₎ dimethyl quaternary ammonium chloride, mono-alkyl (C ₁₂ ~C ₁₈₎ Trimethyl quaternary ammonium chloride, alkylamine salts and the like.

Further, in the present invention, conventional additives such as an air entraining agent, a water retention agent, an antifoaming agent, an alkali agent and the like can be further added. In this case, examples of the air entraining agent include sodium ligninsulfonate, sodium resinate, amine salts of alkylaryl sulfonates, polyoxyethylene alkylphenyl sulfates, and polyoxyethylene alkyl sulfates.

The composition of the present invention comprises a hydraulic inorganic material, a siliceous admixture and a micropolymer emulsion,
It can be obtained by mixing the fine aggregate, the aromatic aminosulfonic acid-based water reducing agent, and, if necessary, the pigment and other optional components with water by an optional method.

In order to obtain a cured product from the composition of the present invention, the composition is poured into an appropriate mold and molded (cast molding).
It is manufactured by doing. The composition has good flowability and can be cast and molded, and the surface of the cured product is densified by the micropolymer. Therefore, according to the composition, the strength (bending strength, compression strength, adhesive strength) is obtained. A cured product having greatly improved As a result, the thickness of the structure or the structure plate can be reduced to half, and the weight of the structure can be reduced. Therefore, the present composition can be poured into a mold having a complicated and thin shape to produce a driving mold having a complex and thin shape, and the present composition can be poured into a mold having a thin shape and have a thin shape. Shaped exterior materials, floor materials, wall materials, soundproof walls, decorative boards, protective walls, tiled PC boards, fireproof coating materials, and the like can be manufactured. In this case, it is also effective to apply the release agent thinly and uniformly on the mold. Release agents include silicone-based release agents, Teflon-based release agents, fatty acids,
Nonionic surfactants, anionic surfactants, cationic surfactants and the like can be mentioned.

In order to obtain a cured product, the composition of the present invention is sufficiently stirred, then poured into a mold and cured. Curing is performed under normal pressure. Curing temperature is 5 to 70 ° C, preferably 10 to 70 ° C.
The temperature is in the range of 60 ° C., and the curing time is usually in the range of 1 to 240 hours.

From the precast cement product composition for construction of the present invention, a cured product having excellent strength and weather resistance can be obtained. Therefore, the composition of the present invention can be used for exterior materials, flooring materials, and wall materials in the field of civil engineering and construction. , Soundproof wall, plaque, support wall, PC with tile tip
It is useful as a board, a refractory coating, a driving form, and the like.

[0039]

The present invention will now be described more specifically with reference to examples and comparative examples. The parts and percentages shown below are based on weight.

Examples 1 to 10 and Comparative Examples 1 to 6 In accordance with JIS A6203, a composition shown in Table 3 [Portland cement (normal,
And then kneading for 60 seconds, then adding water and an acrylic water-dispersed emulsion shown in Table 1 (the emulsifier used is shown in Table 2) and kneading for 120 seconds. did. The mortar was poured into a container to prepare a cured product of 40 × 40 × 160 mm. After demolding, curing was carried out at 20 ° C. and 60% for 24 hours. The bending strength, compression strength, and adhesive strength of the completed cured product were measured in accordance with JIS A6203. Table 3 shows the results.

The following compositions were used. Cement: Fuji Cement made by Mitsubishi Materials Corporation, Early-strength cement made by Chichibu Cement Co., Ltd. Silica Hyum: Made by Elchem Japan Ltd. Sand: 2.5 mm under sand near Sagami River Pigment: Bayferox made by Bayer Japan Ltd. Yellow Water reducing agent: Aromatic aminosulfonic acid compound manufactured by Fujisawa Pharmaceutical Co., Ltd., "BARIC FP-1790"

[0042]

[Table 1] Acrylic water-dispersed emulsion

[0043]

[Table 2] Emulsifier for water-based acrylic emulsion

[0044]

[Table 3]

[0045]

The precast cement product composition for construction according to the first aspect of the present invention comprises a composition having a specific composition comprising a hydraulic inorganic material, a siliceous admixture, a fine aggregate, a pigment and water, and an average particle diameter of 20 to 50%. Since a certain amount of a 1,000 nm micropolymer emulsion and an aromatic aminosulfonic acid-based water reducing agent are blended, the dispersibility of the hydraulic inorganic material particles and the siliceous admixture particles is improved, and the ultrafine polymer particles are further improved. The fluidity at the time of kneading is improved by the bearing effect of kneading, the ratio of water / hydraulic inorganic material can be kept low, and the surface of the cured product is densified by the polymer. (Bending strength, compression strength, adhesive strength)
A cured product having greatly improved As a result, the thickness of the structure or the structure plate can be reduced to half, and the weight of the structure can be reduced.

According to the precast cement product composition for construction of claim 2, since an acrylic copolymer emulsion is used as the micropolymer emulsion, a cured product excellent in chemical resistance, water resistance and weather resistance can be obtained. Adds effect.

In the precast cement product composition for construction according to the third aspect, since a crosslinked emulsion is used as the acrylic copolymer emulsion, an effect of obtaining a cured product having further improved strength is added.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location C04B 24:22) 111: 27 (72) Inventor Atsushi Ito 1-3-7 Honjo, Sumida-ku, Tokyo Inside ON Co., Ltd. (72) Inventor Hiroshi Morita 1-3-7 Honjo, Sumida-ku, Tokyo Inside Lion Co., Ltd. (56) References JP-A-3-293473 (JP, A) JP-A-4-59646 JP-A-53-84024 (JP, A) JP-A-2-141451 (JP, A) JP-A-3-288605 (JP, A) JP-A-3-205333 (JP, A) Unexamined Japanese Patent Publication No. Hei 3-257047 (JP, A)

Claims (3)

(57) [Claims] 1. A hydraulic inorganic material, (b) a siliceous admixture, (c) a micropolymer emulsion having an average particle diameter of 20 to 1,000 nm, (d) fine aggregate, (e) aromatic amino It consists of a sulfonic acid-based water reducing agent, (f) a pigment and (g) water, and the mixing ratio thereof is (a) / (b) / (c) /
(D) / (e) / (f) / (g) = 100/3 to 12 /
0.5-5 (solid content conversion) /80-220/0.25-
1.8 (solid content conversion) / 0-5 / 25-35 (weight ratio)
A precast cement product composition for construction, characterized in that: 2. The precast cement product composition for construction according to claim 1, wherein the micropolymer emulsion is an acrylic micropolymer emulsion obtained by emulsion polymerization of an acrylic monomer. 3. The precast cement product composition for construction according to claim 2, wherein the micropolymer emulsion is a crosslinked micropolymer emulsion containing acrylic acid and an acrylate ester as essential components.