JP5442552B2 - Resin material and manufacturing method thereof - Google Patents

Description

  The present invention relates to a resin material and a method for producing the same, and in particular, relates to a novel resin material that has been completely recycled from a used olefin-based synthetic resin material and a used gypsum board, and a method for producing the same. Is.

Conventionally, it is well known that there is a need to recycle gypsum board as industrial waste.
However, in general, although it is known that recycling of industrial waste is good for the environment, it is unacceptable to the industry if the cost required for actual recycling is high.

By the way, the gypsum board is a plate in which gypsum as a main raw material is coated with paper.
Gypsum board is economical, durable, heat-insulating, and sound-insulating, and is widely used as a building material. The production volume exceeds 5 million tons per year.
Therefore, the amount of gypsum board discarded exceeds 1.7 million tons per year. Almost 100% of waste gypsum board generated during production is recycled, but about 38% of waste gypsum board generated during construction Although it is recycled, the waste gypsum board that is generated when the building is demolished has a low recycling rate and is currently landfilled at the final disposal site.

Therefore, it is necessary to develop an effective recycling process for such gypsum board.
On the other hand, as other industrial wastes, polypropylene and polyethylene used as packaging materials and olefin synthetic resin products used in plastic containers for general waste are known, and such used olefin synthetic resin products are known. Regarding the reuse, the necessity is recognized, but there is a problem of cost, and an efficient recycling method has not yet been realized.

  However, since the olefin synthetic resin is inexpensive and has good moldability, it has a feature that it has a large circulation amount as a raw material for recycling and is easily available as a recycled material, but it is very soft when heated during molding. Therefore, when performing profile extrusion, it is necessary to mold by adjusting the hardness. In addition, there is an object of increasing the rigidity of the olefin plastic, and therefore, the hardness is adjusted by blending powder talc or the like obtained by collecting and grinding an ore called talc.

The blending ratio of such talc is usually 10% to 60% with respect to the weight of the olefin resin, and is a blending material occupying a considerable weight.
Therefore, attempts have been made in the past to use the gypsum board of construction waste as a substitute for talc to adjust the hardness during melt molding of the olefin resin, but it ended without success. Yes.

Examining the cause, one of the reasons is that the gypsum board has durability, and there is 20% or more of water originally included as crystal water contained in gypsum.
On the other hand, the water content of talc mixed with ordinary plastics is specified to be almost 0%. The reason for this is that talc having a water content is contained in an olefin-based resin heated and melted at a high temperature. This is because, when mixed, the water containing the water evaporates and the plastic foams during molding, causing a decrease in strength of the molded resin.

Therefore, the gypsum of the gypsum board contains 20% of water, so it is obvious that it cannot be used as an aggregate of olefin resin.
And as another reason, the gypsum board is composed of gypsum and paper, and even if the moisture content of gypsum can be eliminated, the separation of gypsum and paper is a precondition, and this separation process is not easy. Therefore, it is necessary to input extra energy.

For the above reasons, a method of using gypsum board as an aggregate in recycling of olefin-based resin has not been realized.
On the other hand, regarding a method for producing a molded body in which an undried filler is mixed with an olefin-based resin to form a foaming agent and is attached to the surface of a metal substrate or the like, for example, JP 2008-81648 A (Patent Document 1). However, there is no known example regarding the technology of mixing the gypsum board itself into the olefin resin as a filler.

JP 2008-81648 A

  Accordingly, an object of the present invention is to provide a used gypsum board as a building waste material that is currently discharged in large quantities as industrial waste, and a used olefin resin molding represented by PET bottles that are also discharged in large quantities as industrial waste. It is possible to manufacture resin materials with new properties from recycled materials as recycled products, contribute to the reduction of industrial waste, and to achieve a complete recycling process, it is possible to greatly reduce the cost of the new recycled products. A resin material and a manufacturing method thereof are provided.

  In order to achieve the above object, the resin material and the method for producing the same according to the present invention employ a basic technical configuration as shown below.

That is, in the first aspect of the present invention, a used olefin-based synthetic resin molded product and a used aggregate containing a fibrous cellulose component are supplied into a mixing apparatus having a stirring function, and the mixing apparatus while performing stirring operation at an internal, with grinding melt the spent olefin synthetic resin, mixing processes and cellulose component of the aggregate component and the fibrous olefin synthetic resin component of the spent reproduced In the method of producing a synthetic resin material, an aggregate having a moisture content of 5% or more is used as the aggregate in advance, and when the used olefin synthetic resin is agitated and pulverized, it melts due to heat generated by friction. the melting temperature of been the molten olefinic synthetic resin, by evaporation action of water contained in the said aggregate, perform the stirring and mixing process while suppressing below carbonization temperature of the cellulose component Saishi, as aggregate comprising a cellulose component of the fiber, a manufacturing method of reproducing a synthetic resin material, characterized in that the used gypsum board and spent cardboard is used.

  The resin material manufactured by the method of manufacturing the resin material according to the present invention uses materials that are prepared for recycling. However, since only the operation of stirring with a screw or the like is performed in the mixing apparatus, the energy and cost required for the recycling process can be kept low, so the price of the recycled product is low and ideal. It has the effect of being able to obtain fully recycled processes and fully recycled products.

  Furthermore, by mixing a small amount of sodium stearate into the mixture of the used olefin-based synthetic resin molded product and the used gypsum board, the olefin-based material can be obtained in a short time without carbonizing the cellulose fiber component, which is a paper component. It becomes possible to mix the synthetic resin and the gypsum board.

FIG. 1 is a cross-sectional view showing the structure of a resin material in the present invention. FIG. 2 is a diagram showing an outline of a resin material manufacturing apparatus in the present invention. FIG. 3 is a flowchart for explaining a specific example of the method for producing a resin material in the present invention.

  Below, the specific structure of the resin raw material concerning this invention and the manufacturing method of the said resin raw material is demonstrated in detail, referring drawings.

  That is, FIG. 1 is a diagram showing the configuration of a specific example of the resin material 1 according to the present invention. In the figure, the olefin-based synthetic resin component 2 includes a powdery gypsum component 3 and fibrous cellulose. A resin material in which component 4 is dispersed in a substantially uniform manner is shown.

  As a result of such a configuration, a part of the fibrous cellulose component 4 is exposed on the surface of the molded resin body at an appropriate ratio, so that the surface of the resin material exhibits a woody texture.

  In addition, as shown in FIG. 2, the method for producing a resin material according to the present invention comprises an olefin-based synthetic resin molded product 2 ′ and a gypsum board piece 5 crushed to an appropriate size. The olefin-based synthetic resin 2 ′ is crushed and melted while being sequentially supplied into a mixing device 10 having a stirring means 9 made of a screw or the like rotated by a motor 8 and performing the stirring operation in the mixing device 10. Then, the molten olefin-based synthetic resin 2 and the above two components are mixed while supplying the gypsum board piece 5 and crushing it to separate it into a powdery gypsum component and a fibrous cellulose component. This is a method for producing a resin material containing a gypsum component and a cellulose component.

  In other words, in the present invention, when the aggregate is mixed in the conventional synthetic resin, the common sense that it is necessary to use an aggregate that does not contain moisture, and the water content is positively high. By using gypsum, a novel resin material having a woody texture in which a gypsum component, a fibrous cellulose component, and an olefin synthetic resin component are uniformly mixed can be obtained.

Here, the basic technical idea of the method for producing the resin material in the present invention will be described below.
That is, as the main resin used in the present invention, a used olefin-based (mainly PP) resin molded product from container recycling is used.
In addition, a gypsum board that has already been used, that is, a gypsum board that has become waste, is used.

In the present invention, the olefin-based resin molded product is melted by an appropriate mixer, and the used gypsum board is mixed therewith.
After the mixing process is completed, the mixture is pulverized to a certain size and becomes a plastic raw material.
That is, when the recycled resin is produced, the olefin resin molded product is first melted in a process.
And the said used gypsum board is mixed at the time of the said fusion | melting.

As a result, since the temperature of the olefin-based resin exceeds 170 ° C. when melted, the moisture contained in the gypsum board is released at once by this heat.
Next, to explain the gypsum board paper in question, the ratio of gypsum board to paper varies depending on how the gypsum board was disposed of, but generally the gypsum is 8 to 9.58. The ratio of paper is 2 to 0.5.

  However, in general, the gypsum board contains a water content of 20% on average. Therefore, when the mixing ratio of the gypsum board in the calculation is 55%, the gypsum board was used for blending. In this case, resin is 50%, gypsum is 45%, and paper is 5%, which is a resin material having a preferable mixing ratio.

Since the resin material in the present invention contains a relatively long fibrous cellulose component, the cellulose extracted from the paper component contained in the gypsum as well as the conventionally known resin containing paper sludge. The fiber mixes with other ingredients to improve the strength, and at the same time, a merit that the texture of the molding becomes a woody system is born.
Furthermore, if it demonstrates more concretely about the manufacturing method of the resin raw material of this invention, conventionally, melting of resin is generally melted by heating the said resin externally.

  However, in the present invention, the olefin resin molded product is charged into a mixer (mixing machine) 10 and the screw 9 is rotated. As a result, the olefin resin molded product rotates at a high speed. The resin hits a propeller or a screw, and the resins collide with each other to generate frictional heat. By repeating this, the olefin resin molded product starts to melt.

That is, the used olefin resin molded product rotated by the mixer is melted by frictional heat, and the temperature of the used olefin resin molded product at this time exceeds 170 ° C.
At that time, if the paper component is put in the used olefin resin molding being melted, the paper will carbonize in a few minutes. Will disappear.

However, the olefin resin molded product heated to 170 ° C. is gelled in the mixer.
When a gypsum board having a water content of 20% is put into the heat-melted olefin resin molded product, intense water evaporation is started.

At that time, the gypsum board is still in a state where the gypsum and the paper are not separated, and the internal moisture is evaporated.
If the situation is observed in detail, it is considered that the water is heated to a high temperature while the water is evaporated, but conversely, when sodium stearate is acting effectively, 100 It is thought that the paper is cooled with water vapor at or above.

In other words, while the water is evaporating, the paper is prevented from ashing from the heat of the gelled resin at 170 ° C. by water vapor.
In other words, in the present invention, by adopting the above-described configuration, the timing of ashing of paper or cellulose fiber is removed and mixing with the resin is performed.
When the mixing is completed, the mixture is cooled at once.

At this time, an additional 0.5 to 3% by weight of the material to prevent carbonization, preferably also preferred embodiment the addition of sodium stearate as 1% at the same time, whereby the time which the cellulose fibers are carbonized It can be made even slower.

  By adding sodium stearate, it is presumed that sodium stearate will probably adhere to the gypsum board to create a coating film and reduce the frictional force, thereby preventing an increase in the temperature of the paper and slowing the carbonization speed.

As another application of the present invention, when the cardboard is mixed with the resin, the same means can be used when the cardboard is mixed without being carbonized .
In other words, in the present invention, a used olefin resin molded product is put in a mixer in advance and mixed at high speed, and the moisture content of the gypsum is lowered by frictional heat between the plastics. At this time, the used olefin-based resin molded product has started to melt, and thus has a temperature of around 170 ° C. If a used gypsum board with a high water content is put here as it is or after being appropriately crushed, the used gypsum board is pulverized into a gypsum powder, the paper is sheared, It becomes a long fibrous cellulose component. At that time, the moisture of the used gypsum board evaporates and dissipates heat at once, and it is possible to prevent the temperature of the paper from rising to a temperature at which the paper is carbonized.

Since the paper is not carbonized at all while the water vapor is emitted, it can be assumed that the water vapor has cooled the paper.
Then, as a result of repeating various experiments, it was found that the water of the gypsum board promoted the mixing of the olefin resin molded product and the gypsum board.

  In addition, although the component is not specifically limited, the gypsum board used in this invention has hemihydrate gypsum, dihydrate gypsum, or anhydrous gypsum as a main component. You can use plasterboard.

  Further, it has been found that when paper is mixed into the olefin resin molded product by this method, the strength is increased as compared with the case of mixing pulverized paper as in the conventional method. This is because the paper is subjected to a so-called shearing process in which the paper is pulled and torn in the mixer, and the fiber length is overwhelmingly longer than that of the pulverized product.

  Furthermore, according to the present invention, cellulose having a long fiber length cannot be mixed in a conventional plastic, whereas, for example, by mixing about 1% to 3% of sodium stearate, the fiber can be removed. The oil and fat component adheres to the wing-shaped part of the material to improve the wetting performance, making the plastic easier to accept, and controlling that the fiber does not collapse or carbonize due to friction. It turned out to be uniform.

  Furthermore, in the present invention, when gypsum board is mixed with plastic as it is, it is also characterized in that gypsum and paper are mixed with an olefin resin molded product without decreasing the water content without separating the gypsum and paper. .

As the olefin-based synthetic resin used in the present invention, used polypropylene resin and polyethylene resin can be used.
In the present invention, as the olefin-based synthetic resin component, as a raw material, a product handled as industrial waste, such as a used plastic container or a resin product made of polypropylene resin, It manufactures recycled products.

  These olefin-based synthetic resins are once melted and processed into pellets of an appropriate size. In the present invention, mainly the pellet-shaped or pulverized olefin-based synthetic resins are used. Is desirable.

On the other hand, the gypsum board used in the present invention is also used as a raw material, which is already used and handled as industrial waste.
Accordingly, in the present invention, since a large amount of materials existing in the industrial waste market are used as raw materials, there is an advantage that the cost for procurement of raw materials can be suppressed to a low cost.

  In the present invention, as described above, the used olefin-based synthetic resin molded product as the olefin-based synthetic resin component is crushed into an appropriate size, and is put into an appropriate mixer and stirred. As a result, heat is generated by the frictional heat between the resins, and the olefin-based synthetic resin molding is in a molten state.

In this state, in the olefin-based synthetic resin used in the molten state, by mixing a gypsum board spent crushing to moderate size, and to continue the stirring operation along with the spent olefin synthetic resin, the gypsum evaporates during which water is water, whereby the melting temperature of the spent olefin synthetic resin is adjusted so that the following carbonization temperature of the paper contained in the gypsum performed, using The gypsum granules and paper separated from the finished gypsum board are separated, but the paper components can exist under temperature conditions below the conversion temperature, so that they are not carbonized and are sheared by stirring the mixer. In response to the operation, fibrous cellulose having a relatively long length is separated.

The three kinds of components are mixed substantially uniformly, and the resin material in a state in which the gypsum component and the cellulose component are dispersed in the olefin-based synthetic resin as a matrix is obtained.
It is possible to obtain a resin product in which the resin material is finely divided into pieces and molded into a desired shape using an appropriate extrusion molding machine or injection molding machine.

  Next, various experiments were conducted on the mixing ratios of the olefin-based synthetic resin component, the powdery gypsum component, and the fibrous cellulose component in the resin material or the resin molded product using the resin material in the present invention. As a result, first, it was found that the mixing ratio of the olefin-based synthetic resin component and the gypsum board is preferably in the range of 20:80 to 60:40, and as described above, In the waste gypsum board in which the ratio of paper (the cellulosic fiber component) is generally used, since the gypsum is 8 to 9.5 and the ratio of paper is 0.5 to 2, Olefin synthetic resin component, mutual mixing ratio of gypsum component and fibrous cellulose component, olefin synthetic resin component: gypsum component: fibrous cellulose component, 20:64 to 76: 4 to 16 Or it is, 60: 32-38: It has been found that it is desirable 2-8.

Therefore, in the resin material in the present invention or a resin molded product using the resin material,
The mixing ratio of the olefin synthetic resin component is 30 to 50%,
The mixing ratio of the powdery gypsum component is 63 to 40%, and
Mixing ratio of fibrous cellulose component is 14-5%
It is desirable to have a composition ratio of

  In the present invention, the characteristics of the resulting new resin material change depending on the mixing ratio of the olefin-based synthetic resin component and the gypsum component, and the olefin-based synthetic resin component is different from the gypsum component. If it is more, it becomes a resin material containing gypsum, and conversely if it is more than the olefin-based synthetic resin component, it becomes a resin-containing gypsum board.

Furthermore, in the present invention, sodium stearate may be further included in addition to the above components of the olefin synthetic resin material.
The mixing ratio of sodium stearate in the present invention is not particularly limited, but the mixing amount of sodium stearate is preferably 0.5 to 3% by weight, particularly 1% by weight. desirable.

  Next, the new resin material obtained by the present invention is improved in strength as a resin material because the cellulose component having a relatively long fiber length is interposed between the olefin synthetic resin and the gypsum component. In addition, since the cellulose having the long fiber length appears moderately on the surface of the resin material, a woody texture can be obtained.

In addition, the resin material in the present invention is strong in water resistance and therefore can be used as an outdoor deck material, and further has a slip resistance on the surface of the resin material, so that it is wet with water. Therefore, it has a feature that a person is unlikely to slide even if he / she walks on it.
Table 1 below compares and compares the surface slip resistance values of cedar, which is a typical wood as a conventional outdoor deck material, and the resin material of the present invention.

From the above comparison data, it is understood that the resin material in the present invention has a slip resistance value substantially equal to that of cedar.
For reference data, the slip resistance value specified in the Ordinance Facility Maintenance Manual is shown.
The part which walks with lower leg 0.4-0.9
Part walking with upper leg 0.35-0.9
Part walking with bare feet 0.45-0.9
Ramp part 0.5-0.9

  The above-mentioned measuring method of the slip resistance value is a measuring method on the premise of human walking, and is obtained from the load at which the rubber piece moves when the rubber piece with a weight is placed on the floor and pulled diagonally from above. It is based on JIS A1454 (polymer type tension flooring test method).

  In addition, in the resin material according to the present invention, the physical properties of the new gypsum board in which the mixing ratio of the used gypsum board is 55% by weight are compared with the physical properties of cedar.

The above data varies depending on the molding section and molding conditions.
From the above physical property table, it can be seen that the resin material according to the present invention is a member having excellent weather resistance, ant resistance, and decay resistance, although it is slightly inferior in strength to wood cedar.

Judging from these, it seems that the resin material according to the present invention is suitable for outdoor exteriors and building materials around water.
That is, the resin material according to the present invention is characterized in that the slip resistance value (CSR) is 0.74 to 0.81.

Next, the method for producing the resin material in the present invention will be described.
The method for producing the resin material of the present invention basically supplies the olefin-based synthetic resin 2 ′ and the gypsum board 5 sequentially into a mixing apparatus 10 having a stirring function 9, as shown in FIG. While performing the stirring operation in the mixing apparatus 10, the olefin synthetic resin 2 ′ is pulverized and melted, and the gypsum board 5 is pulverized to be separated into a powdery gypsum component 3 and a fibrous cellulose component 4. However, it is a method for producing a resin material containing a gypsum component and a cellulose component, characterized by mixing the above three components.

  In particular, the technical feature of the present invention is that when the olefin synthetic resin 2 ′ is stirred and pulverized, the melting temperature of the molten olefin synthetic resin 2 melted by heat generated by frictional heat is determined by the gypsum board. When 5 is mixed, the water that the gypsum board 5 originally contains water is evaporated, whereby the stirring treatment is performed while suppressing the temperature below the conversion temperature of the cellulose component 4.

That is, by mixing the used gypsum board 5 to olefin synthetic resin 2 used in a molten state was ground both to separate the gypsum board 5 of the spent to gypsum component 3 and the paper component, further the When the fibrous cellulose component 4 is generated by shearing the paper component, mixing treatment is performed while maintaining the melting temperature of the used olefin-based synthetic resin 2 below the carbonization temperature of the cellulose 4.

And in this invention, the said mixture is rapidly cooled at the time of completion | finish of isolation | separation of each component of the said gypsum board 5 by the said mixing process.
Furthermore, in the present invention, as described above, it is preferable to add sodium stearate when sequentially supplying the olefin-based synthetic resin 2 ′ and the gypsum board 5 into the mixing apparatus having a stirring function. .

In the present invention, the amount of sodium stearate mixed is 0.5 to 3% by weight, more preferably 1% by weight.
In the present invention, the mixing ratio of the olefin synthetic resin 2 ′ and the gypsum board 5 charged into the mixer is 20 to 60% by weight of olefin synthetic resin, preferably 30 to 45% by weight. It is desirable that the gypsum board is 40 to 80% by weight, preferably 55% to 70% by weight.

In the present invention, the olefinic synthetic resin material mixed and produced by the above method can be molded using, for example, a profile extrusion molding apparatus or an injection molding apparatus.
As described above, the present invention realizes complete recycling. Specifically, the used olefin-based synthetic resin molded product and the used gypsum board are sequentially supplied into a mixing apparatus having a stirring function. The olefin synthetic resin is pulverized and melted while stirring in the mixing apparatus, and the gypsum board is pulverized and separated into a powdery gypsum component and a fibrous cellulose component. This is a method of mixing the powdered gypsum component and the fibrous cellulose component to the olefin-based synthetic resin, and molding and processing it to produce a completely recycled resin material with a wood tone. In addition to being kept at a low price, since the subsequent processing steps do not consume extra energy due to external heating, the processing costs can be kept low.

As an additive used in the present invention, sodium stearate is preferably used, but it is also possible to add a small amount of waste oil which is one of industrial wastes.
Below, the procedure of the manufacturing method of the said resin raw material in this invention is demonstrated, referring the flowchart shown in FIG.

That is, in step S-1, a used olefin resin molded product is selected, and in step S-2, it is pulverized into pellets of an appropriate size.
At this stage, for example, a V series grinder manufactured by Horai Co., Ltd. can be used.

The components of the pelletized pulverized product generally comprise 60% PP, 30% PE, and 10% PS.
Then, it progresses to step S-3 and it is possible to use the said pellet for the mixing apparatus 10 which has the rotary blade 9, for example, the mixing apparatus (mixer) of the Mitsui Miike Co., Ltd. make.

  In step S-4, friction heat is generated in the pellet-shaped olefin resin molding by the rotation of the rotary blade 9 in the mixing device, and the pellet-shaped olefin resin molding starts to be melted by the heat. .

  When it becomes such a state, the used gypsum board selected in step S-6 is crushed to an appropriate size in step S-7 as necessary, and the crushed gypsum board 5 is stepped. In S-8, the mixture is introduced into the mixer and mixed with a molten olefin resin molded product in which at least a part is in a molten state, and the mixing operation is continued.

  The used gypsum board usually has a size of 900 mm x 1800 mm, but it is crushed to a certain size at the site of building demolition, and even at the time of demolition, it is crushed to a size of about 300 mm x 300 mm. ing.

The input port of the material to be crushed in the mixing apparatus 10 is designed to be quite large, and the above-described gypsum board 5 after crushing can be charged as it is.
However, in practice, the gypsum board is often provided with a metal screw or the like, and the metal component may destroy the mixing device 10 or the molding die or the molding machine during molding. Therefore, it is desirable to remove it.

  For this reason, it is desirable that the gypsum board be further finely crushed. Specifically, the gypsum board is at least one side long or about 30 mm in length corresponding to the diameter. The metal material or the like that is roughly crushed and adhered thereto is removed by a magnetic separation means or the like.

Of course, in the present invention, the size of the gypsum board at the time of crushing is not particularly limited.
In the present invention, if necessary, as shown in step S-15, sodium stearate is added to the mixing device at the same time as the gypsum board is put into the mixing device 10. It is added within the range of the weight ratio.

  Thereafter, in step S-9, the above mixing operation is continued. In step S-10, the separation of the gypsum component and the paper from the gypsum board is completed, and the cellulose component constituting the paper. Is subjected to a shearing force and stretched into a fibrous form.

Then, it progresses to step S-11 and operation which quenches the said mixture rapidly is performed.
In this step, the mixed material in the mixing apparatus 10 is heated at around 200 ° C., and an apparatus such as a cooling mixer DF300 manufactured by Mitsui Miike Co., Ltd. can be used as the mixture.

The configuration of the cooling mixer is substantially the same as that of the mixing device described above, and a rotating screw is disposed in the mixer, and cooling water having an average of about 15 ° C. is injected while rotating the screw.
In addition, the inner wall of the cooling mixer has a double structure, ensuring heat insulation from the outside.

In this step, the temperature of the mixture is cooled to room temperature after about 20 minutes.
Thereafter, the cooled mixture is sent to the molding process of step S-12, and once melted and heated, injected into a predetermined mold and molded into a predetermined shape, and then step S-13 again. A new gypsum board is completed by cooling using the cooling water described above.

  In the present invention, when the olefin synthetic resin molded product and the gypsum board are mixed, a cellulose-based component such as paper is additionally mixed in addition to the cellulose fiber component contained in the gypsum board. Things are also possible.

  The present invention is a resin material by a complete recycling system composed of an olefinic synthetic resin component and a gypsum material, and is effectively used as a material having a woody tone in the fields of civil engineering and building materials, furniture, sundries, etc. I can do it.

Claims (2)

Supply the used olefin-based synthetic resin molding and the aggregate containing the used fibrous cellulose component into a mixing device having a stirring function, and perform the stirring operation in the mixing device while using the used while pulverizing melt the olefinic synthetic resin, in the method for manufacturing recycled synthetic resin material by mixing processes the cellulose component of the spent olefin synthetic resin component to the aggregate component and the fibrous, the When using an aggregate having a moisture content of 5% or more in advance as an aggregate, and stirring and grinding the used olefin synthetic resin, the melting temperature of the molten olefin synthetic resin melted by heat generated by friction is set. , by evaporation action of water contained in the said aggregate, when performing the stirring and mixing process while suppressing below carbonization temperature of the cellulose component, the cellulose formed in the fibrous Manufacturing method of reproducing a synthetic resin material which as an aggregate, characterized in that the used gypsum board and spent cardboard is used containing. 2. The used olefin-based synthetic resin, the used gypsum board, and used cardboard are fed into a mixing apparatus having a stirring function, and sodium stearate is further added. A method for producing a recycled synthetic resin material as described in 1.

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