JPH07124947A - Molded mater comprised of waste plastic and its manufacture - Google Patents

Abstract

PURPOSE:To make use of thermosetting plastic being a major part of a matter which is used conventionally only for a limited use and discharged as waste plastic trash is used as a concrete shuttering for concrete shuttering work. CONSTITUTION:Sticking disposition of styrene or polymerizable styrene derivative is performed to the surface of thermosetting waste plastic powder, then obtained thermosetting waste plastic powder treated with polymerizable styrene is heat-treated in the presence of a polymerization initiator, then an obtained product is ground, which is mixed with waste polystyrene, heated and molded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for effectively utilizing waste plastic and using it as a frame material for manufacturing a formwork used for concrete formwork construction. The present invention particularly relates to a thermosetting waste plastic powder obtained by heat treatment in the presence of a polymerization initiator, and a styrene or a polymerizable styrene derivative being adhered to at least the surface thereof, or a thermosetting waste plastic powder obtained as a pulverized product. Alternatively, from a thermosetting waste plastic and waste polystyrene characterized by being crushed a mixed solid consisting of a crushed product and polystyrene, the crushed product thus obtained is mixed with waste polystyrene, and heat-molded. Related to the molded article.
In particular, the present invention has a thermosetting waste plastic content of 2
The present invention relates to a molded product composed of 0% or more of thermosetting waste plastic and waste polystyrene, and further to a technique for utilizing them as a frame material for manufacturing a formwork used for concrete formwork construction.

The present invention was further obtained by immersing a thermosetting waste plastic powder in a liquid of styrene or a polymerizable styrene derivative, heat-treating it in the presence of a polymerization initiator, and then pulverizing the obtained product. The present invention relates to a method for producing a molded product composed of a thermosetting waste plastic and waste polystyrene, which comprises mixing a pulverized product with waste polystyrene and heat-molding the mixture. More specifically, in the present invention, the thermosetting waste plastic powder is immersed in styrene or a polymerizable styrene derivative liquid and heat-treated in the presence of a polymerization initiator, for example, heat-treated at 80 ° C. or higher to obtain styrene or a polymerizable styrene derivative. At least the surface of the thermosetting waste plastic powder is treated with the styrene derivative, and then the resulting product is crushed, and the crushed product thus obtained is mixed with the waste polystyrene powder or the crushed product, and heat-molded. The present invention relates to a method for producing a molded article composed of a thermosetting waste plastic and a waste polystyrene, which is characterized by the fact that the present invention relates to a formwork used in the construction of a concrete formwork thus produced.

[0003]

2. Description of the Related Art In recent years, concrete formwork has been widely used in construction work. However, in order to manufacture a formwork used for the concrete formwork, As the frame material, raw trees of tropical forests such as Lauan are often used as raw materials. In fact, about 60% of the formwork materials used for concrete formwork construction are Lauan plywood manufactured from Lauan. Since this plywood is made by laminating thinly peeled wood sheets and adhering them together, the fibers of the wood are continuous and strong against bending and tensile forces received when used as a formwork. It has the characteristics of being hard and having little bending deformation. However, it is hard to say that they still have sufficient strength and elastic modulus, and there is a demand for the development of those having better properties. In addition, using raw wood obtained from tropical forests such as Lauan preserves the global environment and reduces the use of it even if it is unavoidable or unavoidable in order to prevent further deterioration of the environment. Is strongly demanded. From this point of view, the development of alternative formwork using new materials replacing wooden formwork has been strongly promoted.

The following are examples of such alternative molds. 1. 1. Particleboard reinforced with mesh-like fibers by using the residual materials from the sawmill and the demolition materials of the house as wood pieces. Utilizing a large amount of plant fiber contained in low-grade waste paper,
2. The waste paper is dried and defibrated, chemically treated, admixed with additives, and the resulting material is heat-compressed and molded to produce a board, and Polypropylene board reinforced with fiber made of virgin material. Some of these alternative forms have been used,
The mainstream of these alternative formwork is to recycle waste wood and used paper as materials. In recent years, of the amount of waste that is discharged, the amount of waste that is discharged is increasing significantly, and the amount is about 500 per year.
The amount is up to 10,000 tons, and the amount tends to increase more and more. Of the waste plastic, the amount of waste plastic discharged as industrial waste is about 2 million tons, and the amount of waste plastic discharged from homes amounts to about 3 million tons.

Of these waste plastics, thermoplastic waste plastics can be melted and restored to their original state by applying heat, so that they can be heat-molded, and by utilizing this property, the type of waste plastic is selected. Approximately 27% of the industrial waste that is easy to collect as thermoplastic waste plastic is reused as a raw material, reprocessed into the original product, or used as a building civil engineering material such as piles, rods and boards. , The material cycle is done. However, thermosetting plastics are such that the molecules have a three-dimensional network structure, and once molded into a product from raw materials, they have a three-dimensional network structure and are no longer deformed even if heat is applied again. Therefore, the way to recycle the waste plastics collected is not limited to crushing the waste finely and mixing it as a filler for the same kind of plastics. There is. Thus, thermosetting waste plastic can be used only for limited purposes, but the mixing ratio is about 2
It also has a problem that it can be compounded only up to about 0%. For this reason, most of the waste plastics consisting of thermosetting plastics must be landfilled at the waste disposal site or incinerated at present. Such thermosetting waste plastics can be reused from the viewpoint of global environment conservation and effective use of resources,
The development of applications has become an urgent and important issue.

Typical examples of thermosetting plastics are phenolic resins and urea resins. However, as shown in Table 1 below, they have a higher mechanical strength than thermoplastics, so if they are recycled materials. If it can be reused in the production of alternative formwork for concrete formwork, its utility value is considered to be extremely high. Further, among the thermoplastics, polystyrene has a relatively high mechanical strength, and it is considered that the utility value of polystyrene is also very large if it can be reused as a recycled material in the production of an alternative mold.

[0007]

[Table 1]

However, until now, there has never been provided an alternative formwork for concrete formwork construction in which these waste plastics are reused. The present inventors have examined the use of waste polystyrene among thermosetting waste plastics and thermoplastics, and utilize the crushed thermosetting waste plastics as a filler for the waste polystyrene to obtain the recycled material thus obtained. If it could be used to manufacture alternative formwork, it would be possible to manufacture formwork used for concrete formwork construction with excellent properties, and I think that it would be possible to expand the use of thermosetting waste plastic. Diligently developed. However, if the thermosetting waste plastic powder is mixed as it is with the waste polystyrene pellets of the thermoplastic, and the content of the thermosetting waste plastic powder is 20% or more,
The mixture consisting of the thermosetting waste plastic powder and the waste polystyrene pellets cannot be made into a uniform mixture and forms a so-called "dama", and it is impossible to smoothly perform injection and extrusion. However, the heat molding that is indispensable for using plastic cannot be done. In fact, the mixture of thermosetting waste plastic powder as it is with thermoplastics cannot be injection-molded or extruded, and it is not possible to manufacture a mold with excellent properties that can be used for mold construction. It was Further, generally, when different types of plastics are mixed to produce a product, there is a problem in that the mechanical strength of the product is reduced and the shape is irregular. Thus, it has not been possible until now to use the powder of thermosetting waste plastics as a filler for thermoplastic waste plastics such as waste polystyrene.

[0009]

The present inventors have completed the present invention as a result of earnest research and development for solving the above-mentioned obstacles or problems by a simple method. That is,
The present invention heat-treates in the presence of a polymerization initiator to pulverize a thermosetting waste plastic powder or pulverized product having styrene or a polymerizable styrene derivative attached to at least the surface thereof and pulverizing a solid mixture of polystyrene. ,
A crushed product thus obtained is mixed with waste polystyrene, and a molded product comprising thermosetting waste plastic and waste polystyrene, characterized by being heat-molded. In particular, the present invention relates to a molded product composed of a thermosetting waste plastic having a thermosetting waste plastic content of 20% or more and a waste polystyrene. The present invention further immerses a thermosetting waste plastic powder in styrene or a polymerizable styrene derivative, heat-treats it in the presence of a polymerization initiator, then grinds the product obtained, and disposes of the grinded material thus obtained. Provided is a molded product composed of a thermosetting waste plastic and a waste polystyrene, which is characterized by being mixed with polystyrene and molded by heating. More specifically, in the present invention, the thermosetting waste plastic powder is immersed in styrene or a polymerizable styrene derivative liquid, and the resulting polymerizable styrene-treated thermosetting waste plastic powder is then added in the presence of a polymerization initiator. Heat treatment, for example, heat treatment to 80 ° C. or higher, styrene or polymerizable styrene derivative is attached to at least the surface of the thermosetting waste plastic powder, and the obtained product is pulverized, and the pulverized product thus obtained is pulverized. There is also provided a molded product composed of waste polystyrene and waste polystyrene, which is characterized by being mixed with a waste polystyrene powder or a pulverized product and heat-molded.

The present invention is characterized in that a thermosetting waste plastic powder or pulverized product having at least the surface thereof treated with styrene or a polymerizable styrene derivative in the presence of a polymerization initiator is mixed with waste polystyrene and heat-molded. The present invention relates to a method for producing a molded article composed of thermosetting waste plastic and waste polystyrene. In particular, the present invention is a method for producing a molded article composed of a thermosetting waste plastic and a waste polystyrene when the content of the thermosetting waste plastic is 20% or more, for example, 50% or more. Also related to. The present invention further immerses the thermosetting waste plastic powder in styrene or a polymerizable styrene derivative liquid, heat-treats it in the presence of a polymerization initiator, then grinds the product obtained, and grinds the grinded product thus obtained. Also provided is a method for producing a molded article composed of waste polystyrene and thermosetting waste plastic, which is characterized by being mixed with waste polystyrene and heat-molded. More specifically, in the present invention, thermosetting waste plastic powder is immersed in styrene or a polymerizable styrene derivative liquid, and heat-treated in the presence of a polymerization initiator, for example, heat-treated at 80 ° C. or higher to obtain styrene or polymerized. Heat-molded by subjecting at least the surface of a thermosetting waste plastic powder to at least a heat-resistant styrene derivative, crushing the product obtained, and mixing the crushed product thus obtained with a waste polystyrene powder or a crushed product. The present invention relates to a method for producing a molded product composed of thermosetting waste plastic and waste polystyrene.

Examples of the thermosetting waste plastic include crushed products of epoxy resin, silicone resin, unsaturated polyester resin, phenol resin, urea resin and the like, and those having relatively high mechanical strength are preferred. Use. These thermosetting waste plastics may be composed of a miscellaneous mixture classified as thermosetting plastics among industrial wastes or waste plastics collected as waste from households. It may include waste plastics other than those classified, and most of the constituents of which are thermosetting plastics. Preferable examples of the thermosetting waste plastic that can be used here include crushed molded products such as phenol resin and urea resin. The phenol resin refers to a resin obtained by a condensation reaction of phenols and aldehydes, and as the phenols, for example, phenol,
Examples include meta-paracresol, xylenol, bisphenol A, bisphenol F, meta-tertiary butylphenol, resorcin, and the like. Examples of aldehydes include formaldehyde, paraformaldehyde, acetaldehyde, propionaldehyde, and the like. Ingredients may be included. The urea resin refers to one obtained by a condensation reaction of ureas and aldehydes, and the ureas include unsubstituted urea, mono- or dialkyl-substituted ureas, mono- or diaryl-substituted ureas, and the like. Examples thereof include formaldehyde, paraformaldehyde, acetaldehyde, propionaldehyde, and the like, but constituent components other than these may be contained. As the thermosetting waste plastic, a crushed product of a phenol resin or a crushed product of a urea resin may be used singly or may be used by mixing them at an appropriate ratio. . The thermosetting waste plastics used here should include those derived from phenol resin molded products or those derived from urea resin molded products in the most uniform form as long as the final product has the same properties. Is more preferable.

In the present invention, the pulverized product obtained by pulverizing the thermosetting waste plastic powder or the molded product is treated with styrene or a polymerizable styrene derivative. The term "polymerizable" as used herein means to have a group that can be polymerized by heating in the presence of the following polymerization initiator, for example, having a group that can react with radicals generated by thermal decomposition such as peroxide molecules. Therefore, the polymerizable monomer having a similar function is not limited to styrene or a polymerizable styrene derivative,
It can be used without departing from the object of the present invention. Examples of styrene and polymerizable styrene derivatives include styrene monomers, alkyl-substituted styrenes, halogeno-substituted styrenes, and the like, and styrene monomers are preferably used. When styrene monomer is used as the treating agent, the thermosetting waste plastic is treated by being immersed in the styrene monomer. In this treatment, styrene or a polymerizable styrene derivative may be substantially attached to the surface of at least a pulverized product obtained by pulverizing the thermosetting waste plastic powder or the molded product. When processing thermosetting waste plastic,
It may be desirable to remove the oxygen dissolved in the treating agent such as a styrene monomer in advance.

The resulting polymerizable styrene-treated thermosetting waste plastic is then heat-treated in the presence of a polymerization initiator.
This heating may be carried out as long as the polymerizable styrene portion reacts on the surface of the treated thermosetting waste plastic to cause thermal polymerization and form a mixed solid substance composed of the thermosetting waste plastic and polystyrene. . Preferably 80 ° C
Alternatively, it is performed by heating to a higher temperature. The heating temperature can be appropriately selected without departing from the object of the present invention.

As the polymerization initiator, a Friedel-Crafts type catalyst such as aluminum chloride, an alkali metal such as metallic sodium, an organic alkali metal compound such as butyllithium, a complex of a titanium compound and an organoaluminum compound such as a Ziegler-Natta catalyst. , Azodicarbonamide, azobisformamide, azobisisobutylnitrile, diazoaminobenzene, N, N'-dinitron pentamethylenetetramine, N, N'-dimethyl N, N '.
-Azo or nitrone compounds such as dinitrone terephthalamide, benzenesulfonyl hydrazide, paratoluenesulfonyl hydrazide, oxybisbenzenesulfonyl hydrazide, benzoyl peroxide, tert-butyl hydroperoxide, cumene hydroperoxide, potassium persulfate, ammonium persulfate, Fenton's reagent And redox-based agents such as. Examples of the polymerization initiator include those which are thermal polymerization initiators of styrene.

The solid mixture of thermosetting waste plastic and polystyrene is pulverized by a usual method to obtain a powder or a pulverized product. The mixed solid material composed of the pulverized thermosetting waste plastic and polystyrene is mixed with the waste polystyrene. Mixing can be done well. The mixing of the solid mixture of the pulverized thermosetting waste plastic and polystyrene and the waste polystyrene can be uniformly mixed with the waste polystyrene even if the content of the thermosetting waste plastic is 50% or more. It is possible and does not cause a substantial problem in the distribution of both components in the molded product of the recycled product in the subsequent heat molding treatment. When this mixture of solid waste consisting of pulverized thermosetting waste plastic and polystyrene and waste polystyrene is heat-treated, the pulverized thermosetting waste plastic functions as a filler, and the polystyrene part acts as an adhesive. However, the thermosetting waste plastics can also be bonded together and molded. In the mixture of this thermosetting waste plastic and waste polystyrene, styrene is chemically bound to the thermosetting waste plastic molecule or its periphery, and also around the thermosetting waste plastic powder, whereby the thermosetting waste plastic is bound. It is believed that the plastic and the waste polystyrene have become intimate to form a thermoformable mixture. Therefore, it will be appreciated that the starting raw materials used are not limited as long as such a mechanism is utilized.

Examples of the waste polystyrene include crushed polystyrene molded products such as multipurpose polystyrene and impact polystyrene, and those having relatively large mechanical strength are preferably used. These waste polystyrenes may contain a styrene resin composed of acrylonitrile / styrene, a styrene resin composed of acrylonitrile / butadiene / styrene, or the like. These polystyrenes may consist of miscellaneous mixtures classified as thermoplastic waste plastics among waste plastics recovered as industrial waste or household waste, and most of the constituents are polystyrene. You may include things. Preferable examples of the waste polystyrene that can be used here include crushed polystyrene molded products such as waste polystyrene pellets. As the waste polystyrene, a product obtained by crushing a molded product of multipurpose polystyrene or a product obtained by crushing a molded product of impact polystyrene may be used alone, or may be used by mixing them at an appropriate ratio. As the waste polystyrene used here, those obtained by containing polystyrene in a uniform form as much as possible from those derived from resin molded products are used.
It is more preferable that they give the final product having constant properties.

As for the mixing ratio of the thermosetting waste plastic and the waste polystyrene, it is desirable to use a large amount of the thermosetting waste plastic whose use has been limited so far. The amount can be 20% or more by weight. According to the present invention, as long as the mechanical properties of the obtained heat-molded product are not deteriorated or the heat-molding process is not adversely affected, the mixing amount of the thermosetting waste plastic can be increased, and the thermosetting waste plastic can be used as a whole. The amount of waste plastic can be blended in 50% or more by weight. Even if the amount of the thermosetting waste plastic is 50% or more by weight with respect to the whole, there is no problem in the heat molding process, and a molded product having excellent properties can be obtained. As the heat molding method, a usual plastic molding method can be applied, and for example, a compression molding method, an injection molding method, an extrusion molding method or the like can be used. In the compression molding method, a multi-stage press is used, and continuous molding such as using a rotary table, impact compression molding, ultrasonic compression molding, hydraulic molding, etc. are appropriately selected and processed according to the purpose. . Among injection molding methods, there are those that use a plunger type injection molding machine such as an in-line screw type.
A method using a program-controlled injection molding machine can be mentioned. Further, in injection molding, it is also possible to perform heat molding as a composite material such as FRP. Foam molding can also be performed when heat molding is applied.

According to the present invention, the mixture of the pulverized material obtained from the mixed solid material of thermosetting waste plastic and polystyrene and the waste polystyrene is subjected to the heat molding treatment and used for the concrete formwork construction. The frame can be manufactured. The formwork thus obtained may be a simple flat plastic plate, may be a flat plate obtained by laminating simple flat plates in multiple layers, or may be a flat plate having a corrugated cardboard-like cross-sectional structure composed of plastic plates. It may be a ribbed plastic plate having a flat plate. According to the present invention, a plate suitable for a formwork used for concrete formwork using a mixture of a pulverized product obtained from a solid mixture of thermosetting waste plastic and polystyrene and waste polystyrene is provided. It can be manufactured easily and inexpensively and on an industrial scale. It is also possible to add a foaming agent during the heat-molding process of the plastic plate and heat-foam after molding to obtain a lightweight plastic plate.

Various foaming agents are known, and decomposition type foaming agents and volatile type foaming agents are known.
As the decomposition-type foaming agent, decomposition temperature, amount of generated gas, diffusibility into the base material, selected from among preferable conditions such as corrosiveness of decomposition gas, sodium bicarbonate, ammonium carbonate, ammonium bicarbonate, Ammonium nitrite,
Azide compounds, sodium borohydride, light metals (magnesium, zinc, aluminum, etc.), azodicarbonamide, azobisformamide, azobisisobutylnitrile, diazoaminobenzene, N, N'-dinitron pentamethylenetetramine, N, N '. -Dimethyl N, N '
-Dinitron terephthalamide, benzene sulfonyl hydrazide, paratoluene sulfonyl hydrazide, oxybis benzene sulfonyl hydrazide, etc. are mentioned.
As the volatile foaming agent, pentane, neopentane, hexane, isohexane, heptane, isoheptane, benzene, toluene, dichloromethylene, trichloroethylene, dichloroethane, dichlorotetrafluoroethane,
Examples thereof include trichlorofluoromethane. These foaming agents can be appropriately selected and used from commercially available products or known general-purpose products depending on the intended use of the final product.

[0020]

EXAMPLES Next, the present invention will be specifically described by way of examples. Example 1: A molded product of phenol resin and urea resin collected as industrial waste was crushed and used as a thermosetting waste plastic. Phenol resin powder as a thermosetting waste plastic, urea resin powder and a mixture of phenol resin powder and urea resin powder are sufficiently treated to remove dissolved oxygen and immersed in a styrene monomer solution containing a small amount of azobisisobutylnitrile. , The immersion-treated phenol resin powder, urea resin powder and a mixture of phenol resin powder and urea resin powder,
Place in a heating furnace and heat to about 100 ° C. for about 30 minutes.
The obtained solid matter was crushed by a crusher into small pieces having a size of about 1 mm or less, and the polystyrene molded articles collected as industrial waste were crushed and mixed with 500 g of waste polystyrene pellets obtained. It was observed that the mixture was a uniform mixture of small pieces derived from thermosetting waste plastic and waste polystyrene pellets.

Example 2: The thermosetting waste plastic-derived small pieces obtained in Example 1 and the waste polystyrene pellets were uniformly mixed, and the mixture was heated up to about 200 ° C. with a small manual injection molding machine. Heat treatment for about 3 minutes, thickness 4mm
Injection molded into a plastic plate. From this plastic plate, a plastic plate test body having a length of 80 mm, a width of 10 mm and a thickness of 4 mm was prepared. Bending tests were conducted on the plastic plates when phenol resin powder, urea resin powder and a mixture of phenol resin powder and urea resin powder were used as the thermosetting waste plastics, and the results are shown in Table 2. For comparison, plywood was prepared according to Japanese agricultural standards. The size of the plywood test piece is 80 mm long x 10 width
mm × thickness 4 mm was cut out and made the same size as the test piece of the plastic plate. A bending test was conducted in the same manner, and the results are shown in Table 2.

[0022]

[Table 2]

Bending strength is a very important physical property for the function of the formwork used in concrete formwork construction. As a result of the above, not only is the mechanical strength of the molded product of thermosetting waste plastic and waste polystyrene according to the present invention superior to that of thermoplastics, but it is also comparable to that of plywood. It was shown to be a level. In this way, it was confirmed that the plastic plate, which is a molded product of thermosetting waste plastic and waste polystyrene, can be replaced with plywood. Further, different kinds of thermosetting waste plastics can be treated and molded according to the present invention, and the resulting product does not have a decrease in mechanical strength, and its shape is not uneven, and plywood can be formed. The advantage is that you can get a comparable board.

Example 3: A mixture of the small pieces derived from the thermosetting waste plastic obtained in Example 1 and the waste polystyrene pellets was uniformly heated to about 300 ° C. for about 10 minutes and extruded. By processing, a simple flat plastic plate having a thickness of 15 mm was prepared. Similarly, about 200 pieces of the small pieces derived from the thermosetting waste plastic obtained in Example 1 and the waste polystyrene pellets were uniformly mixed.
Heat treatment up to ℃ for about 10 minutes, extrusion molding treatment,
A flat plate having a corrugated cardboard-like cross-sectional structure made of a plastic plate having a thickness of 4 mm was prepared. In addition, about 300 pieces of the thermosetting waste plastic-derived small pieces obtained in Example 1 and the waste polystyrene pellets are uniformly mixed.
The plate was heat-treated for about 10 minutes to 0 ° C., and then press-molded to prepare a ribbed plastic plate having a flat plate with a thickness of 10 mm. The shape of the plastic plate thus obtained is shown in FIG.

[0025]

EFFECTS OF THE INVENTION Thermosetting plastics that can be used only for a limited number of applications and that are discharged as waste plastic waste can be heated and remolded. By utilizing this property, they can be used as recycled raw materials, or as concrete materials for building civil engineering. The material cycle is performed by making it into a formwork used for formwork construction. Since it has greater mechanical strength than thermoplastics such as phenolic resin or urea resin, it can be used to manufacture formwork used for concrete formwork with excellent properties, and use of thermosetting waste plastic Can be expanded. By opening the way to use the thermosetting waste plastic by injection molding or extrusion molding, it is possible to manufacture a mold having excellent properties that can be used for mold construction. In addition, it becomes possible to mix different types of plastics to produce a product, and there is no problem that the mechanical strength of the product is lowered or the shape is irregular.

[Brief description of drawings]

FIG. 1 shows an example of a typical shape of a plastic plate which is a molded product of thermosetting waste plastic and waste polystyrene according to the present invention. (A) A simple flat plate, (b) a flat plate having a corrugated cardboard-shaped cross-sectional structure, and (c) a ribbed plastic plate.

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location E04G 9/05 7628-2E // C08J 11/00 CET 7310-4F B29K 105: 26

Claims (11)

[Claims] 1. A thermosetting waste plastic powder or a pulverized product of styrene or a polymerizable styrene derivative, which has been heat-treated in the presence of a polymerization initiator, at least on its surface, and a mixed solid product of the pulverized product is pulverized. Then, the pulverized product thus obtained is mixed with waste polystyrene and then heat-molded, which is a molded product comprising thermosetting waste plastic and waste polystyrene. 2. The molded product according to claim 1, wherein the molded product comprises a thermosetting waste plastic having a thermosetting waste plastic content of 20% or more and waste polystyrene. 3. The molded product according to claim 1, wherein the molded product comprises thermosetting waste plastic having a thermosetting waste plastic content of 50% or more and waste polystyrene. 4. The molded product according to claim 1, wherein the molded product is a concrete formwork construction formwork. 5. A thermosetting waste plastic powder is dipped in styrene or a polymerizable styrene derivative, heat-treated in the presence of a polymerization initiator, and then the obtained product is crushed. The crushed product thus obtained is discarded. The molded article according to claim 1, wherein the molded article is a mixture of polystyrene and heat molding. 6. A thermosetting waste plastic powder is immersed in a liquid of styrene or a polymerizable styrene derivative and heat-treated in the presence of a polymerization initiator, for example, at 80 ° C. or higher to heat the styrene or the polymerizable styrene derivative at least. It is characterized in that it is obtained by subjecting a surface of a curable waste plastic powder to an adhesion treatment, crushing the obtained product, and mixing the crushed product thus obtained with a waste polystyrene powder or a crushed product, followed by heat molding. The molded product according to claim 1. 7. A thermosetting waste plastic powder or pulverized product, at least the surface of which is treated with styrene or a polymerizable styrene derivative in the presence of a polymerization initiator, is mixed with waste polystyrene and heat-molded. A method for producing a molded article composed of waste thermosetting plastic and waste polystyrene. 8. The molded product according to claim 7, wherein the molded product is composed of the thermosetting waste plastic and the waste polystyrene when the content of the thermosetting waste plastic is 20% or more. A method for producing the described molded article. 9. A molded product produced from a thermosetting waste plastic and a waste polystyrene when the content of the thermosetting waste plastic is 50% or more. The method for producing a molded article according to item. 10. A thermosetting waste plastic powder is dipped in styrene or a polymerizable styrene derivative liquid, heat-treated in the presence of a polymerization initiator, and then the obtained product is pulverized. The pulverized product thus obtained is The method for producing a molded product according to claim 7, wherein the molded product is mixed with waste polystyrene and heat-molded. 11. A thermosetting waste plastic powder is immersed in styrene or a polymerizable styrene derivative liquid and heat-treated in the presence of a polymerization initiator, for example, at 80 ° C. or higher to heat the styrene or the polymerizable styrene derivative at least. Characterized in that the surface of the curable waste plastic powder is treated with adhesion, the product obtained is then crushed, and the crushed product thus obtained is mixed with the waste polystyrene powder or crushed product and heat-molded. The method for producing the molded product according to claim 7.