JP3341129B2 - Molded product made of waste plastic and its production - Google Patents

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 producing a formwork used for concrete formwork. The present invention particularly relates to a thermosetting waste plastic powder obtained by heat-treating in the presence of a polymerization initiator to obtain styrene or a polymerizable styrene derivative adhered to at least the surface thereof, or a thermosetting waste plastic powder obtained by grinding. Or pulverize a mixed solid consisting of pulverized material and polystyrene, mixing the pulverized material thus obtained with waste polystyrene, and thermosetting waste plastic and waste polystyrene characterized by being molded by heating Molded articles.
In particular, the present invention provides a thermosetting waste plastic having a content of 2%.
The present invention relates to a molded product composed of waste thermosetting plastic and waste polystyrene of 0% or more, and further relates to a technique of using the same as a frame material for manufacturing a mold used for concrete formwork.

According to the present invention, the waste thermosetting plastic powder is further immersed in a styrene or polymerizable styrene derivative solution, heat-treated in the presence of a polymerization initiator, and then the obtained product is pulverized. The present invention relates to a method for producing a molded product comprising a thermosetting waste plastic and a waste polystyrene, which comprises mixing a pulverized product with a waste polystyrene and subjecting the mixture to heat molding. More specifically, the present invention relates to a method of immersing a thermosetting waste plastic powder in a styrene or polymerizable styrene derivative solution and performing a heat treatment in the presence of a polymerization initiator, for example, a heat treatment at 80 ° C. or higher, to obtain a styrene or polymerizable A styrene derivative is adhered to at least the surface of the thermosetting waste plastic powder, and the resulting product is pulverized.The obtained pulverized product is mixed with the waste polystyrene powder or the pulverized product, and then subjected to heat molding. The present invention relates to a method for producing a molded article composed of waste thermosetting plastic and waste polystyrene, and a formwork used for constructing a concrete form produced by the method.

[0003]

2. Description of the Related Art In recent construction work, concrete formwork has been widely used. However, concrete formwork has been widely used for manufacturing formwork used for concrete formwork. As a frame material, a raw material of a tropical forest such as Lauan is often used as a raw material. In fact, about 60% of the formwork material used in concrete formwork is Lauan plywood manufactured from Lauan. This plywood is made by laminating boards that are thinly peeled and glued together, so that the wood fibers are continuous and are strong against bending and pulling forces received when used as a formwork. It has the property of being hard and having little bending deformation. However, it is still difficult to say that they have sufficient strength and elastic modulus, and there is a demand for development of a material having better properties. The use of raw wood obtained from tropical forests such as Lauan as a raw material conserves the global environment and prevents, or prevents, environmental degradation from occurring. Is strongly required. From such a viewpoint, development of an alternative form using a new material instead of a wooden form has been strongly promoted.

The following are examples of such alternative molds. 1. 1. Particleboard reinforced with mesh-like fibers using wood from scraps from sawmills and demolition materials from houses. Utilizing a large amount of plant fiber contained in low-grade waste paper,
2. A board manufactured by drying and defibrating the used paper, subjecting it to a chemical treatment, mixing additives, and heating and compressing the obtained material to form a molded article; Polypropylene board reinforced with fiber using virgin material. Although these alternative forms have been partially utilized,
The mainstream of these alternative forms is the recycling of waste wood, used paper, etc. as materials. In recent years, the amount of garbage discharged as waste plastic has been increasing significantly, and the amount is about 500 per year.
It amounts to 10,000 tons, and the amount is also increasing. 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 households is about 3 million tons.

[0005] Among these waste plastics, thermoplastic waste plastics can be melted and restored to the original state by applying heat, so that they can be heated and molded. Approximately 27% of industrial waste that can be easily collected as thermoplastic waste plastic is used as a recycled material, processed again into the original product, or made into piles, rods, plates, etc. as building civil engineering materials. , The material cycle has been done. However, thermosetting plastics are such that the molecules take on a three-dimensional network structure, and those once molded into a product from a raw material have a three-dimensional network structure and can be deformed even when heat is applied again. Therefore, the way of recycling what was recovered as waste plastic is limited to the use of finely crushing the waste and mixing it as a filler for the same type of plastic. I have. Thus, thermosetting waste plastics can be used only for limited applications, but the mixing ratio is about 2%.
There is also a problem that it can be blended only up to about 0%. For this reason, most waste plastics made of thermosetting plastics currently have to be landfilled or disposed of by incineration. Such a thermosetting waste plastic is reused from the viewpoint of global environment conservation and effective use of resources.
The development of applications is an urgent and important issue.

[0006] By the way, typical examples of thermosetting plastics include phenolic resins and urea resins. However, as shown in Table 1 below, since they have a higher mechanical strength than thermoplastics, they can be used as recycled materials. If it can be reused for the production of alternative forms for concrete formwork, its use value is considered to be very large. Also, among the thermoplastics, polystyrene has relatively high mechanical strength, and it is considered that the value of this material is very large if it can be reused as a recycled material in the production of alternative molds.

[0007]

[Table 1]

However, there has never been provided any alternative formwork for concrete formwork in which these waste plastics are reused. The present inventors examined the use of waste polystyrene among thermosetting waste plastics and thermoplastics, used the crushed thermosetting waste plastic as a filler for waste polystyrene, and used the recycled material thus obtained. If it could be used for the production of alternative formwork, it would be possible to produce formwork used for the construction of concrete forms with excellent properties and expand the use of waste thermosetting plastics. Diligently developed. However, when 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 set to 20% or more,
Compounds consisting of these thermosetting waste plastic powders and waste polystyrene pellets cannot be made into a uniform mixture, forming a so-called "dama", which makes it impossible to perform injection and extrusion smoothly. In addition, heat molding, which is indispensable for using plastic, cannot be performed. In fact, injection molding and extrusion molding cannot be performed on the thermosetting waste plastic powder mixed with the thermoplastic as it is, making it impossible to produce a mold with excellent properties that can be used for formwork. Was. In addition, there is also a problem in that, when an attempt is made to produce a product by mixing different types of plastics, the mechanical strength of the product is reduced or the shape is not uniform. As described above, it has not been possible to use a thermosetting waste plastic powder as a filler for a thermoplastic waste plastic such as waste polystyrene.

[0009]

Means for Solving the Problems The present inventors have made intensive research and development to solve the above-mentioned obstacles or problems by a simple method, and as a result, have accomplished the present invention. That is,
The present invention heat-treats in the presence of a polymerization initiator, and pulverizes a thermosetting waste plastic powder or a mixed solid material composed of polystyrene and a thermosetting waste plastic powder or a pulverized material, on which at least styrene or a polymerizable styrene derivative is adhered. ,
The molded product obtained by mixing the pulverized material thus obtained with waste polystyrene and thermoforming the molded product is characterized by being a thermosetting waste plastic and waste polystyrene. In particular, the present invention relates to a molded article comprising waste thermosetting plastic having a thermosetting waste plastic content of 20% or more and waste polystyrene. According to the present invention, furthermore, the thermosetting waste plastic powder is immersed in styrene or a polymerizable styrene derivative, heat-treated in the presence of a polymerization initiator, and then the obtained product is pulverized. Provided is a molded product comprising waste thermosetting plastics and waste polystyrene, which is mixed with polystyrene and heat molded. More specifically, the present invention relates to a method of immersing a thermosetting waste plastic powder in styrene or a polymerizable styrene derivative liquid, and then subjecting the obtained polymerizable styrene-treated thermosetting waste plastic powder to a polymerization initiator in the presence of a polymerization initiator. A heat treatment, for example, a heat treatment at 80 ° C. or higher, a styrene or a polymerizable styrene derivative adhered to at least the surface of the thermosetting waste plastic powder, and the obtained product is pulverized. There is also provided a molded product comprising waste thermosetting plastic and waste polystyrene, which is mixed with waste polystyrene powder or pulverized material and heat-molded.

[0010] The present invention is characterized in that a thermosetting waste plastic powder or pulverized product, at least the surface of which has been treated with styrene or a polymerizable styrene derivative in the presence of a polymerization initiator, is mixed with waste polystyrene, and then heat-molded. The present invention relates to a method for producing a molded product comprising a thermosetting waste plastic and waste polystyrene. In particular, the present invention relates to a method for producing a molded article comprising a thermosetting waste plastic and waste polystyrene when the content of the thermosetting waste plastic is set to 20% or more, for example, 50% or more. Related to The present invention further comprises immersing the thermosetting waste plastic powder in a styrene or polymerizable styrene derivative solution, performing a heat treatment in the presence of a polymerization initiator, pulverizing the resulting product, and crushing the thus obtained pulverized product. There is also provided a method for producing a molded product comprising waste thermosetting plastic and waste polystyrene, which is characterized by being mixed with waste polystyrene and heat-molded. More specifically, the present invention relates to a method of immersing a thermosetting waste plastic powder in styrene or a polymerizable styrene derivative solution and performing a heat treatment in the presence of a polymerization initiator, for example, a heat treatment at 80 ° C. or higher, and the styrene or polymerization sex styrene derivatives by adhering process at least on the surface of the thermosetting plastic waste powder, and then the resulting product was ground and the thus obtained pulverized product was mixed with the waste polystyrene powder, or ground product, a heating molding The present invention relates to a method for producing a molded product composed of waste thermosetting plastic and waste polystyrene.

Examples of the thermosetting waste plastic include those obtained by pulverizing molded products such as epoxy resin, silicone resin, unsaturated polyester resin, phenol resin, and urea resin, and those having relatively high mechanical strength are preferable. Used. These thermosetting waste plastics may be composed of miscellaneous mixtures classified as thermosetting plastics among waste plastics collected as industrial waste or garbage discharged from households. It may include waste plastics other than those to be classified, and those whose majority of the components are thermosetting plastics. Preferable examples of the thermosetting waste plastic which can be used here include those obtained by pulverizing molded products such as phenolic resins and urea resins. The phenolic resin refers to a resin obtained by a condensation reaction between a phenol and an aldehyde. Examples of the phenol include phenol and phenol.
Meta-para-cresol, xylenol, bisphenol A, bisphenol F, meta-tert-butylphenol, resorcin, and the like, and the aldehydes include, for example, formaldehyde, paraformaldehyde, acetaldehyde, propionaldehyde, and the like. Components may be included. Urea resins include those obtained by the condensation reaction of ureas and aldehydes.Examples of the ureas include unsubstituted ureas, mono- or dialkyl-substituted ureas, and mono- or diaryl-substituted ureas. Include, for example, formaldehyde, paraformaldehyde, acetaldehyde, propionaldehyde, and the like, but may contain other components. As the thermosetting waste plastic, those obtained by pulverizing a molded product of a phenol resin and those obtained by pulverizing a molded product of a urea resin may be used alone or may be used by mixing them at an appropriate ratio. . As the thermosetting waste plastic used here, those containing phenolic resin-derived products or urea resin-derived products in a form as uniform as possible should have the properties of the final product constant. Is more preferred.

In the present invention, a pulverized product obtained by pulverizing a thermosetting waste plastic powder or molded article is treated with styrene or a polymerizable styrene derivative. Here, the term "polymerizable" means having a group that can be polymerized by heating in the presence of the following polymerization initiator, and for example, has a group that can react with a radical generated by thermal decomposition such as a peroxide molecule. Therefore, the polymerizable monomer having the same function is not limited to styrene or a polymerizable styrene derivative,
It can be used without departing from the purpose of the present invention. Examples of the styrene and the polymerizable styrene derivative include a styrene monomer, an alkyl-substituted styrene, and a halogeno-substituted styrene, and a styrene monomer is preferably used. When a styrene monomer is used as the treating agent, the thermosetting waste plastic is treated by dipping in the styrene monomer. In this treatment, it is sufficient that styrene or a polymerizable styrene derivative is substantially adhered to the surface of at least a pulverized product obtained by pulverizing a thermosetting waste plastic powder or a molded product. When processing thermosetting waste plastic,
In some cases, it is desirable for a treating agent such as a styrene monomer to remove oxygen dissolved therein in advance.

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

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

[0015] The mixed solid comprising the thermosetting waste plastic and polystyrene is pulverized by an ordinary method to obtain a pulverized product of powder or small pieces. The mixed solid composed of the pulverized thermosetting waste plastic and polystyrene is mixed with waste polystyrene. Mixing can be done well. The mixing of the waste solid with the mixed solid consisting of the crushed thermosetting waste plastic and the polystyrene can be uniformly mixed with the waste polystyrene even if the content of the thermosetting waste plastic is 50% or more. It does not cause a substantial problem in the distribution of the two components in the recycled product molded article in the subsequent heat molding treatment. When a mixture of the waste solid and the mixed solid consisting of the crushed thermosetting waste plastic and polystyrene and the waste polystyrene is heated, the crushed thermosetting waste plastic functions as a filler, and the polystyrene portion functions as an adhesive. Then, the thermosetting waste plastics are also adhered to each other and can be molded. In this mixture of waste thermosetting plastic and waste polystyrene, styrene is chemically bonded to or around the thermosetting waste plastic molecules and also around the thermosetting waste plastic powder, thereby forming the thermosetting waste plastic. It is believed that the plastic and waste polystyrene blend together to form a heat moldable mixture. Thus, it will be appreciated that as long as such a mechanism is utilized, the starting raw materials used are available without limitation.

Examples of the waste polystyrene include pulverized polystyrene products such as multipurpose polystyrene and impact polystyrene, and those having relatively high mechanical strength are preferably used. These waste polystyrenes may include a styrene resin composed of acrylonitrile / styrene, a styrene resin composed of acrylonitrile / butadiene / styrene, and the like. These polystyrenes may be composed of miscellaneous mixtures classified as thermoplastic waste plastics among waste plastics recovered as industrial waste or garbage discharged from homes, and the majority of the composition is polystyrene. Things may be included. Preferable examples of the waste polystyrene usable here include pulverized polystyrene molded products such as waste polystyrene pellets. As the waste polystyrene, one obtained by pulverizing a molded product of multipurpose polystyrene or one obtained by pulverizing a molded product of impact-resistant polystyrene may be used alone, or may be used by mixing them at an appropriate ratio. As the waste polystyrene to be used here, a material obtained from a resin molded product and containing polystyrene in a form as uniform as possible is used.
It is more preferred that those give a property of the final product as well.

The mixing ratio of the thermosetting waste plastic and the waste polystyrene is desirably a large amount of the thermosetting waste plastic whose use has been limited so far. The amount can be blended by 20% or more by weight. According to the present invention, the mixing amount of the waste thermosetting plastic can be increased as long as the mechanical properties of the obtained thermoformed product are not reduced or the thermoforming process is not adversely affected. More than 50% by weight of the waste plastic can be blended. Even if the amount of the thermosetting waste plastic is mixed by 50% or more with respect to the whole, there is no problem in the heat molding process, and a molded article having excellent properties can be obtained. As the heat molding method, an ordinary plastic molding method can be applied, and for example, it can be performed by a method such as a compression molding method, an injection molding method, or an extrusion molding method. In the compression molding method, a multi-stage press or continuous molding such as using a rotary table, impact compression molding, ultrasonic compression molding, hydraulic molding, etc. are appropriately selected according to the purpose, and the molding process is performed. . In the injection molding method, there are those using a plunger type injection molding machine including an in-line screw type,
A method using an injection molding machine controlled by a program may be used. In the injection molding, heat molding can be performed as a composite material such as FRP. In adding the heat molding process, foam molding can also be performed.

According to the present invention, a mixture of a crushed material obtained from a mixed solid consisting of a thermosetting waste plastic and polystyrene and a waste polystyrene is subjected to a heat molding treatment, and a mold used for concrete formwork construction. Frames can be manufactured. The mold obtained in this manner may be a simple flat plastic plate, a flat plate obtained by laminating simple flat plates in multiple layers, or a flat plate having a corrugated cardboard cross-sectional structure composed of a plastic plate. Alternatively, a ribbed plastic plate having a flat plate may be used. According to the present invention, a plate suitable for a formwork used in concrete formwork using a mixture of waste polystyrene and a pulverized product obtained from a mixed solid consisting of a thermosetting waste plastic and polystyrene. It can be manufactured simply and inexpensively and on an industrial scale. A foaming agent may be added to the plastic plate during the heat forming process, and the plastic plate may be heated and foamed after molding to obtain a lightweight plastic plate.

Various foaming agents are known. Decomposed foaming agents and volatile foaming agents are known.
As the decomposition type foaming agent, a decomposition temperature, an amount of generated gas, a diffusivity to a substrate, a corrosiveness of the decomposition gas, and the like are selected and used from preferable ones, and sodium bicarbonate, ammonium carbonate, ammonium bicarbonate, Ammonium nitrite,
Azide compounds, sodium borohydride, light metals (magnesium, zinc, aluminum, etc.), azodicarbonamide, azobisformamide, azobisisobutylnitrile, diazoaminobenzene, N, N'-dinitropentamethylenetetramine, N, N ' -Dimethyl N, N '
-Dinitrone terephthalamide, benzenesulfonyl hydrazide, paratoluenesulfonyl hydrazide, oxybisbenzenesulfonyl hydrazide and the like.
As volatile foaming agents, pentane, neopentane, hexane, isohexane, heptane, isoheptane, benzene, toluene, dichloromethylene, trichloroethylene, dichloroethane, dichlorotetrafluoroethane,
Trichlorofluoromethane and the like. These foaming agents can be appropriately selected from commercially available ones and known general ones depending on the purpose of use of the final product.

[0020]

Next, the present invention will be described in detail with reference to examples. Example 1 Pulverized phenolic resin and urea resin molded products collected as industrial waste were used as thermosetting waste plastics. A phenol resin powder, a urea resin powder, and a mixture of a phenol resin powder and a urea resin powder as a thermosetting waste plastic are sufficiently immersed in a styrene monomer liquid containing a small amount of azobisisobutylnitrile after a treatment for removing dissolved oxygen. Each of the immersion-treated phenol resin powder, urea resin powder and a mixture of the phenol resin powder and the urea resin powder,
Place in a heating furnace and heat to about 100 ° C. for about 30 minutes.
The obtained solid was crushed by a crusher to form small pieces having a size of about 1 mm or less, and mixed with 500 g of waste polystyrene pellets obtained by crushing a polystyrene molded product collected as industrial waste. 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 small pieces derived from the thermosetting waste plastic obtained in Example 1 and the waste polystyrene pellets were uniformly mixed, and the mixture was heated to about 200 ° C. using a small manual injection molding machine. Heat treatment for about 3 minutes, thickness 4mm
Injection molded on a plastic plate. From this plastic plate, a plastic plate specimen having a length of 80 mm × a width of 10 mm × a thickness of 4 mm was prepared. A bending test of a plastic plate was performed using each of phenol resin powder, urea resin powder, and a mixture of phenol resin powder and urea resin powder as the thermosetting waste plastic, and the results are shown in Table 2. For comparison, plywood was prepared according to Japanese Agricultural Standards. The size of the plywood specimen is 80mm long x 10 wide
The test piece was cut into a piece having a size of 4 mm × 4 mm and the same size as the test piece of the plastic plate. A bending test was performed 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 a formwork used in concrete formwork. As a result of the above, the mechanical strength of the molded article composed of the waste thermosetting plastic and the waste polystyrene according to the present invention is not only superior to the mechanical strength of the thermoplastic but also comparable to that of plywood. Level was shown. Thus, it was confirmed that a plastic plate, which is a molded product composed of waste thermosetting plastic and waste polystyrene, can be replaced with plywood. In addition, different types of thermosetting waste plastics can be processed and molded according to the present invention, and the resulting products can be formed into plywood without any reduction in mechanical strength and without any irregularities in the shape. There is an advantage that a comparable plate can be obtained.

Example 3 A piece obtained by uniformly mixing small pieces derived from the thermosetting waste plastic obtained in Example 1 and waste polystyrene pellets is 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, a mixture obtained by uniformly mixing small pieces derived from waste thermosetting plastic obtained in Example 1 and waste polystyrene pellets was used for about 200 hours.
℃ to about 10 minutes, extruded,
A flat plate having a cardboard-like cross-sectional structure composed of a plastic plate having a thickness of 4 mm was prepared. Further, about 300 pieces of the thermosetting waste plastic-derived small pieces obtained in Example 1 and waste polystyrene pellets were uniformly mixed.
C. for about 10 minutes, followed by press molding to produce a 10 mm thick flat plate with ribs. FIG. 1 shows the shape of the plastic plate thus obtained.

[0025]

According to the present invention, a thermosetting plastic which can be used only for a limited purpose and which is discharged as waste plastic waste can be heated and remolded. By utilizing this property, it can be used as a recycled material, or as a material for building civil engineering. Forming is used for formwork, and a material cycle is performed. Higher mechanical strength compared to thermoplastics such as phenolic resin and urea resin, so it is possible to manufacture formwork used for concrete formwork with excellent properties, and use thermosetting waste plastic Can be expanded. This opens the way to use thermosetting waste plastics by injection molding or extrusion molding, and makes it possible to produce molds having excellent properties that can be used for moldwork. In addition, a product can be made by mixing different types of plastics, and there is no problem that the mechanical strength of the product is reduced or the shape is not uniform.

[Brief description of the drawings]

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

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-296364 (JP, A) JP-A-5-8239 (JP, A) JP-A-4-8510 (JP, A) JP-A-6-106 23751 (JP, A) JP-A-5-280195 (JP, A) JP-A-58-24412 (JP, A) JP-A-5-3485 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29B 17/00-17/02 C08J 11/00-11/28

Claims (11)

(57) [Claims] 1. A heat treatment in the presence of a polymerization initiator to pulverize a thermosetting waste plastic powder or a mixed solid consisting of a pulverized product and polystyrene having at least styrene or a polymerizable styrene derivative adhered to the surface thereof. A molded product comprising waste thermosetting plastic and waste polystyrene, characterized in that the pulverized product obtained in this way is mixed with waste polystyrene and molded by heating. 2. The molded article according to claim 1, wherein the molded article comprises a thermosetting waste plastic having a thermosetting waste plastic content of 20% or more and waste polystyrene. 3. The molded article according to claim 1, wherein the molded article comprises a 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. 5. A thermosetting waste plastic powder is immersed in styrene or a polymerizable styrene derivative, heat-treated in the presence of a polymerization initiator, and then the obtained product is pulverized. The molded article according to claim 1, wherein the molded article is mixed with polystyrene and molded by heating. 6. A thermosetting waste plastic powder is immersed in a styrene or polymerizable styrene derivative solution and heat-treated at 80 ° C. or more in the presence of a polymerization initiator to convert styrene or the polymerizable styrene derivative into at least the thermosetting waste plastic. 2. The method according to claim 1, wherein the surface of the powder is subjected to an adhesion treatment, the obtained product is pulverized, and the obtained pulverized product is mixed with waste polystyrene powder or pulverized product and heat-molded. The molded article according to the above. 7. A thermosetting waste plastic powder or pulverized material, at least the surface of which has been 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 product composed of waste thermosetting plastic and waste polystyrene. 8. A molded article comprising a thermosetting waste plastic and a waste polystyrene when the content of the waste thermosetting plastic is 20% or more. A method for producing the molded article according to the above. 9. A molded article for producing a molded article comprising waste thermosetting plastic and waste polystyrene when the content of the waste thermosetting plastic is 50% or more. A method for producing a molded article according to the above item. 10. A thermosetting waste plastic powder is immersed in a styrene or polymerizable styrene derivative solution, heat-treated in the presence of a polymerization initiator, and then the obtained product is pulverized. 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 a styrene or polymerizable styrene derivative liquid and heat-treated at 80 ° C. or higher in the presence of a polymerization initiator to convert styrene or the polymerizable styrene derivative into at least the thermosetting waste plastic. on the surface of the powder by adhering process, then the resulting product was ground and the thus obtained pulverized product was mixed with the waste polystyrene powder, or ground product, according to claim 7, wherein, characterized in that hot forming Manufacturing method of molded product.