JPH05301223A - Production of regenerated resin product using resin wastes - Google Patents

Abstract

PURPOSE:To economically obtain a regenerated resin product by omitting a process for removing foreign matters, such as a coating material, generating a noxious gas in thermal decomposition while preventing a generation of a malodorous gas in a molding process and deterioration of working environment. CONSTITUTION:Resin wastes made of a thermoplastic resin containing foreign matters generating a noxious gas in thermal decomposition are ground to particles. The particles are thermally molded as a regenerated resin product. At this time, the particles are mixed with an inorganic porous filler before being thermally molded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a resin recycled product using a resin waste, and more particularly to a method for producing a resin recycled product from a waste thermoplastic resin.

[0002]

2. Description of the Related Art Conventionally, a part of resin parts of an abandoned automobile is collected and manufactured as a resin recycled product. The resin parts to be recovered are, for example, bumpers, fenders, spoilers, etc., and most of them are made of thermoplastic resin, especially polypropylene resin. In addition, the collected resin parts are contaminants such as paints and resin stabilizers that thermally decompose to generate harmful gas (absent impurities that thermally decompose to generate harmful gas are
It is simply described as a contaminant. ) Is included. These foreign substances are thermally decomposed in a thermoforming process for obtaining a resin recycled product to generate a foul-smelling gas, deteriorating the working environment and deteriorating the quality of the molded product. Therefore, in the conventional production of recycled resin products, a step of removing the impurities is required. On the other hand, in recent automobile manufacturing, synthetic resin parts are often used to improve fuel efficiency and the weight of vehicle bodies is being reduced, and the proportion of synthetic resins, especially thermoplastic synthetic resins, used in automobiles is increasing. There is a demand for economical recovery of synthetic resin parts of this kind.

[0003]

However, in the production of the above-mentioned conventional resin recycled product, since the step of removing the impurities of the recovered resin parts is required before the molding step, the production process becomes complicated and There was a problem of increasing the production cost of recycled resin products.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art by preventing the generation of offensive odor gas in the molding process and without damaging the working environment.
Another object of the present invention is to provide a method for producing a resin reclaimed product, by which a resin reclaimed product can be economically obtained by omitting a step of removing contaminants such as paint.

[0005]

In order to achieve the above-mentioned object, the present invention crushes a resin waste of a thermoplastic resin containing a contaminant that thermally decomposes to generate a harmful gas into a crushed product, When the crushed product is thermoformed to obtain a resin recycled product, the crushed product is mixed with a porous inorganic filler and then thermoformed.

The resin waste is made of thermoplastic resin such as polyethylene, polypropylene, vinyl chloride or polycarbonate. The resin waste is crushed by an appropriate crushing means. The crushed product is molded into a resin recycled product mainly by extrusion molding or injection molding.

As the inorganic filler, a powder of a porous material such as activated carbon, silica gel, activated alumina, activated clay, diatomaceous earth, zeolite or talc, preferably a fine powder having a specific surface area of 10 m ² / g or more is used. The amount of the inorganic filler added is 1 to 50 with respect to the resin supplied to the thermoforming process.
(Weight)% is desirable. If the amount of the inorganic filler added is less than 1%, the malodor cannot be prevented in thermoforming, and if it is more than 50%, the quality of the molded product deteriorates. The inorganic filler may be directly added to the pulverized product and kneaded, or the inorganic filler may be mixed with a part of the thermoplastic resin in advance, and the inorganic filler may be used together with the pulverized product in a thermoforming step. ..

[0008]

When the crushed product is thermoformed, the porous inorganic filler acts to adsorb the pyrolyzed components generated from the contaminants.

[0009]

Example A scrapped automobile was disassembled and a polypropylene resin bumper was collected. The surface of this bumper is painted with urethane paint. Then, the bumper was crushed into a crushed product having a particle size of 3 to 10 mm. Then, fine powder of talc (specific surface area of 10 m ² / g or more) and the pulverized product were mixed with a blender to produce pellets of a mixed resin containing 35% of talc. Then, the mixed resin is extruded by an extrusion molding machine (screw temperature 1
65 ° C., die temperature 190 ° C.) to obtain a sheet having a width of 1800 mm and a thickness of 2.5 mm.

On the other hand, as a comparative example, in the same extruder, with respect to 1.00 part by weight of the crushed product of the bumper,
A sheet was similarly formed from a mixture prepared by mixing 0.65 parts by weight of a talc-free polypropylene resin.

The above-described Examples and Comparative Examples were each performed twice, and the air around the extruder was sampled to compare the odor concentrations of the Examples and Comparative Examples. The comparison of the odor concentration was evaluated by the three-point comparison type odor bag method (relative ratio). Further, the elastic modulus of both sheets was measured for the purpose of quality comparison of the sheets of the example and the comparative example. The results are shown in Table 1.

[0012]

As is clear from Table 1, the sheet of this example produced less odor in the molding process, did not cause discomfort, and did not impair the working environment, as compared with the comparative example.
Further, the elastic modulus of the sheet of this example was higher than that of the comparative example, and it was confirmed that the quality was good.

[0014]

INDUSTRIAL APPLICABILITY According to the present invention, when a resin waste containing impurities is thermoformed to produce a resin reclaimed product, a porous inorganic filler is mixed and then thermoformed, so that a harmful gas generated during thermoforming is produced. Can be adsorbed and removed by a porous inorganic filler and does not harm the working environment. That is, according to the present invention, unlike the conventional method, the step of removing foreign matters is not required, which is advantageous in that a resin recycled product can be economically obtained.

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Claims (1)

[Claims] 1. A pulverized product is obtained by pulverizing a resin waste of a thermoplastic resin containing a contaminant that is thermally decomposed to generate a harmful gas,
A process for producing a resin recycled product, which comprises thermoforming the crushed product after thermoforming the crushed product, after mixing a porous inorganic filler with the crushed product.