JPH0691648A - Material regenerating method - Google Patents

Abstract

PURPOSE:To provide a material generating method capable of regenerating sufficiently strong material without necessitating peeling work of paint film. CONSTITUTION:Member of polypropylene coated with urethane coating is crushed. A large number of crushed pieces 3 and water-soluble polymer 13 containing at least ethylene vinyl alcohol are put in a water tank 11 containing water 12 and stirred. The water is removed from this mixed liquid. By removing the water, solid new material having coat of the water-soluble polymer 13 formed on the surface of the crushed pieces 3 can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material recycling method for recycling automobile components.

[0002]

2. Description of the Related Art There are various resin moldings such as bumpers for shock absorption in automobiles. As a constituent member of these resin molded products, for example, as shown in FIG. 4, one in which urethane-based paint 2 is applied to the surface of polypropylene 1 is used.

When a bumper or the like is manufactured from such a member, a defective product may occur. In addition, when a vehicle is scrapped, the members forming the bumper are discarded without being reused.

In recent years, it has been strongly desired to reuse or so-called recycle the constituent members of automobiles due to environmental problems and the like. The same applies to resin molded products such as bumpers. If defective products or discarded products can be recycled, it will lead to improvement of environmental problems and reduction of material costs.

[0005]

In the case of regenerating automobile components into new materials, there is a method in which the components are crushed and added to new materials to make new materials.

However, even if a crushed product such as the bumper with the coating film (urethane-based coating material 2) still attached is added to the new material, the adhesion between the coating film and the new material is poor,
A new material with sufficient strength cannot be obtained.

On the other hand, the work of peeling off the coating film is troublesome and requires a large-scale facility, which causes a problem of cost increase.

The present invention takes the above circumstances into consideration,
It is an object of the invention to provide a material recycling method capable of recycling a material having sufficient strength without requiring a peeling operation of a coating film.

[0009]

The material recycling method of the present invention comprises crushing a polypropylene member coated with a urethane-based paint, and putting the crushed product and a water-soluble polymer containing at least ethylene vinyl alcohol in water. The mixture is stirred to remove water from the mixed solution, and the remaining material is used as a new material.

[0010]

Function A water-soluble polymer film is formed on the surface of many crushed products. These crushed products become solid new materials.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below.

It is assumed that a bumper is formed by using the members shown in FIG. Suppose this is a defective product or a scrap product.

In this case, the defective or scrap member is first crushed. Then, as shown in FIG. 1, a large number of pieces (referred to as crushed products) 3 obtained by crushing are put in a water tank 11. The water tank 11 contains water 12 in advance.

Then, the granular water-soluble polymer 13 is placed in the water tank 11 and waits for the water-soluble polymer 13 to dissolve in water. If necessary, reinforcing glass fiber 14 is added.

Once the water-soluble polymer 13 has melted, the water tank 11
The inside is stirred with a stirrer 15. After this stirring, the mixed solution in the water tank 11 is placed on a sheet of several μ mesh and evacuated,
Remove water.

When the water is removed, many solids remain on the sheet as new material. As shown in FIG. 2, these new materials are in a state in which a film of the water-soluble polymer 13 is formed on the surface of the crushed product 3.

A sheet on which this new material is placed is placed at 200 ° C. to 230 ° C.
By preheating to ℃, placing it on a press mold, and press-molding, automobile parts using recycled new materials can be made.

Since the water-soluble polymer 13 contains at least ethylene vinyl alcohol, it has good compatibility with the urethane and polypropylene constituting the crushed product 3, so that sufficient strength as a new material can be secured.

FIG. 3 shows the relationship between the impact resistance of the new material and the amount of the water-soluble polymer 13 added. If the amount of the pulverized product 3 is "100", the ratio is 30% to 70%. Optimally, an amount of water-soluble polymer 13 is added. That is, 30%
This is because sufficient impact resistance cannot be obtained with the following amounts, and impact resistance does not change even with an amount of 70% or more.

Thus, the pulverized product 3 is added to the water-soluble polymer 1
A new material having sufficient strength can be regenerated by a simple operation of adding and mixing 3, and a troublesome peeling operation of the coating film is unnecessary. Therefore, large-scale equipment for the peeling work is not required, and the cost increase can be avoided.

In the above embodiment, the recycling of the members constituting the automobile article has been described as an example, but members of other products can be similarly recycled as long as they have the same composition.

[0022]

As described above, according to the present invention, a polypropylene member coated with a urethane paint is crushed, and the crushed product and a water-soluble polymer containing at least ethylene vinyl alcohol are put in water and stirred. Then, water is removed from this mixed solution and the remaining material is used as a new material.
It is possible to provide a material recycling method capable of recycling a material having a sufficient strength without requiring a peeling operation of a coating film.

[Brief description of drawings]

FIG. 1 is a diagram showing a stirring state of a pulverized product and a water-soluble polymer according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a new material in the same example.

FIG. 3 is a graph showing the relationship between impact resistance of the new material and the amount of the water-soluble polymer added in the example.

FIG. 4 is a configuration diagram of an automobile constituent member according to the embodiment.

[Explanation of symbols]

1 ... polypropylene, 2 ... urethane paint, 3 ... crushed product, 13 ... water-soluble polymer.

Claims (1)

[Claims] 1. A polypropylene member coated with a urethane-based paint is crushed, and the crushed product and a water-soluble polymer containing at least ethylene vinyl alcohol are put in water and stirred to remove water from the mixed solution. A material recycling method characterized in that the remaining material is a new material.