JP2643643B2 - Recycling method of thermoplastic resin parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for regenerating a thermoplastic resin component used when reusing a thermoplastic resin component used for a bumper of an automobile, and more particularly to a thermosetting resin paint. The present invention relates to a method for regenerating a thermoplastic resin component coated with a resin.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 11, when a component made of a thermoplastic resin such as polypropylene, for example, an unpainted bumper of an automobile has a defect such as a scratch in a manufacturing process 51 thereof, the process is performed. After the defective unpainted bumper is finely pulverized by a pulverizer in 52, the pulverized material is mixed with a virgin material (thermoplastic resin material) in step 53 to make it reusable. In step 54, the bumper is re-used by an injection molding machine. Had to be molded.

[0003]

However, if a thermoplastic resin component coated with a paint made of a thermosetting resin, for example, a defective defective colored bumper of an automobile is to be reused by the above-described conventional recycling method, the mutual The thermoplastic resin and the thermosetting resin having low compatibility and affinity between them are mixed, and it is expected that the strength is reduced and the appearance is poor due to separation of the microphase. Then, there is a problem that it is difficult to reuse the defective colored bumper, and it has been a conventional problem to solve these problems.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and is intended to remove defective thermoplastic resin parts coated with a paint made of a thermosetting resin in such a state that they can withstand reuse. It is an object of the present invention to provide a method for recycling a thermoplastic resin component that can be recycled.

[0005]

SUMMARY OF THE INVENTION According to the present invention, when reusing a thermoplastic resin part coated with a thermosetting resin paint, the coated thermoplastic resin part has a maximum length of 5 mm or less. After being crushed into crushed pieces to form a recycled material, the recycled material is mass percentage 10 wt.
% Of glass fiber mixed with recycled thermoplastic resin material for recycling, and is characterized in that such a method for recycling thermoplastic resin parts solves the above-mentioned conventional problems. And means for doing so.

When a recycled product having higher strength is required, the mass percentage of the recycled material obtained by pulverizing the thermoplastic resin component into the recycled thermoplastic resin material does not exceed 50 wt%. It is desirable to do so.

[0007]

According to the method for regenerating a thermoplastic resin part according to the present invention, a crushed piece such as an ellipsoid or a sphere having a length of 5 mm or less at the longest dimension of a thermoplastic resin part coated with a thermosetting resin paint. After pulverizing the recycled material into a recycled thermoplastic resin material containing glass fibers exceeding at least 10 wt% by mass, as shown in the circle of FIG. The unreacted hydroxyl group or carbonyl group of the paint forms a strong hydrogen bond with the hydroxyl group on the surface of the glass fiber 13 on the side of the thermoplastic resin material for regeneration, thereby forming a binder between the glass fiber 13 and the thermoplastic resin 12. Will play a major role in the production of recycled products that can withstand reuse.
Further, it can be expected that the overall strength is increased by several percent compared with the virgin product.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIGS. 1 to 5 show one embodiment of a method for regenerating a thermoplastic resin part according to the present invention.

FIG. 2 shows a colored bumper as a thermoplastic resin part coated with a thermosetting resin paint.
In this case, the colored bumper 1, as shown in FIG.
A bumper main body 2 made of polypropylene having high rigidity is coated with an acrylic / melamine-based top coating 4 as a thermosetting resin coating via an undercoat 3.

As shown in FIG. 1, when a defect such as a scratch occurs in the colored bumper 1 in the manufacturing process A of the colored bumper 1 and becomes a defective product, first, in the process B, a defective colored bumper is produced by a pulverizer. 1 is crushed into crushed pieces such as ellipsoids and spheres of 5 mm or less at the longest dimension. Next, the coated polypropylene (recycled material) 1A obtained in the step B is used in the step C in this embodiment.
In the intermediate layer of the glass long fiber reinforced stampable sheet, a mass percentage of 20 wt% is mixed and regenerated,
In step D, the glass long fiber reinforced stampable sheet 10 shown in FIG. 5 is formed. As shown in FIG. 4, when the melt polypropylene 12 extruded from the extruder 21 of the stamping molding device 20 passes through the heating unit 22 and the cooling unit 23, the glass fiber reinforced stampable sheet 10 13 has a five-layer structure formed by sandwiching it sequentially with a polypropylene mat 14. The coated polypropylene 1 </ b> A is mixed with the melt polypropylene 12 to form the intermediate layer 11.

In order to confirm the performance of the glass long fiber reinforced stampable sheet 10 thus obtained, the bending elastic modulus Ea, the glass fiber content and the recycled material of the glass long fiber reinforced stampable sheet 10 (recycled product) were determined. When the relationship with the mixing ratio was examined, the result shown in FIG. 6 was obtained. As can be seen from FIG. 6, the glass fiber content was 1
In a range of 0 wt% or more and a recycled material mixing ratio not exceeding 50 wt%, the bending elastic modulus Ea of the glass long fiber reinforced stampable sheet 10 is such that the coated polypropylene 1A is not mixed with the glass long fiber reinforced stampable sheet ( (Virgin product), which was higher than the flexural modulus Ea, and it was confirmed that the flexural modulus could be improved.

Further, when the glass fiber content was 40 wt% and the recycle material mixing ratio was 20 wt%, the longest dimension of the crushed piece of the coated polypropylene 1A was changed to examine the relationship between the flexural modulus and the dimension. The result shown in FIG. 7 was obtained. As can be seen from FIG. 7, it was confirmed that when the size was 5 mm or less, the mixed state was good and the flexural modulus showed a high value.

FIG. 8 shows another embodiment of the method for regenerating a thermoplastic resin part according to the present invention, in which a colored bumper 3 as a thermoplastic resin part coated with a thermosetting resin paint is used.
1 shows a partial cross section.

In the colored bumper 31, the bumper body 32 is made of soft polypropylene,
The bumper main body 32 is coated with a metallic paint 35 as a thermosetting resin paint via an undercoat 33 and an intermediate paint 34.

In this embodiment, when a defect such as a scratch occurs in the colored bumper 31 in the manufacturing process (process A) of the colored bumper 31 and becomes a defective product, first, as in the above-described embodiment, a pulverizer is used. Thus, the defective colored bumper 31 is crushed into crushed pieces such as ellipses and spheres of 5 mm or less where the dimension is the longest (step B). Next, the coated polypropylene obtained in the above step was applied to the intermediate layer of the glass long fiber reinforced stampable sheet in a mass percentage of 20 wt%.
% Of the glass long fiber reinforced stampable sheet (Step D).

Also in this case, in order to confirm the performance of the glass long fiber reinforced stampable sheet, the bending elastic modulus Ea of the glass long fiber reinforced stampable sheet (recycled product), the glass fiber content rate, and the recycled material mixing rate were determined. When the relationship was examined, the result shown in FIG. 9 was obtained. As can be seen from FIG. 9, even in the glass long fiber reinforced stampable sheet of this example, the glass fiber content was 10 wt%.
As long as the above and the recycled material mixing ratio does not exceed 50 wt%, the bending elastic modulus Ea of the glass long fiber reinforced stampable sheet does not include the coated polypropylene, and the glass long fiber reinforced stampable sheet (virgin product) It was confirmed that the bending elastic modulus was higher than that of the stampable sheet 10 reinforced with long glass fiber of the previous example.

Therefore, in the method for regenerating a thermoplastic resin part according to the present invention, regardless of the type of the thermoplastic resin used for the thermoplastic resin part and the type of the thermosetting resin used for the thermosetting resin paint, It has been proved that it is possible to recycle plastic resin parts.

[0019]

As described above, in the method for regenerating a thermoplastic resin part according to the present invention, the coated thermoplastic resin part is pulverized into crushed pieces of 5 mm or less at the longest dimension to obtain fine particles. After the recycled material is used, the recycled material is mixed with a recycled thermoplastic resin material containing a glass fiber having a mass percentage of 10 wt% or more and is reused. Therefore, the recycled material is coated with a paint made of a thermosetting resin. This makes it possible to regenerate defective thermoplastic resin parts in a state where they can be reused, thereby providing a very excellent effect that it can greatly contribute to the preservation of the global environment.

[Brief description of the drawings]

FIG. 1 is a process block diagram showing an embodiment of a method for regenerating a thermoplastic resin part according to the present invention when regenerating a colored bumper (thermoplastic resin part).

FIG. 2 is a perspective view showing the colored bumper of FIG. 1;

FIG. 3 is a partially enlarged sectional view of the colored bumper of FIG. 2;

FIG. 4 is a side view schematically showing a stamping forming apparatus for forming the long glass fiber reinforced stampable sheet of FIG.

FIG. 5 is a partially enlarged sectional view of the glass long fiber reinforced stampable sheet of FIG. 1;

FIG. 6 shows the relationship between the bending elastic modulus, glass fiber content, and recycled material mixing ratio of the glass long fiber reinforced stampable sheet (recycled product) shown in FIG. 1 by using a glass long fiber reinforced stampable sheet (virgin product). 4 is a graph shown in comparison with the flexural modulus of the present invention.

FIG. 7 is a graph showing the relationship between the flexural modulus of the glass long fiber reinforced stampable sheet (recycled product) shown in FIG. 1 and the length of the recycled material.

FIG. 8 is a partially enlarged cross-sectional view of a metallic painted colored bumper (thermoplastic resin part) showing another embodiment of the method for regenerating a thermoplastic resin part according to the present invention.

9 is a graph showing the relationship between the bending elastic modulus, glass fiber content, and recycled material mixing ratio of a glass long fiber reinforced stampable sheet (recycled product) obtained by recycling the colored bumper shown in FIG. It is a graph shown in comparison with the bending elastic modulus of a fiber reinforced stampable sheet (virgin product).

FIG. 10 is an explanatory view of the operation of the method for regenerating a thermoplastic resin part according to the present invention.

FIG. 11 is a process block diagram when regenerating a non-painted bumper (thermoplastic resin component) showing a conventional method for regenerating a thermoplastic resin component.

[Explanation of symbols]

1 31 Colored bumper (thermoplastic resin part) 1A Painted polypropylene (recycled material) 4 Top coat paint (thermosetting resin paint) 10 Glass long fiber reinforced stampable sheet (recycled thermoplastic resin material) 11 Glass long fiber reinforced stamper Middle layer of bull sheet 13 Glass fiber mat (glass fiber) 35 Metallic paint (thermosetting resin paint)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location // B29K 23:00 101: 10 105: 08 105: 26

Claims (1)

(57) [Claims] When a thermoplastic resin component coated with a thermosetting resin paint is reused, the coated thermoplastic resin component is crushed into crushed pieces having a length of 5 mm or less at the longest dimension, and the recycled material is recycled. After that, the recycled material is mixed with a recycled thermoplastic resin material containing glass fiber having a mass percentage of 10 wt% or more and reused.