KR100232627B1 - Method of recycling a different type of composite material used for automobile parts - Google Patents

Abstract

The present invention relates to a method for recycling heterogeneous composite materials for automobile parts. Specifically, the present invention is to crush the heterocomposite for automobile parts consisting of nylon, polyethylene (PE) and polyethylene glycol terephthalate (PET) and then modified with ethylene-acrylic acid-maleic anhydride (EEM) terpolymer or maleic anhydride. A recycling method of melt blending by further adding a modifier such as an ethylene-propylene (EPR) copolymer.

Description

Recycling method of heterogeneous composite materials for automobile parts

The present invention relates to a method for recycling heterogeneous composite materials for automobile parts.

More specifically, the present invention is to crush the heterogeneous composite material for automobile parts consisting of nylon, polyethylene (polyethylen, PE) and polyethylene terephtaalate (PET) and then ethylene-acrylic acid-maleic anhydride , EEM) The present invention relates to a recycling method of melt blending by further adding a modifier such as ethylene-propylene (EPR) copolymer modified with terpolymer or maleic anhydride.

Heterogeneous composite materials for auto parts are materials composed of materials with different basic properties and parts such as instrument panels, car rear packages, trunk trims, carpets, etc. Used for For example, instrument panels include a polyvinyl chloride (PVC) skin layer with a polyurethane foam interlayer, a polycarbonate (PC) / acrylonitrile-butadiene-styrene (ABS) blend and glass fiber reinforced ABS, composite polypropylene ( It is composed of a core layer made of one kind of material of PP), and the carpet, which is a flooring material, has a three-layer structure of a nylon or PET fiber layer, a PET bubble layer, and a PE backing. Commonly used carpet flooring consists of 30-60% nylon fiber, 5-25% PET foam layer, 15-50% PE backing, and rear package tray and trunk trim. Similar to the carpet flooring, the trim trim has a three-layer structure of nylon or PET fiber layer, PET bubble layer, and PE bottom surface.

Thermoplastic resins are synthetic resins having thermoplastics, which are roughly classified from a processing point of view, and are generally classified as thermosetting resins that cannot be recycled. Thermoplastic resins are chemically structural linear polymers, and various resins such as polystyrene, polyethylene, and polyamide belong to them and are processed proportionally by extrusion molding and injection molding, and defective moldings and scraps are recycled and used. There is an advantage.

In the case of a heterogeneous composite material composed of nylon, PE, and PET thermoplastic resins such as carpet, they are mixed with three different materials in terms of their structure, and thus, separation by materials is difficult. phase separation significantly reduces the physical properties. In particular, even if the recycled resin has low elongation and impact strength, it is difficult to develop a use. In the past, a method of embedding or discarding or incineration of a heterogeneous composite material has been mainly adopted. However, the method of landfilling or incineration is not only expensive but also has a problem of polluting the environment.

In order to manufacture recycled resin with improved elongation and impact resistance by recycling heterogeneous composite materials composed of nylon, PE and PET, the present inventors have developed a recycling method by pulverizing the heterogeneous composite material and then further melt blending by adding a modifier. The present invention has been completed.

An object of the present invention is to provide a method for recycling a heterogeneous composite material consisting of nylon, PE and PET.

In order to achieve the above object, the present invention provides a recycling method of pulverizing a heterogeneous composite material consisting of nylon, PE and PET, and then melt blending by further adding a modifier.

At this time, as a modifier, 0.1-50% by weight of an ethylene-acrylic acid-maleic anhydride (EEM) terpolymer or an ethylene-propylene (EPR) copolymer modified with maleic anhydride is added, and the amount of the modifier added is 0.5- It is more preferable if it is 15 weight%.

Hereinafter, the present invention will be described in detail.

The method for recycling the heterogeneous composite material of the present invention

1) preparing a recycled resin by pulverizing a heterogeneous composite material consisting of nylon, PE and PET in the first step to produce a scrap of 5-10 mm size and extrusion molding at 265 ℃ or more,

2) preparing a crushed scrap having a particle size of 2-5 mm by secondary grinding of the recycled resin prepared in step (1);

3) adding a modifier to the regenerated resin prepared in step (2), mixing uniformly, melt blending at 265 ℃ or more and then injection molding.

The modifier added in this process adds 0.1-50% by weight of an ethylene-acrylic acid-maleic anhydride (EEM) terpolymer or an ethylene-propylene (EPR) copolymer modified with maleic anhydride, with the amount of modifier added being 0.5 More preferably, it is -15 weight%. The modifier added in this way increases the mutual strength between nylon and PC to improve the elongation and impact properties of the produced recycled resin.

In the above method, the crystal melting temperature (Tm) is set at a processing temperature based on 265 ° C. at which PET having the highest crystal melting temperature is melted among heterogeneous composite materials, which is a PET bubble layer when the extrusion temperature is less than the crystal melting temperature of the PET component. This is because it does not melt.

Industrial wastes such as carpet flooring, automobile back shelf, trunk trim, etc. composed of a heterogeneous composite material of nylon fiber layer, PET bubble layer, and PE backing layer can be recycled in this way.

By recycling the double composite material, it is possible to manufacture recycled resin with improved elongation and impact resistance, and the recycled resin of the present invention is based on a luggage trim, a trunk mat, and an engine undercover. It can be recycled into automotive parts such as under cover and wheel guard.

In addition, waste scraps that may occur when molding the automotive parts from recycled resin recycled by the method of the present invention can be continuously recycled using the same recycling method.

Hereinafter, the present invention will be described in detail.

However, the following examples are merely to illustrate the invention, the present invention is not limited by the examples.

Comparative Example 1

[Production of Recycled Resin Resin Processed Waste Carpet]

The recycled resin was prepared by recycling waste carpet grounds as a material and changing the processing temperature, and then measured tensile strength and elongation as basic properties.

The waste carpet was first pulverized to prepare scraps having a size of 5-10 mm, and then the carpet shreds were extruded at 215 ° C. with a single screw extruder to prepare a lumped recycled resin. Table 1 shows the results of measuring the elongation and tensile strength, which are basic physical properties, by preparing the crushed material having a size of 2-5 mm by secondary grinding in the above-mentioned recycled resin into a grinder.

Comparative Example 2

[Production of Recycled Resin Resin Processed Waste Carpet]

The waste carpet was first pulverized to prepare scraps having a size of 5-10 mm, and the crushed carpet was extruded at 225 ° C. using a single screw extruder to prepare a lumped recycled resin. Table 1 shows the results of measuring the elongation and tensile strength, which are basic physical properties, by preparing the crushed material having a size of 2-5 mm by secondary grinding in the above-mentioned recycled resin into a grinder.

Comparative Example 3

[Production of Recycled Resin Resin Processed Waste Carpet]

The waste carpet was first pulverized to prepare scraps having a size of 5-10 mm, and then the crushed carpet was extruded at 245 ° C. using a single screw extruder to prepare a lumped recycled resin. Table 1 shows the results of measuring the elongation and tensile strength, which are basic physical properties, by preparing the crushed material having a size of 2-5 mm by secondary grinding in the above-mentioned recycled resin into a grinder.

[Comparative Example 4]

[Production of Recycled Resin Resin Processed Waste Carpet]

The waste carpet was first pulverized to prepare scraps having a size of 5-10 mm, and the crushed carpet was extruded at 265 ° C. using a single screw extruder to prepare a lumped recycled resin. Table 1 shows the results of measuring the elongation and tensile strength, which are basic physical properties, by preparing the crushed material having a size of 2-5 mm by secondary grinding in the above-mentioned recycled resin into a grinder.

As can be seen from Table 1 Comparative Example 1 is higher than the elongation and tensile strength of the recycled resin when the processing temperature conditions are 265 ℃ melting PET PET is less than the processing temperature conditions of Comparative Example 1-Comparative Example 3 or less.

Example 1

[Manufacture of Recycled Resin Recycling Waste Carpet]

The recycled resin was prepared by recycling the pulverized product by adopting the processing temperature condition of 265 ° C., which has the best tensile property, followed by melt blending with a modifier added as a co-rotating twin-screw extruder.

The modifier improves the elongation and impact characteristics of the recycled resin by increasing the mutual pull between nylon and PE during the melt blending process.

A waste carpet composed of heterogeneous composite materials was first pulverized to prepare scraps having a size of 5-10 mm, and extruded at 265 ° C. using a single screw extruder to prepare a lumped regenerated resin. The recycled resin prepared above was secondly pulverized to prepare a particle size of 2-5 mm. The EEM, which is a modifying agent, is uniformly mixed in a secondary mixer to 0.5 phr by using a super mixer, and then the die head portion is co-rotated using a co-rotation twin screw extruder. Extruded so that the temperature of resin coming out was 265 degreeC (melt blending). The extrudate was precipitated by thinking of the resin while passing through water (pelletizing), and the result of measuring the basic physical properties by injection molding is shown in Table 2.

At this time, elongation and notched Izod impact strength were increased in the case of Example 1 than in Comparative Example 4 without the addition of the modifier.

Example 2

[Manufacture of Recycled Resin Recycling Waste Carpet]

A waste carpet composed of heterogeneous composite materials was first pulverized to prepare scraps having a size of 5-10 mm, and extruded at 265 ° C. using a single screw extruder to prepare a lumped regenerated resin. The recycled resin prepared above was secondly pulverized to prepare a particle size of 2-5 mm. The EEM, which is a modifying agent, is uniformly mixed in the secondary pulverized recycled resin with a super mixer to 1 phr, and then, at the die head part using a co-rotation twin screw extruder. Extrusion was carried out so that the temperature of resin coming out might be 265 degreeC (melt blending). The extrudate was precipitated by thinking of the resin while passing through water (pelletizing), and the result of measuring the basic physical properties by injection molding is shown in Table 2.

At this time, the elongation and notched Izod impact strength were increased in the case of Example 2 than in Comparative Example 4 without the addition of the modifier.

Example 3

[Manufacture of Recycled Resin Recycling Waste Carpet]

A waste carpet composed of heterogeneous composite materials was first pulverized to prepare scraps having a size of 5-10 mm, and extruded at 265 ° C. using a single screw extruder to prepare a lumped regenerated resin. The recycled resin prepared above was secondly pulverized to prepare a particle size of 2-5 mm. The EEM, which is a modifying agent, is uniformly mixed in the secondary milled recycled resin with a super mixer to 3 phr, and then, at the die head part using a co-rotation twin screw extruder. Extrusion was carried out so that the temperature of resin coming out might be 265 degreeC (melt blending). The extrudate was precipitated by thinking of the resin while passing through water (pelletizing), and the result of measuring the basic physical properties by injection molding is shown in Table 2.

At this time, elongation and notched Izod impact strength were increased in the case of Example 3 than in Comparative Example 4 without the addition of the modifier.

Example 4

[Manufacture of Recycled Resin Recycling Waste Carpet]

A waste carpet composed of heterogeneous composite materials was first pulverized to prepare scraps having a size of 5-10 mm, and extruded at 265 ° C. using a single screw extruder to prepare a lumped regenerated resin. The recycled resin prepared above was secondly pulverized to prepare a particle size of 2-5 mm. The EEM, which is a modifier, in the secondary milled recycled resin is uniformly mixed with a super mixer to 5 phr, and then, at the die head part using a co-rotation twin screw extruder. Extrusion was carried out so that the temperature of resin coming out might be 265 degreeC (melt blending). The extrudate was precipitated by thinking of the resin while passing through water (pelletizing), and the result of measuring the basic physical properties by injection molding is shown in Table 2.

At this time, elongation and notched Izod impact strength were increased in the case of Example 4 than in Comparative Example 4 without the addition of the modifier.

Example 5

[Manufacture of Recycled Resin Recycling Waste Carpet]

A waste carpet composed of heterogeneous composite materials was first pulverized to prepare scraps having a size of 5-10 mm, and extruded at 265 ° C. using a single screw extruder to prepare a lumped regenerated resin. The recycled resin prepared above was secondly pulverized to prepare a particle size of 2-5 mm. The EEM, which is a modifying agent, is uniformly mixed with the secondary mixer to 7 phr by using a super mixer, and then co-rotation twin screw extruder is used at the die head. Extrusion was carried out so that the temperature of resin coming out might be 265 degreeC (melt blending). The extrudate was precipitated by thinking of the resin while passing through water (pelletizing), and the result of measuring the basic physical properties by injection molding is shown in Table 2.

At this time, elongation and notched Izod impact strength were increased in Example 5 than in Comparative Example 4, in which the modifier was not added.

* Modifier: Ethylene and maleic anhydride content in the copolymer = 15%, melt index (MI) = 3

As described above, the method for recycling the heterogeneous composite material by adding the modifier of the present invention provides a recycled resin having improved impact strength and elongation characteristics while maintaining overall strength and elastic modulus.

Since the method for recycling heterogeneous composite materials of the present invention recycles waste to recycled resin, it is possible to fundamentally prevent environmental pollution due to landfilling or incineration of waste, and to reduce the cost of landfilling or incineration of waste. Recycled recycled resin is used for other parts of automobiles, which also reduces overall costs.

Claims (2)

1) Firstly crush the heterocomposite composed of nylon, polyethylene (PE) and polyethylene terephthalate (PET) to prepare scraps of 5-10mm size, and extruded at 265 ℃ -365 ℃ Preparing (first step); 2) preparing a crushed product having a particle size of 2-5 mm by secondary grinding of the recycled resin prepared in the first step (second step); And 3) recycling the heterogeneous composite material, comprising the step of adding the modifier to the recycled resin prepared in the second step, mixing the melt uniformly, melt blending at 265 ° C.-365 ° C., and then injection molding (third step). Way. The method of claim 1, wherein the modifier is an ethylene-acrylic acid-maleic anhydride (EEM) terpolymer or an ethylene-propylene (EPR) copolymer modified with maleic anhydride, and the amount thereof added is 0.5-15% by weight. Recycling method of a heterogeneous composite material, characterized in that.