KR19990018292A - Recycling method of heterogeneous composite materials 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 an ethylene modified with ethylene-acrylic acid-maleic anhydride (EEM) terpolymer or maleic anhydride after grinding a heterogeneous composite material for automobile parts composed of nylon, polyethylene (PE) and polyethylene terephthalate (PET). A recycling method of melt blending by further adding a modifier such as a -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 automotive parts consisting of nylon, polyethylene (polyethylen, PE) and polyethylene terephthalate (PET) and then ethylene-acrylic acid-maleic anhydride (ethylene-acrylic acid- Maleic anhydride (EEM) The present invention relates to a recycling method of melt blending by further adding a modifier such as a terpolymer or a maleic anhydride-modified ethylene propylene (EPR) copolymer.

Heterogeneous composite material for automobile parts is composed of materials with different basic properties and parts such as instrument panel, automobile rear package, trunk trim, carpet, 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 (PP). It is composed of a core layer made of one kind of material, and the flooring carpet has a three-layer structure of a nylon or PET fiber layer, a PET bubble layer, and a PE backing. Commonly used carpet floorings consist of 30-60% nylon fibers, 5-25% PET foam layers, 15-50% PE backings, rear package trays and trunk trims. 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 heterogeneous composite material composed of nylon, PE, and PET, which are thermoplastic resins such as the carpet, since three different materials are mixed in terms of their structure, it is difficult to separate them by material, so phase separation between the three types of resins when regeneration is performed ( phase separation significantly reduces the physical properties. In particular, the recycled resin is difficult to develop applications even if recycled because of low elongation and impact strength. Therefore, 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 resins having 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 adding a modifier to melt blending. 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 adding the modifier to melt blending.

In this case, 0.1-50 parts 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 0.5-15 weight. If it is a part, it is more preferable.

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 parts 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- It is still more preferable if it is 15 weight part. 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) was 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 heterogeneous composite material, it is possible to manufacture recycled resin having 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 above 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 Preparation of Recycled Resin by Melt Processing 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 of 5-10 mm in size, 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 the basic physical properties, by preparing the crushed material having a size of 2-5 mm by secondary grinding in the above-mentioned recycled resin in a grinder.

Comparative Example 2 Preparation of Recycled Resin Resin Processed Waste Carpet

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

Comparative Example 3 Preparation 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 lumpy recycled resin. Table 1 shows the results of measuring the elongation and tensile strength, which are the basic physical properties, by preparing the crushed material having a size of 2-5 mm by secondary grinding in the above-mentioned recycled resin in a grinder.

Comparative Example 4 Preparation 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 265 ° C. using a single screw extruder to prepare a lumpy recycled resin. Table 1 shows the results of measuring the elongation and tensile strength, which are the basic physical properties, by preparing the crushed material having a size of 2-5 mm by secondary grinding in the above-mentioned recycled resin in a grinder.

As can be seen from Table 1, the elongation and tensile strength of the recycled resin is higher when the processing temperature condition of Comparative Example 1 is 265 ° C. or less when PET is melted at 265 ° C.

Processing temperature (℃) Tensile Strength (kgf / cm ² ) Elongation (%) Comparative Example 1 215 110 2 Comparative Example 2 225 115 2 Comparative Example 3 245 125 2 Comparative Example 4 265 133 4

Example 1 Preparation of Recycled Resin Recycling Waste Carpet

The recycled resin was prepared by recycling the pulverized product using the processing temperature condition of 265 ° C., which has the best tensile property, and then melt blended 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.

Waste carpets composed of heterogeneous composite materials were first pulverized to prepare 5-10 mm scrap, and extruded at 265 ° C. with a single screw extruder to produce lumped regenerated resin. The recycled resin prepared above was secondly ground to prepare a particle size of 2-5 mm. The EEM, which is a modifier, is uniformly mixed in the secondary pulverized recycled resin to a super mixer at 0.5 phr, and then a die head portion is formed using a co-rotating twin screw extruder. Extrusion was carried out so that the temperature of resin coming out was 265 ° C (melt blending). The extrudate was precipitated by cooling the resin while passing through water (pelletizing), and the results of measuring the basic physical properties by injection molding are shown in Table 2.

At this time, elongation and notched Izod impact strength were increased in Example 1 than in Comparative Example 4, in which the modifier was not added.

Example 2 Preparation of Recycled Resin Recycling Waste Carpet

Waste carpets composed of heterogeneous composite materials were first pulverized to prepare 5-10 mm scrap, and extruded at 265 ° C. with a single screw extruder to produce lumped regenerated resin. The recycled resin prepared above was secondly ground to prepare a particle size of 2-5 mm. The EEM, which is a modifying agent, was uniformly mixed in the secondary pulverized recycled resin to a 1 phr by using a super mixer, and then the die head part was co-rotated using a co-rotating twin screw extruder. Extrusion was carried out so that the temperature of resin coming out was 265 ° C (melt blending). The extrudate was precipitated by cooling the resin while passing through water (pelletizing), and the results of measuring the basic physical properties by injection molding are shown in Table 2.

At this time, 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 Preparation of Recycled Resin Recycling Waste Carpet

Waste carpets composed of heterogeneous composite materials were first pulverized to prepare 5-10 mm scrap, and extruded at 265 ° C. with a single screw extruder to produce lumped regenerated resin. The recycled resin prepared above was secondly ground to prepare a particle size of 2-5 mm. The EEM, which is a modifying agent, was uniformly mixed in the secondary milled recycled resin to a super mixer to 3 phr, and then the die head part was co-rotated using a co-rotating twin screw extruder. Extrusion was carried out so that the temperature of resin coming out was 265 ° C (melt blending). The extrudate was precipitated by cooling the resin while passing through water (pelletizing), and the results of measuring the basic physical properties by injection molding are shown in Table 2.

At this time, the elongation rate 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 Preparation of Recycled Resin Recycling Waste Carpet

Waste carpets composed of heterogeneous composite materials were first pulverized to prepare 5-10 mm scrap, and extruded at 265 ° C. with a single screw extruder to produce lumped regenerated resin. The recycled resin prepared above was secondly ground to prepare a particle size of 2-5 mm. The secondary milled recycled resin was uniformly mixed in a super mixer with a modifier of EEM of 5 phr, followed by a die head using a co-rotating twin screw extruder. Extrusion was carried out so that the temperature of resin coming out was 265 ° C (melt blending). The extrudate was precipitated by cooling the resin while passing through water (pelletizing), and the results of measuring the basic physical properties by injection molding are shown in Table 2.

At this time, the elongation rate 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 Preparation of Recycled Resin Recycling Waste Carpet

Waste carpets composed of heterogeneous composite materials were first pulverized to prepare 5-10 mm scrap, and extruded at 265 ° C. with a single screw extruder to produce lumped regenerated resin. The recycled resin prepared above was secondly ground to prepare a particle size of 2-5 mm. The secondary milled recycled resin was uniformly mixed with a modifier of EEM to 7 phr by using a super mixer, and then the die head portion was co-rotated using a co-rotating twin screw extruder. Extrusion was carried out so that the temperature of resin coming out was 265 ° C (melt blending). The extrudate was precipitated by cooling the resin while passing through water (pelletizing), and the results of measuring the basic physical properties by injection molding are shown in Table 2.

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

Creation costs Mechanical properties Shredding Modifier (phr) Specific gravity (g / cm ² ) Tensile Strength (kgf / cm ² ) % Elongation Flexural modulus (kgf / cm ² ) Notched Izod Impact Strength (kgfcm / cm) Comparative Example 4 100 0 1.02 133 4 5,400 1.3 Example 1 100 0.5 1.02 131 8 5,500 5.8 Example 2 100 One 1.02 145 12 5,000 2.6 Example 3 100 3 1.02 137 12 4,900 2.9 Example 4 100 5 1.02 132 12 4,400 3.5 Example 5 100 7 1.02 120 12 3,500 4.8

* 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) First, the heterocomposite composed of nylon, polyethylene (PE) and polyethylene terephthalate (PET) is pulverized to prepare scraps of 5-10 mm in size and extruded at 265 ° C or higher to produce recycled resin. (First step); 2) crushing the recycled resin prepared in the first step to prepare a crushed product having a particle size of 2-5 mm (second step); And 3) adding a modifier to the regenerated resin prepared in the second step, mixing uniformly, melt blending at 265 ° C. and then injection molding (third step) Recycling method of heterogeneous composite material, characterized in that consisting of. 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, the content of which is added is 0.1-50 parts by weight, More preferably 0.5-15 parts by weight recycling method of the heterocomposite.