KR19990018283A - Manufacturing method of recycled resin using waste nylon carpet of automobile - Google Patents

Abstract

The present invention relates to a method for producing recycled resin using waste nylon tufted carpet for automobiles. Specifically, the present invention grinds and extrudes a nylon tufted carpet used as a floor covering for automobiles, and then adds a thermoplastic resin and a reforming agent, and kneads and melt-extrudes a pellet. The present invention relates to a method of manufacturing recycled resin that can reduce industrial waste and production costs by producing various automotive parts by injection molding after manufacturing.

Description

Manufacturing method of recycled resin using waste nylon carpet of automobile

The present invention relates to a method for manufacturing recycled resin using waste nylon carpets of automobiles, and more particularly, the present invention relates to thermoplastic resins after grinding and extruding nylon carpets used as automobile carpets that are disposed of at end of life. The present invention relates to a method for manufacturing various automotive parts by mixing, melt-extruding and injection molding a thermoplastic resin and a reforming agent.

In general, a nylon tufted carpet used as a floor covering of an automobile is mainly a 40 to 60% by weight polyamide fiber, polyethylene terephthalate (hereinafter referred to as PET) base carpet ) Is composed of 5 to 15% by weight and 15 to 50% by weight of polyethylene backing, and a part of the polyamide fibers constituting the top plate is physically impregnated into the polyethylene at the bottom.

Automotive nylon carpets that are disposed of at end of life are physically impregnated with polyamide fibers and polyethylene, making it difficult to separate each resin, making it difficult to recycle. This is because when the recycled resin is manufactured by simply extruding a waste carpet composed of polyamide fibers, PET bubble layers, and polyethylenes having different chemical properties, the physical properties of the recycled resin are remarkably deteriorated due to the weak chemical interaction between the resins. . Because of this difficulty of recycling, the waste carpet has been crushed and incinerated. However, as environmental awareness is gradually increased, regulations on environmental pollution have been strengthened, and studies are being actively conducted to reduce the generation of such wastes and to reduce the production cost of products by recycling the generated wastes.

Accordingly, the inventors of the present invention have been researching a method for recycling a nylon carpet for automobiles which have reached the end of their life, and have completed the method of producing recycled resin by mixing various additives with waste carpet crushed materials.

An object of the present invention relates to a method for producing a recycled resin that can be used as a variety of automotive parts by mixing various additives in the discarded automotive nylon carpet.

In order to achieve the above object, the present invention is to crush, melt, extrude and discard the discarded automotive nylon carpet to make a crushed product after mixing the thermoplastic resin and the modifier in an appropriate ratio, melt, extrusion and molding the product It provides a method for producing a recycled resin that can be used in various parts of the vehicle is configured to produce a.

The manufacturing method of the present invention is generally obtained by grinding a waste nylon carpet for automobiles composed of nylon fibers (40 to 60% by weight), PET bubble layer (5 to 15% by weight) and polyethylene flooring (15 to 50% by weight). It is made of scrap of ˜10 mm size and melted and extruded with a mono screw extruder to prepare a lumped recycled resin. Processing temperature in the melting and extrusion process is preferred about 265~275 ℃, which has the highest melting temperature (T _m) for waste carpet PET: This is because the (T _m 265 ℃) is contained. If the temperature in the extruder is set to 265 ° C or less, the contained PET is present in an unmelted state, as a result, the PET component is not dispersed, resulting in poor processability of the recycled resin and deterioration of physical properties.

The molten and extruded lump-like resin is put into a grinder to make a crushed material having a size of 2 to 5 mm, and then mixed uniformly using a mixer by adding a thermoplastic resin and an impact modifier. The thermoplastic resin may be a homopolymer or a block copolymer of polypropylene (hereinafter, abbreviated as PP), and a ethylene-propylene rubber (hereinafter, referred to as “modifier”). EPR) is used to reinforce elongation and impact strength.

The mixture is pelletized using a coaxial twin screw extruder and then injection molded to produce the desired parts. The recycled resin produced by the method of the present invention may be manufactured and used in various automotive parts, that is, parts such as a wheel guard, a mud guard, an engine under cover, and the like.

Hereinafter, the manufacturing method of the present invention will be described in detail with reference to Examples.

However, the following examples are merely to illustrate the present invention and the contents of the present invention are not limited by the examples.

<Example 1>

After the collected waste carpet for automobiles is pulverized to prepare 5 ~ 10mm sized crushed material, the crushed material is fed to a single screw extruder, and extruded at a processing temperature of 265 ℃ to produce lumped recycled resin. Into a crushed product having a size of 2 to 5 mm. The prepared crushed material is mixed with 50% by weight of crushed material, 45% by weight of PP and 5% by weight of EPR in a super mixer, and then fed to a coaxial twin screw extruder to remove the resin discharged from the die head of the extruder. By adjusting the temperature in the extruder so that the temperature is 265 ℃ extruded recycled resin was prepared in pellet form and injection molded to prepare a specimen.

The prepared specimens were measured flexural modulus (ASTM D790), tensile strength (ASTM D638), elongation (ASTM D638) and Izod (IZOD) impact strength (ASTM D256) to obtain the results as shown in Table 1 below.

<Example 2>

After the collected waste carpet for automobiles is pulverized to prepare 5 ~ 10mm sized crushed material, the crushed material is fed to a single screw extruder, and extruded at a processing temperature of 265 ℃ to produce lumped recycled resin. Into a crushed product having a size of 2 to 5 mm. The prepared crushed material was mixed with 50% by weight of crushed material, 45% by weight of PP homopolymer and 5% by weight of EPR in a supermixer, and fed to a coaxial twin screw extruder so that the temperature of the resin discharged from the die head of the extruder was 265 ° C. By adjusting the temperature in the extruder so as to extrude the recycled resin was prepared in pellet form and injection molded to prepare a specimen.

The prepared specimen was measured flexural modulus (ASTM D790), tensile strength (ASTM D638), elongation (ASTM D638) and Izod impact strength (ASTM D256) to obtain the results as shown in Table 1 below.

<Example 3>

After the collected waste carpet for automobiles is pulverized to prepare 5 ~ 10mm sized crushed material, the crushed material is fed to a single screw extruder, and extruded at a processing temperature of 265 ℃ to produce lumped recycled resin. Into a crushed product having a size of 2 to 5 mm. The prepared crushed material was mixed with 50 wt% of crushed matter, 40 wt% of PP block copolymer, and 10 wt% of EPR in a supermixer, and then fed to a coaxial twin screw extruder, whereby the temperature of the resin discharged from the die head of the extruder was 265 ° C. By adjusting the temperature in the extruder to extrude the recycled resin was prepared in pellet form and injection molded to prepare a specimen.

The prepared specimen was measured flexural modulus (ASTM D790), tensile strength (ASTM D638), elongation (ASTM D638) and Izod impact strength (ASTM D256) to obtain the results as shown in Table 1 below.

<Example 4>

After the collected waste carpet for automobiles is pulverized to prepare 5 ~ 10mm sized crushed material, the crushed material is fed to a single screw extruder, and extruded at a processing temperature of 265 ℃ to produce lumped recycled resin. Into a crushed product having a size of 2 to 5 mm. The prepared crushed material was mixed in 50% by weight of crushed material, 40% by weight of PP homopolymer and 5% by weight of EPR in a supermixer, and fed to a coaxial twin screw extruder so that the temperature of the resin discharged from the die head of the extruder was 265 ° C. By adjusting the temperature in the extruder so as to extrude the recycled resin was prepared in pellet form and injection molded to prepare a specimen.

The prepared specimen was measured flexural modulus (ASTM D790), tensile strength (ASTM D638), elongation (ASTM D638) and Izod impact strength (ASTM D256) to obtain the results as shown in Table 1 below.

Example 1 Example 2 Example 3 Example 4 Composition (wt%) (waste / PP / EPR) 50/45/5 50/45/5 50/40/10 50/40/10 Flexural modulus (㎏f / ㎠) 9300 8900 8500 7500 Tensile Strength (㎏f / ㎠) 225 210 215 200 % Elongation 8 10 15 20 Izod impact strength (kgfcm / cm) 3.0 3.5 3.8 5.0

In addition, in the present invention, the following comparative example is illustrated in order to compare with the recycled resin prepared by the method of the example.

<Comparative Example 1>

After the collected waste carpet for automobiles is pulverized to prepare 5 ~ 10mm sized crushed material, the crushed material is fed to a single screw extruder, and extruded at a processing temperature of 265 ℃ to produce lumped recycled resin. Into a crushed product having a size of 2 to 5 mm. The prepared crushed material is mixed by using a super mixer, and then fed to a coaxial twin screw extruder to adjust the temperature in the extruder so that the temperature of the resin discharged from the die head of the extruder is 265 ° C. The specimen was prepared by injection molding.

The prepared specimen was measured flexural modulus (ASTM D790), tensile strength (ASTM D638), elongation (ASTM D638) and Izod impact strength (ASTM D256) to obtain the results as shown in Table 2.

<Comparative Example 2>

After the collected waste carpet for automobiles is pulverized to prepare 5 ~ 10mm sized crushed material, the crushed material is fed to a single screw extruder, and extruded at a processing temperature of 265 ℃ to produce lumped recycled resin. Into a crushed product having a size of 2 to 5 mm. 50% by weight of crushed materials and 50% by weight of PP are mixed in a super mixer, and then fed to a coaxial twin screw extruder to adjust the temperature in the extruder so that the temperature of the resin discharged from the die head of the extruder is 265 ° C. The pellets were prepared in a pellet form and injection molded to prepare specimens.

The prepared specimen was measured flexural modulus (ASTM D790), tensile strength (ASTM D638), elongation (ASTM D638) and Izod impact strength (ASTM D256) to obtain the results as shown in Table 2.

<Comparative Example 3>

After the collected waste carpet for automobiles is pulverized to prepare 5 ~ 10mm sized crushed material, the crushed material is fed to a single screw extruder, and extruded at a processing temperature of 265 ℃ to produce lumped recycled resin. Into a crushed product having a size of 2 to 5 mm. 50% by weight of crushed materials and 50% by weight of EPR are mixed in a super mixer and fed to a coaxial twin screw extruder to control the temperature in the extruder so that the temperature of the resin discharged from the die head of the extruder is 265 ° C. to extrude the recycled resin. The pellets were prepared in a pellet form and injection molded to prepare specimens.

The prepared specimen was measured flexural modulus (ASTM D790), tensile strength (ASTM D638), elongation (ASTM D638) and Izod impact strength (ASTM D256) to obtain the results as shown in Table 2.

<Comparative Example 4>

The homopolymer PP was fed to a coaxial twin screw extruder, and the temperature in the extruder was adjusted so that the temperature of the resin discharged from the die head of the extruder was 265 ° C. to extrude the PP resin into pellets, and injection molded. Prepared.

The prepared specimen was measured flexural modulus (ASTM D790), tensile strength (ASTM D638), elongation (ASTM D638) and Izod impact strength (ASTM D256) to obtain the results as shown in Table 2.

<Comparative Example 5>

PP, a block copolymer, is fed to a coaxial twin screw extruder to control the temperature in the extruder so that the temperature of the resin discharged from the die head of the extruder is 265 ° C. Prepared.

The prepared specimen was measured flexural modulus (ASTM D790), tensile strength (ASTM D638), elongation (ASTM D638) and Izod impact strength (ASTM D256) to obtain the results as shown in Table 2.

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Composition (% by weight) Waste resin 50/50 (waste / PP) 50/50 (waste / EPR) PP ^* PP ^# Flexural modulus (㎏f / ㎠) 5400 10500 9500 13000 12000 Tensile Strength (㎏f / ㎠) 140 240 220 320 280 % Elongation 4 8 8 150 100 Izod impact strength (kgfcm / cm) 1.2 1.9 2.0 3.4 9.3 * PP: homopolymer # PP: block copolymer

As seen in Table 1 and Table 2, it can be seen that the composition of the embodiment prepared by the manufacturing method of the present invention has a smaller physical property deterioration compared to the composition prepared from the recycled resin obtained by processing the waste carpet.

As described above, the present invention is an environmentally friendly manufacturing method for reducing industrial waste and production costs by recycling the nylon carpet for automobiles at the end of their life without the need for incineration and landfill, the manufacturing method of the present invention Regenerated resin produced through the lower physical properties compared to the raw material resin can be usefully used as a variety of automotive parts.

Claims (5)

Waste nylon carpet (waste-nylon tufted carpet) is recovered, crushed, extruded, and crushed again to be crushed, and then mixed with a thermoplastic resin and a modifier in an appropriate ratio, and melted, extruded and molded to produce recycled resin. . The reclaimed resin according to claim 1, wherein the waste carpet is pulverized to a size of 5 to 10 mm, and then the reclaimed resin obtained by extruding and molding is further micro-pulverized to a size of 2 to 5 mm. How to prepare. The process for producing recycled resin according to claim 1, wherein the processing temperature of the step of melting and extruding the pulverized waste carpet is 265 ° C to 275 ° C. The method of claim 1, wherein 5 to 80% by weight of polypropylene is added to the waste carpet crushed product with a thermoplastic resin. The method of claim 1, wherein 5-40% by weight of ethylene-propylene copolymer rubber (EPR) is added to the waste carpet crushed product as a modifier.