KR20030042572A - Biodegradable Resin Composition and Articles Molded with the Same - Google Patents

Abstract

PURPOSE: A resin composition which can be degraded by a microorganism and ultraviolet rays to prevent environmental pollutions, and can be molded to give an automobile air filter guide, oil filter cap, fuel filter cap, interior board and cabin filter guide is provided. CONSTITUTION: The bio-decomposable and bio-degradable resin composition comprises 10 to 80 wt% of a base resin containing one or more resins selected from the group consisting of polypropylene, polycarbonate, polyethylene, polystyrene, polyvinyl chloride, polyester, polyamide, acryl(polyacrylate), ABS resin, alkyd resin, epoxy resin, phenol resin, urea resin, melamin resin, aniline resin and mixtures thereof, and 90 to 20 wt% of a thermoplastic starch. The resin composition, if needed, may further comprise a ceramic material, wood powder, synthetic short fiber, talc, felt, hemp fiber, metallic fiber, glass fiber and/or pulp.

Description

Biodegradable Resin Composition and Articles Molded with the Same}

Field of invention

The present invention relates to biodegradable and biodegradable resin compositions. More specifically, the present invention relates to an environment-friendly biodegradable and biodegradable resin composition without causing environmental pollution by having a degrading performance, and in particular, biodegradable which can be applied to guides or oil filter caps of air filters used in automobiles and the like. And a biodegradable resin composition. The present invention also includes all molded articles molded by the biodegradable and biodegradable resin compositions according to the present invention.

Background of the Invention

Plastics are lightweight and have excellent process formability, making them widely used today as general consumer and industrial materials. Plastics are also relatively stable to heat, do not rust, and do not decompose by light or water, so they are durable. However, as the amount of plastic used increases and especially the amount of plastic discarded after being used as packaging materials, plastic houses, disposable products, etc., plastic waste is not decomposed in the natural ecosystem, causing environmental pollution. As the above environmental problems arise, methods of synthesizing or processing plastics that decay or decompose by themselves or other effects on the natural state have been steadily studied as part of the solution. Therefore, much research has been made on the necessity of degradable plastics, and the degradable plastics can be largely divided into two types. The first is biodegradable and biodegradable plastics decomposed by natural conditions or microorganisms, and the second is photodegradable plastics decomposed by ultraviolet rays in sunlight.

Biodegradable and biodegradable plastics are inherently biodegradable and biodegradable, using natural polymers such as starch and cellulose. As known in the art, U.S. Patent No. 4,021,388 is composed of carbon-carbon linked polymer and starch granules dispersed in the polymer, and starch granules are biodegradable modified with compounds having hydroxyl groups to form ethers or esters. Dispersible and biodegradable plastic compositions are disclosed. However, such biodegradable plastics have the disadvantage that only starch is biodegraded in the blended resin mixture and other plastics remain in nature without degrading, causing secondary environmental pollution.

Korean Laid-Open Patent No. 97-43399 relates to a method for preparing microbial degradable aliphatic polyester multifilament by esterifying an aliphatic dicarboxylic acid and glycol, but has practical strength of biodegradability and biodegradability, and has sufficient strength and elongation. There is a disadvantage that cannot be manufactured economically suitable at a cost.

U. S. Patent No. 5,407, 979 discloses a thermosetting film composed of an alkanoyl polymer, disintegratable starch and an ethylene copolymer, and U. S. Patent No. 5,461, 094 is a biodegradable product prepared by combining starch and polyethylene with a binder and adding an acid catalyst copolymer. And biodegradable polyethylene compositions.

Biodegradable and biodegradable plastic films should be easily degraded by microorganisms to prevent environmental pollution, while having good thermal stability and mechanical strength for practicality.

In the second photodegradable plastic, two methods for providing photodegradability are explained. First, the polymer is synthesized to have a structure where molecular chains are easily cleaved by light, and the second is a technology of decomposing plastic by using an additive having a structure where radicals can be formed by light.

As a conventionally known technique, U. S. Patent No. 3,860, 538 discloses a photodegradable polymer composition comprising, as a main component, an addition polymer or a copolymer with at least one vinylidene monomer and a ketone copolymer having an unsaturated ketone structure as a secondary component. U. S. Patent No. 4,337, 181 also discloses a process for producing biodegradable and biodegradable films consisting of a mixture of gelatin starch material and ethylene acrylic acid copolymer.

The inventors of the present invention provide an air filter guide, an oil filter cap, a fuel filter cap, an interior material board, an interior material mat, an interior plastic injection part, an engine and an electric component, and a cabin filter guide (air conditioner filter guide). ) Is molded into a resin composition that is not biodegradable, so that many environmental pollutions are caused, leading to the development of biodegradable and biodegradable resin compositions suitable for them.

An object of the present invention is to provide a biodegradable and biodegradable resin composition that can be degraded by microorganisms or ultraviolet rays in the natural state.

Another object of the present invention is to provide a biodegradable and biodegradable resin composition capable of molding an air filter guide, an oil filter cap, a fuel filter cap, a vehicle interior board and a cabin filter guide of an automobile.

Another object of the present invention is to provide a molded article that can solve the environmental pollution problem by molding the air filter guide, oil filter cap, fuel filter cap, automotive interior board and cabin filter guide of the vehicle with a biodegradable and biodegradable resin composition. It is to.

The above and other objects of the present invention can be achieved by the present invention described in detail below.

1 is a schematic perspective view of an air filter that can be molded by applying the biodegradable and biodegradable resin composition according to the present invention.

2 is a schematic perspective view of an oil filter that can be molded by applying the biodegradable and biodegradable resin composition according to the present invention.

Brief description of the main symbols in the drawing

1: air filter 2: air filter guide

3: filter 4: oil filter

5: oil filter cap 6: filter

Summary of the Invention

Biodegradable and biodegradable resin composition according to the present invention is polypropylene, polycarbonate, polyethylene, polystyrene, polyvinylchloride, polyester, polyamide, acrylic (polyacrylate), ABS resin, alkyd resin, epoxy It is prepared by mixing 90 to 20% by weight of thermoplastic starch with 10 to 80% by weight of at least one base resin selected from the group consisting of resin, phenol resin, urea resin, melamine resin and aniline resin.

The biodegradable and biodegradable resin composition may be a ceramic material, wood flour, synthetic fiber short fibers (fiber), talc, pulp, mixed yarn felt (felt), hemp fibers, metal fibers, glass fibers, etc. may be added as necessary. . The ceramic material used in the present invention is preferably a ceramic material having a high porosity containing 85% by weight or more of silicon oxide, and is used in the range of 10 to 30 parts by weight based on 100 parts by weight of the biodegradable and biodegradable resin. desirable. It is preferable that the wood flour has an average fiber length of 20 to 800 µm, an average diameter of 15 to 20 µm and a density of 1.0 to 2.0 g / cm 3, and 10 to 30 parts by weight of 100 parts by weight of biodegradable and biodegradable resins. It is preferable to use in the range by weight.

The short synthetic fibers are preferably polyester, polypropylene, nylon and polyethylene short fibers, and preferably have an average fiber length of 0.1 to 50 mm. Talc is added as a filler and an appropriate amount of pulp may be used if necessary.

Hereinafter, with reference to the accompanying drawings will be described in detail the contents of the present invention.

Detailed Description of the Invention

The biodegradable and biodegradable resin composition according to the present invention is prepared in a chip state by mixing 90 to 20% by weight of thermoplastic starch with 10 to 80% by weight of the base resin. The biodegradable and biodegradable resin composition prepared in a chip state is used as a raw material for molding each molded article.

The basic resin used in the present invention is polypropylene, polycarbonate, polyethylene, polystyrene, polyvinyl chloride, polyester, polyamide, acrylic (polyacrylate), ABS resin, alkyd resin, epoxy resin, phenol resin , Urea resin, melamine resin and aniline resin. These can be used individually or in mixture of 2 or more types.

The thermoplastic starch used in the present invention may be preferably a modified starch modified starch.

In the biodegradable and biodegradable resin composition of the present invention, ceramic materials, wood flour, synthetic fiber short fibers, talc, pulp, mixed yarn felt, hemp fibers, metal fibers, glass fibers, and the like may be added. . Ceramic materials are components used to enhance biodegradability, wood flour, short synthetic fibers, and pulp are components used to enhance the strength of molded articles, and talc is a component used as filler.

The ceramic material preferably contains a ceramic oxide having a high porosity by containing at least 85% by weight of silicon oxide, and is preferably used in the range of 10 to 30 parts by weight based on 100 parts by weight of the biodegradable and biodegradable resin.

The wood flour has an average length of 20 to 800 μm, preferably an average diameter of 15 to 20 μm and a density of 1.0 to 2.0 g / cm 3, and 10 to 30 weight parts based on 100 parts by weight of the biodegradable and biodegradable resin. It is preferable to use in the negative range.

The short synthetic fibers are preferably short fibers such as polyester, polypropylene, nylon, polyethylene, polyvinyl chloride, etc., and preferably have an average fiber length of 0.1 to 50 mm. Synthetic fibers Short fibers are preferably used in the range of 5 to 25 parts by weight based on 100 parts by weight of the biodegradable and biodegradable resin.

The biodegradable and biodegradable resin composition according to the present invention can be used as a raw material for molding a car air filter guide, an oil filter cap, a fuel filter cap, an air conditioner cabin filter guide, or various interior boards of automobiles. have.

Automotive interior boards include headlining (ceiling), door trim, rear package tray, wheel house trim, trunk trim, and the like. Conventional automotive interior boards have been used polypropylene boards, resin felt boards, wood stock, hemp fiber boards, paper boards, etc., but these are all serious because they are not biodegradable and biodegradable It has caused environmental pollution. When the above molded article is manufactured with the biodegradable and biodegradable resin composition of the present invention, the modified starch, wood flour, short fibers, etc. are contained, so that the specific gravity is low, and thus the product can be lightened.

1 is a schematic perspective view of an air filter that can be molded by applying the biodegradable and biodegradable resin composition according to the present invention. The air filter 1 consists of a filter 3 and an air filter guide 2 for supporting the filter. The conventional air filter guide is a molded article of synthetic resin that does not decompose. The filter 3 is mainly manufactured using a nonwoven fabric. Therefore, when the air filter is replaced, the used air filter is discarded as it is, which is a cause of environmental pollution because the air filter guide is not decomposed.

2 is a schematic perspective view of an oil filter that can be molded by applying the biodegradable and biodegradable resin composition according to the present invention. The oil filter 4 is composed of a filter 6 and an oil filter cap 5 for supporting the filter. The conventional oil filter cap is made of metal. Therefore, when the used oil filter is discarded, the oil filter cap causes environmental pollution.

The biodegradable and biodegradable resin composition according to the present invention shows a decomposition rate of about 30% after about 30 days when left in its natural state after molding, and about 50% after about 60 days. It was. The measurement of this decomposition rate was made by ASTM G21.

The biodegradable and biodegradable resin composition according to the present invention is preferably injection molded at a temperature of about 150 to 250 ° C., but extrusion molding, compression molding, vacuum molding and blow molding are also possible.

The invention can be better understood by the following examples, which are intended for the purpose of illustration of the invention and are not intended to limit the scope of protection defined by the appended claims.

Example

Example 1

60 wt% of modified starch modified with corn starch was mixed with 40 wt% of polyamide resin to prepare chips and then air filter guides were formed at 200 ° C. After being left in the natural state, the degradation rate was about 35% after 30 days and about 48% after 60 days.

Example 2

20 parts by weight of wood powder was mixed with 100 parts by weight of the resin composition of Example 1, and the extrusion was carried out in the same manner as in Example 1 except for extrusion into a vehicle interior material sheet. The decomposition rate was about 32% after 30 days, and about 53% after 60 days.

Example 3

The same process as in Example 1 was carried out except that 25 parts by weight of polypropylene short fibers were mixed with 100 parts by weight of the resin composition of Example 1 and extruded into an automobile interior sheet. The degradation rate was about 28% after 30 days and the degradation rate was about 50% after 60 days.

Example 4

It carried out in the same manner as in Example 1, except that 10 parts by weight of talc and 10 parts by weight of pulp were mixed with 100 parts by weight of the resin composition of Example 3 and extruded into an automobile interior sheet. The degradation rate was about 35% after 30 days and about 55% after 60 days.

The present invention provides a molded article that can solve the environmental pollution problem by providing a biodegradable and biodegradable resin composition capable of molding the air filter guide, oil filter cap, fuel filter cap, automotive interior board and cabin filter guide of the vehicle. It has the effect of the invention.

Simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

Claims (9)

Polypropylene, polycarbonate, polyethylene, polystyrene, polyvinyl chloride, polyester, polyamide, acrylic (polyacrylate), ABS resin, alkyd resin, epoxy resin, phenolic resin, urea resin, melamine resin, aniline resin And 10 to 80% by weight of a base resin and 90 to 20% by weight of thermoplastic starch composed of one or more resins selected from the group consisting of a mixture of these and biodegradable and biodegradable resin compositions. The biodegradable and biodegradable resin composition of claim 1, wherein the thermoplastic starch is a modified starch. The biodegradable and biodegradable material according to claim 1, further comprising ceramic material, wood flour, short synthetic fiber, talc, weed felt, hemp fiber, metal fiber, glass fiber and / or pulp. Resin composition. The method of claim 3, wherein the ceramic material is a porous ceramic containing at least 85% by weight of silicon oxide (silicon oxide), and is added in an amount of 10 to 30 parts by weight based on 100 parts by weight of the biodegradable and biodegradable resin. Biodegradable and biodegradable resin composition characterized in that. The wood flour has an average length of 20 to 800 µm, an average diameter of 15 to 20 µm, a density of 1.0 to 2.0 g / cm 3, and is based on 100 parts by weight of the biodegradable and biodegradable resin. A biodegradable and biodegradable resin composition, which is added in an amount of 10 to 30 parts by weight. The method of claim 3, wherein the synthetic short fibers are selected from the group consisting of polyester, polypropylene, nylon, polyethylene and polyvinyl chloride, has an average fiber length of 0.1 to 50 mm, the biodegradable and biodegradable A biodegradable and biodegradable resin composition, which is added in an amount of 5 to 25 parts by weight based on 100 parts by weight of the resin. The molded article manufactured from the biodegradable and biodegradable resin composition of any one of the said Claims 1-6. An air filter (1) comprising a filter (3) and an air filter guide (2) molded from the biodegradable and biodegradable resin composition of claim 1. Oil filter (4), characterized in that it comprises a filter (6) and an oil filter cap (5) molded from the biodegradable and biodegradable resin composition of claim 1.