KR100250643B1 - Wood polymer composite from recycled agricultural polyethylene films - Google Patents

Abstract

PURPOSE: A wood-polymer composite prepared by mixing waste agricultural vinyl with wood chip, sawdust and maleic acid anhydride is provided, which produces a substitute for wood having excellent physical properties of plastic and wood and contributes to the saving of resources and prevention of environmental pollution. CONSTITUTION: In a wood-polymer composite containing waste agricultural vinyl as a matrix, 1 to 5 parts by weight of maleic acid as an adhesion reinforcing agent is added to 30 to 50 parts by weight of waste agricultural vinyl and 10 to 50 parts by weight of wood side products. The waste agricultural vinyl is ethylene resin selected from the group consisting of HDPE, LLDPE, LDPE and EVA.

Description

Wood Resin Composition with Waste Vinyl for Agriculture

A wood resin composition mixed with wood has been developed using polyethylene resin (LLDPE) as a raw material, but prior art regarding wood resin composition using waste vinyl resin has not been developed.

The development of wood resin composition (referred to as WPC) using recycled plastic as a matrix has been studied in Korea and abroad, and wood resin composition recycled from plastic bags is sold in the United States. In the present invention, to produce a wood resin composition using the agricultural waste vinyl and wood by-products used for mulching and to analyze the physical properties to promote the recycling of agricultural waste vinyl.

Along with the improvement of living order, the consumption of fruits and vegetables increases regardless of the season, so a large amount of vinyl is used for the plastic house, and vinyl is also widely used for mulching to obtain effective agricultural conditions. Accordingly, the amount of waste vinyl is also increasing year by year.

In general, agricultural vinyl is mainly used because polyethylene (PE) -based resin is highly compatible between waste vinyl can be easily recycled.

However, agricultural waste vinyl is difficult to recycle due to its high cleaning cost and limited use. The biggest problem with recycling agricultural waste vinyl is the removal of dirt from the surface. The waste vinyl used for the plastic house can be recycled without the need for special cleaning because there is less soil on the surface, but since the waste vinyl used for mulching contains a large amount of soil, it must be removed first.

Currently widely used washing method has a disadvantage of high cost by wet washing with water. However, recently, the air washer developed by the laboratory (Korean Patent Application No. 97-17999) seems to play a part in reducing the recycling cost.

The recycled vinyl has not been found to be suitable for use, which is an obstacle to promoting recycling of waste vinyl. Accordingly, wood resin composition was developed to promote the recycling of waste vinyl for mulching.

Currently, wood by-products (chips, sawdust, wood flour, etc.) produced in wood processing are used in the manufacture of MDF (Medium Density Fiberboard), PB (Particleboard) or wood resin composition together with polymer adhesives.

Wood resin composition has been spotlighted as a substitute for wood because of its low density, high strength, low price and low water absorption compared to wood.

In the present invention, the resin (recycled vinyl, raw resin) and the wood reinforcing agent (wood chips, sawdust) were dried in an oven at 75 ° C. for one day and then stored together with the desiccant until blending.

In the preparation of the wood resin composition, the manufacturing process was slightly changed depending on the addition of the adhesive reinforcement 2. In the case of the wood resin composition without the adhesive enhancer (maleic anhydride, MA), resin was added to a blender (HAAKE, Series 9000) at 160 ° C, mixed at 60 rpm for 5 minutes, and then wood was added. Thereafter, the mixture was mixed for 5 minutes at 120 rpm and 5 minutes at 60 rpm. When the binder was added, first, wood, 1/3 of the resin weight (33%), and the adhesive forcing agent were added, and the wood was mixed at 60 rpm for 10 minutes. After the remaining resin was added and mixed for 10 minutes at 120 rpm, 5 minutes at 120 rom.

In the present invention, a wood resin composition is prepared by mixing wood by-products and reinforcement enhancers in wet-washed agricultural vinyls, dry-washed agricultural vinyls and PE raw materials, and according to the content of wood, the amount of adhesive reinforcing agent and the method of washing waste vinyl. Changes in physical properties were discussed.

Physical properties were measured at 10 mm / min using Instrom 5567 according to ASTM D638M. In addition, an extensometer (Instron 2630-100) was used for accurate elastic modulus measurement.

Example 1

(Changes in Properties of Wood Resin Compositions According to Wood Content)

목재수지조성물(Wood-LLDPE composites)

Wood-LLDPE Composites

Table 1 shows the change of physical properties of the wood resin composition prepared by changing the content of wood chips or sawdust in the resin (raw resin). The content of the adhesion enhancer (MA) used was 5% of the wood weight.

As shown in the table, wood resin composition without adhesive enhancer tended to decrease Tensile stress and Tensile modulus with increasing wood content.

However, it can be seen that when the adhesive enhancer is added, the tensile strength increases and the elongation decreases while the increase of the elastic modulus increases. This change is solved because the added adhesion enhancer improved the adhesion of wood and resin.

Compared with the resin composition (50% wood chip, added adhesive reinforcing agent) and the resin (recycling, raw material) using 50% resin (raw resin), the tensile strength is about 30% and the elastic modulus is about 300%. have.

However, wood resin composition using sawdust instead of wood chips (50% of sawdust and adhesive reinforcement) showed 40% higher tensile strength and 400% elasticity than resin (raw resin).

This difference is thought to be due to the smaller particle size of the sawdust than the wood chips and the better mixing with the resin.

TABLE 1

목재재활용 수지조성물(Wood-Recyeled PE film Composites)

Wood-Recyeled PE film Composites

Table 2 shows the change of physical properties of wood resin composition prepared by changing the content of wood chips in wet-washed recycled vinyl (HDPE: LLDPE: LDPE: EVA = 10: 6: 3: 1).

As in the case of using LLDPE as the resin, the adhesive tendency used 5% of the weight of wood.

Wood resin composition made from recycled vinyl showed higher tensile strength and elasticity and lower elongation than wood resin composition made of LLDPE due to the influence of HDPE. That is, elongation decreased and elastic modulus tended to increase with increasing wood content regardless of addition of adhesive reinforcing agent.

Tensile strength of wood resin composition without adhesive reinforcement tended to decrease with increasing wood content. However, tensile strength and similar value of resin were shown when adhesive reinforcement was added.

In addition, it can be seen that the decrease in elongation is lowered when the adhesive enhancer is added. The modulus of elasticity was not significantly affected by the addition of the adhesive reinforcement, and the wood resin composition containing 50% of the wood chips showed a 300% improvement over the elastic modulus of the recycled vinyl itself.

TABLE 2

Example 2

(Changes in Properties of Wood Resin Compositions According to the Content of Adhesive Enhancers)

목재수지조성물(Wood-LLDPE Composite)

Wood-LLDPE Composite

Table 3 shows the change of physical properties of the wood resin composition prepared by mixing wood chips or sawdust in the resin composition at a weight ratio of 50% and changing the content of the adhesive enhancer from 0% to 5%.

As shown in the table, it can be seen that the tensile strength or the elastic modulus is greatly improved by the addition of only 1% of the adhesive reinforcing agent, and the improvement of the physical properties due to the addition is not very large.

Regardless of the type of wood and the content of the adhesive reinforcing agent, the wood resin composition with the adhesive reinforcing agent increased the tensile strength by 300% and the elongation by 170% compared to the wood resin composition without the adhesive reinforcing agent. Has improved up to 200%.

TABLE 3

목재재활용 수지조성물(Wood-Recycled PE film Composites)

Wood-Recycled PE Film Composites

Table 4 shows the change of physical properties of the wood resin composition prepared by mixing wood chips in wet-washed recycled vinyl at a weight ratio of 50% and changing the content of the adhesion enhancer (MA) from 0% to 5%.

Like the change in the properties of wood resin composition made of LLDPE, the addition of only 1% adhesive reinforcement improved the properties, but the addition was not effective.

The properties of the wood resin composition with the adhesive enhancer increased by 180% in tensile strength and 170% in elongation compared to the wood resin composition without the adhesive enhancer.

TABLE 4

Example 3

(Comparison of Physical Properties of Wood Resin Compositions Using Wet Washed Recycled Vinyl and Mixed Raw Resin)

Wood-washed resin composition was prepared by mixing recycled vinyl and wet wood chips at 50:50 and using an adhesive enhancer of 5% by weight of wood.

In addition, the raw resin is mixed according to the component ratio of recycled vinyl ((HDPE: LLDPE: LDPE: EVA = 10: 6: 3: 1) to compare the physical properties with the wood resin composition made of recycled vinyl. Prepared.

From the measurement results of the physical properties of Table 5, the wood resin composition made of wet-washed recycled vinyl showed very similar properties to the wood resin composition made of mixed raw resin.

The value is shown.

TABLE 5

(Comparison of Physical Properties of Wood Resin Compositions Using Wet Wash Recycled Vinyl and Mixed Resin)

Example 4

(Comparison of Properties of Wood Resin Compositions Using Dry Washed Recycled Vinyl and Mixed Resin)

Using a dry-washed recycled vinyl (HDPE: LLDPE: LDPE: EVA = 10: 6: 3: 1) to the wood resin composition under the same conditions as in Example 3 (wood chip 50%, adhesive enhancer 50%) After the preparation, the physical properties of wood resin composition prepared from mixed raw resin were compared.

The physical properties of the wood resin composition made from dry-cleaned recycled vinyl in Table 6 are similar to the wood resin composition made of wet-washed recycled vinyl and the wood resin composition made of mixed raw resin. It seems to be.

TABLE 6

농업용 폐비닐을 목재수지조성물의 매트릭스로 이용함으로써 폐비닐의 재활용용범위를 이용함으로써 폐비닐의 재활용범위를 확대할 수 있다.

By using agricultural waste vinyl as a matrix of wood resin composition, the recycling range of waste vinyl can be expanded by using the recycling range of waste vinyl.

목재가공후 발생된 목재칩, 톱밥 등을 보강제로 이용함으로써 목재부산물을 재활용할 수 있다.

Wood by-products can be recycled by using wood chips and sawdust generated after wood processing as reinforcing agents.

플라스틱과 목재의 장점을 고루 갖춘 우수한 물성의 목재 대용품을 생산할 수 있다.

It can produce wood substitutes of good properties with the advantages of plastic and wood.

매트릭스와 목재보강제의 혼합비율을 다양하게 변화시킴으로써 물성조절이 가능하다.

The physical properties can be controlled by varying the mixing ratio of the matrix and the wood reinforcement.

자원의 절약과 환경오염 방지에 기여할 수 있다.

It can contribute to saving of resources and prevention of environmental pollution.

Claims (3)

(Correction) A wood resin composition comprising waste vinyl for agriculture as a matrix, wherein maleic acid is added to the agricultural waste vinyl and wood by-product as an adhesive strengthening agent. (Correction) The waste vinyl according to claim 1, wherein the waste vinyl for agriculture uses an ethylene resin selected from the group consisting of HDPE, LLDPE, LDPE, EVA, the reinforcement uses wood chips or sawdust as a wood by-product, and the adhesive enhancer uses maleic acid. A wood resin composition comprising a waste vinyl for agriculture as a matrix. (Correction) The agricultural waste vinyl according to claim 1 or 2, wherein 30-50 parts by weight of agricultural waste vinyl, 10-50 parts by weight of wood by-product and 1-5 parts by weight of an adhesive strengthening agent are used. Wood resin composition.