KR20010017104A - The Manufacturing Method of Synthetic Resin Plywood - Google Patents

Abstract

PURPOSE: Provided is a process for producing a synthetic resin plywood, which is excellent in light weight property and processability, and is applicable for in interior materials for building and materials for furniture. CONSTITUTION: The process comprises the steps of: i) mixing waste a polyethylene resin with 10-50wt% of one more filler selected from sawdust, husks and paper sludge; ii) adding 1-5wt% of maleic anhydride as an adhesive property intensifier to the mixture; iii) heating extrusion it at 180-210deg.C to obtain a first extrusion plate; iv) laminating an extrusion sheet of polyethylene on one side or both side of upper and lower sides of the first extrusion plate; and then v) heating-pressure it at 160-180deg.C under a pressure of 5-10kgf.

Description

Manufacturing Method of Synthetic Resin Plywood

The present invention relates to a method for manufacturing a synthetic resin plywood, and more particularly, to a method for manufacturing a synthetic resin-wood plywood having a beautiful appearance that can be used as interior partition materials, furniture materials, and the like.

Representative products of building materials boards, which are currently used for interior partition materials and furniture materials, include particle boards and medium density fiberboard products. Since they are made of wood, they have relatively strong strength, light weight, and low cost. However, since wood is used as a raw material, water resistance is insufficient, and when water is absorbed, thickness expansion and dimensional deformation occur severely.

On the other hand, natural wood, which is widely used as a furniture material, takes not only a lot of processing time to be used, but also excessive consumption of wood has a problem of greatly deteriorating environmental functions by damaging forest resources.

As a solution to the problems of the prior art, Korean Patent Publication No. 98-48920 is mentioned. This technique consists of mixing the chaff into the waste plastic, heating it with the addition of styrene-ethylene-butadiene-styrene, and extruding it, which has the advantage of recycling the waste resources. There is a problem that can not be used as a high-quality interior materials or furniture materials because the appearance is poor.

Another prior art is Korean Patent No. 163577. This technique uses a mixer to dryly mix finely powdered novolac phenolic resin containing no moisture in the dewatered, dried and pulverized paper sludge; After preliminary pressurization of the mixture into a plate using a prepress press; The process of forming by heating and pressurizing using a high pressure heat press is included.

This technology has the advantages of recycling paper sludge, which is a waste material, and the properties of the obtained product, which is relatively good, but has a problem of relatively high manufacturing cost and poor appearance of the obtained product.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a synthetic resin plywood having a low manufacturing cost and excellent physical properties of the obtained product, and particularly having a good appearance.

Another object of the present invention is to effectively recycle the waste resources that are currently mostly disposed of.

The present invention mixes 10 to 50% by weight of at least one filler selected from sawdust, rice hull, and papermaking sludge into polyethylene waste resin, and adds 1 to 5% by weight of maleic anhydride as an adhesive reinforcing agent, and then 180 to 1 After heat extrusion at a temperature of 210 ° C., the extrusion sheet made of polyethylene is laminated on one or both surfaces of the upper and lower parts of the primary extrusion plate, and heated and pressed at a temperature of 160 to 180 ° C. and a pressure of 5 to 10 kgf.

Hereinafter, the present invention will be described in detail.

The waste resin used in the present invention is a polyethylene waste resin, and a representative example thereof is waste vinyl used for agriculture.

The filler used in the present invention is selected from sawdust, rice hull, paper sludge, these may be used mixed. Such wood fillers are not only denser and less expensive than plastics, but also improve the processability of the final product. It is necessary for the filler to lower the moisture content to within 5% before use, and the appropriate amount of use is 10 to 50% by weight (based on buildings), more preferably 30 to 40% by weight. If more than the above range, the strength of the final product is insufficient, if less than the above range, the light weight and workability of the final product is reduced.

One type of the fillers may be used alone, but in order to compensate for the drawbacks, it is preferable to use three kinds of fillers in combination. For example, when only sawdust is used, the strength of the final product may be insufficient, and when only chaff is used, lightness may be insufficient. When these three types are used in combination, particles of different sizes are present together, so that even dispersibility can be obtained and the properties of the final product are improved.

In order to improve the strength of the product and the adhesion between the raw materials, 1 to 5% by weight of maleic anhydride is added as an adhesive enhancer. If it is less than one range, the strength of the final product is insufficient, and even if it exceeds this range, further increase in physical properties is insignificant.

After uniformly mixing the mixture of the above composition, and heat extrusion, a synthetic resin-wood primary extrusion plate is obtained. Suitable extrusion temperatures are 180 to 210 ° C.

Separately extruded polyethylene sheets are stacked on upper and lower portions of the obtained primary extrusion plate, and the final product is obtained by heating and pressing the laminated extrusion plate. Suitable heating temperatures are 160 to 180 ° C. The external polyethylene sheet is strongly bonded to the inner primary extrusion plate without the use of an adhesive and integrated by heating. If desired, the polyethylene sheet may be pigmented to give color or to form a pattern. The method of forming the pattern is achieved by pressing with a pressure plate or pressing roller in which an embossed or intaglio pattern is formed.

The obtained product is not only significantly reduced in cost compared to the extruded plate made of a general synthetic resin, but also excellent in light weight and workability, superior in strength to other synthetic resin-wood products, and especially has a beautiful appearance.

Embodiments of the present invention are as follows.

<Example 1-5>

Sawdust, rice hull, and paper sludge dried on waste polyethylene resin (waste vinyl) are mixed as shown in Table 1, and 2 parts by weight of maleic anhydride is added to 100 parts by weight of the mixture, and the primary extrusion plate is extruded at a temperature of 180 to 210 ° C. Got it. The high-density polyethylene sheet extruded separately from the upper and lower parts of the obtained primary extrusion plate was laminated, and heated and pressurized under a pressure condition of 5 to 10 kgf to obtain a final product. Physical properties of the obtained product are shown in Table 1.

<Comparative Example 1>

The same procedure as in Example 1 was carried out except that maleic anhydride was not added. The physical properties of the product are shown in Table 1.

<Comparative Example 2>

In Example 1, the physical properties of the primary extrusion plate not laminated with the high density polyethylene sheet are shown in Table 1.

division Waste Vinyl (%) Sawdust (%) Chaff (%) Paper Sludge (%) Tensile Strength (MPa) % Elongation Modulus of elasticity (GPa) Exterior Example 1 60 20 10 10 5.1 ± 0.3 12.1 ± 1.5 0.49 ± 0.04 Good Example 2 65 10 10 15 5.7 ± 0.3 13.3 ± 1.6 0.77 ± 0.03 Good Example 3 70 10 10 10 6.2 ± 0.5 14.5 ± 1.8 0.69 ± 0.03 Good Example 4 55 10 15 20 4.9 ± 0.3 9.7 ± 1.4 0.86 ± 0.03 Good Example 5 50 10 20 20 4.4 ± 0.3 9.2 ± 1.5 0.94 ± 0.04 Good Comparative Example 1 60 20 10 10 4.6 ± 0.3 1.4 ± 1.6 0.43 ± 0.03 Good Comparative Example 2 60 20 10 10 4.0 ± 0.3 13.2 ± 1.5 0.54 ± 0.05 Bad

As can be seen from the above examples and comparative examples, the product according to the present invention is not only excellent in light weight and workability, but also significantly improved in appearance characteristics, which is a problem in the prior art, and thus, as a building interior material or furniture material. It can be usefully used.

Claims (3)

10-50% by weight of at least one filler selected from sawdust, rice hull, papermaking sludge is mixed with polyethylene waste resin, and 1-5% by weight of maleic anhydride as an adhesive enhancer is added, followed by heat extrusion at a temperature of 180-210 ° C. To obtain a primary extrusion plate, laminated extrusion sheets of polyethylene on one or both sides of the upper and lower portions of the primary extrusion plate, and heat-pressurized at a temperature of 160 to 180 ℃ and a pressure of 5 to 10 kgf. . The method of manufacturing a synthetic resin plywood according to claim 1, wherein color is applied to the extruded sheet made of polyethylene. The method of manufacturing a synthetic resin plywood according to claim 1, wherein a pattern is formed on an extruded sheet made of polyethylene.