Manufacturing method of light wood-plastic composite panel

A wood-plastic composite and production method technology, applied in the field of lightweight wood-plastic composite boards, can solve the problems of long-term heating, easy degradation of materials, difficult micropore diameter and distribution, long process flow, etc., and achieve short and shortened molding process. The effect of low production cycle and pressure

Inactive Publication Date: 2008-12-10
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above method of preparing microporous wood-plastic composite boards mainly has two major problems: 1. The process is long, the material is easily degra

Method used

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  • Manufacturing method of light wood-plastic composite panel
  • Manufacturing method of light wood-plastic composite panel

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0034] Example 1

[0035] Put 100 parts of polyvinyl chloride resin powder with an average particle size of 120 mesh, 2 parts of epoxy soybean oil, 3 parts of 20% chloroprene rubber-dioctyl phthalate / tetrahydrofuran (=1:6) solution into electric heating Mix in a high-speed mixer for 8 minutes, and then add 60 parts of dry wood chips treated with 2% aminosilane ethanol solution (concentration 2%) with an average particle size of 80 mesh, 4 parts methyl phenyl silicone oil and 4 parts benzene sulfonate The hydrazide is mixed for another 5 minutes, and when the temperature rises to 60°C, discharge the material; put the mixture into a heat preservation storage container at a constant temperature of 45°C±5°C and a relative humidity of 60%, and store it for 2 hours.

[0036] Put the stored mixture into a plastic mold cavity that has been preheated to be constant at 85°C±5°C, the sheet thickness is 2cm, and the area is 1m×2m. The mold is closed, and the temperature is 180°C±5°C with a hy...

Example Embodiment

[0038] Example 2

[0039] Put 100 parts of ultra-high molecular weight polyethylene powder with an average particle size of 60 mesh, 3 parts of naphthenic oil, and 2 parts of ethyl silicone oil into an electric heating kneader and mix for 5 minutes, and then add 70 parts of an average particle size of 40 mesh. The dried chaff hulls treated with 2% vinyltriethoxysilane ethanol solution (concentration 3%) are mixed for 3 minutes. When the temperature rises to 60°C, unload; put the mixture into a heat preservation storage container, and keep it at a constant temperature. 60℃±5℃, relative humidity 55%, store for 20 hours.

[0040] Put the stored mixture into a plastic mold cavity that has been preheated constant at 120°C±5°C, the sheet thickness is 1cm, and the area is 1m×1m. The mold is closed, and the temperature is 180°C±5°C with a hydraulic press. Molding at 6MPa for 5 minutes, venting once in the middle, and then maintaining the pressure at 5MPa, cooling for 3 minutes to obtain a...

Example Embodiment

[0042] Example 3

[0043] Put 100 parts of copolymer polypropylene powder with an average particle size of 200 meshes, 2 parts of polypropylene wax and 1 part of montan ester wax into an electric heating kneader and mix for 3 minutes, and then add 75 parts of dry bamboo chips with an average particle size of 120 meshes and Mix 2 parts of ammonium bicarbonate for another 5 minutes. When the temperature rises to 50±5℃, put it into a plastic model that has been preheated to a constant temperature of 50℃±5℃, the thickness of the sheet is 1.5cm, and the area is 2m×1m. In the cavity, close the mold, use a hydraulic press to mold at a temperature of 190°C±5°C and a pressure of 15Mpa for 7 minutes without air release, then keep the pressure at 5MPa and cool for 3 minutes to obtain a lightweight polypropylene wood-plastic composite board.

[0044] The aperture of the open-pored microporous composite sheet is 0.1-10um, the porosity is 20%±5%, and the static bending strength is ≥15MPa.

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Abstract

The invention discloses a production method for a lightweight wood-plastic compound plate. The method includes that thermoplastic plastic powder, the average grain diameter of which is 40 meshes or above, is first mixed with at least one of a plasticizer, a tackifier, a dispersant or a foaming agnet; the mixture is preheated to 40 to 130 DEG C; then after being uniformly mixed with dried organic cellulose filler powder the average grain diameters of which is 40 meshes or above, the mixture is put into a pre-heated plastic mold cavity and pressed for 3 to 15 minutes at the mold pressing temperature of 150 to 200 DEG C and a pressure of 5 to 20MPa; the air is discharged for 0 to 3 times during the pressing process and finally the mixture is cooled under pressure keeping. The shaping process flow and the heating time of the invention are short; the organic cellulose filler and the plastic are hard to be degraded; besides, the pressure is low and the pressing time is short; not only is the production period shortened, but also energies are saved. Besides, the method of the invention is also beneficial to controlling the aperture ratio, the aperture size and the distribution as well as the porosity of the wood-plastic plate by virtue of the grain diameter of the powder, additives and the shaping technique.

Description

technical field [0001] The invention belongs to the technical field of preparation of wood-plastic composite material microporous products, and in particular relates to a method for producing light wood-plastic composite boards with microporous structures by semi-melt compression molding. Background technique [0002] Wood-plastic composite materials are organic cellulose fillers such as waste wood (leftovers, waste, branches, etc.), fast-growing forest trees, agricultural waste cellulose (husks, straw, bamboo chips, nut shell powder, straw, beans, etc.) , flax, corn starch, etc.) in the form of powder, fiber or shavings, as a reinforcement or filler added to a composite material made of plastic. Wood-plastic composite material has dual advantages of wood and plastic. The development of wood-plastic composite material products can not only alleviate the contradiction between the supply and demand of wood and oil, but also can use waste plastic, waste wood fiber and crop fibe...

Claims

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Application Information

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IPC IPC(8): B29C70/42B29K101/12B29K201/00
Inventor 吴智华周鹏熊鸿
Owner SICHUAN UNIV
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