Method for preparing wood-plastic composite material

A wood-plastic composite material and material technology, which is applied in the field of wood-plastic composite material preparation, can solve the problems of material quality decline, large proportion of plastics, and insufficient combination of plastic and wood fiber, so as to reduce production costs, reduce molecular weight, and reduce dosage. improved effect

Inactive Publication Date: 2012-01-25
福建弘景木塑科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology has two key defects that hinder the great development of the wood-plastic industry: one is that the unplasticized polar wood fibers have poor compatibility with plastics, and the combination of plastics and wood fibers is not tight,

Method used

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  • Method for preparing wood-plastic composite material
  • Method for preparing wood-plastic composite material
  • Method for preparing wood-plastic composite material

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preparation example Construction

[0029] The specific embodiment of the present invention provides a kind of preparation method of wood-plastic composite material, it is characterized in that: it comprises the following steps:

[0030] (1) Pretreatment: Pretreat the wood fibers with a chemical graft modifier to eliminate the polarity of the wood fibers; the specific method of the pretreatment is to stir the wood fibers at high speed, and when the temperature reaches 105-115°C While adding the chemical grafting modifier, continue to stir at high speed, stop stirring when the temperature reaches 120-125°C, and wait for use.

[0031] This step mainly uses the frictional heat generation of high-speed stirring to remove excess moisture in the wood fibers; and completes the chemical modification of the wood fibers with the help of high-speed stirring and high shear to eliminate the polarity of the wood fibers as much as possible.

[0032] (2) High-speed blending: PVC resin, pretreated wood fiber and additives are pr...

Embodiment 1

[0069] Follow the steps below to prepare wood-plastic composites:

[0070] (1) Preprocessing:

[0071] ①The mushroom sticks are crushed, dried and screened first, the moisture content of the mushroom sticks is kept within 8% by drying, and the impurities are removed by screening;

[0072] ②Continue to carry out chemical grafting modification treatment: first, stir 90 kg of mushroom sticks that have been crushed, dried and screened at high speed; when the temperature reaches 105 ° C, add 0.1 kg of dicumyl peroxide to make the molecules of wood fibers Active groups are formed at the end of the chain; then add 0.5 kg of titanate coupling agent and continue stirring at high speed; stop stirring when the temperature reaches 120°C, and set aside;

[0073] (2) High-speed blending:

[0074] ① Stir and mix 100kg PVC resin and 6kg heat stabilizer (calcium-zinc composite stabilizer) together at high speed;

[0075] ②When the temperature reaches 75°C, add 2kg of lubricant (using paraff...

Embodiment 2

[0081] Follow the steps below to prepare wood-plastic composites:

[0082] (1) Preprocessing:

[0083] ①The mushroom sticks are crushed, dried and screened first, the moisture content of the mushroom sticks is kept within 8% by drying, and the impurities are removed by screening;

[0084] ②Continue to carry out chemical graft modification treatment: first, stir 105kg mushroom sticks that have been crushed, dried and screened at high speed; when the temperature reaches 110°C, add 0.5kg of dicumyl peroxide to make the molecules of wood fibers Active groups are formed at the end of the chain; then add 2 kg of titanate coupling agent and continue stirring at high speed; stop stirring when the temperature reaches 122°C, and set aside;

[0085] (2) High-speed blending:

[0086] ① Stir and mix 100kg PVC resin and 8kg heat stabilizer (calcium-zinc composite stabilizer) together at high speed;

[0087] ②When the temperature reaches 82°C, add 3kg of lubricant (using paraffin), 10kg o...

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Abstract

The invention relates to a method for preparing a wood-plastic composite material, which is characterized by comprising the following steps of: (1) pretreatment: pretreating wood fibers by using a chemical graft modifier to remove the polarity of the wood fibers; (2) high speed blending: performing high speed stirring and blending on polyvinyl chloride (PVC) resin, the pretreated wood fibers and aids for preplastification; (3) extrusion molding: feeding the pre-plasticized materials into an extruder, fully plasticizing the materials at proper temperature, extruding the plasticized materials into a moulding mould, and performing extrusion molding on the materials under the action of extrusion force; and (4) cooling and shaping: cooling and shaping the extruded blanks. The content of the wood fibers in the wood-plastic composite materials can be greatly improved, the bonding tightness of the wood fibers and the plastic is enhanced, the wood texture of the wood-plastic composite materials is enhanced, the production cost is reduced, and the wood-plastic composite material has good physical and mechanical properties.

Description

technical field [0001] The invention relates to a preparation method of wood-plastic composite material. Background technique [0002] The existing wood-plastic composite material preparation process originates from plastic modification, which uses wood fiber materials as plastic fillers, and wood fiber and plastic are forcibly combined by external pressure or glue. This technology has two key defects that hinder the great development of the wood-plastic industry: one is that the unplasticized polar wood fibers have poor compatibility with plastics, and the combination of plastics and wood fibers is not tight, resulting in a decline in the quality of the entire material; the other is that The proportion of plastic used is large, the wood effect is not ideal, the production cost is high, and there is no price advantage, so it is difficult to open the market. Contents of the invention [0003] In order to solve the above-mentioned problems in the prior art, the present inve...

Claims

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Application Information

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IPC IPC(8): C08L27/06C08L97/02C08H8/00B29C47/00
Inventor 陈吓洪
Owner 福建弘景木塑科技股份有限公司
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