Wood-plastic composite section and preparation method thereof

A wood-plastic composite material and wood fiber material technology, applied in the direction of the base frame, etc., can solve the problems of large smoke production and addition amount, complicated operation, difficult to mix evenly, etc.

Active Publication Date: 2013-12-04
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, hydrocarbons such as plastics are relatively easy to burn, so that wood-plastic composite materials are also easy to burn. In order to overcome the flammability of wood-plastic composite materials, it is an effective way to endow wood-plastic composite materials with surface flame retardancy, as disclosed in CN101486267A A surface flame-retardant wood-plastic composite material sheet and a preparation method thereof are disclosed. The surface flame-retardant wood-plastic composite material is composed of two layers of whisker-modified plastic layers and plant fiber-reinforced plastic layers, and the two layers of whisker-modified plastic layers There is a plant fiber reinforced plastic layer molded in between, the whisker modified plastic layer is made by mixing and calendering modified basic magnesium sulfate whiskers, plastic particles, etc., and the plant fiber reinforced plastic layer is made by mixing and calendering plastic particles and plant fibers
CN101486267A Wood-plastic composites made by hot pressing or using flame-retardant adhesives on ...

Method used

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  • Wood-plastic composite section and preparation method thereof

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preparation example Construction

[0030] More preferably, described lightweight material is biomass-based polyurethane foam, and the preparation method of described biomass-based polyurethane foam comprises the following steps:

[0031] (1) At 100-135°C, make straw lignin materials, polyols and acidic catalysts undergo a first contact reaction for 1-4 hours, and then add starch for a second contact reaction to obtain lignin modified products;

[0032] (2) Evenly mix the modified lignin, polyether polyol, amine catalyst and blowing agent, then add isocyanate according to the isocyanate index of 1-1.4 for the third contact reaction, and the third contact reaction The resulting product was cured.

[0033] In the present invention, the term "isocyanate index" refers to the ratio of isocyanate equivalents to polyol equivalents, indicating the degree of excess isocyanate in the polyurethane formulation, and the isocyanate equivalents refer to the moles of isocyanate in isocyanate, The polyol equivalents refer to the ...

Embodiment 1

[0057] (1) Preparation of shell

[0058] 100 parts by weight of pentaerythritol and 85 parts by weight of phosphoric acid were mixed, and stirred and reacted at 140° C. for 1 hour, and then 185 parts by weight of polyether polyol (polyether polyols purchased from Beijing Bailing Qingyue Polyurethane Factory) were added to the reaction product. Polyol 4110), 160 parts by weight of ammonium polyphosphate (purchased from Beijing Lianchuang Chemical Co., Ltd., the degree of polymerization is 1500) and 150 parts by weight of melamine, and stirred and reacted at 140 ° C for 0.5 hours to prepare a flame retardant .

[0059]100 parts by weight of plastic (polypropylene, with a weight-average molecular weight of 250,000), 100 parts by weight of lignocellulosic material (wood flour, with a particle size of 100 mesh), 80 parts by weight of the above-mentioned flame retardant, and 5 parts by weight of plasticizer agent (epoxidized soybean oil), 3 parts by weight of antioxidant (antioxida...

Embodiment 2

[0079] Profile A2 was prepared according to the method of Example 1, except that in step (2), 110 parts by weight of corn stalks (particle size 80-120 mesh), 100 parts by weight of polyethylene glycol, 30 parts by weight of Glycerin and 1.5 parts by weight of sulfuric acid (98% concentrated sulfuric acid) were mixed and reacted at 120°C for 2.5 hours to prepare lignin-modified products.

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Abstract

The invention discloses a wood-plastic composite section and a preparation method thereof. The wood-plastic composite section is characterized by comprising a shell and a light material filled in the shell, the shell is made of a wood-plastic composite, and the density of the light material is lower than that of the wood-plastic composite. A shell preparation method includes uniformly mixing raw materials prior to extrusion molding, and the raw materials include plastic, a wood fiber material and a flame retardant. A flame retardant preparation method includes subjecting phosphoric acid and pentaerythritol to first contact reaction for 0.5-5 hours at the temperature of 100-180 DEG C, adding polyether polyol, ammonium polyphosphate and melamine and/or urea into a product obtained by the first contact reaction, and performing second contact reaction for 0.5-4 hours at the temperature of 100-180 DEG C. The section has excellent flame retardance. In addition, the light material is filled in the shell, so that strength of the section is improved on the premise of not increasing the weight of the section greatly.

Description

technical field [0001] The invention relates to a wood-plastic composite profile and a preparation method thereof, in particular to a flame-retardant wood-plastic composite profile filled with light materials and a preparation method thereof. Background technique [0002] The profile is the transition layer between the wall and the window, which can fix and prevent the wall around the window from collapsing. In order to save raw materials and reduce the weight of the profile, the profile is generally made hollow, but this will affect the strength of the profile to a certain extent. [0003] Wood-plastic composite material is a new type of composite material that has been booming at home and abroad in recent years. It refers to the use of polyethylene, polypropylene, polyvinyl chloride, etc., mixed with waste plant fibers such as wood powder, rice husk, straw, etc. to form new wood materials. It is a new type of material produced by extrusion, molding, injection molding and ...

Claims

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Application Information

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IPC IPC(8): E06B1/02B29C47/00C08L97/02C08L23/12C08L23/06C08L27/06C08K13/02C08K5/521C08K3/32C08K5/3492C08K5/21C08L75/08C08G18/64C08G18/48
Inventor 秦特夫黄洛华李改云韩雁明
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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