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Wood-plastic composite material and preparation method thereof

A technology of wood-plastic composite materials and wood powder, which is applied in the field of composite materials to achieve the effects of good appearance, low water absorption and excellent mechanical properties

Inactive Publication Date: 2009-12-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the use of some resins with strong radiation resistance as the matrix material of wood-plastic composites to improve their weather resistance.

Method used

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  • Wood-plastic composite material and preparation method thereof
  • Wood-plastic composite material and preparation method thereof
  • Wood-plastic composite material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Soak the wood flour with 1mol / L NaOH aqueous solution, the bath ratio (i.e. the mass ratio of wood flour to NaOH aqueous solution) is 1:15, then wash with deionized water until neutral, and then dry at 105°C for 24h to obtain the pretreated of wood flour.

[0059] Trifluoropropyltrimethoxysilane is dissolved in ethanol aqueous solution (wherein, the volume ratio of ethanol and water is 80: 20) the concentration of preparation trifluoropropyltrimethoxysilane is 9.17 * 10 -3 mol / L ethanol aqueous solution, adjust the pH value to 3.5 with acetic acid, add ethanol to the pretreated wood flour at a ratio of 0.02 to the mass ratio of trifluoropropyltrimethoxysilane to pretreated wood flour at 60°C In the aqueous solution, stir for 3 hours and filter, dry at 60°C for 24h, and then heat-treat at 120°C for 2h to obtain modified wood powder.

[0060] 40Kg modified wood flour, 58Kg polyvinylidene fluoride and 2Kg maleic anhydride grafted polypropylene were premixed together for 1...

Embodiment 2

[0062] Soak the wood flour with 2mol / L NaOH solution, the bath ratio (i.e. the mass ratio of wood flour to NaOH aqueous solution) is 1:15, then wash with deionized water until neutral, and then dry at 105°C for 24h to obtain the pretreated of wood flour.

[0063] Dissolve heptadecafluorodecyltrimethoxysilane in aqueous ethanol (wherein the volume ratio of ethanol to water is 80:20) to prepare heptadecafluorodecyltrimethoxysilane with a concentration of 3.52×10 -3 mol / L ethanol aqueous solution, adjust the pH value to 3.5 with acetic acid, add the pretreated wood flour at 60°C according to the mass ratio of heptadecafluorodecyltrimethoxysilane to pretreated wood flour is 0.02 in ethanol aqueous solution, stirred for 1 hour, filtered, dried at 60°C for 24h, and then heat-treated at 120°C for 2h to obtain modified wood powder.

[0064] 40Kg modified wood flour, 58Kg polyvinylidene fluoride and 2Kg maleic anhydride grafted polypropylene were premixed together for 10min in a SHR-1...

Embodiment 3

[0066] Soak the wood flour with 0.1mol / L NaOH solution, the bath ratio (i.e. the mass ratio of wood flour to NaOH aqueous solution) is 1:20, then wash with deionized water until neutral, and then dry at 105°C for 24h to obtain pretreatment over wood flour.

[0067] Trifluoropropyltrimethoxysilane is dissolved in ethanol aqueous solution (wherein, the volume ratio of ethanol and water is 80: 20) the concentration of preparation trifluoropropyltrimethoxysilane is 4.6 * 10 -4 mol / L ethanol aqueous solution, adjust the pH value to 6.5 with acetic acid, add ethanol at a ratio of 0.001 to the mass ratio of trifluoropropyltrimethoxysilane to pretreated wood flour at 60°C In the aqueous solution, stir for 5 hours and filter, dry at 60°C for 24h, and then heat-treat at 100°C for 3h to obtain modified wood powder.

[0068] Premix 40Kg modified wood flour, 58Kg polyvinylidene fluoride and 2Kg maleic anhydride grafted polypropylene in a SHR-10A high-speed mixer (Zhangjiagang Light Indust...

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Abstract

The invention discloses a wood-plastic composite material, which is prepared from the following raw materials in percentage by weight: 1-70% of modified wood powder, 25-99% of polymer matrix and 0-5% processing aid. The invention also discloses a preparation method of the wood-plastic composite material. The method is as follows: fluorine silane coupling agent is utilized to carry out treatment on surface of the wood powder, the modified wood powder and the polymer matrix are melted and compounded to prepare the wood-plastic composite material, and the wood powder is pretreated by alkali liquor to remove unstable substances, such as semi-cellulose and esters with small molecules, in the wood powder, thus enhancing the composite effect and the mechanical property of lignocellulose to the polyolefin matrix and obtaining excellent mechanical property, low water absorption capacity, and better apparent form; in addition, the operation of the preparation method is simple, and the method is applicable to industrial production.

Description

technical field [0001] The invention relates to the field of composite materials, in particular to a wood-plastic composite material and a preparation method thereof. Background technique [0002] Wood-plastic composite (WPC) is prepared by compounding thermoplastics and plant fibers. This material has physical and mechanical properties equivalent to hardwood such as compression resistance and impact resistance. Its thermal expansion and water absorption are smaller than wood, so it can be widely used. Used in indoor and outdoor floors, doors, wall panels, flower boxes, fences, tables, chairs and stools, various bridges, pavilions, frames and other outdoor buildings. When wood-plastic composite materials are used outdoors, their UV durability is poor, because the aging resistance of wood powder and ordinary plastics is not good. The addition of wood powder accelerates the photodegradation of WPC. The accelerated weather resistance test of WPC products found It has fading an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08L27/18C08L27/14C08L27/20C08L27/12C08L97/00C08L51/06
Inventor 周箭杨辉
Owner ZHEJIANG UNIV
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