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Wood-plastic composite material with high strength and biological durability and preparation method thereof

A wood-plastic composite material and modification technology, applied in the field of composite materials and wood-plastic composite materials, can solve the problems of high cost of plastics and products easily eroded by fungi, improve mechanical strength, improve anti-fungal erosion effect, and improve interface associative effect

Active Publication Date: 2019-12-10
SOUTHWEST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: How to simultaneously solve the problems of high plastic cost and easy fungal erosion of the common wood-plastic composite materials in the preparation of raw materials is also a current technical problem.

Method used

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  • Wood-plastic composite material with high strength and biological durability and preparation method thereof
  • Wood-plastic composite material with high strength and biological durability and preparation method thereof
  • Wood-plastic composite material with high strength and biological durability and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The lignin modification method of the present embodiment is carried out as follows:

[0038] Lignin modification: Dissolve lignin in 1mol / L sodium hydroxide solution, adjust the pH of the solution to 11, heat in a water bath, and add 37% formaldehyde after reaching a reaction temperature of 80°C. The mass ratio of lignin to formaldehyde is 2: 1. After reacting for 2 hours, cool to room temperature, adjust the pH value of the solution to 2 with 12% hydrochloric acid, centrifuge the precipitated modified lignin, rinse with distilled water, and dry in a blast dryer at 50°C to obtain modified lignin .

[0039] The preparation method of the wood-plastic composite material of the present embodiment comprises the following steps:

[0040] Drying: Dry the modified lignin at 50°C for 24 hours, and dry the wood powder at 102°C for 4 hours;

[0041] Mixture: 10% modified lignin; 50% wood flour; 20% density 0.93g / cm 3 polyethylene; the content of 10% compatibilizer, the compatib...

Embodiment 2

[0045] The lignin modification method of the present embodiment is carried out as follows:

[0046] Dissolve lignin in 1mol / L sodium hydroxide solution, adjust the pH of the solution to 11, heat in a water bath, and add 37% formaldehyde after reaching a reaction temperature of 90°C. The mass ratio of lignin to formaldehyde is 3:1, and react for 2 hours. Cool to room temperature, adjust the pH value of the solution to 2 with 12% hydrochloric acid, then centrifuge the precipitated modified lignin, rinse with distilled water, and dry in a blast dryer at 50°C to obtain modified lignin.

[0047] The preparation method of the wood-plastic composite material of the present embodiment comprises the following steps:

[0048] Drying: Dry the modified lignin at 50°C for 24 hours, and dry the wood powder at 105°C for 4 hours;

[0049] Mixture: 10% modified lignin; 50% wood flour; 25% density 0.90g / cm 3 The polyethylene; compatibilizer, filler, lubricant and dispersant are mixed in a hig...

Embodiment 3

[0054] The lignin modification method of the present embodiment is carried out as follows:

[0055] Dissolve lignin in 1mol / L sodium hydroxide solution, adjust the pH of the solution to 11, heat in a water bath, and add 37% formaldehyde after reaching the reaction temperature of 90°C. The mass ratio of lignin to formaldehyde is 3:1, and react for 3 hours. Cool to room temperature, adjust the pH value of the solution to 3 with 12% hydrochloric acid, then centrifuge the precipitated modified lignin, wash it with distilled water, and dry it in a blast dryer at 60°C to obtain modified lignin.

[0056] The preparation method of the wood-plastic composite material of the present embodiment comprises the following steps:

[0057] Drying: Dry the modified lignin at 60°C for 24 hours, and dry the wood powder at 105°C for 4 hours;

[0058] Mixture: the content of modified lignin is 15%; the content of wood powder is 45%; the density is 0.96g / cm 3 The polyethylene content is 25%; the c...

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Abstract

The invention relates to a wood-plastic composite material with high strength and biological durability and a preparation method thereof. The wood-plastic composite material is prepared from the following raw materials in percentage by mass: 10-20% of modified lignin, 40-50% of wood powder, 20-25% of polyethylene with the density being 0.90-0.96 g / cm3, 5-10% of a compatilizer, 8% of a filler, 1% of a lubricant and 1% of a dispersant. The lignin is subjected to hydroxymethylation modification, compared with lignin not modified, the interface binding strength of the obtained wood-plastic composite material can be improved better, and then the mechanical strength is improved. Meanwhile, the fungal erosion resisting effect of the wood-plastic composite material is significantly improved, in the aging process of the composite material, the biological durability of the composite material can be improved, and wide application prospects are achieved.

Description

technical field [0001] The invention relates to a composite material, especially a wood-plastic composite material with high strength and biological durability, and a preparation method thereof, which belongs to the field of wood-plastic composite materials. Background technique [0002] Wood-Plastic Composites (WPC) is abbreviated as WPC, which mainly refers to a kind of high-performance, high value-added green and environmentally friendly composite materials composed of polyethylene, polypropylene and other plastics and wood fiber materials. The cost of plastic is high, and because wood-plastic composites contain a certain amount of wood fibers, when they are used in outdoor environments for a long time, sunlight, rain, and suitable temperatures provide objective conditions for the growth of fungi, so they are vulnerable to environmental damage. The influence of microorganisms such as fungi and bacteria can lead to mildew, decay and deterioration to reduce the service life...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L97/02C08L97/00C08L23/06C08K3/26
CPCC08K2003/265C08L97/02C08L2205/035C08L97/005C08L23/06C08K3/26
Inventor 夏炎赵毅力罗蓓徐志伟李方方
Owner SOUTHWEST FORESTRY UNIVERSITY
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