Preparation method of wood-reinforced thermoplastic resin-based environment-friendly formaldehyde-free composite material

A technology for strengthening thermoplastic and thermoplastic resins. It is used in wood treatment, wood impregnation, wood impregnation, etc. It can solve the problems of reducing material strength, easy creep of wood plastic materials, and loss of structure stability. Anti-corrosion and weather resistance, good stability

Pending Publication Date: 2020-12-15
RES INST OF FORESTRY NEW TECH CHINESE ACAD OF FORESTRY
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wood-plastic industry is an emerging green and environmental protection industry. It saves huge wood consumption for the country every year. In the period when resources are increasingly tight and the country is actively green, environmentally friendly and low-carbon, the development of wood-plastic composite materials has played a huge role in promoting the material industry. However, During the application process, it was found that the cross mechanical properties of the wood-plastic composite material itself can only support the application of the material in the traditional field, and the material is easily affected by chemical and physical factors in the environment, which further reduces the strength of the material, especially in the presence of adverse factors. Under long-term action, wood-plastic materials are prone to creep, making the structure unstable

Method used

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  • Preparation method of wood-reinforced thermoplastic resin-based environment-friendly formaldehyde-free composite material
  • Preparation method of wood-reinforced thermoplastic resin-based environment-friendly formaldehyde-free composite material
  • Preparation method of wood-reinforced thermoplastic resin-based environment-friendly formaldehyde-free composite material

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preparation example Construction

[0034] The preparation method of the wood-reinforced thermoplastic resin-based composite material of the present invention comprises the following steps:

[0035] (1) Rotary cutting of veneer: The solid wood is made into a veneer by the rotary cutting process, and the thickness of the veneer is 50 μm to 3.0 mm.

[0036] (2) Partial lignin removal: place the veneer in the reaction kettle, add an appropriate amount of water, and add a lignin removal agent based on the fact that the water is completely submerged on the veneer, heat it at high temperature and pressure for 5-60 minutes to complete the reaction, and then wash For the veneer, re-add water of the same quality as for cooking, and then add hydrogen peroxide with a mass fraction of 5-20%, boil for 10-30 minutes to complete the reaction, clean the veneer and dry it for later use.

[0037] The de-lignification refers to the wood veneer treated with a removing agent, and the mass of remaining lignin accounts for 30%-100% of...

Embodiment 1

[0046] Poplar was selected as a raw material, and poplar veneers with a thickness of 100 μm were prepared by rotary cutting, and 50 veneers were immersed in a container containing a mixed solution of sodium hydroxide and sodium sulfite (wherein the concentration of sodium sulfite was 1.0 mol / L, The concentration of sodium hydroxide is 0.1mol / L), the volume of the solution is 500mL, at a temperature of 100°C and a pressure of 0.1MPa, boil in water for 30min, then take out the wood veneer and wash it with distilled water for 3 times. Add 500 mL of water to the container again, add hydrogen peroxide (the mass fraction of hydrogen peroxide accounts for 10% of the total solution), boil in water for 1 hour, take it out, wash with distilled water 3 times, and dry. Put the dry wood veneer into the solution containing KH550 coupling agent (mass concentration is 2%) for 2 hours, take it out, place it in the oven to dry for 2 hours (oven temperature 120°C), and then place the wood veneer ...

Embodiment 2

[0048] Poplar was selected as a raw material, and poplar veneers with a thickness of 100 μm were prepared by rotary cutting, and 50 veneers were immersed in a container containing a mixed solution of sodium hydroxide and sodium sulfite (wherein the concentration of sodium sulfite was 1.0 mol / L, The concentration of sodium hydroxide is 0.1mol / L), the volume of the solution is 500mL, at a temperature of 100°C and a pressure of 0.1MPa, boil in water for 30min, then take out the wood veneer and wash it with distilled water for 3 times. Add 500 mL of water to the container again, add 20 mL of hydrogen peroxide (the original concentration of hydrogen peroxide is 36%), boil for 1 hour, take it out, wash with distilled water 3 times, and dry. Align the wood veneers along the same direction, and at the same time add polypropylene resin in the middle of each veneer, and place the compatibilizer PPg-MAH evenly in the resin, the resin mass is 15% of the total mass, the compatibilizer mass ...

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Abstract

The invention relates to a preparation method of a wood-reinforced thermoplastic resin-based environment-friendly formaldehyde-free composite material, and belongs to the field of composite material manufacturing and the field of wood processing. The method comprises the steps of manufacturing the solid wood into veneers by adopting a rotary cutting process; putting the veneers into a lignin removing agent solution to completely immerse the veneers, cleaning the veneers after high-temperature and high-pressure heating, adding water and hydrogen peroxide again, boiling, cleaning the veneers anddrying; soaking the veneers in a soaking solution containing one or more of a coupling agent, a flame retardant and a preservative, taking out the veneers and drying the veneers; unidirectionally aligning and stacking or vertically and horizontally crossing and stacking the veneers, and placing thermoplastic resin between every two adjacent layers of veneers, or placing the thermoplastic resin and a compatilizer at the same time; performing feeding into a cold press for high-pressure pre-pressing, and then heating to melt the thermoplastic resin, so as to obtain the multifunctional high-strength wood-based composite material. The product has extremely high static bending strength, elasticity modulus and surface wear resistance, the thickness expansion rate of the product is small, the dimensional stability is good, and meanwhile, the product is endowed with excellent corrosion resistance and weather resistance.

Description

technical field [0001] The invention relates to a method for preparing a novel wood-based composite material, in particular to a method for preparing a wood-reinforced thermoplastic resin-based environmentally friendly formaldehyde-free composite material, which belongs to the field of composite material manufacturing and wood processing. Background technique [0002] At present, a large number of high-strength composite material products, including carbon fiber composite materials and glass fiber composite materials, are used in high-rise buildings, rail transit, aircraft and shipbuilding and other fields. These products not only require extremely high strength and rigidity, but also must have low cost, environmental friendliness, sustainable utilization and other properties. Although composite materials such as carbon fiber and glass fiber have very high mechanical properties, their manufacturing cost is very high, pollution is large, and they are not recyclable. Therefore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B37/06B32B37/10B32B37/12B27D1/04B27D1/10B27K3/52B27K5/00
CPCB32B37/06B32B37/10B32B37/1207B27K3/52B27K5/00B27D1/04B27D1/10B32B2037/1215
Inventor 唐启恒郭文静常亮
Owner RES INST OF FORESTRY NEW TECH CHINESE ACAD OF FORESTRY
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