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Preparation method for wood-bamboo reinforced resin composite material based on high-pressure densification

A composite material and reinforced resin technology, applied in the direction of wood impregnation, wood treatment, impregnated wood, etc., can solve the problem of low added value of products, and achieve the effect of promoting green development, simple and reasonable process, and low price

Active Publication Date: 2018-11-09
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, wood is mainly used in traditional fields such as furniture manufacturing, paper pulping, and wood-based panel production, and the added value of the product is low, which does not match the structural characteristics of wood itself.

Method used

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  • Preparation method for wood-bamboo reinforced resin composite material based on high-pressure densification

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preparation example Construction

[0040] The present invention is based on high-pressure compacted wood and bamboo reinforced resin composite material and preparation method thereof, comprising the following specific steps:

[0041] (1) Partial lignin and hemicellulose removal process: the starting raw material is wood veneer or waste board or bamboo sheet, using professional chemical reagents to remove part of lignin and hemicellulose in wood or bamboo, and washing with water Remove chemicals from lignin and hemicellulose wood or bamboo, and then use ethanol or acetone to replace the water in wood or bamboo;

[0042] The veneer is a wood board cut radially, chordwise or transversely from the wood, and the wood species is not particularly limited. The waste board is any discarded wood board, plywood, etc., without special limitation. The bamboo sheet is a sheet cut from bamboo, and the bamboo species include green bamboo, moso bamboo, and Ci bamboo. The thickness of the veneer, waste board, and bamboo sheet i...

Embodiment 1

[0063] Put poplar veneer (100mm×100mm×1mm) into NaOH (2.0mol / L) and NaOH at 80°C 2 SO 3 (0.5mol / L) mixed solution soaked for 2h, remove part of the lignin and hemicellulose in the veneer (removal rate is 50%), then use deionized water to repeatedly clean the veneer many times, remove excess chemical The substance was cleaned, and 5 similar veneers were prepared repeatedly, and then put into absolute ethanol, soaked for 30 minutes, and the water in the veneers was replaced. Flame retardant 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and octaphenyl cage silsesquioxane (both additions are respectively 1% of resin weight) 5wt.%, 10wt.% in total), curing agent diphenyl sulfone (addition amount is 25wt.% of resin weight) added to E51 epoxy resin, stirred evenly, and then put the veneer into the resin mixing system, through vacuum impregnation The method is to infiltrate the resin into the veneer. Under vacuum conditions, the pressure in the vacuum tank is -0.02MPa, a...

Embodiment 2

[0065] Put poplar veneer (100mm×100mm×1mm) into NaOH (2.0mol / L) and NaOH at 80°C 2 SO 3 (0.5mol / L) mixed solution soaked for 2h, remove part of the lignin and hemicellulose in the veneer (removal rate is 40%), then use deionized water to repeatedly wash the veneer many times, remove excess chemical Clean the substance, then put it into acetone, soak for 30min, and replace the moisture in the wood; repeat the preparation of 4 similar veneers, and dry them naturally; then put them into a phenolic resin solution with a solid content of 25wt.%. Immerse in water for 10 minutes, take out the veneer, and let it dry naturally. Then put the veneer into an aqueous solution containing ammonium polyphosphate flame retardant (dimethyl methyl phosphate, the concentration of the flame retardant is 10wt.%) and soak for about 25min, so that the weight gain of the veneer reaches 10% (the weight gain of the flame retardant ), take out the veneer and let it dry again. Then five pieces of venee...

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Abstract

The invention relates to a preparation method for a wood-bamboo reinforced resin composite material based on high-pressure densification, and belongs to the field of composite materials and artificialboards. The preparation method for the wood-bamboo reinforced resin composite material based on the high-pressure densification comprises the steps that lignin and hemicellulose are partially removedfrom wood veneers, wood boards or bamboo sheets by a chemical reagent, the chemical reagent is removed by water, and the water is replaced by ethanol or acetone; the wood veneers, the wood boards orthe bamboo sheets with lignin and hemicelluloses removal are put into a mixed solution of a resin system or a resin solution and a flame retardant, a diluent and / or a toughening agent additive, or sequentially put into the resin system or the resin solution and the mixed solution of the additive, so that the resin and additive penetrate into cells and cell pores of the wood or the bamboo; and semi-finished products are assembled into blanks, and high-pressure densification and high-temperature curing are carried out to prepare the high-strength composite material. The preparation method for the wood-bamboo reinforced resin composite material based on the high-pressure densification overcomes the stress concentration problem caused by the pores and the like in an existing artificial board,and the prepared novel structural composite material has good mechanical properties and flame retardancy, so that the application of wood in the structural fields of airplanes, high-speed trains, buildings and the like are greatly promoted.

Description

technical field [0001] The invention relates to a method for preparing wood and bamboo reinforced resin composite materials based on high-pressure densification, using wood or bamboo as a reinforcement to prepare a new type of high-strength structural composite material, which can be applied to high-strength aircraft, high-speed rail, buildings, etc. The field of structure belongs to the field of composite materials and wood-based panels. Background technique [0002] Fiber-reinforced resin-based composite materials are composite materials formed by reinforcing fiber materials and resins through winding, molding or pultrusion molding processes, due to their high specific strength, large specific modulus, performance designability, and good durability. The characteristics enable the material to meet the needs of modern structures that are large-span, high-rise, heavy-duty, light-weight and high-strength, and work under harsh conditions. It is more and more widely used in airc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/08B27K3/02B27K3/52B27K3/00B27K9/00
CPCB27D1/08B27K3/005B27K3/02B27K3/0207B27K3/52B27K9/002B27K2240/15B27K2240/30
Inventor 唐启恒郭文静
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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