A method for manufacturing ultra-high-density ultra-high-strength plant fiberboard

Abstract

The invention relates to a manufacturing method of an ultrahigh-density and ultrahigh-intensity plant fiber board. The manufacturing method comprises the following steps: by taking dry plant fiber as a raw material, preparing gum-containing fiber by adopting continuous processes of "cold prepressing for assembling, spraying of gum liquid, cold high pressure breathing degumming and air flow drying", and directly putting the gum-containing fiber into high-temperature and high-pressure equipment for high-temperature and high-pressure curing, thus obtaining the ultrahigh-density and ultrahigh-intensity plant fiber board. For the obtained fiber board, the density is more than 1.1 g / cm<3>, the static bending intensity is more than 70 MPa, the elastic modulus is more than 7 GPa, the thickness swelling rate of water absorption is less than 5 percent, and the water absorption rate is less than 5 percent; and a new idea is provided for solving the phenomenon of homogenization among fiber board products in China and expanding new application of plant fiber materials. The manufacturing method promotes continuous production of the ultrahigh-intensity plant fiber board, also promotes application of the plant fiber board in high-additional-value fields of building ornaments and interior trim parts in airplanes and G-series high-speed trains, and promotes greening development of composite materials.

Description

technical field [0001] The invention relates to a manufacturing method of ultra-high-density and ultra-high-strength plant fiber boards. The ultra-high-density and ultra-high-strength fiber boards are prepared by using the continuous process of "pre-cold pressing blanks-glue spraying-cold high-pressure degumming-airflow drying" , the density of the composite board is greater than 1.10g / cm 3 , the static bending strength is greater than 70MPa, and the elastic modulus is greater than 7GPa. The invention can promote the application of plant fiber boards in high value-added fields such as aircraft and high-speed rail interior parts, building curtain walls, etc., promote the green development of composite materials, and provide solutions for solving the homogeneity phenomenon among fiber board products in my country and expanding new uses of plant fiber materials. new ideas. Background technique [0002] In recent years, my country's medium and high density fiberboard industry h...

AI Technical Summary

Problems solved by technology

[0004] At present, in the production of ultra-high-density fiberboard, the patent CN 102275198 A (a preparation method of anti-folding board, application number: 201110226853.3) discloses a method of making fibers from biological waste, and then gradually adding 78- 89% phenolic resin adhesive, prepared with a density of 1.45g / cm 3 High-density boards, the patent uses the spraying method, the adhesive can only be evenly distributed on the surface of the fiber, and cannot enter the internal pores of the fiber at all, which cannot solve the problem of stress concentration caused by the internal pores of the fiber, and cannot improve the mechanical properties of the product, and the patent The physical and mechanical properties of the product have not been announced

Patent CN 101934548 A (a wood-based panel and its preparation method, application number: 201010250879.7) discloses a wood-based panel prepared by impregnating an adhesive with a density of 0.6-2.5g / cm 3 , the static bending strength is 30-75MPa, the water absorption thickness expansion rate is 8%, and the raw material is a fixed-thickness sheet unit instead of fiber, which leads to the limitation of lack of large-diameter logs in production, the raw material utilization rate is not high, and fixed The thick sheet unit impregnation process cannot achieve continuous and automatic production, and the efficiency is extremely low

[0005] Therefore, it is impossible to continuously and automatically produce fiberboard with ultra-high density and excellent mechanical properties by using the existing wood-based panel equipment and technology. At the same time of microstructure, it also improves the comprehensive utilization rate of wood materials, and produces ultra-high-density, ultra-high-strength fiberboard with excellent physical and mechanical properties. Through supply-side reform, it promotes the transformation and upgrading of the fiberboard industry

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