Preparation method of high strength and high toughness bamboo plywood

A high-toughness, bamboo plywood technology, which is applied in the jointing of wooden veneers, flat products, manufacturing tools, etc., can solve problems such as poor strength, toughness, weak integrity, and easy cracking of the surface, and achieve chemical bonding. The effect of increasing, improving cohesion, and improving toughness

Inactive Publication Date: 2018-09-07
湖北鑫晨光建设工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention is aimed at places where the common bamboo plywood generally has weak integrity, relatively poor strength, toughness and other performance aspects, and the flexural strength and impact resistance strength cannot meet the higher requirements in this respect. And the defect that the surface layer is easy to crack after long-term use provides a preparation method for high-strength and high-toughness bamboo plywood

Method used

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  • Preparation method of high strength and high toughness bamboo plywood

Examples

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Comparison scheme
Effect test

example 1

[0026] Select a bamboo curtain with a size of 460mm×460mm×2mm, put the bamboo curtain into a high-pressure cooker, add a sodium hydroxide solution with a concentration of 0.5mol / L into the high-pressure cooker until the bamboo curtain is completely submerged, and seal the high-pressure Cooking pot, increase the pressure in the high-pressure cooking pot to 1.5MPa, heat and boil for 6 hours to obtain pretreated bamboo curtains; after the above-mentioned heating and boiling treatment is completed, immediately take out the pretreated bamboo curtains and put them into an autoclave with an air inlet , then add the water of 10 times of the quality of phenol and bamboo curtain quality such as pretreatment bamboo curtain in the autoclave and the sodium hydroxide of bamboo curtain quality 5%, seal reactor; Feed steam until the pressure in the reactor reaches 1.0MPa, stop feeding steam and raise the temperature of the reactor to 175°C, stir and react at a speed of 200r / min for 50min, afte...

example 2

[0028]Select a bamboo curtain with a size of 460mm×460mm×2mm, put the bamboo curtain into a high-pressure cooker, add a sodium hydroxide solution with a concentration of 0.5mol / L into the high-pressure cooker until the bamboo curtain is completely submerged, and seal the high-pressure Cooking pot, increase the pressure in the high-pressure cooking pot to 1.7MPa, heat and boil for 7 hours, and obtain the pretreated bamboo curtain; after the above-mentioned heating and boiling treatment is completed, immediately take out the pretreated bamboo curtain and put it into an autoclave with an air inlet , then add the water of 12 times of the phenol of quality such as pretreatment bamboo curtain and bamboo curtain quality and the sodium hydroxide of bamboo curtain quality 5% in autoclave, seal reactor; Feed steam until the pressure in the reactor reaches 1.1MPa, stop feeding steam and raise the temperature of the reactor to 177°C, and stir and react at a speed of 250r / min for 60min. Aft...

example 3

[0030] Select a bamboo curtain with a size of 460mm×460mm×2mm, put the bamboo curtain into a high-pressure cooker, add a sodium hydroxide solution with a concentration of 0.5mol / L into the high-pressure cooker until the bamboo curtain is completely submerged, and seal the high-pressure Cooking pot, increase the pressure in the high-pressure cooking pot to 2.0MPa, heat and boil for 8 hours to obtain pretreated bamboo curtains; after the above-mentioned heating and boiling treatment is completed, immediately take out the pretreated bamboo curtains and put them into an autoclave with an air inlet , then add the water of 15 times of the phenol of quality such as pretreatment bamboo curtain and bamboo curtain quality and the sodium hydroxide of bamboo curtain quality 5% in autoclave, seal reactor; Feed steam until the pressure in the reactor reaches 1.2MPa, stop feeding steam and raise the temperature of the reactor to 180°C, stir and react at a speed of 300r / min for 70min, after th...

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Abstract

The invention discloses a preparation method of high strength and high toughness bamboo plywood, belonging to the technical field of preparation of bamboo plywood. Amorphous fibers are converted intoa plasticized state from a glassy state, so that the fibers are initially softened and even become monosaccharide or polyxylose, and furfural is finally produced; then, a bamboo curtain for producingfurfural and phenol are condensed or polycondensed (resinified) under the alkaline condition; the finally formed polymer resin is connected between fibers of the bamboo curtain; due to the existence of the polymer resin, the toughness of the fibers of the bamboo curtain is greatly enhanced, and the toughness of the bamboo plywood, which is finally made by carrying out hot-pressing on the bamboo curtain, is also improved; due to the improvement of cohesion, the physical and mechanical strength of the bamboo plywood is also improved. According to the preparation method, self-made alkaline ligninis obtained by means of alkali pickling and acid precipitation, and self-made phenolic rubber is obtained by mixing alkaline lignin into phenolic resin; due to the generation of a resultant force ofchemical bonds, the cohesion of the fibers of the bamboo curtain is also greatly improved, and the physical and mechanical strength of the final bamboo plywood is directly improved; therefore, the high strength and high toughness bamboo plywood has a broad application prospect.

Description

technical field [0001] The invention discloses a preparation method of high-strength and high-toughness bamboo plywood, which belongs to the technical field of bamboo plywood preparation. Background technique [0002] Bamboo rubber sheets can be divided into cloth rubber sheets, cloth rubber sheets, insulating rubber sheets, oil-resistant rubber sheets, etc. according to their physical and chemical properties. It has a wide range of uses and is suitable for horizontal formwork, shear walls, vertical wall panels, bridges, viaducts, etc. in house construction. Bamboo plywood is a building material made of moso bamboo as the main structure and filling material. It is formed into blanks under high pressure. Due to its high hardness, bending resistance and compression resistance, bamboo plywood has replaced steel formwork in many areas of use, and because bamboo is easy to cultivate The fast-growing forests can be felled in three to five years and can replace wood. Therefore, th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27K9/00B27K5/00B27K3/20B27K3/52B27K5/04B27D1/08B27G11/00
CPCB27D1/08B27G11/00B27K3/20B27K3/52B27K5/001B27K5/04B27K9/002B27N3/02
Inventor 裴泽民张晶陈可
Owner 湖北鑫晨光建设工程有限公司
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