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Method for modifying wood and bamboo wood through biopolymer-chitosan

A technology of chitosan modification and biopolymer, which is applied in the direction of humidity control wood, impregnated wood, wood impregnation, etc., can solve the problems of reduced wood strength, low solubility, environmental pollution, etc., to improve dimensional stability and hardness, The effect of preventing moisture absorption and avoiding environmental pollution

Active Publication Date: 2016-09-28
JIANGSU SHENGYU FLOORING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of modification method has the following defects: ① When weak acid is used as solvent, the presence of a large amount of acid will easily acidify the wood at high temperature, resulting in a decrease in wood strength and affected properties; ② The solubility of weak acid to chitosan Small, a small amount of chitosan can only stay on the surface of the wood and cannot enter the interior of the wood matrix to form an effective chitosan film; ③ Organic solvents generally need 100~200°C during use, so they are easy to volatilize and cause environmental pollution

Method used

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  • Method for modifying wood and bamboo wood through biopolymer-chitosan
  • Method for modifying wood and bamboo wood through biopolymer-chitosan
  • Method for modifying wood and bamboo wood through biopolymer-chitosan

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Take poplar wood with a specification of 50mm×50mm×30mm (length×width×thickness) as the base material, vacuum-dry it at 102±3°C for 24 hours, then take out the poplar wood specimen for humidity control, and adjust the moisture content of the specimen to 9% in a sealed desiccator.

[0027] Take by weighing the 1-ethyl-3 methyl imidazolium chloride ionic liquid of 10g, then weigh chitosan 0.2g by 2% of its mass ratio and add in the 1-ethyl-3 methyl imidazolium chloride ionic liquid, then Stir evenly in a water bath at 90°C for 30 minutes until the chitosan mixed solution is completely dissolved into a light yellow transparent liquid, then stop heating and stirring, then take the completely dissolved chitosan solution out of the water bath and cool to room temperature After that, put it into a water bath at 40°C, and put the poplar wood specimen after the humidity adjustment treatment into the chitosan solution. Dipping, the total immersion time is 25 minutes, finally tak...

Embodiment 2

[0029] Take poplar wood with a specification of 50mm×50mm×30mm (length×width×thickness) as the base material, vacuum-dry it at 102±3°C for 24 hours, then take out the poplar wood specimen for humidity control, and adjust the moisture content of the specimen to 8% in a sealed desiccator.

[0030] Take by weighing the 1-ethyl-3 methyl imidazolium chloride ionic liquid of 10g, then weigh chitosan 0.5g by 5% of its mass ratio and add in the 1-ethyl-3 methyl imidazolium chloride ionic liquid, then Stir evenly in a water bath at 75°C for 20 minutes until the chitosan mixed solution is completely dissolved into a light yellow transparent liquid, then stop heating and stirring, then take the completely dissolved chitosan solution out of the water bath and cool to room temperature After that, put it into a water bath at 75°C, and put the poplar wood specimen after the humidity adjustment treatment into the chitosan solution. Dipping, the total immersion time is 20 minutes, finally tak...

Embodiment 3

[0032] Take poplar wood with a specification of 50mm×50mm×30mm (length×width×thickness) as the base material, vacuum-dry it at 102±3°C for 24 hours, then take out the poplar wood specimen for humidity control, and adjust the moisture content of the specimen to After 10%, put it in a sealed desiccator.

[0033]Take by weighing the 1-ethyl-3 methyl imidazolium chloride ionic liquid of 10g, then weigh chitosan 0.8 g by 8% of its mass ratio and add in the 1-ethyl-3 methyl imidazolium chloride ionic liquid, then Stir evenly in a water bath at 95°C for 35 minutes until the chitosan mixture solution is completely dissolved into a light yellow transparent liquid, then stop heating and stirring, then take the completely dissolved chitosan solution out of the water bath and cool to room temperature After that, put it into a water bath at 45°C, and put the poplar wood specimen after the humidity adjustment treatment into the chitosan solution. After soaking for 5 minutes, change the posi...

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Abstract

The invention provides a method for modifying wood and bamboo wood through biopolymer-chitosan. The method is characterized in that 1-ethyl-3-methyl imidazole chloride ionic liquid serves as a solvent, the chitosan is dissolved under the heating condition, and uniform and stable chitosan liquid is formed; and then fast-growing wood or bamboo wood is subject to modified treatment, the chitosan liquid with the 1-ethyl-3-methyl imidazole chloride ionic liquid as the solvent is easily diffused to the surface layers of wood / bamboo materials, and uniform chitosan layers are formed in wood / bamboo base materials after heating and drying. The modified wood / bamboo wood has the better size stability and antifungal and antibacterial performance; and meanwhile, the hardness is improved to a certain degree.

Description

technical field [0001] What the present invention relates to is a kind of method utilizing biopolymer-chitosan to modify wood and bamboo, specifically a kind of carrier that uses 1-ethyl-3 methyl imidazolium chloride ionic liquid as chitosan, to wood The invention relates to a method for modifying bamboo or bamboo, belonging to the field of wood science and technology. Background technique [0002] Wood and bamboo products mainly have defects such as deformation, cracking, mold, and decay during use. Therefore, how to improve the dimensional stability, anti-mold and anti-bacterial properties of products through physical or chemical methods has always been a hot spot in the wood processing industry. . [0003] Chitosan is a natural linear polymer with large molecular weight, strong adsorption, and good biocompatibility with cellulose. Applications are getting more and more attention. The research results show that chitosan has good impregnation performance, can bridge betw...

Claims

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Application Information

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IPC IPC(8): B27K3/04B27K1/00B27K3/50
CPCB27K1/00B27K3/04B27K3/50
Inventor 何文蒋身学张齐生
Owner JIANGSU SHENGYU FLOORING
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