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A kind of phosphating wood and preparation method thereof

A technology of wood and phosphate ester, which is applied in the direction of wood impregnation, wood treatment, impregnated wood, etc., can solve the problems of improving the dimensional stability and flame retardancy of wood, and achieve the improvement of degree of substitution, reaction efficiency, dimensional stability and Improvement of biodestruction resistance and excellent effect of biodestruction resistance

Active Publication Date: 2020-05-08
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The above research work has achieved some gratifying results, but there is still a problem that it is impossible to improve the dimensional stability and flame retardancy of wood.

Method used

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  • A kind of phosphating wood and preparation method thereof
  • A kind of phosphating wood and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A kind of preparation method of phosphating wood of the present invention, comprises the following steps:

[0043](1) Process the wood into three kinds of specification test materials: 20(R)*20(R)*300(L)mm (mechanical performance test piece), 20mm*20mm*20mm (volume wet expansion test piece) and 100mm*100mm*10mm (flame retardant mechanical performance test piece), and numbered in sequence;

[0044] (2) Immerse poplar sapwood in NaOH solution with a mass fraction of 10%, alkalinize and impregnate at room temperature for 12 hours, then take out the plank and rinse it with deionized water for 2-3 times, and then dry it to a moisture content of about 8% ;

[0045] (3) Get 10g urea and 15g disodium hydrogen phosphate to be dissolved in 120g water, prepare reaction solution;

[0046] (4) Seal the wood after step (2) in the impregnation reaction tank, vacuumize the impregnation reaction tank, vacuumize to below 0.1MPa, then inject the reaction solution obtained after step (3)...

Embodiment 2

[0050] A kind of preparation method of phosphating wood of the present invention, comprises the following steps:

[0051] (1) Process the wood into three kinds of specification test materials: 20(R)*20(R)*300(L)mm (mechanical performance test piece), 20mm*20mm*20mm (volume wet expansion test piece) and 100mm*100mm*10mm (flame retardant mechanical performance test piece), and numbered in sequence;

[0052] (2) Immerse poplar sapwood in NaOH solution with a mass fraction of 10%, alkalinize and impregnate at room temperature for 12 hours, then take out the plank and rinse it with deionized water for 2-3 times, and then dry it to a moisture content of about 8% ;

[0053] (3) get 20g urea and 15g disodium hydrogen phosphate to be dissolved in 120g water, prepare reaction solution;

[0054] (4) Seal the wood after step (2) in the impregnation reaction tank, vacuumize the impregnation reaction tank, vacuumize to below 0.1MPa, then inject the reaction solution obtained after step (3...

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Abstract

The invention provides a preparation method of phosphating wood. The method comprises the following steps: (1), pre-processing the wood by using alkali liquid; (2), dissolving urea and a phosphate esterification reagent into water and performing mixing to obtain reaction liquid; (3), sealing the wood obtained in the step (1) into a steeping reaction tank, vacuumizing the steeping reaction tank, then injecting the reaction liquid obtained in the step (2) into the steeping reaction tank to ensure that the wood is completely soaked, and then pressurizing to ensure that the wood is continuously soaked; (4), taking the wood obtained in the step (3) out, putting under a low-vacuum environment, and heating to carry out pre-drying and dewatering; (5), putting the wood obtained in the step (4) intoa reaction kettle, performing gradient heating under nitrogen protection so as to carry out phosphate esterification reaction, and then cooling to a room temperature in a gradient manner to obtain the phosphating wood. According to the preparation method disclosed by the invention, the dimension stability of the wood can be improved preferably, and the flame retardant performance and the biological destruction resistance of the wood are improved at the same time. The invention also provides the phosphating wood prepared by adopting the method.

Description

technical field [0001] The invention belongs to the technical field of wood modification, in particular to a phosphating wood and a preparation method thereof. Background technique [0002] Wood is mainly composed of cellulose, hemicellulose and lignin. There are a large number of hydroxyl groups (-OH) on the cellulose and hemicellulose molecules, and the hydroxyl group is hydrophilic. Due to the effect of hydroxyl groups, wood evaporates or absorbs water with changes in external temperature and humidity, resulting in dry shrinkage or wet expansion, resulting in unstable dimensions of the wood, internal stress, warping, deformation and cracking of the wood. People have been trying to find ways to improve the dimensional stability of wood in order to increase the use value of wood. According to the treatment method and effect, Stam m AJ of the United States roughly divides the methods of wood dimensional stability treatment into five categories: [0003] (1) Use the method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B27K3/02B27K3/10B27K5/04B27K5/00
CPCB27K3/0207B27K3/10B27K5/0085B27K5/04
Inventor 黄自知胡云楚袁利萍王文磊文瑞芝王琼吴袁泊李慧邓明向杨田丽陈秋菊
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY