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Method of utilizing compound enzyme improved straw particle and urea acetal resin glue performance

A technology of urea-formaldehyde resin and compound enzyme, which is applied in the field of manufacturing straw particleboard, can solve the problems affecting the bonding performance and achieve the effect of improving the bonding performance

Inactive Publication Date: 2008-06-25
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the adhesives used in the production of wood particleboard are mainly urea-formaldehyde resins with lower prices, while the production of rice (wheat) straw particleboards cannot use urea-formaldehyde resin adhesives, and it is necessary to use higher-priced isocyanates as adhesives to produce qualified products. The reason is that rice (wheat) straw ) The surface of straw shavings contains more wax and silica, which affects the bonding performance between rice (wheat) straw shavings and urea-formaldehyde resin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Example 1, first use a grass cutter to process rice and wheat straw into a 20mm straw unit, then process it into a crushed unit with a pulverizer, place it in an enzyme treatment reactor, add pH 5.0 citric acid-phosphoric acid to 1 kg of straw Sodium dihydrogen buffer solution 20kg, add the enzyme liquid (concrete amount is in the following ratio) of an amount of compound enzyme simultaneously, this compound enzyme comprises xylanase, cellulase and lipase, the proportioning xylanase between them: Cellulase: lipase=(100IU / g raw material): (50FPU / g raw material): (100IU / g raw material), 4 hours of treatment time in enzyme treatment reactor, 40 ℃ of treatment temperatures; Treated rice (wheat ) the straw shavings are dried (at a temperature of 80°C) so that the moisture content of the straw shavings reaches 3%, and 12% of urea-formaldehyde resin adhesive (absolutely dry resin / absolutely dry straw shavings) is applied; Pressing and post-processing processing. Among them, t...

Embodiment 2

[0007] Example 2, first use a grass cutter to process rice and wheat straw into a 25mm straw unit, then process it into a crushed unit with a pulverizer, place it in an enzyme treatment reactor, add pH 5.0 citric acid-phosphoric acid to 1 kg of straw Sodium dihydrogen buffer solution 20kg, add the enzyme liquid (concrete amount is in the following ratio) of an amount of compound enzyme simultaneously, this compound enzyme comprises xylanase, cellulase and lipase, the proportioning xylanase between them: Cellulase: lipase=(150IU / g raw material): (60FPU / g raw material): (200IU / g raw material), 8 hours of processing time in the enzyme treatment reactor, 50 ℃ of processing temperatures; Treated rice (wheat ) the straw shavings are dried (at a temperature of 100°C) to make the moisture content of the straw shavings reach 5%, and 14% of urea-formaldehyde resin adhesive (absolutely dry resin / absolutely dry straw shavings) is applied; Pressing and post-processing processing. Among th...

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PUM

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Abstract

The invention relates to a method for using compound enzyme to improve gluing property between straw shavings and urea-formaldehyde resin, of which technique steps are as follows: (1) straws are processed into shaving units of straw units with a length of 20-25mm though a straw cutter before being put into an enzyme processing reactor; (2) 20kg citric acid-sodium dihydrogen phosphate buffer solution with pH5.0 is added into 1kg straws, in which enzyme solution of the compound enzyme is then added, (3) processing time in the enzyme processing reactor is 4 to 8 hours and processing temperature is 40 to 50 DEG C; (4) the straw shavings after being processed is dried and the temperature of 80-100 DEG C causes the moisture content of the straw shavings to reach 3-5 percent; (5) 12-14 percent (percentage between absolute resin and absolute dry straw shavings) of urea-formaldehyde resin adhesive is added into the straw shavings obtained in the step (4); (6) the straw shavings are formed, precompressed, thermocompressed through a mechanical forming machine and conducted post treatment processing steps. The invention has the advantages that the compound enzyme improves the gluing property between the straw shavings and the urea-formaldehyde resin, thus producing qualified products.

Description

technical field [0001] The invention relates to a method for improving the bonding performance between rice (wheat) straw shavings and urea-formaldehyde resin by using a compound enzyme. The invention belongs to the technical field of manufacturing straw particle boards. Background technique [0002] At present, the adhesives used in the production of wood particleboard are mainly urea-formaldehyde resins with lower prices, while the production of rice (wheat) straw particleboards cannot use urea-formaldehyde resin adhesives, and it is necessary to use higher-priced isocyanates as adhesives to produce qualified products. The reason is that rice (wheat) straw ) The surface of straw shavings contains more wax and silica, which affects the bonding performance between rice (wheat) straw shavings and urea-formaldehyde resin. Contents of the invention [0003] The purpose of the present invention is to improve the bonding performance between straw shavings and urea-formaldehyde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27N1/00B27N1/02B27N3/08B27N3/18
Inventor 张洋江华周定国周兆兵贾翀张逸佳张一萍陈曦曦高翔
Owner NANJING FORESTRY UNIV
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