Wood raw material pre-treatment method

A treatment method and pretreatment technology, applied in the direction of wood impregnation, impregnated wood, wood processing equipment, etc., to achieve the effect of improving internal bonding strength, reducing water consumption and energy consumption, and rapidly popularizing and applying

Inactive Publication Date: 2012-06-27
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, laccase is mainly used in the field of pulp bleaching. However, in the field of wood processing, these

Method used

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  • Wood raw material pre-treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The woody raw material used is poplar wood shavings for particleboard production. Weigh 10 g of poplar wood shavings and place them in a 500 mL beaker, and add 200 g of water to form a shavings-water suspension. The suspension was stirred to pH 4 while adding citric acid-sodium citrate buffer. Add laccase to the above suspension with an enzyme amount of 20U / g woody material, place the above suspension in a water bath at 50°C for 2 hours, filter out the soaking solution after the treatment, and dry the woody material at 60°C for 3 hours . At the same time, make blank, water treatment, and inactivated laccase treatment as controls, observe the surface structure of woody raw materials treated in different ways under an electron microscope, and make particleboard, and measure its internal bonding strength according to the method described in GB / T 17657-1999 , the result is shown below. The results showed that the laccase treatment could loosen the shell-like coating on th...

Embodiment 2

[0018] The woody raw material used is poplar veneer (thickness 1.5cm) used in the production of plywood. Take the poplar veneer and cut it into 3cm×5cm long thin slices. Take 3 pieces (4.6g) and put them in a 250mL beaker, add 100mL of water, and add hydrochloric acid to adjust When the pH reaches 5, add laccase to the above suspension at an enzyme dosage of 30U / g woody material, take it out after incubating at 45°C for 3h, filter out the soaking liquid, and dry the treated poplar veneer in an oven at 70°C for 3h . Simultaneously do the contrast of blank, water treatment, inactivated laccase treatment, adopt OCA40 optical contact angle measuring instrument to carry out surface contact angle measurement to the prepared sample, and make plywood, measure its according to the method described in GB / T 17657-1999 Inner bond strength, the results are shown below.

[0019] Table 2 The wetting angle and wetting work of water on the surface of wood raw materials treated by different me...

Embodiment 3

[0025] The woody material used is poplar solid wood (cut into solid wood blocks with a length of 2.5cm, a width of 2.5cm, and a thickness of 1cm). Take 6 pieces (about 30g) of the solid wood blocks, put them in a 500mL beaker, add 200mL of water, and add dilute sulfuric acid to adjust the pH to 3.5. Add laccase to the above soaking solution with an enzyme amount of 20U / g of woody raw materials, and take it out after 2 hours of incubation at 50°C. After filtering out the soaking solution, the treated poplar solid wood blocks were dried in an oven at 80°C for 2.5 hours, and at the same time, water treatment and inactivated laccase treatment were used as controls. The obtained four groups of wooden blocks were glued with white latex and then pressed and left for 12 hours. HG / T 2727-95 was used to measure the bonding strength and the average value was obtained. The results are shown below.

[0026] Table 4 Effect of different pretreatment methods on the glue strength of poplar sol...

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Abstract

The invention discloses a wood raw material pre-treatment method, belonging to the technical field of wood processing. The wood raw material pre-treatment method comprises the following concrete treatment processes: soaking wood raw material into a soak solution, regulating pH of the soak solution, controlling temperature of the soak solution, adding laccase, and taking out the wood raw material and drying the wood raw material after the wood raw material is under enzyme action for a while. The wood raw material pre-treatment method disclosed by the invention has the advantages that performances of the pretreated wood raw material are changed, namely a surface shell-shaped covering layer of the wood raw material is obviously loose, and partial surface shell-shaped covering layer is removed to form a hole structure; and surface wetting property is obviously improved. During wood processing, the changes of the performances can reduce water consumption and energy consumption in a softening stage, and spreading and penetration of glue solution on the surface of the wood raw material are improved and condensation adhesive and penetration adhesive properties of the glue solution are enhanced, thus the internal bonding strength of a wood product is improved.

Description

technical field [0001] The invention relates to a pretreatment method for woody raw materials, in particular to a process-optimized method for pretreating woody raw materials by adding laccase, and belongs to the technical field of wood processing. Background technique [0002] In recent years, affected by the increasing shortage of timber resources, the development of my country's forestry industry has been restricted to a certain extent. It is an effective measure to solve the contradiction between supply and demand of wood raw materials to develop efficient comprehensive utilization of wood and make full use of logging residues, processing residues and inferior wood. [0003] Wood is mainly composed of cellulose, hemicellulose and lignin, which account for about 97%-99% of the total weight of woody raw materials, of which lignin accounts for about 15%-35% of the total weight of woody raw materials. Lignin is the most abundant natural renewable resource next to cellulose,...

Claims

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Application Information

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IPC IPC(8): B27K3/02
Inventor 顾正彪王鹏程力李兆丰洪雁
Owner JIANGNAN UNIV
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