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Preparation method of aldehyde-free artificial board

A production method and technology for wood-based panels, applied in the field of wood processing, can solve the problems of formaldehyde release harming the environment and human health, etc., and achieve the effects of tight internal structure, expanded application scope, and avoidance of collapse

Active Publication Date: 2012-08-15
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a production method of formaldehyde-free wood-based panels to solve the problem that formaldehyde release endangers the environment and human health in the current wood-based panel manufacturing industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh 50 g of poplar wood shavings for particleboard production and place them in a 2000 mL beaker, add 1000 g of water to form a shavings-water suspension. Adjust the pH to 4, add laccase to the above suspension with an enzyme amount of 20 U / g poplar wood shavings, place the above suspension in a water bath at 50°C for 2 hours, filter out the soaking solution after the treatment, and place the woody raw material in Dry at 60°C for 3h. After drying, add 7g of starch adhesive to the obtained shavings, mix well and make a slab of 8cm×8cm format, put the slab into a hot press that has been heated to 170°C in advance, keep it warm at 8MPa for 3min, and then increase the pressure to 12MPa , continue to keep warm for 3 minutes, and then take it out after cooling to obtain the prepared particleboard (thickness is 7mm). According to the method described in GB / T 17657-1999, the internal bonding strength and water expansion rate of the obtained particleboard were measured. The r...

Embodiment 2

[0017] Take 3 poplar veneers (thickness 1mm, format 8cm×8cm) 3 pieces (mass 36g) used in the production of plywood, immerse them in 100mL water to adjust the pH to 5, and soak them in the liquid with the amount of enzyme added to 30U / g poplar veneer Add manganese peroxidase, keep warm at 45°C for 3h, take it out, filter out the soaking solution, and dry the treated poplar veneer in an oven at 70°C for 3h. Coat the surface of the dried poplar veneer with 0.5mm of starch adhesive (glue on one side), stack the three veneers and place them in a hot press that has been heated to 150°C in advance, and keep warm at 6MPa for 2 minutes Finally, increase the pressure to 11 MPa, continue to keep warm for 3 minutes, and then take it out after cooling to obtain the plywood (thickness 3mm). The surface bonding strength of the obtained plywood was measured with reference to the method described in GB / T 9846-2004, and the results showed that the surface bonding strength of the obtained plywoo...

Embodiment 3

[0019] Weigh 80g of poplar wood fiber, put it in a 2000mL beaker and add 1000mL of water, adjust the pH to 3.5, add lignin peroxidase to the above soaking solution at an enzyme amount of 40U / g fiber, incubate at 50°C for 2h and filter In addition to the soaking solution, the treated poplar fiber was dried in an oven at 80°C for 2.5h. After drying, add 9g of protein adhesive to the obtained shavings, mix well and make a slab of 8cm×8cm format, put the slab into a hot press that has been heated to 160°C in advance, keep it warm at 8MPa for 3min, and then increase the pressure to 13MPa , continue to keep warm for 4 minutes, and then take it out after cooling to obtain the fiberboard (thickness is 7mm). According to the method described in GB / T11718-1999, the internal bonding strength and water swelling rate of the obtained fiberboard were measured. The results showed that the internal bonding strength of the fiberboard reached 0.62MPa, exceeding the 0.6MPa required by the first-c...

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Abstract

The invention discloses a preparation method of an aldehyde-free artificial board, and belongs to the technical field of wood processing. The invention provides a method for preparing an artificial board by adopting wood raw materials combing with an environment-friendly aldehyde-free adhesive, wherein the wood raw materials are pretreated by a bio-enzyme technology. The preparation process of the artificial board provided by the invention comprises the following steps of: pretreating the wood raw materials used for preparing the artificial board by the bio-enzyme technology; then sizing the treated wood raw materials by adopting the aldehyde-free adhesive; and then carrying out hot-pressing by adopting a two-section-type hot-pressing method, thereby obtaining the artificial board. The preparation method of the aldehyde-free artificial board provided by the invention has the advantages that through the pretreatment on the wood materials by bio-enzyme, the bonding strength of the artificial board is improved obviously, and the using requirements on the adhesive are lowered; formaldehyde-type adhesives are not added in the preparation process, the two-section-type hot-pressing treatment process is matched, the prepared artificial board does not emit free formaldehyde which is harmful to human bodies and the environment in the preparing and using processes, thus the preparation industry of the artificial board can break through the green barrier abroad and develop soundly.

Description

technical field [0001] The invention relates to a production method of an aldehyde-free wood-based panel, which 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] At present, formaldehyde series adhesives are the most widely used in the production of wood-based panels in our country. However, wood products glued with formaldehyde series adhesives will inevitably release formaldehyde and other harmful gases during production and use, polluting the environment and endangering human health. [0004] Recently, some progress has been made in the p...

Claims

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Application Information

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IPC IPC(8): B27N3/08B27K3/50B27K5/04
Inventor 顾正彪程力王鹏李兆丰洪雁
Owner JIANGNAN UNIV
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