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Method for preparing highly-damp-proof thin type medium density fiberboard

A medium-density, fiberboard technology, applied in the field of preparation of high moisture-proof thin medium-density fiberboard, can solve the problems of limited use, poor moisture-proof performance of medium-density fiberboard, etc., and achieve the effects of moderate cost, improved water resistance, and simple production process

Active Publication Date: 2014-06-25
DONGYING ZHENGHE WOOD IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the problem of limited use of medium density fiberboard due to poor moisture-proof performance, and to provide a method for preparing high-moisture-proof thin medium-density fiberboard

Method used

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  • Method for preparing highly-damp-proof thin type medium density fiberboard
  • Method for preparing highly-damp-proof thin type medium density fiberboard

Examples

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Embodiment 1

[0025] Example 1: Using radiata pine and fresh poplar as raw materials (radiata pine: poplar = 3:1), pressed with a thickness of 2.77mm and a density of 760kg / m 3 High moisture-proof thin medium density fiberboard. The process steps are as follows: first mix the two raw materials, wash the chipped chips with water to remove the sediment, and then pass through a shaking sieve to obtain mixed wood chips with a length of 30mm, a width of 20mm and a thickness of 3mm. The wood chips are preliminarily softened by pre-cooking, and then pressure-cooked at 0.8MPa for 3 minutes. Then, they enter the thermal grinder for thermal grinding at a pressure of 0.6MPa, and at the same time, add molten paraffin that accounts for 3% of the dry fiber. Apply PMUF resin accounting for 12% of the dry fiber, and add a composite liquid curing agent of 1.5% of the resin mass when adjusting the glue (the mass ratio of the curing agent is P-MDI:ammonium sulfate=8:2), and the two are mixed by a static mixer...

Embodiment 2

[0027] Example 2: Using radiata pine and fresh poplar as raw materials (radiata pine: poplar = 3:1), pressed with a thickness of 5.70mm and a density of 780kg / m 3 High moisture-proof thin medium density fiberboard. The process steps are as follows: first mix the two raw materials, wash the chipped chips with water to remove sediment, and then obtain mixed wood chips with a length of 30 mm, a width of 20 mm and a thickness of 3 mm through a shaker sieve. The wood chips are preliminarily softened by pre-cooking, and then pressure-cooked at 0.7MPa for 3 minutes, and then put into a thermal grinder for thermal grinding at a pressure of 0.6MPa, and at the same time, melted paraffin wax accounting for 2% of the dry fiber is added. Apply PMUF resin accounting for 11.5% of the dry fiber, and add a composite liquid curing agent of 1% of the resin mass when adjusting the glue (the mass ratio of the curing agent is P-MDI:ammonium sulfate=9:1), and the two are mixed by a static mixer Aft...

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Abstract

A method for preparing a highly-damp-proof thin type medium density fiberboard includes the steps of firstly, mixing raw material Monterey pines with fresh poplars to obtain a mixed wood chip; secondly, conducting pre-cooking and cooking on the mixed wood chip, and adding paraffin in the molten state to conduct hot grinding and fiber decomposition; thirdly, adding phenol modified melamine urea resin and liquid composite curing agents to fiber where hot grinding is conducted; fourthly, drying the fiber where sizing is conducted, and adding powder waterproof agents in the drying process; fifthly, preparing the highly-damp-proof thin type medium density fiberboard by conducting continuous flat pressing on dried fiber after separation and mat formation are conduced. According to the method, the PMUF resin replaces traditional MUF resin for producing the highly-damp-proof thin type fiberboard, the resin cost is reduced by 10% to 15%, and the production cost for preparing the highly-damp-proof thin type medium density fiberboard through pressing is reduced by 180 yuan / m<3> to 220 yuan / m<3>. Isocyanate is introduced to serve as the curing agents of the PMUF resin, the molecular structure is improved after the resin is cured, and the waterproof performance of the fiberboard is improved.

Description

technical field [0001] The invention belongs to the field of functional wood-based composite materials, and in particular relates to a method for preparing a high-moisture-proof thin medium-density fiberboard mainly used in places with high moisture-proof requirements. Background technique [0002] Fibreboard is formed by hot pressing of wood fibers with adhesive, and the fibers are laid in the same direction to form a blank. It overcomes the anisotropy of wood, has excellent physical and chemical properties, and is easy to process. It has always been favored by people. With the advancement of science and technology, derivative series products and deep-processing varieties of fiberboard continue to appear and improve, and various functional fiberboards are gradually applied in various fields of the national economy. [0003] Fibreboard production is inseparable from adhesives. At present, urea-formaldehyde resin adhesives account for more than 90% of the total glue used in ...

Claims

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Application Information

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IPC IPC(8): B27N3/04B27N3/08C08G14/12
Inventor 纪良李英俊樊茂祥
Owner DONGYING ZHENGHE WOOD IND
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