Brittleness inhibition method of chemical function improved wood

A chemical modification, wood technology, applied in the direction of impregnated wood, wood impregnation, wood processing utensils, etc., can solve the problems of wood bending strength, tensile strength and impact strength reduction, toughness decline, melamine becomes brittle, etc., to reach the size Effects of improved stability, improved impact strength, and increased overall density

Inactive Publication Date: 2012-01-18
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Melamine resin is easy to age, and the curing time is short. During use, the methylene group will be hydrolyzed, causing the melamine itself to become brittle, and the treated wood also has embrittlement problems.
2D resin will release some formaldehyde during the process of processing wood, and the bending strength, tensile strength and impact strength of the treated wood will be reduced
The main reasons for the reduction of the mechanical properties of these chemically modified wood can be attributed to: (1)

Method used

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  • Brittleness inhibition method of chemical function improved wood
  • Brittleness inhibition method of chemical function improved wood
  • Brittleness inhibition method of chemical function improved wood

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specific Embodiment approach

[0018] The technical solutions of the present invention are not limited to the specific embodiments exemplified below, but also include specific combinations among the specific embodiments.

[0019] Basic implementation method: use polyhydric alcohol compounds as toughening aids, natural organic acids as catalysts, and low-molecular-weight methylol resins as modifiers to compound as functional improvement reagents to treat wood or wood substrates, inhibiting chemical modification and causing wood brittleness. The basic method is as follows:

[0020]One, the formula of modifying agent: choose a polyhydric alcohol compound at least, and select a kind of methylol compound at least, the mol ratio of two kinds of compounds (polyhydric alcohol: methylol compound) is 0.2~3: 1, Add deionized water to make a solution with a mass fraction of 5-50%, and add a certain amount of functional catalyst, such as citric acid, magnesium chloride or zinc chloride, according to 0.1-5% of the soluti...

specific Embodiment approach 1

[0023] Specific implementation mode one: the selection of modified materials. The modification objects selected in this embodiment can be: wood of various quality grades and various wood substrates such as medium density fiberboard, particle board or plywood.

specific Embodiment approach 2

[0024] Specific embodiment two: the selection of polyhydric alcohol compound. According to the first part of the basic implementation method, the difference of this embodiment is that the selection of polyhydric alcohols in this embodiment, the polyhydric alcohol compounds that can be further selected are ethylene glycol, polyethylene glycol, 1,2-propanediol, 1 , 3-propanediol, butanediol, 1,2-pentanediol, 1,2-hexanediol, glycerin, sorbitol, 1,4-butanediol, 1,6-hexanediol, 1,12- One or more combinations of dodecanol, diethylene glycol, triethylene glycol, tetraethylene glycol, dipropylene glycol, tripropylene glycol, tetrapropylene glycol, diglycerol, and triglycerol. The polyhydric alcohol used has 2-18 carbon atoms, is soluble in water, and has a boiling point above 130°C.

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Abstract

The invention is a brittleness inhibition method of chemical function improved wood, and relates to a new method for wood function improvement. By toughening treatment, the negative influence of wood brittleness increase caused by modifying wood only by modified resin is reduced. The method particularly comprises the following steps of: first, preparation of a modifier; second, soaking of wood or wood base materials; third, reaction polymerization of a functional reagent om the wood or wood base materials. The used organic acid catalyst has excellent environmental protection performance, can react with hydroxyls in the modifier system and the wood so as to be fixed in the wood, has good leaching resistance, and has no environmental harm. Functionalized wood prepared by the technology of the invention has significantly improved impact strength. The impact strength of functionalized wood without toughening treatment is reduced by 75%, and the impact strength of functionalized wood with toughening treatment is reduced only by 35%. Meanwhile, the toughening treatment does not reduce other performance of the functionalized wood; the dimension stability is obviously improved; and the antiswelling efficient is up to 50-70%.

Description

technical field [0001] The invention relates to a new method for improving wood function. Using polyhydric alcohol compounds as toughening aids, natural organic acids as catalysts, and low-molecular methylol resins as modifiers compounded as functional improvement agents to treat wood or wood substrates to inhibit wood embrittlement caused by chemical modification. Background technique [0002] Wood is a natural renewable and recycled material. With the development of national economic construction and the improvement of people's living standards, people's demand for wood is increasing. However, the implementation of natural forest protection projects and the relatively small coverage of natural forests in China have resulted in a sharp drop in timber supply. In order to alleviate the contradiction between timber supply and demand, my country has built a large area of ​​industrial plantation. Although the artificial forest has the advantages of fast growth and high yield, ...

Claims

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Application Information

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IPC IPC(8): B27K3/50B27K3/08
Inventor 谢延军符启良王清文王海刚江涛冯鑫浩
Owner NORTHEAST FORESTRY UNIVERSITY
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