Brittleness inhibition method of chemical function improved wood

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, ...

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) the participation of acid (as a catalyst) or the generation of organic acids (reaction by-products) during the reaction process, resulting in the main components of wood cell walls, especially cellulose , catalyzed hydrolysis; (2) Due to the cross-linking reaction or graft filling of chemical reagents in the wood cell wall, the slip between the cell wall microfibril molecular chains of the modified wood is limited under load, and macroscopically The wood shows a decrease in toughness, and the wood is brittle

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