Modification technology capable of improving strength and tenacity of wood

Abstract

The invention relates to the technical field of wood modification, in particular to a modification technology capable of improving strength and tenacity of wood. The modification technology comprises the following steps: A. preparation of impregnation liquid which is prepared from the following raw materials in parts by weight: 10-30 parts of melamine modified urea resin, 6-10 parts of dextrin, 1-5 parts of a nanometer modifying agent, 1-3 parts of a flexibilizer, 1-5 parts of auxiliaries and 60-100 parts of water, weighing the raw materials according to the weight proportion and uniformly mixing to obtain the impregnation liquid; B. impregnating: performing vacuum-pressure impregnation treatment on the wood, and enabling the wood to adsorb the impregnation liquid; C. drying: drying the impregnated wood; D. thermal treatment: conducting thermal treatment on the dried wood under a vacuum state. The modification technology disclosed by the invention can obviously improve the strength and the tenacity of the wood, is simple in steps, convenient to operate and control, stable in quality, high in production efficiency and capable of realizing large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of wood modification, in particular to a modification process for improving wood strength and toughness. Background technique [0002] With the development of the country's economic construction and the improvement of people's living standards, people's demand for wood is increasing. The implementation of natural forest protection projects has made the contradiction between supply and demand of timber more prominent. In order to alleviate the contradiction between supply and demand, my country has built a large area of ​​industrial plantation. Although the artificial forest wood has the advantages of fast growth and high yield, the physical and mechanical properties of the artificial fast-growing forest wood are poor, the density is low, the material is soft, and it is easy to shrink and deform. [0003] In order to expand the application range of artificial forest timber and improve the economic value of ...

AI Technical Summary

Problems solved by technology

But the disadvantage is that the oil will soak into the wood and increase the weight of the wood by 50% to 70%, and the heat-treated wood has a smell of oily smoke

[0013] The above four heat treatment processes are complicated, the process conditions are harsh, the control is difficult, and the stability of product quality is difficult to guarantee. Some treatment processes also require special heat treatment media. For example, the French Rectification process requires nitrogen, and the German OHT treatment process requires oil. as a heat treatment medium

[0014] Although the dimensional stability of the wood can be improved after heat treatment modification, the equilibrium moisture content in the wood decreases, the corrosion resistance also increases, the cementation performance improves, the wood color becomes darker, and the appearance of the wood with poor appearance is improved. However, heat treatment The physical and mechanical properties of the finished wood decrease, and the wood strength value drops greatly, such as: the bending strength decreases, the surface wettability decreases, etc., and the toughness of the existing modified wood is poor, which greatly limits the carbonized wood. Application range