Research Status and Prospect of Organic-Inorganic Compound Modified Fast-growing Wood
SUN Zhenyu1, ZHANG Yuan1, ZUO Yingfeng1, WU Yiqiang1, WANG Zhangheng1, LYU Jianxiong1,2
1 College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China 2 Research Institute of Wood Industry, Chinese Academy of Forest, Beijing 100091, China
Abstract: Wood as a natural renewable resource is widely used in various fields. In recent years, with the increasing demand for wood and the shortage of natural forest resources, fast-growing wood as a substitute for hard wood has attracted more and more attention. However, due to its shortcomings such as low density, loose texture and poor mechanical properties, which is difficult to be used in high value-added products, so it needs to be modified and reinforce to increase the basic performance. Based on the large number of pores and active functional groups of fast-growing wood, the impregnation modification can not only improve the density and mechanical strength, but also add the new functions, so as to enhance the use value. According to the difference of impregnating liquid, traditional impregnation can be divided into organic and inorganic methods, but both of them have some shortcomings. The organic resin used in organic modified liquid impregnation can occur a cross-linking with the active functional groups of wood to form a compact structure, but most of the organic resin contains volatile toxic substances such as free formaldehyde, which will cause harm to the environment and human health. Although inorganic modifier is non-toxic and environment-friendly, most of them are difficult to form a stable structure in the wood, easy to occur the phenomenon of loss and moisture absorption, which affects the use function. Organic-inorganic composite modification is a new material composite technology, which combines the advantages of organic and inorganic materials. While reducing the amount of organic resin, the covering action (or bonding) of the organic resin was used to fix the inorganic modifier to reduce the loss. In addition, the organic resin can form a stable bond with the wood. Therefore, under the synergetic effects of organic and inorganic materials, the properties of the modified wood can be greatly improved, and the practical value and application fields can be expanded. In this paper, the research status of organic-inorganic compound modification fast-growing wood is taken as the theme, and the inorganic components such as silicon, boron, copper, calcium and montmorillonite are used as the main line, the research progress is described in detail, and the modification mechanism is also summarized. Meanwhile, the development trend is put forward from the aspects of basic theories, preparation technologies, basic properties and economic costs, and the aim is to promote the application of organic-inorganic compound ways in the modification of fast-growing wood.
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