高温高压酸性条件下DHP的自缩合及其与植物纤维的聚合反应

传统的人造板生产过程中由于采用含甲醛（如脲醛树脂、酚醛树脂、三聚氰胺-甲醛树脂）胶黏剂而引起甲醛污染。近年来人们开发了生物质胶黏剂，但是，生物质胶黏剂也存在甲醛污染或者胶合性能不理想等问题。本项目模拟植物体内木素、纤维素和半纤维素的交联方式，在漆酶/β-葡萄糖苷酶/O2构成的木素氧化酶体系作用下，木素前驱物松柏醇葡萄糖苷发生脱氢聚合反应，在植物纤维表面沉积出脱氢聚合物DHP，然后以表面沉积DHP的纤维为原料，利用DHP中侧链富含共轭双键易产生碳正离子并易发生自缩合的特性，实现DHP在人造板制备过程中的高温高压及酸性成型条件下的高效自缩合以及与植物纤维三大组分的聚合，使DHP与植物纤维间形成包覆互穿和共价键交联，有效提高纤维之间的结合强度，从而制备出具有高强度和高抗水性的人造板，彻底解决人造板中的甲醛污染问题，同时，为人工合成DHP增强纤维间结合强度提供新方法、新理论。

Formaldehyde pollution will occur when the formaldehyde-containing adhesives such as melamine-formaldehyde, urea-formaldehyde and phenol-formaldehyde are applied in the manufacture of conventional wood-based panel. Recently, bio-based adhesives have been developed. However, the bio-based adhesives also cause formaldehyde pollution or have low bonding property. In this work, crosslinking of cellulose, hemicellusoe and lignin in plant will be simulated. DHP (Dehydrogenation Polymer, DHP) was formed on the surface of fibers by the dehydrogenative polymerization reaction of coniferin in the presence of a mixture containing laccase, β-glucosidase, O2. Because of the abundant of conjugated double bonds at the side chain of DHP, cationic carbon is easy to be formed and lead to self-condensation of DHP. Then, wood-based panel with excellent strength and water resistance properties will be prepared with plant fibers through efficient self-condensation reaction of DHP and polymerization between DHP and three major components of plant fiber under high temperature and pressure in acidic condition. The problem of formaldehyde pollution from wood-based panel will be completely resolved. This research will provide a new method and a new theory for artificial DHP in the application of the improvement of inter fiber bonding strength.