论文部分内容阅读
碱木质素是制浆造纸工业的主要副产品,但是碱木质素复杂的分子结构决定了其化学反应活性并不高,从而影响其在高分子材料上的应用。笔者根据碱木质素的特点分别采用超声波和漆酶处理方法活化碱木质素,对比研究超声波处理时间与漆酶用量、活化时间、活化温度等工艺条件对碱木质素的活化效果,并探讨用活化的碱木质素替代部分苯酚制备酚醛(PF)树脂的可行性。研究结果表明:漆酶活化较超声波处理更利于提高碱木质素结构中反应活性点;漆酶活化的最佳工艺为漆酶用量25U/g,活化时间24h,活化温度45℃;漆酶活化木质素可以替代50%的苯酚用量制备PF树脂,其耐水胶合强度能满足国家标准GB/T 9846.3-2004中Ⅰ类板材要求。
Alkaline lignin is the major by-product of the pulp and paper industry, but the complex molecular structure of alkali lignin determines its chemical reactivity is not high, thus affecting its application in polymer materials. According to the characteristics of alkali lignin, the authors used ultrasonic and laccase treatment methods to activate alkali lignin, and compared the effects of ultrasonic treatment time and laccase dosage, activation time and activation temperature on the activation of alkali lignin, Alkali lignin to replace part of phenol to make phenolic (PF) resin feasibility. The results showed that laccase activation was more effective in raising the reactive sites in the alkaline lignin structure. The optimum conditions of laccase activation were laccase dosage 25U / g, activation time 24h, activation temperature 45 ℃; laccase-activated wood PF can replace 50% of the amount of phenol prepared PF resin, the water-resistant adhesive strength to meet the national standard GB / T 9846.3-2004 Class I plate requirements.