摘要
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。
Alkali lignin is the main by-produce in pulp and papermaking industry, but it shows lower chemical reactivity because of its complex molecule structure, which limits the application of alkali lignin on polymers. According to alkali lignin characteristics of the paper states the two treatment methods of ultrasonic and laccase to activate alkali lignin to compare the activation effect of ultrasonic treatment time, laccase dosage, activating time and temperature on alkali lignin. And also states the feasibility of phenol substitution amount by using Laccase-activated alkali lignin for preparing phenolic （PF） resin. The results showed that lacease activation was more conducive to increase reactive groups of alkali lignin. The optimized laccase-activated process was the amount of laccase with 25U/g, activation time of 24h, and activation temperature of 45 ℃, PF resin with 50% of phenol substitution amount by using Laccase-Activated alkali lignin has better bonding strength, which meets the Chinese national standard GB / T 9846.3-2004.
出处
《木材加工机械》
2017年第2期23-26,22,共5页
Wood Processing Machinery
关键词
碱木质素
漆酶
超声波
酚醛树脂
alkali lignin
laccase
ultrasonic
phenolic resin.
