酶预处理针叶木硫酸盐碱木质素制备酚醛树脂胶黏剂的研究  

Preparation of phenolic resin adhesive from soft wood kraft lignin pretreated by enzyme

作　　者：刘宇旗 武书彬[1] 庄军平[1] 刘颖[1] 魏文光[2] 张凤山[2] LIU Yu-qi;WU Shu-bin;ZHUANG Jun-ping;LIU Ying;WEI Wen-guang;ZHANG Feng-shan(State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510601,China;Shandong Huatai Paper Co.,Ltd.,Dongying 257335,China)

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510601 [2]山东华泰纸业股份有限公司,山东东营257335

出　　处：《应用化工》2023年第8期2342-2345,2352,共5页Applied Chemical Industry

基　　金：山东省重点研发计划项目(2019JZZY010501)。

摘　　要：研究了纤维素酶预处理针叶木硫酸盐碱木质素(KPL),有效脱除其中的糖分,以提升其替代苯酚制备木质素基酚醛树脂胶黏剂(LPF)的性能。通过单因素实验,优化了酶解预处理过程的工艺参数,并以纤维素酶预处理的木质素60%替代苯酚与甲醛反应制备酶预处理木质素基酚醛树脂胶黏剂(EHLPF),通过FTIR、TG对胶黏剂的结构及热稳定性进行表征。结果表明,优化后的纤维素酶预处理条件为:酶用量4 FPU/g,反应时间48 h,料液比1∶24,以超纯水作为缓冲体系。结果表明纤维素酶对制浆黑液中的多糖去除效果显著,总糖含量降低至2.46%,总糖去除率可达63.00%,木质素纯度达86.26%。纤维素酶预处理后木质素制备的EHLPF胶黏剂干、湿态胶合强度可达1.95,1.86 MPa,与酶预处理前的对照样相比分别提高了83.96%和124.10%。同时,较低的总糖含量的粗木质素所制备的胶黏剂表现出更好的热稳定性。Cellulase pretreatment of soft woodkraft lignin(KPL) was studied to effectively remove the sugar and improve the performance of lignin-based phenolic resin adhesive(LPF) prepared by it instead of phenol.By single factor test,the process parameters of enzymatic pretreatment were optimized,and the enzymatic pretreatment lignin based phenolic resin adhesive(EHLPF) was prepared by reaction of cellulase pretreatment lignin 60% instead of phenol and formaldehyde.The structure and thermal stability of the adhesive were characterized by FTIR and TG.The results showed that the optimized cellulase pretreatment conditions were as follows:the enzyme dosage was 4 FPU/g,the reaction time was 48 h,the ratio of solid to liquid was 1∶24,and the buffer solution was replaced by ultrapure water.The results showed that cellulase significantly removed suger from pulping black liquor,the total sugar content decreased to 2.46%,the total sugar removal rate reached 63.00%,and the lignin purity reached 86.26%.The dry and wet bonding strength of EHLPF adhesive prepared by cellulase pretreatment could reach 1.95,1.86 MPa,which were increased by 83.96% and 124.10%,respectively.At the same time,the adhesives prepared by lignin with lower total sugar content showed better thermal stability.

关 键 词：制浆黑液 酚醛树脂 木材胶黏剂 胶合强度 

分 类 号：TQ430.4[化学工程]