摘要
本研究以蔗渣硫酸盐木素(KL)为原料,在酸性条件下对KL进行酚化改性,通过单因素实验和正交实验优化反应条件。以酚化改性硫酸盐木素(P-KL)酚羟基含量为响应值,确定最佳反应条件为:苯酚∶木素(质量比)=4∶1,催化剂(质量分数98%浓硫酸)用量4%,反应时间2. 5 h,反应温度110℃。利用凝胶渗透色谱(GPC)表征硫酸盐木素酚化改性前后相对分子质量的变化,结果表明,与KL相比,P-KL相对分子质量减小、分布变窄,酚羟基含量增加。分别用P-KL和KL代替质量分数60%的苯酚制取木素基酚醛树脂胶黏剂P-KLPF和KLPF。结果表明,P-KLPF中游离甲醛和游离酚含量均小于KLPF胶黏剂。由此可知,酚化改性能显著提高硫酸盐木素与甲醛的反应活性,降低木素基酚醛树脂胶黏剂中游离甲醛及苯酚的释放量。
In this study,sugarcane bagasse kraft lignin(KL)was phenolated by using acid as a catalyst.The phenolation process was optimized by single-factor and orthogonal experimental design where the phenolic hydroxyl group content of lignin was used as response value.The optimal conditions were found as follows:phenol∶KL=4∶1(mass ratio),t=2.5 h,T=110℃,the catalyst dosage(concentrated sulphuric acid of 98 wt%)was 4%.The structural changes of KL induced by phenolation were further characterized by 31 P Nuclear Magnetic Resonance Spectroscopy(31 P NMR),and Fourier Transform infrared spectroscopy.The results indicated that the molecular weight and the polydispersity of phenolated bagasse kraft lignin(PKL)decreased.The phenolic hydroxyl group content increased.Eventually,P-KL and KL were respectively used to replace 60 wt%of phenol to produce phenolic formaldehyde(PF)adhesives as P-KLPF and KLPF.Compared to KLPF,less formaldehyde and phenol were released from P-KLPF which indicated that phenolation was an effective way to improve the reaction activity bagasse kraft lignin lignin and formaldehyde.
作者
贾转
万广聪
张清桐
李明富
罗斌
郭晨艳
王双飞
闵斗勇
JIA Zhuan;WAN Guang-cong;ZHANG Qing-tong;LI Ming-fu;LUO Bin;GUO Chen-yan;WANG Shuang-fei;MIN Dou-yong(College of Light Industry and Food Engineering,Guangxi University,Nanning,Guangxi Zhuang Autonomous Region,530004;Guangxi Key Lab of Clean Pulp&Papermaking and Pollution Control,Nanning,Guangxi Zhuang Autonomous Region,530004)
出处
《中国造纸》
CAS
北大核心
2018年第9期1-8,共8页
China Pulp & Paper
基金
中国博士后基金(2015M570419)
华南理工大学制浆造纸工程国家重点实验室开放基金(201516)
关键词
蔗渣硫酸盐木素
酚化改性
木素基酚醛树脂胶黏剂
sugarcane bagasse kraft lignin
phenolation
lignin-based phenolic formaldehyde adhesive
作者简介
贾转先生,在读硕士研究生;主要从事制浆黑液木素高值化利用研究;通信作者:闵斗勇,博士生导师;主要从事木质纤维原料全组分高值化利用基础研究。
