文献类型：期刊文献

中文题名：木质素环氧化接枝物及其制备大豆蛋白胶黏剂研究

英文题名：Synthesis of Epoxy Graft Copolymer of Lignin and Its Application inPreparing Soy Protein-based Adhesives

作者：陈欢[1] 汪宗涛[1] 陈仕清[1] 范东斌[1]

第一作者：陈欢

机构：[1]中国林业科学研究院木材工业研究所,北京100091

年份：2021

卷号：35

期号：20

起止页码：20190-20194

中文期刊名：材料导报

外文期刊名：Materials Reports

收录：CSTPCD;;EI(收录号：20215111366264);Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：浙江省与中国林业科学研究院省院合作项目(2018SY02)。

语种：中文

中文关键词：酶解木质素;大豆蛋白胶黏剂;脱甲基;环氧接枝物;胶合强度

外文关键词：enzymatic hydrolysis lignin;soy-based adhesives;demethylation;epoxy graft polymer;bonding strength

分类号：TQ432

摘要：通过脱甲基化改性提高酶解木质素酚羟基含量,以增加其环氧化反应活性,并于碱性条件下与乙二醇二缩水甘油醚(EGDE)反应合成木质素环氧接枝物(EPDL);将其作为交联剂与大豆蛋白复合制备高性能绿色大豆蛋白胶黏剂。采用核磁共振磷谱(^(31)P-NMR)以及红外光谱(FTIR)等分析手段对脱甲基木质素(DL)及其EPDL进行分析表征,研究了木质素脱甲基化前后羟基含量、接枝物环氧值及其化学结构的变化规律,考察了EPDL对大豆蛋白胶黏剂耐水胶合性能的影响。结果表明:脱甲基化改性明显提高了木质素羟基含量,其羟基含量较原木质素(L)提高了近29%,且通过微波加热处理可有效缩短木质素脱甲基化时间;脱甲基化改性使EPDL接枝上了较多环氧基团,其环氧值达到0.350 mol/100 g,增加了与大豆蛋白分子的交联反应活性;EPDL通过与大豆蛋白分子上羟基、氨基发生交联反应形成耐水化学结构,提高了大豆蛋白胶黏剂的耐热性和胶合性能,当EPDL用量为7%时,大豆蛋白胶黏剂湿胶合强度高达1.14 MPa,满足GB/T9846-2015国家标准规定的Ⅱ类胶合板要求。
In this work,enzymatic lignin was demethylated to improve its hydroxyl content,so as to increase the degree of epoxidation of lignin and ethy-lene glycol diglycidyl ether.The epoxy graft polymer of lignin(EPDL)with high epoxy value was synthesized by the reaction of lignin with ethy-lene glycol diglycidyl ether(EGDE)in alkaline condition,and which was used as a crosslinking agent to prepare high-performance green soy protein-based adhesive.Demethylated lignin(DL)and EPDL were characterized by^(31)P-NMR and FTIR.Hydroxyl content of lignin before and after demethylation,epoxy value and chemical structure of epoxy graft copolymer were discussed.The effect of soybean protein adhesives modified by EPDL on the wet bonding strength was investigated.The results showed that the content of hydroxyl group in lignin was increased by demethylation.Microwave heating significantly shortened the demethylation time of lignin and increased the hydroxyl content by 29%compared with the original lignin(L).More epoxy groups were grafted onto lignin and the epoxy value reached 0.350 mol/100 g by demethylation,which increased the cross-linking reaction activity between EPDL and SPI molecule.The water-resistant chemical structure could be formed by the crosslinking reaction of EPDL with hydroxyl group and amino group of soybean protein,which could improve the heat resistance and bonding strength of soy protein-based adhesive.When the amount of EPDL was 7%,the wet bonding strength of EPDL-SPI adhesive reached to the maximum value of 1.14 MPa,that far outstrips the requirements of classⅡplywood specified in GB/T9846-2015 national standard.