离子液体提取木质素及环氧树脂的合成

采用离子液体提取尾叶桉木木质素,以甲苯酚为酚化剂,浓硫酸为催化剂,对木质素进行酚化改性,再以NaOH为催化剂,将酚化木质素与环氧氯丙烷进行环氧化反应,合成木质素基环氧树脂。实验表明:当离子液体为ChCl]Gly]、温度为90℃、时间为12 h、液固比为20∶1时,木质素的提取率达到93.73%,再生木质素纯度为96.3%;酚化木质素与环氧氯丙烷质量比为1∶2.5,NaOH质量分数为酚化木质素质量的20%,反应时间为3 h,反应温度为95℃,在此条件下,木质素环氧树脂的环氧值为0.364。

IONIC LIQUID EXTRACTED OF LIGNIN AND SYNTHESIS OF EPOXY RESIN

In this study,lignin from eucalyptus was extracted with ionic liquid,and Lignin was phenol modified by cresol as phenolic agent with concentrated sulfuric acid as catalyst,then with NaOH as catalyst,lignin-based epoxy resin was synthesized via the epoxidation reaction between the phenol lignin and epoxy chloropropane. The result shows that the lignin extraction rate are 93.73% and the purity of regenerated lignin was 96.3% under the optimum conditions which areChCl]Gly]ionic liquid as the extractant,treatment temperature of 90 ℃,reaction time of 12 h and liquid-solid ration of 20∶1(g/g). The optimal conditions for the synthesis of lignin-based epoxy resin were determined as follows:mass ratio of phenol lignin to epoxy chloropropane was 1∶2.5(g/g),20% NaOH with the reaction temperature was 95 ℃ and the reaction time was 3 h. The maximum epoxy value of lignin-based epoxy resin reached0.364 under these optimized conditions.