一种新型酚化木质素胺乳化剂的合成及其性能

Preparation and Evaluation of a Novel Phenolated Lignin Derivative as a Cationic Emulsifier

以苯酚改性硫酸盐木质素得到了酚化木质素,再将其与脱氢枞酸单乙二酰胺、甲醛进行Mannich反应以引入脱氢枞酸单乙二酰胺甲基亲油基团,然后将反应产物进一步与二乙烯三胺、甲醛反应引入了二乙烯三胺甲基亲水基团,合成了一种新型酚化木质素阳离子乳化剂。实验表明,在碱性条件下,当n(苯酚):n(木质素)=1:1、反应温度100℃、反应时间1.5 h时,所得产物酚化木质素的酚羟基含量较木质素增加了30.3%,相当于每个C_9单元接枝了0.30个苯酚分子,质均分子质量增大7%,多分散性由1.49降至1.29;与木质素相比,酚化木质素中引入的脱氢枞酸单乙二酰胺甲基数量增加了1.1倍,引入的二乙烯三胺甲基数量增加了0.42倍;在pH值为2的稀盐酸溶液中,所合成的脱氢枞酸单乙二酰胺/二乙烯三胺/甲醛改性酚化木质素阳离子乳化剂的最大Zeta电位为38.0 mV,质量浓度为10 g/L时,表面张力为35.0 mN/m,甲苯乳液油水分层时间为70 min,均优于用未经酚化改性的木质素合成的产物。

A novel lignin derivative（ADRA-DETA-F-PKL）,in which phenol,dehydroabietyl groups and diethylenetriamine groups were introduced into the kraft lignin sequentially in order to prepare a cationic emulsifier with improved performance.The experiments showed that under alkaline conditions the content of phenolic hydroxyl groups in phenolated lignin increased by 30.3%when the mole ratio of phenol to lignin was 1：1,the reaction temperature was 100℃ and reaction time was 1.5 hour,0.30 mole phenol molecules were correspondingly introduced into lignin per C_9 unit.The weight-average molecular weight of phenolated lignin increased by 7%,molecular weight distribution index decreased from 1.49 to 1.29.Compared with lignin,the number of dehydroabietyl groups in phenolated lignin increased by 1.1 times and diethylenetriamine groups 0.42 times.The surface tension value of the product ADRA-DETA-F-KL was 35.0 mN/m at the concentration of10 g/L in dilute hydrochloric acid solution with pH value of 2,its Zeta potential was as high as 38.0 mV,and its emulsifiability was 70 min.