松香酯O-烷基化改性增强木质素胺表面活性

A Novel Lignin-amine Surfactant Reinforced by Rosin ester via O-alkylation Reaction

摘要:

摘要:以碱木质素为原料，通过与二乙烯三胺和甲醛的Mannich反应得到了木质素胺，再通过和松香与环氧氯丙烷 的酯化产物（3-松香酰氧-2-羟丙基氯，简称为松香酯）的O-烷基化反应引入亲油性的松香酯基团，合成了松香改性木质素胺表面活性剂，并通过红外、紫外、表面张力仪对目标产物结构和性能进行了表征和测定 。结果表明,合成松香酯的适宜条件为n（松香）：n(环氧氯丙烷)=1:1.5、反应温度100℃、反应时间6h。在此条件下，松香的酯化率为95.6%。按投料比n(木质素胺) :n(松香酯) = 4:1合成的目标产物在pH=2的稀盐酸溶液中，当其质量浓度为10g/L时，表面张力为33.2 mN/m，甲苯乳液分层时间为74min,而同样条件下木质素胺的表面张力为48.5 mN/m，甲苯乳液分层时间为43min，引入松香酯基团可以增强木质素胺表面物化性能。

Abstract:

Abstract: A novel surfactant was prepared from lignin-amine modified by rosin ester, which was synthesized from rosin and epichlorohydrin. The surfactant was characterized by IR 、UV and the automatic surface tensiometer, and its physico-chemical properties were also measured. The introduction of abietyl groups as hydrophobic groups in lignin-amine, by O-alkylation reaction, enhanced the performance of the surfactant. The experiment results showed that the synthesis conditions for rosin ester were optimized as follows: the molar ratio of rosin to epichlorohydrin was 1: 1.5, reaction temperature was 100℃, reaction time was 6h. Under these conditions, the conversion rate of rosin was up to 95.6%. When the molar ratio of lignin-amine to rosin ester was 4, the surface tension of the surfactant reached 33.2 mN/m at a concentration of 10 g/L hydrochloric acid aqueous solution with a pH 2.0. The emulsifiability of the surfactant was 74 min. In contrast, the surface tension of lignin-amine at the same condition was 48.5 mN/m, and it’s emulsifiability was 43 min. As expected, the performance of the surfactant was improved by abietyl groups.