木质素两性表面活性剂的合成及表面物化性能

Synthesis of lignin amphoteric surfactant and measurements of their physic-chemical properties

摘要:

摘要：以十二烷基二甲基叔胺、环氧氯丙烷为原料，合成了中间体-DMAC〔(2，3-环氧丙基)十二烷基二甲基氯化铵〕，再与磺化木质素SL酚羟基反应，合成了木质素两性表面活性剂LAS。通过正交实验确定了最佳合成条件：以丙酮为溶剂，n(SL)：n(DMAC)=1：1.1，反应时间3h，pH为12，反应温度为55℃，产物含氮质量分数达2.25%。通过元素分析、傅立叶变换红外光谱、UV，确证了目的产物结构。测定产物的临界胶束质量浓度CMC为3g/L，γCMC为21.11mN/m，HLB值为10。表明所合成的木质素两性表面活性剂具有较高的表面活性。

Abstract:

Abstract: (2, 3-epoxypropyl) dimethyl-ammonium chloride (DMAC) was synthesized with N, N -dimethyl dodecylamine and epichlorohy as raw material in this article Secondly. The LAS was prepared by the DMAC with SL. Through the orthogonal experiment, the optimal preparation condition was investigated: using acetone as the solvent, n (SL)：n (DMAC) was 1：1.1, reaction time was 3h, reaction temperature 55℃, pH value was 12. The nitrogen content of LAS reached 2.25%. The structure of the production was characterized by FT-IR spectrum, UV and elementary analysis. The surface activities of the product were measured: critical micelle concentration (CMC) 3g/L, their surface tension was 21.11mN/m, HLB was 10. The results showed that LAS exhibited a higher surface activity. Key words: Lignin; amphoteric surfactant; physic-chemical property