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以碱木质素(AL)为原料,通过催化液化处理提取木质素酚类产物(LAL),利用催化液化产物富含的酚羟基与环氧氯丙烷(ECH)在碱性条件下反应生成水不溶的木质素醚类中间体,该中间体的环氧基可与乙二醇或者聚乙二醇PEG顶端的羟基发生缩合反应,生成木质素聚醚的非离子表面活性剂(NLAL)。利用红外光谱分析仪、紫外分光光度计等对LAL的性能进行分析,发现与AL相比,LAL酚羟基含量增加,分子量降低,大大提升了反应活性,有利于下一步改性反应的进行。采用红外光谱分析仪、表面张力测定仪、泡沫分析仪等对NLAL各方面性能进行表征。结果表明:NLAL对应临界胶束浓度的表面张力即最低表面张力为37.71m N/m,具有非常好的水溶性和润湿性能,属于低泡类的表面活性剂,做乳化剂可形成O/W型乳液,乳化性能较为优良。
Using alkaline lignin (AL) as raw material, the lignin phenolic product (LAL) is extracted by catalytic liquefaction, and the phenolic hydroxyl enriched in the catalytic liquefaction product reacts with epichlorohydrin (ECH) under alkaline conditions to form water-insoluble Of the lignin ether intermediates, the epoxy intermediate with ethylene glycol or polyethylene glycol PEG at the top of the hydroxyl condensation reaction to produce lignin polyether nonionic surfactant (NLAL). The performance of LAL was analyzed by infrared spectrum analyzer and UV spectrophotometer. It was found that the content of LAL phenolic hydroxyl group increased compared with AL, the molecular weight decreased, the reaction activity was greatly improved, which was propitious to the next modification reaction. The performance of NLAL was characterized by infrared spectrum analyzer, surface tension tester and foam analyzer. The results showed that the surface tension of NLAL corresponding to the critical micelle concentration of 37.71m N / m, which has very good water solubility and wetting properties, belongs to the class of surfactants of low foams. The emulsifier can form O / W-type emulsion, emulsifying performance is relatively good.