Abstract

Alkyl glycidyl ether and 3-chloropropionic acid were grafted onto alkaline lignin (KL) to obtain lignin-based alcohol ether carboxylate surfactant (KLS) and its structure, surface tension, emulsifying ability and detergency of cotton fiber were investigated. Then, the alkaline lignin was pretreated by using ultrasound to activate the KL molecular. The pretreated KL showed lower M_n and narrow molecular weight distribution. The absorbance ratio of A₁₁₂₅/A₁₆₀₀ and A₁₀₄₇/A₁₆₀₀ of pretreated KL increased as the time of the ultrasound increased, indicating that new phenolic hydroxyl groups were formed. Further study revealed that the M_n, surface tension and emulsifying ability were significantly affected by the reaction temperature and ultrasound treatment. The sample (KLSU) obtained at 70 °C with ultrasound pretreatment had a good surface activity and emulsifying ability. The critical micelle concentration of KLSU was 3.1 g/L and the corresponding surface tension was 29.1 mN/m. The KLSU was used as a novel surfactant for detergent and exhibited significant detergency property. The effect of different types of surfactant on the detergency, zeta potential, surface tension and particle distribution of mixture solution containing KLSU were investigated. The KLSU solution mixed with sodium dodecyl benzene sulfonate showed good detergency, surface tension and stability. This article highlighted the potential usage of lignin-based alcohol ether carboxylate surfactant in detergent.

摘要

将烷基缩水甘油醚和3-氯丙酸接枝到碱性木质素(KL)上得到木质素基醇醚羧酸盐表面活性剂(KLS)，并对其结构、表面张力、乳化能力和对棉纤维的去污力进行了研究。然后，通过使用超声激活 KL 分子对碱性木质素进行预处理。预处理的 KL 表现出较低的 M _n和窄的分子量分布。_{预处理KL的A 1125} /A ₁₆₀₀和A ₁₀₄₇ /A ₁₆₀₀的吸光度比随着超声时间的增加而增加，表明形成了新的酚羟基。进一步的研究表明，M _n，表面张力和乳化能力受反应温度和超声处理的显着影响。在 70 °C 下超声预处理得到的样品 (KLSU) 具有良好的表面活性和乳化能力。KLSU的临界胶束浓度为3.1 g/L，相应的表面张力为29.1 mN/m。KLSU 被用作洗涤剂的新型表面活性剂，并表现出显着的去污性能。研究了不同类型的表面活性剂对含KLSU混合溶液的去污力、zeta电位、表面张力和颗粒分布的影响。与十二烷基苯磺酸钠混合的KLSU溶液表现出良好的去污力、表面张力和稳定性。本文重点介绍了木质素醇醚羧酸盐表面活性剂在洗涤剂中的潜在用途。