摘要
以不同来源的工业木质素为原料,经过磺甲基化与交联改性制备染料分散剂。对改性前后木质素的结构及分散剂的分散性能及高温稳定性进行表征,通过关联木质素的分子结构特征与分散剂应用性能,解析木质素分子结构对其改性后作为染料分散剂性质及性能的影响规律。结果表明:针叶材木质素磺甲基化反应活性高于禾本科及阔叶材;磺甲基化木质素分子交联能力由其酚羟基含量、相对分子质量及木质素单元结构共同决定;阔叶材木质素磺甲基化后作为染料分散剂更易对涤纶纤维造成沾污。添加改性阔叶材硫酸盐木质素SHL和改性针叶材硫酸盐木质素SSL的染液的高温(130℃)粒径分别为0.927和4.364μm,上染率分别为88.49%和87.72%,硫酸盐木质素基分散剂在高温分散稳定性与上染率方面综合表现更优。
Dye dispersants were prepared via sulfonation-methylation and cross-linking modification of industrial lignin from different sources.The structure of lignin before and after modification and the dispersion performance and high temperature stability of dispersant were characterized.By associating the molecular structure features of lignin with the application performance of dispersants,the influence of lignin molecular structure on the properties and properties of modified lignin as dye dispersants was analyzed.The results showed that the lignin sulfomethylation reactivity of softwood was higher than that of gramineous and hardwood.The molecular crosslinking capacity of sulfomethylated lignin was determined by its phenolic hydroxyl content,relative molecular weight and lignin unit structure.As a dye dispersant,it was easier to stain polyester fibers after lignosulfonate methylation of hardwood.The high temperature(130℃)particle sizes of the dye solution added modified sulfate lignin in hardwood and softwood were 0.927 and 4.364μm,respectively,with dye uptake rates of 88.49%and 87.72%,respectively.Sulfate lignin-based dispersants had better comprehensive performance in both high temperature dispersion stability and dyeing uptake rate.
作者
田园园
刘正宇
王斌
杨昇
袁同琦
TIAN Yuanyuan;LIU Zhengyu;WANG Bin;YANG Sheng;YUAN Tongqi(State Key Laboratory of Efficient Production of Forest Resources,Beijing Forestry University,Beijing 100083,China;Beijing Key Laboratory of Lignocellulosic Chemistry,Beijing Forestry University,Beijing 100083,China)
出处
《生物质化学工程》
2025年第5期1-10,共10页
Biomass Chemical Engineering
基金
北京林业大学科研创新团队项目(BLRC2023B05)。
关键词
工业木质素
分子结构
磺甲基化
构效关系
industrial lignin
molecular structure
sulfomethylation
structure-activity relationship
