将木质素磺酸钠（SLS）在氢溴酸作用下酚化改性使甲氧基转化为酚羟基，提高其反应活性并保留磺酸盐基团，并于碱性条件下加入环氧氯丙烷制得木质素基环氧树脂（LBER）；将其作为交联改性剂添加至水性聚氨酯预聚体中，并成功制备出木质素基环氧树脂-水性聚氨酯乳液（LBER-WPU）。研究了LBER用量对分散液及胶膜性能的影响。结果表明，当LBER质量分数为3%~4%时，分散液外观良好、粒径较小，具备6个月及以上储存期；胶膜拉伸强度最高可达22MPa，较未改性水性聚氨酯（WPU-0）提高了约2倍，胶膜耐水性增强，热稳定性有明显改善。

Sodium lignosulfonate (SLS) is phenolated under the action of hydrobromic acid to convert its methoxyl into phenolic hydroxyl,which can improve its reactivity and retain its sulfonate group.Furthermore,lignin-based epoxy resin (LBER) is prepared by adding epichlorohydrin into the phenolated SLS under basic condition.LBER,as a crosslinking modifier,is added into the aqueous polyurethane pre-polymer to obtain lignin epoxy resin-waterborne polyurethane emulsion (LBER-WPU) successfully.The effects of LBER dosage on the properties of the dispersion solution and the film are further investigated.The results show that under a LBER dosage of about 0.3%-0.4%,the dispersion solution has better appearance and small particle size,and can be stored for 6 months or above,the tensile strength of the film can reach up to 22 MPa,about 2 times that of unmodified waterborne polyurethane (WPU-0).Both the water resistance and thermal stability of the film are enhanced.

来水利(1965-),男,硕士,教授,研究方向为高分子材料,laisl@sust.edu.cn