Preparation and properties of lignin-based epoxy resin modified waterborne polyurethane
LAI Shui-li, GE Ru-yue, WANG Hua, LIU Xiao, LI Chen-hui
Key Laboratory of Auxiliary Chemistry & Technology for Light Chemical Industry of Ministry of Education, Shaanxi University of Science & Technology, Xi'an 710021, China
Abstract: 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, 葛茹月, 王花, 刘筱, 李晨辉. 木质素基环氧树脂改性水性聚氨酯的制备及其性能研究[J]. 现代化工, 2020, 40(2): 162-166.
LAI Shui-li, GE Ru-yue, WANG Hua, LIU Xiao, LI Chen-hui. Preparation and properties of lignin-based epoxy resin modified waterborne polyurethane. Modern Chemical Industry, 2020, 40(2): 162-166.
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