高强度双组分聚氨酯防水涂料力学性能  

Research on Mechanical Property of High-Strength Two-Component Polyurethane Waterproof Coating

作　　者：冯筱倩 王楠[1] 张金铭 张高文[1] FENG Xiaoqian;WANG Nan;ZHANG Jinming;ZHANG Gaowen(Hubei Provincial Key Laboratory of Green Materials for Light Industry,Hubei Univ.of Tech.,Wuhan 430068,China)

机构地区：[1]湖北工业大学绿色轻工材料湖北省重点实验室,湖北武汉430068

出　　处：《湖北工业大学学报》2021年第5期70-72,90,共4页Journal of Hubei University of Technology

基　　金：国家自然科学基金(52073083)。

摘　　要：采用两步预聚法,以二苯基甲烷二异氰酸酯(MDI)和聚醚多元醇为原料合成A组分预聚物,并与含少量聚醚多元醇和固化剂的B组分配合制备了一种环保型高强度双组分聚氨酯防水涂料。采用电子拉力机、扫描电子显微镜(SEM)对防水涂膜的力学性能及微观结构进行分析。结果表明,采用含更多苯环的异氰酸酯(MDI)为单体能得到强度更高的涂膜,且单体一次性单独加入时能进一步提高涂膜强度;随着A组分中R值的提高,拉伸强度呈递增趋势,但会导致断裂伸长率降低;采用非有机硅类消泡剂具有更好的消泡作用,有利于涂膜力学强度的提高。The two-step prepolymerization method is used to synthesize the A-component prepolymer with raw materials diphenylmethane diisocyanate(MDI)and polyether polyol.The A—component prepolymer is then prepared with B component containing a small amount of polyether polyol and curing agent to obtain the environmentally friendly high-strength two-component polyurethane waterproof coating.The mechanical properties and microstructure of the waterproof coating film were analyzed by electronic tensile machine and the scanning electron microscope(SEM).The results show that the use of isocyanate MDI with more benzene ring as the monomer can obtain a higher strength coating film.And when the monomer is added separately at one time,the strength of the coating film can be further improved.With the increase of the R value in the A component,the tensile strength tends to increase,whereas the elongation at break tends to decrease.The use of non-silicone defoamers has better defoaming effect and is beneficial to the improvement of the mechanical strength of the coating film.

关 键 词：聚氨酯 防水涂料 双组分 高强度 

分 类 号：TQ423.95[化学工程]