高固含量环氧改性磺酸盐型水性聚氨酯的合成与表征  

Synthesis and Characterization of High Solid Epoxy Resin Modified Sulphonated Waterborne Polyurethane

作　　者：李伟[1] 夏正斌[1] 宁蕾[1] 

机构地区：[1]华南理工大学化学与化工学院,广州510640

出　　处：《涂料工业》2011年第9期1-4,9,共5页Paint & Coatings Industry

摘　　要：以异氟尔酮二异氰酸酯(IPDI)、六亚甲基二异氰酸酯(HDI)、聚己二酸-1,4-丁二醇酯(PBA)为主要原料,以1,4-丁二醇为小分子扩链剂,以乙二胺基乙磺酸钠为亲水性扩链剂,并用环氧树脂E-51作为改性剂,得到固含量为50%的环氧树脂改性磺酸盐型水性聚氨酯乳液SWPU-E。实验研究了环氧用量对乳液的粒径及其分布和对胶膜力学性能的影响;实验还采用红外、核磁、热重分析等方法对胶膜的结构和热稳定性等进行了深入的分析。结果表明:环氧树脂的羟基和环氧基团参与了反应,生成了环氧改性的水性聚氨酯结构;随着环氧用量的增加,乳液的平均粒径从95.8 nm增加到169 nm,粒径分布变宽;胶膜的拉伸强度随之变大,当环氧用量低于4%时,拉伸强度明显增加,由16.21 MPa增加到43.7 MPa,之后拉伸强度增加缓慢;胶膜的热稳定性随环氧用量的增加得到明显提高,初始分解温度、转折点温度、分解终点温度均朝高温方向移动。A high solid（50% ） sulphonated waterborne polyurethane emulsions（ SWPU -E） was synthesized by using polyethylene glycol adipate diol （PBA）, isophorone diisocyanate （IPDI） and hexamethylene diisocyanate （HDI） as main raw materials, N - （2 - aminoethyl） - amino ethane sulphonated sodium as hydrophilic chain extender, and epoxy resin E - 51 as a modifier. The influences of the amount of epoxy resin on emulsion particle size and distribution, and mechanical properties were investigated. The structure and thermo physical properties of emulsion films were characterized by FT - IR,^ 1H - NMR and TGA. The results showed that the particle size increased from 95.8 nm to 169 nm and the particle size distribution became wider with increasing of the content of epoxy resin. The films with higher content of epoxy resin provid- ed higher tensile strength. The tensile strength increased obviously from 16.21 MPa up to 43.7 MPa when the content of the epoxy resin was lower than 4.0% and after that it increased slightly. The thermal stability of the films was improved dramatically by increasing the amount of epoxy resin.

关 键 词：磺酸盐 水性聚氨酯 环氧树脂 高固含量 

分 类 号：TQ630.43[化学工程—精细化工]