摘要
采用甲苯二异氰酸酯(TDI)、聚醚二元醇(GE-210)、1,4-丁二醇(BDO)、二羟甲基丙酸(DMPA)、环氧树脂(E-128)和丙烯酸羟丙酯(HPA)为主要原料,制备环氧改性水性聚氨酯乳液。研究预聚体中的—NCO和—OH物质的量之比(R)及小分子扩链剂、亲水扩链剂、环氧树脂的加入量,对粒径、黏度、贮存稳定性和涂膜耐水性的影响。实验结果表明:预聚体中R值为6～7;小分子扩链剂BDO用量为7%～8%;亲水扩链剂DMPA的用量为6%～7%;环氧树脂添加量为6%～7%时,乳液外观及稳定性最好,涂膜的耐水性能优异,可以作为一种性能优异的涂料用水性聚氨酯树脂。
The title waterborne polyurethane emulsion modified by epoxy resin was prepared using toluene diisocyanate （ TDI）, polyether （ GE - 210）, 1,4 - butanediol （ BDO）, dimethylolpropionic acid （ DMPA）, epoxy resin and hydroxypropyl acrylate （ HPA ）. Effects of the molar ratio of the --NCO and the --OH group in the prepolymer （R）, the content of small molecule chain extenders, hydrophilic chain extender and epoxy resin on the size, viscosity, stability of the emulsion and water - resistance of the film was studied. The experimental results showed that the water resistance of WPU was improved, when the R was 6 -7, BDO addition level was about 7% -8%, DMPA 6% - 7%, epoxy resin 6% -7%, as well as good appearance and stability of the emulsion, which could be used as a WPU resin for waterborne coatings with excellent performance.
出处
《涂料工业》
CAS
CSCD
北大核心
2012年第4期36-40,43,共6页
Paint & Coatings Industry
关键词
环氧树脂
改性
水性聚氨酯
epoxy resin
modification
waterborne polyurethane
