水性油墨用环氧改性聚氨酯乳液的合成研究∗

摘要

以环氧树脂(CYD-011)为改性树脂,甲苯二异氰酸酯(TDI)、聚醚二元醇(GE-210)等为主要原料,采用丙酮法制备了环氧改性聚氨酯复合乳液(PUE).并以炭黑为颜料,改性树脂为连接料树脂配制成凹版水性油墨.讨论了初始R (NCO/OH)对乳液和胶膜性能的影响与环氧树脂种类及用量对乳液和水性油墨性能的影响,通过FT-IR、DSC对树脂分子结构进行了分析和表征.研究表明,环氧树脂与聚氨酯发生共聚反应,达到改性目的.当初始R (NCO/OH)为7．5,环氧树脂CYD-011用量为6％时,所得PUE乳液性能最优,由其配制的水性油墨光泽度、耐摩擦性能好,耐水、耐碱性可达5级,满足实际应用要求.%Epoxy modified polyurethane composite emulsion (PUE)was prepared using epoxy resin (CYD-011) as modified resin,toluene diisocyanate (TDI),polyether glycol (GE-210)as main materials by the way of ace-tone.Gravure water based inks was prepared with modified resin as binder and carbon black as pigment.The effect of such factors as the initial R (NCO/OH),the type and content of epoxy resin on the performance of e-mulsion and film were discussed.Additionally the amounts of epoxy resin on the property of the water based inks were researched as well.The emulsions were characterized by FT-IR and DSC.The results showed that ep-oxy resin and polyurethane have occurred graft reaction to achieve the purpose of the modification.It was found that PUE has excellent comprehensive performance with the initial R (NCO/OH)was 7.5,the content of epoxy resin CYD-011was 6%.The Water based inks has ideal gloss and rub resistance,while water resistance,alkali resistance could reached grade 5 and met the requirements of practical application.