阳离子型水性丙烯酸酯聚氨酯塑料涂料的研究

Study on cationic two-component waterborne acrylic-polyurethane plastic coatings

合成了阳离子型羟基丙烯酸酯树脂分散体（A组分），其与多异氰酸酯固化剂（B组分）配制的双组分水性聚氨酯涂料可用于ABS、PC／ABS、PC、PVC等塑料制件的表面涂装。研究了甲基丙烯酸-N，N-二甲氨基乙酯（DMAEMA）、丙烯酸羟乙酯（HEA）用量，硬单体甲基丙烯酸甲酯与软单体丙烯酸丁酯（MMA／BA）的质量比及A、B组分（NCO／OH）物质的量比对聚氨酯涂膜性能的影响，采用FT—IR和DSC对固化膜结构进行了表征。结果表明：DMAEMA用量为5％，HEA用量为15％，m（MMA）／m（BA）=2，n（NCO）／n（OH）=1．2～1．4可得到力学性能、耐水性、耐化学品性优秀的涂膜。

Cationic acrylic resin dispersions were synthesized. Two - component waterborne polyurethane coatings used on ABS, PC/ABS, PC, PVC were obtained by mixing component A and B. Effects of DMAEMA content, HEA content, M MA/BA ratio and NCO/OH ratio on properties of two- component polyurethane film were studied . The structures of acrylic resin dispersion and its curing film were characterized by FT - IR and DSC. The results showed that a good film with better mechanical properties, water resisdant and chemicals resisdant was obtained at the following conditions： DMAEMA content 5%, HEA content 15%, the weight ratio of MMA/BA 2 and the molar ratio of NCO/OH 1.2- 1.4.