材料期刊网

以异氟尔酮二异氰酸酯(IPDI)、磺酸型聚酯二元醇(SPOL)、1,4丁二醇(BDO)、丙烯酸羟乙酯(HEA)和乙二胺(EDA)为原料,制备了磺酸型水性聚氨酯(SWPU).然后用丙烯酸丁酯(BA)和甲基丙烯酸甲酯(MMA)混合单体对SWPU共聚改性,得到了不含有机溶剂无胺类刺激性气味的高固含量磺酸型水性聚氨酯-聚丙烯酸酯(SWPUA).利用透射电镜(TEM)、粒径分布仪对乳液的胶束形态、粒径进行了表征；利用 X射线衍射仪(XRD)、热重分析仪(TGA)、拉力试验机对胶膜的结晶度、热稳定性、力学性能进行了分析.分析结果表明,所制备的SWPUA为核壳结构,胶膜的结晶强度为3．76％,耐热性比SWPU提高了22℃.当 SPOL含量为40％、n(NCO)/n(OH)(R 值)为1．7时,乳液稳定期达到12个月,平均粒径为44 nm,固含量可达50％以上.

Waterborne polyurethane containing sulfonated soft segment (SWPU)was prepared with isophorone diisocyanate (IPDI)and sulfonated polyester-diol (SPOL)as main raw materials,then the sulfonated water-borne polyurethane-polyacrylate (SWPUA)composite emulsion was obtained by copolymerization with mixture monomers methylmethacrylate (MMA)and butylacrylate (BA).The synthesis process of SWPUA was simple and easy to control without any organic solvent and amine-free.The micellar conformation and diameter of the composite emulsion were characterized by transmission electron microscopic (TEM)and diameter analyzer.The crystallinity,thermal stability,mechanical properties and water resistance of films were investigated by X-ray diffraction analysis (XRD),thermogravimetric analysis (TGA)and tension test.The results showed that core-shell structure had formed between polyurethane and polyacrylate,degree of crystallinity of the films was 3. 76%.After modified by polyacrylate,the thermal stability of SWPUA increased by 22 ℃.When the SPOL con-tent was 40%,NCO/OH molar ratio (R)was 1.7,SWPUA with 50% solid content was obtained,the emul-sion of SWPUA showed good appearance,and the average particle size and storage stability were 44 nm and 1 2 months.