一体化聚氨酯丙烯酸酯的合成及其在光固化数码印花中的应用

摘要

为改善光固化数码印花织物的安全性、手感与牢度,设计合成了有机硅氨基改性光敏聚氨酯丙烯酸酯低聚物,并对其流变性能,光聚合性能,以及固化膜物理力学及光学等性能进行测试分析.研究结果表明:该聚氨酯丙烯酸酯兼具低黏、低模量、高柔弹和助引发一体化功能.有机硅氨基改性光敏聚氨酯丙烯酸酯共聚膜因其有机硅链段向膜表面迁移,当有机硅含量为5%时其固化膜力学性能损失小且具有较好的柔顺性和耐水性.以合成的改性聚氨酯丙烯酸酯和丙烯酸羟乙酯复配构建光固化聚合体系,配制光敏剂樟脑醌、着色剂颜料及相关助剂,制备光固化数码喷墨印花墨水,其最终转化率为96%,可见光透过率大于95%,拉伸应力为1.5 MPa,最大断裂伸长率为530%,100%伸长应力低于0.4 MPa.应用光固化数码喷墨印花制备的织物,其摩擦牢度可达4级.%A series of organosilicone and amino modified photosensitive polyurethane acrylate(PUA) were designed and synthesized for improving the safety,handfeeling and rubbing fastness of photo-curable ink-jet printing fabrics. According to the research of the rheological properties,photo initiated properties, tensile properties,optical properties and SEM analysis,the polyurethane acrylate has integrated function of low viscosity and modulus, high flexibility and co-initiation. While curing, the copolymer siloxane chain segments migrates to the film surface. The cured film has better flexibility and water resistance while the mechanical property loss is small when the content of organosilicone is 5%. The photo-curable ink-jet printing ink was prepared successfully by mixing a photocurable polymerization system composed of the modified PUA and hydroxyethyl acrylate, 2-hydroxyethyl acrylate, camphorquinone and other additives, and has the conversion rate of 96%, the transparency above 95%,the tensile stress of 1.5 MPa, the maximum elongation at break of 530%,and 100% elongation stress lower than 0.4 MPa, low toxicity and good stability. The fabric subjected to the photo curing ink-jet printing has good rubbing fastness up to grade 4.