基于核壳型乳液粒子的亲和性变化型热敏材料体系的制备及性能评价

Preparation and Performance of a Thermo-sensitive Latex Film Based on Core-shell Latex Particles

为了研制可中性水显影的亲和性变化型热敏成像体系,设计合成了一种反应型加成裂解链转移剂(DT-PA),在它存在的条件下进行丙烯酸的聚合,得到平均聚合度为5的反应性大分子乳化剂(DTPA AA 5)。利用该乳化剂的钠盐作为表面活性剂,制备了具有亲油内核和表面含有高密度羧酸盐基团的核壳型乳液,该乳液固含量高、稳定性好。将该乳液与水溶性成膜树脂聚乙烯醇(PVA1788)配合使用并制备了乳液薄膜。该乳液薄膜能被中性水洗掉,但经160℃烤版后失去水溶性。当在该体系中引入一种红外增感染料(最大吸收为830nm)后,所制备的薄膜可用830nm的红外激光曝光成像,中性水显影后可得到阴图型图像。为实现更好的成膜性,该体系的配方仍需调整。

In this study,a thermo-sensitive system based on latex particles in water-developable was introduced. At first, a new reactive emulsifier was synthesized and then used to prepare latex particles through soapless emulsion polymerization. Thermo-sensitive latex films were in sequence prepared with such latex particles and small amount of the hinder polymer,PVA1788, it was obtained that the latex films could be easily washed away from the substrate in neutral water, but not so after heat treatment at 160℃ for even a short period of time. When an IR dye was incorporated into the latex films, the films became sensitive to LD lasers. Based on these results the negative images were obtained after exposing the film to LD laser and developing by neutral water.