在工业生产中,STN 液晶取向剂在以薄膜形式涂覆在玻璃基板表面并进行热固化后,需要用溶剂对其进行洗涤。在洗涤中,薄膜从玻璃基板上脱落的现象时有发生。针对这种现象,需要一种添加剂,在不影响 STN 液晶取向剂的粘度、外观、预倾角、硬度等性质的同时,提高其粘接性能。在液晶取向剂中引入了 N-苯基-3-氨基丙基三甲氧基硅烷(Y9669)添加剂,将硅烷添加剂以不同添加比例与取向剂搅拌混合后,得到5份添加剂含量不同的溶液。表征并对比了含有不同含量添加剂的 STN 液晶取向剂的粘度、外观、预倾角、硬度、粘接性等性质。实验结果表明：对于 STN 液晶取向剂体系,硅烷添加剂 Y9669的最佳添加比例为取向剂固含量的0.5%,此时得到的取向剂综合性能更加优异。硅烷添加剂 Y9669基本能够达到在不影响取向剂其他性能的同时,提高其对基板粘接性能的要求。
When the STN liquid crystal alignment agent is filmed and thermoformed on the surface of glass substrates in industrial production,it is necessary to clean the substrates with solvents.In the process of cleaning,the film often peels off from its substrate.To tackle this problem,an additive is required to improve the adhesive performance of the agent without sacrificing its viscosity,outlook, pretilt angle and hardness.A silane additive N-[3-(trimethoxysilyl)propyl]aniline (Y9669)is intro-duced into the agent.Five solutions were prepared for the agent in mixture with the additive in differ-ent proportions.The viscosity,outlook,pretilt angle,hardness and etc.of the solutions were exam-ined.The STN liquid crystal alignment agent system reaches its best overall performance when the si-lane additive Y9669 is added 0.5% equal to the solid content of the agent.The silane additive Y9669 could improve the adhesive performance to the substrate with almost no impact on the other perfor-mances of the agent.
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