光学硅橡胶表面低透气性涂层的制备与性能研究

Study on the Preparation and Performance of Low Permeability Coating on Optical Silicone Rubber Surface

摘要:

通过合成折射率与白炭黑相匹配的苯基乙烯基硅油和苯基含氢硅油，以白炭黑补强，固化后获得光学透明的苯基硅橡胶，然后以四甲基己二胺为催化剂，使喷涂在苯基硅橡胶表面的有机聚硅氮烷（OPSZ）实现低温固化及硅质转变，获得具有低气体渗透性的致密涂层，并对涂层的光学性能、透氧量、抗硫化性能进行测试和表征，结果表明：OPSZ涂层表面连续、均匀、致密，无裂纹和空隙。涂层断面致密均匀，无缝隙和裂纹，当涂层厚度低于32~35μm时，涂层与硅橡胶间的粘接力良好。固化后的OPSZ显示出优秀的透明度、透光性能和气体屏蔽性能。当涂层厚度达到12μm以后，透氧量保持不变，涂覆涂层后的封装灯珠均显示良好的抗硫化能力，硫化后光通量维持率在99.9%以上。提高加热温度和相对湿度，可以有效地缩短硅质转化的时间。

Abstract:

Phenyl vinyl silicone oil and phenyl hydrogen silicone oil of which the refractive index match with fumed silica are prepared, and then add fumed silica as reinforcing fillers to prepare optical transparent phenyl silicone rubber. By using tetramethyl hexamethylene diamine as a catalyst, organic polysilazane (OPSZ) coated on a silicone rubber surface achieves low-temperature curing and siliceous transition, and a dense coating having low gas permeability is obtained. Optical performance, oxygen permeation flux, and anti-sulfuration are then tested, the results show that the OPSZ coating surface is continuous, uniform, dense and free of cracks and voids, while the coating section is dense, uniform, seamless, without cracks, and have good adhesion to the silicone rubber when the coating thickness was < 32-35μm. The coatings have excellent transparency, light transmission and gas shielding properties. With a coating thickness of over 12μm, the oxygen permeation flux remains unchanged, lamps after coating have good anti-sulfuration ability, and the luminous flux maintains over 99.9%. The siliceous conversion time can be effectively shortened by increasing the heating temperature and relative humidity.