附着力增强型EG-BPSQ/SiO2防雾减反射涂层的设计制备

Design and preparation of adhesion-enhanced EG-BPSQ/SiO2 antifogging and antireflective coatings

摘要:

传统溶胶-凝胶法制备的二氧化硅(SiO₂)减反射涂层折射率低,减反射性能优异,但是其附着力较差,大大缩短了减反射涂层的使用寿命。通过在SiO₂溶胶中引入有机桥连聚倍半硅氧烷(EG-BPSQ),以增强SiO₂纳米颗粒彼此之间和涂层与基底之间的黏结作用,然后对所制备的复合涂层进行热处理,得到一系列附着力与减反射性能良好的防雾减反射涂层。重点研究了EG-BPSQ添加量对复合涂层微观结构、光学性能和附着力的影响规律。实验结果表明EG-BPSQ同时具有着‘’黏结‘’与‘’造孔‘’的作用,当后处理温度为150℃时,复合涂层不仅最高透过率高达98.5%,相比空白基底提高约8%,而且具有防雾效果,附着力均达到0级。

Abstract:

The silicon dioxide (SiO₂) antireflective coatings which were fabricated by traditional sol-gel method performed excellent antireflective property due to their low refractive index. However, their adhesion was very poor which strictly restricted their application fields. In this paper, organic-bridged polysilsesquioxane EG-BPSQ was introduced into SiO₂ sol to enhance the adhesion between SiO₂ nanoparticles as well as between coating and substrate. By post-treatment of different temperature, a series of antifogging and antireflective coatings with enhanced adhesion were obtained. Furtherly, the effects of EG-BPSQ addition on the microstructure, optical property and adhesion of composite coatings and different post-treatment temperature on the optical property and antifogging property were both investigated. The experimental results showed that EG-BPSQ plays the dual roles of bonding and pore-forming. When the post-treatment temperature was 150℃, the composite coatings not only performed good antireflective property with the transmittance as high as 98.5% which was approximately 8% enhancement compared to that of blank substrate, but also exhibited antifogging property. Besides, all the composite coatings adhesion level was 0 grade.