氟硅树脂共混复配对透明疏水涂层性能的影响

Effect of the blending with fluorosilicone resin on properties of transparent and hydrophobic coating

[目的]采用低表面能且耐候性较好的氟硅树脂(FSi)作为基底材料,与光泽度较好的双酚A型环氧丙烯酸树脂(EPA)或者环氧树脂(E51)共混,制备出适用于玻璃基底的透过率高、力学性能好的疏水涂层,探讨不同树脂配比对涂层性能的影响。[方法]通过扫描电镜、接触角测量仪、紫外可见分光光度计、附着力拉拔测试仪和铅笔硬度计,对涂层进行性能测试及微观形貌表征。[结果]随着FSi含量的增大,涂层性能会受到一定影响。FSi与E51复配的效果优于FSi与EPA复配。当FSi与E51的质量比为1∶1时,涂层的附着力可达6.16 MPa,铅笔硬度3H,水接触角124.98°,透过率在可见光波长范围内可达70%以上,吸水率则只有3%~6%,磨损后的质量损失最小且水接触角仍维持在105°左右。[结论]以氟硅树脂为基底复配环氧树脂作为成膜物,可以提高透明疏水涂层的性能,具有较好的应用前景。

[Introduction]A hydrophobic coating with high light transmittance and excellent mechanical properties was prepared by blending fluorosilicone resin(FSi),which has low surface energy and good weather resistance,with bisphenol A type epoxy acrylic resin(EPA)or E51-type epoxy resin as binders.The effects of the proportions of different resins on the properties of coating were discussed.[Method]The properties and surface morphology of the coating were examined by using scanning electron microscope,contact angle measuring instrument,ultraviolet-visible spectrophotometer,pull-off adhesion tester,and pencil hardness tester.[Result]The properties of coating were affected with the increasing of the amount of FSi resin.The combination of FSi and E51 resins was better than that of FSi and EPA resins.The coating prepared at a FSi-to-E51 mass ratio of 1:1 featured an adhesion strength of 6.16 MPa,a pencil hardness of 3H,a water contact angle of 124.98°,a transmittance higher than 70%in the wavelength range of visible light,and a water absorption rate as low as 3%to 6%.Its weight loss is the smallest among the tested coatings after wear test,and its water contact angle maintained at about 105°.[Conclusion]The combination of fluorosilicone resin and epoxy-based resin as binders improves the properties of transparent and hydrophobic coating,which has a good application prospect.