硅氧烷溶胶凝胶法制备功能纳米涂层

发布时间：2018-10-10 12:17

【摘要】：随着纳米技术的不断发展,人们对新型功能材料的需求不断增大。将纳米材料与表面涂层技术相结合制备复合功能涂层,有利于扩大纳米材料的应用,成为国际上纳米材料科学的主要研究方向。目前,纳米涂层的制备方法虽然已经很多,但是,受工艺条件、设备等限制,一种简单、环保、应用范围广、可大面积制备的技术仍亟待开发。 本文采用有机硅氧烷3-(甲基丙烯酰氧)丙基三甲氧基硅烷(KH570)为反应单体,乙醇-水混合液为溶剂,通过溶胶-凝胶法制备有机硅基体树脂,并涂覆于玻璃表面。讨论了硅氧烷水解、缩合、固化条件对涂层性能的影响。证实当室温下KH570在95%的乙醇溶液中水解1h,涂覆于玻璃表面后在120℃下加热3h,所得涂层硬度达到5H,附着力为0级,耐老化性能好。利用傅立叶红外光谱技术(FTIR)表征涂层表面固化前后基团变化,分析了涂层固化机理。本方法工艺简单、成本低廉,是纳米功能涂层中基体树脂的理想制备工艺。 以所得KH570溶胶液为介质,与外购纳米TiO2溶胶掺混,获得复合溶胶,将其涂覆到玻璃、PC、PET等基底上,再经过120℃加热固化3h,得到透明涂层。考察了纳米TiO2固含量对涂层光致超亲水性能和透明度的影响,用SEM观察了涂层表面结构。结果表明,复合溶胶液中Ti02固含量为0.24%时,所得涂层综合性能最好。涂层经过紫外照射10min后,表面静态接触角降为0°,可见光透过率达90%以上。本研究为简单、经济、大面积制备Ti02自清洁涂层提供了新思路。 采用同样技术,以所得KH570溶胶液为介质,与外购纳米ATO-乙醇浆液掺混,然后涂覆于玻璃、PC、PET等基底上,以制备新型透明隔热涂层。考察了ATO固含量对涂层性实际隔热效果和光谱响应的影响,用SEM观察了涂层表面结构。发现当复合溶胶中ATO固含量为10%时,涂层综合性能最佳。涂有ATO涂层的玻璃基材遮盖的泡沫塑料箱内温度较空白基材对应箱内温度低13℃,涂层在可见光区的透过率在85%左右,红外线阻隔率达到70%左右。涂有ATO涂层的PC基材遮盖的泡沫塑料箱内温度较空白基材对应箱内温度低10℃,涂层在可见光区的透过率在80%左右,红外线阻隔率达到70%左右。涂有ATO涂层的PET基材遮盖的泡沫塑料箱内温度较空白基材对应箱内温度低10℃,涂层在可见光区的透过率在60%左右,红外线阻隔率达到80%左右。本实验所得聚硅氧烷基质涂层改善了现有聚氨酯涂层硬度、耐老化、耐水等性能不佳的缺点。
[Abstract]:With the development of nanotechnology, the demand for new functional materials is increasing. The preparation of composite functional coatings by combining nanomaterials with surface coating technology is beneficial to expand the application of nanomaterials and become the main research direction of nanomaterials science in the world. At present, there are many preparation methods of nano-coating, but due to the technical conditions, equipment and other limitations, a simple, environmentally friendly, wide range of applications, can be prepared in a large area of technology still need to be developed. In this paper, organosiloxane 3- (methacryloxy) propyltrimethoxysilane (KH570) was used as reactive monomer and ethanol-water mixture as solvent. Silicone matrix resin was prepared by sol-gel method and coated on glass surface. The effects of hydrolysis, condensation and curing conditions of siloxane on the properties of the coating were discussed. The results show that when KH570 is hydrolyzed in 95% ethanol solution at room temperature for 1 h, then coated on the glass surface for 3 h at 120 鈩，

本文编号：2261740