适用于玻璃幕墙的TA-CNTs/SiO2黑色透明超亲水涂层及性能研究[1]

Preparation and properties of TA-CNTs / SiO2 black transparent super-hydrophilic coating glass for glass curtain wall

摘要:

为了改善当前幕墙玻璃通过复杂表面处理工艺来降低玻璃透光率、光污染的现状，同时使其具有优异的自清洁和防雾性能。本文以单宁酸（TA）、碳纳米管（CNTs）、树枝状纳米SiO2、正硅酸乙酯（TEOS）等作为基本原料，通过低成本的喷涂工艺把涂层溶液喷涂到空白玻璃基底上经室温固化后得到具有自清洁、防雾效果的TA-CNTs/SiO2黑色透明涂层玻璃，可应用于玻璃幕墙中。采用FT-IR和TG对改性前后的碳纳米管进行分析，通过SEM和WCA对样品形貌进行表征，并探究了TEOS水解液含量对接触角的影响以及改性碳纳米管含量对涂层透光率的影响，最后对样品进行了防雾、自清洁和耐磨性测试。结果表明：当TEOS水解液为6 g、TA-CNTs为0.16 g时，制备的涂层具有超亲水效果（CA，2.5°），并且具有优异的自清洁和防雾效果，碳纳米管的加入使得涂层表面更为粗糙，有利于减少光反射从而降低光污染；当涂层中TA-CNTs含量为0.002 g/cm2时涂层的透光率下降至60%。当涂层中TA-CNTs含量达到0.002 g/cm2时涂层的透光率下降至60%。此时涂层能保持一定透明度的同时具有隐私性，承受120次摩擦实验后依然保持超亲水性，具有良好耐磨性。

Abstract:

In order to improve the current situation of curtain wall glass through complex surface treatment process to reduce the light transmittance and light pollution of glass, and at the same time make it have excellent self-cleaning and anti-fog performance. In this paper, tannic acid (TA), carbon nanotubes (CNTs), dendritic nano-SiO2, ethyl orthosilicate (TEOS) and other basic raw materials were used to spray the solution onto the blank glass substrate through a low-cost spraying process. After curing at room temperature, TA-CNTs / SiO2 coated glass with self-cleaning and anti-fogging was obtained, which can be applied to glass curtain walls. The carbon nanotubes before and after modification were analyzed by Fourier transform infrared (FT-IR) and thermogravimetry (TG). The morphology of the samples was characterized by scanning electron microscope (SEM) and water contact angle (WCA). The effect of TEOS hydrolysate content on the contact angle and the effect of modified carbon nanotube content on the transmittance of the coating were investigated. Finally, the samples were tested for anti-fog, self-cleaning and wear resistance.The results show that when the TEOS hydrolysate is 6 g and the TA-CNTs is 0.16 g, the coating has super-hydrophilic effect ( CA, 2.5 ° ), and has excellent self-cleaning and anti-fogging effects. The addition of carbon nanotubes makes the surface of the coating more rough, which is conducive to reducing light reflection and reducing light pollution. When the content of TA-CNTs in the coating reached 0.002 g / cm2, the transmittance of the coating decreased to 60 %. At this time, the coating can maintain a certain transparency while having privacy. After 120 friction experiments, it still maintains superhydrophilicity and has good wear resistance.