Self-cleaning hydrophilic coating liquid and coating method

Abstract

The present invention discloses a self-cleaning hydrophilic coating liquid, which is prepared from the following components by weight: 1 to 5% of orthosilicate, 0.1 to 5% of titanate, 0.1 to 5% of polyether siloxane, 0.01 to 0.5% of a catalyst and balance of an organic solvent, the orthosilicate is tetramethyl orthosilicate ortetraethyl orthosilicate, the titanate is tetrabutyl titanate or tetraethyl titanate, the polyether siloxane is polyether trimethoxy silane, when the substrate surface is scoured by water, the water can slide down automatically, the substrate also has superior hydrophilicity without ultraviolet radiation, the substrate surface can be cleaned by nature rain effect or a small amount of water for washing, the self-cleaning hydrophilic coating liquid can be can be cured naturally at room temperature without high temperature and other film forming conditions, energy is saved, and scratch resistance, peel resistance and other mechanical strength the coated film layer are greatly increased. The self-cleaning hydrophilic coating liquid is applicable to engineering glass, photovoltaic glass, stone materials, metal surfaces, automotive exterior mirrors and glasses.

Description

technical field [0001] The invention relates to surface self-cleaning protection technology of glass, stone, metal, automobile, etc., in particular to a hydrophilic self-cleaning coating solution and coating method for the surface of glass, stone, metal, ceramic tile, automobile paint surface and other substrates. technical background [0002] Glass on buildings and photovoltaic modules, decorative stone, walls, decorative metal surfaces, car paint, eyeglass lenses, etc., due to the pollution of particulate matter, rain, fog, etc. in the atmosphere, the surface of these substrates will be affected and become dirty, cleaning It is extremely troublesome. According to the incomplete statistics of relevant departments, every year in the process of "Spiderman" cleaning buildings in the whole country, there are thousands of casualties. At present, there are many self-cleaning coating solutions, most of which are water-repellent (hydrophobic). Although they have a certain self-clea...

AI Technical Summary

Problems solved by technology

At present, there are many self-cleaning coating solutions, most of which are water-repellent (hydrophobic). Although they have a certain self-cleaning function, the water-sliding effect is not obvious, and small water droplets are retained. After these small water droplets disappear, they leave a blur Watermarks or water stains, small water droplets also affect the visual field of glass mirrors (such as car exterior mirrors) or the appearance of decorative substrates, while hydrophilic coating solutions refer to the formation of films mainly composed of silicon-oxygen structures on the surface of substrates , this layer of film has a very small contact angle to water, which can make water not form water droplets but form a large area of ​​water film to slide down automatically and clean the substrate automatically. The current hydrophilic titanium dioxide coating solution is mainly improved in photovoltaic Component glass reduces reflection and increases light transmittance, and has the following defects: 1. Its hydrophilicity needs to be excited by ultraviolet light, and it cannot function at night and in rainy days; 2. Coating requires high temperature annealing (generally at ℃), some substrates are not temperature-resistant, and annealing requires energy consumption, and the conditions for use are limited; 3. The mechanical strength is not high, and the scratch resistance and peeling resistance are not strong