In life, we often encounter all kinds of objects made of glass, such as dressing tables most commonly used by girls, windows at home, windows on cars, and even those high-rise buildings. The outer curtain wall is made of glass. Because the glass surface is smooth, oily substances in nature are easy to bind to the surface with dust, so the glass surface is prone to stains, and pure water cannot clear it. Whenever a house is cleaned, how to quickly and effectively remove the stains on the glass surface is the biggest worry for people, not to mention that high-rise building, and the curtain wall glass is a huge one. engineering. Therefore, in order to solve this problem, self-cleaning glass came into being.
Building envelopes (curtain walls)
According to the global self-cleaning glass market report, the global self-cleaning glass market size has grown from USD 83.6 million in 2014 to USD 94.9 million in 2017. It is estimated that by 2025, the global market value of self-cleaning glass is expected to reach 134.7 million US dollars, and the annual market growth rate will exceed 4.60%. It can be seen that there is huge market potential for self-cleaning glass.
1. Introduction of self-cleaning glass
Self-cleaning glass refers to glass with its own cleaning function. By coating nano-semiconductor materials on the surface of ordinary glass, the glass surface has the ability to degrade organic pollutants attached to its surface under the excitation of sunlight. Among them, as one of the most important nano-semiconductor materials, titanium dioxide thin film is used to make ordinary glass have a self-cleaning function. Because titanium dioxide can produce good photocatalytic properties and super hydrophilicity under the action of (ultraviolet) light energy, the organic materials are finally oxidized into small inorganic molecules such as CO2 and H2O, and then their super hydrophilic properties are used. Rainwater is on the film layer. Spread out and fully wash the glass to take away the contaminated particles, so that the glass achieves the effect of self-cleaning.
How self-cleaning glass works
Super-hydrophilic principle
2. Types and comparison of titanium dioxide
① Comparison of nano TiO2 and conventional TiO2
Nano titanium oxide photo self-cleaning, photocatalysis, air purification and other properties. Nano TiO2 (such as CY-TA18) has much higher photocatalytic activity than conventional TiO2 (titanium dioxide), and the particle size of nano TiO2 particles is small, which is conducive to gain or loss of electrons, and has stronger oxidation and reduction capabilities. The surface area per gram of powder of conventional titanium oxide is negligibly small, while the surface area per gram of nano-titanium oxide CY-TA18 of Jiopeng new material can reach more than 100 square meters, and the surface area of 5-nm CY05 reaches 300-400 square meters The exponential increase in the surface area of grams of titanium oxide is thousands of times, so that nano titanium oxide (such as CY-TA18) has the properties of light self-cleaning, photocatalysis, and air purification that conventional titanium oxide (titanium dioxide) does not have.
② Difficulties in using nano TiO2 powder and nano TiO2 film
Nano-TiO2 powder is very easy to agglomerate and difficult to disperse, which makes it difficult to develop a large number of nano-TiO2 applications. In order to solve the dispersion problem of nano titanium oxide. In response to this problem, Jiupeng New Materials has developed a series of nano titanium oxide aqueous dispersions, organic dispersions and sols, such as 5 nanometer titanium oxide CY05, which is self-dispersed in water or solvent, and nano titanium oxide transparent water dispersion CY-TA33. Makes the wide application of nano titanium oxide. The nano-titanium dioxide film is coated with a nano-film on the substrate by a certain coating method. Usually, it is coated with a titanium oxide dispersion, which can easily reflect the photocatalytic degradation of high-molecular organic substances, odorous toxic substances such as formaldehyde, etc. Shows good light self-cleaning and indoor air purification effect, is the best choice for healthy living and beautifying the environment.
3． Preparation method of nano titanium dioxide film
There are many methods for preparing nano titanium dioxide thin films, including film-forming methods based on solution-gel technology, physical or chemical vapor deposition methods, electrodeposition methods, and active nano-TiO2 powder film-forming methods. Among them, the simpler and easier way is the film formation method of active nano TiO2 powder. The researchers of Jiupeng New Materials can evenly disperse organic TiO2 powder by preparing highly active nano TiO2 powder (CY05, CY-TA18, etc.) or titanium oxide dispersion. In the film-forming aid, a nano coating is formed, and then coated on a substrate, and then dried and hardened to obtain a titanium oxide nano film.