Development status and future of water-based ceramic coatings for curtain walls

Water-based ceramic coating for curtain wallis made of nano-silica Or silane as the main raw material, adding water-based resin and curing agent, as well as colorants, thickeners and other preparations, with water or alcohol as a solvent. Usually two-component or multi-component.

Ceramic coating is generally a film material mainly based on SI-O bonds, which not only maintains the original The various advantages of ceramic materials have further improved in flexibility and adhesion. Water-based ceramic coatings do not use organic chemical raw materials such as epoxy, and there are no toxic chemicals such as benzene, formaldehyde, acetaldehyde, ether, phenol, octafluoric acid, and no heavy metals such as arsenic, mercury, chromium, and lead. Environmentally friendly and non-toxic new paint.

Due to its unique film-forming mechanism and the addition of hard materials such as alumina and zirconia, the surface hardness exceeds Any organic paint in the past can reach a pencil hardness of more than 9H. In addition, the dry film mainly composed of inorganic components can withstand higher temperature, and some can reach more than 1200 degrees for a short time. In addition, water-based ceramic coatings also have unique advantages in UV resistance, acid resistance, antibacterial, and antistatic.

Water-based ceramic coating technology for curtain wall originated from Europe, America, Japan and South Korea, and its theoretical basis is the sol-gel in the 1960s technology.

In the 1970s in the United States, the application of silica sol-organosilane composites for coating synthesis was studied, and the obtained transparent film layer The material has high hardness and wear resistance, and was mainly used for surface protection of organic optical materials that appeared in large numbers at that time. Since then, this technology has been gradually promoted and developed around the world.

In the late 20th century in Korea, ceramic coatings that can be applied to aluminum alloys and galvanized sheets, combined with nano-dimensional lotus leaves The film layer can have a safer non-stick effect, coupled with its high hardness and temperature resistance, it has gradually replaced Teflon, which has been criticized for environmental problems, and is widely used in the non-stick pan market. The ceramic coating technology itself has also been more developed, and its applications include optical fibers, wear-resistant materials, thermal insulation materials, ultra-fine powders and so on.

The domestic ceramic material technology has a long history, and the enamel material combined with metal is applied to all aspects of the national economy and people's livelihood. This enamel technology can also be regarded as a generalized ceramic coating. Although this film is resistant to corrosion, high temperature and high hardness, it also has defects such as poor impact resistance, low substrate selectivity, thick coating and high energy consumption.

my country's real sol-gel ceramic coating technology research began in the 1990s, and industrial applications appeared in the early 21st century. At that time, most of the enterprises producing water-based ceramic coatings for curtain walls were concentrated in the Yangtze River Delta and the Pearl River Delta, mainly for non-stick pans. The non-stick pots of water-based ceramic coatings for curtain walls are mostly aluminum or aluminum alloy substrates, and aluminum is a commonly used material in the construction industry. In addition, ceramic coatings are temperature-resistant, weather-resistant, safe and environmentally friendly. This technology has gradually been promoted to aluminum curtain walls, building profiles and even inside and outside. wall and floor. Although there were still many defects in the technology of water-based ceramic coatings for curtain walls at that time, water-based ceramic coatings for curtain walls were practically applied to various construction projects such as subways and tunnels and achieved good results.