Yuan Lei's Little Knowledge | Application (II) of Quasi-spherical Silica Powder in Functional Coatings
In the coating industry, silicon powder as a functional coating filler, although the amount is not a lot, but has a good competitive advantage, especially quasi-spherical silicon powder.
Quasi-spherical silica powder is processed from natural micro-crystalline quartzite after long-term weathering in nature and is produced in a finely divided form. It has high purity, fine particles, good dielectric properties and thermal conductivity, and has the advantages of low expansion coefficient, high heat resistance, high humidity resistance, high filling amount, low expansion, low stress, low impurities, low friction coefficient, etc. It plays an important role in functional coatings.
1. Application of quasi-spherical silica powder in high temperature resistant powder coatings
The preparation of high temperature resistant powder coatings mainly starts from two aspects, one is to use the heat resistance stability of silicone resin, and the other is to use the heat resistance of quasi spherical silicon powder. High temperature resistant powder coating by a single resin or filler can not meet the requirements of high temperature resistance, quasi spherical silicon powder, talc powder filler is the skeleton of heat resistant coating, can greatly improve the performance of the coating.
2. Application of quasi-spherical silica powder in insulating powder coatings
Insulation powder coating requirements of the technical indicators are more stringent, moisture resistance, flame retardancy, breakdown voltage and other indicators are the application of quasi spherical silicon powder heat resistance, density to complete.
3. Application of quasi-spherical silica powder in flame retardant powder coatings
At present, the main varieties of flame retardant powder coatings are epoxy powder coatings, which are generally configured by adding flame retardants (additive type) or introducing flame retardant groups (reactive type) into the polymer chain of resin base materials, and then matching temperature resistant pigments, fillers, etc. Among them, the choice of filler plays a great role in improving the flame retardant effect of powder coating. Quasi spherical silica powder has the highest heat resistance, so it becomes the preferred filler for flame retardant powder coatings.
In recent years, with the development and application of various special functional coatings, silicon powder has been paid more and more attention by coating users due to its excellent performance such as temperature resistance, weather resistance, abrasion resistance and corrosion resistance.
Spherical, silica powder, powder coating, filler, application, coating, high temperature resistance, flame retardant, heat resistance
Kaolin is a non-metallic mineral, which is a kind of clay and clay rock mainly composed of kaolinite clay minerals. Because it is white and delicate, also known as white earth. It is named after Gaoling Village, Jingdezhen, Jiangxi Province.
Barium sulfate is based on barite as the main raw material, through beneficiation, ore washing, crushing and other processes. Barium sulfate has a hardness of 3~3.5 (Mohs) and a specific gravity of 4.3~4.7. It has the characteristics of high specific gravity, low hardness and brittleness. Barite is almost insoluble in water, ethanol and acid, soluble in hot concentrated sulfuric acid. With the development of some high-performance barium sulfate products, the application field of barium sulfate is constantly expanding.