Cenospheres is a substance extracted from fly ash. It has various properties such as fine particle size, large specific surface area, and excellent electrical insulation. It is widely used in various fields. What are the advantages of application in the coating industry? A- Advantages of cenospheres in the coating industry 1. The amount of resin is small. Because of the small surface area of ​​a spherical shape in any shape, the beads require less resin. Particle packing is also improved. The broad particle size distribution of cenospheres enables small microspheres to fill the voids between large microspheres. ​​ 2. Improve liquidity. Unlike irregularly shaped particles, cenospheres roll easily between each other, improving fluidity. This results in lower viscosity and better flow properties for systems using cenospheres. Also, sprayability is improved. ​​ 3. High hardness and strength. Cenospheres are high-strength, hard microspheres that enhance the hardness, scrub resistance and abrasion resistance of coatings. ​​ 4. Good thermal insulation effect. Due to the hollow spherical structure of cenospheres, it has excellent thermal insulation effect when filled in coatings. ​​ 5. Can control the gloss. As a filler, cenospheres can reduce gloss, and even in the case of high addition requirements, they can eliminate the large increase in viscosity that common matting agents tend to cause, and they are also low cost. ​​ 6. Specific inert ingredients. Cenospheres are composed of inert ingredients, resulting in excellent durability, weather resistance, corrosion resistance and chemical resistance. ​​ 7. Increase coverage. Cenospheres are hollow spheres that slow and scatter light and are opaque, which in turn increases the hiding power of the paint. ​​ 8. Dispersion. Cenospheres are dispersed like mineral fillers. Due to their thick walls and high compressive strength, cenospheres can withstand the processing of all types of mixers, extruders and molding machines. ​​ 9. No crystalline silicon pollution. Unlike other fillers, the content of crystalline silicon in cenospheres is below non-hazardous levels. Cenospheres are not considered hazardous and do not require special warning signs. ​​ Second, the main coating products used by cenospheres ​​ B. Thermal insulation coating ​​ Since the temperature resistance of cenospheres is as high as 1500 degrees and the thermal conductivity is small, it can be added to the coating as a thermal insulation material, which can significantly increase the thermal insulation effect of the coating. Using cenospheres as the main raw material, a low-solid content high-temperature heat-resistant thermal insulation spray coating is prepared, which has the characteristics of lightweight and controllable shrinkage after burning. Some researchers found that the addition of cenospheres to the coating significantly improved the thermal insulation effect of the coating. When the dosage was 9%, the thermal insulation effect was ideal. ​​ 2. Flame retardant fire retardant coating ​​ Cenospheres have high refractory temperature and have the characteristics of non-combustibility, non-deformation and smoke-free under high temperature. They are fire-resistant and flame-retardant inorganic non-metallic materials and are good fillers for the production of fire-retardant and flame-retardant coatings. Adding about 60 parts of paint mixed with more than 10 kinds of raw materials, the product has excellent adhesion, good flame retardant effect and remarkable noise reduction effect, and has remarkable high and low-temperature resistance. ​​ 3. Industrial anti-corrosion coatings ​​ Cenospheres have also achieved good results in anti-corrosion and anti-rust coatings. It can add 6~10 points of cenospheres to prepare a non-expansive steel structure anti-corrosion coating, which is mainly used for the anti-corrosion protection of steel structures in the construction of the project. The coating has good corrosion resistance and high temperature resistance, and is used in chemical equipment. Not easy to fall off, long service life ​​ 4. Waterproof coating ​​ The water absorption rate of cenospheres is low, about 5%, and the water droplets are dew-like on the cenospheres, indicating that the cenospheres have good waterproof performance and can be used as a filler for waterproof coatings. The polymer cement-based waterproof coating is developed by using floating beads and montmorillonite, adding cenospheres, improving the fluidity of the cement slurry and reducing the production cost. 15% cenospheres are added in the production, and the product has good waterproof performance. ​​ 5. Other coatings ​​ Using cenospheres as filler, in addition to the above coatings, dry powder reflective thermal insulation coatings with low thermal conductivity, high reflectivity, high wear resistance, high flame retardancy and high weather resistance can also be developed. It has anti-corrosion and acid and alkali resistance. When the coating is very thin, it is flammable and has a good anti-lightning strike performance.