Yuan Lei's Little Knowledge | Eight Application Fields and Functional Characteristics of Kaolin

Release time:

2024-01-29 09:34

Kaolin is an important non-metallic mineral resources, mainly composed of small flaky, tubular and laminated kaolinite cluster minerals less than 2 microns (kaolinite, dikonite, perlite, halloysite, etc.), widely used in ceramics, paper, coatings, rubber, plastics, catalysts, adhesives, agricultural carriers and other fields.



1. Papermaking

Kaolin is used in paper, which can increase the brightness and gloss of paper, and improve the ink acceptance and smoothness of fiber paper. Kaolin can also be used as a substitute for pulp.

2. Paint and coating

Kaolin has high chemical stability, high hiding power, high whiteness, good dispersion and suspension properties, which makes it occupy a large market share in the paint and coating industry. At the same time, the specific surface area of the calcined kaolin will increase accordingly, and the absorption capacity of the ink will increase. In addition, the calcined kaolin is more resistant to scrubbing than the uncalcined kaolin, and the effect of the application in the exterior paint is better.

3. Rubber

Kaolin is used in the rubber industry as a filler and reinforcing agent for rubber, which can improve the quality of rubber products. After kaolin powder is mixed with rubber, it can greatly improve the physical and chemical properties of rubber products, and improve the corrosion resistance, wear resistance and stability of rubber products. In addition, kaolin is rich in resources and low in price, which can significantly reduce the cost of rubber products.

4. Plastic

Kaolin is mainly used as a filler in the plastics industry. Since the calcined kaolin has a large adsorption area and activity, its application in plastics can adsorb the conductive ions in the plastics, thereby improving the performance of the plastics, making the plastics more smooth, beautiful, and resistant to chemical corrosion.

5. Wire and cable

Kaolin is also used in insulating electronic materials. Organic polymer materials account for a large proportion of insulating electronic materials. Because organic flame retardants are very harmful to the environment, inorganic flame retardants are gradually replacing traditional organic flame retardants. Modified calcined kaolin has high insulation resistance, so it is widely used in insulating electronic materials. Because it also has the ability to resist seawater erosion, kaolin can also be used in the manufacture of submarine cables, so that the insulation performance of the cable is greatly improved.

6, Ceramics and Refractories

Clay is an essential raw material in ceramic products, accounting for 25-100% of the ceramic body. However, kaolin is only one of the many clays used in the industry. The use rate of kaolin accounts for an average of 25% of pottery, 60% of porcelain, 20-30% of ceramic sanitary ware, and 20% of electric porcelain and wall tiles. Refractory uses include the lining of flat furnaces and blast furnaces in the steel industry, as well as cement and ceramic films.

7. Environmental protection materials

New environmentally friendly materials are also one of the applications of kaolin, which can be used as synthetic molecular sieves and polymeric aluminum chloride. The use of kaolin to produce polyaluminium chloride can improve the quality of the corresponding products, but also reduce the production cost, environmental pollution is small, economic and social benefits are better.

8, Building Materials

Kaolin is also widely used in cement-based materials. Metakaolin, which is prepared by calcining kaolin at appropriate temperature and ultra-fine crushing, is considered to be a new generation of cement concrete admixture. They have obvious improvement and reduction effects on the workability, strength and durability of cement-based materials, and they also have self-shrinkage and shedding phenomena that are common in high-performance cement-based materials.Better inhibition.

Properties, Kaolin, Calcined, Rubber, Medium, Application, Cement, Ceramics, Plastics, Insulation

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