Yuan Lei's Little Knowledge | What are the differences in the application fields of different kaolin
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.
Kaolin has a wide range of uses, mainly used in papermaking, ceramics and refractory materials, followed by coatings, rubber fillers, enamel glazes and white cement raw materials, and a small amount of plastics, paints, pigments, grinding wheels, pencils, daily cosmetics, soap, Pesticides, medicine, textiles, petroleum, chemicals, building materials, and other industrial sectors.
With the emergence and development of modification technology and nanotechnology, modified kaolin and nano-kaolin show more excellent performance, which greatly expand and extend the application field of kaolin.
Kaolin is widely used in the fields of ceramics, papermaking, environmental protection and building materials due to its good performance.
(1) Application in the field of ceramics
Ceramic is one of the most used areas of kaolin. The appropriate amount of kaolin can make the ceramic obtain better stability, whiteness and strength.
(2) Application in the field of papermaking
Kaolin used in papermaking can make the paper get good whiteness, gloss, oil absorption and smoothness properties, is an important papermaking filler.
(3) Application in the field of coatings
Because of the good hydrophilicity, kaolin in water-based coating dispersion is good, can be used to induce thixotropy and improve the anticoagulant, but also can improve the ability to wash, improve Baidu, irregular granular coarse kaolin can reduce the coating gloss.
Due to the low aging rate of calcined kaolin, it can be used as a building exterior wall coating.
(4) Application in the field of fire resistance
The aluminum silicate formed by sintering and dewatering of kaolin at 600-900 ℃ is called metakaolin, which is an important kaolin processing product and is usually used in the field of building materials as a high-performance mineral admixture. Using metakaolin to replace Al2O3 and high alumina cement to prepare refractory castables can improve the flexural strength of refractories, reduce cracks, obtain good refractory performance, and reduce production costs.
Through modification, kaolin can improve its plasticity, fire resistance and specific surface area and other application properties, obtain some new functions, so as to improve its added value, make it adapt to the application requirements of different fields, and obtain better performance in the application.
Modified kaolin is mainly used in the fields of environmental protection, building materials and rubber, and is favored in the current industrial production.
(1) Application in the field of environmental protection
The modified kaolin can obtain a larger specific surface area, enhance its adsorption performance, and make it have better application performance in environmental protection fields such as sewage treatment.
(2) Application in the field of ceramics
The excellent adsorption properties of modified kaolin have also been made into functional ceramics for microbial sterilization, and at the same time, kaolin can be modified to obtain bactericidal properties.
(3) Application in the field of secondary resource utilization
Modified kaolin is also used in the field of secondary resource utilization for the recovery of metal ions.
(4) Application of rubber and building materials
Calcined modified kaolin can enhance insulation, stability and corrosion resistance, and its excellent performance makes it a low-cost and efficient filler. Modified kaolin is also used to improve the application performance of building materials.
Nanoscale kaolin particles have the characteristics of surface effect and small size effect, which make them obtain better and some unique properties in application, and show higher application value, so they become the hot spot of kaolin application research.
Nano-kaolin is mainly used as a filler in cement, rubber and lubricants, and is also used as a nano-reactor and stealth materials.
(1) Application in the field of building materials
Nano-kaolin is used to improve the application performance of cement, nano-kaolin doping makes the mechanical properties and durability of cement are improved, cement mixed with nano-kaolin significantly reduces the permeability coefficient of chloride ions, so that nano-kaolin modified cement can be used in the ocean and melting snow and other harsh environments.
(2) Application in the field of rubber
Adding an appropriate amount of nano-kaolin to the rubber can greatly improve the anti-aging performance and compression fatigue resistance of the rubber, and also improve the safety of production. Nano-kaolin and halogen antimony flame retardant compound for flame retardant low density polyethylene, nano-kaolin instead of 20% Sb2O3 can make the oxidation index and the mechanical properties of the optimal, significantly reduce the amount of Sb2O3, reduce the pollution to the environment, improve safety.
(3) Application in the field of lubrication
Kaolin has a layered structure and small particle size to make it have good lubricity, and the small size effect of nano-kaolin enhances its lubrication performance, so nano-kaolin is also used in lubricants.
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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.