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Yuan Lei Small Classroom | Kaolin-Interpretation Series of Characteristics and Uses

Release time:

2024-01-29 09:37

 

Yuan Lei Small Classroom | Kaolin-Interpretation Series of Characteristics and Uses

 

KaolinIt is a clay or claystone dominated by kaolinite group minerals.

Main ingredients

KaolinAKA:Baiyun soil, Guanyin soil, pavilion soil powder, pottery clay.

 

The mineral composition of kaolin is mainly composedKaolinite (Al4[Sighs]4O10](OH)8, halloysite (Al4[Sighs]4O10](OH)8·4H2O), hydromica, illite, montmorillonite (NaX(H2O)4{(Al2[AlxYou are.4-xO10](OH)2})And quartz, feldspar and other mineral composition;Mineral composition is kaolinite, content of more than 90%.

 

 

 

Physical Properties

kaolinThe color is white, or close to white, the highest whiteness can reach more than 95%The color of kaolin varies slightly with the metal content or organic matter content,Rose red, brown yellow when containing Fe2o3; containing Fe2 is light blue, light green; containing Mno2 is light brown; containing organic matter is light yellow, cyan, gray, black and so on.Kaolin is mostly cryptic dense or earthy aggregates. Hardness 2.0~3.5, specific gravity 2.60~2.63, melting point 1780 ℃, good insulation, low plasticity.

 

development and application

Kaolin is mainly used to makeHousehold ceramics, industrial ceramics, building and sanitary ceramics and refractory materials, also used as fillers or white pigments for paper, construction, coatings, rubber, plastics, textiles, etc..

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Kaolin as paper filler

paper industryThe international market of kaolin is relatively prosperous, and its sales volume exceeds that of ceramics, rubber, paint, plastics, refractory materials and other industries. In pulp, kaolin usually reacts less with its ingredients and hasStrong stability, can be well retained in the paper fiber. At the same time, kaolinFine particle size, strong fluidity, mechanized production can ensure uniform paper coating thicknessKaolin can fill the gaps between paper fibers, increase paper density, reduce paper transparency, improve paper flatness, and enhance the ability of paper to absorb ink.

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Kaolin as a filler for ceramics

ceramic industryThe application of kaolin is earlier than other industries, and the dosage is also very large,Usually can account for 20% to 30% of the formula. Kaolin can make ceramics in Al2O3The content of mullite increases, and the generation process of mullite is easier to carry out, thus.Improved ceramic stability and sintering strength. In ceramic firing, the decomposition of kaolin into mullite is the process of forming the frame of the body, which can widen the firing temperature range, the ceramic body is not easy to be out of shape and deformed, andImprove the whiteness of ceramics. At the same time, kaolin itself also has the characteristics of adhesion, plasticity, binding, suspension and so on, which can improve the formability of porcelain clay enamel, and is more conducive to the processing of car blank, grouting, ceramic forming and so on.


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Kaolin for rubber filler

rubber industry,kaolin filling into the colloidal mixture, canEnhance the wear resistance, chemical stability and mechanical strength of rubber, and extend its hardening timeIt can also adjust the mixing, rheology and vulcanization of rubber, improve the viscosity of unvulcanized products, and prevent them from collapsing, sagging, sagging, flat tubes, deformation, etc. The permeability, water resistance, chemical activity, fire resistance and other characteristics of rubber products have also been greatly improved. At the same time, kaolin as a filler can also reduce the amount of other raw materials in the rubber, greatly reducing the production cost of rubber without significantly affecting the performance of rubber.


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Kaolin for plastic filler

plastics industry,Kaolin as a plastic filler, canMake plastic products appearance flat, accurate size, resistance to chemical corrosion, reduce thermal shrinkage and thermal fissionIt is conducive to the polishing process.


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Kaolin used in coating industry

coating industry,Because of its white color, low price, good fluidity, stable chemical properties and large surface cation exchange, kaolin has long been used as a filler for coatings and paints. Kaolin used for coatings is generally washed ultrafine kaolin and calcined ultrafine kaolin. Which calcined kaolin is just developed in recent years, as a new functional additive,It has good whiteness, coverage, softness, abrasion resistance, opacity, non-shrinkage, etc., and maintains good color and stability of the coating in high polymers.. Kaolin itself is white, used as an additive and no coverage, but if the right amount is added to the white paint or paint, it can play a role in enhancing gloss and improving its covering ability.


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kaolin crucible

refractory material,High whiteness, fine powder degree, good suspension of kaolinMainly used in the production of refractory materials, semi-acidic refractory materials and special refractory materials (such as melting, optical glass, control glass fiber crucible can replace platinum crucible).


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Kaolin used in agriculture

Agriculture,Kaolin is diluted and coated on plants to prevent and reduce pests and diseases. Apples, pears and other fruit treesSpraying kaolin solution can reduce the heat radiation of strong sunlight on the tree body in summer, reduce water evaporation and improve fruit yield.Kaolin used for pesticides can reduce the amount of drugs, extend the time of insecticidal, reduce costs, and can greatly reduce pesticide residues.


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Kaolin used in construction industry

 

Kaolin for textile whitening

 

Other industries,In recent years, with the progress of science and technology, kaolinConstruction, textile, wire and cable, ink, food, medicine, petroleum refiningindustry has been widely used.

 

Interpretation, kaolin, rubber, for, ceramics, paper, fillers, coatings, as, refractory materials

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