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Different applications and specifications of washed kaolin and calcined kaolin

2024-01-24

Kaolin is a kind of non-metallic mineral. It is a kind of clay and clay rock dominated by kaolinite group clay minerals. Because of its white and delicate, also known as dolomite. It is named after Gaoling Village, Jingdezhen, Jiangxi Province.

Its pure kaolin is white, delicate, soft soil, with good plasticity and fire resistance and other physical and chemical properties. Its mineral composition is mainly composed of kaolinite, Eloite, hydromica, illite, montmorillonite, quartz, feldspar and other minerals.

Kaolin is divided into washed kaolin and calcined kaolin.

Difference between washed kaolin and calcined kaolin:

Firstly, the calcined kaolin is calcined, and the crystal type and original soil have changed. However, washing kaolin is only a physical treatment, which will not change the properties of the original soil.

Secondly, the difference in whiteness is relatively large, and the whiteness of kaolin will increase after light burning, while washing will not significantly increase the whiteness.

Third, different uses. Depending on the calcination temperature, kaolin can be used as a papermaking additive and refractory aggregate. The washed kaolin is generally used as papermaking filler.

At present, calcined kaolin mainly refers to hard kaolin (coal measures kaolin), the original soil is not adhesive, can not be directly used as raw materials for papermaking or refractory materials, need to be calcined after application; The original soil of washed kaolin has adhesive property and can be directly used as refractory binder or papermaking filler.

As far as paper fillers are concerned, the whiteness of calcined kaolin is much better, and the cost is relatively high.

Calcination will also lead to the increase of kaolin particle size, although the specific surface area is reduced, the adsorption is reduced, but the surface energy is reduced, so that the dispersion of kaolin is improved, and the structure is loose because of the non-normalization, which can also improve the dispersion. Calcined and dehydroxylated kaolin is usually refined by grinding or chemical surface modification as a reinforcing filler for rubber, plastics, etc., to partially replace white smoke.

Product use:

1. Washed kaolin has become a necessary mineral raw material for paper making, ceramics, chemicals, glue, adhesives, national defense and other industries;

Ceramic industry is the earliest application of kaolin, a large amount of industry. The general dosage is 20% ~ 30% of the formula. The role of kaolin in ceramics is to introduce Al2O3, which is conducive to the generation of mullite, improve its chemical stability and sintering strength, and decompose kaolin into mullite in the firing, forming the main frame of the strength of the billet, which can prevent the deformation of the product, make the firing temperature wider, and also make the billet have a certain whiteness. At the same time, kaolin has a certain plasticity, adhesion, suspension and bonding ability, giving porcelain mud, porcelain glaze good formability, so that ceramic mud is conducive to turning and grouting, easy to form.

2. Calcined kaolin is widely used in ceramics, rubber, plastics, coatings, artificial leather, self-cement, refractory materials, cosmetics and so on. With the further improvement of mineral processing technology, kaolin will be widely used. The coal geological system preparation unit can proceed from the actual situation and base on the kaolin resources and market demand in the coal measure strata. Kaolin is a common non-metallic mineral in nature, which was used in the past to produce ceramics, refractory materials and a small amount of additives in plastics and rubber.

Calcined kaolin has the characteristics of high whiteness, strong hiding power, good fluidity, high oil absorption and good suspension in coatings. The properties of the coating and coating film obtained by adding this fine calcined kaolin to the latex paint will make us feel that kaolin is not only a common filler, it can become a functional filler to improve the quality of the coating.

Calcined kaolin in rubber and special cable reinforcing agent, industrial plastic functional filler, ink filler.

Calcined kaolin can be used in paper coating to replace part of the expensive titanium dioxide.

Yuan Lei's Little Knowledge | Ten Major Uses of Barium Sulfate

2024-01-11

Guangdong Yuanlei Powder Co., Ltd. was founded in 2005 and is located in Shunde, the central jurisdiction of the Guangdong Hong Kong Macao Greater Bay Area; Located near Hong Kong and Macau, it is a blessed place that connects with the international community and radiates to the mainland. Yuanlei Powder is a modern enterprise that owns its own mines, operates its own production, and integrates independent marketing. A modern chemical plant with research and development capabilities has been built with huge investment in Jiangmen, Guangdong, known as the "Top 100 Township Enterprises". The sales network of Yuanlei powder is spread throughout South China, Central China, East China, Southwest and other regions.

Barium sulfate is mainly made from barite and processed through processes such as ore dressing, washing, and crushing. The hardness of barium sulfate is 3-3.5 (Mohs), with 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, but 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.

At present, barium sulfate is widely used and the industries with high demand include the following:

1. The application of barium sulfate in paint is superior to most other filling powders, with characteristics such as low cohesion, low light dispersibility, and fine particles. It is particularly suitable for pigment topcoats, varnish, spray paint, etc., and has chemical and weather resistance. It is inert, insoluble in organic mediators such as water, acid, and alkali, and its excellent glossiness and particle fineness enable the topcoat to be maintained during long-term exposure. Barium sulfate is recommended for topcoats to increase surface hardness and color stability.

Barium sulfate has high filling properties and can be applied to all coating series, such as primers, thick paste coatings, and other types. Its low specific surface area, particle size distribution, and easy flowability make barium sulfate have low wear during processing. Barium sulfate is recommended for automatic primer surface layers and even maintains good uniformity and smoothness during high filling.

2. Barium sulfate is used in latex paint and is known as "acid resistant" latex paint. Even when exposed, it has acid resistance. The dispersibility, optical rotation retention, and flowability of barium sulfate can enhance its chemical properties.

3. Barium sulfate used in powder coatings can improve their gloss, fluidity, filling properties, and compatibility with various pigments.

4. In the application of pigments, barium sulfate is used as a spacer for titanium dioxide and pigments in plastics, which can reduce the amount of pigment added and save about 10% of cost. Light reflection can maintain the complete color of the pigment.

5. The titanium dioxide or pigment particles in coatings are usually not completely dispersed, and the particles will aggregate together, causing a decrease in scattering rate and covering power, making these titanium dioxide agglomerates a great waste. The average particle size of MICROBARI submicron barium sulfate is around 1.3um, which is approximately equal to titanium dioxide particles (with an average particle size of 0.3) μ About twice the size of m, the addition of MICROBARI submicron barium sulfate can separate the agglomerated titanium dioxide particles. Each submicron barium sulfate particle has sufficient surface energy and can adsorb 4-10 titanium dioxide particles around it, effectively achieving spatial segregation and maximizing the scattering rate of each titanium dioxide particle. Applying MICROBARI submicron barium sulfate as a physical pigment to high-end products such as thin spray powder coatings, electrophoretic coatings, and high gloss coatings can give your products a competitive advantage in technology and price.

6. Barium sulfate, as a filler in silicone rubber and mixed rubber, can increase the hardness of silicone rubber and reduce its elasticity.

7. In the application of printing ink, barium sulfate's low wear resistance, high glossiness, color stability, low cohesion, and combined with its easy flowability make it suitable for high-quality printing ink.

8. Barium sulfate is used in the production of paper coatings, and its introduction can increase its glossiness and fluidity, such as art paper and medium white transparent colored paper. The titanium dioxide part can be replaced by double barium sulfate without losing its glossiness.

9. Barium sulfate is particularly suitable for elastomers, as it does not contain any heavy metal pollution or rubber gas, making it particularly suitable for food and medicine, and can provide its stability and anti-aging properties.

10. In the application of thermoplastic materials, the thermal c

Yuan Lei's Little Knowledge | Summary of Classification and Application of Talc Powder

2024-01-08

Composition and characteristics of talc powder

The main component of talc is hydrated magnesium silicate, belonging to the monoclinic system. Crystals are in the form of pseudo hexagonal or rhombic flakes. Ores usually form dense clumps, leaf like, radial, and fibrous aggregates. Colorless transparent or white, but appearing light green, light yellow, light brown, light red, or even black due to the presence of small amounts of impurities; The cleavage surface has a pearl luster. Soft in texture, with a Mohs hardness of 1-1.5 and a specific gravity of 2.7-2.8.

Talcum powder is a white powder made by processing and refining talcum blocks through multiple processes such as screening, cleaning, drying, batching, grinding, grading, and packaging. It has a smooth feeling and excellent physical and chemical properties such as obvious lubrication, fire resistance, acid resistance, insulation, high melting point, inactive chemical properties, and strong adhesion. Talc powder is classified differently based on its composition, origin, and color. Due to its inherent excellent qualities, it is widely used in industries such as coatings, paints, plastics, papermaking, ceramics, cosmetics, pharmaceuticals, food, and daily necessities.

Classification and uses of talc powder

1. Chemical grade talc powder

Usage: Mainly used in the chemical industry such as rubber, plastics, paint, coatings, etc. as a modifier filler. Features: Increase the stability of product shape, increase adhesion, filling, covering power, sanding, increase tensile strength, shear strength, bending strength, pressure strength, reduce deformation, elongation, thermal expansion coefficient, etc., with high whiteness, uniform particle size, and good dispersibility.

2. Ceramic grade talc powder

Usage: Used for manufacturing high-frequency ceramics, wireless ceramics, various industrial ceramics, architectural ceramics, daily ceramics, and ceramic glazes. Features: High temperature non discoloration, enhanced whiteness after forging, uniform density, good gloss, and smooth surface.

3. Cosmetic grade talcum powder

Usage: It is a high-quality filler in the cosmetics industry. Features: Contains a large amount of silicon element. It has the function of blocking infrared rays, thus enhancing the sun protection and anti infrared performance of cosmetics. At the same time, talc powder is smooth and has a pearl luster, which has a certain protective and beauty effect on the skin. It is easy to clean, non-toxic, and harmless.

4. Medical and food grade talc powder

Usage: Used as an additive in the pharmaceutical and food industries. Features: It is non-toxic, odorless, with high whiteness, good compatibility, good glossiness, soft taste, and strong smoothness. A pH value of 7-9 does not alter or degrade the physical properties of the original product. It is a high-quality and stable filling additive in the food and pharmaceutical industry.

5. Paper grade talc powder

Usage: Used as a filling material for various high-grade and low-grade paper industry products. Features: Paper grade talc powder has the characteristics of high whiteness, stable particle size, and low wear. The paper made with talcum powder can achieve characteristics such as smooth surface, delicacy, high gloss, good toughness, and strong moisture absorption. Adding it to the formula can save atomic materials and improve the service life of the lipid network.

6. Other uses of talc powder

The performance of talc powder determines its wide range of applications. In addition to the above-mentioned purposes, it can also be used for production isolation of wires and cables, demolding of molds, moisture absorption and lubrication in daily life, sports, and casting marking. The main utilization is the properties of talc powder, such as smoothness, softness, dryness, and high temperature resistance.

Can silica fume really replace titanium dioxide in latex paint?

Can silica fume really replace titanium dioxide in latex paint?

2024-01-04

Can silica fume really replace titanium dioxide in latex paint?

Wollastonite powder is used in latex paint, which saves a lot of titanium dioxide and reduces costs without compromising the performance of the latex paint. The advantage of the present invention lies in the direct use of untreated wollastonite powder in latex paint by selecting dispersants, thereby avoiding pre-treatment of wollastonite powder and greatly reducing coating costs. Replacing 30% titanium dioxide with 320 mesh wollastonite powder can reduce the cost of latex paint within the range of 130 to 200 yuan (RMB)/ton.

After being crushed to a certain particle size, silica fume can replace some titanium dioxide in coatings. Its main disadvantage is that the coating is unstable and prone to precipitation.

The present invention involves crushing natural wollastonite and directly using it without chemical pretreatment to replace 10-40% titanium dioxide in latex paint. By adding a mixture of dispersants such as polyacrylate and sodium hexametaphosphate, the stability of this type of latex paint is ensured and the cost is reduced. The weather resistance of latex paint has been improved, while other properties remain unchanged.

In the application of exterior wall latex paint, silica fume has a high hardness, a Mohs hardness of 4.5-5, a low coefficient of thermal expansion, and is an inert filler with good weather resistance. Its needle like structure has crack resistance, high whiteness, and good coloring power. When color is adjusted, the color brightness is high. As an important filler, it is increasingly used in exterior wall coatings.

The application of wollastonite in interior wall latex paint used to be limited due to its yellowish hue. However, with the advancement of deep processing technology in wollastonite production enterprises, the whiteness can reach over 90. For example, the highest whiteness of wollastonite JLH6W from Shenzhen Jinhaohui Chemical can reach 92. It can be fully used in interior wall coatings.

The needle like structure of wollastonite can increase the porosity of high PVC interior latex paint, thereby improving its covering power. The needle like structure of wollastonite can help improve its scrub resistance. Data shows that adding 5-8% wollastonite to interior latex paint can improve its scrub resistance by 100 times. In addition, the needle like structure of silica fume can reduce corner light, improve compressive light resistance, and improve construction performance.

Yuan Lei's Little Knowledge | Summary of the Application and Common Problems of Kaolin in Rubber and Plastic Materials

2024-01-02

Application of Kaolin in Rubber and Plastics

1、 Introduction to Kaolin

Kaolin (clay) is an important non-metallic mineral, and is one of the four major non-metallic minerals along with mica, quartz, and calcium carbonate. Kaolin is mainly composed of small, sheet-like, tubular, and laminated kaolinite cluster minerals (kaolinite, dickite, perlite, halloysite, etc.) smaller than 2 microns. The ideal chemical formula is AL2O3-2SiO2-2H2O, and its main mineral components are kaolinite and polyhydrate kaolinite. The chemical composition of kaolin contains a large amount of Al2O3, SiO2, a small amount of Fe2O3, TiO2, as well as trace amounts of K2O, Na2O, CaO, MgO, etc.

2、 Physical and chemical properties of kaolin

The Mohs hardness of kaolin is 1-2, and some minerals can reach 3-4. The specific gravity is 2.58-2.60, and the fire resistance is 1770-1790 ℃. Pure kaolin has high whiteness, soft texture, easy dispersion, good suspension, good plasticity and high adhesion, and excellent electrical insulation performance; It has good acid solubility, low cation exchange capacity, good fire resistance and other physical and chemical properties. Therefore, kaolin has become an essential mineral raw material for dozens of industries such as papermaking, ceramics, rubber, chemical industry, coatings, medicine, and national defense. The percentage content and various properties of silica and alumina in the calcined kaolin are much better than those of natural kaolin.

3、 Application of Kaolin in Rubber and Plastics

1. Application of kaolin in plastics

It can increase the glass transition temperature, tensile strength and modulus, as well as insulation performance. Kaolin acts as a nucleating agent in polypropylene, which can improve its rigidity and strength; It can play a role in blocking infrared radiation in plastic films (such as PE); Adding 5-8 parts of modified calcined kaolin to the plastic sheath material of PVC high-voltage cables can improve the volume resistivity of the cables; At the same time, kaolin also has an anti settling effect. In the past, antimony trioxide powder was generally used as a flame retardant in the production of flame-retardant copper-clad panels. Due to the high density of antimony trioxide, it is easy to settle in the adhesive material. Therefore, adding a certain amount of kaolin can prevent settling, and it can also partially replace antimony trioxide. After adding a certain proportion of kaolin, the flame-retardant white quenching time of copper-clad panels reaches Fvl level, It partially replaces and reduces the cost of flame retardants.

2. Application of Kaolin in Rubber

The use of kaolin fine powder instead of light calcium in the production of rubber pipes can meet the main technical indicators such as tensile strength, elongation at break, permanent deformation at break, and Shore A-type strength, all of which meet the relevant standard requirements. Meanwhile, as the particle size of kaolin fine powder decreases, its reinforcement improves and its performance is superior to that of light calcium. Adding kaolin to the rubber material makes it easy to mix and is also conducive to the dispersion of carbon black in the rubber material. The surface of the rubber material also appears smooth and soft, and the finished product surface is delicate and smooth.

4、 Summary of common problems with kaolin

1. Kaolin can be used together with antimony trioxide to achieve synergistic flame retardancy. What is the role of kaolin?

Answer: Firstly, the synergistic use of kaolin and antimony trioxide is mainly to maintain the original quality inspection foundation, add kaolin, and reduce costs. Secondly, the composition and properties (neutral) of kaolin determine the synergistic flame retardant effect, and the effect of antimony trioxide remains unchanged.

Secondly, kaolin is composed of silicon dioxide and aluminum trioxide, and its structure and stability are close to inert. It does not react with any acid or alkali, and its pH value is neutral. Kaolin itself has a flame retardant effect, but its effect is not as obvious, so it is only a synergistic flame retardant. In fact, antimony trioxide plays the most important role, while kaolin plays a cost reducing role, and the effect remains unchanged.

2. The customer produces rubber using kaolin currently available in the market, but the resulting product has yellowing. However, without adding kaolin, this problem does not exist. What is the situation? Do we have any suitable product recommendations?

Answer: The scope of action of kaolin is very broad, and whether it undergoes yellowing depends on the type and design formula of the gel, as well as the amount of kaolin added. Because Jinyang is calcined at normal temperature, its compatibility with some gel types is not good. The main yellowing is not the yellowing of kaolin itself, but rather the stabilization of kaolin, affecting the original system and even the function of some

Yuan Lei's Little Knowledge | Classification, Use, and Precautions of Transparent Powder

2023-12-27

Overview of Transparent Powder Applications

Transparent powder is a common name in the paint industry. Due to its excellent transparency, good appearance, and better filling ability, it is commonly known as "transparent powder" in order to highlight its main characteristics in the first time and first impression. In fact, transparent powder is not a single powder. In addition to its main component being natural minerals, it is also made by mixing, grinding, and modifying with specialized synthetic auxiliary materials. The main components are composite silicates containing magnesium, aluminum, and calcium, which belong to inorganic salts. In addition, it contains some sulfates and impurities. Transparent powder is a new type of functional transparent filling material, which has the characteristics of high transparency, good hardness, excellent color, high gloss, good collapse resistance, and less dust during use. Widely used in oil-based furniture paint, decoration paint, adhesives, inks, and plastics.

1、 Transparent powder classification

1. Containing crystalline water

The molecular structure of this product contains chemical water, with a volatile content of generally 15% -20%. The amount of volatile content depends on the crystal rock itself and also on the control of the production process. Generally speaking, varieties with high volatile matter have relatively high transparency, which concerns many technicians whether volatile matter will affect the use and effectiveness of coatings? In fact, what truly affects the quality of coatings is the physical moisture of transparent powder, that is, the surface water. Physical moisture will participate in some direct or indirect reactions, affecting the use and performance of coatings. Most transparent powder production enterprises control its physical moisture below 0.5%, which maintains other product properties such as dispersibility, anti fog, dryness, side effects, etc. while ensuring its transparency.

However, transparent powder containing crystalline water can easily absorb moisture and cause agglomeration if not handled properly during use. It is necessary to use grinding pressure to achieve normal dispersion effect. In response to this, production enterprises are also constantly improving, and the occurrence of this phenomenon is also decreasing. Another point is that although transparent powder has good transparency, it also has a certain blue light phenomenon like gas-phase silica. If applied too thick or used too much at once on some dark substrates, it is easy to cause fogging and whitening due to the blue light phenomenon. This is also a phenomenon that some technical personnel in enterprises do not want to see, so it is also limited in use.

2. Not containing crystalline water

Its main component is silicon dioxide, with a content of over 90%. It is a processed mixed powder of natural crystalline quartz. Its whiteness is mostly lower than that of varieties containing crystalline water, and its transparency is excellent, especially in polyurethane systems. It has the characteristics of high temperature resistance, weather resistance, acid and alkali resistance, and high insulation.

Its characteristic is that the finished coating product does not produce blue light, has good repainting performance, overcomes the drawbacks of varieties containing crystalline water, but its color and polishing performance are slightly worse than those containing crystalline water, while its stability and storage performance are superior. Varieties without crystal water have relatively high hardness, making it difficult for production enterprises to produce and increasing electricity consumption. Therefore, their comprehensive cost is higher than that of varieties with crystal water. In addition, during the processing, the amount of dust and noise generated is higher than that of varieties with crystal water. Various defects also limit their application, only in some special or relatively high requirements, Used in formulas with minimal cost constraints, it can demonstrate performance that is different from ordinary ones!

2、 Application of transparent powder

1. Wood paint: It can be applied to PU, PE, NC transparent wood paint primers and UV curable paints to increase transparency, oiliness, hardness, and improve collapse resistance. It can also be used in solid color primers such as water-based wood paint and oil-based white paint to improve film gloss and oxidation resistance, and increase paint fluidity.

2. Oil based adhesive: can be applied in adhesives to improve physical and chemical properties such as solid content, adhesion, hardness, and dryness

3. Artificial stone: In stone, it can improve its transparency, glossiness, hardness, and reduce overall costs.

4. Plastic filling materials: improve the hardness, fire resistance, acid and alkali resistance, electrical insulation, dimensional stability, creep resistance, crack resistance, high tra

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Different applications and specifications of washed kaolin and calcined kaolin

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Can silica fume really replace titanium dioxide in latex paint?

Yuan Lei's Little Knowledge | Summary of the Application and Common Problems of Kaolin in Rubber and Plastic Materials

Yuan Lei's Little Knowledge | Classification, Use, and Precautions of Transparent Powder