Different Effects of 5 Silicate Fillers on Coatings

Source: China Powder Net

#Silicatemineralfiller #Wollastonite #Talcpowder #Micapowder #Kaolinclay #Feldsparpowder #Anyanglishiindustrial

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[Introduction]

Commonly used silicate mineral fillers include talc powder, mica powder, kaolin, feldspar powder, wollastonite, etc. The most basic function of pigments and fillers is to impart a certain color, hiding power, chemical resistance, and mechanical properties to the coating film. Inorganic fillers are also called extender pigments. Since the refractive index is similar to that of film-forming substances, they do not have the coloring power and hiding power of coloring pigments, but they can increase the thickness of the coating film by filling and acting as a skeleton in the coating, making the coating film plump and thick. This also reduces the cost of coating production. the

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In the field of coating application, according to different mineralogy characteristics and basic chemical composition, fillers can be roughly divided into five types: carbonate, silicate, silica, barium sulfate, and aluminum hydroxide. Among them, silicate mineral fillers are widely used in the field of coatings, and their effects and carbonate mineral fillers have their own advantages. Commonly used silicate mineral fillers include talc powder, mica powder, kaolin, feldspar powder, wollastonite, etc.

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Morphology of layered silicate minerals

1. Mica powder:?Mica powder is a silicate containing Al and Mg. After dry or wet grinding, the mica ore becomes a fine powder, removes impurities, is filtered and dried, and becomes a flaky fine powder product. Its appearance is silvery white to gray. Applying this flaky fine powder extender pigment to latex paint can increase the crack resistance of the coating film. Its horizontal arrangement in the coating protects the coating film by blocking UV radiation and also prevents moisture from penetrating. It has good chemical stability, can improve the temperature resistance and weather resistance of the coating film, can play the role of damping, insulation and shock absorption, and can also improve the mechanical strength, powder resistance and durability of the coating film, and can be used for damping Paint, fireproof paint and exterior wall latex paint, etc.

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Basic application index and performance Particle size: 325-500 mesh.

Performance: impart flexibility, water resistance, and weather resistance to the coating film; enhance the chemical resistance, heat resistance, and electrical insulation of the coating.

Reference dosage: 5-10%.

2. Wollastonite:?The chemical composition of wollastonite is calcium silicate, which has a needle-like structure, and can be divided into natural and synthetic products. The natural wollastonite product used in the paint industry is a white powder, which is an alkaline pigment with a pH of 9.9. Natural wollastonite is used as a buffer in vinyl acetate latex paint to prevent the pH from departing from a reasonable alkalinity. Because of its low oil absorption, it is also commonly used in oil-based paints; synthetic wollastonite is mainly used in interior wall flat paints. It has certain opacity, can improve wet abrasion resistance, and has a higher flat effect. the

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Basic application index and performance Particle size: 325~1250 mesh.

Performance: maintain the smoothness and gloss of the coating surface; enhance the mechanical strength, durability, adhesion, corrosion resistance and other properties of the coating.

Reference dosage: 10% to 40%.

3. Kaolin?powder:?Kaolin is also known as hydrated aluminum silicate, china clay, kaolin, and its chemical formula is AL2O3 2SiO2 2H2O. This natural product often contains quartz, feldspar, mica, etc. It is white powder in appearance and soft in texture. Using it in latex paint can improve suspension, prevent pigment from settling, and enhance the hardness of the coating film, but it has greater water absorption. Kaolin can provide the structural viscosity of the coating, which is beneficial for anti-sagging and storage stability, and can also be used to enhance the hiding power of the coating film. In addition, the layered structure filler can also improve the flexural strength and internal stress of the coating film, and prevent the coating from cracking due to bending or expansion deformation of the substrate.

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Basic application index and performance Particle size: 600-1250 mesh.

Basic performance: enhance the light resistance, acid and alkali resistance, and anti-sedimentation of coatings.

Reference dosage: 5%-20%.

4. Talc powder:?Talc powder is a natural product, its molecular formula is 3MgO·4SiO2·H2O, and its appearance is white powder. The particle shape of talcum powder is divided into flake and fiber. For the water resistance and moisture resistance of the coating film, flake talcum powder is better than fibrous talcum powder. Talc powder is not easy to sink in the paint, and can suspend other pigments, and can also prevent the paint from sagging. It can absorb stretching stress in the coating film and avoid cracks and voids. Therefore, talc powder is not only suitable for outdoor paint, but also for In washable, wear-resistant paint.

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Basic application index and performance: Particle size: 325-1250 mesh.

Basic performance: increase paint adhesion, lubricity, corrosion resistance, water resistance, anti-settling.

Reference dosage: 10% to 15%.

5. Feldspar powder: Feldspar powder is a typical framework mineral filler. According to different cations, feldspar powder mainly exists in three forms: Sodium feldspar, Potassium feldspar and Calcium feldspar. Feldspar powder is composed of angular nodular particles. Compared with spherical or common massive fillers, it can form a denser coating film, endow the coating film with high wear resistance and scratch resistance, and improve the anti-corrosion of the coating film. performance.

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Basic application indicators and performance: Particle size: 800 mesh to 1250 mesh.

Basic properties: wear resistance, corrosion resistance.

Reference dosage: 5% to 20%.

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With the continuous development of coating technology, the performance requirements of its components are also getting higher and higher. The use of inorganic fillers is not only used as the supporting framework of the coating film, but more is the research and development of its contribution to the various properties of the coating film. Therefore, the deep processing of fillers by ultra-fine powder technology and powder modification technology will play an important role in the development of coating products for a long time.

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Anyang Lishi Industrial Co., Ltd. is the mine owner and manufacturer of higher quality sodium feldspar from China, for businesses seeking sodium feldspar with higher aluminum and sodium content, partnering with a trusted manufacturer is essential.

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Compared with other suppliers, our product is higher Na and Al content, with lower Si and Fe content, which ensures vibrant colors and high transparency, also a fast burning at a lower temperature to save the production cost, this finely ground powder is ideal for coating, pigments, ceramic glaze, and porcelain applications.

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We are recommended manufacturer's commitment to quality, advanced mining and processing techniques, stringent quality control, industry expertise, and customization options make you a reliable choice.

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Reference source: Ji Xinghong, et al.: Application and Research Progress of Inorganic Fillers in Coatings Industry, Jotun Coatings (Zhangjiagang) Co., Ltd. Shen Hao, et al.: Basic Knowledge and Basic Skills in Coatings Industry (40)-Fillers, HowNet Coatings, Tsinghua University patent

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Source: China Powder Net

Translated by: Eloisa Fong