►What is Powder Coating?

Why Use Powder Coating?

Reducing Solvent Pollution

Improved Film Formation Efficiency

Problems in Powder Coatings - Susceptibility to Caking

►Anti-Caking Agent- Fumed Metal Oxides

What are Fumed Metal Oxides?

The technology for producing fumed metal oxides via flame hydrolysis was initially developed for manufacturing silica. Through continued research and experimentation, this process was later extended to the production of other metal oxides, leading to a variety of unexpected applications.

By externally adding additives with large specific surface areas and strong moisture absorption, such as HJSIL® fumed silica and HJXIDE® fumed alumina, powder coating particles can form a barrier. This reduces the chances of particle collision and agglomeration, minimizes mutual attraction and friction between particles, and prevents direct contact between them, making powder coatings less prone to caking.

Fumed metal oxide process

Gaseous metal chlorides are introduced into an oxyhydrogen flame, where high-temperature hydrolysis generates fumed oxides. These products are characterized by high chemical purity and large specific surface areas, with particle size and morphology precisely controllable during production.

Fumed metal oxides have become key materials across various industries. Today, fumed alumina and titanium dioxide play a vital role in improving the safety, performance, and lifespan of lithium-ion batteries for electric vehicles, thus advancing global green mobility.

HJSIL® fumed silica

• HJSIL Fumed silica has a specific surface area of 90–400 m²/g

• produced from silicon tetrachloride, oxygen, and hydrogen via high-temperature reactions
  
  
  
  
  
  
  
   

HJXIDE® fumed alumina

• with a specific surface area of 80–120 m²/g

• produced using aluminum chloride, oxygen, and hydrogen

• Aluminum chloride is sublimated and burned in a hydrogen-oxygen flame, followed by high-temperature hydrolysis
  
  
  
  
   

Both materials have a primary particle size range of 7–40 nm and an agglomerated particle size of 4–6 µm.

Applications of Fumed Silica

• Adhesives & Sealants

• Silicone Rubber

• Paints & Coatings

• Caulking Compound

• Lubricating Grease

• Construction Industry

• Liquid Silicone Rubber

• FRP Composites

• Fertilizer

• Animal Feed

• Pharmaceuticals

• Cosmetics

• Food

• Battery

• Printing Ink

• Thermal Insulation Materials

Applications of Fumed Alumina

• Powder coatings

• Lighting equipment

• Electronic products

• Photocatalysis

• Lithium batteries

Finally, to mitigate caking in powder coatings, it is essential to

• control storage conditions by maintaining a dry, low-humidity environment and avoiding high temperatures.
• improving packaging with moisture-resistant materials or vacuum-sealed options
• optimizing formulations by reducing low-melting components
• incorporating anti-caking agents like precipitated silica

Additionally, minimizing mechanical pressure during transportation and storage is crucial. Implementing these measures can significantly reduce the risk of caking, ensuring the quality and performance of powder coatings during application.