Colloidal Silica for Coatings

July 16, 2020

What is Colloidal Silica?

In simple terms, silica is a product of two natural ingredients, sand and water. Specifically, colloidal silicas are suspensions of fine amorphous, nonporous, and typically spherical silica particles in a liquid phase.

The surface of colloidal silica in contact with water is covered by siloxane bonds (≡Si–O–Si≡) and silanol groups (≡Si–OH).

This makes colloidal silica very hydrophilic and capable of forming numerous hydrogen bonds. Allowing you to meet and stay ahead of regulations while offering your customers benefits such as a more attractive look and smoother surfaces as well as weather resistance and better durability.

Benefits of using Levasil Colloidal Silica in Coatings

  1. Printability
    • Enhances printability by improving surface hydrophilicity, resulting in better retention of waterborne ink.

  2. Frictionizing
    • Interacts to produce a higher coefficient of friction on the treated surface

  3. Dispersing
    • The particles act as a physical spacer, preventing re-agglomeration, and help keep the dispersed material separated by adsorbing on the surface.

  4. Binding
    • At high temperatures, colloidal silica particles sinter and bind components together or form a hard-glassy surface coating.
    • At lower temperatures, the particles can form an inorganic matrix based on chemical bonds.
    • In a polymer resin-based matrix, the surface groups of silane-modified silica particles can react and cross-link with resin groups providing additional binding for the coating system.

  5. Anti-soiling
    • Silica particles in colloidal silica dispersions have many surface hydroxyl-silanol groups, which are very hydrophilic.
    • This means that water forms a film on the surface, allowing dirt to run off with the water.

  6. Anti-blocking
    • Makes surfaces more hydrophilic, causing more moisture to be retained by surfaces during drying, which reduces their tackiness.

  7. Adhesion
    • Improve the molecular interaction of waterborne coatings and adhesives with substrates.

  8. Abrasion & scratch resistance
    • Increases the cross-linking density of reactive groups in organic resins thanks to its high number of hydroxyl surface groups.

What can Maha Offer?

Colloidal Silica is a truly versatile component that expands possibilities for businesses. Looking to incorporate it into your coatings? Contact us at to find out more!

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