Matting Agent – Sol Gel Silica
Matting agents are used to reduce the gloss in a variety of coatings applications. The application segments for silica based matting agents include coil coatings, industrial wood coatings, general industrial and automotive coatings as well as printing inks, leather/textile coatings and decorative coatings. Coil, wood and furniture coatings are the applications with the largest volumes but radiation-cured coatings and other coating systems as well as printing inks also employ silica.
The solvent borne paint sector has been more important for silica than waterborne coatings. However, the pressure to reduce VOC emissions and formulate solvent-free paints has led to the development of grades of silica that are suitable for formulation in powder, ultraviolet and waterborne coatings.
Efficiency of the matting agent depends on the type of silica, particle size distribution and porosity of the particle. A high porosity is a key feature of a modern matting agent as it enables the formulator to limit the addition rate of a matting agent in a formulation. Unfavorable viscosity effects as well as limitations in surface properties of the coating can be avoided.
Without Surface Treated : FMSIL 412
With Surface Treated : FMSIL 412 Plus
Sol gel silica is manufactured using hydrolysis process in which particle size of silica can be control by maintaining the reaction temperature or pressure.
KEY BENEFITS :
- Good Matting Effect.
- Narrow Particle Size Distribution.
- No Melting Point (thermoset).
- Temperature Resistant up to 200 °C.
- Highly Transparent in Film.
- High Scratch Resistance.
- High Resistance to Polishing.
- Shear Resistant.
- Chemical Resistant.
- No Swelling in Normal Coatings.
- No Adverse Effects on Catalysts.
- Little Influence on Viscosity/Rheology.
- Good Gloss Retention in All Weather.
- Good incorporation and dispersion properties; outstanding rigidity; high purity; controlled particle size.
The application segments for sol gel silica matting agents include coil coatings, industrial wood coatings, general industrial and automotive coatings as well as printing inks, leather/textile coatings and decorative coatings. Suppliers also offer organically treated sol gel silica for use as matting agents. These products are recommended for use in clear varnishes because they have somewhat better anti-settling, dispersion and mar-resistance properties in comparison with untreated grades.