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.
Matting Agent – Fumed Silica
Without Surface Treated : FMSIL 200, FMSIL R202, FMSIL M 5, FMSIL R 812
With Surface Treated : FMSIL 200 PLUS, FMSIL R 900,FMSIL R972 T,FMSIL R974T
Fumed silica is manufactured via a dry process of combustion hydrolysis in the gas state. The primary particles consist of nano-size flakes. Fumed silica, structurally, has no gap among particles and is weakly agglomerated together with minimal internal surface area. Fumed silica is traditionally utilized for rheological purposes. The Rheology control function includes thickening (bodying), Thixotropy, Anti-sag, Hold out, Edge coverage and Pattern control in metallic finishes. The coating uniformity is improved by preventing the pigment stratification during the curing, even at high temperatures.
KEY BENEFITS :
- Reinforcement – Improving strength in silicones and other polymers.
- Rheology Control.
- Thickening – Tailored flow properties.
- Sag Resistance – Reduced sag of liquids and pastes.
- Anti-Settling – Prevents sedimentation and settling.
- Thixotropy – Shear thinning viscosity profiles.
Paint, Coatings and Inks : for rheology control and free flow in powder coatings.
Adhesives : for rheology control.
Caulks and Sealants : for rheology control and reinforcement.
Composites : for rheology control.
Elastomers : for reinforcement.
Food : for free flow and anti-caking.
Personal Care : for free flow in powders, rheology control in pastes and liquids and reinforcement.
Pharmaceutical : for free flow and reinforcement in tablets.