Product Introduction
Fumed silica is an extremely fine nano-scale amorphous silica obtained by condensing halosilanes in a hydrogen-oxygen flame at high temperature. Fumed silica is classified into hydrophilic and hydrophobic types based on surface treatment.
Fumed silica features small particle size, large specific surface area and high surface activity. It possesses superior properties such as thickening, thixotropy, anti-sedimentation and anti-sagging, and is widely used in industries like silicone rubber, adhesives, coatings, inks and thermal insulation.
Application
Printing inks
In offset printing inks, the use of hydrophilic fumed silica can accelerate the drying speed of the ink, reduce the occurrence of ink soiling and blurring.
In gravure printing, aniline printing and silk printing, the use of fumed silica can adjust viscosity and prevent pigment sedimentation.
It can be used as a dispersant and flow control agent in the color adjustment of ink cartridges in copiers and laser printers.
Paint/Coating
Fumed silica is added to painting and coatings for rheological control. It can effectively prevent sedimentation and delamination of pigments, improve the weather ability and scratch resistance of coatings, and improve the bonding strength between coatings and substrates.
Silicone rubber
The silanol groups (Si-OH) on the surface of fumed silica can form physical or chemical bonds with the macromolecules of silicone rubber, creating an adsorption layer of silicone rubber molecules on the surface of silica.
This constitutes a three-dimensional network structure where silica particles and silicone rubber molecules are integrated, effectively restricting the deformation of the silicone rubber molecular chain and thereby achieving a reinforcing effect.
Adhesive/Sealant
Fumed silica is the preferred material for modifying adhesives and sealants. Adding fumed silica to silicone sealants and adhesives can significantly increase the bonding strength, ensure free flow, and has the functions of preventing caking, sagging, collapse, and depression during curing, maintaining transparency, reinforcing, and resisting shear.
Unsaturated Resin
Adding a small amount of fumed silica to unsaturated resins can endow the resins with excellent transparency and outstanding physical properties, thereby enhancing the quality of downstream products.
In Gelcoat resin，the addition of fumed silica can enhance their thixotropy, endowing the resins with excellent tensile strength, bending resistance, water resistance, heat resistance and other properties, thereby extending their service life.
Thermal insulation/Heat insulation materials
Due to its small primary particle size, high porosity and good thermal stability, fumed silica can exhibit extremely low thermal conductivity and excellent heat insulation effect when used in thermal insulation materials.
