Application in feed
Fumed silica has strong adsorption and moisture absorption properties due to its small particle size, large specific surface area and unique three-dimensional network structure. In the feed industry, mineral premixes, vitamin premixes and other powdered additives cannot flow fully and freely. Adding fumed silica is mainly used as a flow aid, which can significantly reduce the tendency of feed agglomeration and improve the flow performance, and improve the feed Production and transportation efficiency, and prevent the product quality from being affected by moisture.
Application in fertilizer
In the process of transportation and storage of fertilizers, agglomeration is often caused by factors such as temperature changes, increased humidity, and extrusion, which affects the efficiency of fertilizers in the transportation process and the quality of products. Adding fumed silica to chemical fertilizers can take advantage of its strong adsorption and moisture absorption to play a role of anti-caking, thereby promoting the free flow of fertilizer powder, facilitating the transportation and storage of chemical fertilizers, and preventing them from being damp.
Application in pesticides
Fumed silica has a large specific surface area, strong adsorption performance, and is easy to suspend. It can absorb a large number of water molecules in water and swell into very fine particles to form a stable suspension. Therefore, it is particularly suitable for use as a carrier for pesticide wettable powders, granules, water dispersible granules, and as a dispersant and thickener for suspending agents. At the same time, fumed silica has good affinity and chemical stability, even in Under rain, washing and hot conditions, it can still remain unchanged for a long time, so as to ensure the long-lasting effectiveness of pesticides.
Application in medicine
Fumed silica has a small particle size, a large specific surface area, a porous structure and unique physical and chemical properties, which enable it to have strong adsorption capacity and high biological and chemical stability. Adding fumed silica to drugs can make full use of these properties as anti-caking agents, drug carriers and excipients for drugs, so as to achieve the purpose of prolonging the drug effect.
Application in cosmetics
Fumed silica is mainly used as a dustproof agent in nail polish; as a thickening and thixotropic agent in face cream, it also has the function of reflecting ultraviolet rays.
Application of gel battery
Fumed silica is a white and odorless ultrafine powder material, which has the functions of thickening, anti-caking, controlling system rheology and thixotropy. In addition to traditional applications, it has been widely used in colloidal batteries in recent years Applications. Gel battery is a new type of battery developed on the basis of traditional lead-acid battery, also known as “maintenance-free battery”. It has no environmental pollution, low self-discharge, good vibration resistance, ultra-high temperature resistance, ultra-low temperature resistance, and battery performance. Stability and other advantages.
Application in silicone rubber
The silanic hydroxyl group (Si-OH) on the surface of fumed silica can form a physical or chemical bond with the silicone rubber macromolecules to form a three-dimensional network structure that combines silica particles and rubber molecules to achieve reinforcement.
Application in unsaturated resin
Adding a small amount of fumed silica to the unsaturated resin can give the resin excellent transparency and excellent physical properties, and improve the quality of downstream products.
In the gel coat resin, the addition of fumed silica can improve its thixotropy, so that the resin has good tensile strength, bending resistance, water resistance, heat resistance and other properties, thereby prolonging its service life; in thixotropic resins, gas phase The addition of silica can give it excellent thixotropic properties and reduce the flow and dripping during use; in the putty, fumed silica can be used as an anti-settling agent, with excellent anti-settling effect and excellent Thixotropic properties.
Application in the optical fiber industry
Filling paste (oil paste, cold filling paste, etc.) used in optical fibers and cables can play a role in waterproof and moisture-proof and buffer, and improve the stability of transmission.
Fumed silica is a very ideal thickening thixotropic agent in filling pastes. The mechanism of action is: when the filling paste is placed, the filling paste can always be in a homogeneous and stable state; under the action of shearing force (pumping) during use, its viscosity is quickly reduced to a flowable state, which is convenient for filling in the fiber sleeve In the optical cable sheath, when the filling is completed, the shear stress is relieved, and the filling paste returns to a stable colloidal state, which plays a role of waterproof and buffering.
Application in heat preservation and heat insulation materials
Nano thermal insulation materials prepared by using fumed silica are important varieties of inorganic thermal insulation materials, which are widely used due to their excellent characteristics.
The special preparation process of fumed silica and the unique three-dimensional dendritic fluffy structure make it have the characteristics of small primary particle size (nano-level), large specific surface area, high porosity, and good thermal stability. It can be used in thermal insulation materials. It exhibits extremely low thermal conductivity and excellent thermal insulation effect.
Application in green tires
In the tire industry, fumed silica can greatly improve the physical and mechanical properties of the rubber compound, reduce the rolling resistance of the tire, and effectively improve the safety performance in wet and slippery weather. Adding silicon to the tread formula can “lubricate” the friction between rubber molecules, effectively reducing energy loss, and therefore reducing rolling resistance, thereby saving vehicle fuel consumption.
Application in ink
In the offset printing ink for heat printing, the use of hydrophilic fumed silica can speed up the drying speed of the ink and reduce the phenomenon of smudging and blurring of the ink; in the offset printing ink, use the hydrophobic fumed silica , Can reduce the water absorption of the ink, eliminate foam, increase the depth of the ink without affecting its surface gloss; in gravure printing, flexographic printing and silk printing, use fumed silica to adjust the viscosity and prevent pigment settling; vapor dioxide Silicon can also be used to control the flow of printer inks and control the fluidity of inks to obtain clear printing; it can be used as a dispersant and flow control agent in the toner cartridges of copiers and laser printers.
Application in paints and coatings
Fumed silica is widely used in paints and coatings as a rheological additive, which can effectively prevent the sedimentation and delamination of pigments and fillers, improve the weather resistance and scratch resistance of the coating, and improve the bonding strength between the coating and the substrate. .
1. Adding fumed silica to the wall coating can effectively prevent the coating from sagging, improve the flatness of the construction surface, and greatly improve the scrubbing resistance and aging time of the exterior wall coating, as well as the bonding strength of the coating film and the wall. It has also been greatly improved, the hardness of the coating film has been significantly increased, and the surface self-cleaning ability has also been improved.
2. Adsorbing fumed silica on the surface of the powder coating can form a movable layer, produce a “ball” effect, prevent the powder coating from absorbing moisture and agglomerate, and improve the fluidity of the powder coating.
3. The main function of fumed silica in floor paint is rheology control, which improves the weather resistance and scratch resistance of floor paint, and improves the leveling performance of the coating.
Application in adhesives and sealants
Utilizing the excellent reinforcement, thickening and thixotropic properties of fumed silica can prevent the precipitation of adhesives and sealants during storage and sag during curing, and improve their tearing strength and bonding strength.
When the fumed silica is uniformly dispersed in the adhesive and sealant system, it can form a network of silica aggregates. The aggregates form hydrogen bonds with the polymer through the silanol on the surface, which limits the fluidity of the system and the viscosity of the system Increased, so as to play a role in thickening; at the same time, under the action of shearing force, the hydrogen bond and silica network are destroyed, resulting in a decrease in the viscosity of the system, that is, a thixotropic effect occurs, which is convenient for construction; once the shearing force is eliminated, The silica network and hydrogen bonds are re-formed, which can effectively prevent the rubber from sagging during the curing process.
Post time: Oct-15-2021