Application of fumed silica powder materials
Since its introduction, fumed silica has attracted widespread attention due to its excellent properties. It is currently widely used in various industries, such as reinforcing rubber, adding it to plastics as a filler, adding it to inks as a thickener, adding it to cosmetics as a high-grade filler, etc. It is also used in coatings, paints, and adhesives. Fumed silica also shows excellent properties different from other materials in terms of magnetism, catalysis, melting point, etc., so it is also used as a functional additive. In recent years, nanotechnology has developed rapidly and achieved remarkable results. Fumed silica has a nanometer-scale particle size, is non-toxic and has high purity. Therefore, it has attracted the attention of researchers in some emerging fields and has made beneficial progress.
Application of fumed silica in the field of oxidative desulfurization
With the use of fossil fuels, the emission of sulfides is gradually increasing, leading to serious environmental pollution, destroying the ecosystem, and endangering human health. Therefore, deep desulfurization of fuel oil has gradually become an environmental problem that needs to be solved urgently. Hydrodesulfurization is a relatively developed technology that can remove most sulfides. However, the removal effect of heterocyclic sulfides and their derivatives is not good. Therefore, predecessors have studied and developed a variety of desulfurization technologies such as adsorption, extraction, and oxidative desulfurization (ODS). Among them, the ODS method has mild reaction conditions, simple operation process, and efficient desulfurization.
Application of fumed silica in food hygiene
A three-sided filler composed of fumed silica, iron and tea polyphenols, fumed silica fully increases the effective active quantity of iron and tea polyphenols, and significantly reduces Gram-positive Staphylococcus aureus and Gram-negative Staphylococcus. In addition, with the increase of loading, the antioxidant activity is affirmed, reaching a maximum value of 67%, and the specific migration limit of iron is lower than the limit applicable in the current food contact material regulations.
Application of fumed silica in the rubber field
Fumed silica is also commonly used in the preparation of silicone rubber. For room temperature vulcanized silicone rubber, fumed silica can not only improve its tensile strength, but also act as a thickener and thixotropic agent to control the performance of room temperature silicone rubber to a certain extent. Fumed silica can also be used to fill silicone resins, especially those used in the electronics field and silicone rubber mixing.
Application of fumed silica in ink and coating
In industry, people often add fumed silica to ink and coating to improve their rheological properties, and it also acts as a dispersant and anti-settling agent. Fumed silica is also added to some high-end coatings, such as marine ship coatings and industrial repair coatings, mainly due to the thixotropic and matting properties of fumed silica. In some high-solid content coatings with high environmental requirements, fumed silica is usually added to improve the thixotropic and dispersing properties of the coating. In industrial inks, an appropriate amount of fumed silica is generally added to adjust its rheological properties.
Application of fumed silica in the field of lithium batteries
Lithium metal soft-pack batteries have high energy density, light weight, lower cost and are more suitable for large-scale production. However, due to the characteristics of metallic lithium, the uncontrollable growth of Li dendrites during charging and discharging greatly hinders the cycle stability and commercialization of lithium batteries. Based on the nano characteristics and unique dielectric constant of fumed silica, the physical and chemical properties of lithium electrodes can be effectively improved, the growth of Li dendrites can be avoided, and the number of charge and discharge times of lithium batteries can be increased.
Application of fumed silica in mechanical polishing
Chemical mechanical polishing (CMP) is a leading technology for semiconductor device processing at this stage. CMP in the microelectronics field requires high slurry concentration and low impurity ion content. Both precipitated silica and fumed silica can meet this requirement, but precipitated silica is difficult to achieve high purity requirements. Fumed silica is the most ideal choice, and has low impurity ion content. It is easier to make the substrate material in the process flat for easy processing.