What is the efficacy and role of silica

Overview of Fumed Silica

Fumed silica is a nano-scale white powder generated by high temperature hydrolysis of silicon halide in a hydrogen-oxygen flame, commonly known as fumed silica, which is an amorphous silica product with a primary particle size of 7~40nm. The aggregate particle size is about 200-500 nanometers, the specific surface area is 100-400 m2/g, the purity is high, and the SiO2 content is not less than 99.8%. The untreated fumed silica aggregates contain a variety of silanol groups.

In the whole production process of fumed silica, it has the following characteristics:

(1) In terms of raw materials, the raw materials for synthesizing fumed silica are very simple, one is halosilane (SiCl4 and CH3SiCl3) and combustible gas (hydrogen and oxygen (air)), which can effectively prevent other substances from being brought into the product.

(2) In terms of technology, the halosilane is vaporized first and then enters the reactor. The temperature of the hydrolysis reaction is also around 2000 °C, and then the processes of aggregation, separation, and deacidification are completed at high temperature. The whole process is in a continuous, sealed The system is completed to ensure that the product is free from external influence and pollution.

(3) All key links of the entire production unit are made of high temperature, acid and alkali corrosion resistant materials, which can prevent other pollution sources from entering the product during the production process.

Due to the characteristics of raw materials and production processes in the production of fumed silica, the fumed silica products have small particle size (primary particle size 7-40nm), large specific surface area (100-400m2/g), and high surface activity ( The surface contains highly active Si-OH groups); the fumed silica products prepared under this special process also have a special three-dimensional dendritic structure, and the product has high porosity. In appearance, fumed silica appears as a "smoke"-like fluffy white ultrafine powder, so it has the English name of fumed silica.

Application of Fumed Silica

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 stratification of pigments and fillers, improve the weather resistance and scratch resistance of coatings, and improve the bonding strength between the coating and the substrate. .

Application in fertilizer and feed

Fumed silica has strong adsorption and hygroscopicity, which can promote the free flow of powders such as fertilizers and feeds, facilitate the transportation and storage of powders, and prevent them from getting wet.

Application in pesticides and medicine

Fumed silica has the characteristics of small particle size, large specific surface area, strong adsorption performance, and easy suspension. It can absorb a large number of water molecules in water and swell into extremely fine particles to form a stable suspension. Taking advantage of these properties, it can be used as a carrier for pesticide wettable powder, granules, water dispersible granules, as a dispersant and thickening agent for suspending agents; at the same time, adding fumed silica to medicines can be used as an anti-caking agent for medicines , drug carriers and excipients, so as to achieve the purpose of prolonging the efficacy.

Application in Adhesives and Sealants

The excellent reinforcing, thickening and thixotropic properties of fumed silica can prevent the precipitation of adhesives and sealants during storage and sag during curing, and improve their tear strength and bond strength.

Price of fumed silica

The price of fumed silica will vary with the production cost, transportation cost, international situation, exchange rate and market supply and demand of fumed silica. Tanki New Materials Co., Ltd. aims to help various industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full range of customized services. If you are looking for fumed silica powder, please feel free to send an inquiry for the latest price of fumed silica.

Supplier of fumed silica

As a global supplier of fumed silica powders, Tanki New Materials Ltd. has extensive experience in the performance, application and cost-effective manufacturing of advanced engineering materials. The company has successfully developed a series of powder materials (including boron carbide, aluminum carbide, titanium carbide, etc.), high-purity targets, functional ceramics and structural devices, and provides OEM services.