Fumed silica is used in various fields
1. Electronic packaging materials

For example, organic electroluminescent device (OELD) is a new type of flat display device newly developed at present, but the service life of OELD device cannot meet the application requirements. One of the technical difficulties to be solved is the packaging material and packaging technology of the device. . The fumed silica after surface active treatment is fully dispersed in the silicone modified epoxy resin encapsulant matrix, which can greatly shorten the curing time of the encapsulation material (2.0-2.5h), and the curing temperature can be reduced to At room temperature, the sealing performance of the OELD device is significantly improved, and the service life of the OELD device is increased.

2. Resin composite material

Fully and uniformly dispersing the fumed silica particles into the resin material can achieve the purpose of comprehensively improving the properties of the resin-based material. Increased strength, elongation, wear resistance, improved surface finish and enhanced anti-aging properties.

3. Plastic

The use of fumed silica with light transmission and small particle size can make the plastic more compact. After adding fumed silica into the polystyrene plastic film, it not only improves its transparency, strength, toughness, but also waterproof performance and anti-aging performance. also significantly improved. The hardness, smoothness and anti-aging properties of the plastic-steel doors and windows produced by adding a small amount of fumed silica to ordinary plastic PVC are greatly improved.

4. Coating
my country is a big country in the production and consumption of coatings, but the current domestic coatings generally have insufficient performance, resulting in the need to import a large number of high-quality coatings every year. Some coating manufacturers in Shanghai, Beijing, Hangzhou, Ningbo and other places have successfully realized the application of fumed silica in coatings. This nano-modified coating has changed the shortcomings of previous products, and its main performance indicators have been tested. Except for the same ratio, the rest have increased significantly.

5. Rubber

Rubber is an elastomer with excellent stretchability. In the production of rubber products, carbon black is usually added to the rubber compound to improve strength, abrasion resistance and aging resistance. However, due to the addition of carbon black, the products are all black. The fumed silica has laid a material foundation for the production of a new generation of rubber products with novel colors and excellent performance. After adding a small amount of fumed silica to ordinary rubber, the strength, wear resistance and aging resistance of the product reach or exceed that of high-grade rubber products, and the color can remain unchanged for a long time. Nano-modified color EPDM waterproofing membrane, its wear resistance, tensile strength, folding resistance, anti-aging properties are significantly improved, and the color is bright, and the color retention effect is excellent.

6. Ceramics

Using fumed silica instead of nano-A1203 to add to ceramics can not only play the role of nanoparticles, but also the particles of the second phase, which not only improves the strength and toughness of ceramic materials, but also improves the hardness and elasticity of materials. Modulus and other properties, its effect is more ideal than adding A1203.

7. Sealant, adhesive

Adding hydrophobic fumed silica into the sealant will quickly form a silica structure, that is, nano-SiOX small particles form a network structure to inhibit colloid flow, accelerate curing speed, and improve bonding effect. The small ruler also increases the sealing and impermeability of the product.

8. Cosmetics

The fumed silica has strong UV-reflecting ability and good stability. It does not decompose or discolor after being irradiated by UV light, nor does it react chemically with other components in cosmetic formulations. These outstanding characteristics of fumed silica have laid a good foundation for the upgrading of sunscreen cosmetics.