In the application of rubber without reinforcement of silicone rubber, its strength is generally only 03MPa, almost can not be used. In order to reach the level of practical application, it must be filled and modified. In the common inorganic powder fillers (calcium carbonate, precipitated silica, etc.), after silica filling, the internal microscopic interaction of the material has a great change, in addition to the presence of weak van der Waals force between molecular chains caused by the intermolecular entanglement and mechanical entanglement caused by mechanical force. There are hydrogen bond of the strong interaction between sio2 aggregate, silicon dioxide and strong adsorption or bonding effect between polymer and polymer adsorption on the surface of the silica aggregate, big strong mutual entanglement between points in the chain effect, make the interface bonding was significantly improved, throughout the macromolecular polymer chain is formed within the silicon rubber plate carbon black network structure, Thus endows the material with superior comprehensive performance. Silica can greatly improve the physical and mechanical properties of rubber and rubber lag, rolling resistance of tyre was reduced, and no loss of wet resistance and attracted much attention, so the application of other organic outside of silicone rubber is becoming more and more widely, and its fruit completely achieved the level of carbon black, and overcome the black carbon black pollution, can be widely used in color rubber products.

In the field of silicone sealants and adhesives, silica can be used as a thickener and thixotropic agent, which can increase bonding strength, ensure free flow, prevent caking and hanging, collapse, sag during curing, maintain transparency, reinforcing, shear resistance and other functions. The thickening and thixotropic mechanism of silica is that when it is dispersed in sealants and adhesives, hydrogen bonding is generated between different particles through the silica alcohol groups on the surface, forming a silica aggregate network, which restricts the fluidity of the system and increases the viscosity. Play the role of thickening; Under the action of shear force, the silica network is destroyed and the viscosity of the system decreases. The thixotropic effect occurs, which is convenient for construction. Once the shear force is eliminated, the network structure can be formed again, which effectively prevents the glue from hanging in the curing process.

The application of silicon dioxide in plastics can improve the compactness, smoothness and wear resistance of plastic products by using the effect of high strength, high fluidity and small size. By proper surface modification, the plastics can be strengthened and toughened at the same time. The silica can be uniformly dispersed in the matrix by adding gasified silica black to polyethylene by a special method, and the polyethylene composite with high wear-resistance and hardness can be prepared. The brittleness of epoxy resin can be improved obviously by adding gased silica, and the defects of material rigidity and strength decrease caused by toughening of elastomer can be overcome, so as to achieve the purpose of strengthening and toughening. When the addition amount is 3wt %, the impact strength and tensile strength of the composite system can be increased by 40% and 21%. If nano-silica is modified by coupling agent, the impact toughness and tensile property of nano-silica can be improved by 124% and 30%, and the hardness, wear resistance, temperature resistance and insulation properties of the products are also improved.


China is a big country in the production and consumption of coatings, but the current coating generally exists suspension stability, thixotropy, weather resistance, washing resistance and other poor performance problems, resulting in the import of a large number of imported coatings every year. Adding a little white carbon black in the paint can provide anti-caking, anti-flow hanging, emulsification, extinction, suspension, thickening and thixotropy and other functions. SiO2 can play a good role in the anti-settling of copper composite conductive system, and the settling of conductive powder can be greatly restricted when the addition amount of SiO2 reaches 1.5%. The influence of silicon dioxide on the settlement of copper composite conductive coating in the coating is to change the optical properties of the coating surface of the auxiliary agent, this kind of assistant can produce expected micro roughness on the surface of the film, so that the luster of the coating is reduced. Silica is an inorganic matting agent, widely used in wood coatings, high solid coatings, acid catalytic coatings, architectural coatings, electrodeposition coatings, fabric coatings, military coatings, ethylene coatings, wall paper coatings.