The role of ultrafine silica modification
Silica is more and more widely used in various industries as additives, catalyst carriers, petrochemicals, decolorizing agents, matting agents, rubber reinforcing agents, plastic fillers, ink thickeners, metal soft polishing agents, insulating and heat insulating fillers Agents, advanced daily cosmetic fillers and spraying materials, medicine, environmental protection and other fields. And it provides a new material basis and technical guarantee for the development of related industrial fields.

Among them, the ultra-fine silica is an amorphous particulate powder or granular, with high insulating properties, insoluble in water and common acids, soluble in caustic alkali and hydrofluoric acid, not decomposed by high temperature, water absorption, no poison. Adhesion, anti-blocking, anti-caking, agglomeration, controlled release, carrier, flow aid, print enhancement, mechanical action, special additives for thermoplastics, surface modification, reinforcement, rheology control, brightening. Application of ultra-fine silica: mainly used in handicrafts, shoemaking, tires, cables and other rubber industrial products industry, can also be used as a carrier or thickener in chemical industry, rubber reinforcement, fire extinguishing agent, super absorbent, Defoamers, feed, food, coatings and paints, paper industry, newspapers, inkjet printing paper, thermal paper, pharmaceuticals, pesticides, plastics, unsaturated polyester, printing oil base, silicone rubber.

Its particle diameter is below 0.2Lm to nanometer (1-100nm) silica particles, in addition to the properties of ordinary silica, it also has some unique properties, such as surface effect, volume effect, small size effect, quantum size effect And macroscopic quantum tunneling effect, these characteristics make it widely used in the fields of rubber, plastics, coatings, adhesives, biomedicine and catalysts.


In addition, because ultrafine silica can work under heavy load, low speed and high temperature, it is also a high-performance, environmentally friendly lubricant additive with great development potential, but the research on ultrafine silica as lubricant additive Still in the experimental stage.

Because the surface of ultrafine silica has strong hydrophilicity, large specific surface area and high surface energy, it is easy to be added to the polymer matrix, thereby affecting the mechanical, optical and electrical properties of the composite material. Surface modification can improve its shortcomings of easy agglomeration and poor dispersibility, so that it can obtain better dispersibility and compatibility in organisms.

According to the existing research, the modified silica has excellent friction properties, which can significantly improve the anti-friction and extreme-pressure wear resistance of lubricants, and after modification, it can functionalize its surface, So as to improve the comprehensive properties of the material, it can be better applied to the progress of material.