Silica shows a significant reinforcing effect in silicone (especially silicone rubber), which is mainly reflected in improving the mechanical properties, heat resistance, antioxidant properties and chemical stability of silicone. The following is a detailed analysis of the reinforcing effect of white carbon black in silicone:

1. Basic characteristics of silica
High surface area: White carbon black particles are extremely small and porous, and the surface area per unit mass is much larger than that of general fillers, which enables it to interact closely with the molecules in silicone and increase the cohesion of silicone.

High surface activity: The surface of white carbon black contains a large number of hydroxyl groups, which can adsorb additives and auxiliaries in silicone, thereby enhancing the processing performance of silicone.

Good dispersibility: silica particles are small and porous, easy to disperse in the silicone matrix, and better interact with silicone, thereby enhancing the strength and wear resistance of silicone.

2. The reinforcing effect of white carbon black on silicone performance
Reinforcing effect:
Silica is one of the best reinforcing agents for silicone rubber. It can significantly improve the mechanical strength and electrical properties of vulcanized silicone rubber. The reinforcement mechanism mainly includes filler particles adsorbing polymers and filler particles combining with polymer segments.
The tear strength of silica reinforced silicone is significantly improved, which is suitable for manufacturing products with high strength requirements such as large-size tire tread rubber.
Improve heat resistance and antioxidant properties:
Silica has excellent heat resistance and chemical inertness, which can improve the service life of silicone products.
In some high-temperature application scenarios, increasing the amount of silica addition can improve the thermal stability of silicone.
Improve weather resistance and chemical corrosion resistance:
Silica can react with the vulcanizer and cross-linking agent in silicone to form a cross-linked structure, thereby enhancing the chemical corrosion resistance of silicone.
This helps to improve the stability of silicone products in harsh environments such as acids, alkalis and solvents.

3. Types and selection of silica
Vapor silica: prepared by the gas phase method, finer particles, larger specific surface area, and better reinforcement effect. However, the operating performance may be slightly worse and the cost is higher.
Precipitated silica: prepared by the precipitation method, with slightly lower mechanical strength and possibly poorer dielectric properties. But it has good heat aging resistance and relatively low cost.
In practical applications, the appropriate type and amount of silica should be selected according to specific needs.

4. Modification and application fields of silica
Modification:
Modification of silica with silane coupling agent can improve its dispersibility and reinforcement effect in silicone.
Through technical means such as structural control, the structuring problem of silica-filled silicone can be prevented.
Application fields:
Electronic products: Improve the heat resistance and aging resistance of silicone to meet the high requirements of electronic products for material performance.
Aviation and automotive industries: Used to manufacture components such as seals and high-temperature cables to improve the heat resistance, wear resistance and aging resistance of products.
Other fields: Such as medical devices, fine chemicals, etc., silica also plays an important reinforcing role.

In summary, silica shows a significant reinforcing effect in silicone. Through reasonable selection and modification, the performance of silicone can be significantly improved and the needs of different application fields can be met.