Silica has a significant effect on the heat resistance of silicone (especially silicone rubber). The following is a detailed analysis of this effect:

1. Mechanism of Silica to Improve Heat Resistance of Silicone

Enhanced Thermal Stability:
Silicate can maintain its stability and strength at high temperatures due to its highly crystallized structure.

When silicone rubber undergoes thermal oxidation decomposition under high temperature conditions, the generated free radicals react with the silanol groups on silica and are consumed, which helps to improve the heat resistance and stability of silicone rubber.

Improved Antioxidant Performance:
The surface of silica contains a large number of active groups, which can react with oxygen to form a stable oxide protective film, effectively preventing the oxidation of the material and the formation of oxidation products.

The high temperature resistance of silicone rubber can be further improved by reducing the number of hydroxyl groups on the surface of silica and modifying silica with a silane coupling agent.

Low Thermal Expansion Coefficient:
Silicate has a low thermal expansion coefficient, which can reduce thermal stress and thermal strain when heated, which is beneficial to improve the heat resistance and stability of the material.

2. Effect of white carbon black in silicone
Significantly improve heat resistance temperature:
The heat resistance temperature of silicone rubber after adding white carbon black can usually be significantly improved. For example, in some applications, adding white carbon black can make the continuous use temperature of silicone rubber reach above 250℃.
Enhance mechanical properties at high temperature:
Under high temperature conditions, white carbon black can enhance the mechanical properties of silicone rubber, such as tensile strength and tear strength. This allows silicone rubber to maintain good performance under high temperature environment.
Prolong service life:
Since white carbon black improves the heat resistance and oxidation resistance of silicone rubber, it can significantly extend the service life of silicone rubber products.

3. Effect of white carbon black addition amount
Choice of addition amount:
The amount of white carbon black added to silicone rubber directly affects the performance of silicone rubber. The appropriate amount of addition can significantly improve the heat resistance and mechanical properties of silicone rubber; but too much addition may cause the processing performance of silicone rubber to decrease, and even affect the quality of the product.
Optimize the addition amount:
In order to obtain the best heat resistance and mechanical properties, the amount of white carbon black added needs to be optimized. This usually requires experiments to determine the best addition ratio.

In summary, white carbon black significantly improves the heat resistance of silicone (especially silicone rubber) through its unique structure and properties. In the production of silicone products, the reasonable addition of white carbon black can not only improve the heat resistance temperature and service life of the product, but also enhance the mechanical properties at high temperatures. Therefore, white carbon black has broad application prospects in the silicone industry.