As an important reinforcing agent, silica (also known as nano-silica) is widely used in rubber, plastic, coating and other fields. However, in practical applications, in order to obtain better performance, silica often needs to be used in combination with other reinforcing agents. The following are several key points for the use of silica with other reinforcing agents:

1. The complementary effects of silica and other reinforcing agents
Reinforcement effect: silica itself has excellent reinforcing properties, but when used in combination with other reinforcing agents such as carbon black and calcium silicate, it can further enhance the mechanical strength, wear resistance and aging resistance of the material.
Performance optimization: Different reinforcing agents have differences in dispersibility in materials and compatibility with the matrix. The use of them together can optimize these properties and make the materials more uniform and stable.

2. Use of silica with coupling agents
The role of coupling agents: Coupling agents are chemical substances that can improve the interfacial properties between inorganic fillers (such as white carbon black) and organic polymer materials. Through the bridging effect of coupling agents, the dispersibility and bonding strength of silica in organic polymer materials can be significantly improved.
Effect of combined use: In rubber products, the use of silica modified with coupling agents can significantly improve the tensile strength, elasticity, wear resistance and other properties of rubber. Especially in low-hardness butyl rubber, the reinforcing effect of silica modified with coupling agents is more significant.

3. Precautions for the combined use of silica with different reinforcing agents
Addition order and proportion: The addition order and proportion of different reinforcing agents have an important impact on the performance of the material. In actual production, the optimal addition order and proportion need to be determined according to the specific application scenario and performance requirements.
Mixing uniformity: The dispersion uniformity of the reinforcing agent in the material has a direct impact on the performance of the material. Therefore, appropriate measures need to be taken during the mixing process (such as extending the mixing time, increasing the mixing temperature, etc.) to ensure the uniform dispersion of the reinforcing agent in the material.
Reaction conditions: Some reinforcing agents may require specific conditions (such as temperature, pressure, catalyst, etc.) when reacting with other substances. Therefore, when used in combination, it is necessary to pay attention to controlling these reaction conditions to ensure the smooth progress of the reaction.

4. Actual Cases
In rubber products, silica is often used in combination with carbon black to improve the reinforcement effect and comprehensive performance of rubber. For example, in low-hardness butyl rubber, the use of silica modified by coupling agent and carbon black can significantly improve the tensile strength, elasticity, wear resistance and other properties of rubber. At the same time, by adjusting the addition ratio and mixing process of silica and carbon black, the performance of the material can be further optimized to meet different application requirements.

In summary, the use of silica in combination with other reinforcing agents can significantly improve the performance of the material and meet different application requirements. In actual applications, attention should be paid to factors such as the order of addition, ratio, mixing uniformity and reaction conditions to ensure the best performance.