Precipitated silica is widely used in the rubber industry and has a significant effect on improving the performance of rubber products. The following is a detailed analysis of its application and performance improvement:

1. Application of precipitated silica in the rubber industry
Main applications:
Reinforcement agent: Precipitated silica is a commonly used reinforcing agent in the rubber industry, especially for natural rubber and synthetic rubber. It can significantly improve the mechanical strength, wear resistance and aging resistance of rubber products.
Specific products: Precipitated silica is widely used in rubber products such as footwear and tires. For example, after using silica in rubber parts in shoe materials, the hardness, tensile strength, tear strength, wear resistance, anti-slip properties and adhesion of the product are significantly improved. Adding an appropriate amount of silica to tire tread rubber and carcass rubber can help improve tear strength, rubber-cord adhesion, etc.
Other applications:
In printing rubber rollers, rice milling rubber rollers, textile rubber rollers, papermaking rubber rollers and other products, white carbon black is also widely used to prepare light-colored products and high-performance products.
Steel braided rubber hoses, high-strength conveyor belts, colored rubber hoses, tapes, colored sealing products, colored high-performance cable sheaths and other products are also inseparable from the application of white carbon black.
In the field of daily necessities, such as household appliances, stationery and other rubber products, white carbon black has also been widely used due to its good reinforcement properties and unique advantages such as pure white and transparency.

2. Improvement of rubber performance by precipitated white carbon black
Mechanical strength:
The surface of precipitated white carbon black particles contacts with rubber macromolecules to produce physical adsorption, and combines with rubber molecular chains to form a strong chemical bond to generate "bound rubber", thereby significantly improving the mechanical strength of rubber products.
Wear resistance:
Precipitated white carbon black can increase the wear resistance of rubber products and extend their service life. The application of white carbon black is particularly important in rubber products such as tires that require high wear resistance.
Aging resistance:
Silica also has excellent aging resistance and can resist the erosion of rubber products by environmental factors such as ultraviolet rays and ozone, thereby extending its service life.
Processing performance:
During the rubber processing process, precipitated silica can improve the fluidity, dispersibility and plasticity of the rubber, making the processing process smoother.

3. Factors affecting the performance of precipitated silica
Particle size:
In theory, the smaller the silica particle size, the better the dispersibility in the rubber, the larger the effective contact area with the rubber, and the more obvious the reinforcement effect. However, too small a particle size will lead to a decrease in the plasticity of the rubber and poor extrusion performance.
Structure:
The greater the structure, the more branched structures of silica in an aggregated state, and more energy is required to destroy its branched structure. In order to ensure that high-structure silica is evenly dispersed in the rubber, the mixing time needs to be appropriately extended.
Specific surface area:
The larger the specific surface area, the higher the adsorption rate and activity of silica, which can adsorb more accelerators and accelerate the decomposition of accelerators, so it has a strong delay effect on the vulcanization of the rubber. At this time, it is necessary to increase the amount of accelerator appropriately to increase the vulcanization speed.
Water content:
The water content of precipitated silica includes free water and bound water. Too much or too little free water will affect the activity and reinforcement effect of silica. Generally, when the surface water is 6%~8%, it can best isolate the silica molecules, thereby preventing the particles from aggregating again. During mixing, it can be evenly distributed in the rubber compound, which is conducive to performance improvement and accelerated vulcanization speed.

In summary, precipitated silica has broad application prospects and significant performance improvement in the rubber industry. By reasonably controlling its physical and chemical indicators such as particle size, structure, specific surface area and moisture, its application effect in rubber products can be further optimized.