Precipitation method silica has excellent properties such as porosity, high dispersibility, light weight, good chemical stability, high temperature resistance, non combustion, and good electrical insulation, making it an important reinforcing filler. The most important application of white carbon black is as a reinforcing agent for rubber, with a dosage of about 80% -90% of the total production. It can be widely used in many fields of the rubber industry.

1. Application of precipitated silica in rubber products


1.1 Tires

White carbon black was initially only used in decorative strips for car tires with white tires, but its use gradually expanded. At present, white carbon black has been used in various tire components, including heavy-duty tires, sedan tires, agricultural tires, etc. According to the material of the tire fabric, it is divided into all steel, semi steel, and fiber tire fabric tires, with usage areas including tread, belt layer, sidewall, and steel wire adhesive. In traditional diagonal tires, white carbon black can improve the tear resistance of the tread and the adhesion performance between rubber and cord. With the increasing demand for radial tires, environmental protection, energy conservation, and comfort, the application of white carbon black in tires is becoming increasingly important. At present, people's basic requirements for tires are:


(1) Having high grip (anti wet skid) or good traction on wet roads to ensure the safety of vehicles and personnel. (2) Low rolling resistance to save fuel and reduce exhaust emissions. (3) Good wear resistance and long service life. In order to achieve the above performance, the application of white carbon black, especially highly dispersed white carbon black, in tread rubber is essential. Especially with the emergence of green tires, it has sparked the development heat of large precipitated white carbon black manufacturers in the world for highly dispersed precipitated white carbon black.

1.2 Silicone rubber


Silicone rubber has high heat resistance, excellent cold resistance, ozone resistance, atmospheric aging resistance, and excellent electrical insulation. In addition, silicone rubber has low water absorption and can be stored in humid places for a long time. It can be widely used in aviation, aerospace, military, electrical, medical and other departments. However, silicone rubber molecules have a spiral structure, high flexibility, weak intermolecular forces, and are difficult to crystallize. The tensile strength of raw rubber after vulcanization does not exceed 0.34 MPa, which greatly limits its application. Adding reinforcing fillers is the main means of adjusting the physical and mechanical properties of silicone rubber, and only by adding reinforcing materials such as silicone rubber can it have practical value. In order to reduce the production cost of silicone rubber products, the market has begun to partially replace gas-phase white carbon black with ultrafine precipitation method white carbon black. Significant breakthroughs have been made in application research, resulting in a rapid increase in demand for silica rubber specific ultrafine precipitation method white carbon black. In response to this situation, in recent years, major producers of ultrafine precipitated silica in the world have invested in the development and construction of ultrafine precipitated silica production lines for silicone rubber.


1.3 Rubber rollers, tapes, hoses and other products and plastics


White carbon black is widely used in the preparation of light colored and high-performance products in printing rubber rollers, rice milling rubber rollers, textile rubber rollers, and papermaking rubber rollers. Products such as steel braided hoses, high-strength conveyor belts, colored hoses, adhesive tapes, colored sealing products, and colored high-performance cable sheaths all rely on white carbon black. After ultrafine refining, white carbon black can be used as a blow film isolation agent for plastic films and an additive for EVA plastic foaming materials. Compared with commonly used inert fillers such as calcium carbonate, white carbon black can significantly improve the quality of materials