High temperature resistant silicone rubber material is one of the indispensable and important materials in automobile manufacturing. It can not only optimize the automobile manufacturing process, but also improve the performance and safety of automobile. At present, it has been widely used in various parts of automobile, such as airbag coating, power transmission seal, gasket, hose, windshield lining, automobile engine seal, ignition line and coil sheath , automobile turbocharger pipe cooling pipe, sealing and protection of automobile components, high-voltage cable and harness sealing, etc.

Compared with traditional fuel vehicles, hybrid electric vehicles and pure electric vehicles add many high-voltage accessories, such as power battery, high-voltage distribution box, drive motor, motor controller, etc., which also puts forward new requirements for automotive cables. Because these cables are arranged in the engine and chassis area of the front cabin, with high temperature and narrow space, they need to be soft, small turning radius and good high and low temperature resistance; secondly, the road conditions are complex, the wear resistance of the cables must be good and the mechanical strength must be high; in addition, the speed is high and low, especially the full load climbing and other adverse conditions, the instantaneous large current requires the cables to have short-term overload capacity 。

To sum up, the new energy vehicle cable must have: good electrical insulation performance; thermal stability, weather resistance; corrosion resistance, oil and hydrophobic resistance, excellent flame retardant performance; superior comprehensive mechanical performance, high flexibility and tear resistance, etc.

At present, the automotive power cable insulation materials include crosslinked polyolefin and thermoplastic elastomer. Among them, the heat resistance of cross-linked polyolefin material can reach 150 ℃, but the cable of this material is relatively hard, and it is inconvenient to install in the narrow car body space, and it needs irradiation cross-linking, and the process is complex, so it is not suitable for large cross-section cable. However, the heat resistance of thermoplastic elastomer material is not more than 125 ℃, and the temperature grade of power cable is low, and the cable of thermoplastic elastomer material will have the risk of cracking in long-term use.

High temperature resistant silicone rubber has high and low temperature resistance, ozone resistance, weather resistance and excellent electrical insulation; silicone rubber has large line carrying capacity, saves conductor section, and can meet the requirements of long-term full load operation; it can meet the requirements of fire resistance by adding flame retardant; it has high softness, and is easy to install in limited space; high tear resistant silicone rubber, pants type tear can reach 25N / mm. Therefore, silicone rubber material can not only make up for the advantages of cross-linked polyolefin and thermoplastic elastomer, but also reduce the weight and carbon dioxide emission of the car. It is a high-quality choice for the power cable of the car.