Although the wire and cable industry is only a supporting industry, it accounts for 1/4 of the output value of China's electrical industry and is the basis of all industries. It involves power, construction, communication, civil, manufacturing, petrochemical and other industries, and is closely related to all sectors of the national economy. Wire and cable are also known as the "artery" and "nerve" of the national economy. It is an indispensable basic equipment for transmitting electric energy, transmitting information, manufacturing various motors, instruments and meters, and realizing electromagnetic energy conversion. It is also an essential basic product in the future electrification and information society, Wide demand. The wires and cables in the field of new energy vehicles and rail locomotives belong to special wires and cables, which will encounter various harsh natural environments during use. These natural environments, including large temperature difference between day and night, sunlight, weathering, humidity, acid rain, freezing and seawater, will seriously affect the service life and performance of wires and cables, even reduce the reliability and safety of wires and cables, causing property losses and personal injuries.

Therefore, on the basis of ensuring excellent insulation performance, it is generally required to have excellent waterproof, acid and alkali resistance, aging resistance, oil resistance, weather resistance, low smoke flame retardant, environmentally friendly and harmless properties. Due to flexible use, it is inevitable that there will be artificial bending, twisting, dragging and other phenomena, which are very easy to cause mechanical damage. In addition, it is required that the cable has excellent flexibility, flexibility, wear resistance and mechanical properties.

Due to its excellent comprehensive performance, silicone rubber has been widely used in new energy vehicles and railway locomotive wires and cables, especially those with high requirements for high and low temperature resistance. However, the performance of general silicone rubber materials can not fully meet the use requirements of new energy cables, and can not guarantee the safe operation and service life of new energy cables. This is mainly reflected in some defects of important properties of silicone rubber, such as long-term aging resistance, oil resistance, solvent resistance, water immersion breakdown voltage resistance, flame retardancy, and mechanical properties. Some technical measures must be taken to improve and balance the long-term aging resistance, flame retardancy Mechanical properties (especially tear resistance), acid and alkali resistance, oil resistance, voltage resistance, impact resistance, solvent resistance and other properties can meet the requirements of the industry.

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