1. Overview of Silicone Rubber
Silicone rubber is an elastic polymer material with both inorganic and organic molecular chains.
Its molecular chain is composed of silicon atoms and oxygen atoms alternately (-SI-O-SI-). The bond energy of silicon-oxygen bond is much greater than that of carbon-carbon bond of general rubber. This is because silicone rubber has a very high heat. One of the main reasons for stability. Its molecular side chain is a hydrocarbon or substituted hydrocarbon organic group connected to a silicon atom. In the early days, this group was a methyl group. Later, in order to improve the vulcanization activity of the raw rubber and other modifications, it was gradually developed In order to introduce a very small amount of unsaturated vinyl groups (generally no more than 0.5 MOL%) or other organic substituent groups on the side chain. This low-unsaturated molecular structure gives silicone rubber excellent heat aging and weather aging resistance, and is very stable to the effects of ultraviolet rays and ozone.
1). Excellent resistance to high and low temperature
Silicone rubber has the widest operating temperature range (-100～350℃). However, it must be pointed out that silicone rubber has poor resistance to high temperature and temperature sealing and aging. That is, when the air is isolated, especially when water is present, it will cause silicone rubber. The mechanical strength drops rapidly, and even breaks down into low-molecular-weight substances. This shortcoming can be achieved by adding a special heat-resistant stabilizer-a compound of cerium.
2). Excellent resistance to ozone aging, oxygen aging, and weathering aging resistance
After the silicone rubber vulcanized rubber is exposed to outdoor exposure in a free state for several years, there is no significant change in its performance.
3). Excellent electrical insulation properties
The silicon dioxide produced after burning is still an insulator, and its corona resistance and arc resistance are extremely good.
4). Special surface properties and physiological inertia
The surface energy of silicone rubber is lower than most organic materials. Therefore, it has low moisture absorption. Its water absorption rate is only 1% when immersed in water for a long time. The physical and mechanical properties are not reduced. Can play an isolation role. Silicone rubber is odorless, non-toxic, and has no adverse effects on the human body.
5). High air permeability
The permeability of N2, O2 and air at room temperature is 30-40 times higher than that of NR. It also has the selective performance of gas permeability, and the permeability of O2 is 1 times that of N2.
6). The oil resistance, radiation resistance and combustion resistance of special silicone rubber.
A. Oil resistance: It has good stability to aliphatic, aromatic and chlorinated hydrocarbon solvents, petroleum-based fuel oils, lubricating oils, hydraulic oils, etc. at room temperature and high temperature, and it has good stability to ethanol, acetone, etc. Resistance.
B. Flame retardancy: It can be made by using flame retardant.
C. Radiation resistance
3, the role of silicone rubber in the wire and cable industry
Because silicone rubber has good electrical insulation properties, high temperature resistance, oil resistance, radiation resistance, and combustion resistance. For the wire and cable industry, it is also more widely used, such as: silicone rubber wire, high temperature resistant silicone wire, flame retardant silicone wire, oil resistant silicone wire, flame resistant silicone wire and other products are developed through the special advantages of silicone rubber. It can be widely used in various industries.
Contact: Lynn Long
Phone: 0086 13640200141
Add: No. 19, Minye Street, Zhufoling Community, Tangxia Town, Dongguan City, China