What are the performance characteristics of the silicone rubber in the extra soft silicone wire? Silicone rubber is a polymer elastic material with a molecular chain that has both inorganic and organic properties. The heat resistance of silicone rubber is also very outstanding. It can work for a long time at 180 °C, and can withstand a few weeks or longer even if it is slightly higher than 200 °C. It can withstand high temperatures above 300 °C instantaneously. Silicone rubber has good air permeability and oxygen transmission rate is the highest among synthetic polymers. In addition, silicone rubber has outstanding properties of being physiologically inert and not causing coagulation, so it is widely used in the medical field. The main material of the extra soft silicone wire shell is silicone rubber.
The molecular chain of silicone rubber is composed of alternating silicon atoms and oxygen atoms (-SI-O-SI-). One of the main reasons for the high thermal 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 raw rubber and other modifications, it gradually developed In order to introduce a very small amount of unsaturated vinyl (generally not more than 0.5MOL%) or other organic substituent groups on the side chain. This low unsaturated molecular structure enables silicone rubber to have excellent heat aging and weathering resistance, and is very stable to ultraviolet rays and ozone.
The performance characteristics of the silicone rubber in the extra soft silicone wire:
1. Excellent high and low temperature resistance
Silicone rubber has the widest working temperature range (-180 ~ 350℃), but it must be pointed out that silicone rubber has poor high temperature, temperature and airtight aging resistance, that is, when it is isolated from air, especially when there is water at the same time, it will cause silicone rubber. Rapid decline in mechanical strength, and even cracking into low molecular weight. This disadvantage can be solved by adding a special heat-resistant stabilizer-cerium compound.
2. Excellent resistance to ozone aging, oxygen aging and weathering aging
The performance of silicone rubber vulcanizates has not changed significantly after several years of outdoor exposure in a free state.
3. Excellent electrical insulation properties
The silicon dioxide formed after combustion 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 that of most organic materials. Therefore, it has low hygroscopicity, and its water absorption rate is only 1% when immersed in water for a long time. can be isolated. Silicone rubber is odorless, non-toxic, and has no adverse effects on the human body.
5. High air permeability
At room temperature, the permeability of N2, O2 and air is 30 to 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. 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, various petroleum-based fuel oils, lubricating oils, hydraulic oils, etc. at room temperature and high temperature, and has good stability to ethanol, acetone, etc. resistance.
B. Flame retardancy: It can be obtained by using flame retardants.
C, radiation resistance.
The above is the "performance characteristics of silicone rubber in extra soft silicone wire". It is precisely because of the above advantages of silicone rubber that it is widely used as silicone wire. If you want to know more about silicone wire, please Come to you ZHONGZHEN NEW ENERGY Factory.