Soundproof Damping Material（2）
Low temperature sex
Butyl rubber chain spiraling space construction, is the methyl is more, but scattered in each pair of methyl each other on either side of the spiral stagger an Angle, so butyl rubber molecular chain remains fairly mild, low glass transition temperature, elasticity is better also.
The high saturation of the butyl rubber molecular chain makes it highly resistant to ozone and weathering. Ozone resistance is about 10 times better than natural rubber.
The high - saturated structure of butyl rubber has high chemical invariance. Butyl rubber to mostly inorganic acids and organic acid has better corrosion resistance, is it not resistant to strong acid oxidation, such as nitric acid and sulfuric acid, but non oxidizing acid and oxidation medium concentration of acid, and alkali solution and oxidation recovery solution. After 13 weeks of immersion in 70% of sulfuric acid, the strength and elongation of butyl rubber did not lose, while the function of natural rubber and styrene butadiene rubber decreased severely.
The electrical insulation and corona function of butyl rubber are better than that of rubber, and the volume resistivity is 10 times higher than that of the shallow rubber, and the dielectric constant is (1kHz), and the power factor (100Hz) is 0.0026.
Butyl rubber water penetration rate is extremely low, bibulous rate is lower than other rubber in normal temperature, only 1/10 ∽ 1/15 for the latter.