Silicone rubber has a lot of advantages and properties, different properties have its role, what are the properties of silicone rubber?Next, Zinca will give you a brief introduction.
1. High and low temperature resistance
Among all rubber, silicone rubber has a wide operating temperature range of Z (-100 ~ 350℃).For example, through appropriate matching vinyl silicone rubber or low phenyl silicone rubber, after 250℃ for thousands of hours or 300℃ for hundreds of hours of hot air aging can still maintain elasticity;Low phenyl silicone rubber vulcanized rubber can remain elastic after tens of hours of hot air aging at 350℃. Its glass transition temperature is -140℃, and its vulcanized rubber still has elasticity at the temperature of -70 ~ 100℃.When the silicone rubber is used as the heat-proof coating on the inner wall of the rocket nozzle, it can withstand the instantaneous high temperature of thousands of degrees. The silicone rubber has a continuous service life under high temperature.
2. Ozone aging resistance, oxygen aging resistance, light aging resistance and weather aging resistance function
The properties of silicone rubber vulcanized rubber have no obvious change after being exposed to sunlight for several years in free state.Comparison of ozone aging resistance of silicone rubber and other rubber.
3. Electrical insulation function
The electrical insulation function of silicone rubber vulcanized rubber changes little when it is exposed to moisture, frequency changes or temperature increases, and the natural silica is still an insulator after combustion.In addition, there are fewer carbon atoms in the molecular structure of silicone rubber, and carbon black is not used as filler, so it is not easy to char when arc discharge, and it is very reliable in high pressure situations.Its corona resistance and arc resistance is very good, corona resistance life is 1000 times of PTFE, arc resistance life is 20 times of fluorine rubber.
4. Special surface function and physiological inertia
The surface of silicone rubber is smaller than most organic materials, with low moisture absorption, long-term immersion in water water absorption rate is only about 1%, the physical function does not decline, mildew prevention function is good, and many materials do not bond, can play an isolation role.Silicone rubber odorless, non-toxic, no adverse effects on the human body, and body tissue reaction slightly, has excellent physiological inertia and physiological aging.
5. High air permeability
Compared with other polymer materials, silicone rubber has good permeability, and the permeability of nitrogen, oxygen and air at room temperature is 30 ~ 40 times higher than that of NR.It is selective for gas infiltration and exudation, for example, the permeability of carbon dioxide is about 5 times that of oxygen.
6. Biomedical functions The properties of silicone rubber's molecular structure give it excellent biomedical functions, as demonstrated by the successful application of a large number of animal and human experiments.
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