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What is silicone rubber? What are the main uses and features?

2023-01-09
Latest company news about What is silicone rubber? What are the main uses and features?

Silicone rubber refers to the main chain is composed of silicon and oxygen atoms alternately, silicon atoms are usually connected with two organic groups of rubber. Its molecular chain is composed of silicon atoms and oxygen atoms alternately (-SL-O-SL -), silicon oxygen bond energy is much larger than the general rubber carbon-carbon bond bond energy, which is one of the main reasons for the high thermal stability of silicone rubber. Ordinary silicone rubber consists mainly of a silico-oxygen chain with methyl and a small amount of vinyl. The introduction of phenyl can improve the high and low temperature resistance of silicone rubber, and the introduction of trifluoropropyl and cyanide can improve the temperature and oil resistance of silicone rubber. Silicone rubber has good low temperature resistance and can still work at -55℃. After the introduction of phenyl, -73℃ can be reached. Silicone rubber has good air permeability and oxygen permeability is the highest in synthetic polymers. In addition, silicone rubber also has the outstanding characteristics of physiological inertia, will not cause clotting, so it is widely used in the medical field.

(1) High and low temperature heat resistance

The temperature resistance of silicone rubber is very good, and the temperature range of silicone products is the widest (-100~350C). For example, properly matched vinyl silicone rubber or low phenyl silicone rubber can remain elastic after hot air aging at 250C for thousands of hours or 30OC for hundreds of hours; Low phenyl silicone rubber vulcanized rubber can remain elastic after tens of hours of hot air aging at 350C; Its glass transition temperature is -140℃C, and its vulcanized rubber is still elastic at the temperature of -70~100C. Silicone rubber can withstand instantaneous high temperature of thousands of degrees when it is used as thermal protection coating on the inner wall of rocket nozzle. Continuous service life of silicone rubber at high temperature.

(2) Ozone aging resistance, oxygen aging resistance, light aging resistance and weather aging resistance

The properties of silicone rubber vulcanizate have no significant 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 performance

The electrical insulation performance of silicone rubber vulcanized rubber changes little when exposed to moisture, frequency changes or temperature increases. The silica generated after combustion is still an insulator. In addition, the molecular structure of silicone rubber has fewer carbon atoms; And do not use carbon black as filler, so in the arc discharge is not easy to char, in high pressure occasions is very reliable. Its corona resistance and arc resistance is excellent, corona resistance life is 1000 times of PTFE, arc resistance life is 20 times of fluorine rubber.

(4) Special surface properties 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%, physical properties do not decline, good mildew resistance, and many materials do not bond, can play an isolation role. Silicone rubber tasteless, non-toxic, no adverse effects on the human body, and the body tissue reaction is slight, has excellent physiological inertia and physiological aging.

(5) High 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 to gas permeation, for example, the permeability of carbon dioxide is about 5 times that of oxygen.

(6) Biomedical performance

The properties of the molecular structure of silicone rubber make it have excellent biomedical properties. Silicone rubber is also widely used in the medical field. The most common is the successful application of silicone rubber medical tubes in a large number of animal and human tests.