Silicone Rubber Unveiled: Mastering Heat-Vulcanization for Unparalleled Performance

How are you,my friends,today we will talk a new topic,which is about the”Silicone Rubber Unveiled: Mastering Heat-Vulcanization for Unparalleled Performance”.Yes, as you can imagine, today we are still discussing about silicone rubber related technology. That’s right, after that, if you have no other requests for our topic, we may discuss the hot issues related to silicone rubber.Okay,lets begin our todays topic!

Silicone rubber can be classified into three categories based on different vulcanization mechanisms: thermal vulcanization, room temperature vulcanization, and addition reaction. This discussion will primarily focus on heat-vulcanized rubber.

One of the key features of silicone rubber is its exceptional temperature resistance, spanning from -100 to 350 degrees Celsius – the widest range among all rubber types. Specifically, vinyl silicone rubber or low phenyl silicone rubber, when properly matched, can maintain elasticity even after aging for thousands of hours at 250 degrees Celsius or hundreds of hours at 300 degrees Celsius. Notably, its glass transition temperature is -140 degrees Celsius, and the vulcanized rubber remains elastic at temperatures as low as -70 to -100 degrees Celsius. For applications such as heat-resistant coatings on rocket nozzles, silicone rubber proves its resilience against instantaneous high temperatures in the thousands.

Silicone rubber exhibits remarkable resistance to ozone aging, oxygen aging, light aging, and weathering. After exposure outdoors for several years, the vulcanizate undergoes minimal performance change. Furthermore, its electrical insulation performance remains stable in the presence of moisture, frequency variations, or temperature fluctuations. The silica produced after combustion serves as an insulator, and silicone rubber’s molecular structure, low in carbon atoms and absent of carbon black fillers, mitigates the risk of scorch during arc discharge. This makes it highly reliable in high-voltage scenarios, with outstanding corona resistance and arc resistance, surpassing other materials in longevity.

The material’s surface properties are distinctive, characterized by low surface energy and minimal hygroscopicity, leading to only about 1% water absorption after long-term immersion. Silicone rubber demonstrates excellent mold resistance, non-adherence to various materials, and an isolating effect. In terms of safety, it is odorless, non-toxic, exhibits no adverse effects on the human body, and displays outstanding physiological inertia and aging resistance.

Silicone rubber’s high breathability sets it apart from other polymers, with permeability for nitrogen, oxygen, and air at room temperature being 30-40 times higher than that of natural rubber. It exhibits selectivity in gas penetration, with oxygen permeability for carbon dioxide being about five times higher.

Its unique molecular structure imparts excellent biomedical properties to silicone rubber, validated through successful applications in numerous animal and human experiments. These characteristics collectively position silicone rubber as an unparalleled material in various industrial applications, showcasing its resilience, insulation properties, surface qualities, and biomedical performance.

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