Rubber Seal Some Reasons For Aging
Rubber seals are a kind of common base element in a sealing device that plays a very important role in the contradiction between leakage and sealing. Solve the problem of leakage and sealing in the course of human conquest of nature. Has been promoting technological progress, to prevent and reduce environmental pollution an important way. Rubber seals are a class of rubber products widely used in sealing technology. Because the rubber has a valuable elastic polymer material, a wide temperature range, given a small stress in different media will have a greater deformation, this deformation can provide contact pressure to compensate for leakage gap, to achieve the purpose of sealing The The main products are rubber seals, rubber gaskets, flange gaskets, rubber shock absorbers, rubber O-ring, V-ring, X-ring, Y-ring, and other forms, size, color, hardness and Material rubber products, although our rubber seal products started relatively slow, but with the social progress, the emergence of new sealed production equipment and technology, the technical requirements of the sealing products more and more harsh, so as to further promote the development of new products and Development.
Rubber performance characteristics are mainly three: First, excellent flexibility and flexibility; Second, good resistance to breathability and resistance to a variety of chemical media and electrical insulation, not easy to deformation; Third, with a variety of materials can be used, compound, produce Comprehensive performance.
Some Reasons for the Aging of Rubber Seals
1, the role of heat, improve the temperature can cause silicone rubber products, thermal cracking or thermal crosslinking. But the basic role of heat or activation. Increase the rate of oxygen diffusion and activation of oxidation, thereby accelerating the rate of oxidation of rubber, which is a common phenomenon of aging - thermal oxygen aging.
2, the role of oxygen, oxygen in the rubber with the rubber molecules free radical chain reaction, molecular chain fracture or excessive cross-linking, resulting in changes in the performance of silicone rubber products. Oxidation is one of the important reasons for the aging of rubber.
3, the reason for light, the shorter the light, the greater the energy. The damage to the rubber is the high energy of the UV. In addition to UV can directly lead to the rubber molecular chain of the fracture and cross-linking, the rubber due to the absorption of light energy generated free radicals, trigger and accelerate the oxidation chain reaction process. The outside light plays the role of heating. Another feature of the role of light (different from the heat) is that it is mainly in the rubber surface and health. High rate of plastic samples, both sides will appear reticular cracks, the so-called "light outer crack."
4, the role of ozone, ozone, chemical activity of oxygen is much higher, more destructive, it is also the molecular chain fracture, but the role of ozone on the rubber with the rubber deformation or not different. When used as a deformed rubber (mainly unsaturated rubber), there is a crack in the direction of the stress acting, that is, the so-called "ozone cracking"; when the rubber is deformed, only the oxide film is formed on the surface without cracking.
5, the role of mechanical stress, repeated mechanical stress, the rubber molecules will break the formation of free Tsuen, triggering oxidation chain reaction, the formation of chemical process. Mechanical fracture molecular chain and mechanical activation oxidation process. How can a dominant, depending on the conditions in which it depends. In addition, under the action of stress easily lead to ozone cracking.
6, other reasons there are chemical media, variable metal ions, high-energy radiation, electricity and biological.