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Six reasons for accelerated aging of rubber seals_Rubber Seal_Rubber Seal Manufacturer

by:ORK      2022-11-28
Six reasons for accelerated aging of rubber seals 1. Oxygen in the rubber produces free radical chain reaction with rubber molecules, and the molecular chain is broken or excessively cross-linked, causing changes in the performance of rubber seals. Oxidation is one of the important reasons for the aging of rubber seals. 2. Ozone has much higher chemical activity than oxygen and is more destructive. Ozone also causes the molecular chain to break, but the effect of ozone on rubber seals varies with the deformation of the rubber. When used for deformed rubber seals (mainly unsaturated rubber seals materials), it will cause cracks perpendicular to the direction of stress action, that is, so-called ozone cracks. 3. Increasing the temperature can cause thermal cracking or thermal crosslinking of rubber seals. But the basic of thermal energy is activation. Improve the oxygen diffusion rate and oxidation reaction effect, thereby accelerating the oxidation reaction rate of rubber materials, which is a common aging phenomenon - thermal oxygen aging. 4. The shorter the light wave, the greater the energy. It is ultraviolet rays with higher energy that have a damaging effect on rubber materials. Ultraviolet rays can directly cause the rupture and cross-linking of the rubber molecular chain, and the rubber seals will absorb light energy to generate free radicals, which will initiate and accelerate the effect of the oxidation chain reaction. Ultraviolet light has a heating function. Another characteristic of the action of light (different from the action of heat) is that it is mainly carried out on the surface of the rubber material. The samples with high glue content will have network cracks on both sides, that is, the so-called light outer layer cracks; 5. Under the continuous repeated action of mechanical stress, the rubber molecular chain of the rubber seal will be broken to generate free radicals, which will trigger an oxidation chain reaction and form a mechanochemical process. In the process of mechanical breakage of molecular chains and mechanical activation and oxidation, which one is dominant depends on the conditions. In addition, it is easy to cause ozone cracking under the action of stress. 6. There are two aspects of moisture effect: rubber seals are easily damaged when exposed to rain in humid air or immersed in water. This is because the water-soluble substances and water groups in rubber are extracted and dissolved by water. due to hydrolysis and absorption. Especially under the interaction of water immersion and atmospheric exposure, the destruction of rubber material molecules will be accelerated. However, in special cases, moisture does not damage the molecules of the rubber material, and even has the effect of delaying aging.
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