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Six reasons for the aging phenomenon of rubber seals_Rubber Seal_Rubber Seal Manufacturer

by:ORK      2022-11-21
Six reasons for the aging phenomenon of rubber seals 1. The role of oxygen: Oxygen reacts with rubber molecules in a free radical chain reaction in the rubber seal, and the molecular chain is broken or excessively cross-linked, causing changes in the performance of silicone rubber products. Oxidation is one of the important reasons for rubber aging. The effect of heat: increasing the temperature can cause thermal cracking or thermal crosslinking of silicone rubber products. But the basic effect of heat is activation. Improve the oxygen diffusion rate and activate the oxidation reaction, thereby accelerating the oxidation reaction rate of rubber, which is a common aging phenomenon - thermal oxygen aging. 2. The effect of moisture: The effect of moisture has two aspects: silicone rubber products are easily damaged when exposed to rain in humid air or immersed in water. This is because the water-soluble substances in the rubber seals and the components such as clear water and water are extracted by water. dissolve. Especially under the alternating action of water immersion and atmospheric exposure, the damage of rubber seals will be accelerated. However, there are also cases where moisture does not damage the rubber seals and even delays aging. 3. The role of ozone: The chemical active oxygen of ozone is much higher and more destructive. It also breaks the molecular chain, but the effect of ozone on rubber varies with whether the rubber is deformed or not. When applied to deformed rubber (unsaturated rubber), cracks in the direction of stress, so-called 'stress cracks', occur. When applied to non-deformed rubber, only an oxide film is formed on the surface without cracking. 4. The reason of light: The shorter the light wave, the greater the energy. The damage to the rubber is the ultraviolet rays with higher energy. In addition to directly causing the rupture and cross-linking of the rubber molecular chain, ultraviolet rays generate free radicals due to the absorption of light energy, which initiates and accelerates the oxidation chain reaction process. Light also has a heating effect on the seal, but unlike (heat effect), light can cause network cracks in rubber seals with high glue content, the so-called 'external cracks'. 5. Mechanical stress: Due to the viscosity of the polymer, the relaxation process of the sealing ring is too late to complete during the deformation cycle, and then enters the next deformation cycle, causing the internal deformation of the rubber sealing ring to increase continuously. When the stress is large, the molecular chain breaks to generate free radicals, which triggers the oxidation chain reaction of the rubber seal molecules; when the rubber seal ring is repeatedly deformed, its mechanical stress will weaken the atomic valence force in the molecular chain of the rubber seal, so lowers its activation energy for oxidation reactions. The oxidative cracking reaction of rubber seal molecules is accelerated. The reduction of the oxidation activation energy is the end of the process of converting mechanical energy into chemical energy during the fatigue process; when the rubber seal is repeatedly deformed, a hysteresis phenomenon occurs, causing internal friction, so that heat is generated inside the rubber material, thus accelerating the rubber seal. oxidation chain reaction. 6. Other effects: There are other electrochemical corrosion, radiation and biological effects. Previous:Three measures to keep rubber seals seals intact for a long time
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