When some people use rubber sealing rings, they have encountered the cracking and hardening of sealing rings. What are the reasons for the aging of rubber sealing rings? The aging of rubber sealing rings will cause some sealing rings to lose their sealing effect.
The rubber seal ring is made of rubber, so what is the reason for the aging of rubber seal ring products? In the production process of rubber seal ring, the physical and chemical properties and mechanical properties of rubber gradually deteriorate due to the combined effect of internal and external factors, resulting in loss of use value. This change is called rubber aging. The surface is cracked, sticky, hardened, softened, powdered, discolored and moldy. The specific factors are as follows.
A. Heat: the rise of temperature causes the rubber material of the seal ring to crack, resulting in chemical oxidation reaction and accelerating the rubber oxidation reaction;
B. Light: The shorter the light wave, the greater the energy. Ultraviolet rays with high energy destroy the rubber sealing ring. In addition to directly causing the breakage and cross-linking of rubber molecular chains, ultraviolet rays also cause free radicals in the rubber of rubber sealing rings due to the absorption of light energy, which initiates and accelerates the oxidation chain reaction process.
C. Oxygen: the oxygen reacts with the rubber molecules in the rubber by free radical chain reaction, and the molecular chains are broken or over crosslinked, causing the change of the rubber seal ring performance. Oxidation is one of the important reasons for rubber aging.
D. Ozone: The chemical active oxygen of ozone is much higher and more destructive. It also breaks the molecular chain. However, the effect of ozone on rubber varies depending on whether the rubber seal ring is deformed or not.
E. Moisture: The rubber seal ring is easy to be damaged when it is exposed to the rain in humid air or immersed in water. This is because the water-soluble substances in the rubber and the components such as clear water Tsuen Tuan are extracted and dissolved by water.
F. Mechanical stress: under the repeated action of mechanical stress, the molecular chain of the rubber seal ring will break and generate free spring, which will lead to oxidation chain reaction. Under the action of stress, it is easy to cause ozone cracking.
