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Several factors affecting the aging of plastic O-rings

by:ORK      2022-10-23
Several factors affecting the aging of plastic O ring manufactures A) Oxygen: Oxygen in the plastic O-ring produces a dispersed chain chemical reaction with the molecular structure of the rubber seals, and the molecular chain is cracked or excessively chemically cross-linked, resulting in the plastic O-ring Changes in functionality. Chemical action is one of the key causes of plastic O-ring aging. (B) Active oxygen: The organic chemical activity of active oxygen is much higher than that of oxygen, and it is more destructive. It also cracks the molecular chain, but the effect of O3 on plastic varies with whether the plastic is deformed. When used as a plastic for deformation (mainly unsaturated fatty plastic), a crack occurs in the direction of the pressure function, that is to say“Active oxygen cracking”; When acting on the deformed plastic, only the oxide film is formed on the surface without cracking. (C) Heat: Advance temperatures can cause catalytic cracking or thermochemical cross-linking of plastic O ring manufactures. However, the basic effect of heat is still the active effect. The rate of oxygen loosening and active redox reaction is accelerated, and then the rate of plastic redox reaction is accelerated, which is also a long-standing aging phenomenon thermo-oxidative aging. (D) Light: The less microwaves, the greater the kinetic energy. It is the ultraviolet light with higher kinetic energy that destroys the plastic O-ring. In addition to the direct drying and chemical cross-linking of the plastic molecular chain caused by ultraviolet light, the plastic absorbs light energy to generate a dispersing group, which leads to and accelerates the air oxidation chain reaction process. The external light plays a heating function. Another feature of the light effect (different from the heat effect) is that it grows on the surface of the oak. For specimens with high glue content, there will be network cracks on both sides, that is to say“photofissure”.
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