How to distinguish the quality of steel wire hose
Rubber and its products in the process of processing, storage and use, due to the comprehensive effect of internal and external factors caused by rubber physical and chemical properties and mechanical properties gradually deteriorate, and finally lose the use value, this change is called rubber aging.
There are some factors affecting the aging of Rubber Air Hose:
Oxygen and oxygen
These gases in rubber occur free radical chain locking reaction with rubber molecules, molecular chain fracture or excessive crosslinking, resulting in changes in rubber properties. Oxidation is one of the important reasons of rubber air hose aging.
Ozone
Ozone chemical activity is much higher than oxygen, more destructive, it is also to make molecular chain fracture, but the effect of ozone on rubber with rubber deformation and different. When used for deformation of rubber (mainly unsaturated rubber), there is a vertical crack with the direction of stress action, that is, the so-called “ozone cracking”; When acting on the deformed rubber air hose, only the oxide film is formed on the surface without cracking.
Heat
It increase the temperature can cause thermal cracking or thermal crosslinking of rubber. But the basic function of heat is activation. Increase the oxygen diffusion rate and activation oxidation reaction, so as to accelerate the oxidation reaction rate of rubber air hose, which is a universal aging phenomenon — thermal oxygen aging.
Light
The shorter the light wave, the more energy it has. The damage to rubber is caused by higher energy ultraviolet light. In addition to uv can directly cause the fracture and crosslinking of rubber molecular chain, rubber air hose can produce free radicals due to absorption of light energy, and trigger and accelerate the oxidation chain reaction process. Ultraviolet light acts as heating. Another characteristic of photogenesis (as opposed to thermal) is that it mainly develops on the surface of rubber. The sample with high gel content will have network cracks on both sides, which is called “optical outer crack”.
Mechanical stress
Under the repeated action of mechanical stress, the rubber molecular chain will break into free radicals, trigger the oxidation chain reaction, and form a mechanical chemical process. Mechanical fracture of molecular chains and mechanical activation of oxidation processes. Which prevails depends on the conditions under which it is placed. In addition, it is easy to cause ozone cracking under stress.
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