Water has two aspects: the effect of rubber in the moist air in the rain, or soak in the water, and simple damage, this is because the rubber and water group composition such as water soluble substance in the extraction dissolved by water.
Hydrolysis or absorb the reason to cause.
Especially in water soaking and substitution effect of atmospheric exposure, can accelerate the damage of the rubber.
But in some cases the moisture effect on rubber is not damaged, there are even delay the aging effect.
The chemical activity of the ozone is much taller than oxygen, greater damage to the sex, it is also a cracking molecular chain attacks, but ozone condition on the effects of rubber is different according to the deformation of rubber or not.
When the effect on the deformation of rubber (
Mainly unsaturated rubber)
When presented with stress effect is the direction of the straight crack, the so-called 'ozone cracking';
Effect on the deformation of rubber, just appearance generates oxidation film but not cracked.
3: mechanical stress.
Under the effect of repeated mechanical stress, can make the rubber chain cracking generates free radicals, trigger a chain of oxidation reaction, a chemical process.
Mechanical cracking molecular chain and mechanical activation process.
Which can dominate, depending on its condition.
In addition, easy cause ozone cracking while under the effects of stress.
4: the light.
The shorter the light, the greater the energy.
For rubber is a high energy ultraviolet damage effect.
Ultraviolet (uv) in addition to directly result in the crack of the molecular chain of rubber and crosslinking, rubber by absorbing sunlight and free radicals, trigger and accelerate the process of oxidation of chain reaction.
Ultraviolet light plays a heating effect.
Another feature of the light effect,
Unlike thermal effect)
Is a major in rubber looks into it.
High rubber content of sample, the two sides can present the reticular crack, the so-called 'light outer crack'.
Progress in temperature can lead to thermal cracking of rubber or thermal crosslinking.
But the root of the heat effect is still the activation effect.
Progress oxygen dispersion speed and activated oxidation reaction, then speed up the rubber oxidation reaction, which is a kind of aging sign of widespread -
The hot oxygen aging.
Oxygen free radical in rubber and rubber molecules attack chain reaction, cracking molecular chain attack or excessive cross-linking, lead to rubber function changes.
Oxidation is one of the important reasons for rubber aging effect.
The effect factors of rubber and chemical medium, intending to metal ions, high-energy radiation, and electricity