What are the external factors that affect rubber aging?

1, oxygen in rubber with rubber molecules free base chain reaction, molecular chain fracture or excessive crosslinking, causing rubber properties change. Oxidation is one of the important reasons for rubber aging.

2, the chemical activity of ozone is much higher than oxygen, more destructive, it is also to break the molecular chain, but the effect of ozone on rubber with rubber deformation or not is different. When the rubber is used for deformation, cracks appear in the direction of direct action with the stress, that is, the so-called "ozone cracking"; When acting on the deformed rubber, only the surface of the oxide film is formed without cracking.

3, increasing the temperature can cause thermal cracking or thermal crosslinking of rubber. But the basic function of heat is activation. Increasing the oxygen diffusion rate and activation oxidation reaction, thereby accelerating the rubber oxidation reaction rate, which is a universal aging phenomenon - hot oxygen aging.

4, the role of water has two aspects: rubber in wet air rain or long-term immersion in water, easy to destroy, this is due to the water-soluble substances in rubber and hydrophilic groups and other components are dissolved by water extraction, hydrolysis or absorption and other reasons. Especially under the alternating action of water immersion and atmospheric exposure, the destruction of rubber will be accelerated. However, in some cases, the moisture does not damage the rubber, and even has the effect of delaying aging.