Rubber particles cause rubber aging

A) Oxygen: 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.
B) Ozone: Ozone chemical reactive oxygen is much higher, more destructive, it is the same to break the molecular chain, but the effect of ozone on rubber varies with rubber deformation or not. When used as a rubber for deformation (mainly unsaturated rubber), cracks appear in the direction of direct stress action, that is, the so-called "ozone cracking"; When acting on the deformed rubber, only the surface of the oxide film is formed without cracking.
C) Heat: 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.
D) Light: The shorter the light wave, the more energy. The damaging effect on rubber is the high energy ultraviolet light. In addition to directly causing the break and crosslinking of rubber molecular chains, ultraviolet rays can produce free groups due to the absorption of light energy, triggering and accelerating the oxidation chain reaction process. The external light acts as a heating agent. Another characteristic of the use of light (as opposed to heat) is that it is mainly produced on the surface of the rubber. The sample with high rubber content will have mesh cracks on both sides, that is, the so-called "outer layer crack rubber particles can be divided into black rubber particles and colored rubber particles, black rubber particles can be divided into 1-3mm black rubber particles, 1-2mm black rubber particles, 2-4mm black rubber particles according to specifications. Color rubber particles can be divided into green rubber particles, red rubber particles, blue rubber particles, white rubber particles, brown rubber particles, yellow rubber particles and other color rubber particles.