Today we discuss with you several reasons that cause rubber conveyor belt aging. In the process of using the conveyor belt, it is easy to item rubber layer aging, peeling phenomenon, continue reading for more information about the factors that affect rubber conveyor belting aging.
1. Ozone
The chemical activity of ozone is much higher than that of oxygen and more destructive, it also causes the molecular chain to break, but the effect of ozone on rubber varies with the deformation of rubber or not. When used in the deformation of rubber (mainly unsaturated rubber), there are cracks perpendicular to the direction of stress, the so-called "ozone cracking"; when the role of deformation of rubber, only the surface of the generation of oxide film and not cracking.
2. Temperature
Increase the temperature can cause thermal cracking or thermal cross-linking of rubber. But the basic effect of heat is still activation. Increase the rate of oxygen diffusion and activation of oxidation reaction, thus accelerating the rate of rubber oxidation reaction, which is a prevalent aging phenomenon - thermal oxygen aging.
3. Oxygen
Oxygen occurs in rubber with rubber molecules in the free base chain lock reaction, molecular chain breakage or excessive cross-linking, causing changes in rubber properties. Oxidation is one of the important causes of rubber aging.
4.Mechanical stress
Under the repeated action of mechanical stress and the continuous friction process with the roller, the belt will cause the rubber molecular chain to break and generate free radicals, which will trigger the oxidation chain reaction and form the force chemical process. The mechanical breaking of molecular chains and the mechanical activation of oxidation processes. Which can dominate, depending on the conditions under which they are located. In addition, it is easy to cause ozone cracking under stress.
5. Light
The shorter the light wave, the higher the energy. It is the higher-energy ultraviolet light that plays a destructive role for rubber. In addition to UV light directly causing the breakage and cross-linking of rubber molecular chains, rubber produces free radicals due to the absorption of light energy, which triggers and accelerates the oxidation chain reaction process. Ultraviolet light acts as a heating agent. Another characteristic of light action (different from heat action) is that it is mainly generated on the surface of rubber. Specimens with high gum content will have web-like cracks on both sides, which is called "light outer layer cracking".
6. Moisture
The role of moisture has two aspects: rubber in the humid air rain or immersion in water, easy to destroy, which is due to the rubber in the water-soluble substances and clear water groups and other components of the water extraction dissolved. Caused by hydrolysis or absorption, etc. Especially under the alternating effect of water immersion and atmospheric exposure, the destruction of rubber will be accelerated. But in some cases the water does not play a destructive role in rubber, and even has the effect of delaying aging.
7. Other factors
The role of factors on the rubber and chemical media, metal ions, high-energy radiation, electricity and biology. With the aging process of rubber, rubber performance gradually decline, and its practical value is gradually lost.
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