Suction Cups Internal and external factors
Rubber and its products in the processing, storage and use of the process, due to the comprehensive effect of internal and external factors caused by the physical and chemical properties of rubber and mechanical properties of the gradual deterioration of the final loss of use value, this change is called rubber aging. On the surface of the performance of cracks, sticky, hardening, softening, powder, discoloration, long mold and so on. What are the factors that affect the aging of rubber? Oxygen: Oxygen in the rubber with the rubber molecules free radical chain reaction, molecular chain fracture or excessive cross-linking, causing changes in rubber properties. Oxidation is one of the important reasons for the aging of rubber.
Moisture: There are two aspects of moisture: the rubber in the humid air rain or soak in the water, easy to damage, it is due to the rubber in the water-soluble substances and water and other components of the water is extracted by water. Hydrolysis or absorption and other causes. Especially in the water immersion and atmospheric exposure of the alternating effect, will accelerate the destruction of rubber. But in some cases the moisture can not damage the role of rubber, and even delay the role of aging.
Ozone: Ozone is much higher and more destructive, it is also the molecular chain of rupture, but the role of ozone on the rubber with the rubber deformation or not different. When used as a deformed rubber (mainly unsaturated rubber), there is a crack in the direction of the stress acting, that is, the so-called "ozone cracking"; when the rubber is deformed, only the oxide film is formed on the surface without cracking.
Hot: Raising the temperature can cause thermal cracking or thermal crosslinking of the rubber. But the basic role of heat or activation. Increase the rate of oxygen diffusion and activation of oxidation, thereby accelerating the rate of oxidation of rubber, which is a common phenomenon of aging - thermal oxygen aging.
Mechanical stress: under the repeated mechanical stress, the rubber molecular chain will break the formation of free Tsuen, lead to oxidation chain reaction, the formation of chemical process. Mechanical fracture molecular chain and mechanical activation oxidation process. How can a dominant, depending on the conditions in which it depends. In addition, under the action of stress easily lead to ozone cracking.
Light: the shorter the light, the greater the energy. The damage to the rubber is the high energy of the UV. In addition to UV can directly lead to the rubber molecular chain of the fracture and cross-linking, the rubber due to the absorption of light energy generated free radicals, trigger and accelerate the oxidation chain reaction process. By the outside light plays the role of heating. Another feature of the role of light (different from the heat) is that it is mainly in the rubber surface and health. High rate of plastic samples, both sides will appear reticular cracks, the so-called "light outer crack."
Other: the role of the rubber there are chemical medium, variable metal ions, high-energy radiation, electricity and biological.