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The Seven Factors Of Aging Of RUBBER GRADE Of CPE

Edit:Weifang Yaxing Chemical Co.,Ltd   Date:Jul 11, 2017

The seven factors of aging of RUBBER GRADE of CPE

A, oxygen

A) oxygen: oxygen in the CPE rubber class has A free radical chain reaction with RUBBER GRADE of CPE molecules, and the molecular chain is broken or over-crosslinked, causing A change in the performance of RUBBER GRADE of CPE. Oxidation is one of the important reasons for the aging of CPE rubber.

Second, the ozone

B) ozone: the chemical activity of the ozone is much taller than oxygen, more destructive, it is to make the same molecular chain break, but the role of ozone on RUBBER GRADE of CPE is different according to the level of CPE rubber deformation or not. When used as the RUBBER GRADE of CPE for deformation (mainly unsaturated RUBBER GRADE of CPE), there is a direct crack in the direction of stress, which is known as "ozone crack"; When the RUBBER GRADE of CPE of deformation is applied, only the surface of the CPE can be formed without cracking.

Three, thermal

C) heat: raising temperature can cause thermal cracking or heat crosslinking of RUBBER GRADE of CPE. But the basic effect of heat is activation. Increasing the rate of oxygen diffusion and activation of oxidative reaction, thereby accelerating the rate of oxidation of CPE rubber, which is a common phenomenon of aging - thermal oxygen aging.

Four, light

D) light: the shorter the light wave, the larger the energy. The damage to CPE rubber class is the high energy ultraviolet ray. In addition to the fracture and crosslinking of the RUBBER GRADE of CPE molecular chain, the RUBBER GRADE of CPE can generate free radicals due to absorption of light energy, and the process of oxidation chain reaction is accelerated. The action of heating by outside light. The other feature of the light is that it is mainly made on the surface of the rubber. With high adhesive rate, the two sides will have a network crack, which is known as the "outer crack".

5. Mechanical stress

E) mechanical stress: under the repeated action of mechanical stress, the RUBBER GRADE of CPE molecular chain can be fractured and formed free tsuen, causing the oxidation chain reaction to form the chemical process of the force. Mechanical fracture molecular chain and mechanical activation oxidation process. Which one can prevail, depending on the conditions of the place. In addition, it is easy to cause ozone to crack under stress.

Six, water

F) moisture, moisture has two aspects: the effect of RUBBER GRADE of CPEs in moist air in the rain or soak in the water, and easy to damage, this is due to the hierarchy of CPE rubber composition such as water soluble substances and hydrophilic groups dissolved by water extraction, hydrolysis or absorption causes. In particular, the alternating effects of water immersion and atmospheric exposure will accelerate the damage of RUBBER GRADE of CPE. However, in some cases water can not damage the CPE rubber level, and even delay the aging effect.

Seven, oil

G) RUBBER GRADE of CPE products in contact with oil medium to long-term use process, oil can infiltrate the RUBBER GRADE of CPE internal make its produce swelling, cause CPE rubber levels of strength and other mechanical properties reduced. Oil can cause swelling of CPE rubber class, because the oil seeps into RUBBER GRADE of CPE, and the molecular diffusion is produced, and the network structure of vulcanized glue is changed.