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Factors of endangering embrittlement of insulating rubber sheet
After a period of application, the insulating rubber sheet will become brittle. The following is an analysis of the factors endangering the embrittlement of the insulating rubber pad
1: Water content
The actual effect of moisture has two levels: rubber is easily destroyed when it is drenched in wet gas or soaked in water, because the water-soluble chemicals and cold water functional groups in rubber are extracted and dissolved by water. It is caused by hydrolysis reaction or digestion and absorption. Especially under the actual effect of water immersion and air exposure, the damage of rubber will be accelerated. However, in some cases, water can not destroy the actual effect of rubber, and even has the actual effect of delayed embrittlement.
2: In situ stress of mechanical equipment
Under the effect of repeated in-situ stress of mechanical equipment, the molecular structure chain of rubber will split, the components will disperse, the oxidation chain reaction will be caused, and the organic chemical process will be formed. Mechanical equipment cleavage molecular structure chain and mechanical equipment active oxidation process. Which one will prevail depends on the standard to which it belongs. In addition, it is easy to cause active oxygen cracking under the actual effect of in-situ stress.
3: Reactive oxygen species
The organic chemical specificity of reactive oxygen species is much higher than that of oxygen species, and its destructiveness is higher. It also causes the molecular structure chain to crack, but the actual effect of reactive oxygen species on rubber varies with whether the rubber is deformed or not. When the actual effect is applied to the deformed rubber (mainly unsaturated fatty rubber), it shows a crack which is straight with the actual effect of in-situ stress, that is to say, "active oxygen cracking"; When applied to the deformed rubber, only the surface is transformed into oxide film without cracking.
4: Light
The less light waves, the greater kinetic energy. The actual effect on rubber is ultraviolet light with high kinetic energy. Apart from the fact that UV light can immediately cause the molecular structure chain cracking and chemical cross-linking of the rubber, the rubber can digest and absorb solar energy to produce dispersion groups, which can cause and accelerate the oxidation chain reaction process. Ultraviolet light has the practical effect of heating. Another characteristic of the light effect (different from the heat effect) is that it depends on the surface of the rubber. For the specimens with high adhesive content, reticular cracks will appear on both sides, which means "smooth surface cracks".
5: Oxygen
Oxygen in the rubber molecular structure through the dispersion chain reaction, molecular structure chain cracking or excessive chemical cross-linking, resulting in the modification of rubber effect. The actual effect of oxidation is one of the key reasons for rubber embrittlement.
6: Heat
The development temperature can cause catalytic cracking or thermochemical crosslinking of rubber. But the actual effect of hot pressing is still the actual effect of activity. The development of oxygen dispersion rate and active oxidation reaction, followed by accelerated rubber oxidation reaction rate, is a common phenomenon of embrittlement hot oxygen embrittlement.
7: Others
The actual effect factors of insulating rubber sheet also include organic chemicals, metal ions, higher energy radiation sources, electricity and microorganisms.
The above aspects are the elements of the embrittlement of the insulating rubber sheet. Therefore, in ordinary applications, the above elements should be prevented from touching the insulating rubber sheet for a long time as far as possible, so as to increase the service life of the insulating rubber sheet.