EPDM rubber hose is made of EPDM as raw material. It is a tubular rubber product used to transfer gas, liquid, slurry or granular materials. EPDM hose inherits the weather resistance of EPDM material, and can withstand light, ozone, humidity and heat to a certain extent for a long time. But do you know why its weather resistance changes? Let’s take a look:
First of all, we need to understand the reason why EPDM has excellent weather resistance.
EPDM rubber is a copolymer composed of ethylene, propylene and a small amount of non-conjugated diolefin, etc.
From the perspective of chemical structure, the main chain of EPDM is composed of saturated hydrocarbons with relatively stable chemical properties, and only some side chains have a small amount of unsaturated and active chemical double bonds.
Therefore, the molecular chain structure of EPDM is very stable and the degree of unprotection is low, which is that EPDM itself is more difficult to be affected by illumination and ozone in the environment.
So what can we do to improve the weather resistance of EPDM?
You can start with the diolefin content. From the above, we can say that the weather resistance of EPDM rubber is related to those unsaturated double bonds, namely, diolefin. With the decrease of the content of diolefin, the weather resistance of EPDM rubber hose is gradually enhanced. So choose those diolefin content small rubber hose.
In addition, you can also add some fillers, such as carbon black, to the raw material when making EPDM hose.
Carbon black is highly resistant to ultraviolet light and can absorb some amount of ultraviolet light. And the smaller the carbon black particles added, the greater the amount is, the stronger the weather resistance of the EPDM rubber hose produced.
However, this can only be used for the production of black, dark rubber hose when used.
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