EPDM (Ethylene Propylene Diene Monomer) is a copolymer of ethylene, propylene and a small amount of non-conjugated diene. It is a kind of ethylene propylene rubber. Composition, only contains unsaturated double bonds in the side chain, so it has excellent aging resistance such as ozone resistance, heat resistance, and weather resistance, and can be widely used in automotive parts, waterproof materials for construction, wire and cable sheaths, heat-resistant hoses, tapes , Automotive seals and other fields.
The most important feature of EPDM is its superior oxidation resistance, ozone resistance and corrosion resistance. Since EPDM belongs to the polyolefin family, it has excellent vulcanization characteristics. Among all rubbers, EPDM has the lowest specific gravity and can absorb a large amount of fillers and oils with little effect on properties, so that low-cost rubber compounds can be made.
EPDM rubber is a terpolymer of ethylene, propylene and non-conjugated dienes. Dienes have a special structure. During the copolymer reaction, only one active double bond participates in the reaction, while the remaining double bond with less activity remains on the copolymer molecular chain as an unsaturation point for supply. Sulfur vulcanization was used . Only one of the two bonds can be copolymerized, and the unsaturated double bond is mainly used as a cross-link. The other unsaturated will not become the polymer backbone, only side chains. The main polymer chain of EPDM is fully saturated. This property makes EPDM resistant to heat, light, oxygen, and especially ozone. EPDM is non-polar in nature, resistant to polar solutions and chemicals, has low water absorption, and has good insulating properties.
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Post time: Mar-15-2023