Types of vulcanization of EPDM
EPDM is a copolymer of ethylene, propylene and a small amount of non-conjugated diene. It is composed of saturated hydrocarbons and only contains unsaturated double bonds in the side chain, so it has excellent aging resistance such as ozone resistance, heat resistance and weather resistance. It can be widely used in automotive parts, waterproof materials for construction, wire and cable jackets, heat-resistant hoses, tapes, automotive seals and other fields.
EPDM can be vulcanized with organic peroxides or sulfur, but compared with sulfur vulcanization, EPDM cross-linked with peroxides has higher temperature resistance when used in the wire and cable industry , lower compression set and improved cure characteristics, the downside of peroxide cure is the higher cost.
The cross-linking speed and vulcanization time of EPDM varies with the vulcanization type and content. When EPDM is mixed with butyl, natural rubber, and styrene-butadiene rubber, it is necessary to select the appropriate EPDM rubber. When selecting grades, the following factors must be considered:
When mixing with butyl, because butyl has a lower degree of unsaturation, in order to adapt to the vulcanization rate of butyl, a relatively low content of DCPD and EPDM with ENB content can be selected. When mixing rubber and styrene-butadiene rubber, EPDM with 8% to 10% ENB content can be selected to meet its vulcanization speed.
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