CPE is a kind of non-self-reinforcing rubber, and it needs a reinforcing system to achieve better strength. Its reinforcing filling system is similar to general rubber. The reinforcing agent is mainly carbon black and white carbon black. White carbon black can improve the tear resistance of CPE, and it can form a meta-white system to improve the adhesion between CPE and the skeleton. . CPE has high filling properties, and the filling system mainly includes calcium carbonate, talcum powder, clay and so on.
2) Plasticizing system
Ester plasticizers and aromatic hydrocarbon plasticizers are the most commonly used plasticizers for CPE, such as dioctyl terephthalate (DOTP), dioctyl adipate (DOA), and trioctyl trimellitate , Aromatic oil, etc., their solubility parameters are close to CM, and their compatibility is good. Dioctyl phthalate (DOP) has been discontinued due to environmental issues. DOA and DOS are used in rubber compounds to give them excellent cold resistance. DOS is very suitable for situations where heat resistance and low temperature resistance are required at the same time.
3) Stable protection system
When CPE is heated or vulcanized (non-peroxide vulcanization system), hydrogen chloride will be released. Therefore, stabilizers with acid absorption should be used in the formulation, such as calcium stearate, barium stearate, tribasic lead sulfate or Magnesium oxide.
4) CPE curing system
CPE is a saturated rubber, and the common sulfur vulcanization system cannot effectively vulcanize it.