In the late 1990s, the demand for high-performance fire-retardant cable for sale rubber was increasing, especially the development of the overhead cable industry and auto parts manufacturing industry, which drove the consumer demand for rubber-based CPE. Rubber CPE is a special synthetic rubber with excellent comprehensive performance, heat-resistant oxygen ozone aging, and good flame retardancy. Mainly used in: wire and cable (cables for coal mines, wires specified in UL and VDE standards), hydraulic hoses, automotive hoses, tapes, rubber sheets, PVC profile pipe modification, magnetic materials, ABS modification, etc.
Among them, the application mainly has the following functions:
1) Reinforcing filling system
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 are the most commonly used plasticizers for CPE, such as dioctyl phthalate (DOP) and dioctyl adipate (DOA). Their solubility parameters are close to CM and their compatibility is good. DOA and DOS are used in rubber compounds to give them excellent cold resistance.
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 (important)
CPE is a saturated rubber, and the general common sulfur vulcanization system cannot effectively vulcanize it. The thiourea system is the earliest application of CPE curing system. The most effective one is Na-22, but Na-22 has a slow curing speed, poor aging performance, and high compression set. Moreover, Na-22 is a serious carcinogen. Produces an unpleasant smell, and its use abroad has been restricted.