Differences in three materials of NR CR EPDM for automotive multi wedge belts

The automotive multi wedge belts made of these materials have their own characteristics and advantages and disadvantages. The following are their main differences:

Neoprene: Chloroprene (i.e. 2-chloro-1,3-butadiene) is the main raw material α- Synthetic rubber produced by polymerization. Neoprene is mainly used in the automotive field to manufacture weathering resistant products, viscose soles, coatings and rocket fuels. Its disadvantage is that it is flammable and hardens and ruptures under low temperature conditions.

EPDM rubber (EPDM): It is a copolymer of ethylene, propylene and a small amount of non conjugated Diene. It is a kind of Ethylene propylene rubber, represented by EPDM (Ethylene Propylene Diene Monomer). EPDM rubber is mainly used in the automotive field to manufacture waterproof materials, wire and cable sheaths, heat resistant hose, tape, automotive seals and other fields. It has excellent performance in ozone resistance, heat resistance, weather resistance, etc., but its solubility parameters account for δ= From 9.2 to 9.41, soluble in toluene, xylene, dichloroethane, and ethylene trivanadate, slightly soluble in acetone, methyl ethyl ketone, ethyl acetate, and cyclohexane, insoluble in n-hexane and solvent gasoline, but soluble in a mixed solvent composed of appropriate proportions of good and bad solvents, as well as non solvent or bad solvent and non solvent.

Polyurethane (PU): its full name is poly (Carbamate), which is a high molecular compound. Polyurethane has two main categories: polyester and polyether. They can be made into polyurethane plastic (mainly foam plastic), polyurethane fiber (called spandex in China), polyurethane rubber and elastomer. Soft polyurethane is mainly a linear structure with thermoplastic properties. It has better stability, chemical resistance, resilience, and mechanical properties than PVC foam materials, and has smaller compression deformation. Good insulation, sound insulation, seismic resistance, and gas resistance. Therefore, it is used as a packaging, sound insulation, and filtering material. Rigid polyurethane plastics are made by polymerization of polyesters containing hydroxyl groups and diisocyanate compounds. They have excellent elasticity and strength properties and can be processed and molded, making them widely used in the automotive industry.

In the application scenarios of automotive multi wedge belts, different materials will be selected as the manufacturing raw materials for multi wedge belts based on different usage environments and performance requirements.