Compressive properties of vulcanizate heat resistance depends on the rubber type and Crosslinking structure and density, as well as test conditions. Filler, plasticizer, antioxidant and other compounding ingredients followed by effects.
Accordingly, we should note in the design formula is:
1, cross-linked structure, disulfide can decompose poor heat resistance, high sulfur and low promotion system should be avoided. Single s bond, decomposition temperature, good heat tolerance, so sulfur curing try to use low sulphur systems. Decomposition of carbon-carbon bonds higher temperatures, heat better, so could use DCP-S system is the best.
2, Crosslinks density Crosslinking density, permanent deformation is slight. Permanent deformation due to viscous flow between a molecular chain caused cross-links can prevent the sliding, reduced permanent deformation.
At design time, you can increase the amount of curing system to enhance the Crosslinking density, ZnO+ stearic acid dosage increases it will be appropriate to raise the crosslink density. Using peroxide is adding xlpe additives will also be very helpful.