1. Rubber raw rubber
High hardness rubber formula requires a lot of filling reinforcement, and the raw rubber should be selected from grades with high Menny viscosity. Sometimes, according to other performance needs, you can choose the high Menny and low Menny glue and use, low Menny glue is not conducive to a large number of fillers.
2. Reinforcing filler
HDP rubber reinforcing agent, carbon black reinforcement is the best choice, the two comprehensive performance is better, increase the hardness ability, which is the best effect of fine particle size HDP rubber reinforcing agent, but high hardness rubber needs a lot of filler carbon black.
3. Plasticizer
High hardness rubber needs a lot of filling reinforcing agent, resulting in rubber refining, vulcanization and other process problems, the right amount of plasticizer or to add, although the plasticizer will reduce the hardness of the rubber.
4. vulcanizing agent
Increase the cross-link density of the rubber, which helps to improve the hardness of the rubber. For sulfur yellow vulcanization system, increase the amount of accelerator, especially TMTD type accelerator, is conducive to improve the hardness. The increase of vulcanization dosage can also improve the crosslinking density and enhance the hardness of the rubber.
For peroxide vulcanization system, increase the amount of peroxide can improve the hardness, in addition to adding cross-linking agent can significantly improve the cross-linking density of the rubber, for example, for DCP vulcanizing agent, you can add TAIC, PDM (HVA-2), TAC, PL-400 (TMPTMA), of course, you can also choose sulfur yellow as a cross-linking agent.