The factors influencing the rebound and curing speed of the rubber mix and the solutions can be carried out from the following aspects:

① Insufficient vinyl content in the compound or uneven distribution of vinyl content in the raw rubber itself make the rubber unable to reach the positive sulfur point during vulcanization, the vulcanization speed is too long, and the vulcanization is insufficient, resulting in poor elasticity of the compound. It can increase the overall vinyl content in the rubber compound, add an appropriate amount of hydrogen containing silicone oil in the formula, reduce the filler amount, increase the rubber amount, and solve the problems of poor resilience and slow vulcanization; You can also use different types of raw rubber with vinyl content and a small amount of raw rubber with high vinyl content to control the tear and deformation of rubber. It is necessary to find a balance point in the formula to avoid the brittleness of rubber and achieve the purpose of improvement.

② The rubber itself is acidic, which is also an important factor leading to poor resilience and slow vulcanization of rubber. Because white carbon black itself is acidic, most of the added structure control agents are acidic, making the rubber more acidic. Acid rubber can delay vulcanization, and its high temperature resistance will also decline. The acid content of the rubber compound can be increased by adding appropriate weakly alkaline substances. Generally speaking, the PH value of the rubber compound is in the neutral or weak alkaline range, which is conducive to improving the elasticity and curing speed.

③ Other aspects: too much plasticizer or structure control agent is added to the rubber, resulting in poor rubber resilience and slow curing speed; Delayed vulcanization results in poor rubber resilience and slow vulcanization speed. The raw rubber with narrow molecular weight distribution and certain volatile content can be selected to improve the demoulding property of rubber, thus reducing the amount of plasticizer; Alkoxysilane is used to treat the surface of white carbon black, and it is used together with hydroxyl silicone oil. The two-step method can make the white carbon black molecules and raw rubber molecules have a certain binding reaction time. The process can reduce structure control agent. The dosage can achieve the purpose of improving the resilience and curing speed of rubber compound.
At the same time, a standard curing curve has been established for each type of rubber, which is also a means to control the stability of the quality of the rubber mixture.

For silicone rubber, please check the details:
https://www.siliconerubbers.net/product-general-grade-htv-silicone-rubber.html