What affects the resilience of silicone rubber
1. The vinyl content in methyl vinyl silicone rubber is insufficient or the vinyl content of the raw rubber itself is unevenly distributed, so that the rubber does not reach the positive sulfur point during vulcanization, the vulcanization speed is too long, the vulcanization is not sufficient, and the elasticity of the rubber is poor. The overall vinyl content in the rubber can be increased, and an appropriate amount of hydrogenated silicone oil can be added to the formula, and the amount of filler can be reduced to increase the amount of rubber to solve the problem of poor resilience and slow vulcanization speed; you can also use raw rubber with different types of vinyl content, and use a small amount of high vinyl raw rubber to control the permanent deformation of the rubber at break. Find an optimal balance point in the formula to avoid the brittleness of the rubber, so as to achieve the purpose of improving the elasticity of the rubber.
2. The vinyl content in the rubber is insufficient or the vinyl content of the raw rubber itself is unevenly distributed, so that the rubber does not reach the positive sulfur point during vulcanization, the vulcanization speed is too long, the vulcanization is not sufficient, and the elasticity of the rubber is poor. The problem of poor rebound resilience and slow vulcanization speed can be solved by increasing the overall vinyl content in the rubber, adding an appropriate amount of hydrogenated silicone oil to the formula, reducing the amount of filler and increasing the rubber content; different types of ethylene raw rubber can also be used with a small amount of high vinyl raw rubber to control the permanent deformation of the rubber at break. An optimal balance point should be found in the formula to avoid the brittleness of the rubber to achieve the purpose of improving the elasticity of the rubber.
3. The acidity of the rubber itself is also an important factor leading to poor rebound resilience and slow vulcanization speed of the rubber. Since white carbon black itself is acidic, and the added structure control agent is mostly acidic, the rubber is acidic. The acidic rubber has a delayed effect on vulcanization, and the high temperature resistance will also decrease. The acid content of the rubber can be improved by adding appropriate weak alkaline substances. Generally, the pH value of the rubber is in the neutral or weak alkaline range, which is good for improving elasticity and vulcanization speed.

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