The three major factors of silicone material affecting product vulcanization and tensile resilience

In the production process of silicone products, silicone molding and all aspects have certain factors, but to ask which aspect of the reasons occupy the main problem point, or to control from the production link, but from which link is the most difficult to control then it is certainly the raw materials, so when the raw materials are wrong, we should look for the source of silicone materials - next reason!

Reasons 1:
The vinyl content in the silicone material is not enough or the vinyl content of the raw rubber itself is not evenly distributed, so that the silicone does not reach the positive sulfur point during vulcanization, the vulcanization rate is too long, the vulcanization is not comprehensive and insufficient, resulting in poor silica gel rebound.
The solution:
The poor resilience and slow vulcanization rate can be solved by increasing the overall vinyl content of silica gel and adding appropriate amount of hydrogen-containing silicone oil into the formula to reduce the amount of filler and increase the amount of silica gel. It can also be used with different types of vinyl content of raw rubber, with a small amount of high vinyl raw rubber to control the tensile permanent deformation of silicone, formula to find an optimal balance, in order to avoid the occurrence of brittle silica gel material to achieve the purpose of improving elasticity.

Reason 2:
The silicone material itself is acidic, which is also an important factor leading to poor silica gel resilience and slow vulcanization rate. Because the white carbon black itself is acidic, and the added structure control agent is mostly acidic, the silica gel is acidic, and the acidic silica gel has a delayed effect on vulcanization, and the high temperature resistance will also decrease.
The solution:
The acidic content of the silica gel material can be improved by adding appropriate weak alkaline substances, and the PH value of the general rubber is in the neutral or weakly alkaline range to improve the elasticity and vulcanization rate.

Reason 3:
The addition of too much plasticizer or structure control agent in silica gel has delayed vulcanization effect on silica gel, resulting in poor silica gel resilience and slow vulcanization rate.

The solution:
Raw rubber with narrow molecular weight distribution and certain volatile components can be selected to improve the release of silicone products, thereby reducing the amount of plasticizer; When the surface of white carbon black is treated with alkoxysilane, it is used with hydroxyl silicone oil, and the two-step method is used to make the white carbon black molecule and the raw rubber molecule have a certain combination reaction time, and the process can take health care to reduce the amount of structural control agent, so as to improve the resilience and vulcanization speed of silica gel.
In addition, the establishment of a standard vulcanization curve for each type of silica gel is also a means to control the stable production quality of the compound.