There are mainly the following methods to improve the heat resistance of silicone rubber
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(1) Introduce special groups (such as phenyl) in the side chain of silicone rubber molecules to prevent the oxidative degradation of the side groups and the thermal rearrangement degradation of the main chain;
(2) Introduce larger segments (such as phenylene, cyclodisilazane, carbodecaboryl) into the main chain of the silicone rubber molecule to improve the thermal stability of the cross-linked bond of the vulcanizate;
(3) Introduce heat-resistant additives (such as SnO2, Fe2O3, etc.) into the rubber formula system to prevent the main chain cyclization degradation and side chain oxidative cross-linking. Among them, the introduction of heat-resistant additives into the rubber formulation system is currently the most commonly used and effective method.
