As a new type of polymer material,ceramicized fire-resistant silicone rubber has important application value in the field of high-temperature protection,and its performance is closely related to the vulcanization process.The vulcanization process forms a three-dimensional network structure through cross-linking reaction,which directly affects the mechanical properties and high-temperature ceramicization effect of the material.The selection of different vulcanizing agents requires a comprehensive consideration of the balance between reaction activity,processing efficiency,and finished product performance.

 

　　

 

　　When using 2,4-dichlorobenzoyl peroxide(50%)as a vulcanizing agent,the recommended addition amount is 1.0%-1.5%,and crosslinking can be completed after 10 minutes of vulcanization at 130℃.This system has the characteristics of low-temperature rapid vulcanization,which can effectively reduce energy consumption and avoid the thermal impact of high temperature on the filler system.It is suitable for composite formulas that are sensitive to processing temperature.When using 2,5-dimethyl2,5-dihydroperoxide tert butyl hexane(45%),the addition amount can be reduced to 0.8%-1.3%,but it needs to be maintained for 10 minutes in a high temperature environment of 170℃.This high-temperature vulcanization system can promote the formation of a denser cross-linked network,which is beneficial for improving the initial heat resistance of the material and enhancing the stability of the inorganic skeleton during the ceramicization process.Both vulcanization processes require precise control of the addition ratio and process parameters,ensuring complete vulcanization to avoid residual initiators affecting flame retardancy and preventing excessive cross-linking leading to material brittleness.By optimizing the vulcanization system,silicone rubber can maintain flexibility at room temperature while forming a continuous and dense ceramic protective layer at high temperatures,achieving dynamic balance of fire and fire resistance functions.