Hydrolysis and cross-linking process
1. Hydrolysis reaction:
• Certain silane groups (such as chlorosilane groups) in silicone oil can undergo hydrolysis reaction under the action of water to generate silanol groups.
• Hydrolysis reaction usually requires a certain temperature and acid or base catalysis.
2. Cross-linking reaction:
•The generated silanol groups can undergo condensation reaction to form silicon-oxygen-silicon bonds, thereby achieving cross-linking.
• The cross-linking reaction can transform silicone oil from a linear structure to a network structure, thereby improving its stability and heat resistance.
Factors affecting hydrolysis and cross-linking
1. Catalyst:
• Acids or bases can catalyze hydrolysis and cross-linking reactions, and different catalysts have an effect on the reaction rate and product structure.
2. Temperature:
• Increasing temperature can accelerate hydrolysis and cross-linking reactions, but too high a temperature may lead to side reactions.
3. Silicone oil structure:
• The type and number of functional groups, molecular weight, viscosity, etc. in silicone oil will affect its hydrolysis and cross-linking characteristics.
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