The preparation technology of fluorosilicone oil mainly includes a variety of methods, among which hydrosilylation reaction and polymerization reaction method are the two most common ones.
Hydrosilylation reaction refers to the addition reaction of compounds containing Si-H bonds and compounds containing unsaturated bonds (such as C=C bonds) under certain conditions under the action of a catalyst. This method can introduce other groups to change the properties of fluorosilicone oil and expand its application range. Generally, platinum complexes are selected as catalysts, and long-chain fluorosilicone oil can be prepared by controlling the reaction conditions.
The polymerization reaction method is divided into bulk polymerization, emulsion polymerization and solution polymerization according to different polymerization methods. Taking bulk polymerization as an example, trifluoropropylmethylcyclotrisiloxane is usually used as a raw material, and a polymerization reaction is carried out under the action of a catalyst. The fluorosilicone oil prepared by this method has the advantages of narrow molecular weight distribution and stable performance.
In addition, hydrolysis condensation preparation method and ring-opening condensation preparation method are also the main methods for preparing hydroxyl fluorosilicone oil. The hydrolysis condensation method has a simple process, but there are problems such as wide molecular weight distribution and unstable hydroxyl groups. The ring-opening condensation method improves the stability of the hydroxyl group by improving the catalyst and reaction conditions, and prepares hydroxyl fluorosilicone oil with stable viscosity.
In general, the preparation technology of fluorosilicone oil is constantly developing, and various methods have their own advantages and disadvantages. The specific method to be selected depends on the performance and use of the required fluorosilicone oil.