Preparation Method Of Hydrogen-containing Silicone Oil With Low Polymerization Degree

The preparation method of hydrogen-containing silicone oil with low polymerization degree mainly involves the selection of specific raw materials, the application of catalyst and the synthesis process steps. The following is an overview of a typical preparation method
First, raw material selection
Hydrogen-terminating agent: tetramethyldihydrodisiloxane is usually selected as the hydrogen-terminating agent, which can provide the required hydrogen-terminating group for the synthetic silicone oil.
Chain extender: DMC (dimethylcyclosiloxane), D4 (octamethylcyclotetrasiloxane) and other ring bodies are selected as chain extender to control the polymerization degree and molecular weight of silicone oil.
Second, catalyst application
Acid catalyst: In the synthesis process, acidic catalysts are needed to promote the ring-opening polymerization reaction. Although the traditional catalyst such as concentrated sulfuric acid is effective, it has some disadvantages such as corrosion equipment and environmental pollution. Therefore, it is possible to consider using resin catalysts such as Tulsimer®T-62 MP DRY, which have the advantages of easy separation, reusable products, and no acid odor.
Raw material mixing: the end hydrogen base sealing agent, chain extender and catalyst are mixed evenly according to a certain proportion.
Ring-opening polymerization: under the appropriate temperature and pressure, ring-opening polymerization reaction is carried out to produce hydrogen-containing silicone oil with low polymerization degree.
Product treatment: After the end of the reaction, the product is washed, filtered, decolorized, etc., in order to remove impurities and low boiling matter, and obtain pure hydrogen-containing silicone oil with low polymerization degree.
Reaction condition control: In the synthesis process, it is necessary to strictly control the reaction conditions such as temperature and pressure to ensure the smooth progress of the reaction and the quality of the product.
Catalyst selection: Select the right catalyst according to production needs and environmental requirements.
Product purification: The product is fully purified to improve the purity and quality of the product.
Through the above method, low polymerization degree and high quality hydrogen-containing silicone oil can be prepared to meet the needs of various applications.