Process overview
The preparation process of low hydrogen silicone oil mainly includes the following steps:
Preparation of raw materials: The main raw materials include purified dimethylchlorosilane (DMCS), hydrochloric acid (HCl), etc.
Hydrolytic condensation reaction: In the presence of HCl catalyst, DMCS hydrolyzes with water to form dimethylsilanediol (DMSD), which further condensates to form polydimethylsiloxane (PDMS) chain.
Dehydration cyclization: The PDMS chain removes water through dehydration reaction, and open-loop and closed-loop reactions occur to form circular PDMS molecules.
Hydrogenation reduction: PDMS are treated with hydrogen to reduce their hydrogen content, a step that helps reduce volatile byproducts in subsequent reactions.
Fractionation and purification: The reaction mixture is fractionated, the silicone oil with high boiling point is separated according to the boiling point, and the impurities are removed by filtration or centrifugation, and the purified low hydrogen silicone oil is finally obtained.
Application principle
The application principle of low hydrogen silicone oil is mainly based on the activity of silicon-hydrogen bonds (Si-H bonds) in its molecules. Under the action of the catalyst, these active groups can react with a variety of other active groups (such as double bonds, hydroxyl groups, etc.) to generate modified silicone oil or silicone rubber products with specific properties.
Crosslinking agent: In the preparation process of silicone rubber, low hydrogen content silicone oil as a crosslinking agent, under the action of catalyst and silicone rubber molecular chain crosslinking reaction, forming a three-dimensional network structure, improve the mechanical properties and heat resistance of silicone rubber.
Waterproof agent: low hydrogen-containing silicone oil can be crosslinked into a film at low temperature under the action of metal salt catalyst to form a dense waterproof layer, which is widely used in the waterproof treatment of fabrics, glass, ceramics and other materials.
Softener and feel agent: In the textile industry, low hydrogen silicone oil is used as softener and feel agent, which can significantly improve the softness and feel of fabrics.
Lubricant: In sewing thread and chemical fiber spinneret and other occasions, low hydrogen silicone oil is used as a lubricant, which can improve production efficiency and product quality.
In summary, low hydrogen silicone oil is prepared by its unique process and plays an important role in many fields based on the active groups in its molecules.
