Method for preparing hydroxyl-terminated linear polysiloxane by adopting reverse hydrolysis method

The invention relates to the technical field of chemical engineering, and particularly provides a method for preparing hydroxyl-terminated linear polysiloxane by adopting a reverse hydrolysis method. According to the preparation method, a secondary hydrolysis method is adopted, and deionized water is dropwise added into an alkoxy silane monomer in two stages for a hydrolytic condensation reaction. The biggest advantage of preparing the hydroxyl-terminated linear polysiloxane by using the reverse hydrolysis process method of secondary hydrolysis is that the process optimizes the water consumption required during hydrolysis, and after optimization, the water consumption is only 1/10-1/6 of the water consumption of a known preparation method. By reducing the water amount required during hydrolysis, the product purification step can be simplified, and the operation is convenient. And the hydroxyl-terminated linear polysiloxane can be prepared by the process, for example, phenyl hydroxyl-containing silicone oil ca