Degradation accelerator of polyorganosiloxane compound, its decomposition method by this decomposition promoter, and recovery method of decomposition product

摘要

1. TECHNICAL FIELD OF THE INVENTION;The present invention relates to a decomposition method for recovering and using waste polyorganosiloxane compounds, such as waste silicone rubber or waste silicon resin, and to a decomposition accelerator, a decomposition terminating agent, and a recovery method for decomposition products. .;2. The technical problem to be solved by the invention;Decomposing waste silicone rubber or waste silicone resin to obtain a low molecular weight decomposition product, and also a solid residue having a particle diameter of about 10 to 100 µm, preferably less than about 1 µm, that is, a surface-activated silica powder. In recovering.;3. Summary of Solution to Invention;Discarded polyorganosiloxane compounds, such as waste silicone rubber or waste silicone resin, may be prepared by decomposing an anhydrous secondary and / or 3 in the presence or absence of a decomposing agent such as an alkali metal or a hydroxide of an alkali metal or an alkoxide of an alkali metal and a saturated hydrocarbon. Efficiently decomposes the polyorganosiloxane compound by stirring, heating at normal pressure, or at normal pressure and at the same time with stirring in the presence of a primary aliphatic alcohol and a decomposition accelerator which does not contain or contain anhydrous primary aliphatic alcohol. To prepare a low molecular weight oily decomposition product in high yield and to recover a solid residue powder having an average particle diameter of about 10 to 100 µm, ie, silica powder, having a siloxane group and / or a hydroxyl group bonded to the surface thereof. 1 process, and furthermore, to the degradation product or to filtration and washing residues of the degradation product. Ultrasonic treatment by addition of the decomposition accelerator and the decomposition agent, followed by treatment with the decomposition terminator of the present invention, results in a siloxane group and / or on the surface of the oil phase decomposition product having a molecular weight much lower than the molecular weight of the decomposition product according to the first method. A second method of recovering an extremely fine solid residue powder, ie, silica powder, having an average particle diameter of less than about 1 μm with hydroxyl groups bonded thereto, and further comprising anhydrous secondary or tertiary anhydride with or without saturated hydrocarbons. Said decomposition promoter which is an aliphatic alcohol alone or a mixture thereof or a mixture of said anhydrous secondary and tertiary aliphatic alcohols and anhydrous primary aliphatic alcohols, and said mixture of an organohalosilane with or without an acid and an anhydrous apolar solvent. It is characterized by a decomposition terminator.;4. Important uses of the invention;Recovery and use of basic raw materials for manufacturing various products using various silicone rubbers, silicone resins, silicone oils and surface activated silica