Methyl Hydrogen Silicone Fluid Factory
Methyl Hydrogen Silicone Fluid
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According to information from the China National Intellectual Property Administration (CNIPA), a company recently filed a patent entitled Low Viscosity, Low Cyclosiloxane α,ω Dihydrogen Terminated Polydimethylsiloxane and Its Preparation Method. The publication number is CN122563083A, the application number is CN202610961581.8, the publication date is August 14, 2026, and the filing date is June 30, 2026.
The patent abstract indicates that the present invention provides a low viscosity, low cyclosiloxane α,ω dihydrogen terminated polydimethylsiloxane and its preparation method, falling within the technical field of organosilicon materials. The preparation method comprises: subjecting hydroxyl terminated polydimethylsiloxane oligomers to a dehydration polycondensation reaction in the presence of a thermoresponsive polyphosphazene based catalyst to produce high viscosity polydimethylsiloxane; wherein the thermoresponsive polyphosphazene based catalyst is a linear chlorophosphazene surface grafted with a thermoresponsive polymer; adding hydrogen containing disiloxane capping agent into the reaction system in 3 6 batches, and carrying out chain scission and grafting reactions under a gradient cooling procedure; after the reaction is completed, cooling the system to a temperature below the LCST (Lower Critical Solution Temperature) to deactivate the thermoresponsive polyphosphazene based catalyst, so as to obtain the target low viscosity, low cyclosiloxane α,ω dihydrogen terminated polydimethylsiloxane. By adopting the thermoresponsive polyphosphazene catalyst combined with the chain scission grafting reaction via batch feeding of hydrogen containing disiloxane capping agent and the gradient cooling procedure, the prepared hydrogen terminated silicone oil features low viscosity and low cyclosiloxane content, together with narrow molecular weight distribution, a small polydispersity index (PDI), high homogeneity and stable performance.
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