Preparation method of terminal hydrogen-containing silicone oil

Abstract

The invention relates to a preparation method of terminal hydrogen-containing silicone oil, which is characterized in that the terminal hydrogen-containing silicone oil is prepared by adopting high-viscosity methyl silicone oil and tetramethyldisiloxane as raw materials, and under the action of a linear phosphonitrile chloride composite catalyst H, the catalyst has a degradation effect on siloxane chain segments in methyl silicone oil chain segments, so that macromolecular polysiloxane is degraded into many micromolecular polysiloxane; meanwhile, the micromolecular polysiloxane is quickly subjected to condensation polymerization, the tetramethyldisiloxane participates in reaction and is terminated in time, the linear polysiloxane is redistributed, and the high-activity terminated hydrogen-containing silicone oil is prepared. According to the method disclosed by the invention, no obvious cyclosiloxane is generated, the content of low-boiling-point substances is extremely low, and only extremely trace short-chain polysiloxane is generated. The problems that in a traditional acid equilibrium catalysis process, the prepared target product is low in activity, low in effective component and excessive in residual low-boiling-point substances and ring bodies are well solved, and particularly, the limitation of international regulations such as reaction on the residual quantity of organic silicon ring body components such as D3, D4 and D5 in the product can be met.

Description

technical field [0001] The invention relates to the field of organic silicon softeners, in particular to a preparation method of terminal hydrogen-containing silicone oil. Background technique [0002] In recent years, silicone softeners have developed extremely rapidly, especially ternary copolymer block silicone oil is a new structure of silicone softeners that has developed the fastest in the past ten years. Terpolymer silicone oil combines polysiloxane segment, polyether segment and amino group on the same macromolecule. The polysiloxane segment mainly plays a smooth role, the polyether segment plays a self-emulsifying and hydrophilic role, and the amino group mainly plays a softening role. Compared with traditional softeners, it has more obvious linearity and excellent self-emulsifying properties. It can self-emulsify in water to form a stable emulsion, and its overall softening and finishing effect is very outstanding. [0003] As the basic raw material for synthesiz...

AI Technical Summary

Problems solved by technology

The experimental results prove that: concentrated sulfuric acid has the best catalytic performance in the preparation of hydrogen-containing silicone oil by acid balance catalysis, but it will generate more solid waste and be difficult to handle; acidic resin can simplify the process, but its stability is not good, and catalyst deactivation will occur phenomenon, affecting the performance of the product; activated clay is not conducive to production operations

Images