A continuous production system and production method of polysiloxane

Abstract

The invention relates to the technical field of silicone rubber production, in particular to a continuous production system and production method of polysiloxane. The continuous production system of polysiloxane comprises: a pre-mixer; a polymeric twin-screw extruder connected to the discharge port of the pre-mixer; The first vacuum system that links to each other; the static mixer that links to each other with the discharge port of described polymerization type twin-screw extruder; The second vacuum system connected to the vacuum port of the strip-type devolatilizer; the devolatilization type twin-screw extruder connected to the outlet of the strip-type devolatilizer; the devolatilization type twin-screw extruder The third vacuum system connected to the vacuum port of the extruder. The final polysiloxane produced has higher viscosity and lower volatile content.

Description

technical field [0001] The invention relates to the technical field of silicone rubber production, in particular to a continuous production system and production method of polysiloxane. Background technique [0002] On June 27, 2018, the European Chemicals Agency (ECHA) officially announced the addition of the 19th batch of 10 SVHC lists on its official website, including D 4 、D 5 and D 6 Included as Substances of High Concern, each individual content is required to be less than 0.1%. As the requirements for the level of environmental and health protection become higher and higher, reducing the potential risks of D4, D5 and D6 and providing risk reduction measures will transfer more to the manufacturers. [0003] The synthesis of ultra-high viscosity polysiloxane mostly adopts a catalytic equilibrium process, and the equipment used is a polymerization kettle. In order to obtain ultra-high viscosity polysiloxane, it is generally achieved by prolonging the polymerization t...

AI Technical Summary

Problems solved by technology

This preparation method has the following defects: 1) It has high requirements on the stirring system. As the viscosity of the polymer increases, the fluidity becomes poor, resulting in insufficient stirring, resulting in local overheating, crosslinking or yellowing

2) High viscosity, not easy to unload

[0004] Chinese patent application number 201310331091.2, the invention title is "The production method and production system of twin-screw continuous production of 107 rubber", which discloses that dimethylcyclosiloxane is dehydrated in a dehydration kettle, mixed with a static mixer to disperse the catalyst, and in a degrader Degradation, continuous production of 50,000 cp107 glue by screw devolatilization and discharge. In this patent, the screw machine devolatilizes the discharge, but the volatile matter produced is relatively high

Chinese Patent Application No. 200910193006.1, the invention name is "A Method for Preparation of Ultra-high Molecular Weight Polyorganosiloxane", which discloses a reactor with S-type stirring, with dimethylcyclosiloxane or α, ω -Dihydroxypolydimethylsiloxane is used as raw material to prepare ultra-high molecular weight polysiloxane in batches, and the volatile matter produced is also relatively high

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