Continuous preparation process of nickel-series butadiene rubber and rare earth-series butadiene rubber

Abstract

The invention relates to a continuous preparation process of nickel-series butadiene rubber and rare earth-series butadiene rubber. The method comprises the steps: continuously introducing butyl oil and one of a nickel-series catalyst and a rare earth-series catalyst into a polymerization reaction unit of a polymerization device for polymerization reaction, to obtain a nickel-series or rare earth-series butadiene rubber solution, then introducing the rubber solution into a coagulation unit for coagulation, and thus obtaining the nickel-series or rare earth-series butadiene rubber, wherein thebutyl oil comprises a butadiene monomer and a solvent, the content of an oxygen-containing compound of the butyl oil is less than or equal to 20 mg / kg, and the water value of the butyl oil is less than or equal to 50 ppm. When the nickel-series butadiene rubber is prepared, the introduction of the rare earth-series catalyst is stopped, and the butyl oil and the nickel-series catalyst are introduced into the polymerization reaction unit; when the rare earth-series butadiene rubber is prepared, the introduction of the nickel-series catalyst is stopped, and the butyl oil and the rare earth-seriescatalyst are introduced into the polymerization reaction unit. Therefore, the flexible switching production of the nickel-series butadiene rubber and the rare earth-series butadiene rubber can be realized on the same polymerization device under the condition of not stopping to clean the kettle.

Description

technical field [0001] The invention relates to the technical field of butadiene rubber preparation, in particular to a continuous preparation process for nickel-based butadiene rubber and rare earth-based butadiene rubber. Background technique [0002] Butadiene rubber is a synthetic rubber with regular structure formed by the polymerization of butadiene monomer. According to different catalysts, it can be divided into nickel-based butadiene rubber, cobalt-based butadiene rubber, titanium-based butadiene rubber and rare earth (neodymium) Department) butadiene rubber. [0003] Although both nickel-based butadiene rubber and rare earth-based butadiene rubber can adopt the continuous solution polymerization process, due to the difference in the catalyst system between nickel-based catalysts and rare-earth-based catalysts, generally nickel-based butadiene rubber and rare-earth-based butadiene rubber use different For the production of the polymerization unit, even if the same ...

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Problems solved by technology

[0003] Although both nickel-based butadiene rubber and rare earth-based butadiene rubber can adopt the continuous solution polymerization process, due to the difference in the catalyst system between nickel-based catalysts and rare-earth-based catalysts, generally nickel-based butadiene rubber and rare-earth-based butadiene rubber use different For the production of the polymerization unit, even if the same set of polymerization unit is used for production, it is necessary to stop the polymerization unit and clear the kettle to switch the production of rubber types, which requires a lot of time, manpower and material resources

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