Technology for directly producing halogenated butyl rubber using butyl glue prepared by solution method

Abstract

The invention discloses a technology for directly producing halogenated butyl rubber using butyl glue prepared by a solution method. The technology sequentially comprises the four steps as follows: (I), synthetizing butyl rubber; (II), removing methyl chloride; (III), settling for separation; and (IV), halogenating the butyl rubber. Halogenated butyl rubber is prepared through a halogenating reaction of solution method butyl rubber. In a mixed solvent of alkane and the methyl chloride, the solution method butyl rubber is prepared by copolymerising isobutylene and isoprene positive ions, halogenated butyl glue is prepared by removing the methyl chloride, settling for separation and halogenating the butyl glue at low temperature. The detailed technology can be consulted on the specification. The technology of the invention has the advantages that the butyl rubber not only forms additional crosslinking positions after being halogenated, but also increases double bond reactivity, increases the curing speed of the butyl rubber, improves the co-curing behavior with unsaturated rubber, and increases the adhesiveness and the cure efficiency of metal and the rubber, thereby avoiding solvent switching or rubber stock dissolving of a slurry process.

Description

technical field [0001] The invention relates to a process for preparing halogenated rubber, in particular to a process for directly producing halogenated butyl rubber by preparing butyl glue in a solution method. Background technique [0002] Halogenated butyl rubber can be divided into two types: chlorobutyl rubber and bromobutyl rubber, which are butyl rubber with a certain degree of unsaturation in aliphatic hydrocarbons (such as hexane) and chlorine or Product of bromine reaction. The reaction is completed under strictly controlled conditions, so the original double bond in the butyl rubber molecule can be maintained, and the halogen is combined in the form of an allyl group. [0003] At present, Exxon and Lanxess prepare halogenated butyl rubber through slurry technology. The production process includes the synthesis of butyl rubber, the removal of unreacted monomers, the exchange of methyl chloride and good solvent, halogenation and neutralization after halogenation ...

AI Technical Summary

Problems solved by technology

However, this method easily degrades butyl rubber during processing and mixing, which brings difficulties in the processing process, and cannot prepare uniform and stable halogenated butyl rubber.

[0009] The production methods of butyl rubber mainly include slurry method and solution method. The preparation of butyl rubber and halogenated butyl rubber by slurry method technology is monopolized by EXXON Company of the United States and Lanxess Company of Germany. The preparation of butyl rubber by solution method technology in Russia Taoli Developed by Yadi Synthetic Rubber Company, there is no report on the direct preparation of halogenated butyl rubber by solution method technology

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