Method for continuously synthesizing epichlorohydrin rubber by using kneading reactor

Abstract

The invention provides a method for continuously synthesizing epichlorohydrin rubber by using a kneading reactor. The method comprises the following steps of: sequentially adding a predetermined amount of toluene, a monomer and a catalyst into a kneading reactor, starting stirring, heating to start a reaction, continuously adding materials into the kneading reactor through a feeding pump accordingto a set feeding ratio, continuously discharging, preparing a glue solution by adopting a process of material and catalyst feeding at a medium temperature, continuous feeding and continuous polymerization reaction, carrying out devolatilization treatment, sending the devolatilized rubber solution to a gel kettle for gelling to obtain rubber particles, removing surface water from the rubber particles through a vibrating screen, drying the rubber particles in an oven, carrying out extrusion molding on the dried raw rubber, metering and packaging the raw rubber, and carrying out post-treatment to obtain the epichlorohydrin rubber. The kneading reactor is used for continuously synthesizing the epichlorohydrin rubber, the working volume and the heat transfer area are large, the heat transfer surface has a self-descaling function, and the method has the advantages of being high in mass transfer rate, simple in reaction operation, few in side reaction, high in raw material utilization rate and good in product quality.

Description

technical field [0001] The invention relates to the field of rubber manufacture, in particular to a method for continuously synthesizing epichlorohydrin rubber by using a kneading reactor. Background technique [0002] Epichlorohydrin rubber (also known as epichlorohydrin rubber, epichlorohydrin rubber or epichlorohydrin rubber) is made of polymer grade epichlorohydrin (or a mixture of comonomers such as ethylene oxide) in the presence of triisobutyl aluminum It is made by polymerization in toluene solution in the presence of a catalyst as the main component. Chlorohydrin rubber has excellent oil resistance, solvent resistance, acid resistance, alkali resistance, weather resistance and ozone resistance, its gas permeability resistance is the lowest among all rubber types, and its shock absorption performance and high and low temperature resistance are outstanding. It can work at 120°C for a long time, and its low temperature resistance can reach -30°C. In addition, it also ...

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Problems solved by technology

[0013] In order to overcome the existing solution polymerization method for synthesizing chlorohydrin rubber, the stirring and mixing efficiency of the tank reactor is low, the reaction time is long, the temperature rise of the polymerization is too large, and the polymerization The temperature is difficult to control, the molecular weight distribution of the rubber is wide, and the performance is unstable. The present invention proposes a method for continuously synthesizing chlorohydrin rubber using a kneading reactor.

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