Method of manufacturing halogenated rubber like polymer

Abstract

The present invention relates to a method for preparing halogenated rubber polymer, including reaction of unsaturated rubber polymer and halogenating agent. It is characterized by that said halogenation reaction is implemented in a closed drying system with screw extrusion press by adding raw material and additive and making them undergo the processes of plasticization, deaeration, softening, multistage halogenation, stabilizing, removing volatile matter and discharging material.

Description

technical field [0001] The invention relates to the field of producing synthetic rubber, in particular to a method for producing halogenated rubber-like polymers which does not pollute the environment and saves energy. Background technique [0002] Traditional and current production of halogenated butyl rubber or halogenated EPDM rubber, etc., all adopt the solution method, and its process route is divided into three types. The first method: the solid butyl or ethylene propylene rubber is made into a butyl rubber solution with a rubber content of about 15% (wt) in hexane or carbon tetrachloride in the preparation kettle, and then in the halogenation reaction kettle, with the added The gas phase or liquid phase halogen reaction, after halogenation, neutralize the by-product hydrogen halide and a small amount of excess halogen contained in the glue solution after halogenation, and then wash with a large amount of water to neutrality, recover the upper organic solution rubber p...

AI Technical Summary

Problems solved by technology

[0003] 1. In the halogenated stirred tank, the halogenated raw materials are solutions with a low concentration of 15-18% (wt) rubber solid content. Under the condition of a weight ratio of 1000:6 between a large amount of high-viscosity matter and a small amount of low-viscosity matter (gas or liquid), To complete the halogenation reaction, in addition to consuming a large motor power to enhance the stirring effect, the process operation cost is also high, and the overall reaction efficiency of this method is low, especially when bromine chlorination and bromination reactions are carried out at lower temperatures The disadvantage is more obvious

[0004] 2. Hydrogen halide, a by-product of the halogenation process, cannot be recycled, especially hydrogen bromide, which consumes a large amount of alkali, and produces a large amount of saline waste water and acid waste gas. One ton of product produces 10-25 tons of waste water, wasting water resources. And caused environmental pollution, this situation runs counter to the development of modern society

In addition, under the condition of hot alkaline water, the allyl halide on the halogenated rubber is prone to hydrolysis reaction, resulting in fluctuations in product quality

[0005] 3. The whole process is carried out in the presence of a large amount of water, resulting in serious corrosion of halogenated hydrogen acids. Pipelines, valves, equipment, instruments, pumps, electrical appliances and workshops, etc. must meet the requirements for preventing halogenated acids, so that the production equipment and The process becomes very complicated, and acid-resistant high-nickel alloys are also used, which greatly increases the total investment, and the operation, protection and maintenance costs are also greatly increased, resulting in high costs.

[0006] 4. In order to remove hydrogen halides, the entire production process is lengthened, and there are many auxiliary equipment, which increases the production operation cost and high energy and material consumption

Especially the use of chlorinated hydrocarbons as solvents, using the above-mentioned process, the solvent recovery rate is low, and the discharge into the atmosphere will destroy the ozone layer and seriously affect the environment on which human beings depend.

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