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Method for preparing brominated butyl rubber

A technology of bromobutyl rubber and butyl rubber, which is applied in the field of its reaction process and device, solution halogenation method to prepare brominated butyl rubber, to achieve high mechanical properties, easy operation and good mechanical properties

Inactive Publication Date: 2012-03-21
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of supergravity technology, micro-reactor technology and other enhanced micro-mixing and mass transfer technologies to the process of preparing bromobutyl rubber by bromination substitution reaction has not been reported so far.

Method used

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  • Method for preparing brominated butyl rubber
  • Method for preparing brominated butyl rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] use figure 1 In the device shown, the reactor is a high-gravity rotating packed bed.

[0033] Add 8000ml of hexane solution A of butyl rubber into storage tank 1, the volume fraction of methylene chloride in solution A is 30%, the unsaturation of raw rubber is 1.82%, and the mass concentration of glue is 10%, add 29.15g 400ml of sodium hypochlorite aqueous solution per liter; 900ml of n-hexane solution B of liquid bromine is added in the storage tank 4, and the bromine elemental concentration is 31.2g / l; the materials in the storage tank 1 and the storage tank 4 are heated to 45°C respectively; And the volume flowmeter 3, the peristaltic pump 5 send the two streams of materials into the liquid premixing distributor of the supergravity reactor at a volume ratio of 10:1, and the mixed materials are sprayed into the rotor packing layer by the liquid distributor, and further mixed and Reaction; the material enters the stirred tank 7 through the liquid outlet of the rotatin...

Embodiment 2

[0035] The technological process and steps are the same as in Example 1, and the material ratio is also the same. The difference is that the concentration of the aqueous sodium hypochlorite solution used is 88.00g / l, the supergravity level is 20.12g, and the temperature is 30°C. The bromine content of the obtained bromobutyl rubber product is 1.91 (wt%), unsaturation 1.46%.

Embodiment 3

[0037] The technological process and steps are the same as in Example 1, and the material ratio is also the same, except that the supergravity level is 55.89g, the bromine content of the obtained bromobutyl rubber product is 1.93 (wt%), and the degree of unsaturation is 1.40%.

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Abstract

The invention discloses a method for preparing brominated butyl rubber, and belongs to the technical field of brominated butyl rubber. The method comprises the following steps that raw materials of a brominated butyl rubber solution and a bromine solution are added into a reinforced mixing reactor according to a ratio and undergo a replacement reaction of bromine on an allyl group, wherein stay time of the raw materials in the reinforced mixing reactor is controlled; and the products obtained by the previous step are fed into a stirring tank, are washed, are added with a stabilizing agent, are subjected to solvent flash evaporation, and are dried to form brominated butyl rubber products. The method realizes high-efficiency, large-scale, continuous and stable preparation of a brominated butyl rubber product having bromine content of 1.0 to 2.3 wt% and unsaturation of 0.6 to 1.6%, greatly reduces stay time, greatly reduces a reactor volume, and reduces a total operation cost.

Description

technical field [0001] The invention relates to a method for preparing bromobutyl rubber by a solution halogenation method, including its reaction process and device, and also relates to the expanded application of rapid microscopic mixing technologies such as high-gravity technology and micro-reactor technology in halogenation substitution reactions, belonging to bromine Technical field of butyl rubber. Background technique [0002] Halogenation is one of the best modification methods for butyl rubber. Brominated butyl rubber (BIIR) is the product of butyl rubber (IIR) halogenated by bromine. It not only has the excellent air tightness, heat resistance, aging resistance, corrosion resistance and electrical insulation of IIR, but also It makes up for the shortcomings of IIR in terms of vulcanization performance, adhesion, and compatibility with other rubbers, and has a wide range of applications in high-quality radial tires and medical rubber. [0003] The bromination reac...

Claims

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Application Information

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IPC IPC(8): C08F210/12C08F8/22
Inventor 陈建峰王伟邹海魁初广文赵宏
Owner BEIJING UNIV OF CHEM TECH
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