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Preparation method and application of butyl rubber solution

A technology of butyl rubber and halogenated butyl rubber, which is applied in the field of rubber preparation, can solve problems that are difficult to realize and affect the application of halogenated butyl rubber, and achieve the effect of reducing content and eliminating harmful halide derivatives

Pending Publication Date: 2022-05-06
NOVASHIN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the separation degree of monomer and n-hexane is lower than that of methyl chloride, it is difficult to control the concentration of monomer in butyl rubber glue to a low level, such as less than or equal to 50ppm, using ordinary distillation methods
At the same time, isobutylene and isoprene monomers are easy to react with halogens to generate more toxic halides. The halides generated by the residual monomers during the halogenation reaction will remain in the halogenated butyl rubber, affecting the quality of the halogenated butyl rubber. application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 19192kg / h butyl rubber n-hexane solution without methyl chloride, in which 0.019wt% isobutylene and 0.08wt% isoprene; the n-hexane solution of butyl rubber without methyl chloride enters the concentration tower, and the pressure at the top of the concentration tower is 130kPa , tower still 140kPa, tower still obtains the butyl rubber solution that the concentration of 10881kg / h improves, wherein the concentration of butyl rubber is 17.4wt%, isobutylene content 5ppm, isoprene 91ppm; 82 ℃ the butyl rubber solution that concentration increases from top Enter the stripping tower, and contact with the 160 ℃, 3500kg / h n-hexane gas entering the stripping tower from the lower part under the pressure of 150kPa, and the butyl rubber n-hexane solution 9116kg / h whose isoprene concentration is further reduced is obtained at the bottom of the tower, wherein Contains 20.7wt% of butyl rubber, 0 isobutylene and 5ppm isoprene.

Embodiment 2

[0039] Embodiment 1 obtains 9116kg / h butyl rubber n-hexane solution, under 50 ℃ and the n-hexane solution of 530kg / h bromine (wherein Br 2 91kg / h) contact reaction, the reaction product is neutralized by adding 10wt% NaOH aqueous solution, then enters the water precipitation coagulation tank, contacts with hot water and steam, and precipitates bromobutyl rubber particles, which then pass through the screw Bromobutyl rubber is obtained after dehydration by extruder, expander and drying oven.

[0040] The total bromine content in the product bromobutyl rubber was 2.28wt%.

[0041] Referring to GB 29987-2014 "Detection method for residual monomers in the appendix of gum base and its ingredients", no isoprene residue was detected, nor was the reaction product of isoprene and bromine detected.

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Abstract

The invention discloses a preparation method and application of a butyl rubber solution. The method comprises the following steps: carrying out gas stripping on a butyl rubber solution containing a small amount of isoprene to obtain a butyl rubber solution basically containing no isoprene. The isoprene-containing butyl rubber liquid is subjected to gas stripping by adopting hot alkane gas, so that the content of isoprene in the isoprene-containing butyl rubber liquid can be greatly reduced.

Description

technical field [0001] The invention belongs to the field of rubber preparation and relates to the preparation of butyl rubber and halogenated butyl rubber, in particular to a preparation method of butyl rubber solution and its application in the preparation of halogenated butyl rubber. Background technique [0002] Butyl rubber and halogenated butyl rubber, because of their excellent air tightness and aging resistance, have become important rubber materials for the manufacture of tires, medical rubber stoppers and other items. [0003] Industrialized butyl rubber production adopts slurry low-temperature cationic polymerization process, using isobutylene and a small amount of isoprene as reaction monomers, aluminum trichloride as catalyst, methyl chloride as diluent, and the concentration of reaction monomers is 10-20wt %, the polymerization reaction is carried out at a low temperature of about minus 100°C, and the polymerization product is suspended in methyl chloride to fo...

Claims

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Application Information

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IPC IPC(8): C08F6/10C08F8/22C08F210/12
CPCC08F6/10C08F8/22C08L23/22C08F210/12
Inventor 杨建春朱荣欣汪帆
Owner NOVASHIN CO LTD
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