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Method of manufacturing halogenated rubber like polymer

A halogenated rubber and polymer technology, applied in the field of manufacturing halogenated rubber-like polymers, can solve the problems of low reaction efficiency, large motor power consumption, low solvent recovery rate, etc.

Active Publication Date: 2007-01-31
江苏圣杰实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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  • Method of manufacturing halogenated rubber like polymer

Examples

Experimental program
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Effect test

Embodiment 1

[0065] use figure 1 As shown in the process flow, the main equipment of the closed drying system in this embodiment is a reverse twin-screw extruder unit (reactor), the screw diameter is Φ36mm, and the length-diameter ratio L / D=60, except that the metering and discharging section is meshed , and the rest of the segments are non-meshing. The temperature of the cylinder is controlled in 10 sections. The cooling medium in the cylinder is 0°C white oil, and the outer cylinder is heated by an electric heating copper tile heating jacket. The raw material used is chopped solid butyl rubber pieces or long strips, and the maximum outline dimension or cross-section is less than 20mm. Add to the hopper of the screw crusher and plasticizer ③, the weight is 30kg, and its specification is a commercially available general-purpose butyl rubber with an unsaturation degree of 2% and Mooney 34. 0.01MPa pressure nitrogen gas is continuously fed into the lower part of the hopper, and the flow ra...

Embodiment 2

[0068] Use the same reactor closed drying system in Example 1. However, in this embodiment, the raw material is pumped from ⑤ into a hexane solution of butyl rubber with a solid content of 18% (wt), the dry rubber unsaturation is 2.2%, and the Mooney viscosity is 50. Under the protection of nitrogen positive pressure in the tank, the glue liquid flows out from the raw material buffer tank ⑥, is heated to 150 ℃ ~ 160 ℃ by the preheater ⑦, and enters the double-screw thickener ⑧, the solvent and a small amount of water are evaporated and recovered, The viscous solution concentrated to a solid content of about 70% is sent to the halogenation reaction system by the booster pump ⑩. Double-screw thickener ⑧ is a double-screw asynchronous co-directional concentration reactor with a diameter of Φ100 and L / D=10. Its jacket has a heating function to keep the polymer raw material at a high temperature, so as to enter the halogenation reaction and plasticize (mix) Before section ⑨, remov...

Embodiment 3

[0070] The same closed dry system and screw crushing and plasticizing machine ③ are used in Example 1, but the length-diameter ratio L / D of the screw extrusion reactor is 66, and a tail halogenation reaction section is added. The raw material is dicyclopentadiene-type EPDM rubber, the degree of unsaturation is 2.1%, and the Mooney viscosity is 75. The solid EPDM rubber is crushed into irregular blocks and strips less than 20mm in shape, and is added to the feed hopper of the screw crusher and plasticizer ③ at a frequency of 30kg per 90 minutes, and nitrogen is introduced from ② to remove the air. After ③ crushing and preliminary plasticization, it becomes a porous flocculent material, and dry nitrogen is continuously injected at ④ to reversely replace the air entrained by the material. Entering the plasticizing section ⑨ of the halogenation reactor, the material is heated and mixed with pure nitrogen, and the nitrogen containing water and oxygen is removed under reduced pressu...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F36/00C08F210/18C08F8/20B29C47/40B29C48/40B29C48/625
CPCB29B7/603B29B7/7495B29B7/845B29B7/86B29B7/726B29B7/823B29B7/826B29C48/625B29C48/40B29C48/022
Inventor 葛瑞思兰思祖安
Owner 江苏圣杰实业有限公司
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