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Method of manufacturing halogenated rubber like polymer

A halogenated rubber and polymer technology, which is applied in the field of manufacturing halogenated rubber-like polymers, can solve the problems of prone to hydrolysis reaction, a large amount of salty wastewater and acidic waste gas, and high energy and material consumption

Active Publication Date: 2009-11-11
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

[0064] 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-to-diameter ratio L / D=60, except that the metering and discharging section is meshing , and the rest of the segments are non-meshing. The cylinder body is divided into 10 sections for temperature control, the internal cooling medium of the cylinder is 0 ℃ 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 fragments or strips, and its maximum outline dimension or cross-section is less than 20mm. Add the hopper of the spiral crushing plasticizer ③, the weight is 30kg, its specification is unsaturation 2%, Mooney 34 commercially available general-purpose butyl rubber. In the lower part of the hopper, nitrogen gas with a pressure of 0.01MPa is continuously injected, and the flow ...

Embodiment 2

[0067] The same reactor as in Example 1 was used to close the drying system. But the raw material used in this embodiment is butyl rubber hexane solution with a solid content of 18% (wt) pumped from ⑤, the unsaturation of the dry glue is 2.2%, and the Mooney viscosity is 50. The inside of the tank is under the protection of positive nitrogen pressure. 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 concentrator 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 into the halogenation reaction system by the booster pump ⑩. Double-helix concentrator⑧, is a double-helix asynchronous and synchronous 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 higher temperature so as to enter the halogenation reaction for plasticizatio...

Embodiment 3

[0069] The closed dry system and screw crushing plasticizer ③ are exactly the same as in Example 1, but the length-to-diameter ratio L / D of the screw extrusion reactor is 66, and a halogenation reaction section at the end of a knot is added. The raw material is dicyclopentadiene-type EPDM rubber with an unsaturation of 2.1% and a Mooney viscosity of 75. The solid EPDM rubber is crushed into irregular blocks with a shape less than 20mm, and the frequency of 30kg is added to the feeding hopper of the screw crushing plasticizer ③ at a frequency of 90 minutes, and nitrogen gas is introduced from ② to remove the air brought in. After ③ crushing and preliminary plasticization, it becomes a small porous floc 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 d...

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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 an environment-friendly and energy-saving method for producing halogenated rubber-like polymers. Background technique [0002] The traditional and current production of halogenated butyl rubber or halogenated EPDM rubber, etc., all adopt the solution method, and there are three types of process routes. The first method: make solid butyl or ethylene-propylene rubber in the preparation kettle to make butyl and other rubber solutions with a hexane or carbon tetrachloride rubber content of about 15% (wt), and then in the halogenation reaction kettle, with the added Gas-phase or liquid-phase halogen reaction. After halogenation, it is washed with alkali to neutralize the by-product hydrogen halide and a small amount of excess halogen contained in the glue, and then washed with a large amount of water to neutrality. After washing, the upper organic solution rubber phase is rec...

Claims

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Application Information

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Patent Type & Authority Patents(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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