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Synthesis technique of brominated butyl rubber

A brominated butyl rubber and synthesis process technology, applied in the field of brominated butyl rubber synthesis process, can solve problems such as difficult product quality, high energy consumption, difficult control, etc., to reduce the probability of transposition side reactions, energy The effect of low consumption and simple equipment

Active Publication Date: 2014-06-25
ZHEJIANG CENWAY MATERIALS CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Specifically, in terms of reaction characteristics, the product bromobutyl rubber is prone to substituted bromine from the secondary position to the primary position in the presence of bromine and hydrogen bromide. To obtain high-quality products, it is necessary to block bromine and bromine in time. The direct contact between hydrogen hydride and the product; in terms of system operating characteristics, the viscosity of the alkane solution of the reactant butyl rubber is very high, the amount of bromine relative to the butyl rubber solution is very small, and the rapid mixing of the reactants is not easy to achieve. Process and microenvironment control is more difficult
At present, the synthesis of bromobutyl rubber is mainly carried out in strongly stirred tank reactors. On the one hand, this technology brings high energy consumption to the production process; Guarantee product quality without adding additives, which is the main reason why there is no important breakthrough in the synthesis process of bromobutyl rubber in my country

Method used

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  • Synthesis technique of brominated butyl rubber

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] according to figure 1 As shown in the flow chart, the concentration of butyl rubber is 25wt% n-hexane solution, Br 2 Concentration is 20wt% n-hexane solution, lye is 10wt% sodium hydroxide aqueous solution as raw material, wherein the unsaturation degree of butyl rubber is 1.9%, Br 2 The molar ratio of the double bond in butyl rubber is 0.7, NaOH and Br 2 The molar ratio is 1:1. The temperature of each feed is 30oC; The flow velocity in the follow-up pipeline of the first pipeline reactor is 0.3m / s, and the residence time is 60 seconds; The flow velocity in the follow-up pipeline of the second pipeline reactor is 0.3m / s, and the residence time is 300 seconds. The product bromobutyl rubber has a bromination degree of 2%, a secondary bromine content of 70%, a degree of unsaturation of 0.5%, a rubber number average molecular weight of 180,000 Daltons, and a molecular weight distribution PDI of 2.5.

Embodiment 2

[0020] according to figure 1 The flow chart shown, with butyl rubber concentration as 5wt% n-heptane solution, Br 2 The n-heptane solution with a concentration of 10wt% and the sodium hydroxide aqueous solution with a 2wt% lye are used as raw materials. The unsaturation of butyl rubber is 1.2%, and the Br 2 The molar ratio to the double bond in butyl rubber is 1.1, NaOH and Br 2 The molar ratio is 2:1. The temperature of each feed is 20oC; the flow velocity in the follow-up pipeline of the first pipeline reactor is 1m / s, and the residence time is 10 seconds; the flow velocity in the follow-up pipeline of the second pipeline reactor is 1m / s, and the residence time is 60 seconds . The product bromobutyl rubber has a degree of bromination of 0.8%, a secondary bromine content of 99%, a degree of unsaturation of 0.5%, a rubber number average molecular weight of 230,000 Daltons, and a molecular weight distribution PDI of 1.9.

Embodiment 3

[0022] according to figure 1 As shown in the flowchart, the concentration of butyl rubber is 5wt% n-octane solution, Br 2 The n-octane solution with a concentration of 2wt% and the aqueous sodium hydroxide solution with a 0.1wt% lye are used as raw materials. The degree of unsaturation of butyl rubber is 3.0%. Br 2 The molar ratio to the double bond in butyl rubber is 2.0, NaOH and Br 2 The molar ratio is 1.5:1. The temperature of each feed is 60oC; the flow velocity in the follow-up pipeline of the first pipeline reactor is 2m / s, and the residence time is 6 seconds; the flow velocity in the follow-up pipeline of the second pipeline reactor is 2m / s, and the residence time is 20 seconds . The degree of bromination of the product bromobutyl rubber is 1.2%, the secondary bromine content is 99%, the degree of unsaturation is 1.2%, the number average molecular weight of the rubber is 220,000 Daltons, and the molecular weight distribution PDI is 2.3.

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Abstract

The invention discloses a synthesis technique of brominated butyl rubber, belonging to the technical field of rubber synthesis. The technique comprises two serial processes comprising bromination of butyl rubber and neutralization of brominated mixture solution. According to the technique, alkane solution of bromine is mixed with alkane solution of butyl rubber in a pipeline reactor, subjected to the bromination, remained for 6s-60s in the subsequent pipeline, introduced into alkali liquor by another pipeline reactor, subjected to the neutralization, and remained for 20s-300s in the subsequent pipeline, then the reaction is finished. The technique has the following characteristics of high reaction speed, short reaction time and exact control, and is suitable for inhibiting the transformation from secondary-bromine substituted principal product to primary-bromine substituted side product; and each index of the obtained product is excellent.

Description

technical field [0001] The invention belongs to the technical field of rubber synthesis, and in particular relates to a synthesis process of brominated butyl rubber. technical background [0002] With the development of science and technology, chemical engineering technology is constantly developing in the direction of high efficiency, energy saving and safety. In order to achieve the goal of sustainable development and comprehensive utilization of resources and energy, new requirements are put forward for the chemical production process. In 1937, Exxon Company prepared butyl rubber. In 1953, people developed the bromination method of butyl rubber. Compared with traditional butyl rubber, brominated butyl rubber has better heat resistance, acid and alkali resistance, vulcanization activity, and other properties. It has obvious advantages in rubber blending and regeneration performance, and is the main raw material for high-grade automobile inner tubes. With the development o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/12C08F8/22
Inventor 骆广生任纪文吕阳成代俊明王凯
Owner ZHEJIANG CENWAY MATERIALS CO LTD
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