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Preparation method of rubber promoter N-cyclohexyl-2-benzothiazole sulfonamide

The technology of benzothiazole sulfenamide and rubber accelerator is applied in the field of preparation of rubber accelerator, which can solve the problems of high energy consumption, low selectivity, complicated process and the like, and achieves reduction of sewage discharge, production cost and simple process. Effect

Inactive Publication Date: 2015-05-06
QINGDAO WANGYU RUBBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The industry mainly adopts the oxidative condensation of refined 2-mercaptobenzothiazole and cyclohexylamine to produce N-cyclohexyl-2-benzothiazole sulfenamide, but the process of producing refined 2-mercaptobenzothiazole is serious to environmental pollution, and the production cost High; the selectivity of the extraction method to produce refined 2-mercaptobenzothiazole is low, and the residue after recovering toluene contains a relatively large amount of 2-mercaptobenzothiazole, which requires large energy consumption and complicated procedures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0015] 1. Put crude 2-mercaptobenzothiazole with a mass ratio of 1:2.5 and cyclohexylamine with a mass fraction of 25% into the reaction kettle, stir and heat up to dissolve completely, cool down to 45°C, add sodium hypochlorite dropwise, drop for 1.5h added;

[0016] 2. Cool, filter with suction and wash away impurities with aqueous solution of cyclohexylamine, wash with water, and dry the filter cake to obtain N-cyclohexyl-2-benzothiazolesulfenamide.

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PUM

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Abstract

The invention discloses a preparation method of rubber promoter N-cyclohexyl-2-benzothiazole sulfonamide. The preparation method comprises following steps: step 1, crude 2-mercaptobenzothiazole and cyclohexylamine with a mass concentration of 25% are delivered into a reaction kettle at a mass ratio of 1:2.5, an obtained mixture is stirred and heated until complete dissolving is realized, and is cooled to 45 DEG C, and sodium hypochlorite is added dropwise for 1.5h; and step 2, an obtained mixed material is subjected to cooling, and pump filtration, impurities are removed via washing with cyclohexylamine aqueous solution, an obtained product is washed with water, and obtained filter cake is dried so as to obtain N-cyclohexyl-2-benzothiazole sulfonamide. According to the preparation method of rubber promoter N-cyclohexyl-2-benzothiazole sulfonamide, technology is simple, refining of crude 2-mercaptobenzothiazole is avoided, production cost is reduced greatly, and sewage discharge is reduced.

Description

[0001] technical field [0002] The invention relates to a preparation method of a rubber accelerator, in particular to a preparation method of N-cyclohexyl-2-benzothiazole sulfenamide. [0003] Background technique [0004] N-cyclohexyl-2-benzothiazole sulfenamide is a commonly used aftereffect accelerator, which has the advantages of good anti-scorch performance, fast vulcanization speed, safe processing, short vulcanization time, etc. It is mainly used for making tires, Rubber shoes, rubber hose, tape, etc. The industry mainly adopts the oxidative condensation of refined 2-mercaptobenzothiazole and cyclohexylamine to produce N-cyclohexyl-2-benzothiazole sulfenamide, but the process of producing refined 2-mercaptobenzothiazole is serious to environmental pollution, and the production cost High; the selectivity of the extraction method to produce refined 2-mercaptobenzothiazole is low, and the residue after recovering toluene contains a relatively large amount of 2-mercap...

Claims

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Application Information

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IPC IPC(8): C07D277/80
CPCC07D277/80
Inventor 梁松杰
Owner QINGDAO WANGYU RUBBER