Preparation method of rubber accelerator CBS

A rubber accelerator and accelerator technology, applied in the field of rubber accelerator CBS preparation, can solve the problems of restricting the process of large-scale production, high water treatment costs, low product yield, etc., and achieve cost saving, process safety, and salt-containing low rate effect

Pending Publication Date: 2021-02-26
HEBI HENGLI RUBBER PLASTIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reaction equipment of this method is relatively simple, the reaction conditions are mild, the process route is mature, the process is easy to control, the product yield is high, the cost is low, and the benefit is good. The cost is high, so the industry is looking for new ways to replace the process
The hydrogen peroxide oxidation method is popular because no salt is produced during the reaction process, but the product yield is low, which restricts the process of its large-scale production

Method used

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  • Preparation method of rubber accelerator CBS

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preparation example Construction

[0021] The invention discloses a preparation method of a rubber accelerator CBS, the steps are as follows:

[0022] Step 1: mix a certain quality of accelerator M and a certain volume of water in the stirred tank and transport them to the reactor, add cyclohexylamine to the reactor and stir to generate M-cyclohexylamine salt;

[0023] Step 2: At a certain temperature, drop a certain volume of hydrogen peroxide into the reactor at a certain speed, then dropwise add sodium hypochlorite, use a display indicator to detect the end point of the oxidation reaction, and stop dripping sodium hypochlorite after the oxidation is completed;

[0024] Step 3: The reacted material is subjected to solid-liquid separation, washing and drying to obtain the finished product CBS.

[0025] After beating the accelerator M with water, mix it with cyclohexylamine in the kettle to ensure that the accelerator M reacts with cyclohexylamine to generate M-cyclohexylamine salt, and ensure that it fully rea...

Embodiment 1

[0035] The present embodiment provides the preparation method of rubber accelerator CBS of the present invention, specifically:

[0036] Put 500 kg of accelerator M and 1000 L of water into the stirring tank and mix evenly, and transport it to the reaction tank through the transfer pump, add the total mass of cyclohexylamine and cyclohexylamine to be 750 kg, stir for 2.0 h, and then control The temperature in the reaction kettle is 25-35°C, add 1000 L of hydrogen peroxide with a mass concentration of 8% to the reaction kettle dropwise, and the dropping speed is controlled at 400 L / h. % sodium hypochlorite, take the solution halfway and use starch potassium iodide and ammonium sulfate reagents to test, when the reagent turns blue, stop adding sodium hypochlorite dropwise, unload the reacted material into the solid-liquid separator, wash and separate, and dry the obtained solid semi-finished product The finished product CBS is obtained, and the obtained liquid is distilled to re...

Embodiment 2

[0038] The present embodiment provides the preparation method of rubber accelerator CBS of the present invention, specifically:

[0039] Put 500 kg of accelerator M and 1000 L of water into the stirring tank and mix evenly, transport it to the reaction tank through the transfer pump, add and recover the total mass of cyclohexylamine and cyclohexylamine to be 750 kg, stir for 1.5 h, and then control The temperature inside the reactor is 35-45°C, add 1000 L of hydrogen peroxide with a mass concentration of 9% to the reactor dropwise, and the rate of addition is controlled at 450 L / h. % sodium hypochlorite, take the solution halfway and use starch potassium iodide and ammonium sulfate reagents to test, when the reagent turns blue, stop adding sodium hypochlorite dropwise, unload the reacted material into the solid-liquid separator, wash and separate, and dry the obtained solid semi-finished product The finished product CBS is obtained, and the obtained liquid is distilled to reco...

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Abstract

The invention discloses a preparation method of a rubber accelerator CBS, which synthesizes the rubber accelerator CBS by using an accelerator M, cyclohexylamine and water as raw materials, hydrogen peroxide as a main oxidant and sodium hypochlorite as a secondary oxidant, and comprises the steps of firstly, mixing the accelerator M and water, pulping, mixing with cyclohexylamine, slowly dropwiseadding hydrogen peroxide at a certain temperature, and after a certain amount of hydrogen peroxide is dropwise added, dropwise adding sodium hypochlorite, detecting the end point of the reaction by using starch potassium iodide and an ammonium sulfate reagent, stopping dropwise adding sodium hypochlorite when the reagent becomes blue, then carrying out solid-liquid separation, drying the separatedsolid to obtain a rubber accelerator CBS, and distilling the separated liquid to recover cyclohexylamine. The melting point of the rubber accelerator CBS prepared by the method reaches 99 DEG C, theyield of the CBS can reach 98.2, and the method adopts normal-pressure operation and is simple, easy to implement, high in operability and high in safety.

Description

technical field [0001] The invention belongs to chemical technology, in particular to a preparation method of a rubber accelerator CBS. Background technique [0002] CBS is a commonly used rubber vulcanization accelerator, the chemical name is N-cyclohexyl-2-benzothiazole sulfenamide, its function is to significantly improve the physical properties and aging resistance of rubber products, excellent scorch resistance, and vulcanization The processing time is short and the processing is safe. At the same time, its discoloration is slight, it does not bloom, and the vulcanized rubber has good aging resistance, tensile strength and constant elongation. It is widely used in the manufacture of tires, rubber hoses, rubber shoes, wires and general industrial products. The sodium hypochlorite oxidation method is mainly used in China. The process is to mix the accelerator M with the aqueous solution of amine, and oxidize it with sodium hypochlorite as the oxidant. The reaction equipm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D277/80
CPCC07D277/80
Inventor 刘炤王延滨李杰阴军喜郭启发
Owner HEBI HENGLI RUBBER PLASTIC CO LTD
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