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Method for producing rubber vulcanization accelerator MBTS through air oxidation

A technology of rubber vulcanization and air oxidation, applied in electrolytic organic production, electrolytic components, electrolytic processes, etc., can solve the problems of high oxygen storage and transportation, high price, high pressure resistance, and high equipment requirements, and achieves large product particles, high melting point, The effect of reducing production costs

Active Publication Date: 2022-03-01
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method requires high equipment and high pressure resistance. In addition, the storage, transportation and price of oxygen are high, which is not conducive to production.

Method used

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  • Method for producing rubber vulcanization accelerator MBTS through air oxidation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Carbon is used as the anode electrode, platinum sheet is used as the cathode electrode, the voltage is set to 15V, and Zn(Ac) 2 as a catalyst, ammonia as an auxiliary agent, water as a solvent, and the reaction conditions are room temperature and normal pressure. Add 1.67 grams of 2-mercaptobenzothiazole into 5ml of water and stir continuously until it becomes a uniform slurry, and add a small amount of ammonia water (10 -4 mol) and catalyst Zn(Ac) 2 (2.19mg). Insert the carbon rod into the raw material, and at the same time blow the dry air to the carbon rod at a speed of 5m / s, power on and monitor the reaction progress under the condition of stirring. After reacting to 4 hours, the conversion rate of MBTS is about 40%. After 8 hours of reaction time, the color of the slurry changed from yellow to white and all floated on water, and the reaction was terminated to obtain 1.59 grams of white solid MBTS, with a yield of 95.6%. The initial melting point of the product d...

Embodiment 2

[0030] Carbon is used as the anode material, nickel is used as the cathode material, the voltage is set to 15V, and Zn(Ac) 2 as a catalyst, ammonia as an auxiliary agent, water as a solvent, and the reaction conditions are room temperature and normal pressure. Add 1.67 grams of 2-mercaptobenzothiazole into 5ml of water and stir continuously until it becomes a uniform slurry, and add a small amount of ammonia water (10 -4 mol) and catalyst Zn(Ac) 2 (10.95 mg). Insert the carbon rod into the raw material, and at the same time blow the dry air to the carbon rod at a speed of 5m / s, power on and monitor the reaction progress under the condition of stirring. When the reaction lasted for 3.5 hours, the conversion to MBTS was about 39.10%. After the reaction was carried out for 7 hours, the color of the slurry turned white and all floated on water, and the reaction stopped. Obtained 1.62 grams of white solid MBTS with a yield of 97.5%. The initial melting point of the product dete...

Embodiment 3

[0032] Carbon is used as the anode material, zinc is used as the cathode material, the voltage is set to 15V, and Zn(Ac) 2 as a catalyst, ammonia as an auxiliary agent, water as a solvent, and the reaction conditions are room temperature and normal pressure. Add 1.67 grams of 2-mercaptobenzothiazole into 5ml of water and stir continuously until it becomes a uniform slurry, and add a small amount of ammonia water (10 -4 mol) and catalyst Zn(Ac) 2 (21.9 mg). Connect the carbon electrode to the raw material, and at the same time blow the dry air to the carbon rod at a speed of 5m / s, power on and monitor the reaction progress under stirring conditions, and the conversion rate of MBTS is about 39.10% after 3 hours. After 6 hours, the color of the slurry turned white and all floated on water, and the reaction stopped. Obtained 1.6 grams of white solid MBTS, the conversion rate was 96.2%, and the initial melting point of the product detected by melting point apparatus was 164.3°C....

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Abstract

The invention discloses a method for producing a rubber vulcanization accelerator MBTS by air oxidation, which comprises the following steps: by taking air as an oxidant, carrying out electrocatalytic oxidation on an accelerator M in a water phase environment of alkali and a catalyst to obtain MBTS. The preparation method is simple in process and easy to industrialize, an environment-friendly oxidizing agent is adopted, environmental pollution is effectively avoided, the water treatment cost is reduced, the product cost is indirectly reduced, and MBTS obtained through the preparation method is high in melting point and yield, large in product particle and convenient to filter, dry, package and transport.

Description

technical field [0001] The invention relates to a method for producing rubber vulcanization accelerator MBTS by air oxidation, and belongs to the technical field of rubber vulcanization accelerator MBTS production. Background technique [0002] Dibenzothiazole disulfide (also known as accelerator MBTS, accelerator DM) is a chemical substance used as a general accelerator for natural rubber, synthetic rubber, and reclaimed rubber. It is mainly used in the manufacture of tires, inner tubes, tapes, and rubber shoes. It is an important pharmaceutical intermediate for the manufacture of cephalosporin anti-inflammatory drugs, and is widely used in industrial production and pharmaceutical industries. [0003] There are several ways to produce MBTS in industry. Such as sulfuric acid and sodium nitrite oxidation accelerator M. The specific process is: configure sulfuric acid into a 10% solution in the acid mixing tank, and input it into the high level tank for standby, and the oxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/05C25B3/09C25B3/23
CPCC25B3/05C25B3/09C25B3/23Y02W30/62
Inventor 王博张童
Owner SHANDONG UNIV OF SCI & TECH
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