Preparation method of high-yield and low-cost peptizer DBD

A peptizer and low-cost technology, which is applied in the field of preparation of high-yield and low-cost peptizer DBD, can solve the problem of low product yield and quality, complex production process synthesis path, production process synthetic raw materials and high engineering process costs. problem, to achieve the effect of stable product quality, shortening crystallization time, and simple and convenient path.

Active Publication Date: 2015-11-18
SHANDONG YANGGU HUATAI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 1. The cost of synthetic raw materials and engineering process of this production process is relatively high;
[001

Method used

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  • Preparation method of high-yield and low-cost peptizer DBD

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A kind of preparation method of peptizer DBD with high yield and low cost comprises steps as follows:

[0047] (1) Get 100g of 2-mercaptobenzothiazole and mix it with 250g of 30wt% hydrogen peroxide, add 400g of water to dilute, heat up at 20°C to oxidize mercapto, react for 2 hours, then add 50g of concentrated phosphoric acid of 85wt% to acidify for 2.5 hours, remove Remove the oxidized mercapto groups, separate the liquid after standing for stratification, remove the upper liquid, and then use soda ash to adjust the pH of the lower liquid to 7 to obtain liquid benzothiazole,

[0048](2) 50 g of liquid benzothiazole is mixed with 100 g of a saturated solution of potassium hydroxide with a concentration of 40 wt %, heated up to 125° C. for 5 h to react with alkali decarburization, and after the reaction is finished, add water to cool down to obtain 2-mercaptoaniline. The amount of water added is the same as that of the liquid The mass ratio of benzothiazole is 5:2,

...

Embodiment 2

[0053] A kind of preparation method of peptizer DBD with high yield and low cost comprises steps as follows:

[0054] (1) Get 150g of 2-mercaptobenzothiazole and mix it with 375g of 40wt% hydrogen peroxide, add 600g of water to dilute, heat up at 20°C to oxidize mercapto, react for 2 hours, then add 70g of concentrated phosphoric acid of 85wt% to acidify for 2.5 hours, remove Remove the oxidized mercapto groups, separate the liquid after standing for stratification, remove the upper liquid, and then use soda ash to adjust the pH of the lower liquid to 7 to obtain liquid benzothiazole,

[0055] (2) 100g of liquid benzothiazole is mixed with 100g of saturated potassium hydroxide solution with a concentration of 40wt%, and the temperature is raised to 125° C. for 5 hours to react with alkali decarburization. After the reaction, water is added to cool down to obtain 2-mercaptoaniline. The amount of water added is the same as that of the liquid The mass ratio of benzothiazole is 5:...

Embodiment 3

[0060] A kind of preparation method of peptizer DBD with high yield and low cost comprises steps as follows:

[0061] (1) Get 55g of 2-mercaptobenzothiazole and mix it with 120g of 40wt% hydrogen peroxide, add 200g of water to dilute, heat up at 20°C to oxidize mercapto, react for 2 hours, then add 25g of concentrated phosphoric acid of 86wt% to acidify for 2.5 hours, remove Remove the oxidized mercapto groups, separate the liquid after standing for stratification, remove the upper liquid, and then use soda ash to adjust the pH of the lower liquid to 7 to obtain liquid benzothiazole,

[0062] (2) 40 g of liquid benzothiazole is mixed with 110 g of a saturated solution of potassium hydroxide with a concentration of 40 wt%, and the temperature is raised to 125° C. for 5 hours to react with alkali decarburization. After the reaction, water is added to cool down to obtain 2-mercaptoaniline. The amount of water added is the same as that of the liquid The mass ratio of benzothiazole...

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Abstract

The invention relates to a preparation method of a high-yield and low-cost peptizer DBD. The method comprises steps as follows: (1) desulfurizing 2-mercaptobenzothiazole to obtain benzothiazole; (2) performing alkaline hydrolysis and decarbonization on the benzothiazole to obtain 2-aminothiophnol; (3) oxidizing the 2-aminothiophnol to produce diphenyl amino disulfide; (4) performing acylation on the diphenyl amino disulfide and benzoyl chloride to produce the DBD. According to the method, the 2-mercaptobenzothiazole is used as a raw material, so that the production cost is greatly reduced; the path for synthesizing the 2-aminothiophnol is simple and convenient, workshop operation is easy, and the yield is high.

Description

technical field [0001] The invention relates to a preparation method of a high-yield and low-cost peptizer DBD, which belongs to the technical field of rubber smelting. Background technique [0002] Mastication is a process of rubber processing, which uses mechanical or chemical methods to reduce the relative molecular weight and viscosity of raw rubber to improve its plasticity and obtain proper fluidity to meet the needs of further processing of raw rubber. Peptizer DBD is a new type of environmentally friendly, non-toxic, high-efficiency peptizer. The mechanism of its use in plasticizing raw rubber is that the peptizer DBD decomposes into sulfur-containing free radicals under the action of heat. On the one hand, it acts as a free radical On the other hand, it captures the hydrogen atoms in the macromolecular chain of raw rubber, promotes the breakage of the rubber molecular chain, achieves the purpose of reducing the molecular weight of raw rubber and improving the peptiz...

Claims

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Application Information

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IPC IPC(8): C07C323/42C07C319/22
Inventor 马松吕寻伟潘林琳杜孟成孙庆刚
Owner SHANDONG YANGGU HUATAI CHEM
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