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2-amino-5-mercapto-1,3,4-thiadiazole dimer and its preparation method and application

A technology of thiadiazole dimer and thiadiazole derivatives, applied in lubricating compositions, petroleum industry, additives, etc., can solve problems such as unpublished reports

Active Publication Date: 2015-12-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The general chemical formula and preparation method of the compound of the present invention and the application in lubricating grease have not yet been publicly reported in domestic and foreign patents and literature

Method used

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  • 2-amino-5-mercapto-1,3,4-thiadiazole dimer and its preparation method and application
  • 2-amino-5-mercapto-1,3,4-thiadiazole dimer and its preparation method and application
  • 2-amino-5-mercapto-1,3,4-thiadiazole dimer and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 67g of 2-amino-5-mercapto-1,3,4-thiadiazole, 60ml of ethanol, and 40ml of water into a 200ml four-necked flask with an electric stirrer and a condenser, and 2 1. Under stirring, slowly add 32g of 30.0% hydrogen peroxide dropwise into the reaction vessel. After the dropwise addition of hydrogen peroxide is completed, the system is heated to 60-70°C and reacted for 2.5 hours. After the reaction is completed, filter and dry to obtain 63g of the product.

Embodiment 2

[0024] Add 133g of 2-amino-5-mercapto-1,3,4-thiadiazole, 100ml of ethanol, and 50ml of water into a 500ml four-necked flask with an electric stirrer and a condenser, and 2 1. Under stirring, slowly drop 63g of 30.0% hydrogen peroxide into the reaction vessel. After the hydrogen peroxide is added dropwise, the temperature of the system is raised to 65-75°C, and the reaction is carried out for 2.5 hours. After the reaction is completed, filter and dry to obtain 126g of the product.

Embodiment 3

[0026] Add 266g of 2-amino-5-mercapto-1,3,4-thiadiazole, 300ml of ethanol, and 300ml of water into a 1000ml four-necked flask with an electric stirrer and a condenser, and 2 1. Under stirring, slowly add 125g of 30.0% hydrogen peroxide dropwise into the reaction vessel. After the dropwise addition of hydrogen peroxide is completed, the system is heated to 70-80°C and reacted for 3 hours. After the reaction is completed, filter and dry to obtain 251g of the product.

[0027] The C, H, N, S element analysis results of all target compounds are shown in Table 1. As can be seen from the element analysis results in Table 1, the measured values ​​of the three batches of compound C, H, N, and S elements are consistent with those calculated by the molecular formula. The theoretical values ​​are basically consistent within the error range, so it can be determined that the prepared compound is the target compound.

[0028] Table 1 Elemental analysis results of three batches of compounds ...

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Abstract

The invention relates to a thiadiazole derivative, which is characterized in that the thiadiazole derivative is a 2-amino-5-mercapto-1,3,4-thiadiazole dimer, and has the following structural formula. The preparation method comprises that: 2-amino-5-mercapto-1,3,4-thiadiazole and hydrogen peroxide are subjected to an oxidation reaction for 2-6 h at a temperature of room temperature to 100 DEG C in the presence of a reaction medium selected from water, ethanol, acetone, petroleum ether or two compounds thereof. The 2-amino-5-mercapto-1,3,4-thiadiazole dimer can be adopted as an extreme pressure anti-wear additive applied in lubricating grease, and has characteristics of excellent extreme pressure, good wear resistance, and corrosion resistance.

Description

Technical field: [0001] The invention relates to 2-amino-5-mercapto-1,3,4-thiadiazole dimer, its preparation method and its application in lubricating grease. The dimer can be used as extreme pressure and anti-wear additive. The invention belongs to the field of lubricating grease additives. technical background: [0002] In order to improve the lubricating performance of the grease and prolong the service life of the equipment, a certain amount of extreme pressure anti-wear agent needs to be added to it to form a protective film (adsorption or reaction film) on the friction surface, thereby preventing direct contact between metals and reducing the friction surface The frictional resistance between them prevents wear and abrasion of the material. [0003] Elements such as S, P, and Cl are excellent active elements to improve the extreme pressure, anti-wear, and anti-friction properties of lubricating greases, but there are defects that improper application will cause excess...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M135/36C07D285/135
Inventor 孙令国李久盛周旭光胡斌
Owner PETROCHINA CO LTD