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Preparation method of antioxidation antifriction lubricating oil additive

A technology of additives and acid catalysts, applied in the direction of additives, lubricating compositions, petroleum industry, etc., can solve the problems of limited dosage, oil oxidation stability and oil anti-wear performance, etc., achieve good compatibility performance, improve oxidation resistance Stability and anti-wear properties, easy-to-dissolve effect

Inactive Publication Date: 2004-10-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to environmental protection requirements, oil products tend to have low ash content and low phosphating, so the dosage of this agent is limited. Affected by this, the oxidation stability and anti-wear performance of oil products cannot be guaranteed.

Method used

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  • Preparation method of antioxidation antifriction lubricating oil additive
  • Preparation method of antioxidation antifriction lubricating oil additive
  • Preparation method of antioxidation antifriction lubricating oil additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Preparation of 2-mercapto-5-tert-dodecyldithio 1, 3, 4 thiadiazole

[0018] According to the conventional method, 2,5 dimercapto 1,3,4 thiadiazole (DMTD) was prepared. Add 12 grams of sodium hydroxide, 20 grams of water and 15 grams of 50% hydrazine hydrate into a 100 ml three-necked flask, stir to dissolve the sodium hydroxide, add 28.5 grams of carbon disulfide, heat to 46 ° C, maintain the temperature for 1.5 hours, and then heat up to 80°C and reacted for 2 hours to obtain 64.5 g of a yellow-green solution, which was transferred to a 500 ml three-neck flask and acidified by adding 48 ml of hydrochloric acid to produce a white solid, namely DMTD.

[0019] Add 30 grams of tertiary dodecyl mercaptan and 100 milliliters of ethanol to DMTD, add 20 grams of hydrogen peroxide dropwise at 40°C, after 1 hour of dropping, the temperature rises to the reflux temperature, react for 2 hours, add solvent gasoline to extract Lift, transfer to 250 milliliters of separat...

Embodiment 2

[0020] Example 2: Preparation of 2-mercapto-5-n-octyldithio-1, 3, 4 thiadiazole

[0021] Referring to the method of Example 1, the tert-dodecylmercaptan in Example 1 is replaced with n-octylmercaptan to prepare 2-mercapto-5-n-octyldithio-1,3,4thiadiazole, and obtain 41 g of a viscous liquid product, 2-mercapto-5-n-octyldithio-1,3,4thiadiazole, has a sulfur content of 42.8% and a theoretical sulfur content of 43.2%.

Embodiment 3

[0022] Example 3: Preparation of 2-(3,5-di-tert-butyl-4-hydroxybenzyl)thio-5-tert-dodecyldithio 1,3,4 thiadiazole

[0023] Weigh 24.7 grams (0.12mol) of 2,6-di-tert-butylphenol, 4.2 grams (0.14mol) of paraformaldehyde, 42.2 grams (0.12mol) of the product of Example 1 and 0.3 grams of p-toluenesulfonic acid, respectively add 250ml three ports In the reaction bottle, the reaction bottle is equipped with a stirring and a condenser, stirring and heating to 110 ° C, and reacting for 6 hours. After the reaction, add 10 ml of 10% sodium bicarbonate aqueous solution to neutralize, then add 60 ml of solvent gasoline and 50 ml of water to extract the reaction Product, then transfer the extraction reaction product to a 500ml separatory funnel, wash with 50ml water each time, static layering, separate the water layer, repeat the second washing until the water layer is neutral. Washed solution is transferred in the 250ml distillation bottle, carries out normal, vacuum distillation, removes...

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Abstract

An antioxidizing and antiwear additive for lubricating oil is prepared from cryptophenol and 2-mercapto-5-alkylthio 1,3,4 thiadiazole through condensation reaction at 40-150 deg.C under existance of formaldehyde and acid catalyst.

Description

technical field [0001] The invention relates to a preparation method of a lubricating oil additive containing a sulfur shielding phenol structure. technical background [0002] As a lubricating oil, it should be able to meet the requirements of use. Usually, mechanical equipment needs to be lubricated to reduce friction during operation. During use, the lubricating oil is oxidized and deteriorated by factors such as ambient temperature, oxygen in the air, and metal catalysis, and produces low-molecular-weight small molecules such as alcohols, esters, ketones, and acids, which are further formed by polycondensation reactions. Molecular weight polymers form deposits, which lead to increased oil viscosity, poor lubricating performance, increased wear, and even severe corrosion of mechanical equipment, greatly reducing the function of the lubricating oil and shortening the service life of the oil. Therefore, the oxidation stability of oil is a particularly important index of oi...

Claims

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Application Information

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IPC IPC(8): C10M135/36
Inventor 李新华杨永璧
Owner CHINA PETROLEUM & CHEM CORP
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