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Corrosion inhibitor in use for lubricating oil in esters

A technology of lubricating oil and corrosion inhibitor, which is applied in the field of ester lubricating oil, can solve the problems of immiscibility, small acid value of corrosion inhibitor, low polarity, etc., and achieve good reproducibility, excellent thermal stability, and good dissolution sexual effect

Inactive Publication Date: 2007-12-26
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] The corrosion inhibitor has a small acid value but low polarity, and is only suitable for non-polar mineral oils, and is physically immiscible with highly polar ester oils

Method used

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  • Corrosion inhibitor in use for lubricating oil in esters
  • Corrosion inhibitor in use for lubricating oil in esters
  • Corrosion inhibitor in use for lubricating oil in esters

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Embodiment 1

[0021] 1.1 The present invention is prepared according to the following reaction formula:

[0022]

[0023] Mechanical stirring is housed, thermometer, in the 10L three-necked round-bottomed flask of reflux condenser, drop into the benzotriazole of 2383g (20mol), the n-butyl acrylate of 3332g (26mol), 80g free radical inhibitor hydroquinone, 4000ml of toluene, reflux at 130°C for 10h, replace the distillation device, and recover the toluene and unreacted materials by atmospheric distillation. Raise the temperature to collect fractions at 178-180° C. / 3-5 mmHg to obtain about 4742 g of crude product (yield 96%). Dissolve the crude product in 9000ml of toluene, wash with 4% 4160g aqueous sodium hydroxide solution to remove the polymerization inhibitor, separate the water phase, wash the organic phase twice with 4% aqueous sodium chloride solution, wash once with distilled water, separate The organic phase was concentrated and recovered toluene. Then add 200g of basic alumina...

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Abstract

This invention discloses a corrosion inhibitor for grease lubricant. The structural formula of the corrosion inhibitor (benzotriazole derivative) is shown in this invention. The corrosion inhibitor is prepared by the reaction between benzotriazole and ester of mono unsaturated acid. The corrosion inhibitor can solve the problem of copper corrosion caused by free acids and corrosive medium due to oxidation of grease lubricant in the using environment.

Description

technical field [0001] The invention relates to a corrosion inhibitor for ester lubricating oil, which belongs to benzotriazole derivatives and is mainly used for ester lubricating oil. Background technique [0002] HFC-134a (1,1,1,2-tetrafluoroethane) is currently recognized as the best substitute for CFC-12 (dichlorodifluoromethane). However, due to its high polarity, it is physically incompatible with traditional mineral oil-based refrigeration lubricants, and the two cannot form a refrigeration system to complete the refrigeration work. Therefore be badly in need of developing the synthetic lubricating oil of the bigger ester structure of molecular polarity that matches with it, just can guarantee the smooth progress of CFC-12 substitution work. [0003] In order to formulate ester lubricating oils with good performance, in addition to ester base oils, various functional additives must be introduced, the most important of which is the selection of corrosion inhibitors. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M133/44C10N30/10
Inventor 甘孝贤卢先明邱少君张志刚邢颖
Owner XIAN MODERN CHEM RES INST
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