Water-soluble antirust agent as well as preparation method and application thereof

A rust inhibitor and water-soluble technology, applied in the field of water-soluble N-fatty acylaminocaproic acid triethanolamine salt and its preparation, can solve the problems of rust prevention performance evaluation and the like, and achieve good rust prevention performance, easy availability of raw materials, and reaction mild conditions

Inactive Publication Date: 2020-04-21
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inspection method of its anti-rust performance is not a standard test method, and it is difficult to judge its anti-rust performance.

Method used

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  • Water-soluble antirust agent as well as preparation method and application thereof
  • Water-soluble antirust agent as well as preparation method and application thereof
  • Water-soluble antirust agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Take 1 mol of caprolactam, 2.5 mol of sodium hydroxide, and 30 mol of water, mix evenly, stir and reflux until the caprolactam is completely hydrolyzed. The temperature of the system was lowered to 0° C., and 0.9 mol of isononanoyl chloride was slowly added dropwise therein, and the temperature of the system was controlled at 0° C. during the whole dropping process. After the addition of isononanoyl chloride was completed, the temperature was raised to 90°C for 4 hours. Cool down to room temperature, add hydrochloric acid to acidify to pH 2. The upper oil layer of the reaction solution was separated, and washed with hot distilled water until the chloride ion concentration was lower than 200ppm to obtain N-isononanoylaminocaproic acid. React it with triethanolamine at a molar ratio of 1:2 for 4 hours, and cool to room temperature to obtain a water-soluble N-isononanoylaminocaproic acid triethanolamine salt rust inhibitor.

[0062] The above-mentioned N-isononanoylamino...

Embodiment 2

[0068] Take 1 mol of caprolactam, 1 mol of sodium hydroxide, and 10 mol of water, mix evenly, stir and reflux until the caprolactam is completely hydrolyzed. The temperature of the system was lowered to -5°C, and 0.6 mol of isooctanoyl chloride was slowly added dropwise thereto, and the temperature of the system was controlled at -5°C during the entire dropping process. After the addition of isooctanoyl chloride was completed, the temperature was raised to 60° C. for 2 h. Cool down to room temperature, add hydrochloric acid to acidify to pH 1. The upper oil layer of the reaction solution was separated, and washed with hot distilled water until the chloride ion concentration was lower than 200ppm to obtain N-isooctanoylaminocaproic acid. React it with triethanolamine at a molar ratio of 1:1 for 4 hours, and cool to room temperature to obtain a water-soluble N-isooctanoylaminocaproic acid triethanolamine salt rust inhibitor.

[0069] The above-mentioned N-isooctanoylaminocapro...

Embodiment 3

[0075] Take 1 mol of caprolactam, 4 mol of sodium hydroxide, and 40 mol of water, mix evenly, stir and reflux until the caprolactam is completely hydrolyzed. The temperature of the system was lowered to 5°C, and 1.2 mol of decanoyl chloride was slowly added dropwise therein, and the temperature of the system was controlled at 5°C during the whole dropping process. After the addition of decanoyl chloride was completed, the temperature was raised to 100°C for 6 hours. Cool down to room temperature, add hydrochloric acid to acidify to pH 3. The upper oil layer of the reaction solution was separated, and washed with hot distilled water until the chloride ion concentration was lower than 200ppm to obtain N-decanoylaminocaproic acid. React it with triethanolamine at a molar ratio of 1:3 for 4 hours, and cool to room temperature to obtain a water-soluble N-decanoylaminocaproic acid triethanolamine salt rust inhibitor.

[0076] The above-mentioned N-decanoylaminocaproic acid trietha...

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Abstract

The invention relates to a water-soluble antirust agent, and also relates to a preparation method of the water-soluble antirust agent. The method comprises the following steps: (1) adding caprolactaminto a strong alkali aqueous solution, and carrying out reflux hydrolysis to form an aminocaproate aqueous solution; (2) cooling the aminocaproate aqueous solution to -5 to 5 DEG C, slowly dropwise adding fatty acyl chloride into the aminocaproate aqueous solution, and keeping the temperature of the reaction system at -5 to 5 DEG C in the whole dropwise adding process; (3) after addition of the fatty acyl chloride is finished, slowly heating, and continuously reacting; (4) cooling the reaction system in the step (3) to room temperature, adding hydrochloric acid for acidification, standing forlayering, and taking an upper organic phase to obtain an intermediate of the water-soluble antirust agent; and (5) washing the intermediate with hot distilled water until the chloride ion concentration is lower than 200 ppm, and reacting with triethanolamine to obtain the water-soluble antirust agent. The invention also relates to application of the water-soluble antirust agent in antirust additives of water-based metal machining fluids and water-based hydraulic fluids.

Description

technical field [0001] The invention relates to a water-soluble antirust agent and its preparation method and application, in particular to a water-soluble N-fatty acylaminocaproic acid triethanolamine salt and its preparation method and application. The invention belongs to the technical field of novel compound preparation and metal processing fluid additive preparation technology. Background technique [0002] Water-based metalworking fluids contain a large amount of water, which can easily cause corrosion of processing equipment and workpieces during use. Metalworking fluids are generally used in open or semi-closed environments, and workpieces are prone to frequent contact with impurities such as air and chips. It is easy to cause rust. Therefore, the antirust performance of water-based metalworking fluids is an important performance related to the success or failure of workpiece processing, and antirust agents have also become an essential and important component of wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C233/47C07C231/02C07C231/12C07C215/12C07C213/08C07C229/08C07C227/22C10M133/16C10M133/08C10N30/12C10N40/20
CPCC07C233/47C07C231/02C07C231/12C07C215/12C07C213/08C07C227/22C10M133/16C10M133/08C10M2215/08C10M2215/042
Inventor 李团乐徐宁陈馥婧段况华周旭光
Owner PETROCHINA CO LTD
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