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Method for manufacturing water-based metal antirust agents

A metal antirust agent, water-based technology, applied in the field of metal antirust, can solve problems such as human body and environmental hazards, and achieve the effect of high product purity, high yield, and less impurities

Inactive Publication Date: 2014-12-17
徐立庶
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nitrite is a carcinogen with high toxicity and great harm to human body and environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of preparation method of water-based metal antirust agent of the present invention comprises the following steps:

[0019] (1) Put caprolactam and sodium hydroxide into water at a molar ratio of 1:1, so that the water accounts for 80% of the total mass; raise the temperature to 80°C and keep it for 6 hours;

[0020] (2), cool down the solution obtained in step (1) to 10°C, add cyanuric chloride to 1 / 4 of the molar weight of caprolactam according to step (1); after 2 hours of heat preservation, add sodium hydroxide to adjust the pH value to 9 ;

[0021] (3), heating up to 80°C and maintaining for 5 hours, adjusting the pH value to 9 with sodium hydroxide;

[0022] (4), cool down to 40°C, add hydrochloric acid after filtration to make the pH value 2; keep warm at 40°C for 3 hours after circulating and stirring;

[0023] (5), pressure filtration obtains solid;

[0024] (6), the solid is washed with deionized water and then press-filtered to obtain the product.

Embodiment 2

[0026] A kind of preparation method of water-based metal antirust agent of the present invention comprises the following steps:

[0027] (1) Put caprolactam and sodium hydroxide into water at a molar ratio of 1:0.9, so that the water accounts for 70% of the total mass; raise the temperature to 60°C and keep it for 10 hours;

[0028] (2), cool down the solution obtained in step (1) to 5°C, add cyanuric chloride to 1 / 5 of the molar weight of caprolactam according to step (1); after 3 hours of heat preservation, add sodium hydroxide to adjust the pH value to 7.5 ;

[0029] (3), heating up to 70°C and maintaining for 5 hours, adjusting the pH value to 7.5 with sodium hydroxide;

[0030] (4), cool down to 30°C, add hydrochloric acid after filtration to make the pH value 1; keep warm at 30°C for 5 hours after circulating and stirring;

[0031] (5), pressure filtration obtains solid;

[0032] (6), the solid is washed with deionized water and then press-filtered to obtain the produ...

Embodiment 3

[0034] A kind of preparation method of water-based metal antirust agent of the present invention comprises the following steps:

[0035] (1) Put caprolactam and sodium hydroxide into water at a molar ratio of 1:1.5, so that the water accounts for 90% of the total mass; raise the temperature to 60°C and keep it for 3 hours;

[0036] (2), cool the solution obtained in step (1) to 20°C, add cyanuric chloride to 1 / 3 of the molar weight of caprolactam according to step (1); after 3 hours of heat preservation, add sodium hydroxide to adjust the pH value to 10 ;

[0037] (3), be heated up to 100 ℃ and keep 5 hours, adjust pH value to 10 with sodium hydroxide;

[0038] (4), cool down to 30°C, add hydrochloric acid after filtration to make the pH value 3; keep warm at 30°C for 5 hours after circulating and stirring;

[0039] (5), pressure filtration obtains solid;

[0040] (6), the solid is washed with deionized water and then press-filtered to obtain the product.

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Abstract

The invention relates to the technical field of metal rust protection, in particular to a method for manufacturing water-based metal antirust agents. The method comprises the following steps that caprolactam and sodium hydroxide are put into water according to the molar ratio of 1:0.8 to 1.5, temperature rises to 60 DEG C to 100 DEG C, and the temperature is kept for three hours to ten hours; (2) the temperature is cooled to 0 DEG C to 20 DEG C, and 1 / 5 to 1 / 3 of the molar weight of caprolactam is put according to the step (1), cyanuric chloride is added, heat preservation is carried out for one to three hours, sodium hydroxide is added, and the PH value is adjusted to 7.5 to 12; (3) temperature rises to 70 DEG C to 100 DEG C, the temperature is kept for five hours, and the sodium hydroxide is used for adjusting the PH value to 7.5 to 12; (4) the temperature is cooled to 30 DEG C to 50 DEG C, solutions are filtered, then, hydrochloric acid is added to enable the PH value to one to three, circulating stirring is carried out, and the heat preservation is carried out for one to five hours at the temperature of 30 DEG C to 60 DEG C. The method for manufacturing the water-based metal antirust agents has the advantages of being environmentally friendly, high in yield, high in product purity, excellent in product performance and low in cost.

Description

technical field [0001] The invention relates to the technical field of metal antirust, in particular to a preparation method of a water-based metal antirust agent. Background technique [0002] Metals are widely used in various industries such as machinery, automobiles, home appliances, and construction. Metal rust affects equipment performance and even requires scrapping. In order to improve metal performance and reduce rust waste, antirust treatment is required on the surface. [0003] Water-based rust inhibitor has the advantages of safety, convenient operation and low cost. Most of the water-based antirust agents currently used are formulated with nitrite as the main component, and nitrite water-based antirust agents are widely used. However, nitrite is a carcinogen with high toxicity and great harm to human body and environment. [0004] The prior art nitrite-free organic water-based antirust agent comes from a manufacturer——Ciba Specialty Chemicals, and its L190 wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/00
Inventor 徐立庶
Owner 徐立庶
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