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Aqueous metal anti-rust agent

The technology of a water-based rust inhibitor and cyclohexylamine citric acid is applied in the field of metal rust inhibitors, and can solve the problems of the rust inhibitor's rust-proof performance, the convenience of preparation and the production cost that needs to be improved, the anti-corrosion performance is not ideal, and the like, and achieves good anti-rust performance. Rust effect, preventing corrosive medium from contacting metal, effect of less impurity ions

Inactive Publication Date: 2012-07-18
广州化学试剂厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these inorganic acid salts using cyclohexylamine are still unsatisfactory in corrosion resistance
[0007] However, the above-mentioned antirust agents still need to be improved in terms of antirust performance, preparation convenience, production cost, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0037] Weigh 210 grams of citric acid monohydrate in a 1000 mL beaker, add 400 mL of pure water, stir to dissolve, and filter for clarification. Add 317 grams of cyclohexylamine to another 1000mL beaker, slowly add the filtered and clear citric acid solution under stirring (50r / min), and complete the reaction at 80°C. At this time, the solution is transparent, and the pH of the solution is 8.5. Heating and concentrating until a crystalline film appears, pour the concentrated crystal into a clean plate and let it cool to form a block, then make into small blocks and dry at 85° C. for 4 hours to obtain 451.4 g of the product with a yield of 98.4%. Detection, the content is 99.3% (with (C 6 H 13 N) 3 ·C 6 H 8 O 7 The content of C1, F and Br is all <10ppm.

preparation example 2

[0039] Weigh 210 grams of citric acid monohydrate in a 1000 mL beaker, add 400 mL of pure water, stir to dissolve, and filter for clarification. Add 307 grams of cyclohexylamine to another 1000mL beaker, slowly add the filtered and clear citric acid solution under stirring (50r / min), and complete the reaction at 80°C. At this time, the solution is transparent, and the pH of the solution is 7.5. Heating and concentrating until a crystalline film appeared, pouring the concentrated crystals into a clean dish and cooling to form blocks, then making small blocks and drying at 80°C for 4 hours to obtain 445.8 g of the product with a yield of 97.2%. Detection, the content is 99.1% (with (C 6 H 13 N) 3 ·C 6 H 8 O 7 ), the content of Cl, F and Br are all <10ppm.

preparation example 3

[0041] Weigh 210 grams of citric acid monohydrate in a 1000 mL beaker, add 400 mL of pure water, stir to dissolve, and filter for clarification. In another 1000mL beaker, add 327 grams of cyclohexylamine, slowly add the filtered clarified citric acid solution under stirring (50r / min), and complete the reaction at 90°C. At this time, the solution is transparent, and the pH of the solution is 9. Heating and concentrating until a crystalline film appeared, pouring the concentrated crystals into a clean dish and cooling to form blocks, then making small blocks and drying at 95° C. for 3 hours to obtain 453.6 g of the product with a yield of 98.9%. Detection, the content is 99.3% (with (C 6 H 13 N) 3 ·C 6 H 8 O 7 ), the content of Cl, F and Br are all <10ppm.

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Abstract

The invention discloses an aqueous metal anti-rust agent containing cyclohexylamine citrate. The aqueous metal anti-rust agent has good anti-rust effects on iron, steel, iron alloys, aluminum, copper and the like, and thus can be utilized for rust protection of metal equipment and parts, wherein the metal equipment and parts are made of iron, steel, iron alloys, aluminum, copper and the like.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to an aqueous metal rust inhibitor containing cyclohexylamine citrate. Background technique [0002] At present, water-based rust inhibitors are widely used in metal rust prevention. Water-based rust inhibitor has the advantages of safety, improvement and simplification of production process, and reduction of production cost. However, most of the water-based rust inhibitors currently used are formulated with nitrite as the main component. Nitrite is a carcinogenic substance with great toxicity and great harm to humans, animals and the environment. Therefore, it is desired to develop a nitrite-free aqueous rust inhibitor. [0003] For example, Chinese Patent Publication CN101532131 discloses a long-acting water-based metal rust inhibitor, which contains phytic acid, ethanolamine, borax and amide. The rust inhibitor is said to be non-toxic, harmless and environmentally...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/14
Inventor 喻小琦傅琼莲李帅
Owner 广州化学试剂厂
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