Chitosan modified derivative corrosion inhibitor and preparation method thereof

A chitosan modification and derivative technology, which is applied in the field of metal corrosion and protection, can solve the problems of high corrosion inhibition efficiency of molybdenum-based corrosion inhibitors, insufficient concentration of anodic corrosion inhibitors, and aggravated eutrophication. Effects of water solubility and biocompatibility, corrosion inhibition, and wide range of raw material sources

Inactive Publication Date: 2016-09-28
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sodium nitrite can generate insoluble dense oxides on the surface of steel, causing the metal surface to change from an active state to a passive state, and has a good anti-rust effect, but it is carcinogenic and its use is limited
The corrosion inhibition effect of chromium corrosion inhibitor is very good at a certain dose, but its concentration as an anodic corrosion inhibitor is insufficient or too high, it will cause serious corrosion to metal, and its toxicity is high, so its use has been restricted
Phosphorus-based corrosion inhibitors mainly include inorganic phosphates such as orthophosphorus and polyphosphorus, and organic polyphosphonic acid, phosphorus carboxylic acid, polyphosphate, etc., which have a corrosion inhibitory effect on steel, but due to the aggravation of eutrophication in water bodies around the world, phosphorus become a major emission control object, which restricts its use
Molybdenum-based corrosion inhibitors have high corrosion inhibition efficiency, low toxicity, and good stability, and are suitable for use under high pH, ​​high hardness water and high temperature conditions; however, the single use of molybdenum-based corrosion inhibitors has too much dosage and high cost shortcoming

Method used

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  • Chitosan modified derivative corrosion inhibitor and preparation method thereof
  • Chitosan modified derivative corrosion inhibitor and preparation method thereof
  • Chitosan modified derivative corrosion inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation method of chitosan derivative corrosion inhibitor specifically includes the following steps:

[0038] Step 1: Preparation of hydroxypropyl chitosan.

[0039]Mix chitosan, NaOH and isopropanol, stir at room temperature for 1-2 h; then add tetramethylammonium hydroxide solution and propylene oxide, stir at room temperature for 30-40 min, and then heat up to 40-70 °C , stirring at this temperature under reflux for 8-9h, neutralizing with aqueous hydrochloric acid solution after the reaction to neutrality, then precipitating the product with acetone, suction filtration to obtain the crude product; dissolving the obtained crude product in deionized water, then adding a large amount of ethanol to precipitate the product, filter, repeat the above steps 3-5 times, and put it in an oven for drying at 50°C.

[0040] Step 2: Preparation of carboxymethylated hydroxypropyl chitosan.

[0041] Dissolve the crude product obtained above in water, stir at room temperatu...

Embodiment 2

[0043] The difference between this embodiment and Embodiment 1 is only in step 2, which is specifically:

[0044] Step 2: Preparation of carboxymethylated hydroxypropyl chitosan.

[0045] The above-mentioned hydroxypropyl chitosan is weighed and dissolved in distilled water, stirred at room temperature for 0.5-1 h, then added with aqueous sodium hydroxide solution, and stirred for 6-7 h for alkalization. The aqueous solution of chloroacetic acid is added dropwise, the dropwise addition is completed, the temperature is raised to 40-70° C., and the reaction is carried out for a period of time to obtain a uniform and transparent liquid. Add acetic acid to adjust to neutrality, use acetone for precipitation, and suction filtration to obtain a crude product. The obtained crude product is dissolved in deionized water, and then a large amount of ethanol is added to it to precipitate the product, and suction filtration is carried out with a suction filtration bottle. Repeat the above...

Embodiment 3

[0049] The difference between this embodiment and Embodiment 2 is only in step 2, which is specifically:

[0050] Step 2: Preparation of carboxymethylated hydroxypropyl chitosan.

[0051] Weigh the above-mentioned hydroxypropyl chitosan and dissolve it in distilled water, stir at room temperature for 0.5-1 h, add chloroacetic acid aqueous solution dropwise at a speed of 30-40 drops / min, after the dropwise addition is completed, heat up to 40-70 ° C, and react for a period of time, A homogeneous transparent liquid was obtained. Add acetic acid to adjust to neutrality, use acetone for precipitation, and suction filtration to obtain a crude product. The obtained crude product is dissolved in deionized water, and then a large amount of ethanol is added to it to precipitate the product, and suction filtration is carried out with a suction filtration bottle. Repeat the above steps 3-5 times and dry at 50-60°C to obtain the final product. The ratio of hydroxypropyl chitosan (g), di...

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Abstract

The invention belongs to the field of metal corrosion and protection and particularly relates to a chitosan modified derivative corrosion inhibitor and a preparation method thereof. Application of the modified derivative to other fields such as the biological field and the medicine field is not subjected to related verification or illustration. The chitosan modified derivative corrosion inhibitor is carboxymethylation hydroxypropyl chitosan, that is, chitosan is modified through carboxymethylation and hydroxypropylation, a carboxymethyl group and a hydroxypropyl group are introduced, and the chitosan derivative with multiple substituent groups is obtained. The environment-friendly chitosan modified derivative corrosion inhibitor and the preparation method thereof are applicable to a corrosive medium, the production process is simple, the raw material source is wide, and the chitosan modified derivative has good water solubility and biocompatibility.

Description

technical field [0001] The invention belongs to the field of metal corrosion and protection, in particular to a chitosan modified derivative corrosion inhibitor and a preparation method thereof. Background technique [0002] Corrosion is an important destructive factor in modern industry and life, and the annual corrosion loss in my country accounts for about 6% of the gross national product. At present, there are many anti-corrosion methods such as surface coating, surface treatment, electrochemical protection, etc., and the addition of corrosion inhibitors is a method with simple process, low cost and strong applicability. Widely used in various fields. With the advent of the ocean century, more and more attention has been paid to the development and utilization of seawater resources, but seawater will cause huge economic losses due to its strong corrosiveness. Playing an increasingly important role, corrosion inhibitors can be divided into inorganic and organic types ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08C23F11/173
CPCC08B37/003C23F11/173
Inventor 冯盼盼万凯李言涛
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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