Water-soluble chitosan phosphate, and preparation application and thereof

A chitosan phosphate, water-soluble technology, applied in the field of water-soluble chitosan phosphate and its preparation and application, to achieve the effect of high corrosion inhibition performance, low cost, and low price

Inactive Publication Date: 2013-05-22
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With the strengthening of environmental protection and safety awareness, some toxic corrosion inhibitors will be restricted or banned

Method used

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  • Water-soluble chitosan phosphate, and preparation application and thereof
  • Water-soluble chitosan phosphate, and preparation application and thereof
  • Water-soluble chitosan phosphate, and preparation application and thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The preparation method of chitosan phosphate:

[0018] Add chitosan to excess 1% acetic acid by volume to dissolve, add 20mL of phosphoric acid solution with 45% volume fraction dropwise, raise the temperature and add 20mL of formaldehyde solution with 45% volume fraction dropwise, and react under reflux for 4h when the temperature reaches 65°C After the reaction is completed, cool down, add 400-500 mL of ethanol solution with a volume fraction of 95%, filter with suction, wash with absolute ethanol, and dry in vacuum at 55° C. to obtain a white solid, which is water-soluble chitosan phosphate.

[0019] Wherein n=685 infrared spectrogram data are as follows:

[0020] 1159cm -1 and 877cm -1 It is the characteristic peak of chitosan sugar group, 1047cm -1 It is the characteristic peak of -C-O-C (glycosidic bond), 1638cm -1 Strong absorption peak for amino group; 2973cm -1 It is the methylene antisymmetric stretching vibration absorption band, 1350-1150cm -1 The pl...

Embodiment 2

[0036] Conditions: the experimental material is Q235a carbon steel, the water-soluble chitosan phosphate ester obtained above is dissolved in seawater, and the corrosion inhibitor is obtained by ultrasonic dispersion for 20 minutes, and the concentration of the water-soluble chitosan phosphate ester in the corrosion inhibitor is 200mg / L. Then Q235a carbon steel was immersed in the above corrosion inhibitor at a temperature of 20°C, and the experiment period was 240h.

[0037] The corrosion inhibition efficiency obtained through the experimental test is: 83.82% in the weight loss experiment, and 48.15% in the dynamic potential polarization, which shows that it is a corrosion inhibitor with low dosage and high efficiency.

Embodiment 3

[0039] Conditions: the experimental material is Q235a carbon steel, the water-soluble chitosan phosphate ester obtained above is dissolved in seawater, and the corrosion inhibitor is obtained by ultrasonic dispersion for 20 minutes, and the concentration of the water-soluble chitosan phosphate ester in the corrosion inhibitor is 300mg / L. Then Q235a carbon steel was immersed in the above corrosion inhibitor at a temperature of 20°C, and the experiment period was 240h.

[0040] Conditions: The experimental material is Q235a carbon steel. Dissolve a certain amount of chitosan phosphate in seawater, disperse it with ultrasonic waves for 20 minutes, and prepare a medium containing 300mg / L of corrosion inhibitor. The temperature is 20°C, and the experiment period is 240h.

[0041] The corrosion inhibition efficiency obtained through the experimental test is 88.71% in the weight loss experiment and 60.02% in the dynamic potential polarization, which shows that it is a corrosion inhi...

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Abstract

The invention relates to a seawater corrosion inhibitor for carbon steel, particularly a water-soluble chitosan phosphate, and preparation and application thereof. The structural formula of the water-soluble chitosan phosphate is disclosed in the specification, wherein n is approximately equal to 685. The water-soluble chitosan phosphate can be used as a corrosion inhibitor for carbon steel. The product provided by the invention can prevent general corrosion and partial corrosion of medium-carbon steel in the seawater contact process. The compound can not be used as a metal corrosion inhibitor yet. The corrosion inhibitor provided by the invention has the advantages of simple production process, low manufacturing cost, low consumption and low toxicity, can effectively inhibit corrosion attack of the seawater onto the carbon steel, and has wide application prospects.

Description

technical field [0001] The invention relates to a seawater corrosion inhibitor for carbon steel, in particular to a water-soluble chitosan phosphate and its preparation and application. Background technique [0002] Seawater corrosion has caused huge economic losses to human beings. At present, the methods to prevent its corrosion include surface coating, surface treatment, electrochemical protection, etc., and adding corrosion inhibitors is a method with simple process, low cost and strong applicability. It has great achievements in protecting resources and reducing material loss. It is widely used in various fields. With the strengthening of environmental protection and safety awareness, some toxic corrosion inhibitors will be restricted or banned. [0003] Chitosan is the product of deacetylation of chitin, and there are a large number of free amino groups. Chitosan has a certain corrosion inhibition effect, and it is environmentally friendly and cheap. It has high app...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/08C23F11/173
Inventor 李言涛吴茂涛
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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