Preparation of pH-controlled-release long-acting intelligent corrosion inhibitor

A technology of controlled release and corrosion inhibitors, applied in the field of preparation of long-acting intelligent corrosion inhibitors, to achieve high corrosion inhibition efficiency, good application prospects, and long service life

Inactive Publication Date: 2013-04-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional method of using corrosion inhibitors is to use one-off or continuous multiple injections, which makes the concentration of corrosion inhibitors too high at the initial stage of application, even higher than the maximum effective concentration. This is not only a waste of resources, but also sometimes Will reduce the slow release efficiency and even accelerate corrosion
In the later stage of application, the concentration of corrosion inhibitor is too low, even lower than the minimum effective concentration, which reduces the efficiency of corrosion inhibition and shortens the service life of corrosion inhibitor

Method used

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  • Preparation of pH-controlled-release long-acting intelligent corrosion inhibitor
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  • Preparation of pH-controlled-release long-acting intelligent corrosion inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) Preparation of pH-sensitive hydrogels

[0035] a) Add 2.0g of starch into a three-necked flask with a condenser, a stirrer and a thermometer, add 35mL of distilled water, blow in nitrogen, stir at 300 rpm, and gradually raise the temperature to 80°C. Dissolve 0.1 g of ammonium persulfate initiator in 5 mL of deionized water, add it into the above-mentioned reactant aqueous solution, and continue to pass nitrogen gas, and the reaction is stable for 10 min. Add 1.5g of acrylic acid and 1.5g of hydroxyethyl methacrylate to the above reactant aqueous solution; add 0.05g of methylenebisacrylamide cross-linking agent to 5mL of deionized water into the above reactant aqueous solution, controlled at React at the above stirring speed and temperature for 60 min.

[0036] b) After the reaction, cool to room temperature and adjust the pH to 8 with 1M NaOH solution. Add 0.05 g of sodium bicarbonate foaming agent, and stir at a speed of 500 rpm until a uniform foam form is ...

Embodiment 2

[0042] 1) Preparation of pH-sensitive hydrogels

[0043]a) Add 1.0g of starch into a three-necked flask equipped with a condenser, a stirrer and a thermometer, add 10mL of distilled water, blow in nitrogen, stir at a speed of 300 rpm, and gradually raise the temperature to 70°C. Dissolve 0.03g of ammonium persulfate initiator in 3mL of deionized water, add it into the above-mentioned reactant aqueous solution, continue to pass nitrogen, and the reaction is stable for 10min. Add 1g of acrylic acid and 1g of hydroxyethyl methacrylate to the above reactant aqueous solution; add 0.03g of methylenebisacrylamide crosslinking agent to 3mL of deionized water into the above reactant aqueous solution, and control the above stirring React at speed and temperature for 100 min.

[0044] b) After the reaction, cool to room temperature and adjust the pH to 8 with 1M NaOH solution. Add 0.05 g of sodium bicarbonate foaming agent, and stir at a speed of 500 rpm until a uniform foam form is pr...

Embodiment 3

[0049] 1) Preparation of pH-sensitive hydrogels

[0050] a) Add 2.0g of starch into a three-necked flask equipped with a condenser, a stirrer and a thermometer, add 20mL of distilled water, blow in nitrogen, stir at 300 rpm, and gradually raise the temperature to 100°C. Dissolve 0.3g of ammonium persulfate initiator in 5mL of deionized water, add it into the above-mentioned reactant aqueous solution, continue to pass nitrogen, and the reaction is stable for 10min. Add 1.5g of acrylic acid and 1.5g of hydroxyethyl methacrylate to the above reactant aqueous solution; add 0.3g of methylenebisacrylamide cross-linking agent to 5mL of deionized water into the above reactant aqueous solution, and control at React at the above stirring speed and temperature for 150 min.

[0051] b) After the reaction, cool to room temperature and adjust the pH to 8 with 1M NaOH solution. Add 0.05 g of sodium bicarbonate foaming agent, and stir at a speed of 500 rpm until a uniform foam form is produ...

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Abstract

The invention belongs to the field of preparation of intelligent corrosion inhibitors, and particularly relates to a preparation method of a pH-controlled-release long-acting intelligent corrosion inhibitor. A using method of the conventional corrosion inhibitor is realized mainly through one-time addition or continuous addition for multiple times, and the concentration of the corrosion inhibitor in an early period is too high, while the concentration of the corrosion inhibitor in a late period is too low, therefore, resource waste is caused, the slow release efficiency is reduced, and even sometimes, the corrosion rate is accelerated, as a result, the invention prepares the pH-controlled-release long-acting intelligent corrosion inhibitor which is a hydrogel-embedded corrosion inhibitor, is sensitive to ambient pH and has a corrosion inhibiting function; and the intelligent corrosion inhibitor can determine the release condition according to different properties of an ambient medium.

Description

[0001] technical field [0002] The invention belongs to the field of preparation of intelligent corrosion inhibitors, in particular to a preparation method of a long-acting intelligent corrosion inhibitor which can be released by pH control. [0003] Background technique [0004] Metal corrosion pervades all areas of life and production, and there are various ways to reduce or prevent metal corrosion. Among them, corrosion inhibitors have been widely used due to their advantages such as simple, fast and economical methods of use. However, the traditional method of using corrosion inhibitors is mostly to use one-time injection or multiple consecutive injections, which makes the concentration of corrosion inhibitors too high at the initial stage of application, even higher than the maximum effective concentration, which is not only a waste of resources, but also sometimes It will reduce the sustained release efficiency and even accelerate corrosion. In the later stage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/14C08F251/00C08J9/08C08J9/28
Inventor 董超芳栗丽肖葵吴俊升雷浩李晓刚
Owner UNIV OF SCI & TECH BEIJING
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