Cationic electromigration imidazoline quaternary ammonium salt and application thereof

A kind of permanent imidazoline and cationic technology, which is applied in cationic electromobility imidazoline quaternary ammonium salt and in the field of concrete reinforcement protection, can solve the problems of slow migration speed, dangerous secondary corrosion, and high labor intensity. Achieve the effects of avoiding secondary corrosion, stable chemical properties, and low labor intensity

Inactive Publication Date: 2013-02-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electrochemical method has the following disadvantages: (1) need to be equipped with auxiliary devices, such as electrodes, batteries, etc.; (2) labor-intensive and costly; (3) easily lead to more dangerous "secondary corrosion"
The non-electrochemical method also has the following disadvantages: (1) It can only be added to fres

Method used

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  • Cationic electromigration imidazoline quaternary ammonium salt and application thereof
  • Cationic electromigration imidazoline quaternary ammonium salt and application thereof
  • Cationic electromigration imidazoline quaternary ammonium salt and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] like figure 1 As shown, the device for preparing cationic electromobility imidazoline quaternary ammonium salt in this embodiment includes an iron stand 6, a three-necked flask 3, a collector type constant temperature heating magnetic stirrer 1, and also includes a water separator 4 and a condenser 5; The first flask mouth of the three-necked flask 3 is connected with one end of the water separator 4, and the condenser 5 is arranged on the water separator 4 and connected with the other end of the water separator 4; the second of the three-necked flask 3 The mouth of the flask is a nitrogen gas inlet 10, which is connected with the nitrogen supply pipe, and the mouth of the third flask of the three-necked flask 3 is sealed; xylene is housed in the water separator 4, and the liquid level of the xylene is lower than the extension of the water separator. Out of the lower end of the elbow 5mm.

[0030] The method for preparing cationic electromobility imidazoline quaternary...

Embodiment 2

[0052] This embodiment adopts the same device for preparing cationic electromobility imidazoline quaternary ammonium salt as in the embodiment, and the steps of the preparation method are as follows:

[0053] (1) Using lauric acid and diethylenetriamine at a molar ratio of 1.2:1, acylation reaction at 170°C for 3 hours, followed by cyclization reaction at 200°C for 15 hours, to synthesize imidazoline; into nitrogen.

[0054] (2) The molar ratio of imidazoline and epichlorohydrin is 1.0:1.0, and the cationic reaction is carried out at a temperature of 90 ° C and a pH value of 4. During the reaction, nitrogen gas is introduced, and the reaction time is 7 hours to obtain a cationic Electromobile imidazoline quaternary ammonium salt with the following molecular structure:

[0055]

[0056] Among them, R, R'represent CH 3 (CH 2 ) 10 -, -CH 2 CH 2 NHCO (CH 2 ) 10 CH 3 .

[0057] The infrared spectrogram of the imidazoline prepared by the step (1) of the present embodime...

Embodiment 3

[0060] This embodiment adopts the same device for preparing cationic electromobility imidazoline quaternary ammonium salt as in the embodiment, and the steps of the preparation method are as follows:

[0061] (1) Using lauric acid and diethylenetriamine at a molar ratio of 1:1.1, acylation reaction at 150°C for 4 hours and cyclization reaction at 210°C for 17 hours were used to synthesize imidazoline; into nitrogen.

[0062] (2) The molar ratio of imidazoline and ethylene oxide is 1:1.1, and the cationization reaction is carried out at a temperature of 70 ° C and a pH value of 3 to 4. During the reaction, nitrogen gas is introduced, and the reaction time is 8 hours. Cationic electromobile imidazoline quaternary ammonium salt with the following molecular structure:

[0063]

[0064] Among them, R, R'represent CH 3 (CH 2 ) 10 -, -CH 2 CH 2 NHCO (CH 2 ) 10 CH 3 .

[0065] The infrared spectrogram of the imidazoline prepared by the step (1) of the present embodiment i...

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Abstract

The invention discloses a cationic electromigration imidazoline quaternary ammonium salt which is prepared by the following steps: (1) synthesizing imidazoline from C5-C18 fatty acid and diethylenetriamine; and (2) carrying out cationization reaction on the imidazoline and quaternizing reagent (comprising sodium monochloroacetate, epoxy chloropropane, epoxyethane, chloroacetic acid ethanol ammonium salt and sodium 3-chloro-2-hydroxypropyl sulfonate) in a mol ratio of 1:(1.0-1.2) at 70-90 DEG C under the condition of the pH value 3-4 for 6-8 hours, thereby obtaining the cationic electromigration imidazoline quaternary ammonium salt. When being used in a concrete reinforcing bar corrosion inhibitor, the cationic electromigration imidazoline quaternary ammonium salt can be used for reinforcing bar restoration in new concrete structures and built concrete structures. The restoration belongs to nondestructive restoration, and has the advantages of high migration rate and environment friendliness.

Description

technical field [0001] The invention relates to the field of rust inhibitors, in particular to a cationic electromobility imidazoline quaternary ammonium salt and its application in the field of concrete reinforcement protection. Background technique [0002] Concrete is widely used in construction projects in various fields due to its advantages of low cost, durability, and wide range of material sources, and has become the most widely used material in modern buildings. However, under the action of the environment, various forms of damage and even destruction will occur. Professor Metha pointed out in his keynote report entitled "Concrete Durability—50 Years of Progress" at the Second International Conference on Concrete Durability held in 1991: "The causes of concrete failure in the world today are arranged in descending order of importance. It is: corrosion of steel bars, freezing damage in cold climates, and physical and chemical effects in erosive environments." [00...

Claims

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Application Information

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IPC IPC(8): C07D233/06C07D233/18C04B24/12C04B103/61
Inventor 韦江雄费飞龙余其俊艾志勇胡捷
Owner SOUTH CHINA UNIV OF TECH
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