Preparation method and preparation device of cationic electromigration imidazoline concrete reinforcing bar corrosion inhibitor

The invention relates to a technology of concrete reinforcement and imidazoline, which is applied in the field of preparation of a cationic electromobility imidazoline-based concrete reinforcement rust inhibitor, and can solve the problems of low diffusivity of the rust inhibitor, dangerous secondary corrosion, non-destructive repair, and the like. To achieve the effect of not affecting the appearance, avoiding secondary corrosion, and low cost

Active 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 fresh concrete, and it is ineffective for the built concrete structure; (2) It is not a non-destructive repair, and the appearance will be affected after repair; (3) The rust inhibitor has low diffusivity (4) The rust inhibitor itself has a negative impact on the environment, such as the biological toxicity and carcinogenicity of sodium nitrite

Method used

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  • Preparation method and preparation device of cationic electromigration imidazoline concrete reinforcing bar corrosion inhibitor
  • Preparation method and preparation device of cationic electromigration imidazoline concrete reinforcing bar corrosion inhibitor
  • Preparation method and preparation device of cationic electromigration imidazoline concrete reinforcing bar corrosion inhibitor

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Experimental program
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Embodiment 1

[0033] Such as figure 1 As shown, the device for preparing cationic electromobility imidazoline series concrete steel reinforcement rust inhibitor in this embodiment includes an iron frame platform 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. Device 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 three-necked flask 3 The mouth of the second flask is a nitrogen gas inlet 10, which is connected with the nitrogen gas 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 xylene is lower than the water divider The lower end of the elbow protrudes 5mm from the device.

[0034] The method for preparing cationic ...

Embodiment 2

[0056] This embodiment adopts the same device for preparing cationic electromobility imidazoline series concrete steel reinforcement rust inhibitor as in the embodiment, and the steps of the preparation method are as follows:

[0057] (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.

[0058] (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 Electromigratory imidazoline-based concrete steel reinforcement rust inhibitor has the following molecular structure:

[0059]

[0060] Among them, R, R'represent CH 3 (CH 2 ) 10 -, -CH 2 CH 2 NHCO (CH 2 ) 10 CH 3 .

[0061] The infrared spectrogram of the imidazo...

Embodiment 3

[0064] This embodiment adopts the same device for preparing cationic electromobility imidazoline series concrete steel reinforcement rust inhibitor as in the embodiment, and the steps of the preparation method are as follows:

[0065] (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.

[0066] (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 electromobility imidazoline series concrete steel reinforcement corrosion inhibitor, with the following molecular structure:

[0067]

[0068] Among them, R, R'represent CH 3 (CH 2 ) 10 -, -CH 2 CH 2 NHCO (CH 2 ) 10 CH 3 .

[0069] The infrared spectrogram of the imid...

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Abstract

The invention discloses a preparation method of a cationic electromigration imidazoline concrete reinforcing bar corrosion inhibitor, which comprises 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, sodium 3-chloro-2-hydroxypropyl sulfonate and the like) 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 concrete reinforcing bar corrosion inhibitor. The cationic electromigration imidazoline concrete reinforcing bar corrosion inhibitor 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 steel bar corrosion protection in reinforced concrete structures, in particular to a preparation method and a preparation device of a cationic electromigration imidazoline series concrete steel bar rust inhibitor. 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 chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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