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Imidazole ionic liquid electromigration antirust agent and preparation method thereof

An electromigration and ionic liquid technology, applied in the field of building materials, can solve problems such as unsatisfactory rust inhibition effect and slow migration, and achieve the effects of excellent rust inhibition efficiency, simple synthesis method, and cheap and easy-to-obtain raw materials.

Active Publication Date: 2016-10-12
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the increasing thickness and compactness of the protective layer of reinforced concrete structures, the existing migratory rust inhibitors have the problems of slow migration and unsatisfactory rust inhibitory effects. The purpose of the present invention is to provide an environmentally friendly rust inhibitor with a wider application range. At the same time, the present invention also provides a preparation method of the rust inhibitor, the method is easy to synthesize, the obtained molecular structure is diverse, and the reaction conditions are mild

Method used

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  • Imidazole ionic liquid electromigration antirust agent and preparation method thereof
  • Imidazole ionic liquid electromigration antirust agent and preparation method thereof
  • Imidazole ionic liquid electromigration antirust agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0026] 54g of imidazole (0.8mol) was added into the round bottom flask, followed by the addition of 5g of tetrabutylammonium bromide (0.016mol) and 150mL of 30% NaOH solution, and 136g of methyl iodide (0.96mol) was added dropwise under stirring, at 40°C Under reaction 24h. After the reaction, the reaction solution was extracted three times with ethyl acetate, the organic phase was washed three times with saturated brine, the organic phase was collected, and the solvent was evaporated under reduced pressure to obtain N-methylimidazole.

[0027] The prepared N-methylimidazole was dissolved in 150mL of ethanol, and 64g of chloroethanol (0.8mol) was added, 78 ℃ Reaction 24h. After the reaction was finished, the solvent was evaporated, the product was washed 3 times with ethyl acetate, and dried in an oven to obtain the imidazole ionic liquid electromigration rust inhibitor, which had the following molecular structure:

[0028]

[0029] The chemical structural formula was cha...

Embodiment 2

[0031] 54g imidazole (0.8mol) was added in the round-bottomed flask, then 7g tetrabutylammonium bromide (0.022mol) and 150mL 30% NaOH solution were added successively, and 120g n-bromobutane (0.88mol) was added dropwise under stirring condition, Reaction at 50°C for 12h. After the reaction, the reaction solution was extracted three times with ethyl acetate, the organic phase was washed three times with saturated brine, the organic phase was collected, and the solvent was evaporated under reduced pressure to obtain N-butylimidazole.

[0032] The obtained N-butylimidazole was dissolved in 150mL of acetonitrile, 108g of benzyl chloride (0.85mol) was added, and 82 ℃ Reaction 36h. After the reaction was finished, the solvent was evaporated, the product was washed 3 times with ethyl acetate, and dried in an oven to obtain the imidazole ionic liquid electromigration rust inhibitor, which had the following molecular structure:

[0033]

[0034] The chemical structural formula was...

Embodiment 3

[0036] 54g imidazole (0.8mol) was added in the round-bottomed flask, then 8g tetrabutylammonium bromide (0.024mol) and 150mL 30% NaOH solution were added successively, and 109g n-bromobutane (0.8mol) was added dropwise under stirring condition, Reaction at 50°C for 18h. After the reaction, the reaction solution was extracted three times with ethyl acetate, the organic phase was washed three times with saturated brine, the organic phase was collected, and the solvent was evaporated under reduced pressure to obtain N-butylimidazole.

[0037] The prepared N-butylimidazole was dissolved in 150 mL of acetonitrile, 93 g of sodium chloroacetate (0.8 mol) was added, and the pH was adjusted with 10% NaOH aqueous solution to keep it at 7-8,82 ℃ Reaction 48h. After the reaction was finished, the solvent was evaporated, the inorganic salt was filtered out, the product was washed 3 times with ethyl acetate, and dried in an oven to obtain the imidazole ionic liquid electromigration rust in...

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Abstract

The invention discloses an imidazole ionic liquid electromigration antirust agent and a preparation method thereof. By the electromigration antirust agent, a perssad which has static effect or coordination on iron is introduced on an imidazole ring, and adsorption capacity can be improved, so that the antirust efficiency is improved effectively. The preparation method comprises the following steps: (1) preparing N-alkyl substituted imidazole by using imidazole and halohydrocarbon of C1-C12; and (2) reacting the N-alkyl substituted imidazole with a quaternized reagent to obtain the imidazole ionic liquid electromigration antirust agent. The synthesis method of the imidazole ionic liquid electromigration antirust agent provided by the invention is simple, harsh conditions are not required, antirust efficiency is excellent, the antirust agent can be migrated into a test piece under the effect of an electric field, and volume of migration is not affected by the pH value of the test piece.

Description

technical field [0001] The invention relates to an imidazolium ionic liquid electromigration rust inhibitor and a preparation method thereof, belonging to the field of building materials. technical background [0002] Reinforced concrete is the most widely used building material at present. The long life and high durability of concrete are still a major problem that has not been overcome. Among the many factors affecting the durability of concrete, the corrosion of steel bars is considered to be the primary reason. Under normal circumstances, the strong alkaline environment formed by the hydration of cement forms a dense passivation film on the surface of the steel bars embedded in it, and there will be no corrosion. However, with the increase of the service time of the concrete structure, the internal alkalinity becomes lower, and at the same time, under the joint action of harmful ions such as chloride ions and water and oxygen, the passivation film is gradually destroyed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12C04B103/61
CPCC04B24/128C04B2103/61
Inventor 赵旦蔡景顺石亮姜骞刘建忠沙建芳穆松
Owner JIANGSU SOBUTE NEW MATERIALS
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