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Concrete rust inhibitor and preparation method thereof

A technology of concrete rust inhibitor and catalyst, which is applied in the field of concrete rust inhibitor, can solve the problems that the adsorption performance of hydroxyl group is not as good as that of nitrogen atom, and accelerate the dissolution of iron, etc., and achieve the effects of convenient implementation, improved corrosion resistance performance, and simple synthesis process

Active Publication Date: 2014-10-29
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, relying solely on hydroxyl complex adsorption has the following defects: excessive hydroxyl content will promote the complexation of polyols and iron atoms, and accelerate the dissolution of iron; and the adsorption performance of hydroxyl is not as good as that of nitrogen atoms. The antirust efficiency of this kind of rust inhibitor is below 90%.

Method used

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  • Concrete rust inhibitor and preparation method thereof
  • Concrete rust inhibitor and preparation method thereof
  • Concrete rust inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Take 18.5g epichlorohydrin and join in the reactor that 10ml water is housed, keep reaction temperature 20 ℃, add 21g diethanolamine and 0.27g AlCl while stirring 3 (The molar ratio of the three substances, 1:1:0.001), after reacting for 10 hours, add 9 g of dimethylamine, continue to stir and react for 2 hours, then stop stirring, add 10 mL of 30% NaOH solution and stir evenly. The excess water and reactants are distilled off under reduced pressure, and after the crystals are precipitated, the product is obtained by suction filtration under reduced pressure.

[0045] The yield of the above product was determined to be 93% by liquid chromatography. The above product was purified by column chromatography (using silica gel as a filler, and the eluent was mixed with acetone and ethyl acetate, wherein the volume ratio of acetone and ethyl acetate was 1:10), and then analyzed by H NMR, Infrared spectrum characterization confirmed the structure, the results are as follows: ...

Embodiment 2

[0051] Get 18.5g epichlorohydrin and join in the reactor that 10ml methanol is housed, after being warmed up to 60 ℃, add 21g diethanolamine and 0.54g zinc dichloride (three kinds of material molar ratios, 1: 1: 0.002 ), kept the reaction temperature at 60° C. for 8 hours, added dropwise 22.2 g of di-n-propylamine and continued stirring for 4 hours, then stopped heating. After cooling, add 10 mL of 30% NaOH solution and stir evenly, distill off excess water and reactants under reduced pressure, and after the crystals are precipitated, filter under reduced pressure to obtain the product.

[0052] The yield of the above product was determined to be 91% by liquid chromatography. The above product was purified by column chromatography (using silica gel as a filler, and the eluent was mixed with acetone and ethyl acetate, wherein the volume ratio of acetone and ethyl acetate was 1:15), and then analyzed by H NMR, Infrared spectrum characterization confirmed the structure, the resu...

Embodiment 3

[0058] Get 18.5g epichlorohydrin and join in the reactor that 5ml ethanol and 5ml water are housed, after being warmed up to 100 ℃, add 25.2g diethanolamine and 1.63g iron trichloride (three kinds of material mol ratios, 1 : 1.1: 0.005), keep the reaction temperature at 100°C for 6h, add 36g of ethylenediamine dropwise and continue stirring for 8h, then stop heating, add 10mL of 30% NaOH solution after cooling and stir evenly. The excess water and reactants are distilled off under reduced pressure, and after the crystals are precipitated, the product is obtained by suction filtration under reduced pressure.

[0059] The yield of the above product was determined to be 92% by liquid chromatography. The above product was purified by column chromatography (using silica gel as a filler, and the eluent was mixed with acetone and ethyl acetate, wherein the volume ratio of acetone and ethyl acetate was 1:10), and then analyzed by H NMR, Infrared spectrum and gas chromatography-mass s...

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Abstract

The invention discloses a concrete corrosion inhibitor and a preparation method thereof. The corrosion inhibitor is a compound with a 1-dihydroxyethyl amino-3-alkylamino-2-propanol structure and is prepared by two-step reaction. The method comprises the following steps of: reacting an epoxy derivative with diethanolamine under the action of a catalyst, reacting a product with organic amine, neutralizing a product, distilling, and performing suction filtering to obtain liquid, namely the corrosion inhibitor. The synthesis process is simple, and the prepared corrosion inhibitor has the advantages of high efficiency, corrosion inhibition, environment friendliness, high dispersibility and the like, and does not have any adverse effect on the performance of concrete.

Description

technical field [0001] The invention relates to a concrete rust inhibitor, which belongs to the technical field of building materials. Background technique [0002] Reinforced concrete works account for a large proportion of infrastructure, and it is of great significance to protect them from damage. The main factor affecting the durability of concrete is the corrosion of steel bars in concrete structures. Preventing and controlling the corrosion of steel bars is the key to ensuring the safety and durability of structures in service. Especially under environmental conditions such as ocean and deicing salt, chloride ions penetrate into the surface of steel bars through concrete pores, and when the concentration reaches about 0.4%, it can destroy the stability of the passivation film and accelerate the corrosion of steel bars. The rust inhibitor is one of the effective, economical and convenient methods to solve this problem. [0003] Rust inhibitors were first used in reinf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C215/18C04B24/12C07C213/04C04B103/61
Inventor 缪昌文蔡景顺陈翠翠刘加平刘建忠
Owner JIANGSU SOBUTE NEW MATERIALS