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Preparation method of reinforced concrete corrosion inhibitor

A technology of reinforced concrete and rust inhibitor, which is applied in the direction of organic chemistry, etc., can solve the problems of environmental pollution, large usage, corrosion of steel bars, etc.

Inactive Publication Date: 2018-03-06
ZHEJIANG DIHENG IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the rust inhibitors in the current technology are mainly inorganic salts such as nitrite and polyphosphate, and the amount used is too large. If the minimum protection concentration requirement is not met during use, the corrosion of steel bars may be promoted, and sub- Nitrate also has carcinogenic effect, which will cause a great degree of pollution to the environment, so that the application of inorganic salt corrosion inhibitors for steel bars is greatly restricted

Method used

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  • Preparation method of reinforced concrete corrosion inhibitor

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preparation example Construction

[0019] The invention provides a method for preparing a rust inhibitor for reinforced concrete, comprising the following steps: step a) combining 2,4,6-tris(4-carboxyphenyl)-1,3,5-triazine, 1-( Chloromethyl)adamantane and ether are mixed, stirred for reaction, distilled, suction filtered, washed, and vacuum-dried to obtain an ionic liquid; step b) dissolving the ionic liquid in deionized water, adding magnesium hydroxide, and filtering after stirring, The magnesium salt compound is obtained after vacuum distillation and suction filtration; step c) immersing the magnesium salt compound in an aqueous solution of sodium monofluorophosphate, stirring, and vacuum drying to obtain a rust inhibitor for reinforced concrete.

[0020] First, 2,4,6-tris(4-carboxyphenyl)-1,3,5-triazine, 1-(chloromethyl)adamantane and ether were mixed and reacted to form an ionic liquid. In step a, the stirring reaction time is preferably 4-8h, more preferably 5-8h. The mass ratio of the 2,4,6-tris(4-carbo...

Embodiment 1

[0032] 1) Preparation of ionic liquid: Weigh 100 g of 2,4,6-tris(4-carboxyphenyl)-1,3,5-triazine and 120 g of 1-(chloromethyl)adamantane into a two-necked flask, add Solvent diethyl ether 400g, stirred and reacted at room temperature of 25°C for 4h, immediately after the reaction, distilled under reduced pressure, filtered with suction, the product was washed with acetone and ether for 5 times, and then dried in vacuum at 60°C for 12 hours;

[0033] 2) Preparation of metal magnesium salt: Weigh 50 g of the ionic liquid prepared in step 2) and dissolve it in 200 g of deionized water, then add 10 g of magnesium hydroxide, stir at room temperature for 2 hours, acid-base neutralization reaction occurs, and then By filtering, distillation under reduced pressure, and suction filtration, metal magnesium salt is obtained;

[0034] 3) Ion exchange: Soak the metal magnesium salt prepared in step 3) in a 20% aqueous solution of sodium monofluorophosphate, stir for 40 hours to carry out i...

Embodiment 2

[0036] 1) Preparation of ionic liquid: Weigh 100 g of 2,4,6-tris(4-carboxyphenyl)-1,3,5-triazine and 120 g of 1-(chloromethyl)adamantane into a two-necked flask, add Solvent diethyl ether 500g, stir and react at room temperature of 25°C for 5h, immediately after the reaction, distill under reduced pressure, filter with suction, wash the product with acetone and ether for 6 times, and then dry in vacuum at 60°C for 18 hours;

[0037] 2) Preparation of metal magnesium salt: Weigh 50 g of the ionic liquid prepared in step 2) and dissolve it in 300 g of deionized water, then add 10 g of magnesium hydroxide, stir at room temperature for 2.5 hours, and an acid-base neutralization reaction occurs, Afterwards, by filtering, distillation under reduced pressure, and suction filtration, metal magnesium salt is obtained;

[0038] 3) Ion exchange: soak the metal magnesium salt prepared in step 3) in a 25% aqueous solution of sodium monofluorophosphate, stir for 48 hours to carry out ion ex...

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Abstract

The invention provides a preparation method of a reinforced concrete corrosion inhibitor. The preparation method comprises the following steps: mixing 2,4,6-tri(4-carboxyl phenyl)-1,3,5-triazine, 1-(chloromethyl) adamantane and diethyl ether, stirring to react, distilling, conducting suction filtration, washing and drying in vacuum to obtain an ionic liquid, dissolving in deionized water, adding magnesium hydrate, filtering after stirring, distilling at the reduced pressure, and conducting suction filtration to obtain a magnesium salt compound, soaking the magnesium salt compound in an aqueoussolution of sodium monofluorophosphate, stirring, and drying in vacuum to obtain the reinforced concrete corrosion inhibitor. The magnesium ion in the prepared corrosion inhibitor improves the chloride penetration resistance of the concrete; the triazine substance corrosion inhibitor is adsorbed on the surface of a rebar to play a role in inhibiting the corrosion of the rebar; the carboxylate radical and the chloride ion form an adsorption film on the surface of the rebar so as to protect the rebar; and the monofluorophosphate forms a unimolecule protection film on the surface of the rebar, so that the corrosion speed of the rebar is slowed down. In addition, the used materials are nontoxic and harmless, are green, protect the environment, and are environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a preparation method of a rust inhibitor for reinforced concrete. Background technique [0002] Reinforced concrete has become a widely used material in the construction field of modern society due to its low cost, strong and durable structure and wide source of materials. However, due to the performance degradation and premature failure of concrete structures caused by the corrosion of steel bars, it has brought huge economic losses and harm to contemporary society, and is related to issues such as safety, effective use of resources and environmental protection, and even brought negative impacts to society. It is a serious problem that countries all over the world urgently need to solve. The main reasons for the corrosion of steel bars are the carbonation of concrete and the corrosion of chloride ions. Under the condition of high alkalinity, a dense oxide film will ...

Claims

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Application Information

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IPC IPC(8): C04B24/12C07D251/24C04B103/61
CPCC04B24/128C04B2103/61C07D251/24
Inventor 魏亮
Owner ZHEJIANG DIHENG IND CO LTD
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