Reinforcing steel bar inhibitor and preparation method thereof

The technology of steel bar rust inhibitor and sodium benzoate, applied in the field of building materials, can solve the problems of unstable passivation film on the surface of steel bars, pitting corrosion of steel bars, etc., and achieve the effects of avoiding the decline of the protection effect, slowing the penetration, and reducing the dosage.

Inactive Publication Date: 2015-05-06
青建集团股份公司
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Problems solved by technology

But as time goes by, due to the carbonation of the concrete caused by the intrusion of CO2, the alkalinity of the concrete pore fluid decreases, and the passive film on th...

Method used

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  • Reinforcing steel bar inhibitor and preparation method thereof
  • Reinforcing steel bar inhibitor and preparation method thereof

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Embodiment Construction

[0012] The rust inhibitor for steel bars of the present invention comprises the following components, 12 parts of sodium benzoate, 3 parts of sodium silicate, 3 parts of gluconic acid, 1 part of citric acid, 3 parts of thiourea, 6 parts of dicyclohexylamine nitrite, pulverized coal Ash 8 parts, nitrite 15 parts, sodium hexametaphosphate 4 parts, diethylenetriamine 7 parts, thiourea 5 parts, sodium benzoate 2 parts, urotropine 2 parts.

[0013] The method of steel bar rust inhibitor of the present invention comprises the following steps,

[0014] (1) Mix 12 parts of sodium benzoate, 3 parts of sodium silicate, 3 parts of gluconic acid, 1 part of citric acid and 3 parts of thiourea, adjust the pH to 3~4 with 10% hydrochloric acid, and heat to 110~ 120°C, react for 10 hours, distill off the reaction water to obtain the crude product;

[0015] (2) Add the crude product obtained in step (1) to 4% NaOH aqueous distilled water and wash until neutral;

[0016] (3) Add 6 parts of dic...

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Abstract

The invention relates to a reinforcing steel bar inhibitor. The reinforcing steel bar inhibitor is prepared from the following components: 12 parts of sodium benzoate, 3 parts of sodium silicate, 3 parts of gluconic acid, 1 part of citric acid, 3 parts of thiourea, 6 parts of dicyclohexylaminenitrite, 8 parts of coal ash, 15 parts of nitrite, 4 parts of sodium hexametaphosphate, 7 parts of diethylenetriamine, 5 parts of thiourea, 2 parts of sodium benzoate and 2 parts of urotropin. The inhibitor provided by the invention is good in adaptability to cement, so that the performances of concrete can be improved properly; the permeation of a slow release medium into concrete is slowed down; meanwhile, a layer of compact chemical adsorption membrane can be formed on the surface of a reinforcing steel bar; a corrosion medium in a concrete pore solution and oxygen are insulated from being in direct contact with the reinforcing steel bar, so that the electrochemical corrosion cannot be carried out, thereby preventing the corrosion effect to the reinforcing steel bar.

Description

technical field [0001] The invention relates to a building material, in particular to a steel bar rust inhibitor and a preparation method thereof. Background technique [0002] As an economical and practical structural material, reinforced concrete is widely used in structures such as bridges, buildings, dams, subsea tunnels and large ocean platforms. Corrosion of steel bars in concrete has become the main factor affecting the durability of reinforced concrete structures in the world today. In newly-built reinforced concrete, due to the existence of high-alkalinity pore fluid, a passivation film will be formed on the surface of the steel bar to protect the steel bar. But as time goes by, due to the carbonation of the concrete caused by the intrusion of CO2, the alkalinity of the concrete pore fluid decreases, and the passive film on the surface of the steel bar becomes unstable. If the chloride ions in the surrounding medium penetrate to the surface of the steel bar, it...

Claims

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Application Information

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IPC IPC(8): C04B24/16C04B103/61
Inventor 张同波
Owner 青建集团股份公司
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