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Rust-resistant agent for concrete reinforcing bar and preparation method thereof

A technology of concrete steel bar and rust inhibitor, which is applied in the field of concrete steel bar rust inhibitor containing gas phase corrosion inhibitor and its preparation field, can solve the problems of unsatisfactory anti-rust performance and diffusion performance of the rust inhibitor, and achieve excellent rust inhibitor effect , Good migration and diffusion performance, the effect of easy availability of raw materials

Inactive Publication Date: 2013-07-31
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the above-mentioned rust inhibitors have the technical problems of unsatisfactory antirust performance and diffusion performance.

Method used

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  • Rust-resistant agent for concrete reinforcing bar and preparation method thereof
  • Rust-resistant agent for concrete reinforcing bar and preparation method thereof
  • Rust-resistant agent for concrete reinforcing bar and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 14g of adipic acid in a 1000 mL beaker, add 20 mL of deionized water, slowly add 20 g of cyclohexylamine under stirring at room temperature, (the molar ratio of dibasic acid, organic amine and water is as follows: dibasic acid: Organic amine: water (1:2.1:11.6) until the reaction is complete, the solution becomes transparent and clear, then heated and concentrated until an insoluble film appears on the surface of the solution, cooled to room temperature, and filtered to obtain 28g of the solid, which is gas phase corrosion inhibitor 1.

[0031] Weigh 16g (22.0%) of vapor phase corrosion inhibitor 1, 4g (5.5%) of sodium monofluorophosphate and 3g (4.1%) of calcium gluconate in 50mL of deionized water, stir, and adjust the pH to 7~8 with ethanolamine, namely Get steel bar rust inhibitor 1.

Embodiment 2

[0033] Weigh 10g of azelaic acid in a 1000mL beaker, add 15mL of deionized water, slowly add 10g of morpholine under stirring at room temperature, (the molar ratio of dibasic acid, organic amine and water is dibasic acid:organic amine:water 1:2.1:15.7) until the reaction is complete, the solution becomes transparent and clear, then heated and concentrated until an insoluble film appears on the surface of the solution, cooled to room temperature, and filtered to obtain 17g of the solid, which is gas phase corrosion inhibitor 2.

[0034] Weigh 15g (21.1%) gas-phase corrosion inhibitor, 2.4g (5.6%) sodium monofluorophosphate and 2g (2.8%) calcium gluconate, dissolve in 50mL deionized water, stir evenly, adjust the pH to 7~8 with ethanolamine, that is Get steel bar rust inhibitor 2.

Embodiment 3

[0036] Weigh 15g of sebacic acid in a 1000 mL beaker, add 20 mL of deionized water, slowly add 10 g of ethanolamine under stirring at room temperature, (the molar ratio of dibasic acid, organic amine and water is based on dibasic acid:organic amine: Water (1:2.2:15) until the reaction is complete, the solution becomes transparent and clear, then heated and concentrated until an insoluble film appears on the surface of the solution, cooled to room temperature, and filtered to obtain 22g of solids, which is gas phase corrosion inhibitor 3.

[0037] Weigh 20g (26.3%) gas phase corrosion inhibitor, 3.4g (5.3%) sodium monofluorophosphate and 2g (2.6%) calcium gluconate, dissolve in 50 mL deionized water, add, stir, adjust pH to 7~8 with ethanolamine , that is, steel rust inhibitor 3.

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Abstract

The invention discloses a rust-resistant agent for a concrete reinforcing bar and a preparation method thereof. The rust-resistant agent for the concrete reinforcing bar is prepared based on a gas-phase corrosion inhibitor prepared by reacting a dicarboxylic acid with organic amine. The rust-resistant agent for the concrete reinforcing bar comprises the following raw materials in percentage by mass: 5 to 10 percent of sodium monofluorophosphate, 2 to 5 percent of calcium gluconate, 20 to 40 percent of the gas-phase corrosion inhibitor and the balance of water. The rust-resistant agent for theconcrete reinforcing bar of the invention does not comprise nitrite, comprises the gas-phase corrosion inhibitor and has a function of migrating and diffusing in the concrete. Compared with the traditional rust-resistant agent for the reinforcing bar, the rust-resistant agent for the concrete reinforcing bar has the advantages of excellent corrosion inhibition and rust-resistant properties, high environmentally-friendly property and the like, can be widely applied to fresh reinforced concrete construction of harbour engineering, coastal buildings, buildings in saline and alkaline lands and other buildings with the requirements of preventing the concrete reinforcing bar from rust and corrosion, and can also be applied to the repair of the reinforced concrete structures in major construction projects and routine maintenance.

Description

technical field [0001] The invention relates to a concrete steel bar rust inhibitor and a preparation method thereof, in particular to a concrete steel bar rust inhibitor containing a vapor phase corrosion inhibitor and a preparation method thereof. Background technique [0002] Reinforced concrete structure is an economical and practical structural material, which is widely used in the construction of major projects such as bridges, submarine tunnels and large ocean platforms. Usually, the design life of major basic projects is as long as 100 years. The premature failure of concrete structures not only causes serious economic losses, but also sometimes brings major social harm and environmental disasters. Concrete is carbonized or attacked by corrosive ions (such as Cl-), and the concrete reinforcement will be corroded. Corrosion of steel bars is one of the main causes of damage to concrete structures. The impact of steel bar corrosion on the performance of reinforced con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/12C04B103/61
Inventor 张大全高立新吴欢辛志玲
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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