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Graphene modified water-based epoxy coating reinforcing steel bar as well as preparation method thereof

A graphene-modified, water-based epoxy technology, applied in the field of steel anti-corrosion, can solve the problems of easy damage of epoxy resin powder, weak corrosion resistance, insufficient bonding strength, etc., to avoid excessive zinc powder content and good anti-corrosion performance effect

Active Publication Date: 2018-10-16
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it uses organic solvents, which have a greater impact on the environment
[0006] To sum up, these methods reported in the existing literature have improved the traditional electrostatic spraying epoxy resin powder in terms of easy damage, weak corrosion resistance, insufficient bonding strength, and inconvenient construction, but there are still some problems. Unstable anti-corrosion performance, low adhesion, environmental pollution, etc.

Method used

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  • Graphene modified water-based epoxy coating reinforcing steel bar as well as preparation method thereof
  • Graphene modified water-based epoxy coating reinforcing steel bar as well as preparation method thereof
  • Graphene modified water-based epoxy coating reinforcing steel bar as well as preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] Prepare 100g of paint

[0104] Graphene dispersion: prepare 100ml of 10mg / ml polyvinylpyrrolidone solution, add 0.2g of graphene and 0.2g of water-based coupling agent, ultrasonically disperse in an ice-water bath for 12 hours, after standing for 24 hours, centrifuge at high speed for 60min, and take the supernatant liquid to obtain a graphene dispersion.

[0105] Add 72.33g of water-based epoxy resin emulsion to 15ml of graphene dispersion to obtain a mixed solution, add 0.50g of defoamer, 1.50g of wetting and dispersing agent, and 1.0g of leveling agent in sequence under high-speed stirring, and stir for 30 minutes at high speed, according to actual needs Add vacuum to evaporate excess water or add appropriate amount of water to dilute to obtain A component.

[0106] Under high-speed stirring, add 0.6 anti-sedimentation thixotropic agent and 0.2 g water-based coupling agent in sequence to 23.29 g of modified polyamine curing agent (G-602), and stir at high speed for ...

Embodiment 2

[0110] Prepare 100g of paint

[0111] Graphene dispersion: prepare 100ml of 10mg / ml polyvinylpyrrolidone solution, add 0.2g of graphene and 0.2g of water-based coupling agent, ultrasonically disperse in an ice-water bath for 12 hours, after standing for 24 hours, centrifuge at high speed for 60min, and take the supernatant liquid to obtain a graphene dispersion.

[0112] Add 68.69 g of water-based epoxy resin emulsion to 20ml of graphene dispersion to obtain a mixed solution, add 0.47g of defoamer, 1.42g of wetting and dispersing agent, and 0.95g of leveling agent in sequence under high-speed stirring, stir at high speed for 30min, and add according to actual needs Evaporate excess water in vacuo or add appropriate amount of water to dilute to obtain component A.

[0113] Under high-speed stirring, 0.4 anti-sedimentation thixotropic agent, 0.2 g water-based coupling agent were sequentially added to 22.12 g of modified polyamine curing agent, and stirred at high speed for 30 m...

Embodiment 3

[0117] Prepare 100g of paint, graphene dispersion: prepare 100ml of 10mg / ml polyvinylpyrrolidone solution, add 0.2g of graphene and 0.2g of water-based coupling agent, ultrasonically disperse in an ice-water bath for 12 hours, after standing for 24 hours, centrifuge at high speed for 60min , take the supernatant to obtain a graphene dispersion.

[0118] Add 67.76g of water-based epoxy resin emulsion to 25ml of graphene dispersion to obtain a mixed solution, add 0.47g of defoamer, 1.40g of wetting and dispersing agent, and 0.94g of leveling agent in sequence under high-speed stirring, and stir for 30 minutes at high speed, according to actual needs Add vacuum to evaporate excess water or add appropriate amount of water to dilute to obtain A component.

[0119] Under high-speed stirring, 0.6 anti-sedimentation thixotropic agent, 0.2 g water-based coupling agent were sequentially added to 21.82 g of modified polyamine curing agent, and stirred at high speed for 30 minutes to obta...

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Abstract

The invention belongs to the field of reinforcing steel bar corrosion-resistant metal and particularly discloses a graphene modified water-based epoxy coating reinforcing steel bar. The graphene modified water-based epoxy coating reinforcing steel bar comprises a reinforcing steel bar and a corrosion-resistant coating adhering to the surface of the reinforcing steel bar; the corrosion-resistant coating is obtained by curing water-based epoxy anti-rust coating; the water-based epoxy anti-rust coating comprises a component A, a component B and a component C; the component A comprises water-basedepoxy resin emulsion, a leveling agent, a defoaming agent, a wetting dispersing agent, a water-based coupling agent a and graphene; the component B comprises a curing agent, an anti-settling thixotropic agent and a water-based coupling agent b; the component C is a corrosion-resistant filler, namely a mixed material of rare earth materials, composite iron titanium powder, zinc powder and aluminumpowder; the grain diameter of the composite iron titanium powder is greater than or equal to that of zinc powder, the grain diameter of the zinc powder is greater than or equal to that of aluminum powder, and the grain diameter of the aluminum powder is greater than that of rear earth materials. The water-based epoxy coating reinforcing steel bar prepared according to the method is environmentally friendly, high in corrosion resistance and convenient and rapid in construction, and can be used for repairing defects.

Description

Technical field: [0001] The invention belongs to the technical field of steel anticorrosion, and in particular relates to a water-based epoxy-coated steel bar. Background technique: [0002] Reinforced concrete structures are the most widely used, economical and durable materials in engineering. The alkaline environment in concrete can protect the steel bars very well, but when the concrete is cracked or neutralized, the steel bars in the concrete are prone to corrosion, which affects the load-bearing performance and durability of the entire structure. Corrosion of steel bars has brought huge economic losses and potential safety hazards to projects, and the use of coated steel bars is one of the practical and effective methods in current projects. [0003] Epoxy resin coatings are widely used in the construction field. At present, the construction method of electrostatic spraying epoxy resin powder is mainly used for coated steel bars. This method has high requirements for ...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D5/10C09D7/61B05D5/00B05D7/24B05D7/14B05D3/00
CPCB05D3/002B05D5/00B05D7/14B05D7/24B05D2202/10B05D2504/00B05D2601/20B05D2601/22B05D2601/28B05D2602/00C08K2003/0856C08K2003/321C08K2201/003C08K2201/014C09D5/103C09D5/106C09D7/61C09D7/67C09D7/70C09D163/00C08K13/04C08K7/00C08K3/042C08K3/08C08K3/32C08K3/36
Inventor 卫军董荣珍刘教培范国强张敏吴素芹贺婉
Owner CENT SOUTH UNIV
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