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A water-based metal surface treatment agent based on graphene composite

A technology of metal surface treatment and graphene compounding, applied in coatings, polyurea/polyurethane coatings, anti-corrosion coatings, etc., can solve problems such as failure to fully exert the anti-corrosion effect of single-layer graphene, environmental hazards, and difficulty in uniform dispersion. Achieve excellent water dispersion stability

Active Publication Date: 2019-09-13
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hexavalent chromium is a carcinogen and has serious harm to the human body and the environment, while phosphating treatment will produce a large amount of waste residue and waste water, which will cause serious pollution to the environment
However, because graphene is easy to accumulate and its surface is highly hydrophobic, it is difficult to disperse evenly in water-based resins, so solvent-based systems or graphene oxide are often used.
Although graphene is used as a filler in anti-corrosion coatings, it fails to fully exert the anti-corrosion effect of single-layer graphene, and the water-based treatment agent for metal surfaces requires high solution stability. Therefore, the dispersion stability of graphene in the water phase especially important

Method used

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  • A water-based metal surface treatment agent based on graphene composite
  • A water-based metal surface treatment agent based on graphene composite
  • A water-based metal surface treatment agent based on graphene composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The mass percent of the water-based metal surface treatment agent is: functionalized graphene, 0.01%; organosiloxane modified resin, 15%; phytic acid, 0.4%; ammonia water, appropriate amount; the balance is deionized water. The pH value of the surface treatment agent is 5.

[0032] Disperse 0.25 g of styrene-maleic anhydride copolymer (SMA1000, SARTOMER, USA) in 1 L of aqueous solution, adjust the pH of the solution to 10 with sodium hydroxide, and stir for 4 h at 90 ° C to make the solution transparent , cooled to room temperature and used as an electrolyte, using high-purity graphite rods as cathode and anode, and applying a constant voltage DC power supply of 12V for 16 hours to obtain a black functionalized graphene aqueous dispersion. Adjust the pH value of the graphene aqueous dispersion to about 8 with ammonia water, sonicate in an ultrasonic disperser for 2 hours, and centrifuge in a low-speed centrifuge at 2000 rpm to remove large aggregates to obtain the funct...

Embodiment 2

[0034] The components and mass percentages of the water-based metal surface treatment agent are: functionalized graphene, 0.03%; polyurethane, 25%; sodium metavanadate, 0.1%; acetic acid, appropriate amount; the balance is deionized water. The surface treatment agent has a pH value of 7.

[0035] Disperse 0.2 g of styrene-maleic anhydride copolymer (SMA1000, SARTOMER, USA) in 1 L of aqueous solution, adjust the pH of the solution to 11 with sodium hydroxide, and stir for 4 h at 90 ° C to make the solution transparent , cooled to room temperature and used as an electrolyte, using high-purity graphite rods as cathode and anode, and applying a constant voltage DC power supply of 10V to electrolyze for 20h to obtain a black functionalized graphene aqueous dispersion. Adjust the pH value of the graphene aqueous dispersion to about 8 with ammonia water, sonicate in an ultrasonic disperser for 2 hours, and centrifuge in a low-speed centrifuge at 2000 rpm to remove large aggregates to...

Embodiment 3

[0037] The mass percent of the water-based metal surface treatment agent is: functionalized graphene, 0.08%; acrylate resin, 20%; sodium molybdate, 0.04%; acetic acid, appropriate amount; the balance is deionized water. The pH value of the surface treatment agent is 8.

[0038] Disperse 0.5 g of styrene-maleic anhydride copolymer (SMA2000, SARTOMER, USA) in 1 L of aqueous solution, adjust the pH of the solution to 10 with sodium hydroxide, and stir for 4 h at 90 ° C to make the solution transparent , cooled to room temperature and used as an electrolyte, using high-purity graphite rods as cathode and anode, and applying a constant voltage DC power supply of 15V to electrolyze for 14 hours to obtain a black functionalized graphene aqueous dispersion. Adjust the pH value of the graphene aqueous dispersion to about 8 with ammonia water, sonicate in an ultrasonic disperser for 2 hours, and centrifuge in a low-speed centrifuge at 2000 rpm to remove large aggregates to obtain the fu...

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Abstract

The invention discloses a water-based metal surface treatment agent based on graphene composition and belongs to the technical field of metal surface treatment. The water-based metal surface treatment agent is prepared by the following steps of: compositing styrene-maleic anhydride copolymer, namely functionalized-graphene aqueous dispersion, synthesized by a polymer-assisted electrochemical method and organic resin and adding an inorganic corrosion inhibitor for composition. The surface treatment agent comprises the following components in percentage by weight: 0.01-0.1% of functionalized graphene, 15-25% of organic resin, 0-0.6% of inorganic corrosion inhibitor, proper amount of pH regulator and the balance of deionized water. The styrene-maleic anhydride copolymer prepared by the invention has excellent aqueous-dispersion stability, and due to a unique laminated structure, a large specific surface area and functional groups on the surface, a layer of protective membrane with excellent corrosion resistance can be formed on the metal surface by synergistic effect with the organic resin and the inorganic corrosion inhibitor.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to an environment-friendly surface treatment agent for improving metal corrosion resistance. Background technique [0002] Metal materials generally need to be surface treated to form a dense and stable film on the surface to improve their corrosion resistance, surface gloss and anti-pollution ability. Phosphating and chromate passivation are commonly used for metal surface treatment. Hexavalent chromium is a carcinogen and has serious harm to the human body and the environment, while phosphating treatment will produce a large amount of waste residue and waste water, which will cause serious pollution to the environment. Therefore, it is a very urgent task for metallurgical enterprises to adopt environmentally friendly green treatment methods to replace phosphating or chromate passivation surface treatment technologies. [0003] Graphene is a two-dimens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D133/00C09D175/04C09D183/04C09D5/08C09D7/62C23F11/02C23F11/18
Inventor 陈均卢海艳陈宇陶祯臻
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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