Cationic dopamine functionalized graphene water-based anti-corrosive paint as well as preparation method and application thereof
An anti-corrosion coating, graphene water-based technology, applied in anti-corrosion coatings, electrolytic coatings, electrophoretic coatings, etc., to achieve the effects of simple method, simple preparation method, and extended diffusion path
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[0038] In view of the deficiencies in the prior art, the inventor of this case has been able to propose the technical solution of the present invention through long-term research and a large amount of practice, aiming to provide a kind of preparation method of cationic dopamine functionalized graphene water-based anti-corrosion coating and coating thereof, mainly Including graphene modification, graphene ionization, electrolyte configuration, substrate pretreatment, composite coating preparation and other steps. The technical solution, its implementation process and principle will be further explained as follows.
[0039] An aspect of the embodiments of the present invention provides a cationic dopamine functionalized graphene water-based anti-corrosion coating, which includes: a cationic dopamine functionalized graphene material and an aqueous resin emulsion, and the cationic dopamine functionalized graphene material is uniformly dispersed in In the aqueous resin emulsion.
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Embodiment 1
[0086] A cationic dopamine functionalized graphene waterborne epoxy anticorrosion coating and a preparation method thereof, comprising the steps of:
[0087] 1. Graphene modification: Mix dopamine and graphene oxide with a mass ratio of 3:1 in a pH value = 8.5 buffer solution and stir at room temperature for 24 hours to obtain dopamine-functionalized graphene, and then obtain dopamine-functionalized graphene Graphene was vacuum-dried at 40 °C into powder.
[0088] 2. Graphene ionization: Disperse 0.5g of dried dopamine-reduced graphene oxide and 1.35g of acetic acid in 20mL of acetone solution, stir at 28°C for 3h to obtain cationic dopamine-functionalized graphene, and then vacuum-dry at 40°C to form powder.
[0089] 3. Electrolyte solution configuration: Disperse 0.5g of ionized dopamine-reduced graphene oxide in 100g of aqueous cathodic epoxy resin emulsion with a solid content of 15%, and ultrasonically disperse for 30min.
[0090] 4. Steel sheet pretreatment: the size i...
Embodiment 2
[0095] A cationic dopamine functionalized graphene waterborne acrylic anticorrosion coating and a preparation method thereof, comprising the steps of:
[0096] 1. Graphene modification: Mix dopamine and graphene oxide with a mass ratio of 1:100 in a pH value = 8.5 buffer solution and stir at room temperature for 12 hours to obtain dopamine-functionalized graphene, and then obtain dopamine-functionalized graphene Graphene was vacuum-dried at 20 °C into powder.
[0097] 2. Graphene ionization: Disperse 0.5g of dried dopamine-reduced graphene oxide and 0.5g of acetic acid in 12.5mL ethanol solution, stir at 20°C for 1h to obtain cationic dopamine-functionalized graphene, and then vacuum-dry at 20°C into powder.
[0098] 3. Electrolyte solution configuration: Take 0.01g of ionized dopamine-reduced graphene oxide and disperse it in 100g of aqueous cathode acrylic resin emulsion with a solid content of 5%, and disperse it by ultrasonic for 5min.
[0099] 4. Steel sheet pretreatmen...
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