A kind of anticorrosion composite coating and preparation method thereof
A composite coating and marine anti-corrosion technology, applied in anti-corrosion coatings, anti-fouling/underwater coatings, polyurea/polyurethane coatings, etc., can solve the problems of increasing ship energy consumption, potential hazards, and damage to marine anti-corrosion coatings on the bottom of ships
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[0037] In the second aspect, the present application provides a method for preparing a marine anti-corrosion composite coating, comprising the following steps: S1, adding polyether modified silicone oil, tetraethyl orthosilicate hydrolyzate and polyaniline dispersion into polyurethane emulsion and stirring to obtain Mixed emulsion; S2. Add nano-zinc powder, graphite whiskers and polyethylene glycol into the mixed emulsion, stir and mix, and then ultrasonically treat for 10-20 minutes to obtain a marine anti-corrosion composite coating.
[0038] All in all, this application is modified by adding nano-flaky zinc powder and graphene. Since graphene has a fast and excellent electron migration ability, it works synergistically with nano-zinc oxide to fill it into the coating to form a good cathode Protection synergistic effect, meanwhile, the graphene material that this application adopts has good size effect, has very good flexibility through graphene, forms flexible winding and co...
Embodiment 1
[0045] (1) by parts by weight, weigh respectively 20 parts of polyaniline nanopowders with an average particle diameter of 20nm, 2 parts of sodium stearate and 40 parts of water;
[0046] (2) Add polyaniline nano-powder and sodium stearate into deionized water, stir and mix, and then ultrasonicate for 40 minutes under the conditions of frequency 20KHz and power 300W to obtain polyaniline dispersion.
[0047] (3) in parts by weight, respectively weigh 40 parts of polyurethane emulsions with a solid content of 40%, 10 parts of polyaniline dispersions, 8 parts of nano-flaky zinc powders with an average particle diameter of 30nm, 5 parts with an average diameter of 2 μm, and an average Graphene with a length of 20 μm, 0.75 parts of polyethylene glycol, 15 parts of tetraethyl orthosilicate hydrolyzate and 0.2 parts of polyether modified silicone oil;
[0048] (4) adding polyether modified silicone oil, tetraethyl orthosilicate hydrolyzate and polyaniline dispersion into the polyure...
Embodiment 2
[0051] (1) by parts by weight, weigh 25 parts of polyaniline nanopowders with an average particle diameter of 25nm, 2.5 parts of sodium stearate and 50 parts of water respectively;
[0052] (2) Add polyaniline nano-powder and sodium stearate into deionized water, stir and mix, and then perform ultrasonic treatment for 50 min under the conditions of frequency 25KHz and power 400W to obtain polyaniline dispersion.
[0053] (3) in parts by weight, respectively weigh 50 parts of polyurethane emulsions with a solid content of 50%, 15 parts of polyaniline dispersions, 12 parts of nano-flaky zinc powders with an average particle diameter of 45nm, 7 parts with an average diameter of 3 μm, and an average Graphene with a length of 30 μm, 0.9 parts of polyethylene glycol, 17 parts of tetraethyl orthosilicate hydrolyzate and 0.4 parts of polyether modified silicone oil;
[0054] (4) adding polyether modified silicone oil, tetraethyl orthosilicate hydrolyzate and polyaniline dispersion int...
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