Water-based non-chrome-zinc-aluminum anticorrosive paint and preparation method thereof
An anti-corrosion coating, zinc-aluminum technology, applied in anti-corrosion coatings, coatings and other directions, can solve the problems of weakened bonding, increased viscosity, difficult to withstand high temperature, etc. good corrosion effect
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Embodiment 1
[0023] The provided anti-corrosion coating is made by mixing A and B components, the mass ratio of A and B components is 1.17:1, among which, A component is composed of zinc powder, aluminum powder, nano-SiO 2 , wetting agent and dispersant, the zinc-aluminum powder is in the form of scales, its average particle size is 10-25 μm, and the thickness is 0.1-0.3 μm; nano-SiO 2 The particle size of the powder is 15-20nm, the wetting agent is dipropylene glycol; the dispersant is nonylphenol polyoxyethylene ether (NP-10). The specific composition is zinc powder 24wt%, aluminum powder 6wt%, wetting agent: 18wt%, dispersant: 5wt%, nano-SiO 2 : 1 wt%.
[0024] Component B is composed of silicone resin emulsion, deionized water, corrosion inhibitor, thickener, adhesion promoter, defoamer, and film-forming aid. The silicone emulsion is benzyl silicone resin. 23wt%, deionized water accounted for 20wt%, corrosion inhibitor 1.0wt%, thickener 0.4wt%, adhesion promoter 1wt%, defoamer 0.5wt%...
Embodiment 2
[0027] The mass ratio of A and B two components is 1.02:1, and the composition of A component is the same as in Example 1, and the specific composition content is: zinc powder: 23wt%, aluminum powder: 6wt%, wetting agent: 16wt%, dispersant : 4wt%, nano-SiO 2 : 1.5wt%.
[0028] The composition of component B is the same as in Example 1, wherein the silicone emulsion is phenylmethyl silicone resin, the addition amount is 24wt%, deionized water accounts for 21.5wt%, corrosion inhibitor: 1.0wt%, thickener: 0.5wt% , Adhesion promoter: 1.5wt%, defoamer: 0.5wt%, film-forming aid, leveling agent and brightener total 0.5wt%.
[0029] Concrete operation steps are with embodiment 1.
[0030] The chromium-free metal anti-corrosion coating made in this example has a volatile organic compound VOCs content of about 22%, can withstand high temperatures of 300°C, and has good anti-corrosion performance. The neutral salt spray resistance of the obtained coating is ≥720h.
Embodiment 3
[0032] The mass ratio of A and B two components is 1.27: 1, and the composition of A component is the same as in Example 1, and the specific composition content is: zinc powder 25wt%, aluminum powder 6.5wt%, wetting agent: 19wt%, dispersant : 5wt%, nano-SiO 2 : 0.5wt%.
[0033] Component B is composed of: silicone resin emulsion: 20wt%, deionized water: 20wt%, corrosion inhibitor: 1.0wt%, thickener: 0.5wt%, adhesion promoter: 2wt%, defoamer: 0.45wt% %, the total amount of film-forming aids, leveling agents and brighteners is 0.05wt%. The A component is fully ground and mixed with the B component, and mechanically stirred for 5-10 hours to obtain the water-based chromium-free zinc-aluminum anticorrosion coating.
[0034] The chromium-free metal anti-corrosion coating made in this example has a volatile organic compound VOCs content of about 27%, can withstand high temperatures of 300°C, and has good anti-corrosion performance. The neutral salt spray resistance of the obtaine...
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