Waterborne anticorrosion coating composition and process for providing corrosion-resistant coating on metal surface
A corrosion-resistant coating, metal surface technology, used in anti-corrosion coatings, devices for coating liquids on surfaces, coatings, etc., can solve problems such as insufficient adhesion to corrosion-resistant substrates
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example 1
[0163] Blue marine coatings were formulated using Phthalocyanine Blue Millbase (Table 2) and PTFE Millbase (Table 4, Fluoropolymer A) with the formulation (wet add) shown in Table 5 below. A separately prepared white millbase was blended with a blue millbase to match the shade of blue marine paint required by the industry.
[0164] Table 5: Aqua blue monocoat formulation of Example 1
[0165]
[0166] The overall formulation components, including those of the mill base, are shown below (Table 6).
[0167] Table 6: Formulation of Example 1 - Single Coat Blue.
[0168] Example 1
[0169]
[0170] The metal panels were then coated with the coating composition and tested for salt spray corrosion resistance as described above. The blue formulations shown in Table 5 showed good performance on grit blasted CRS panels (untreated) and outperformed comparative commercial coatings (>500 hours) in the ASTM B117 salt spray test. It is then applied to the fastener (zinc phosph...
example 2
[0172] For the blue formulation, reformulation was done in an attempt to improve salt spray performance to achieve 2500 hours of salt spray corrosion resistance (on treated steel). For Blue Marine Coating Example 2, the phenolic resin dispersion was removed and a small molecule melamine crosslinker (hexa-(methoxymethyl)melamine (HM)) was used as the sole crosslinker (Table 8) . Simultaneously, using the blue and white pigments, separate white and blue millbase dispersions were reprepared as a single millbase. The improved blue pigment millbase is shown in Table 7 (and hereinafter referred to as "mixed white / blue millbase").
[0173] Table 7: Mixed White / Blue Mill Base
[0174]
[0175] Table 8: Aqua blue monocoat formulations of Example 2
[0176]
[0177] The overall formulation components, including those of the mill base, are shown below (Table 9).
[0178] Table 9: Formulation for Example 2 - Single Coat Blue.
[0179] Example 2
[0180]
[0181] The m...
example 3
[0192] The initial aqueous red monocoat formulation of Example 3 used a commercially available aqueous fluoropolymer dispersion from FEP that could be blended directly with the red millbase dispersion in Table 12 and other formulation ingredients.
[0193] Table 12: Aqueous red monocoat formulation of Example 3
[0194]
[0195] However, the red marine coating of Example 3 had a lower than target desired gloss and a slightly lower performance COF (target COF, static COF and dynamic COF were all <0.20).
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