Environment-friendly water-based bi-component polyurethane steel-structure anti-corrosion finish paint and preparation method
A two-component polyurethane, environmentally friendly technology, applied in polyurea/polyurethane coatings, anti-corrosion coatings, coatings, etc., can solve the problems of poor water resistance, low hardness and gloss, and achieve improved safety, excellent adhesion, Strong acid and alkali resistance
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[0039] Embodiment 1:
[0040] The following raw materials were weighed by weight: 58 parts by weight of hydroxyl-containing aqueous resin emulsion, 33 parts by weight of titanium dioxide, 2 parts by weight of defoamer, 1 part by weight of dispersant, and 10 parts by weight of water. Titanium dioxide adopts R-930, defoamer adopts BYK-028, and dispersant adopts BYK-190.
[0041] Under stirring at 1000-1500r / min, titanium dioxide, dispersant and water were mixed and added to 58 parts by weight of hydroxyl-containing aqueous resin emulsion in turn, and 2 parts by weight of defoaming agent were added to disperse the pigment below 20 microns, and then in 1 part by weight of wetting agent was added at a stirring speed of 300r / min-500r / min, and the wetting agent was BYK-345. Stir well, and obtain component A after filtration.
[0042] Add 80 parts by weight of curing agent (the weight ratio of self-emulsifying polyisocyanate and hydrophobic polyisocyanate is 4:1) into 20 parts by we...
Example Embodiment
[0058] Example 2:
[0059] The following raw materials were weighed by weight: 58 parts by weight of hydroxyl-containing aqueous resin emulsion, 33 parts by weight of titanium dioxide, 3 parts by weight of carbon black, 1 part by weight of defoamer, 0.5 part by weight of dispersant, and 17 parts by weight of water. Titanium dioxide adopts R-930, defoamer adopts BYK-028, and dispersant adopts BYK-190.
[0060] Under stirring at 1000-1500r / min, titanium dioxide, carbon black, dispersant and water were mixed and added to 58 parts by weight of hydroxyl-containing aqueous resin emulsion in turn, and 1 part by weight of defoamer was added to disperse the pigment below 20 microns , and then add 0.5 parts by weight of wetting agent at a stirring speed of 300r / min-500r / min, and the wetting agent adopts BYK-345. Stir well, and obtain component A after filtration.
[0061] Add 82 parts by weight of curing agent (the weight ratio of self-emulsifying polyisocyanate and hydrophobic polyis...
Example Embodiment
[0077] Example 3:
[0078] Weigh the following raw materials by weight: 55 parts by weight of hydroxyl-containing aqueous resin emulsion, 27 parts by weight of titanium dioxide, 2 parts by weight of plain blue, 1 part by weight of defoamer, 1 part by weight of dispersant, and 10 parts by weight of water. Titanium dioxide adopts R-930, defoamer adopts BYK-028, and dispersant adopts BYK-190.
[0079] Under stirring at 1000-1500r / min, mix titanium dioxide, plain blue, dispersant and water into 55 parts by weight of hydroxyl-containing aqueous resin emulsion in turn, and add 1 part by weight of defoamer to disperse the pigment to below 20 microns , and then add 0.5 parts by weight of wetting agent at a stirring speed of 300r / min-500r / min, and the wetting agent adopts BYK-345. Stir well, and obtain component A after filtration.
[0080] Add 80 parts by weight of curing agent (the weight ratio of self-emulsifying polyisocyanate and hydrophobic polyisocyanate is 4:1) into 20 parts ...
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