Water-based curtain-coating two-component polyurethane coating and preparation method thereof

[0033] Example 1

[0034] A water-based curtain coating two-component polyurethane coating, including component A and component B;

[0035] The A component includes the following components by mass percentage:

[0036] Waterborne anionic polyurethane dispersion 45%, wetting and dispersing agent 1.2%, defoaming agent 1.2%, pigment 20%, co-solvent 4%, leveling agent 0.6%, thickening agent 0.5% and deionized water 27.5%;

[0037] Among them, the aqueous anionic polyurethane dispersion is Bayer's Dispercoll U53; the wetting and dispersing agent is composed of TEGO 755W and Surfynol 104E with a mass ratio of 3:1; the defoaming agent is composed of BYK028 and TEGO with a mass ratio of 1:1 Airex902 is composed of; the pigment is composed of titanium dioxide and carbon black with a mass ratio of 9:1; the cosolvent is Dow Chemical’s dipropylene glycol methyl ether; the leveling agent is composed of BYK3566 with a mass ratio of 1:1 and Afcona3587 composition; the thickener is Hemmings RHEOLATE 27

[0045] Example 2

[0046] A water-based curtain coating two-component polyurethane coating, including component A and component B;

[0047] The A component includes the following components by mass percentage:

[0048] Waterborne anionic polyurethane dispersion 55%, wetting and dispersing agent 1%, defoaming agent 0.8%, pigment 18%, co-solvent 4.9%, leveling agent 0.5%, thickener 0.3% and deionized water 19.5%;

[0049] Among them, the aqueous anionic polyurethane dispersion is Bayer's Dispercoll U53; the wetting and dispersing agent is composed of TEGO 755W and Surfynol 104E with a mass ratio of 4:1; the defoaming agent is composed of BYK028 and TEGO with a mass ratio of 1:1.2 Airex902; the pigment is composed of titanium dioxide and carbon black with a mass ratio of 8:1; the co-solvent is Dow Chemical’s dipropylene glycol methyl ether; the leveling agent is composed of BYK3566 with a mass ratio of 1.5:1 and Afcona3587 composition; the thickener is Hemmings RHEOLATE 278;

[0050] The B

[0057] Example 3

[0058] A water-based curtain coating two-component polyurethane coating, including component A and component B;

[0059] The A component includes the following components by mass percentage:

[0060] 60% aqueous anionic polyurethane dispersion, 0.8% wetting and dispersing agent, 0.5% defoaming agent, 15% pigment, 5.3% cosolvent, 0.3% leveling agent, 0.2% thickening agent and 17.9% deionized water;

[0061] Among them, the aqueous anionic polyurethane dispersion is Bayer's Dispercoll U53; the wetting and dispersing agent is composed of TEGO 755W and Surfynol 104E with a mass ratio of 5:1; the defoamer is composed of BYK028 and TEGO with a mass ratio of 1:1.5 Airex902 is composed of; the pigment is composed of titanium dioxide and carbon black with a mass ratio of 10:1; the cosolvent is Dow Chemical’s dipropylene glycol methyl ether; the leveling agent is composed of BYK3566 and a mass ratio of 2:1 Afcona3587 composition; the thickener is Hemmings RHEOLATE 278;

[0062]