| CPC C09D 167/025 (2013.01) [C08K 5/34922 (2013.01); C09D 7/20 (2018.01); C09D 7/61 (2018.01); C09D 7/63 (2018.01); C09D 7/65 (2018.01)] | 6 Claims |
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1. A water-based coil coating without amine neutralization, wherein the water-based coil coating does not comprise amine neutralizing agents and does not use raw materials with heavy metal organic catalysts comprising organotin, and the water-based coil coating comprises the following components in percent by weight:
an amine-free waterborne resin: 88-93%;
a crosslinking resin: 4-9%;
a first auxiliary: 0.5%;
a second auxiliary: 0.5%;
a third auxiliary: 2.0%; and
a diluent; wherein a solid content in the water-based coil coating is greater than 40%, a solid content ratio of the amine-free waterborne resin to the crosslinking resin is in a range of 4-9, the first auxiliary comprises one selected from the group consisting of an organosilicon wetting agent, a polyacrylate wetting leveling agent and a polyester wetting leveling agent, the second auxiliary comprises an alkynediol wetting agent, the third auxiliary comprises an epoxy phosphate ester adhesion promoter or a silane coupling agent adhesion promoter, and the diluent comprises one selected from the group consisting of pure water, distilled water and deionized water;
wherein the water-based coil coating meets the following conditions: viscosity: 80-120 seconds(s) in a Ford cup #4, the solid content >40 weight percent (wt. %), a plate temperature (PMT): 210-232 degrees Celsius (° C.), T-bend: 0-2 torque (T), methyl ethyl ketone (MEK) wiping >100 times, gloss at 60 degrees >85%, boiling water resistance >2 hours (h).
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