Water-based coil coating without amine neutralization

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:
• 53-55%;
• a crosslinking resin:
• 2.5-5.5%;
• a first auxiliary:
• 0.2%;
• a second auxiliary:
• 0.2%;
• a third auxiliary:
• 1.0%;
• and
• a diluent;
• wherein a solid content in the water-based coil coating is greater than 50%, 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 s in a Ford cup #4, the solid content >40 wt. %, a PMT:
• 210-232° C., T-bend:
• 0-2 T, MEK wiping >100 times, gloss at 60 degrees >85%, boiling water resistance >2 h.

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:
• 80-84.2%;
• a crosslinking resin:
• 3.8-8.0%;
• a first auxiliary:
• 0.35%;
• a second auxiliary:
• 0.35%;
• a third auxiliary:
• 1.7%;
• 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 s in a Ford cup #4, the solid content >40 wt. %, a PMT:
• 210-232° C., T-bend:
• 0-2 T, MEK wiping >100 times, gloss at 60 degrees >85%, boiling water resistance >2 h.