Aqueous coating material composition, coating film, and article

Abstract

The present invention addresses the problem of providing an aqueous coating material wherein even when the hydrophobic solvent content is small or zero, phase separation does not occur during storage of the aqueous coating material, and the water-resistant adhesion of a coating film and the water-resistant swelling resistance and the sagging resistance of the coating film are good.　This aqueous coating material composition includes a coating film forming resin, a curing agent, a viscosity agent, and a pigment, wherein the viscosity agent includes at least one substance selected from the group consisting of a carboxyvinyl polymer and a diutan gum, the viscosity agent content is 0.01-0.7 mass% relative to the total mass of the aqueous coating material composition, and a prescribed viscosity steady-state value η1 of the aqueous coating material composition is 0.10 Pa∙s or greater.

Claims

1. An aqueous coating composition comprising a film-forming resin, a curing agent, a viscous agent, and a pigment, wherein the viscous agent comprises at least one selected from the group consisting of carboxyvinyl polymer and dieutan gum, the content of the viscous agent is 0.01 to 0.7% by mass relative to the total mass of the aqueous coating composition, and the aqueous coating composition is subjected to a shear rate of 10 s at 23°C. －１ A water-based paint composition in which the steady-state viscosity η1 measured during steady-state flow measurement of shear deformation is 0.10 Pa·s or higher.

2. The aqueous paint composition according to claim 1, wherein the VOC content [ρ(VOC)] of the aqueous paint composition is 420 g / L or less.

3. The aqueous paint composition according to claim 1, wherein the content of the organic solvent is 0 to 15% by mass based on 100% by mass of the aqueous paint composition.

4. The aqueous paint composition according to claim 1, wherein the film-forming resin comprises at least one selected from the group consisting of acrylic resins, urethane resins, and polyester resins.

5. The aqueous paint composition according to claim 1, wherein the curing agent comprises at least one selected from the group consisting of isocyanate-based curing agents, melamine-based curing agents, and carbodiimide-based curing agents.

6. The aqueous paint composition has a steady-state value η1 of 0.10 to 0.90 Pa·s, and is measured at 23°C and a shear rate of 1,000 s. －１ The aqueous paint composition according to claim 1, wherein the steady-state viscosity η2 measured in steady-state flow measurement of shear deformation is 0.02 to 0.09 Pa·s.

7. The aqueous paint composition according to claim 1, wherein the non-volatile content (NV) of the aqueous paint composition is 1 to 80% by mass with respect to the total mass of the aqueous paint composition.

8. The aqueous paint composition according to claim 1, which is an aqueous paint composition for liquid film discharge coating, liquid column discharge coating, or liquid droplet discharge coating.

9. The aqueous paint composition according to claim 1, further comprising an alkaline swelling type viscous agent.

10. A coating film using the aqueous coating composition described in claim 1.

11. An article having the coating film described in claim 10.

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