Ink composition for inkjet printed steel plate, inkjet printed steel plate using the same, and method for producing inkjet printed steel plate

1. An ink composition for an inkjet printed steel plate, comprising:

a linear acrylate-based oligomer present in an amount of 11% to 50% by weight, based on an overall weight of an ink composition;

a reactive acrylate-based monomer present in an amount of 19% to 75% by weight, based on the overall weight of the ink composition;

a linear acrylate-based monomer having a silica particle attached thereto, present in an amount of 0.1% to 15% by weight based on the overall weight of the ink composition;

an ultraviolet curable initiator present in an amount of 0.1% to 15% by weight, based on the overall weight of the ink composition;

at least one selected from the group consisting of a dye and a pigment, present in an amount of 0.5% to 10% by weight, based on the overall weight of the ink composition; and

at least one selected from the group consisting of an antioxidant, an antifoaming agent, and a dispersant, present in an amount of 0.1% to 10% by weight, based on the overall weight of the ink composition.

2. The ink composition for the inkjet printed steel plate of claim 1 , wherein the linear acrylate-based oligomer includes at least one selected from the group consisting of a linear epoxy acrylate oligomer and a linear urethane acrylate oligomer.

3. The ink composition for the inkjet printed steel plate of claim 2 , wherein the linear epoxy acrylate oligomer includes at least one selected from the group consisting of a cycloaliphatic epoxy acrylate oligomer, an aliphatic polyglycidyl epoxy acrylate oligomer, and a glycidyl amine epoxy acrylate oligomer.

4. The ink composition for the inkjet printed steel plate of claim 2 , wherein the linear urethane acrylate oligomer includes an aliphatic urethane acrylate oligomer.

5. The ink composition for the inkjet printed steel plate of claim 1 , wherein the reactive acrylate-based monomer includes a branch monomer having a benzene ring or a hyperbranch monomer having no benzene ring.

6. The ink composition for the inkjet printed steel plate of claim 1 , wherein the reactive acrylate-based monomer includes at least one selected from the group consisting of phenoxyethyl(meth)acrylate, bisphenol A diglycidyl ether di(meth)acrylate, and trimethylolpropane triacrylate.

7. The ink composition for the inkjet printed steel plate of claim 1 , wherein the silica particle includes a spherical silica particle having a diameter in a range of 2 nm to 500 nm.

8. The ink composition for the inkjet printed steel plate of claim 1 , wherein the linear acrylate-based monomer includes at least one selected from the group consisting of isobornyl acrylate, isobornyl methacrylate, tetrahydrofuryl acrylate, tripropylene glycol diacrylate, 1,6-hexanediol diacrylate, and pentaerythritol triacrylate.

9. The ink composition for the inkjet printed steel plate of claim 1 , wherein the ultraviolet curable initiator includes at least one selected from the group consisting of 2,2-dimethoxy-2-phenylacetophenone, 1-hydroxycyclohexyl phenyl ketone, 1-(4-isopropylphenyl)-2-hydroxy-2-methylpropane-1-one, 1,1-dimethoxy deoxybenzoin, 3,3′-dimethyl-4-methoxybenzophenone, 1-(4-dodecyl phenyl)-2-hydroxy-2-methylpropan-1-one, 2-methyl-144-(methylthio)phenyl]-2-morpholinopropan-1-one, (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, ethyl(2,4,6-trimethylbenzoyl)phenylphosphinate, bis(acyl)phosphine oxide, methyl benzoylformate, 4-benzoyl-4′-methyl di phenyl sulfide, benzyl dimethyl ketal, fluorenone, fluorene, benzaldehyde, benzophenone, anthraquinone, and xantone.

10. The ink composition for the inkjet printed steel plate of claim 1 , wherein the ink composition has a viscosity in a range of 1 to 50 cps, when measured at 25° C.

11. An inkjet printed steel plate, comprising:

a steel plate; and

an inkjet printed layer formed on one or both surface of the steel plate, the inkjet printed layer comprising: an ink composition of claim 1 .

12. The inkjet printed steel plate of claim 11 , further comprising a transparent coating layer or a transparent film layer formed on the inkjet printed layer.

13. The inkjet printed steel plate of claim 12 , wherein the transparent coating layer includes at least one selected from the group consisting of an ultraviolet curable clear coating layer, a polyester-based resin layer having a molecular weight of 3,000 to 25,000, a fluorine resin coating layer, and an unsaturated polyester-based resin layer having self-cleaning properties.

14. The inkjet printed steel plate of claim 12 , wherein the transparent film layer includes at least one selected from the group consisting of polyester phthalate, polypropylene, polyethylene, and ethyl vinyl acetate.

15. The inkjet printed steel plate of claim 12 , wherein the transparent film layer has a thickness in a range of 10 to 150 μm.

16. The inkjet printed steel plate of claim 11 , further comprising at least one selected from the group consisting of a plating layer, a pretreatment layer, a primer layer, and a color coating layer, disposed between the steel plate and the inkjet printed layer.

17. A method of fabricating an inkjet printed steel plate, comprising:

supplying an ink composition of claim 1 to an inkjet head; and

spraying and printing the ink composition on one or both surfaces of a steel plate, using an inkjet printing process, to form an inkjet printed layer on the steel plate.

18. The method of claim 17 , further comprising:

curing the sprayed or printed ink composition with ultraviolet (UV) irradiation.