- - UV curable resin composition for coil coating and coil coated steel sheet coated with the resin coposition

摘要

The invention coiled-coil coated with a coating the ultraviolet-curable resin composition and the resin composition for use in - that on the coated steel sheet, specifically, the composition based on the total weight, after curing, a tensile strength of 1.5kgf / mm ² or more, elongation at break 15 to 25 parts by weight of a urethane (meth) acrylate oligomer (A) having a proportion of 40% or more; 5 to 15 parts by weight of a urethane (meth) acrylate oligomer (B) having a tensile strength of 2.2 kgf / mm ² or more and a elongation of 10% or more after curing; 10 to 20 parts by weight of a urethane (meth) acrylate oligomer (C) having a hoppler viscosity of 18,000 to 24,000 mPa.s (at a temperature of 25 ° C); 45 to 55 parts by weight of an acrylic acid ester monomer; And 5 to 10 parts by weight of an ultraviolet curing agent; and a coil-coated steel sheet having an upper coating layer formed on at least one side of the steel sheet by the ultraviolet-curing resin composition. The UV-curable resin composition for a coil-coating according to the present invention has excellent physical properties such as elongation and surface hardness, so that even if deep drawing is performed on a steel sheet after coating, problems such as cracking or peeling Does not occur.