Polyurethane resin composition, carboxylic acid group-containing polyurethane (meth)acrylate resin, and method for preparing and use thereof

A polyurethane (meth)acrylate resin containing a carboxylic acid group, which is represented by Formula (III),

• wherein
• R1 is a hydrogen atom or a methyl group;
• R2 is an alkyl group;
• R3 is
• where n1 is a positive number not lower than 1;
• R4 is an alkyl group, an alkenyl group, or an alkyl ether group;
• R5 is
• where T2 is an organic group, T21 is an alkyl group, an alkenyl group, or an alkyl ether group, and T22 is a hydrogen atom or a methyl group;
• and
• X is —CH2—CH2—, —CH2—CH2—O—CH2—CH2—, or
• where each of m and n is independently a positive number not lower than 1.

A method for preparing a polyurethane (meth)acrylate resin containing a carboxylic acid group, comprising subjecting a hydroxyl group of a monohydric alcohol containing a carboxylic acid group and a hydroxyl group of a (meth)acrylate containing the hydroxyl group to a condensation reaction with multiple isocyanate groups of a polyurethane resin containing multiple isocyanate groups, the monohydric alcohol containing the carboxylic acid group being selected from the group consisting of 2-Butenedioic acid, 1-(2-hydroxyethyl) ester, 2-Butenedioic acid, mono(2-hydroxypropyl) ester, 2-Butenedioic acid, mono[2-(2-hydroxyethoxy)ethyl]ester, and combinations thereof, the (meth)acrylate containing the hydroxyl group being selected from the group consisting of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, and combinations thereof, the polyurethane resin containing multiple isocyanate groups being represented by Formula (I),

• wherein
• X1 is an organic group;
• X2 is represented by Formula (II);
• where T1 is an aromatic group, T11 is a hydrogen atom or an isocyanate group, and each of m, n, and t is independently a positive number not lower than 1, and
• wherein
• the organic group is an ethyl group, a propyl group, an allyl group, —C2H4—O—C2H4—, —C3H6—O—C3H6—, or —C4H8—O—C4H8—;
• and
• the aromatic group is a phenyl group,
• where n1 is a positive number not lower than 1.