Ultraviolet curing urethane acrylate and preparation method thereof

The invention relates to ultraviolet curing urethane acrylate and a preparation method thereof. The preparation method comprises the following steps: carrying out a reaction I between diisocyanate and a modifying agent to obtain modified diisocyanate; carrying out a reaction II between modified diisocyanate and divalent alcohol to obtain a first reaction solution; adding polyhydroxy carboxylic acid and a catalyst in the first reaction solution for a reaction III to obtain a second reaction solution; adding 2-ethyl-1,3-hexanediol into the second section solution for a reaction IV to obtain a third reaction solution; adding hydroxyl acrylate and a polymerization inhibitor into the third reaction solution for a reaction V to obtain a fourth reaction solution; adding triethylamine into the fourth reaction solution for a reaction VI to obtain a urethane acrylate prepolymer; adding deionized water into the urethane acrylate prepolymer to prepare ultraviolet curing urethane acrylate. Ultraviolet curing urethane acrylate prepared according to the preparation method is the novel urethane acrylate.