▎ 摘　　要

NOVELTY - An environmentally-friendly blue digital printing ink comprises 5-20 wt.% plant dye, 5-12 wt.% viscosity modifier, 2-5 wt.% surfactant, 0.5-2 wt.% pH regulator, 0.2-0.5 wt.% preservative, 0.2-0.5 wt.% dispersant, 0.05-0.08 wt.% graphene and balance amount of deionized water. USE - Environmentally-friendly blue digital printing ink is useful for fabric. ADVANTAGE - The blue digital printing ink is environmentally friendly, does not contain synthetic dyes, and can be prepared in an economical manner with excellent dyeing effect. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation method of environmentally-friendly blue digital printing ink.