▎ 摘　　要

NOVELTY - Preparation of thermochromic fluorescent oil hydrogel involves providing first fluorescent monomer, second fluorescent monomer and composite hydrogel, where first fluorescent monomer includes N-(4-(1,2,2-triphenylvinyl)phenyl)acrylamide, drying the composite hydrogel to obtain a composite xerogel, dissolving first fluorescent monomer, second fluorescent monomer, oil-gel monomer, oil-based photoinitiator and oil-based crosslinking agent in pre-polymerization solvent, contacting composite xerogel with formed oil-gel pre-polymerization liquid and performing first swelling on composite xerogel to obtain oil-hydrogel precursor, causing oil-gel monomer in oil-hydrogel precursor to undergo gel polymerization, and contacting obtained color-changing gel precursor with water to carry out second swelling and contacting color-changing gel precursor with coordination solution containing trivalent europium ion, to coordinate trivalent europium ions with second fluorescent monomer. USE - Preparation of thermochromic fluorescent oil hydrogel used in storage of information (claimed). ADVANTAGE - The thermochromic fluorescent oil hydrogel has remarkable fluorescence color transition with temperature, provides remote light control performance, can write cyclic information, has simple information loading process and strong operability. DETAILED DESCRIPTION - Preparation of thermochromic fluorescent oil hydrogel involves providing a first fluorescent monomer, second fluorescent monomer and composite hydrogel with low critical transition temperature, where the composite hydrogel comprises reduced graphene oxide, the first fluorescent monomer includes N-(4-(1,2,2-triphenylvinyl)phenyl)acrylamide, and the second fluorescent monomer includes a fluorescent ligand compound capable of coordinating with trivalent europium ion, drying the composite hydrogel to obtain a composite xerogel, dissolving the first fluorescent monomer, second fluorescent monomer, oil-gel monomer, oil-based photoinitiator and oil-based crosslinking agent together in pre-polymerization solvent to form an oil-gel pre-polymerization liquid, contacting the composite xerogel with the oil-gel pre-polymerization liquid and performing first swelling treatment on the composite xerogel to achieve swelling equilibrium to obtain an oil-hydrogel precursor, causing the oil-gel monomer in oil-hydrogel precursor to undergo gel polymerization to obtain color-changing gel precursor, and contacting the color-changing gel precursor with water to carry out second swelling treatment and contacting the color-changing gel precursor with a coordination solution containing trivalent europium ion, to coordinate trivalent europium ions with second fluorescent monomer to form a fluorescent substance. An INDEPENDENT CLAIM is included for thermochromic fluorescent oil hydrogel, in which thermochromic transition time is within 200 seconds, and time for heating up to phase transition temperature under infrared light is within 180 seconds.