▎ 摘　　要

NOVELTY - Graphene/epoxy acrylic composite resin, is claimed. Preparation of the resin comprises taking graphite as raw material, preparing graphite oxide using an oxidizing agent through Hummers method, stripping and preparing graphene oxide using ultrasonic wave, surface modifying graphene oxide using a silane coupling agent to obtain modified graphene, reducing using a reducing agent to obtain reduced modified graphene, and performing in-situ polymerization with acrylic monomer. USE - The composite resin is useful in graphite/epoxy acrylic-based polyurethane in-mold decoration ink (claimed). ADVANTAGE - The ink does not change color at 300 degrees for 4 minutes, has good flexibility, impact resistance property, adhesive property and water, acid and alkali resistance performance, and satisfies the requirements of IMD product. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing the graphene/epoxy acrylic composite resin, comprising (i) adding 50-200 pts. wt. acid into a three-necked flask, placing in ice bath, adding 1-2 pts. wt. sodium nitrite and 2-3 pts. wt. crystalline flake graphite, stirring uniformly, adding 7-8 pts. wt. oxidizing agent, mixing and reacting at less than 10 degrees C for 2 hours, heating to 35 plus minus 2 degrees C and reacting for 30 minutes, dropping deionized water, heating to 98 degrees C and reacting 30 minutes, diluting with 350 pts. wt. hot water, adding 5-10 pts. wt. of 30% hydrogen peroxide solution so that color turns from brown to bright yellow, filtering, washing using 500-750 pts. wt. dilute hydrochloric acid, removing metal ion and acid radical ion, adding washed graphite oxide into a dialysis bag, adding deionized water, dialyzing to neutral, placing in a vacuum drying chamber and drying at 70 degrees C to obtain graphite oxide powder, (ii) stripping and preparing graphene oxide using ultrasonic wave, taking 0.2-0.8 pts. wt. graphene oxide powder, adding 2-10 pts. wt. water and 50-200 pts. wt. solvent, and ultrasonically dispersing to obtain graphene oxide dispersion, (iii) taking 0.2-0.8 pts. wt. graphene oxide powder, adding 2-6 pts. wt. water and 100 pts. wt. solvent, ultrasonic dispersing to obtain graphene oxide dispersion liquid, adjusting pH of graphene oxide dispersion liquid to 3-5 using acetic acid or hydrochloric acid, adding 10-40 pts. wt. modifying agent, adding the graphene oxide dispersion liquid into a flask and stirring at 50 degrees C to obtain 80-140 pts. wt. of the graphene oxide dispersion liquid, adding ethyl alcohol, extracting for multiple times to remove unreacted modifying agent, vacuum drying the modified graphene oxide and ultrasonically dispersing to obtain modified graphene oxide dispersion liquid, (iv) taking 123.4 pts. wt. modified graphene oxide dispersion liquid, adding 160 pts. wt. water, ultrasonic processing for 30 minutes, adding 0.5-2 pts. wt. reducing agent and 20 pts. wt. water, ultrasonic processing for 30 minutes, transferring to a three-necked flask, stirring at 95 degrees C, washing using water for 3 times, filtering to remove unreacted salt, washing using dimethylformamide and ultrasonically dispersing in 52 pts. wt. solvent to obtain reduced-modified graphene oxide dispersion liquid, and (v) adding mixed monomer into reduced-modified graphene oxide dispersion liquid, adding an initiator and reacting at 80 degrees C; (2) graphite/epoxy acrylic-based polyurethane in-mold decoration (IMD) ink, comprising 20-30 wt.% graphene/epoxy acrylic composite resin, 3-5 wt.% curing agent, 1-2 wt.% drying agent, 0.5-1 wt.% adhesion promoter, 5-10 wt.% pigment, 0.5-1 wt.% wetting dispersant, 0.1-0.2 wt.% flatting agent, 0.1-0.2 wt.% antifoaming agent and solvent (remaining amount); and (3) preparing the graphite/epoxy acrylic-based polyurethane IMD ink, comprising mixing pigment, graphene/epoxy acrylic composite resin, wetting dispersing agent and solvent, grinding and dispersing to form paste, adding fast drying, adhesion promoter, flatting agent, antifoaming agent and curing agent, mixing and stirring uniformly.