▎ 摘　　要

NOVELTY - Graphene composite bio-based polyether polyol prepared by using bio-based high-functionality initiator and bio-based low-functionality initiator as the composite initiator for polymerizing with propylene oxide to obtain intermediate polyether polyol, then reacting the graphene with intermediate polyether polyol, and polymerizing with epoxy alkane to obtain target product, where the graphene-composite bio-based polyether polyol has a hydroxy value of 45-70 mgKOH/g, functionality of 2.5-3.5, molecular weight of 2500-3000, and a viscosity of 1500-3000 mPa.second at 25 degrees C, is claimed. USE - Used as the graphene composite bio-based polyether polyol. ADVANTAGE - The polyol: can reduce dependence on non-renewable resources; has no uneven mixing and delamination during application; greatly improve the mechanical properties, e.g. hardness and strength of the polyurethane foam; and is biodegradable. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing graphene composite bio-based polyether polyol comprising (a) adding composite initiator and catalyst to pressure-resistant reactor, mixing, then replacing with nitrogen to prepare oxygen content in the reactor less than 50 ppm, dehydrating at 100-120 degrees C under a vacuum of -0.09 to -0.093 MPa for 1-3 hours, adding first part of propylene oxide for initial polymerization reaction, continuing internal pressure reaction for 1-1.5 hours, and vacuuming for 0.5-1 hour for removing the unreacted propylene oxide monomer and small molecule by-products to obtain intermediate polyether polyol, (b) dispersing graphene powder ultrasonically in dehydrated dimethylacetamide for 1-3 hours, adding to intermediate polyether polyol, reacting at 90-110 degrees C for 3-5 hours, repeatedly washing, suction filtering with acetone for 3-5 times, degassing the mixture, drying for 2-3 hours while stirring at 80-90 degrees C to obtain intermediate polyether polyol which is chemically bonded to graphene, (c) heating the intermediate polyether polyol chemically bonded to graphene at 110-125 degrees C, adding ethylene oxide and second part of propylene oxide for carrying out second polymerization reaction, continuing internal pressure reaction for 0.5-1 hours, vacuuming for 0.5-1 hour for removing unreacted propylene oxide, ethylene oxide monomer and other by-products to obtain graphene composite polyether polyol crude polymer, and (d) cooling the graphene composite polyether polyol crude polymer to 80-100 degrees C, adding bio-organic acid for neutralization reaction, then adding adsorbent for adsorption, heating at 110-130 degrees C for drying and filtering to obtain target polyether polyol.