▎ 摘　　要

NOVELTY - High-barrier heat-resistant solvent-free polyurethane composite material, comprises A component and B component, where the molar ratio of isocyanate and hydroxy functional groups in A component and B component is (1.1:1)-(2:1). The A component is polyurethane prepolymer prepared by 30-50 wt.% graphene-modified polyester polyol and 50-70 wt.% isocyanate. The B component comprises 30-60 wt.% graphene modified polyol, 20-50 wt.% polyester polyol, 5-20 wt.% nano-silicon dioxide modified polyether polyol, 5-20 wt.% isocyanate, 2-10 wt.% small molecular polyol, 0.3-5 wt.% coupling agent and 0.05-1 wt.% catalyst A. USE - The high-barrier heat-resistant solvent-free polyurethane composite material is useful as film lamination in packaging composite field of daily chemical, food, cigarette and medicine. ADVANTAGE - The high-barrier heat-resistant solvent-free polyurethane composite material has outstanding barrier property, water boiling resistance and cooking resistance, and has high bonding strength, does not contain solvent, is safe and environment-friendly, and can enhance the medium-resistant ability and composite strength of the composite film. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the high-barrier heat-resistant solvent-free polyurethane composite material, comprising: preparing graphene-modified polyester polyol by oxidizing graphite powder by Hummers method to obtain graphene oxide, ultrasonically dispersing the obtained graphene oxide in small molecular polyol, ultrasonically dispersing for 5-10 minutes, uniformly dispersing graphene oxide to obtain graphene oxide alcohol dispersion liquid, performing esterification and polycondensation reaction of graphene oxide alcohol dispersion liquid and small molecular dibasic acid to obtain graphene modified polyester polyol; preparing nano-silicon dioxide modified polyether polyol by adding nano-silicon dioxide and polyether polyol into a high-speed dispersion machine, respectively dispersing for 5-10 minutes under the rotating speed of 1000 revolutions/minute and 2000 revolutions/minute until uniformly dispersed, and stopping dispersion to obtain nano-silicon dioxide modified polyether polyol; preparing A component by adding 20-50 wt.% of the prepared graphene-modified polyester polyol, vacuum dehydrating for 1-2 hours at 110-120℃, reacting with 25-60% isocyanate at 50-60℃ for 1 hour, then heating to 80-90℃ for 3 hours to obtain the product as A component; preparing B component by vacuum dehydrating 30-60 wt.% prepared graphene modified polyol, 20-50 wt.% polyester polyol, 5-20 wt.% nano-silicon dioxide modified polyether polyol for 1-2 hours at 110-120℃, reacting with 5-20 wt.% isocyanate at 50-60℃ for 1 hours then heating to 80-90℃ for 3 hours, adding 2-10 wt.% small molecular polyol, 0.3-5 wt.% coupling agent and 0.05-1 wt.% catalyst to obtain product as B component; and mixing A component an B component, where the molar ratio of isocyanate and hydroxy functional groups is (1.1:1)-(2:1) to obtain the high barrier heat-resistant solvent-free polyurethane composite material.