▎ 摘　　要

NOVELTY - Production method of graphite-based thermal insulation material comprises using graphene dispersion, polyether polyol, flame-retardant polyether polyol, composite catalyst, silicone oil, dimethyl methyl phosphonate, dichlorofluoroethane, isocyanate and polymethylene polyphenylene isocyanate, and comprises (S1) weighing polyether polyol and flame-retardant polyether polyol and putting into a mechanical stirring device for stirring and mixing, (S2) adding isocyanate, graphene dispersion, composite catalyst, silicone oil, dimethyl methylphosphonate and dichlorofluoroethane to the polyol mixture and pre-mixing with the mechanical stirring device to obtain a composite material, (S3) controlling a material temperature of the composite material, quickly adding polymethylene polyphenylene isocyanate to the composite material and stirring and (S4) pouring the mixed composite material into a mold for foaming, opening the mold to take out foam product and removing surface crust layer. USE - The method is used for producing a graphite-based thermal insulation material. ADVANTAGE - The method adopts graphene as a halogen-free flame-retardant, linearly increases the oxygen index of rigid polyurethane foam, ensures the thermal insulation of rigid polyurethane foam, and reduces the environmental pollution, where when the rigid polyurethane foam is burning, the synergistic flame-retardant effect of dimethyl methylphosphonate and graphene improves the flame-retardant effect of rigid polyurethane foam. DETAILED DESCRIPTION - Production method of graphite-based thermal insulation material comprises using 20-30 pts. wt. graphene dispersion, 15-25 pts. wt. polyether polyol, 15-17 pts. wt. flame-retardant polyether polyol, 5-7 pts. wt. composite catalyst, 1-3 pts. wt. silicone oil, 5-7 pts. wt. dimethyl methyl phosphonate, 10-16 pts. wt. dichlorofluoroethane, 15-25 pts. wt. isocyanate and 5-15 pts. wt. polymethylene polyphenylene isocyanate, and comprises (S1) weighing polyether polyol and flame-retardant polyether polyol and putting into a mechanical stirring device for stirring and mixing, (S2) adding isocyanate, graphene dispersion, composite catalyst, silicone oil, dimethyl methylphosphonate and dichlorofluoroethane to the polyol mixture and pre-mixing with the mechanical stirring device to obtain a composite material, (S3) controlling a material temperature of the composite material, quickly adding polymethylene polyphenylene isocyanate to the composite material and stirring at 2900 rpm for 10 seconds and (S4) pouring the mixed composite material into a mold for foaming, after the foam is matured for 4 hours, opening the mold to take out the foam product and removing the surface crust layer to obtain the required rigid polyurethane foam.