▎ 摘　　要

NOVELTY - The method for preparing low thermal conductivity refractory graphene polystyrene sheet, involves adding graphene to styrene, adding flame retardant, additive flame retardant, activated calcium carbonate and polyvinyl alcohol, preparing graphene and styrene slurry intermediate, adding deionized water and dispersant to obtain graphene slurry, adding graphene and styrene slurry intermediate, adding nucleating agent and initiator, adding particle size adjusting agent, adding dispersant and foaming agent, heating, cooling, drying and coating to obtain final product. USE - Method for preparing low thermal conductivity refractory graphene polystyrene sheet. ADVANTAGE - The method enables preparation of low thermal conductivity refractory graphene polystyrene sheet with excellent thermal insulation effect and excellent flame retardant performance. DETAILED DESCRIPTION - Method for preparing low thermal conductivity refractory graphene polystyrene sheet, involves (A) adding graphene to styrene, stirring and blending, adding flame retardant, additive flame retardant, activated calcium carbonate and polyvinyl alcohol, grinding to a fineness of 0.05-15 mu m, preparing graphene and styrene slurry intermediates, (B) adding deionized water and dispersant to reaction vessel for 15-45 minutes to obtain graphene slurry, adding graphene and styrene slurry intermediate, heating at 45-60 degrees C at the rate of 0.5-2.0 degrees C/minute, adding nucleating agent and initiator, continuously stirring, heating at 88-92 degrees C for 7-9 hours, adding particle size adjusting agent to adjust the particle size, (C) continuously adding dispersant and foaming agent, heating at 118.5-123 degrees C at the rate of 0.3-0.8 degrees C/minute, maintaining the reaction at 0.7-0.9 MPa for 3-6 hours, (D) cooling to 40-45 degrees C to prepare graphene polystyrene beads, (E) washing, screening, drying and coating to obtain final product. The quality of graphene with flame retardant and styrene is respectively 0.1-1.0 wt.%, 0.5-0.8 wt.% and 0.3-0.5 wt.%. The quality of activated calcium carbonate and polyvinyl alcohol with graphene is respectively 0.01-0.2 wt.% and 0.001-0.1 wt.%. The quality of deionized water, dispersant, nucleating agent, initiator and styrene is respectively 100-300 wt.%, 0.1-1.5 wt.%, 0.1-0.3 wt.% and 0.3-1.0 wt.%. The quality of dispersant and foaming agent with styrene is respectively 0.02-0.2 wt.% and 8-12 wt.%.