▎ 摘　　要

NOVELTY - Composite foam bead comprises polyurethane coated with graphene-containing aqueous polyurethane solution comprising comprises aqueous polyurethane, graphene aqueous slurry, aqueous antioxidant, crosslinking agents and deionized water to form an aqueous polyurethane antistatic coating. The foaming ratio of polypropylene foamed beads is 8-45 times. The surface of polypropylene foamed beads is cleaned and degreased by ultrasonic waves and plasma is activated at low temperature. USE - Composite foamed bead for molded component (claimed). ADVANTAGE - The composite foam bead has excellent antistatic effect and has specific gravity of 23-130 kg/m3. The graphene distribution on the surface of the polypropylene composite foamed beads is more uniform. The preparation process is environmentally-friendly. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) preparation composite foam bead, which involves ultrasonically cleaning the surface of polypropylene foam beads, drying at 50-100 degrees C, carrying out low-temperature plasma treatment process to treat the surface of the foam beads, improving the bonding strength between the surface of polypropylene foam beads and aqueous polyurethane coating, mixing aqueous polyurethane, graphene slurry, aqueous antioxidant, crosslinking agent and deionized water uniformly, ultrasonically dispersing to obtain graphene-containing aqueous polyurethane solution, adding the polypropylene foamed beads to the rotary drum of the spray drying device, heating and drying the materials with hot air, drying pre-heated polypropylene foam beads at 80-105 degrees C, stirring and dispersing assist polypropylene foam beads, spraying surface of the polypropylene foamed beads with a atomizing spray gun with an outlet located in the drum connected to a liquid tank outside the drum through a pipe, on the surface of the graphene-containing aqueous polyurethane spray solution, spraying with a graphene-containing aqueous polyurethane spray solution, continuing to heat and dry, stop spraying until the aqueous polyurethane solution is completely consumed, forming a uniform coating on the surface of the polypropylene foam beads and drying until the surface coating of polypropylene foam beads is dried; and (2) molded component of composite foam, which has surface resistivity of 108-1010 Omega .