Method of producing expandable polystyrene beads which have...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/18 (2006.01) B29B 9/00 (2006.01) C08K 3/04 (2006.01) C08L 25/02 (2006.01)

Patent

CA 2639270

An expandable polystyrene bead production method, which is a two-step process, is disclosed. The method includes obtaining suspendable, homogenous micropellets from a mixed composition prepared by mixing graphite particles with a styrene-based resin and extruding the composition, and carrying out seed polymerization by suspending graphite--containing micropellets in water and adding a styrene-based monomer and an aromatic hydrocarbon having 6 to 10 carbon atoms, and impregnation by adding a blowing agent. The produced expandable polystyrene beads, which contain graphite particles, are considerably low in thermal conductivity. In addition, the expandable polystyrene beads exhibit a little change in the thermal conductivity over time due to the use of the graphite particles, so that the heat insulation property can be sustained for an extended period of time.

L'invention porte sur un procédé de fabrication de perles de polystyrène expansible, qui est un procédé à deux étapes. Le procédé comprend les opérations consistant à obtenir des micropastilles homogènes, pouvant être mises en suspension, à partir d'une composition mixte préparée par mélange de particules de graphite avec une résine à base de styrène et extrusion de la composition, et à conduire une polymérisation d'ensemencement par mise en suspension des micropastilles contenant du graphite dans l'eau et addition d'un monomère à base de styrène et d'un hydrocarbure aromatique ayant 6 à 10 atomes de carbone, et imprégnation par addition d'un agent gonflant. Les perles de polystyrène expansible qui sont obtenues, qui contiennent des particules de graphite, ont une conductivité thermique extrêmement faible. De plus, les perles de polystyrène expansible présentent un faible changement dans la conductivité thermique au cours du temps en raison de l'utilisation des particules de graphite, de telle sorte que la propriété d'isolation thermique peut être entretenue pendant une période de temps prolongée.

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