| 摘要 |
PROBLEM TO BE SOLVED: To provide expandable polystyrenic resin particles for a heat insulating material used under the floor of a house, which exhibit excellent flame retardancy and thermal insulation property without using hexabromocyclododecane, excel in no expansion-shrinkage due to a temperature change (dimensional stability), and can inhibit sick house syndrome, and to provide an underfloor heat insulating material for housing, particularly an underfloor heat insulating material for housing disposed between floor beams or lumber girders in the floor of a building, between pillars or puncheons in a wall, and between balks in the roof.SOLUTION: The expandable polystyrenic resin particles for a heat insulating material used under the floor of a house are provided as follows: polystyrenic resin particles are dispersed in an aqueous suspension, and before or during impregnating a blowing agent, a flame retardant solution prepared by dissolving 40-300 pts.wt. of a 2,2-bis[4-(2,3-dibromoalkoxy)-3,5-dibromophenyl]-propane as a bromine-based flame retardant in 100 pts.wt. of a plasticizer having a solubility parameter (SP) of 8.3-9.4 is fed into the aqueous suspension and the flame retardant is impregnated into the polystyrenic resin particles. |
