| 简介 |
PROBLEM TO BE SOLVED : To provide expandable polystyrenic resin particles into which a flame retardant can be uniformly impregnated and which when expanded, ensure a uniform density distribution of foams, exhibit excellent heat fusing property of the particles to one another in molding, and have excellent flame retardancy, and to provide an earth fill member.
SOLUTION : As for the expandable polystyrenic resin particles used for earth fill, 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.
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