LIAO Kun-tian;XU Lv-si;LI Jia-tong
. 2013, 44(08): 1195-1199.
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A new kind of flame-resistance heat-insulating foam was synthesized by blending the low density polyethylene (LDPE) with the regeneration polyolefin(RPE)by employing the two-steps foaming method, in which the red phosphorus, halogen-free and flame resistant PE masterbatches were used as the flame retardant agents. The optimum blending ratio and physicochemical properties, such as the mechanical performance, flame retardancy, heat insulation performance, as well as the combustion smoke composition were also investigated. The results indicated that, in addition to reducing the cost, blending RPE could improve the low gel rate of pure LDPE, which would make it much easier to go through second pressured foaming of polyolefin foam and also the improved the capacities of the foam. In addition, The optimum blending ratio of LDPE and RPE was 50%, when performance of the material got the best: the foaming ratio was 32, the oxygen index reached 30,The vertical burning velocity was 13mm/min, the water absorbed rate was 0.0016g/cm3, The thermal conductivity was 0.017W/(m*K). After combustion, the constituents of the smoke was similar with that of the pyrolysis products of polyethylene, which indicated the PE foam material had a poor contact with oxygen in the combustion process and the dioxin and others toxic gases were also not been detected.