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膨胀石墨阻燃2370_ftp.pdf

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Macromolecular Chemistry and Physics Full Paper Residue Stabilization in the Fire Retardancy of Wood–Plastic Composites: Combination of Ammonium Polyphosphate, Expandable Graphite, and Red Phosphorus Henrik Seefeldt, Ulrike Braun,* Manfred H. Wagner Combinations of different common ﬂ ame retardants in wood–plastic composites (WPCs) are tested to identify synergistic or antagonistic effects with the goal of improving the ﬁ re per- formance of WPCs. Flame retardants investigated are expandable graphite (EG), ammonium polyphosphate (APP), and red phosphorus (RP) and combinations of two of them are used. The ﬁ re behavior is studied by cone calorimetric measurements. Additional thermogravimetry is used for further investiga- tions. The ﬁ re tests show that EG has the highest potential for ﬂ ame retardancy, but due to its expansion it cracks the formed residue layer. Combinations of EG with RP or with high amounts of APP are able to suppress this cracking. 1. Introduction studied other factors inﬂ uencing burning behavior like geometry and moisture content.[4,5] Wood-plastic composites (WPCs) consist of wood ﬂ our or Three of the most common ﬂ ame retardants for polyole- wood ﬂ akes dispersed in a polymer matrix. Mainly com- ﬁ ns are expandable graphite (EG), ammonium