APP-DAP-CS 膨胀阻燃体系阻燃聚甲醛研究

为提高聚甲醛（POM）的阻燃性能，以聚磷酸铵（APP）-磷酸氢二铵（DAP）-玉米淀粉（CS）为膨胀阻燃体系，将其与POM 通过熔融共混制备了阻燃POM 复合材料。并采用氧指数（LOI）仪、水平垂直燃烧（UL-94）测定仪、热重-差示扫描量热仪（TG-DSC）、扫描电镜（SEM）及锥形量热仪（CONE）等仪器对所制备的样品进行了测试与表征，结果表明：当复配膨胀体系中APP ∶ DAP ∶ CS=4 ∶ 3 ∶ 1 时，阻燃POM 的LOI 可达38，UL-94 等级为V-1 级，热释放速率和总释热量均较小，炭层结构致密稳定，说明APP-DAP-CS 膨胀阻燃体系能够有效抑制POM的燃烧，具有良好的阻燃作用。

Study of APP-DAP-CS intumescent flame retardant applied on polyoxymethylene

In order to improve the flame retardancy of polyoxymethylene (POM), the flame retardant POM composites were prepared by melt blending ammonium polyphosphate (APP) - diammonium hydrogen phosphate (DAP)-corn starch (CS) with POM. The samples were tested and characterized by limiting oxygen index (LOI), horizontal vertical combustion (UL-94), thermogravimetry differential scanning calorimetry (TG-DSC), scanning electron microscopy (SEM) and cone calorimeter (CONE). The results show that the LOI of flame retardant POM can reach 38 when APP: DAP: CS = 4:3:1, UL-94 grade is V-1.The heat release rate and total heat release are relatively small.The structure of carbon layer is compact and stable, which indicates that APP-DAP-CS intumescent flame retardant system can effectively inhibit the combustion of POM and has a good flame retardant effect.