多壁碳纳米管对聚丙烯膨胀阻燃体系阻燃性能的影响

The Effect of Multi-wall Carbon Nanotube on Intumescent Flame Retardant PP Systems

将多壁碳纳米管(MWNTs)添加到三聚氰胺甲醛树脂包覆的聚磷酸铵(APPM)和季戊四醇(PER)膨胀型阻燃聚丙烯(PP)体系中,采用氧指数(OI)、热分析(TGA)、扫描电镜(SEM)和锥形量热仪(CONE)对材料进行测试,考察MWNTs对PP膨胀阻燃体系阻燃性能的影响,探讨其作用机理。结果表明:MWNTs在适量的添加量下可以提高体系的氧指数。TG结果表明:MWNTs的加入可以提高膨胀炭层在高温时的热稳定性,增加高温时残余物的量;膨胀炭层的SEM照片表明:MWNTs可以改善膨胀炭层的形貌,提高炭层的隔热隔质性能。0.5%的MWNTs复配用于膨胀阻燃体系中,可以在阻燃剂添加25%下,样品氧指数达到32.5%,样品(3.2 mm)通过UL 94 V-0级。加入5%的MWNTs同时可以将PP复合材料的电导率从1×10-17S/cm提高到4.4×10-4S/cm。

The multi-walled carbon nanotubes （MWNTs） in different amounts were added into the polypropylene （PP）/ ammonium polyphosphate coated by melamine-formaldehyde resin （ APPM ）/pentaerythritol （PER） to study their enhancing effects on the intumescent flame retardance （IFR）. The flame retardance of the PP/IFR composite was tested by the oxygen index （OI）,TG,SEM and CONE were used to study the effect of MWNTs on PP/APPM/PER flame retardant system. The results showed that MWNTs could increase the OI of PP/APPM/PER composites. TG results showed that MWNTs inhibited degradation of the PP/APPM/PER at high temperatures and increased the charring. SEM pictures showed that the addition of MWNTs could enhance the structure of the char of the PP/APPM/PER. Adding 0.5 % MWNTs into the PP/APPM/PER flame retardant system,the value of OI could reach 32.5 % with 25 % flame retardant and could reach the UL 94 V-0. The electrical conductivity of PP composite could be improved from 1×10-17 S/cm to 4.4 × 10-4 S/cm by adding 5 % MWNTs.