论文部分内容阅读
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。
Multiwalled carbon nanotubes (MWNTs) were added to melamine formaldehyde resin coated ammonium polyphosphate (APPM) and pentaerythritol (PER) intumescent flame retardant polypropylene (PP) systems using oxygen index (OI), thermal analysis TGA, SEM and CONE were used to test the effect of MWNTs on the flame retardancy of PP intumescent flame retardant system. The mechanism of action was also discussed. The results showed that MWNTs could increase the oxygen index of the system under the proper amount of addition. TG results show that the addition of MWNTs can improve the thermal stability of expanded carbon layer at high temperature and increase the amount of residue at high temperature. SEM images of expanded carbon layer show that MWNTs can improve the morphology of expanded carbon layer and improve the carbon layer Thermal insulation properties. The 0.5% MWNTs compound was used in the intumescent flame retardant system. The oxygen index of the sample reached 32.5% with the flame retardant added at 25% and the sample (3.2 mm) passed UL 94 V-0. Addition of 5% MWNTs can increase the conductivity of PP composites from 1 × 10-17 S / cm to 4.4 × 10-4 S / cm.