酸碱处理蒙脱土与磷酸酯阻燃剂复配阻燃PC/ABS合金

Synergistic Flame Retardant of Acid or Alkali-treated Montmrillonite/Phosphate Flame Retardant in PC/ABS Blends

采用酸碱处理法对蒙脱土进行有机化改性,再将酸碱处理的蒙脱土与磷酸酯阻燃剂复配,作为聚碳酸酯/丙烯腈-丁二烯-苯乙烯三元共聚物(PC/ABS)合金的阻燃体系,并表征了酸碱处理蒙脱土对合金的热稳定性和阻燃性能.结果表明,间苯二酚双(二苯基磷酸酯)改性的蒙脱土(BDP-MMT)使阻燃PC/ABS合金的起始分解温度降低,而酸碱处理蒙脱土却使合金的起始分解温度有所提高;BDP-MMT的加入会恶化碳层的阻隔性能,而酸碱处理蒙脱土却可以增加碳层的稳定性,使第二热释放峰值出现的时间延迟,且适合的酸浓度处理蒙脱土可以使合金通过UL-94 V-0级检验.

Acid-treated montmrillonite（a-MMT） and alkali-treated montmrillonite（b-MMT） were prepared by modifying Na-montmorillonite（Na-MMT） with hydrochloric acid or sodium hydroxide,which were used with phosphate to synergistic flame retard polycarbonate/acrylonitrile-butadiene-styrene（PC/ABS） blends.Effects of a-MMT and b-MMT on the flammability property and thermal stability of the blends were investigated by X-ray diffraction（XRD）,thermogravimetry（TG）,microscale combustion calorimeter（MCC）,scanning electron microscope（SEM） and so on.The results show that 1,3-benzenenediol polymer with phosphoric trichloride phenyl ester（BDP） modified montmorillonite（BDP-MMT） decreased the initial decomposition temperature of the flame retardant PC/ABS blends,while a-MMT and b-MMT increased it.The addition of BDP-MMT deteriorated the barrier property of carbon layer.But a-MMT and b-MMT enhanced the thermal stability of carbon layer and delayed the time of second peak of heat release rate（PHRR2）.Moreover,PC/ABS blends flame resisted by montmrillonite treated with proper acid concentration were classified as UL-94 V-0.