阻燃棉纤维的热降解研究

用四羟甲基氯化膦及一些协效剂对棉纤维进行阻燃处理,并用热分析、氧指数及剩炭率等手段对阻燃样品的热解过程及阻燃机理进行了研究.实验表明,经过阻燃处理的样品比未处理的热解起始温度提前,第一阶段热解活化能降低,氧指数和剩炭率升高;不同协效剂得到的阻燃样品,其阻燃性能不同,用尿素和磷酸二氢铵作为协效剂得到的样品阻燃性能分别优于硫脲和六亚甲基四胺.

Study on the Thermal Degradation of Cotton Cellulose Treated with Flame Retardants

The thermal degradation of cotton cellulose treated with flame retardants containing tetrakis(hydroxymethyl)phosphonium chloride and some synergistic reagents was studied by thermal analysis,limiting oxygen index(LOI) and char yield.The thermal degradation process and flame retardant mechanism were also discussed.Our experiments demonstrated the following facts.The temperature of the thermal degradation onset point and the activation energy of the first thermal degradation stage were lower for cotton cellulose treated with flame retardants than those of untreated sample.There was an increase in char yield and LOI for flame retarded samples compared with pure cotton sample.The flame retardance of the samples treated with urea and diammonium hydrogen phosphate were better than those treated with thiourea and hexamethylenamine,respectively.