阻燃剂协同复配对热固性酚醛树脂阻燃性能的影响

通过阻燃剂氢氧化镁(MH)、三水氢氧化铝(ATH)、膨胀型阻燃剂(IFR)、硼酸锌(ZB)等以单一或协同复配的形式对酚醛树脂体系阻燃性能的影响进行了研究。利用差热分析(DTA)对体系的曲线形貌、放热量等热行为进行研究,并对体系的氧指数、垂直燃烧等级及产烟率等燃烧性能进行了测定。结果表明,燃烧放出热量最小的体系为MH/ATH/IFR/ZB/PF,较纯酚醛树脂体系降低了65%,氧指数最大的体系为MH/ATH/IFR/ZB/PF,数值为93.4,较纯酚醛树脂体系的氧指数43.6提高了1.2倍。添加阻燃剂后,体系的垂直燃烧等级由UL94V-1级均提高至UL94V-0级,产烟率最低的体系为MH/ATH/PF,数值为72%。

Effect of Synergistic compounded Flame-retardants on the Fire Resistance of Thermosetting Phenolic Resin

Fire resistance effect of different flame-retardants such as magnesium hydroxide(MH),alumina trihydrate(ATH),intumescent flame retardants(IFR),zinc borate(ZB) were studied by differential thermal analysis(DTA).Thermal behaviors of the MH/ATH/IFR/ZB/PF system were researched by analyzing the DTA curves and heat release.At the same time,the combustion performance of the system was studied by analyzing the oxygen index,vertical burn test and examinating the rate of smoke.The results indicate that the MH/ATH/IFR/ZB/PF system has the minimum heat release which decreases by 65% comparing with pure phenolic resin.The maximum oxygen index of the MH/ATH/IFR/ZB/PF system was 93.4%,it is 2.2 times of that of pure phenolic resin.The vertical burning levels of the flame retardant systems rise from UL94 V-1 of pure phenolic resin to UL94 V-0.MH and ATH showed better smoke suppression than other flame-retardants,the yield of smoke was 72%.