三聚氰胺亚锡磷酸盐玻璃协效二乙基次膦酸铝阻燃尼龙6

Flame-Retarded Nylon 6 by the Synergy of Melamine Stannous Phosphate Glass with Aluminum Diethylphosphinate

以摩尔比为50:50的氧化亚锡和五氧化二磷为原料,在500℃下熔融制备亚锡磷酸盐玻璃,再与三聚氰胺通过离子键结合形成三聚氰胺亚锡磷酸盐玻璃(MEPglass).将MEPglass与二乙基次膦酸铝(AlPi)用于尼龙6(PA6)的无卤阻燃,0.5%MEPglass和9%AlPi复配可使PA6达到UL-94V-0@3.2mm阻燃等级,比单独AlPi阻燃时13%的添加量下降了26.9%,而拉伸强度比单独AlPi阻燃体系提高8.5%,熔体流动速率提高13.3%.锥形量热、热重-红外联用、热重分析以及残炭的扫描电镜和X射线能谱分析等表明,MEPglass与AlPi在气相和凝聚相对PA6均存在较强的阻燃协效作用.

Stannous phosphate glass was prepared by melting stannous oxide and phosphorus pentoxide at a molar ratio of 50 : 50 at 500 ℃,which was then combined with melamine by ionic bond to form melamine stannous phosphate glass(MEPglass).Finally,MEPglass and aluminum diethylphosphinate(AlPi)were employed to obtain halogen-free flame-retardancy of PA6.It is found that 0.5% MEPglass and 9% AlPi can induce PA6 to reach UL- 94 V- 0@3.2 mm rating,with a total relative addition reduction of 26.9%,as compared with the addition(13%)of single AlPi,while the tensile strength improves by 8.5% and the melt flow rate increases by 13.3%.Moreover,the results obtained from the cone calorimeter,thermogravimetry-infrared spectroscopy and thermogravimetric analysis of the samples,and scanning electron microscopy and X-ray energy spectrum analysis of carbon re- sidue indicate that there is strong flame-retardant synergy of MEPglass and AlPi on PA6 in both the gas phase and the condensed phase.