环状磷腈/聚磷酸铵/三聚氰胺膨胀阻燃环氧树脂研究

本文以DOPO衍生物六(4-DOPO羟甲基苯氧基)环三磷腈(DOPOMPC)、聚磷酸铵(APP)以及三聚氰胺(MEL)形成复配膨胀体系(IFR)阻燃环氧树脂.采用极限氧指数(LOI)、水平、垂直燃烧(UL-94)方法研究了IFR体系对环氧树脂体系阻燃性能影响,通过锥形量热(CONE)研究了体系燃烧特性,通过扫描电子显微镜(SEM)对体系成炭情况进行观察.结果表明,IFR膨胀阻燃体系对环氧树脂具有良好的协同阻燃作用,其中8%DOPOMPC/8%APP/4%MEL(EP3)体系LOI值较纯EP(EP0)提高37.8%;各项燃烧参数也得到了改善,热释放速率峰值(pk-HRR)、有效燃烧热平均值(av-EHC)、比消光面积平均值(av-SEA)及一氧化碳释放速率平均值(av-CO)相对于10%DOPOMPC/10%APP/EP(EP1)分别降低了53.8%、84.4%、57.7%和75.8%;拉伸强度、弯曲强度和冲击强度较EP1分别提高了1.3倍、79.4%和2.5倍;宏观拍摄和扫描电镜结果表明EP3膨胀炭层连续、均匀、致密,阻燃效果良好.

Study of synergistic intumescent flame-retardant epoxy resin based on MEL and DOPO derivatives

Synergistic melamine ( MEL ) , hexalis?( 4?DOPO?methanolphen?oxy )?cyclotriphosphazene ( DOPOMPC) and polyphosphate ( APP ) were added to Epoxy resin ( EP ) to form an intumescent flame retardant system ( IFR ) . The flame retardancy of epoxy resin that was added with different MEL additive amount was measured by UL?94 vertical/horizontal burning test and limited oxygen index( LOI) test. Thermal stability and mechanical properties of epoxy resin were also investigated by TGA and CONE. The flame retardant mechanism of epoxy resin was investigated by SEM. Results showed that proper addition of MEL played a role of synergis. The limited oxygen index value could decline 37. 8% for the sample EP3 ( 8%DOPOMPC/8%APP/4%MEL) . The cone experimental results showed that the peak value heat release rate, average value effective heat of combustion, the average value specific extinction area and the average value carbon monoxideof the EP3 were respectively reduced 53.8%、84.4%、57.7% and 75.8% compared to those of EP1 ( 10%DOPOMPC/10%APP/EP ) . And the tensile strength, flexural strength and impact strength wereincreased by 1.3 times, 79.4% and 2.5 times compared to EP1;The observation of the macro and micro morphology showed that the carbon layer of EP3 was consecutive,even and dense.