Performance of synergistic intumescent flame-retardant EVA with MOF-74
A nickel-containing metal-organic framework material(MOF-74),piperazine pyrophosphate(PPAP),and a triazine charring foaming agent(CFA)were homogeneously mixed at a certain mass ratio and then incorporated into eth-ylene-vinyl-acetate resin(EVA).The performance of the resultant EVA composites was characterized.When 19 wt％PPAP/CFA(IFR)was introduced with a mass ratio of 3:1,the EVA composites obtain a UL 94 V-0 classification in the vertical burning tests as well as a limiting oxygen index(LOI)of 26.9％.IFR was mixed with MOF-74 at a mass ratio of 97:3,and then the resultant mixture was introduced into EVA,the resulting composites achieved a UL 94 V-0 classification along with an LOI of 27.1％at a IFR/MOF-74 loading of 18％.The cone calorimetry test results indicat-ed that the addition of MOF-74 effectively inhibited the release of heat,smoke and carbon monoxide during combustion.It was demonstrated that MOF-74 generated an excellent synergistic flame-retardant effect.Meanwhile,the compatibili-ty between the flame-retardant additives and polymer matrix was improved.Consequently,the mechanical properties of the resultant flame-retardant EVA composites were well maintained.
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