Abstract:

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 ethylene⁃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 indicated 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 compatibility between the flame⁃retardant additives and polymer matrix was improved. Consequently， the mechanical properties of the resultant flame⁃retardant EVA composites were well maintained.

Key words: ethylene vinyl acetate, nickel?containing metal?organic framework materials, synergistic flame retardant