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Study on Intumescent PEPA/MP Flame Retardant on PP

Fan Xiang-cui

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Abstract

As a charring agent,1-oxo-4-hydroxymethyl-2,6,7-trioxa-1-phosphabicycloocantane(PEPA)was mixed in a certain proportion with monomelamine phosphate(MP)and synergist,which composed to be intumescent flame retardant(IFR),and IFR-PP was prepared.The effect of IFR content on the flammability performance and mechanical properties of PP was discussed.With 23%loading of IFR,PP had a LOI of 26.3%,and met the UL-94 V-0 rating.Compared to PP,the tensile and impact strength of IFR-PP decreased,flexural strength increased.The thermal and charring behaviors were investigated by DSC,TG and SEM.The results showed that with the increasing of the flame retardant loading,degree of crystallinity of PP increased,decomposition rate decreased,char residues enhanced.Intumescent char layers of IFR-PP after burned had a porous interior and compact exterior structure.

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What this paper is about

As a charring agent,1-oxo-4-hydroxymethyl-2,6,7-trioxa-1-phosphabicycloocantane(PEPA)was mixed in a certain proportion with monomelamine phosphate(MP)and synergist,which composed to be intumescent flame retardant(IFR),and IFR-PP was prepared.The effect of IFR content on the flammability performance and mechanical properties of PP was discussed.With 23%loading of IFR,PP had a LOI of 26.3%,and met the UL-94 V-0 rating.Compared to PP,the tensile and impact strength of IFR-PP decreased,flexural strength increased.The thermal and charring behaviors were investigated by DSC,TG and SEM.The results showed that with the increasing of the flame retardant loading,degree of crystallinity of PP increased,decomposition rate decreased,char residues enhanced.Intumescent char layers of IFR-PP after burned had a porous interior and compact exterior structure.

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Available abstract

As a charring agent,1-oxo-4-hydroxymethyl-2,6,7-trioxa-1-phosphabicycloocantane(PEPA)was mixed in a certain proportion with monomelamine phosphate(MP)and synergist,which composed to be intumescent flame retardant(IFR),and IFR-PP was prepared.The effect of IFR content on the flammability performance and mechanical properties of PP was discussed.With 23%loading of IFR,PP had a LOI of 26.3%,and met the UL-94 V-0 rating.Compared to PP,the tensile and impact strength of IFR-PP decreased,flexural strength increased.The thermal and charring behaviors were investigated by DSC,TG and SEM.The results showed that with the increasing of the flame retardant loading,degree of crystallinity of PP increased,decomposition rate decreased,char residues enhanced.Intumescent char layers of IFR-PP after burned had a porous interior and compact exterior structure.

Key concepts: Intumescent, Fire retardant, Char, Materials science, Charring, Composite material, Flexural strength, Ultimate tensile strength

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