Preparation and Application of Multiple Synergistic Flame Retardant Containing Nitrogen,Silicon and Phosphorus
This article aims to prepare a nitrogen,silicon,and phosphorus multiple synergistic high-efficiency flame retardant and study its application performance.Firstly,allyl substituted melamine was synthesized by melamine powder and allyl bromide.After copolymerizing it with vinyltrimethoxysilane,a nitrogen-silicon containing melamine copolymer was obtained.Using the equal volume impregnation method,a certain mass of Type I ammonium polyphosphate(I-APP)powder is mixed with an equal volume of nitrogen-silicon containing melamine copolymer solution to prepare nitrogen silicon flame retardant copolymer coated I-APP flame retardant(MAPP).Pre mix polypropylene(PP)with a certain mass fraction of I-APP or MAPP flame retardant,and then perform melt blending,extrusion,and granulation in a twin-screw extruder to prepare PP flame retardant composites.Mechanical and vertical combustion tests were conducted on PP flame-retardant composites.The results showed that when MAPP was added up to 20%,it could reach the V-0 flame retardant level,while pure I-APP,even with 30%addition,remained below the V-0 level and had lower mechanical properties.It can be seen that the compatibility of I-APP coated with nitrogen silicon copolymer is better,and the synergistic flame retardant efficiency among nitrogen,silicon,and phosphorus is higher.
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