Layered Double Hydroxides Unsaturated Hydrocarbon Flame Retardant Materials

Recently，Layered double hydroxide (LDH) as a compelling new multifunctioninorganic flame retardant with non-halogen and non-phosphorous has received more andmore attention．However，the inflaming retarding efficiency of LDH is low and has largepackage in polymer flame retardant material leading to poor mechanical properties，which impact its application in many fields seriously．This paper mainly used Zn2+andAl3+synthesis ZnAl-LDH with good morphology，then introduced single potassiumdodecyl phosphate to modify LDH．We prepare nanocomposite of PP/ZnAl-LDH andPS/ZnAl-LDH，and further discussed synergistic flame retardant mechanism of LDH，intumescent flame resisting system and metal oxide．Combined with characterization of incorporation structure，flame retardant propertyand thermal stability property，we can get the following conclusions：Nanocomposite prepared at substrate of polypropylene (PP)，when adding massfraction of LDH was1%in the same group，PP6a and PP5b had the best flame retardantproperty effect．PP5b had1%ZnO more than PP6a，therefore the ignition time of PP5bwas short relatively but value of PHRR decreased16%．PP5b has a better flameretardation and has a smaller fire risk．In addition，the amount of carbon residue increasedby8.521%meaning the thermal stability of material is high and showed that using LDHand ZnO together in PP substrate can play a good flame retardant effect．A properproportion can play the best flame retardant effect，and carbon layer cannot produce withfewer amounts to obstruct flame，but excessive addition will make too much ammoniumpolyphosphate (APP) lose activity and damage carbon layer structure to influence flameretardant effect．Nanocomposite prepared at substrate of polystyrene (PS)，when adding massfraction of LDH was1%in the same group，PS7a and PS6b had the best flame retardantproperty effect．PS6b had1%ZnO more than PS7a，but ZnO did not promote synergisticflame retardant and PHRR and THR were slightly increased in PS6b．In addition，theamount of carbon residue relatively declined．We inferred that ZnO played a catalytic roleto facilitate the combustion，and led both flame retardant effect and thermal stabilityproperty decreased．...