Synthesis Of Inflating Sulfonate Flame Retardant And Research Of Its Flame Retardancy Effect On PC

The flammable disadvantages of polycarbonate (PC) limit its using in specific areas. Atpresent the research direction of flame retardants which using in PC mainly focused on: highefficiency, environmental protection, multielement synergistic flame retardant, improving thecompatibility with base material, etc. On the basis of multielement synergistic flame retardant,the following three aspects were mainly studied in this paper:(1) KTS (sulfonate type flame retardant which containing nitrogen) and RDP (tetraphenylresorcinol bis(diphenylphosphate)) were combined into one flame retardant which containingnitrogen, phosphorus, sulfur, and examined the effect of intermolecular multielementsynergistic flame retardant. Synergistic effect was produced obviously between KTS and RDPand the flame retardancy of the PC composite material significantly improved. The limitingoxygen index (LOI) value can increase12units when the ratio of compound was1:100, andPC composite material can pass the vertical burning level of V-0. The results of mechanicalproperties researches showed that when compared with using KTS alone its tensile strength,bending strength increased by5.45%and8.50%， impact strength decreased by8.96%,respectively. Thermal stability showed that thermal degradation rates were reduced, the initialdecomposition temperature were reduced, the char yield were improved in high temperature.The study of thermal decomposition kinetics according to Broido method showed that theapparent activation energy (E) of PC were increased. Water resistance test showed that theaddition of RDP improved KTS problem of poor water resistance.(2) Two flame retardants which containing sulfur, nitrogen and phosphorus three elementsin one intramolecular (SNP-Na and SNP-K) were synthesized using cyanuric chloride,sulphanilic acid and9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) as rawmaterials. The test of thermal stability showed that SNP-Na and SNP-K had good thermalstability at high temperatures, the initial decomposition temperature (380℃) is greater than the PC processing temperature (270℃).(3) To studing the intramolecular multielement synergistic flame retardant effect, SNP-Naand SNP-K were added to PC, respectively. The LOI value were34.8%and34.3%whenSNP-Na and SNP-K content was0.075wt.%, respectively. PC composites could achieve thevertical combustion level of V-0and no dripping. The initial decomposition temperature andthe thermal degradation rates of PC were reduced after adding SNP-Na or SNP-K. Theformation of fluffy and continuous carbon layer were facilitate. The study of thermaldecomposition kinetics according to Broido, Kissinger and Flynn-Wall-Ozawa (FWO)methods showed that PC degradation were promoted and the value of E were reduced. CONEcalorimeter (CONE) analysis showed that the SNP flame retardants may exist both gas phaseand condensed phase mechanism. Different metal ions had a significant impact on the thermalstability and the morphology of char layer after burning.