Preparation and properties of fluorine-containing flame retardant transparent polycarbonate
To obtain polycarbonate(PC)materials with good flame retardancy,transparency and thermal aging stability,polytetrafluoroethylene(PTFE)and octaphenyl silsesquioxane(OPS)were added into PC containing potassium perfluorobutylsulfo-nate(PPFBS)to prepare fluorine-containing flame-retardant transparent PC composites.The effects of PTFE/PPFBS and OPS/PPFBS on the flame retardant,physical and mechanical properties of PC were studied,and the dose-effect relationship was explored.The effect of thermal aging treatment on the flame retardancy of PC composites was also investigated.The results show that the introduction of PTFE and OPS improve the flame retardancy of PC materials.The PC composites with 0.1 wt%PTFE or OPS can reach the UL 94 V-0 rating in vertical combustion tests.The limiting oxygen index of PC composites with 0.2 wt%PTFE or OPS can reach 40.6%and 42.2%,respectively.Compared with the composite with PTFE,the PC composite with OPS shows better trans-parency.The addition of PTFE or OPS has little effect on the tensile strength of PC composites.The PC composites with 0.2 wt%PTFE or 0.1 wt%OPS can maintain good toughness.The PC composites with PTFE or OPS after thermal aging treatment can reach UL 94 V-0 rating in the vertical combustion test.The results of cone calorimetry tests after thermal aging treatment show that OPS and PPFBS can better play a synergistic flame retardant effect,effectively inhibiting the heat release of PC materials and improving the char residue yield.Fluorine-containing transparent PC composites with excellent flame retardancy and thermal aging stability have broad application prospects in high-end manufacturing industry.
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