Effect of CMSs/APP on the Flame Retardant Properties of PET
SONG Yinghao1, XUE Baoxia2, PENG Yun1,YANG Yaru1, BAI Jie1, NIU Mei1,2
1 College of Textile Engineering, Taiyuan University of Technology, Taiyuan 030600; 2 Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education, Taiyuan University of Technology,Taiyuan 030024
Abstract: Carbon microspheres (CMSs) and ammonium polyphosphate (APP) as the addition materials, CMSs/APP/PET composites were prepared by melt blending method. The flame retardancy of CMSs/APP/PET composites were characterized by cone calorimeter (CONE), limiting oxygen index (LOI) method, vertical burning method (UL-94) and scanning electron microscope (SEM). Then the mass ratio of CMSs to APP and the amount of CMSs/APP were optimized. The results showed that the addition of 3% CMSs increased the LOI value of PET (21%) to 25.1%, and the peak heat release rate (PHRR) decreased from 513.22 kW/m2 to 382.51 kW/m2, but could not pass the UL-94 test. Adding 3% APP only increased the LOI value of PET to 21.9%, but could reach the V-0 level. When the mass ratio of CMSs to APP was 1∶2 and the total mass content was 2%, the flame retardant effect of CMSs/APP/PET composites was the best, with the LOI value up to 27.5%, PHRR value decreasing by nearly 50%, total smoke production (TSP) decreasing from 14.4 m2 to 12.4 m2, residual carbon increasing from 13.2% to 17.3% and UL-94 reaching V-0 rating. The CMSs/APP/PET composites could meet the flame retardant requirements for the different burning directions.
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2018, Vol. 32 
