Effect of coating methods on flame retardant properties of aramid fiber
Firstly,ammonium polyphosphate(APP),melamine(MEL),pentaerythritol(PER),thermoplastic polyurethane(TPU)elastomer and aluminium silver paste(AlU)were used to form four kinds of intumescent flame retardant polyurethane silver paste(IFR/TPU/AlU)solutions with different mass ratios,and then the four solutions were coated on the surface of aramid fabrics by the direct coating method and the foam coating method to investigate the influence of two coating methods on the flame retardant properties of aramid fabrics.The results of cone calorimetry test and vertical combustion test showed that the best IFR/TPU/AlU solution formulation for flame retardancy was m(APP)∶m(MEL)∶m(PER)∶m(TPU)∶m(AlU)= 12∶6∶2∶16∶20.Compared with the uncoated aramid fabric,the peak rate of heat release and the total heat release of ZT-3 and FP-3 were reduced by 74.3%,9.9%and 76.9%,10.2%,respectively,and the residual carbon rates of them were 7.4%and 7.5%,respectively.The flame retardant properties of coated aramid fabrics in the weft direction was better than that in the warp direction,and the flame retardant properties of directly coated aramid fabrics was better than that of foam coated aramid fabrics.
万方数据
维普
