Preparation and application of a relatively high molecular durable flame retardant for cotton
A relatively high molecular mass,formaldehyde-free,and halogen-free ammonium phosphate flame retardant(ATPPA)was synthesized using polyglycerol-3,phosphoric acid,and urea as the main raw ma-terials,and the ATPPA structure was characterized.The flame retardant was grafted onto cotton fabrics by the process of ″dipping,rolling and curing″.The limiting oxygen index of the treated cotton with 22.54%weight gain was 47.3%.After 50 cycles of washing(LCs)according to AATCC 61-2013 2A standard,its limit oxygen index could still be maintained at 33.2%,indicating that the treated cotton has good durability.Scanning elec-tron microscopy testing showed that ATPPA had almost no influence on the structure of the cotton fibers.Cone calorimetry and thermogravimetry analyses indicated that ATPPA promoted the dehydration of cotton fab-rics into carbon at high temperatures,thus generating no or less flammable gases and achieving flame retar-dancy.
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