Preparation and application of durable non-formaldehyde flame retardants for cotton

An oligomeric phosphate ester non-formaldehyde flame retardant containing hydroxyl was synthesized from DMMP and glycol,and its structure was characterized by IR,1H-NMR and 31P-NMR.By discussing the reaction conditions,the optimal synthesis process was obtained.The cotton fabric was finished by the flame retardant and the process was optimized by exploring the amount of flame retardant and crosslinker,and curing temperature.TGA showed that the main pyrolysis temperature of the finished cotton declined by 47.05-75.86 ℃,and the amount of residue increased by 67% after being burned.It proved that the fabric was difficult to burn.SEM showed that when the cotton fabric without flame retardant finishing burned,its carbon layer collapsed.On the contrary,the flame retardant finished cotton kept the original fibroid conformation,showing good flame retardancy.After 12 times of washing,the flame retardant finished cotton was still up to the standard GB B2,indicating good washing fastness.