Preparation And Application Of Non-formaldehyde And Permanent Flame-retardant Agent

In this paper, a new non-formaldehyde permanent flame-retardant agent named QFR-299 used on cotton fabrics was designed and synthesized. The reactants were DMMP, P2O5 and HOCH2CH2OH. The product was a pale yellowish liquid ( aqueous solution with 79% solid) , with a density of 1570g/l, a viscosity of 2.6pa.s, an acid number of 0.6mgKOH/g, a hydroxyl number of 109mgKOH/g and a phosphorus content of 19.5%.We also studied chemical structure and physical performance of QFR-299, and found the best craft by analysis method. Content of flame-retardant agent was 450g/l, content of cross-linking agent was 100g/l, content of catalyst was 30g/l, and curing temperature was 180C, time was 3min.The combustion mechanism of cotton fabrics and mechanism of organic phosphorus flame-retardant agents were studied and discussed in detailed.By the best craft, the flame-retardant finishing results were as follows. Carbonized length was about 11cm, index of oxygen was more than 28, but with a greater loss of strength, the loss of tearing strength was about 50% and the loss of breaking strength was about 35%.The finishing result was fairly permanent. After washing 30 times, carbonized length was about 18.8cm, index of oxygen was more than 27.0.