Abstract:

In order to impart excellent flame retardant property, 1 % Chitosan solution with pH value of 5 and 1.5 % sodium phytate solution with pH value of 2 were alternatively deposited on dopamine modified polyester/cotton 65/35 fabric by electrostatic layers-by-layer self-assembly method. The deposited time for the first bilayer was 15 min, after that, it was 5 min. In this treatment, 15 bilayrs were deposited. Limiting oxygen index (LOI), char length, thermal gravimetric analysis, heat release rate and morphology of char residue were discussec. The results show that dopamine modification can increase the reactivicy of flame retardant components. The treated polyester/cotton fabric significantly improved its flame retardancy compared with control fabric. LOI of treated polyester/cotton fabric is 28.7% while 18.8% of control fabrecs. The modified polyester/cotton 65/35 fabric decomposed earlier and char residue increased by 5.7% compared with control fabric. Average heat release rate(HRR) and peak HRR(PHRR) are 14.16 kW/m2 and 51.07 kW/m2, decreased by 84.62% and 78.47%, respectively, compared with control fabric. Flame retardant treatment can reduce the fire hazard during combustion.

Key words: polyester/cotton blended fabric, flame retardant peoperty, dopamine, modification, electrostatic layer-by-layer self-assembly, chitosan