Preparation and Properties of Flame Retardant Cotton Fabric by Surface Chemical Grafted Modification

doi:10.7503/cjcu20170032

Abstract

Abstract:

Cotton fabric was firstly selective oxidized by sodium periodate to formed aldehyde groups, ethylenediamine was chosen and reacted with aldehyde groups. Then, the flame retardant dimethyl phosphite was grafted on cotton fabric surface by phosphine hydride addition reaction. Finally, trimethylolmelamine was grafted on the surface of cotton fabric and the phosphorus-nitrogen containing flame retardant cotton fabric was obtained. The structure of the modified cotton fabric was characterized by Fourier transform infrared spectroscopy(FTIR). The flame retardancy of the modified cotton fabric was evaluated by limiting oxygen index(LOI) tests, and the combustion behavior was investigated by cone calorimeter tests. The water washing durability of the modified cotton fabric was investigated by washing in soap water for 10 times at 40℃, and the surface morphology was studied by scanning electron microscopy. The result indicated that the LOI value of the obtained modified cotton fabric dramatically increased from (19.5±1.0)% for pure cotton fabric to (43.1±1.0)%, and after washing test, the LOI value slightly decreased to (42.6±1.0)%, which indicated that the obtained cotton fabric remained superior flame retardancy and possessed excellent washing durability. The surface chemical grafted modification for cotton fabric enhanced the char-forming ability of cotton fabric during combustion, and the formed intumescent char layer protected the inner cotton fabric from further degradation and combustion, thus enhanced the flame retardancy of cotton fabric.

Key words: Cotton fabric, Surface grafted modification, Flame retardancy, Water durability, Charring capability

CLC Number:

O636

TrendMD:

LIU Ziyi, XU Miaojun, WANG Qi, LI Bin. Preparation and Properties of Flame Retardant Cotton Fabric by Surface Chemical Grafted Modification[J]. Chem. J. Chinese Universities, 2017, 38(8): 1477.

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