Abstract:

In order to overcome the shortcomings of yellowness by anti-wrinkle finishing of ramie fabric with citric acid, the polycarboxylic acid and polyol mixed finishing process of ramie fabric was studied. Owing to the reduction of aconitic acid and other unsaturated acid by the esterification reaction between citric acid and polyol during the baking stage, the whiteness of the finished ramie fabric significantly improved. The influences of the type of alcohol, concentration of citric acid, mole ratio of citric acid and glycerol, and curing process were investigated. The results indicated that the optimum finishing results are obtained by the polycarboxylic acid and polyol mixed finishing process when the mole ratio of glycerol and citric acid is 2:1 and mass concentration of citric acid is 4 %, the mass concentration of sodium hypophosphite is 5.5 %, the mass concentration of JFC is 1 g/L, the drying temperature is 100 ℃, the curing temperature is 175 ℃, and the curing time is 3 min. The finished ramie fabric has crease recovery angle 194 °, CIE whiteness 76.83 % and breaking strength 375 N.

Key words: ramie fabric, citric acid, polyol, anti-crease finishing, whiteness