Aloe veragel: a new thickening agent for pigment printing

An attempt was made to print cotton fabric with pigments using a new thickening agent based onAloe veragel in combination with sodium alginate. The results were compared with the standard conventional printing recipe containing synthetic thickener, and a favourable effect ofAloe veraintroduction was achieved. The results show that the properties of the printed fabric (sharpness, colour yield, overall fastness properties, softness, and water vapour transmission) are dependent on the percentage ofAloe veragel in the thickener combination, the concentration of printing auxiliaries, and the curing conditions. Optimal printing properties were achieved by using a printing paste containing 80%Aloe vera/20% sodium alginate (700 g kg⁻¹), pigment (50 g kg⁻¹), binder (145 g kg⁻¹), fixer (10 g kg⁻¹), and ammonium sulfate (5 g kg⁻¹), followed by drying at 85 °C for 5 min and curing at 150 °C for 3 min. The sample printed with the new recipe showed superior rubbing fastness and handle properties, with a slightly lower colour yield, when compared with the sample printed with synthetic thickener. Finally, economic issues arising from synthetic thickener substitution are highlighted.