Carbamoylethylated cassia gum as thickener in printing linen fabrics

Galactomannan gum isolated from the Cassia seeds was subjected to carbamoylethylation which involved the reaction of the gum with acrylamide along with sodium hydroxide as a catalyst. Four carbamoylethylated Cassia gum samples having different nitrogen content [2.78 to 4.28%] were prepared via changing the amount of the etherifying agent used [25 to 100g acrylamide/ 100g dry gum]. Modification of Cassia galactomannan gum via carbamoylethylation converts the gum into a water soluble derivative and increased its stability to storing. The results related with the rheological characterization of the carbamoylethylated Cassia gum derivatives showed that it exhibited non-Newtonian pseudoplastic behaviour irrespective of the degree of carbamoylethylation. Increasing the extent of carbamoylethylation was accompanied by an enhancement in the apparent viscosity. Storing of the pastes for three days caused a decrease in their apparent viscosties, which may be due to partial hydrolysis of the modified gum molecules. It can be concluded that carbamoylethylated Cassia gum derivatives could be used successfully as suitable thickening agents in reactive printing of linen fabrics

Improving polyester fabrics working properties using alkali printing

Two different weights of 100% polyester fabrics were printed with meypro gum thickening agent containing sodium hydroxide with different concentrations. Different steaming time and temperature were also applied to determine the optimum conditions for this alkali printing of polyester fabrics. Polyester fabrics including first prints were overprinted with a second print paste containing disperse dye. Some working properties of the printed fabrics like air permeability and water repellency were improved. Colour strength of the printed areas: was also increased. Using of ammonium compound surfactants increases weight loss and accelerates the treatment