The study on properties of dyeing, colour fastness and uv protection of cationic treated hemp fabric with natural dye extracted from Arabica coffee ground
Abstract:
The main purpose of the first part of this research was to investigate the optimal conditions of cationic treating and dyeing with natural dye solution extracted from Arabica coffee grounds of hemp fabric including temperature, time and concentration of both solutions by using liquor ratio (fabric to solution) of 1:100. Color strength (K/S value) and lightness (CIELAB system) of treated and dyed fabrics were measured to indicate dye absorbency and compare to untreated hemp fabric. It was found that the most optimal conditions for cationic treatment dyeing were the treating of 10 %owf of cationic agent at 90◦C for 60 min following by color dyeing with 80%owf of dye solution at 90◦C for 60 min. For the second part, the effect of mordant types (aluminum potassium sulfate (AlK (SO4)2), copper sulfate (CuSO4), ferrous sulphate (FeSO4), and stannous chloride (SnCl2)) on different color shades of coffee grounds dyed fabrics by using post-mordant method wasstudied. The results of K/S and lightness values showed that the dyed fabrics treated with AlK(SO4)2, CuSO4, FeSO4, or SnCl2 yielded yellowish brown, grayish brown, greenish brown, and pale brown, respectively. Finally, color fastness properties and UV protection factor (UPF) of the dyed fabrics obtained from the second part were determined by grayscale imaging. The mordanted fabrics were more slightly colorfast to washing, water, abrasion, spireration, artificial light than the untreated one, which were range in good to excellent level (level 4-5).In addition, the hemp fabrics dyed with 80%owf of coffee grounds solution and treated with 80%owf of FeSO4 mordant provided the highest UPF.