Compositions for spray dyeing of cellulosic fabrics
View Patent ↗Compositions are provided for spray dyeing of a cellulosic, such as cotton, fabric or garment. The compositions include a reactive dye, a wetter, an alkali, and water. The present compositions are made by first mixing the reactive dye, the wetter, and the water to form a solution, and thereafter adding the alkali to the solution.
1. A method of making a composition for spray application onto surfaces of a cotton fabric, consisting of: mixing together a reactive dye, a wetter, and water to form a solution, the wetter being selected from the group consisting of a first surfactant, wherein the first surfactant is a blend of sulfuric acid disodium salt and phosphoric acid trisodium salt, and a second surfactant, wherein the second surfactant is sodium dioctyle sulfosuccinate; and adding an alkali to the solution to complete the composition at a time that allows spray application of the solution onto the surfaces of a cotton fabric before the dye hydrolyzes, the alkali being selected from the group consisting of a first combination of soda ash, potassium carbonate and phosphate, and a second combination of sodium silicate and a caustic.
2. The method of claim 1 , wherein the wetter, the reactive dye, and the alkali are anionic or non-ionic.
3. The method of claim 1 , wherein the wetter comprises an amount between 5 g/l and 40 g/l.
4. The method of claim 1 , wherein the reactive dye is an azo metal complex or dioxazine.
5. The method of claim 4 , wherein the reactive dye comprises an amount between 10 g/l and 80 g/l.
6. The method of claim 1 , wherein the alkali comprises an amount between 3 g/l and 20 g/l.
7. The method of claim 6 , wherein the alkali has a pH between 10.0 and 11.0.
8. A method of making a composition for spray application onto surfaces of a cotton fabric consisting of: mixing together a reactive dye, a wetter, water and at least one of a chelator, a dye leveling agent, a defoamer, and an anti-reducing agent, to form a solution, the wetter being selected from the group consisting of a first surfactant, wherein the first surfactant is a blend of sulfuric acid disodium salt and phosphoric acid trisodium salt, and a second surfactant, wherein the second surfactant is sodium dioctyle sulfosuccinate; and adding an alkali to the solution to complete the composition at a time that allows spray application of the solution onto the surfaces of a cotton fabric before the dye hydrolyzes, the alkali being selected from the group consisting of a first combination of soda ash, potassium carbonate and phosphate, and a second combination of sodium silicate and a caustic.