Dyeing of fibers using supercritical carbon dioxide and electrophoresis
View Patent ↗The present technology provides an illustrative method for dyeing textiles that includes intermixing a dye with super-critical carbon dioxide (sc-CO 2 ) to form a dye solution and immersing a fabric in the dye solution. The method further includes applying an electric field to the dye solution to cause charged particles of the dye solution to separate and cause the dye to diffuse into the fabric.
1. A method for dyeing textiles, the method comprising:
intermixing a dye with super-critical carbon dioxide (sc-CO 2 ) to form a dye solution;
contacting a fabric with the dye solution; and
applying an electric field to the dye solution to cause separation of charges within particles of the dye solution and to cause the dye to diffuse into the fabric.
2. The method of claim 1 , wherein the fabric comprises at least one of wool, cotton, silk, linen, or ramie fibers.
3. The method of claim 1 , wherein the dye is a hydrophilic dye.
4. The method of claim 1 , wherein the dye is a polar dye.
5. The method of claim 1 , wherein said intermixing a dye with sc-CO 2 includes increasing the temperature of the dye solution and maintaining the dye solution at an elevated pressure.
6. The method of claim 1 , wherein the electric field comprises a strength of at least 300 kilovolts per meter.
7. The method of claim 1 , further comprising treating the dye with a surfactant to facilitate said intermixing.
8. An apparatus for dyeing textiles, the apparatus comprising:
an intermixing component configured to retain and intermix a dye with super-critical carbon dioxide (sc-CO 2 ) to form a dye solution;
a fabric immersion component configured to contact a fabric with the dye solution; and
a cathode and an anode configured to produce an electric field in the dye solution, wherein the electric field causes separation of charges with particles of the dye solution to ionize and cause the dye to diffuse into the fabric.
9. The apparatus of claim 8 , wherein the charged particles comprise positively charged particles, and wherein the fabric immersion component is configured to provide the fabric nearer to the cathode than to the anode.
10. The apparatus of claim 8 , wherein the charged particles comprise negatively charged particles, and wherein the fabric immersion component is configured to provide the fabric nearer to the anode than to the cathode.
11. The apparatus of claim 8 , wherein the electric field comprises a strength of between 300 kilovolts per meter and 400 kilovolts per meter.
12. The apparatus of claim 8 , wherein the cathode and the anode are separated by a distance of about 1 cm.
13. The apparatus of claim 8 , wherein the intermixing component comprises a pressure vessel that is configured to maintain the dye solution at an elevated pressure.
14. The apparatus of claim 13 , wherein the cathode and the anode are located within the pressure vessel.
15. The apparatus of claim 13 , wherein the pressure vessel is further configured to elevate the temperature of the dye solution and to the maintain the dye solution at the elevated temperature.
16. The method of claim 6 , wherein the electric field comprises a strength of between 300 kilovolts per meter and 400 kilovolts per meter.
17. The method of claim 1 , wherein the contacting a fabric with the dye solution comprises passing the fabric through the dye solution using a reel-to-reel transfer mechanism.
18. The apparatus of claim 8 , wherein the dye is a hydrophilic dye.
19. The apparatus of claim 8 , wherein the electric field comprises a strength of at least 300 kilovolts per meter.
20. The apparatus of claim 8 , further comprising a reel-to-reel transfer mechanism configured to pass the fabric from a feed reel through the dye solution to a take up reel.