US 12,331,458 B2
Method for decolorizing polyester fabric and polyester fabric
Chung-Yang Chuang, Hsinchu (TW); Chih-An Chen, Hsinchu (TW); Min-Yan Dong, Hsinchu (TW); Chang-Jung Chang, Taoyuan (TW); and Hui-Min Wang, Hsinchu (TW)
Assigned to INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE, Hsinchu (TW)
Filed by INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE, Hsinchu (TW)
Filed on Apr. 19, 2023, as Appl. No. 18/302,873.
Claims priority of application No. 111150069 (TW), filed on Dec. 27, 2022.
Prior Publication US 2024/0209569 A1, Jun. 27, 2024
Int. Cl. D06P 5/13 (2006.01); C08J 7/02 (2006.01); D06P 3/52 (2006.01)
CPC D06P 5/131 (2013.01) [C08J 7/02 (2013.01); D06P 3/52 (2013.01); D06P 5/132 (2013.01); Y02W 30/62 (2015.05)] 13 Claims
OG exemplary drawing
 
1. A method for decolorizing polyester fabric, comprising:
providing a dye-attached polyester fabric;
immersing the dye-attached polyester fabric in a first solution, obtaining a treated polyester fabric, wherein the first solution comprises water, a first swelling agent and a solubility promoter, wherein the first swelling agent is C1-C6 aliphatic carboxylic acid, C7-C13 aromatic carboxylic acid, alkali metal hydroxide, alkaline earth metal hydroxide, or a combination thereof, and the solubility promoter is R14NCl, peroxide, persulfate, cerium salt, chlorine-containing inorganic acid, chlorine-containing inorganic salt, or a combination thereof, wherein R1 is independently C1-C6 alkyl group, phenyl group, benzyl group, or phenethyl group, and
immersing the treated polyester fabric in a second solution, obtaining a decolorized polyester fabric, wherein the second solution comprises water, a second swelling agent and an auxiliary swelling agent, wherein the second swelling agent is C3-C8 aliphatic alcohol, C4-C8 aliphatic ketone, C8-C16 aromatic ketone, C6-C10 phenolic compound, or a combination thereof, and the auxiliary swelling agent is ethylene carbonate, propylene carbonate, dimethyl acetamide, dimethyl formamide, dimethyl sulfoxide, ethyl acetate, tetrahydrofuran, dihydrolevoglucosenone, or a combination thereof.