US 12,404,384 B2
Method for recycling polyester fabric
Te-Chao Liao, Taipei (TW); Jung-Jen Chuang, Taipei (TW); Zhang-Jian Huang, Taipei (TW); and Yu-Ti Tseng, Taipei (TW)
Assigned to NAN YA PLASTICS CORPORATION, Taipei (TW)
Filed by NAN YA PLASTICS CORPORATION, Taipei (TW)
Filed on Jul. 11, 2022, as Appl. No. 17/862,369.
Claims priority of application No. 110133956 (TW), filed on Sep. 13, 2021.
Prior Publication US 2023/0093536 A1, Mar. 23, 2023
Int. Cl. C08J 11/08 (2006.01); B29B 17/02 (2006.01); B29B 17/04 (2006.01); C08J 3/12 (2006.01); D06P 5/04 (2006.01); B29K 67/00 (2006.01)
CPC C08J 11/08 (2013.01) [B29B 17/02 (2013.01); B29B 17/0412 (2013.01); C08J 3/12 (2013.01); D06P 5/04 (2013.01); B29B 2017/0293 (2013.01); B29K 2067/00 (2013.01); C08J 2367/00 (2013.01); D10B 2331/04 (2013.01)] 10 Claims
 
1. A method for recycling a polyester fabric, comprising:
providing a polyester fabric that is dyed and has dye and water repellent attached thereon;
providing a composite solvent consisting of water and acetic acid mixed with each other, wherein the composite solvent is prepared by mixing 10 to 30 parts by weight of the water with 70 to 90 parts by weight of the acetic acid;
performing an extraction operation including infiltrating the polyester fabric with the composite solvent and extracting the dye and the water repellent to remove the dye and the water repellent from a material of the polyester fabric so that the polyester fabric is restored and has an L value that is not less than 60 and a water repellent content that is not more than 500 ppm; and
carrying out a liquid state polycondensation reaction on the polyester fabric so that an intrinsic viscosity of the polyester fabric is increased and residual impurities of the polyester fabric are further removed.