	US 12,077,883 B2
	High-strength thermal-stability polyester industrial yarn and preparation method thereof
Shanshui Wang, Suzhou (CN); Fangming Tang, Suzhou (CN); Lili Wang, Suzhou (CN); Yiwei Shao, Suzhou (CN); Yanli Zhao, Suzhou (CN); Xiaoyu Wang, Suzhou (CN); and Chaoming Yang, Suzhou (CN)
Assigned to JIANGSU HENGLI CHEMICAL FIBRE CO., LTD., Suzhou (CN)
Appl. No. 18/269,968
Filed by JIANGSU HENGLI CHEMICAL FIBRE CO., LTD., Suzhou (CN)
PCT Filed Aug. 25, 2021, PCT No. PCT/CN2021/114425 § 371(c)(1), (2) Date Jun. 28, 2023, PCT Pub. No. WO2022/142406, PCT Pub. Date Jul. 7, 2022.
Claims priority of application No. 202011602597.9 (CN), filed on Dec. 29, 2020.
Prior Publication US 2024/0052529 A1, Feb. 15, 2024
Int. Cl. D01F 6/84 (2006.01); C08G 63/183 (2006.01); C08G 63/685 (2006.01); C08G 63/80 (2006.01); C08G 63/86 (2006.01); C08G 63/91 (2006.01); D01D 5/08 (2006.01); D01F 11/08 (2006.01)

CPC D01F 6/84 (2013.01) [C08G 63/183 (2013.01); C08G 63/6856 (2013.01); C08G 63/80 (2013.01); C08G 63/866 (2013.01); C08G 63/916 (2013.01); D01D 5/08 (2013.01); D01F 11/08 (2013.01); D10B 2331/04 (2013.01); D10B 2401/063 (2013.01)]

11 Claims

1. A thermal-stability polyester industrial yarn, comprising polyester, wherein the polyester comprises a terephthalic acid, an ethylene glycol and a 2,6-pyridinedicarboxylic acid, and wherein 2,6-pyridinedicarboxylic acid is coordinated by an Fe³⁺ coordination agent;

wherein a molar ratio of the terephthalic acid to the 2,6-pyridinedicarboxylic acid is 1:(0.03-0.05);

wherein O atoms on two carbonyl groups and N atoms of the 2,6-pyridinedicarboxylic acid are involved in the coordination;

wherein a coordination structure formed between the Fe³⁺ coordination agent and the 2,6-pyridinedicarboxylic acid is:

wherein a glass transition temperature of the thermal-stability polyester industrial yarn is 88-92° C.,

wherein the thermal-stability polyester industrial yarn is formed by soaking wound fibers in an aqueous solution of the coordination agent at 80-100° C. for 48-72 hours, and a concentration of the aqueous solution of the coordination agent is 0.1-0.2 mol/L; and

wherein the coordination agent is FeCl₃, Fe(NO₃)₃or Fe₂(SO₄)₃.