	US 11,965,076 B2
	Self-healing polyurethane (PU) material, double-layer self-healing PU film, and preparation method and use thereof
Xinrui Zhang, Lanzhou (CN); Jing Xu, Lanzhou (CN); Xiaoyue Wang, Lanzhou (CN); Zenghui Yang, Lanzhou (CN); Yaoming Zhang, Lanzhou (CN); Qihua Wang, Lanzhou (CN); and Tingmei Wang, Lanzhou (CN)
Assigned to Lanzhou Institute of Chemical Physics, CAS, (CN)
Filed by Lanzhou Institute of Chemical Physics, CAS, Lanzhou (CN)
Filed on Apr. 25, 2023, as Appl. No. 18/139,146.
Claims priority of application No. 202210682820.8 (CN), filed on Jun. 16, 2022.
Prior Publication US 2023/0407025 A1, Dec. 21, 2023
Int. Cl. C08J 7/04 (2020.01); C08G 18/24 (2006.01); C08K 5/3462 (2006.01)

CPC C08J 7/04 (2013.01) [C08G 18/242 (2013.01); C08K 5/3462 (2013.01); C08J 2375/04 (2013.01)]

13 Claims

1. A double-layer self-healing polyurethane (PU) film, comprising

a soft-layer PU film arranged on a surface of a matrix; and

a hard-layer PU film arranged on a surface of the soft-layer PU film,

wherein the soft-layer PU film is prepared from a PU material I of a self-healing PU material; and the hard-layer PU film is prepared from a PU material II of the self-healing PU material;

the PU material I is prepared from raw materials comprising a polyol substrate I, a diisocyanate I, a tin-based catalyst I, a T-type chain extender, and a chain extender I at a molar ratio of (10-20): (20-40):(1-3):(2-8):(8-12);

the PU material II is prepared from raw materials comprising a polyol substrate II, a diisocyanate II, a tin-based catalyst II, the T-type chain extender, a metal salt, and a chain extender II at a molar ratio of (10-20):(20-40):(1-3):(5-10):(2.5-10):(5-10); a metal ion in the metal salt being one or more selected from the group consisting of Zn²⁺, Cu²⁺, and Fe³⁺;

the polyol substrate I and the polyol substrate II each are independently selected from the group consisting of a polyester polyol and a polyether polyol; and

the T-type chain extender has a structure represented by formula A: