Patent ID: 11965076
Assignee: LANZHOU INSTITUTE OF CHEMICAL PHYSICS, CAS
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
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:,