High-strength self-repairing ionic gel and preparation method thereof

• Main Authors: YOU ZHENGWEI, HUANG HONGFEI, YANG LEI, ZHU WENFAN, WANG YIHAN, SUN LIJIE
• Format: Patent
• Language: Chinese; English
• Published: 23.06.2023
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

The invention relates to high-strength self-repairing ionic gel and a preparation method thereof. The preparation method comprises the following steps: (1) dissolving diisocyanate containing a benzene ring or asymmetric alicyclic structure and a catalyst in a solvent, and adding polyester polyol for nucleophilic addition reaction to obtain a polyurethane prepolymer; (2) adding a mixed solution containing dihydroxyl or diamino aromatic disulfide and glycerol into the polyurethane prepolymer, and carrying out nucleophilic addition reaction to obtain linear polyurethane; and (3) adding the ionic liquid solution into linear polyurethane, carrying out high-temperature crosslinking, and drying. According to the method, aromatic disulfide bonds with higher reversibility are introduced into a polyurethane network, so that the ionic gel is endowed with excellent room-temperature self-healing performance, isocyanate with an asymmetric alicyclic structure is selected as a hard chain segment, exchange of the disulfide bo