Scientific name of bridging agent: closed water-based curing agent (non-ionic cross-linking agent) Alias: bridging agent, curing agent, cross-linking agent, fixing agent, adhesive, enhancer, reinforcement agent, fastness improving agent. Main ingredient: Blocked polyisocyanate. This series of curing agents can be stably stored with water-based resins (water-based polyurethane, water-based acrylate, fluorine emulsion, silicone emulsion, etc.) The hydroxyl, carboxyl, amino and other groups on the resin molecular chain react to form a cross-linked structure, which can significantly improve the performance of water-based resin.