Solvent-Free PU Slurry for UV-Cured Protective Glove Coatings

The patent changes the fundamental parameter of the slurry composition from solvent-based to solvent-free. By using a two-component system where component A (polyol mixture) and component B (prepolymer) react upon mixing to form PU foam in situ, the patent eliminates the need for DMF solvent while achieving the desired mechanical properties through controlled foam cell structure and crosslinking density

The patent utilizes phase transition of the polyol mixture during the reaction process. When component A and component B are mixed, the exothermic reaction causes localized heating and phase changes that lead to foam formation. The controlled phase transition from liquid to foam structure creates the desired cellular morphology that provides both wear resistance and eliminates solvent residues

The patent extracts and eliminates the toxic DMF solvent from the production process entirely. By using a solvent-free two-component system that cures in situ, the patent removes the need for multiple immersing and washing steps required in conventional solvent-based processes, thereby reducing production costs while maintaining or improving wear resistance

The patent enables the slurry to self-cure and self-foam upon mixing of components A and B. The exothermic reaction between isocyanate and polyol groups provides self-heating that drives foam formation and curing without external energy input, eliminating the need for complex drying ovens and washing facilities, thereby simplifying the production process and reducing costs