Wholesale Water Based Manufacturers & Factories

Conventional 100% solids UV systems achieve hardness by increasing crosslink density using multi-functional monomers like TMPTA or DPHA, which causes embrittlement and high curing shrinkage. Waterborne polyurethane acrylates (WPUA) decouple this mechanism. The polyurethane backbone contains hard segments (isocyanates and short chain diols) for physical hardness and soft segments (polyether or polyester glycols) that retain elastic flexibility. Acrylate groups terminate the chains, providing dense crosslinking at the boundary layers without causing the polymer matrix to become brittle.

Proper flash-off is essential for waterborne UV formulations. If curing lamps are triggered while water remains inside the coating layer, trapped moisture turns to steam, creating micro-voids, haziness, and reduced gloss. The industrial standard involves passing the coated substrate through a convection IR or hot-air drying zone (typically 50°C to 70°C for 2 to 5 minutes) until residual water drops below 2-3%. After complete physical coalescence, the film passes under high-intensity UV lamps for photopolymerization, converting into a chemically resistant polymer within seconds.

To prevent ester hydrolysis during overseas transport in warm, humid containers, our production base builds the polymer backbone using polycarbonate diols (PCD) and sterically hindered cycloaliphatic isocyanates (such as IPDI or H12MDI). Furthermore, the internal carboxylate salt counter-ions are neutralized with optimized tertiary amines, preventing pH drops below 7.2. Products are shipped in fluorinated or anti-corrosive polyethylene drums with integrated thermal buffering guidelines, ensuring 12+ months of stability.

Yes, but production lines require two minor operational adjustments: drying capability and contact material compatibility. First, a thermal or forced-air drying zone must be positioned between the application station (roller, curtain, or spray) and the UV light array. Second, because water possesses higher surface tension than organic solvents, formulators often incorporate substrate-wetting polyether siloxane additives, and fluid delivery lines must use stainless steel (304/316) or inert engineering plastics to prevent corrosion.