Dual‐Phase Engineered Graphene‐Reinforced Waterborne Multicolor Coatings With Multifunctional Weatherability and Corrosion Resistance

Abstract

Waterborne multicolor stone‐like (SL) coatings have been widely employed in architectural exterior finishing, but they often suffer from insufficient UV resistance, low mechanical strength, and unsatisfactory long‐term durability. To overcome these drawbacks, we report a dual‐phase functionalization strategy by synchronously introducing graphene (GE) into dispersed color particles and a continuous polymer matrix. GE was dispersed in aqueous media with the assistance of graphene oxide (GO) through π–π interactions and further stabilized by 1‐Allyloxy‐3‐(4‐nonylphenol)‐2‐propanol polyoxyethylene(10)ether (ANPEO 10 ), then incorporated into silicone–acrylic emulsions via in situ polymerization to construct GE multi‐color stone‐like (GSL) coatings. The as‐fabricated GSL coatings present enhanced thermal conductivity and more uniform heat diffusion. A strong UV absorption peak at 345 nm is well retained with only 3.3% attenuation after 600 h of aging. The maximum tensile stress reaches 5.7 MPa, 80.78% higher than the pristine coating, and the corrosion resistance is also significantly improved. This work provides a reliable pathway for developing high‐performance multifunctional waterborne coatings for advanced architectural applications.