The Waterborne Symposium 2025

Co-Authors: Dr. Peter Greenwood, Global Technical Development Manager, Inorganic Specialties, Nouryon

Abstract

One of the primary challenges for low-VOC coatings is achieving smooth film formation, acceptable block resistance, and adequate film hardness. Block resistance depends on both bulk and surface properties. This article examines the effects of adding colloidal silica on the block resistance of acrylic paint. Colloidal silica enhances the hardness and durability of coatings, improving their resistance to abrasion, scratches, and other properties. Additionally, it contributes to smoother film formation and better weather resistance, making the coating less likely to stick to itself when two painted surfaces come into contact.