What Are Redispersible Polymer Powders (RDP)?
Redispersible polymer powders are white, free-flowing powders produced by spray-drying polymer dispersions. When these polymer powders are mixed with water, they can re-disperse and form polymer dispersions with the same properties as the original dispersion. Redispersible polymer powders are added to mortar to increase the flexibility and cohesiveness of mortar. This forms a continuous polymer film that helps improve water retention, enhance the bond strength of mortar, and improve the workability of dry mix mortar. Production Process of Redispersible Polymer Powder (RDP) Redispersible polymer powder is produced from latex emulsions through a process of spray-drying macromolecular dispersions under specific conditions. To prevent the latex particles from bonding together during production, polyvinyl alcohol is added. These polymer powders are typically based on acrylic polymers, polyvinyl acetate, copolymers of vinyl acetate with vinyl versatate, or with ethy...