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Redispersible polymer powder products are water-soluble, redispersible powders—such as ethylene/vinyl acetate copolymers, vinyl acetate/vinyl versatate copolymers, and acrylic copolymers—produced via spray drying with polyvinyl alcohol serving as the protective colloid.
Polyvinyl alcohol is soluble in cold water and hot water, forming a transparent colloidal solution with good film-forming properties. The film is flexible, has a certain strength, is oil-resistant and solvent-resistant, is neutral, has stable adhesion in an alkaline environment, and has good adhesion to cement, paper, wood, and fibers.
Hydroxypropyl starch ether is a modified starch produced through etherification. Commonly used in dry-mix mortars as a rheology modifier, it is cold-water soluble and exhibits strong thixotropy, providing sag and slip resistance while improving workability.