Overview
Anionic emulsion polymers are water-based colloidal dispersions synthesized via free-radical polymerization of vinyl acetate, acrylates, or styrene-butadiene with anionic surfactants. These polymers are favored in industrial applications due to their environmental compliance (low VOC) and versatile performance. Developed in the mid-20th century, they revolutionized the coatings industry by replacing solvent-based systems. Their negative surface charge (from sulfate or carboxylate groups) ensures colloidal stability and compatibility with polar substrates.
Physical and Chemical Properties
Anionic emulsions exhibit a particle size of 50–500 nm, measured by dynamic light scattering. The glass transition temperature (Tg) ranges from -20°C to +30°C, adjustable via monomer selection for flexibility or hardness. Key metrics include solid content (typically 40–60%), pH (7–9), and viscosity (100–5,000 cP). They form continuous films at ambient temperatures through coalescence, with tensile strength of 5–20 MPa when cured. The anionic charge density (0.5–2 meq/g) determines electrolyte tolerance.
Main Applications
In construction, these emulsions modify cement mortars (10–20% dosage) to improve workability and reduce cracking. The adhesives industry uses them for label pastes and wood laminates due to their wet tack properties. Paper coatings utilize anionic emulsions as binders for clay pigments, enhancing printability. Textile applications include non-woven fabric binders, where they provide wash resistance without formaldehyde release.
Safety and Storage
Though classified as non-hazardous under GHS, prolonged skin contact may cause dermatitis. Use PPE (gloves, goggles) during handling. Storage tanks should have slow agitators to prevent sedimentation without causing shear-induced coagulation. Freeze-thaw stability requires glycol additives (e.g., 1,2-propanediol at 5–10%). Shelf life is typically 6–12 months; monitor for viscosity increase or odor change indicating microbial growth (preventable with biocides).
B2B Procurement Guide
Industrial buyers should verify technical datasheets for minimum film-forming temperature (MFFT) matching application needs. Request batch certificates for parameters like residual monomer content (<500 ppm). For global sourcing, ISO 9001-certified suppliers in China (e.g., Shandong or Jiangsu provinces) offer competitive pricing. Tanker truck deliveries (20-ton loads) reduce packaging costs versus drums. Negotiate MOQs based on annual usage projections.
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