SaitechAI • Binder Tech Card
Dr E. Ramanathan PhD WhatsApp 9444929163
Styrene-Acrylic Copolymer Emulsion (Paint Binder)
Typical properties & application guidance for architectural coatings (primers, putties, high-PVC paints, textures).
Key Specifications
| Chemistry | Styrene-Acrylic copolymer emulsion |
|---|---|
| Solids (wt%) | 49 – 51% |
| Viscosity (25 °C) | ~20 – 80 P (Brookfield, #4/20 rpm) |
| pH | 8.0 – 10.0 |
| MFFT | ~17 °C |
| Appearance | Bluish translucent emulsion |
| Film features | Hard & tough film; good flexibility; gloss potential; wet-scrub & abrasion resistance; alkali & water resistance |
| Packaging | HDPE drums (~220 kg) / bulk options |
Recommended Uses
Exterior/Interior Primers
High-PVC Masonry Paints
Acrylic Putty
Texture Coatings
Cementitious Surfaces
Why choose Styrene-acrylic emulsion?
Balances cost/performance for primer & putty applications, supports high pigment loading, and offers robust alkali resistance needed on fresh masonry. Resin manufacturers and suppliers can contact us and deliver samples and obtain the validation certificate from the consultant on successful trials with our clients.
Formulation Pointers
- Coalescence: With MFFT ≈ 17 °C, add coalescent (e.g., DPM/Texanol/TPM) ~1.0–2.5% on binder solids for low-temp film formation; optimize by scrub & block tests.
- pH Window: Maintain mill-base pH 8.5–9.5 (ammonia/AMP/NaOH) for stability; check post-add pH drift.
- PVC: Suited for medium-to-high PVC systems (primers/putties). Ensure CPVC margin for scrub resistance.
- Dispersants: Sodium polyacrylate/AA-MA types; target Grind ≤ Hegman 6.5 for TiO₂/Extenders.
- Thickening: HEUR/HASE blends for ICI 0.5–0.8 Pa·s and KU 90–100 (primer). Adjust for application method.
- Additives: Silicone/Silane defoamers (two-stage), wetting agents (low foam), in-can + dry-film preservatives as per local regulations.
Processing & QC
- Order of Addition: Water → Dispersant → Wetting → Defoamer → Pigments/Extenders (grind) → Binder (let-down) → Rheology → Coalescent → Biocide → Final adjust.
- Key Tests: SG, NV%, pH, KU/ICI, Scrub (IS/ASTM), Adhesion (X-cut), Alkali resistance, Water soak, Salt spray for primers on metal masonry interfaces where applicable.
- Shear: Avoid over-shear post-let-down to prevent viscosity drop & foam entrapment.
Substrate & Environment
- Ensure surface is sound, clean, dry; moisture < 12% for masonry; pH ≤ 10 for fresh cement surfaces.
- Application temp ≥ 10–12 °C; avoid condensation/dew within 24 h of application.
Storage & Handling
- Store sealed at ~15–30 °C; protect from frost & direct sun.
- Use clean lines/pumps; avoid copper/brass contact; follow FIFO.
Note: Values shown are typical. Always confirm with the latest official TDS/SDS from Jesons for your supply lot and regional compliance. Conduct lab validation and pilot trials before production.
