Dr E. Ramanathan PhD
For a two-component cementitious hybrid acrylic waterproof coating, you need a high solids, pure acrylic emulsion binder with the following characteristics:
🔹 Ideal Binder Properties (Part A – Liquid Component)
| Parameter | Ideal Value / Range |
|---|---|
| Type | Pure acrylic or acrylic-polymer hybrid |
| Solids Content | 45–55% |
| pH | 7–9 |
| Elongation @ Break | ≥ 300% |
| Minimum Film Forming Temp (MFFT) | < 5°C |
| Glass Transition Temp (Tg) | −10°C to 0°C |
| UV Resistance | High (non-yellowing, chalking-free) |
| Water Absorption | Low |
| Compatibility | Good with OPC, silica, talc, RDP |
🔹 Recommended Products in India (High-Solids Acrylic Emulsions)
| Brand | Product Name | Features |
|---|---|---|
| BASF | Acronal® Edge 4782 | High elongation, cement compatibility, UV-stable |
| Dow | Rhoplex™ EC-1791 | Elastomeric, waterproofing binder |
| Arkema | Encor® 601 | Flexible, for cementitious systems |
| Visen | Visicryl 7550 | Cost-effective elastomeric grade |
| Kamsons | Kamcryl 100E | For waterproof coatings, high solid |
| Mallak | Mallakcoat AE 442 | Flexible polymer for hybrid systems |
| Satyawati | Satcryl 360 | High solids for 2K cement systems |
🔹 Usage in Formulation
- Ratio (Part A : Part B) → typically 1 : 2
- Dosage in Part A: 40–45% polymer emulsion (balance: water + additives)
- Should allow good mixing with cement, silica, talc, and other fillers without coagulation.
Acronal® 5400 ap (from BASF) is an aqueous acrylic dispersion specifically designed for flexible cementitious waterproofing systems, particularly 2-component (2K) coatings.
✅ Suitability of Acronal® 5400 ap in Cementitious Waterproof Coatings
| Feature | Performance in Cementitious Systems |
|---|---|
| Type | Acrylic copolymer dispersion |
| Form | Milky white liquid, waterborne |
| Film Properties | Flexible, continuous, water-resistant film |
| Cement Compatibility | Excellent |
| Adhesion to Substrate | Strong on concrete, mortar, brick |
| Crack Bridging | Good (typically up to 1 mm) |
| UV Resistance | High – suitable for exposed areas |
| Water Permeability | Low – forms dense matrix with cement |
| Alkali Resistance | Stable in cementitious environment |
| Workability | Excellent brushability and pot life |
📌 Recommended Formulation Use
- Acronal® 5400 ap acts as Part A in 2K coatings.
- Mix with Part B: Cement (e.g., white or OPC 43), fine quartz powder, additives (e.g., cellulose thickener, anti-foaming agent).
- Typical polymer-to-cement ratio (by weight): 1:2 to 1:2.5
- Water may be added depending on viscosity requirement.
🛠️ Basic 2K Cementitious Waterproof Coating with Acronal® 5400 ap (Indicative)
| Component | Ingredients | Wt % (approx.) |
|---|---|---|
| Part A (Liquid) | Acronal® 5400 ap | 25–30% |
| Water | 5–10% | |
| Defoamer, preservative | <1% | |
| Part B (Powder) | White/OPC Cement | 35–40% |
| Quartz powder (125–200 mesh) | 15–20% | |
| Cellulose thickener | 0.3–0.5% | |
| Silica fume or metakaolin (optional) | 3–5% |
⚠️ Key Considerations
- pH stability: Acronal® 5400 ap is stable in high-alkaline environments typical of cement.
- Avoid over-dilution with water.
- Storage: Protect from frost; store at 5–35°C.
✅ Verdict:
Acronal® 5400 ap is highly suitable for use in flexible cementitious waterproof coatings. It offers excellent adhesion, UV stability, water resistance, and crack-bridging performance when formulated correctly.
Formulation Guidelines
For further details on formulations please contact Dr E. Ramanathan, WhatsApp 9444929163
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