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Waterborne polyurethane dispersion offering excellent film clarity and gloss retention.
Low VOC formulation compliant with stringent environmental regulations for architectural and industrial coatings.
Superior flexibility and abrasion resistance, even at low film thicknesses.
Good compatibility with acrylic emulsions and crosslinkers for hybrid coating systems.
Stable rheology profile enabling easy incorporation into water-based formulations without excessive thickener demand.
High-performance waterborne wood coatings for furniture and flooring.
Industrial maintenance coatings for metal substrates requiring durability and corrosion resistance.
Leather finishing topcoats demanding soft touch and hydrolytic stability.
Plastic and composite coatings requiring adhesion and flexibility on low-surface-energy substrates.
Architectural interior wall coatings requiring scrub resistance and low odor.
| Chemical Type | Aliphatic waterborne polyurethane dispersion |
| Product Form | Liquid dispersion |
| Appearance | Opaque white to slightly bluish liquid |
| pH (25 °C) | 7.5 – 8.5 |
| Solids Content (wt%) | 39 – 41 |
| Viscosity (mPa·s, Brookfield RVT, #2 spindle, 20 rpm) | 50 – 150 |
| Density (g/cm³, 20 °C) | 1.01 – 1.03 |
| Minimum Film Formation Temperature (MFFT) | ≈ 10 °C |
Q1: What is the primary function of DAOTAN STW 6434/40WA in polyurethane coating systems?
A: DAOTAN STW 6434/40WA is a waterborne polyurethane dispersion designed to enhance film formation, flexibility, and mechanical durability in low-VOC, high-performance coatings—particularly for industrial wood, plastic, and metal substrates where balanced hardness and impact resistance are required.
Q2: Is DAOTAN STW 6434/40WA compatible with common crosslinkers used in waterborne PU systems?
A: Yes, it is formulated for compatibility with standard aqueous crosslinkers such as aziridine, carbodiimide, and blocked isocyanate types. Compatibility and reaction kinetics should be verified during formulation development, especially when targeting specific cure schedules or performance requirements.
Q3: How does DAOTAN STW 6434/40WA perform under humid curing conditions?
A: As a waterborne polyurethane dispersion, it exhibits good coalescence and film formation at moderate humidity levels (40–70% RH). Very high humidity (>85% RH) may prolong drying time and affect early-stage film integrity; therefore, controlled ambient conditions are recommended during application and initial cure.
Q4: Can DAOTAN STW 6434/40WA be blended with acrylic dispersions or other waterborne resins?
A: It is generally compatible with many acrylic and hybrid dispersions, enabling formulators to tailor properties such as gloss, scrub resistance, and cost-performance balance. However, physical stability and long-term storage compatibility must be confirmed through laboratory testing before full-scale blending.
Q5: What safety and handling precautions should be observed when working with this resin?
A: While DAOTAN STW 6434/40WA is water-based and contains no organic solvents, standard industrial hygiene practices apply—including adequate ventilation, avoidance of prolonged skin contact, and use of appropriate personal protective equipment (e.g., nitrile gloves, safety glasses) during handling and formulation.
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E-mail: wangxingqiang@ericwchem.com
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