VINYL ACETATE-ETHYLENE REDISPERSIBLE POWDER
Paint chemicals 2025-03-21
After spray drying, VAE emulsion is turned into a white powder which is a copolymer of ethyl and vinyl acetate. It is free-flowing and is easy to emulsify. When dispersed in water, it forms a stable emulsion. Possessing the typical characteristics of VAE emulsion, this free-flowing powder offers greater convenience in handling and storage. It can be used by mixing with other powder-like materials, such as cement, sand and other lightweight aggregate, and it can also be used as a binder in building materials and adhesives.
Vinyl Acetate-Ethylene Redispersible Powder (VAE RDP): Properties and Applications
Table 1: Key Characteristics of VAE Redispersible Powder
| Property | Specification | Significance |
|---|---|---|
| Chemical Base | Vinyl acetate-ethylene copolymer | Determines flexibility and adhesion |
| Solid Content | 98-99.5% | Ensures high active material |
| Ash Content | 10-15% | Influences mineral compatibility |
| Particle Size | 50-150 μm | Affects redispersion and workability |
| Minimum Film Forming Temp. (MFFT) | 0-5°C | Critical for low-temperature applications |
| pH Value | 6.5-8.5 | Ensures compatibility with cement |
Table 2: Comparison with Other Polymer Powders
| Parameter | VAE RDP | Acrylic RDP | SBR RDP |
|---|---|---|---|
| Flexibility | High | Medium | Low |
| Water Resistance | Good | Excellent | Very Good |
| Adhesion to Substrates | Excellent | Good | Fair |
| Alkali Resistance | Good | Excellent | Excellent |
| Cost Efficiency | High | Medium | Low |
Table 3: Major Applications and Benefits
| Application | Function | Key Benefit |
|---|---|---|
| Cement Mortars | Polymer modification | Improved flexibility and adhesion |
| Tile Adhesives | Enhanced bonding | Reduced shrinkage and cracking |
| Exterior Insulation | Weatherproofing | Increased durability |
| Self-Leveling Compounds | Flow improvement | Better workability |
| Gypsum Products | Strength enhancer | Reduced brittleness |
Table 4: Recommended Dosage Guidelines
| Application | Dosage (% by weight) | Effect Achieved |
|---|---|---|
| Tile Adhesive | 1.5-3.0% | Improved bond strength |
| Exterior Render | 2.0-4.0% | Enhanced crack resistance |
| Repair Mortar | 3.0-5.0% | Higher flexural strength |
| Grouts | 1.0-2.5% | Better abrasion resistance |
| Floor Screeds | 1.5-3.5% | Reduced shrinkage |
Table 5: Technical Performance Data
| Test Parameter | Standard Mortar | VAE-Modified Mortar | Improvement |
|---|---|---|---|
| Flexural Strength (MPa) | 5-7 | 8-12 | +40-70% |
| Compressive Strength (MPa) | 25-30 | 20-25 | -10-15% |
| Adhesion Strength (MPa) | 0.5-1.0 | 1.5-2.5 | +150-200% |
| Water Absorption (%) | 10-15 | 5-8 | -40-50% |
| Elongation at Break (%) | 0.01-0.02 | 0.05-0.15 | +400-700% |
VAE redispersible powder significantly enhances the performance of cementitious materials by improving flexibility, adhesion and water resistance while maintaining good workability. Its balance of properties makes it particularly valuable for tile adhesives and exterior finishing systems where durability and bond strength are critical. The slight reduction in compressive strength is typically offset by substantial improvements in other performance parameters.
