Redispersible Polymer Powder

1. Product Description

Redispersible Polymer Powder (RDP) is a white or light-yellow free-flowing powder produced by spray-drying polymer emulsions such as ethylene-vinyl acetate (EVA), acrylic ester (PA), or styrene-butadiene (SBR). When mixed with water, it rapidly redisperses into a stable emulsion, imparting superior adhesion, flexibility, weather resistance, and crack resistance to building materials. As a core additive in modern eco-friendly construction products, RDP is widely used in dry-mix mortars, architectural coatings, repair materials, and more.

2. Specifications

3. Key Features

• Water Redispersibility: Rapidly disperses in water to form a stable emulsion, compatible with cement, gypsum, and other inorganic materials.

• High Adhesion: Enhances bonding strength between mortar and substrates, reducing delamination risks.

• Flexibility & Crack Resistance: Polymer films absorb stress, improving impact resistance and minimizing cracking.

• Durability: Resistant to water, freeze-thaw cycles, and UV degradation for indoor/outdoor applications.

• Eco-Friendly: Formaldehyde-free, heavy metal-free, compliant with GB 18582 and other environmental standards.

4. Advantages

• Ease of Use: Pre-mixed dry formulations reduce on-site errors and improve construction efficiency.

• Enhanced Performance: Extends mortar open time, improves sag resistance, and reduces shrinkage.

• Cost-Effective: Lowers transportation and storage costs compared to liquid emulsions, with a 12-month shelf life.

• Versatility: Compatible with diverse substrates (concrete, wood, EPS insulation boards, etc.).

5. Applications

• Dry-Mix Mortars: Tile adhesives, exterior insulation systems, self-leveling compounds, waterproofing mortars, plasters.

• Architectural Coatings: Waterproof coatings, decorative finishes.

• Repair Materials: Concrete crack repair agents, rapid-setting mortars.

• Gypsum Products: Reinforces gypsum board strength and water resistance.

• Other Fields: 3D-printed construction materials, floor coatings, fire-resistant coatings.

6. Production Technology

• Emulsion Polymerization: Synthesizes stable polymer emulsions via free-radical polymerization.

• Spray Drying: Emulsions are atomized and dried into powder under controlled conditions, retaining polymer reactivity.

• Surface Treatment: Anti-caking agents (e.g., silica) are added to improve powder flowability.

• Quality Control: Ensures batch consistency through laser particle analysis and DSC (Differential Scanning Calorimetry).

7. Theory (Mechanism of Action)

Upon redispersion in water and subsequent evaporation, RDP forms a continuous polymer film:

• Physical Reinforcement: Fills pores to enhance density and impermeability.

• Chemical Bonding: Polar groups interact with inorganic hydrates (e.g., C-S-H gel), forming an interpenetrating network.

• Stress Relief: Flexible polymer films absorb deformation stresses, inhibiting crack propagation.

8. Services

• Custom Solutions: Tailor glass transition temperature (Tg), particle size, and formulation compatibility.

• Technical Support: Formula optimization, application guidance, and sample testing.

• After-Sales Service: 24/7 response, quality traceability reports, and troubleshooting.

9. Packaging & Storage

• Packaging: 25 kg/bag (moisture-proof composite paper bag with PE liner), customizable upon request.

• Storage: Keep in a cool, dry place (<35℃), away from moisture. Shelf life: 12 months.

• Transportation: Protect from rain, humidity, and mechanical stress.

10. Precautions

• Safety Gear: Wear dust masks, goggles, and gloves to avoid skin/eye contact or dust inhalation.

• Spill Handling: Collect with dry tools; avoid water (prevents clumping).

• First Aid: Flush eyes with water for 15 minutes if exposed; move to fresh air if inhaled.

• Waste Disposal: Dispose according to local environmental regulations.