What are redispersible polymer powders? - Cellulose Ether

Redispersible polymer powders are easily dispersible polymer powders obtained through high-temperature and high-pressure spray-drying processes, resulting in thermoplastic resin materials. When these powders are mixed with water, they disperse, reverting to their original emulsion form with similar properties. This makes them highly valuable in construction applications, especially for enhancing the performance of dry-mix mortars.

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Advantages of Redispersible Polymer Powders

Enhanced Mortar Properties

The incorporation of redispersible polymer powders into mortar mixture significantly improves its cohesiveness, cohesion, and flexibility. This leads to better water retention within the mortar, reducing evaporation and increasing bond strength.

History and Evolution

Invented by German chemist Wacker Hemie in 1953, redispersible polymer powder has undergone many advancements. In the same year, the first practical batch was produced. Initially, vinyl acetate homopolymer powder was widely used, but it had limitations in alkaline systems. In 1960, ethylene-vinyl acetate (EVA) copolymer powder was introduced, which addressed these limitations by improving flexibility and alkali resistance, making it suitable for use with Portland cement.

Chemical Properties and Performance

CAS: 24937-78-8

• Appearance: White or light yellow powder
• Solid Content: ≥98.0%
• Ash Content: Ranges between 10-20%
• Bulk Density: 500-600 g/l
• Particle Size: ~80 µm
• PH Value: 5.0-8.0
• Minimum film-forming temperature: 0°C
• Tg: Ranges from -10°C to 16°C

Applications of Redispersible Polymer Powders

Improving Adhesion

Redispersible polymer powders enhance adhesion in various substrates, such as EPS boards, concrete, and brick walls, ensuring weather-resistant bond strength.

Flexibility and Elasticity

These powders decrease the elastic modulus of materials, enhancing elasticity and enabling the material to withstand substrate deformation, external forces, temperature variations, and freeze-thaw cycles.

Water Resistance

The hydrophobic properties of certain redispersible polymer powders reduce water absorption, minimizing water damage in molded mortar.

Improved Construction Performance

Specific types of redispersible polymer powders enhance the sag resistance and fluidity of mortar, improving its workability and ease of application.

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