What are redispersible polymer powders? - Cellulose Ether

Redispersible polymer powders are polymer emulsions which have been converted by a series of process such as high temperatures and pressures, spray drying and surface treatment to powdered thermoplastic resin materials. When mixed with water, these powdered organic binders can redisperse in water back into new emulsions with essentially identical properties to the original copolymer emulsions.

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The addition of redispersible polymer powders into mortar can increase the cohesiveness, cohesion and flexibility of mortar. First, it can improve the water retention of mortar and form a film to reduce evaporation of water. Second, it can improve the bond strength of mortar.

The redispersible polymer powder was invented by a German named Wacker Hemie in 1953, which makes it possible to produce polymer modified dry-mix mortar. The history of redispersible polymer powder is only over 50 years up to now. In 1953, the world’s first batch of practical redispersible powder was invented in Germany. With continuous innovation and progress in the production technique of subsequent products, it has achieved a series of results and developed a series of products by in combination with subsequent applications.

The world’s first kind of redispersible polymer powder is vinyl acetate homopolymer powder. But this kind of polymer powder can only be used in non-alkaline systems, since esters or polymers with ester bonds react to form free alcohols or acid salts in alkaline conditions, thus bringing about sudden changes in the performance, from non-water-soluble into water-soluble, and that the increase in the glass-transition temperature will lose the required flexibility, or for other reasons. In 1960, the ethylene-vinyl acetate copolymer powder (EVA) was successfully produced, which mainly uses ethylene, the unsaponifiable organic monomer, for internal plasticization on the redispersible polymer powder and to significantly improve the flexibility of polymer powder. Polymer powder of this kind can be used for the alkaline system of Portland cement.

Redispersible Polymer Powder

CAS:24937-78-8

 

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Redispersible Polymer Powder is the most important binder in cement-based, gypsum-based dry powder materials. Redispersible Polymer Powder is a spray-dried powder of polymer emulsion. Redispersible Polymer Powder is re-emulsified with water and has the same properties as the original emulsion, that is a film can be formed after water evaporation. This film has high toughness, weather resistance and adhesion to a substrate. In addition, the latex powder with hydrophobic properties can improve the waterproof performance of the waterproof mortar.

Item 8011 8012 8013 8513 8044 Appearance White or light yellow powder，free-flowing Solid Content ≥98.0% Ash Content 20%±2 15%±2 12%±2 12%±2 10%±2 Bulk Density 500−600 g/l 500−600 g/l 500−600 g/l 500−600 g/l 500−600 g/l Particle Size ~80 μm ~80 μm ~80 μm ~80 μm ~80 μm PH Value 5.0-8.0 5.0-8.0 5.0-8.0 5.0-8.0 5.0-8.0 Minimum film-forming

temperature

0℃ 0℃ 0℃ 0℃ 0℃ Tg 16℃ 3℃ – 8℃ 3℃ -10℃ Hydrophobicity / / / yes /

Performance of Redispersible Polymer Powder in dry mortar:

1. Improve the adhesion of dry mortar to various substrates and ensure the weather resistance of mortar bond strength under various conditions of use. For example, to improve the bond strength between mortar and EPS board, EPS particles, concrete walls and brick walls in the thermal mortar;
2. Reduce the elastic modulus of the materials, improve the elasticity and flexibility of the materials. The material can withstand certain substrate deformation, external force impact, temperature difference deformation, and freeze-thaw deformation. If Redispersible Polymer Powder can significantly improve the dynamic anti-cracking of the putty and the heat aging resistance of the tile adhesive, the impact resistance of the EPS board insulation system;
3. Redispersible Polymer Powder can reduce the water absorption of the material, the special hydrophobic latex powder effect is more obvious. Reduce water and damage caused by water to the molded mortar;
4. Some types of Redispersible Polymer Powder can improve the sag resistance and fluidity of the mortar, in order to improve the construction performance of the mortar.

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