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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In recent developments, a report published on October 5th, 2023, highlights an emerging trend in the use of redispersible polymer powders in sustainable construction materials. This trend aligns with the growing emphasis on environmental responsibility within the construction industry. The report emphasizes that redispersible polymer powders are now being integrated with eco-friendly additives to enhance the green credentials of modern construction materials.

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 powders (RDPs) have become an important part of modern building materials. Its unique properties make it an ideal ingredient for a wide range of applications. From improved processability of building materials to high adhesive properties, RDP has revolutionized the field of construction.

Here are some typical applications of RDP:

1. Exterior Insulation and Finishing System (EIFS)

EIFS is a popular method of covering exterior walls with weather resistant insulation. One of the main components of EIFS is RDP. It contributes to the strength, adhesion and flexibility of EIFS, ensuring it can withstand varying weather conditions.

2. Tile Adhesive

Tile adhesives are widely used in interior and exterior tile applications. RDP is used to enhance the performance of these adhesives by increasing bond strength, flexibility and water resistance. This ensures that the tiles will stay in place even under heavy loads or changing weather conditions.

3. Self-leveling floor compound

Self-leveling floor compound is used to create a smooth, level surface on concrete floors. Adding RDP to these compounds improves the adhesion, processability and flow of the mixture. This ensures a flat, level and durable floor.

4. Mortar and plaster

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Mortar and plaster are used to bond brick, stone and concrete blocks together and to create a smooth finish on walls. RDP is an important part of these blends as it improves their water resistance, adhesive properties and flexibility. This means mortars and plasters can withstand different weather conditions and remain strong over time.

5. Gypsum board joint compound

Drywall joint compound is used to fill gaps and joints between drywall. Adding RDP to these compounds improves processability, adhesion and durability. This ensures that the joint compound remains strong, crack resistant and easy to apply.

6. Waterproof membrane

Waterproofing membranes are used to prevent water from penetrating buildings. RDP has been added to these membranes to enhance their flexibility and adhesion, ensuring they can withstand varying weather conditions and remain strong over time.

7. Plastering

Plastering is the process of applying a layer of plaster to walls and ceilings. RDP is used to improve the adhesion and workability of the stucco, ensuring that it will apply smoothly and evenly.

8. Textured coating

Textured paints are used to create decorative effects on exterior walls. RDP is used to increase the bond strength and durability of these coatings, ensuring they can withstand varying weather conditions and remain attractive over time.

RDP has become an indispensable part of modern building materials due to its unique properties. Its use has revolutionized the field of construction, making it possible to manufacture high-quality materials with enhanced performance characteristics. Whether it is EIFS, tile adhesives, self-leveling floor compounds, mortars and plasters, plasterboard joint compounds, waterproofing membranes, plasters or texture coatings, RDP has proven to be a versatile and reliable ingredient.

Rio Lee International marketing devision Anxin Cellulose Co.,Ltd

Anxin Cellulose Co.,Ltd

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