Redispersible polymer powders are white, free-flowing powders produced by spray-drying polymer dispersions. When these polymer powders are mixed with water, they can re-disperse and form polymer dispersions with the same properties as the original dispersion.

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Redispersible polymer powders are added to mortar to increase the flexibility and cohesiveness of mortar. This forms a continuous polymer film that helps improve water retention, enhance the bond strength of mortar, and improve the workability of dry mix mortar.

Production Process of Redispersible Polymer Powder (RDP)

Redispersible polymer powder is produced from latex emulsions through a process of spray-drying macromolecular dispersions under specific conditions. To prevent the latex particles from bonding together during production, polyvinyl alcohol is added. These polymer powders are typically based on acrylic polymers, polyvinyl acetate, copolymers of vinyl acetate with vinyl versatate, or with ethylene.

RDPs consist of polymer resin, which is the main component of dispersion particles and plays a crucial role in the functionality of redispersible powders. Acting as a modified resin and polymer resin, polymer powders serve as additives in various applications.

Properties of Redispersible Polymer Powders

When water is added to dry mix mortar, the polymer powder forms a dispersion and creates a film upon drying. This film enhances elasticity and adhesion. Redispersible polymer powders are categorized based on their elasticity and adhesion properties, including highly elastic with low adhesion, rigid with high adhesion, and medium elastic with standard adhesion. Some powders have water added to impart hydrophobic characteristics to the material.

Vinyl Acetate-Ethylene Polymers (VAE): These powders combine the flexibility of ethylene with the adhesion of vinyl acetate, offering numerous economic and ecological benefits without compromising performance. They provide excellent cohesion, flexibility, low-temperature film formation, and variable glass transition temperature. Additionally, they exhibit strong adhesion to various substrates such as plastics and wood.

Vinyl Chloride Copolymers and Terpolymers: These polymer powders demonstrate high water resistance, hydrophobicity, and tensile adhesion. They are particularly effective in applications where water resistance is crucial, offering superior performance in challenging environments.

Terpolymers based on VEOVA and VAcE: These polymer powders have remarkably low transition temperatures. They offer advantages such as good workability, non-slump behavior, strong tensile adhesion strength, excellent crack-bridging properties, and minimal stickiness.

Applications of Redispersible Polymer Powders

Redispersible Polymer powder is mainly used in all kinds of dry-mix mortar, such as wall putty powder, ceramic tile adhesive, ceramic tile jointing agent, dry powder interface agent, exterior insulation mortar, self-leveling mortar, mending mortar, decorative mortar, waterproof mortar, etc.

Redispersible polymer powders find extensive applications across various industries, including:

1. Construction adhesives

2. Tile adhesives

3. Joint mortars

4. External wall putty

5. Building binders

6. Filling compositions, such as concrete repair joints, crack isolation membranes, and waterproofing membrane applications.

Interested in RDP Powder Products? Contact SLEO

SLEO offers a range of RDP polymer products designed to enhance abrasion resistance, flexural strength, gas migration, and workability properties of mixed mortar. These polymer powders dissolve easily in water and form stable emulsions.

If you are looking for more details, kindly visit Self-Leveling Compound Manufacturer.

Send us a message online to discover more about the available specifications, grades, packaging options, and applications of our polymer powders. Our team will assist you in finding an RDP powder product that meets your specific requirements.

What is redispersible polymer powder?

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Redispersible polymer powders are polymer emulsions that have been transformed into powdered thermoplastic resin materials through a series of processes including high temperature and pressure, spray drying, and surface treatment. When mixed with water, these powdered organic binders can be redispersed in water to form new emulsions with essentially the same properties as the original copolymer emulsions.

The addition of redispersible polymer powder to mortar can improve the cohesion, cohesion and flexibility of mortar. First, it can improve the water retention of mortar, form a film and reduce water evaporation. Secondly, it can improve the bond strength of mortar.

Redispersible polymer powder was invented by German Wacker Hemie in 1953, making it possible to produce polymer-modified dry-mixed mortar. The history of dispersible polymer powder is only 50 years old so far. 1953, the first practical dispersible powder in the world was invented in Germany. With the continuous innovation and progress in the production process of subsequent products, a series of results have been achieved and a series of products have been developed in conjunction with subsequent applications.

The first redispersible polymer powder in the world was vinyl acetate homopolymer powder. However, this polymer powder can only be used in non-alkaline systems, because esters or polymers with ester bonds react under alkaline conditions to generate free alcohols or salts, resulting in sudden changes in performance from insoluble to water-soluble, and an increase in glass transition temperature will lose the desired flexibility, or for other reasons. 1960 successfully produced ethylene vinyl acetate copolymer powder (EVA), mainly The internal plasticization of the redispersible polymer powder using the unsaponifiable organic monomer ethylene significantly improves the flexibility of the polymer powder. This polymer powder can be used in alkaline systems of silicate cements.

Advantages of dispersible polymer powders

▲Used as a self-leveling smoothing compound and flooring compound.

▲Provide excellent water repellency and hydrophobic properties.

▲Provide proper adhesion for exterior insulation and finishing systems.

▲Provide excellent slip resistance, impact resistance, and helps reduce the formation of cracks caused by shrinkage.

▲Improve adhesion, flexural strength, plasticity, abrasion resistance and good workability of modified compounds.

▲Improve processability and other important mechanical properties such as tensile, compressive and flexural strengths, and lateral deformation.

Redispersible polymer powder applications

▲Cement rendering

▲Restoration mortars

▲Wallpaper adhesives

▲Cement-based wall putty

▲Crack filler

▲Gypsum joint filler

▲Bonding mortar

▲Cement-based tile adhesive

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