What is the function of redispersible polymer powder?

Redispersible polymer powders are free-flowing, white powders manufactured by spray-drying polymer dispersions. When added to water, these polymer powders can disintegrate and form individual polymer dispersions again, with identical 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.

RDP Production Process

The redispersible polymer powder is a latex emulsion created by spray-drying macromolecular dispersions under particular conditions. During production, polyvinyl alcohol is added to stop the latex particles bonding together. These polymer powders are usually manufactured based on acrylic polymers, polyvinyl acetate, copolymers of vinyl acetate with vinyl versatate or with ethylene.
RDPs comprise of polymer resin, the crucial ingredient of dispersion particles and an important player for redispersible powders to function. As an additive, polymer powders act as modified resin and polymer resin.

Properties of Redispersible Polymer Powders

When water is added to the dry mix mortar, the polymer powder becomes a dispersion and forms a film upon drying. This film promotes elasticity and adhesion. Redispersible polymer powders are classified into highly elastic with low adhesion, rigid with high adhesion, and medium elastic with standard adhesion. Water is added to some powders to impart hydrophobic characteristics to the material.

• Vinyl Acetate-Ethylene Polymers (VAE) – These powders blend the flexibility of ethylene and the adhesion of vinyl acetate, leading to many economic and ecological benefits without affecting performance.
  They offer several benefits, including excellent cohesion, flexibility, good low-temperature film and variable glass transition temperature. They also show great adhesion to certain substrates like plastics and wood.
• Vinyl Chloride Copolymers and Terpolymers – These polymer powders show great water resistance, high hydrophobicity, and excellent tensile adhesion.
• Terpolymers based on VEOVA and VAcE – These polymer powders have extremely low transition temperatures. The benefits of using polymer powders based on VEOVA and VAcE include good workability, non-slump behaviour, good tensile adhesion strength, excellent crack-bridging properties, and low stickiness.

Applications

Redispersible polymer powders have numerous applications across various industries. They are widely used in:

• Construction adhesives
• Tile adhesives
• Joint mortars
• External wall putty
• Building binders
• Filling compositions like concrete repair joints, crack isolation membranes, and waterproofing membrane applications.

Interested in RDP Powders Products? Contact Bisley & Company

Bisley offers a variety of RDP polymer products that can help improve abrasion resistance, flexural strength, gas migration, and workability properties of the mixed mortar. These polymer powders are easily dissolved in water and develop stable emulsions.

Please send us a message online to learn more about the available specifications, grades, packaging, and applications of polymer powders. Our team will help you find an RDP powder product that suits your application.

Redispersible Polymer powder (ordinary type) is composed of special polymers made of powder adhesive after spray drying. This powder in contact with water can be dispersed again into soon after forming emulsion, and with the nature of the same as the initial emulsion, namely the film can be formed after the moisture evaporation, the film has high flexibility, high resistance to weathering and on various substrate with high caking property. the powder environmental protection, energy saving, high quality, used for powder materials, dry-mix mortar is an indispensable functional additive. It can improve the performance of mortar, raise the strength of the mortar, improve the bonding strength of mortar with different base material, improve the mortar flexible and variable line, compressive strength, flexural strength, abrasion resistance and toughness, stick relay and water retention, constructability.

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..

Feature: Redispersible Polymer powder (Redispersible Latex powder) is the main raw material in the production of internal, and external wall putty, adhesive mortar and plaster mortar. The powder is specially applied as the agglutinant of basis materials on triple superphosphate, talcum powder and white cement and so on. It can improve the adhesion properties of water resistance, flexural strength, and operability of the basis materials.

Usage: The quantity of the powder varies according to different kinds of base material. The substrate mixture should be stirred and dispersed fully to ensure the excellent stability of the products. However, high temperature generated from high pressure and shear stress when mixing should be avoided.

Attentions: Store in a cool and dry place. Please use within the guarantee period. To avoid metamorphism caused by absorbing ambient moisture, as possible one-time use after the bag is opened.

Product elucidation

Redispersible Polymer powder is mainly applied to the dry mixed mortar of the construction industry, and is the important additive of dry mixed mortar.

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Redispersible Polymer powder has obvious functions in the dry mixed mortar. It can improve strength and bonding force, the elastic bending strength and rupture strength of materials. It also improves the freezeproof property, weathering resistance, durability and wear resistance of the materials. As well as intensify the hydrophobicity and reduce water absorption, improve the construction characteristic and reduce the contraction ratio of materials. The powder can efficiently prevent cracking.

1. Improvement of the bonding strength and bonding force.

It is quite necessary to add Redispersible Polymer powder to the products of dry mortar. It can obviously improve the bonding strength and bonding force of materials, as it is because the matrix hole and capillary penetration of the polymer particle to cements form into fine bonding strength after hydrating of the cements. Furthermore, due to the fine bonding force of polymer resin, the powder has better effects on the improvement of the bonding force of dry mortar to the base materials, especially improving the bad bonding properties of the inorganic bonder such as cement to the organic materials like woods, fiber, PVC and EPS.

2. Improvement of the counter bending and tensile property.

In the rigid structures after hydrating of the cement mortar, the film elasticity and tenacity of the polymer have a similar function of the mobile joint between the cement mortar particles. Thus, it can bear high distortion load and reduce the stress, as well as improve the tension and resistance to bending.

3. Improvement of the impact resistance

Redispersible Polymer powder is a thermoplastic resin. The soft covering on the surface of mortar particles can absorb external force impact that is tensile without damage, so as to improve the impact resistance of mortar.

4. Improvement of the hydrophobicity and reduction of the water absorption

Addition of the Redispersible Polymer powder can improve the microscopic structure of the cement mortar. The polymer forms an irreversible network during the cement hydration process. Capillary in the close cement gelation can hold up the water absorption and water penetration, so as to improve the penetration resistance capability.

5. Improvement of the wear resistance and durability

Addition of the Redispersible Polymer powder can intensify the dense grade between the cement mortar particles and polymer film. Strengthening of the bonding force correspondingly improves the shearing stress-bearing capacity of the mortar, reduces the wear rate, improves wear resistance, and prolongs the service life of the mortar.

6. Improvement of the freeze-thawing stability and efficient prevention of the cracking of materials

The plasticity function possessed by the thermoplastic resin of Redispersible Polymer powder can overcome the flatulence damage for cement mortar materials brought by temperature difference changes. It can overcome the defects of dry shrinkage and distortion of single cement mortar that is easy to be cracked, and make the material flexible, so as to improve the stability of the materials.

If you are looking for more details, kindly visit Redispersible Polymer Powder Manufacturer.