What are redispersible polymer powders?
Brief introduction of redispersible polymer powder
Redispersible polymer powder is a free-flowing, white powder that can easily be redispersed in water to create a stable emulsion with excellent film-forming and adhesion properties. Redispersible polymer powder is commonly used in the construction industry for screeds, cement-based mortars and plasters.
Key properties of redispersible polymer powder
1. Excellent film-forming properties
RDP can form a strong and flexible film when applied to a surface, which makes redispersible polymer powder perfect for use in applications such as adhesives, coatings, and sealants.
2. Improved adhesion
RDP has improved adhesion properties, which means redispersible polymer powder can be used to improve the performance of various materials such as cement-based mortars and plasters.
3. Good water resistance
RDP exhibits good water resistance which makes redispersible polymer powder ideal for use in wet environments such as ponds, pools, and other water-retaining structures.
4. High elasticity
RDP has high elasticity which makes redispersible polymer powder ideal for use in applications where materials need to maintain their integrity even under the extreme stretching or bending.
5. Good workability
RDP has good workability which means redispersible polymer powder can be easily mixed and applied to surfaces, and can be easily adjusted to meet the specific needs of a particular application.
Application of redispersible polymer powder
-Dry mix mortars
-Tile adhesive
-Plasters
-Putties
-Cement renders
-Waterproofing
-Repair mortars
-Adhestion mortars
Benfit of redispersible polymer powder in mortar
1. Improved Adhesion
Redispersible polymer powder improve the adhesion of the mortar to the substrate, which enhances the durability and strength. This property is particularly important in bonding tiles, bricks, and stones.
2. Increased Flexibility
Redispersible polymer powder enhances the mortar’s flexibility, allowing it to resist cracking caused by movement and thermal stress. This property also makes it ideal for use on substrates that are susceptible to deflection.
3. Water Resistance
Redispersible polymer powder enhances the mortar’s water resistance, making it less prone to water penetration and corrosion.
4. High Workability
Redispersible polymer powder increases the mortar’s workability and spreadability, which makes it easier to apply and faster to install.
5. Higher Strength
Redispersible polymer powder improve the strength of the mortar, which enhances product performance and longevity.
History of redispersible polymer powder
Redispersible polymer powder (RDP) was first developed commercially in the early 1950s in Europe. The initial applications of RDP were in the field of construction, primarily used as a cement admixture to improve the properties of cement-based materials. With advances in technology and formulation, RDP’s use has expanded to other industries, including food, pharmaceuticals, and personal care products. RDP has continued to evolve, with new developments designed to improve its properties and enhance its versatility.
Production method of redispersible polymer powder
1. Preparation of the polymer
The polymer is prepared by emulsion polymerization, often using VAE copolymers, and various additives such as surfactants, protective colloids, and plasticizers.
2. Spray drying
The resulting polymer dispersion is then subjected to spray drying, where it is transformed into a powder form.
3. Post-treatment
The redispersible polymer powder can be further treated to improve its properties. The additional processing can involve several techniques such as granulation, homogenization, and spray coating.
4. Quality Control
Manufacturers test the product’s properties to ensure its quality.
RDP product of our factory and their application
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