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Redispersible polymer powder is a powdered material made from polymer emulsions through spray drying, and it is widely used in dry-mixed mortars. When mixed with water, it can redisperse into an emulsion, forming a continuous polymer film as the water evaporates. This has a multifaceted positive impact on the physical and mechanical properties of the mortar, significantly improving its various performance characteristics. The following are the main functions of redispersible polymer powder in mortar:

1. Improves mortar compressive and flexural strength: The addition of redispersible polymer (RDP) increases the elongation of the mortar, thereby mproving its impact toughness. It also provides good stress dispersion, further enhancing its compressive and flexural strength.
2. Improves mortar adhesion: As an organic binder, RDP forms a film with high tensile and adhesive strength on various substrates. Through the adsorption and diffusion of macromolecules on the adhesive surface, and the permeability of the powder, it fully wets the surface of the base material, making the surface properties of the base material similar to that of the newly plastered surface, thus improving adsorption and adhesion.
3. Reduces mortar’s elastic modulus, increases deformation capacity, and reduces cracking: RDP reduces the elastic modulus of the mortar, increasing its deformation capacity and reducing cracking.
4. Improves mortar’s abrasion resistance: The RDP particles fill the pores of the mortar, increasing its density and improving its abrasion resistance. The membrane structure formed by the adhesive powder can penetrate the pores and cracks in the cement mortar, improving the adhesion between the base material and the cement hydration products, thereby enhancing wear resistance.
5. Imparts excellent alkali resistance to mortar: Redispersible Polymer powder imparts excellent alkali resistance to mortar, allowing it to maintain good performance in alkaline environment.
6. Improves the impact resistance and durability of mortar: Redispersible polymer powder improves the impact resistance and durability of mortar, enabling it to relax without being destroyed under external forces, transforming it into a composite material with higher toughness and adaptability.
7. Improves the aging resistance and freeze-thaw cycle resistance of mortar, preventing cracking of cement mortar: Redispersible polymerpowder is a thermoplastic resin with good flexibility, allowing mortar to withstand damage from external hot and cold environments, effectively preventing cracks caused by temperature changes.
8. Increase the hydrophobicity of mortar and reduce the moisture content: the redispersible latex powder breaks down in the cement mortar cavity and surface layer, and the polymer paper is not easily redispersed after water treatment, thus blocking water intrusion and improving the impermeability.

In summary, redispersible polymer powder plays a multifaceted role in mortar, significantly improving its physical and mechanical properties, durability, and applicability.