Redispersible polymer powder can be quickly redispersed into emulsion after contact with water, and has the same properties as the initial emulsion, that is, it can form a film after the water evaporates. This film has high flexibility, high weather resistance and high adhesion to various substrates. In addition, hydrophobic polymer powder can make mortar have good waterproof properties.
Redispersible latex powder is mainly used in:
Interior and exterior wall putty powder, tile adhesive, tile grout, dry powder interface agent, exterior wall insulation mortar, self-leveling mortar, repair mortar, decorative mortar, waterproof mortar and exterior insulation dry-mixed mortar. In mortar, the purpose is to improve the brittleness and high elastic modulus of traditional cement mortar, give cement mortar better flexibility and tensile bonding strength, so as to resist and delay the generation of cement mortar cracks. Since the polymer and mortar form an interpenetrating network structure, a continuous polymer film is formed in the pores, which strengthens the bonding between aggregates and blocks some pores in the mortar. Therefore, the performance of the hardened modified mortar is greatly improved compared with that of cement mortar.
The role of redispersible polymer powder in mortar is mainly in the following aspects:
Improve the compressive strength and flexural strength of mortar.
The addition of latex powder increases the elongation of the mortar, thereby improving the impact toughness of the mortar, and also gives the mortar a good stress dispersion effect.
Improves the bonding performance of mortar. The bonding mechanism relies on the adsorption and diffusion of macromolecules on the adhesive surface. At the same time, the glue powder has a certain permeability, and together with the cellulose ether, it fully infiltrates the surface of the base material, making the base material and the surface performance of the new plaster close, thereby improving the adsorption and greatly increasing its performance.
Post time: Jan-21-2025