Redispersible polymer powder is a spray-dried powder of polymer emulsion basing onethylene-vinyl acetate copolymer. It is an important material in modern drymix mortar. What effects does theredispersible polymer powderhave on the building mortar?
The redispersible polymer powder particles fill the cavity of the mortar, the density of the mortar is increased, and the wear resistance is improved. Under the action of external force, it will produce relaxation without being destroyed. The polymer film can be permanently preserved in the mortar system.
1. Improve the workability of mortar construction
After the redispersible latex powder as an organic binder is formed into a film, it can form high tensile strength and cohesive strength on different substrates. Plays an important role in the adhesion of mortar to organic materials (EPS, extruded foam board) and smooth surface substrates. The film-forming polymer powder is distributed throughout the mortar system as a reinforcing material to increase the cohesion of the mortar.
2. Improve the weather resistance, freeze-thaw resistance and crack resistance of mortar
Redispersible polymer powder is a thermoplastic resin with good flexibility, which can make the mortar cope with the change of external cold and hot environment, and effectively prevent the mortar from cracking due to the change of temperature difference.
3. Improve the hydrophobicity of mortar and reduce water absorption
The redispersible polymer powder forms a film in the cavity and surface of the mortar, and the polymer film will not disperse again after being exposed to water, which prevents the intrusion of water and improves the impermeability. Specialredispersible latex powderwith hydrophobic effect has better hydrophobic effect.
4. Improve the bending strength and flexural strength of mortar
The polymer film formed by redispersible polymer powder has good flexibility. Films are formed in the gaps and surfaces of cement mortar particles to form flexible connections. Thus, the brittle and hard cement mortar becomes elastic. The mortar with added amount of redispersible polymer powder is several times higher than ordinary mortar in terms of tensile and bending resistance.
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Post time: Jul-25-2023