redispersible latex powder RDP for tile adhesivesDecember 7th 2023
Redispersible polymer powders are spray-dried emulsions that, when mixed with water or water in a mortar, form the same stable dispersion as the original emulsion. The characteristic of redispersible polymer powder is that this powder can only be dispersed once, and it will not be dispersed again when the mortar becomes wet again after hardening. The invention of redispersible polymer powders made dry powder mortars significantly superior to traditional mortars. In the bonding mortar for decorative panels, the amount of redispersible polymer powder is more required. Its addition improves the flexural strength, crack resistance, adhesion strength, elasticity and toughness of the mortar. To avoid shrinkage cracking of the mortar, it can also reduce the thickness of the bonding layer. The redispersible polymer powder can improve the above properties of mortar because it can form a polymer film on the surface of the mortar particles. There are pores on the surface of the film, and the surface of the pores is filled with mortar, which reduces the stress concentration and reduces the external force. Under the action ,it will produce relaxation without damage. In addition, the mortar forms a rigid skeleton after cement hydration, and the film formed by the polymer can improve the elasticity and toughness of the rigid skeleton, and the redispersible polymer powder can also improve the tensile strength of the mortar. The bonding strength and consistency of the tile adhesive can be found that as the amount of rubber powder increases, the bonding strength of the adhesive also increases.
Incorporating the redispersible polymer powder can significantly improve the inherent flexibility and deformation resistance of the material, so it contributes to the flexural strength and bonding strength of the material.