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Redispersible Polymer powder(RDP) can Improve the consistency and slipperiness of the system in the wet mixing state. Due to the characteristics of the polymer, the cohesion of the wet mixing material is greatly improved, which contributes greatly to the workability; after drying, it provides adhesion to the smooth and dense surface layer. Relay, improve the interface effect of sand, gravel, and pores. Under the premise of ensuring the amount of addition, it can be enriched into a film at the interface, so that the tile adhesive has a certain flexibility, reduces the elastic modulus, and absorbs the thermal deformation stress to a large extent. In the later stage, in case of water immersion, there will be stresses such as water resistance, buffer temperature, and inconsistent material deformation, so as to improve weather resistance. Hydroxypropyl Methyl Cellulose , which provides good water retention and workability for fresh mortar, especially has a key role in the wetted area. In order to ensure the smooth progress of the hydration reaction, it can prevent the substrate from excessive water absorption and the surface layer from evaporating. Due to its air-entraining property, the bulk density of tile adhesive is reduced, material is saved and the modulus of elasticity of the hardened mortar is reduced.
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