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.
Tile adhesive Redispersible Polymer powder is a green, environmentally, friendly, building energy-saving, high-quality multi-purpose powder building material, and is an essential and important functional additive for dry-mixed mortar. It can improve the performance of mortar, increase the strength of mortar, increase the bonding strength between mortar and various substrates, improve the flexibility and workability, compressive strength, flexural strength, wear resistance, toughness, and viscosity of mortar. Relay and water retention capacity, constructability. The performance of the tile adhesive Redispersible Polymer powder is relatively strong, and has high bonding ability and unique properties. Therefore, their range of application is extremely wide.Hydroxypropyl Methylcellulose plays the role of water retention, thickening and construction performance in the early stage, and Redispersible Polymer powder of tile adhesive plays the role of strength in the later stage, which plays a very good role in the firmness, acid and alkali resistance of the project. Effect of tile adhesive Redispersible Polymer powder on fresh mortar: prolong working time and adjustable time Improve water retention performance to ensure cement hydration Improve sag resistance Improve workability Effect on hardened mortar and various substrates It has good adhesion, including concrete, plaster, wood, old tiles, and PVC, and has good deformation ability under various climatic conditions.
The addition of Redispersible Polymer powder for tile adhesives has a very obvious effect on the improvement of the performance of cement-based tile adhesives, and has a significant effect on the bonding strength, water resistance, and aging resistance of the adhesive. At present, there are many types of Redispersible Polymer powders for tile adhesives on the market, such as acrylic Redispersible Polymer powders, styrene-acrylic powders, vinyl acetate-ethylene copolymers, etc. Generally speaking, tile adhesives used in tile adhesives on the market Most Redispersible Polymer powders are vinyl acetate-ethylene copolymers.
(1) As the amount of cement increases, the original strength of the Redispersible Polymer powder for tile adhesive increases, and at the same time, the tensile adhesive strength after immersion in water and the tensile adhesive strength after heat aging also increase. Considering that the properties of the tile adhesive Redispersible Polymer powder meet the standard requirements, the amount of cement should be more than 35%.
(2) With the increase of the amount of Redispersible Polymer powder for tile adhesive, the tensile bond strength of the Redispersible Polymer powder for tile adhesive after immersion in water and the tensile bond strength after heat aging increased accordingly, but the thermal aging After that, the tensile bond strength increased significantly.
Due to its good decorative and functional features such as durability, water resistance and easy cleaning, ceramic tiles are widely used: including walls, floors, ceilings and swimming pools, etc., and can be used both indoors and outdoors. The traditional pasting method of tiles is the thick-layer construction method, that is, first apply ordinary mortar to the back of the tiles, and then press the tiles to the base layer. The thickness of the mortar layer is about 10 to 30mm. Although this method is very suitable for construction on uneven bases, the disadvantages are low efficiency of tiling tiles, high requirements for workers' technical proficiency, increased risk of falling off due to poor flexibility of mortar, and difficulty in correcting mortar on the construction site. Quality is strictly controlled. This method is only suitable for tiles with high water absorption rate. Before pasting the tiles, the tiles need to be soaked in water to achieve sufficient bond strength.
At present, the tiling method widely used in Europe is the so-called thin-layer sticking method, that is, the polymer-modified tile adhesive batch is scraped on the surface of the base layer to be tiled in advance with a toothed spatula to form raised stripes. And the mortar layer of uniform thickness, then press the tiles on it and twist slightly, the thickness of the mortar layer is about 2 to 4mm. Due to the modification of cellulose ether and Redispersible Polymer powder, the use of this tile adhesive has good bonding performance to different types of base layers and surface layers including fully vitrified tiles with extremely low water absorption, and has Good flexibility, so as to absorb the stress caused by factors such as temperature difference, and good anti-sag, long enough open time for thin-layer construction, which can greatly speed up the construction speed, easy to operate and no need to pre-wet the tiles in water. This construction method is easy to operate and easy to carry out on-site construction quality control.