The role of redispersible latex powder and hydroxypropyl methyl cellulose in ceramic tile adhesive?

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Redispersible latex powder - improve the consistency and smoothness of the system in the wet mixing state. Due to the characteristics of the polymer, the cohesion of the wet mixture is greatly improved, which makes a great contribution to the workability; After drying, it can provide the adhesion to the smooth and dense surface, improve the interface effect of sand and gravel, and pores. On the premise of ensuring the amount of addition, it can enrich and form a film at the interface, make the ceramic tile adhesive have a certain flexibility, reduce the elastic modulus, and absorb the thermal deformation stress to a large extent. In case of water immersion in the later stage, there is still inconsistency in water resistance, buffer temperature and material deformation (ceramic tile deformation coefficient 6 × 10-6/℃, cement concrete deformation coefficient 10 × 10-6/℃) to improve the weather resistance.

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Hydroxypropyl methyl cellulose HPMC - provides good water retention and workability for freshly mixed mortar, especially plays a key role in wetting area. In order to ensure the smooth progress of hydration reaction, excessive water absorption of substrate and evaporation of surface water can be prevented. Because of its air-entraining property (1900g/L - 1400g/LPO400 sand 600HPMC2), the unit weight of ceramic tile adhesive is reduced, materials are saved and the elastic modulus of hardened mortar is reduced.

The redispersible latex powder of ceramic tile adhesive is a green, energy-saving, high-quality, multi-purpose powder building material, and an essential functional additive for dry-mixed mortar. It can improve the performance of mortar, improve the strength of mortar, improve the bonding strength of mortar and various substrates, improve the flexibility and variability of mortar, compressive strength, flexural strength, abrasion resistance, toughness, adhesion, water retention and constructability. The performance of redispersible emulsion powder of ceramic tile adhesive is relatively strong, and the redispersible emulsion powder of ceramic tile adhesive has high bonding ability and unique performance. Therefore, their application range is extremely wide. Hydroxypropyl methyl cellulose plays an important role in water retention, thickening and construction performance in the early stage, and ceramic tile adhesive redispersible latex powder plays a role in the strength in the later stage, which plays a very good role in the firmness, acid and alkali resistance of the project. Effect of redispersible ceramic tile adhesive latex powder on freshly mixed mortar: extend the working time and adjustable time to improve the water retention performance to ensure the hydration of cement to improve the sag resistance (special modified rubber powder) to improve the workability (easy to construct on the substrate, easy to press the ceramic tile into the adhesive). The effect on hardened mortar has good adhesion with various substrates, including concrete, plastering, wood, old ceramic tile PVC has good deformation ability under various climatic conditions.

The addition of redispersible emulsion powder of ceramic tile adhesive has a very obvious effect on the improvement of the performance of cement-based ceramic tile adhesive, and has a significant effect on the adhesive strength, water resistance and aging resistance. At present, there are many kinds of redispersible emulsion powder for ceramic tile adhesive on the market, such as acrylic redispersible emulsion powder, styrene-acrylic powder, vinyl acetate - vinyl copolymer, etc. Generally speaking, the most redispersible emulsion powder for ceramic tile adhesive used in the market is vinyl acetate - vinyl copolymer.

(1) With the increase of cement content, the strength of redispersible latex powder of ceramic tile adhesive increases, and the tensile adhesive strength after immersion and thermal aging also increase.

(2) With the increase of the amount of redispersible latex powder of ceramic tile adhesive, the tensile bond strength after immersion of redispersible latex powder of ceramic tile adhesive and the tensile bond strength after thermal aging will increase, but the tensile bond strength after thermal aging will increase significantly.

Because of its good decorative and functional properties, such as durability, waterproof and easy to clean, ceramic tiles are widely used, including walls, floors, ceilings and swimming pools, and can be used indoors and outdoors. The traditional pasting method of ceramic tiles is the thick layer construction method, that is, first apply the ordinary mortar on the back of the ceramic tile, and then paste the ceramic tile on the base layer. The thickness of the mortar layer is about 10 to 30 mm. Although this method is very suitable for construction on uneven base, its disadvantages are low tiling efficiency, high technical proficiency requirements for workers, increased risk of falling off due to poor flexibility of mortar, and difficult to strictly control the quality of mortar at the construction site. This method is only applicable to high water absorption ceramic tiles. Before pasting ceramic tiles, it is necessary to immerse them in water in order to achieve sufficient bonding strength.

At present, the widely used tiling method in Europe is the so-called thin-layer adhesive method, that is, using a tooth-shaped spatula to scrape the polymer modified ceramic tile adhesive batch onto the surface of the base layer to be tiled in advance to form a mortar layer with convex stripes and uniform thickness, and then press the ceramic tile on its upper surface and slightly twist it. The thickness of the mortar layer is about 2 to 4 mm. Due to the modification effect of cellulose ether and redispersible emulsion powder, the use of this ceramic tile adhesive has good bonding performance and good flexibility for different types of base course and surface course including fully vitrified brick with extremely low water absorption, so as to absorb the stress caused by temperature difference and other factors, as well as excellent anti-sagging property and long enough opening time, which can greatly speed up the construction speed It is easy to operate and does not need to pre-wet the tiles in the water. This construction method is easy to operate and easy to carry out on-site construction quality control.



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