The Role of Redispersible Latex Powder in Tile Adhesives
Release Time:
2019-07-26
Source:
The redispersible latex powder, upon redispersion, forms a film and acts as a secondary binder to enhance adhesion; the protective colloid is absorbed by the mortar matrix (and remains intact after film formation, or can be redispersed a second time); the film-forming polymer resin serves as a reinforcing agent, uniformly distributed throughout the mortar matrix, thereby increasing its cohesive strength.
1. What functions does redispersible latex powder perform in mortar?
The redispersible latex powder, upon redispersion, forms a film and acts as a secondary adhesive to enhance bond strength; the protective colloid is absorbed by the mortar matrix (and remains intact after film formation, or can be redispersed a second time); the film-forming polymer resin serves as a reinforcing agent, uniformly distributed throughout the mortar matrix, thereby increasing its cohesive strength.
2. What are the functions of redispersible latex powder in wet mortar?
Adjust to enhance construction performance; improve workability; increase thixotropy and anti-sag properties; enhance cohesion; extend open time; and improve water retention.
3. What functions does redispersible latex powder perform in mortar after it has cured?
Enhance tensile strength; improve flexural strength; reduce the elastic modulus; increase deformability; increase material density; enhance wear resistance; improve cohesive strength; decrease carbonation depth; reduce water absorption; impart excellent hydrophobic properties (by incorporating hydrophobic polymer powder).
4. In what ways does redispersible latex powder function in different dry-mix mortar products?
The introduction of tile adhesives has, to a certain extent, ensured the reliability of tile installation. Different construction practices and methods impose varying performance requirements on tile adhesives. In current domestic tile-installation projects, the thick-bonding method—traditionally involving back-coating with adhesive—remains the dominant technique. When this method is used, the tile adhesive is required to be easy to mix; easy to apply with a trowel and non-sticky to the tool; exhibit good viscosity; and provide excellent resistance to slippage. With advancements in tile-adhesive technology and improvements in application techniques, the trowel-applied (thin-bonding) method has also been gradually adopted. Under this method, the tile adhesive must be easy to mix; have good spreadability and remain non-sticky to the trowel; offer superior resistance to slippage; demonstrate excellent wettability on tiles; and provide a longer open time.
① Effect of adding redispersible latex powder on the fresh mortar of tile adhesives:
A. Extend working hours and adjustable time;
B. Enhance water retention to ensure proper hydration of the cement;
C. Enhancing sag resistance (special modified rubber powder)
D. Improved workability (easy to apply on the substrate and easy to press tiles into the adhesive).
② Effect of adding redispersible latex powder on the hardened mortar of tile adhesive:
A. Exhibits excellent adhesion to a wide range of substrates, including concrete, plaster, wood, existing tiles, and PVC.
B. Exhibits excellent adaptability across a wide range of climatic conditions.
