Application of Redispersible Latex Powder in Tile Adhesives
Release Time:
2021-06-28
Source:
Redispersible latex powder in tile adhesive
Application of Redispersible Latex Powder in Tile Adhesives
Different dry-mix mortar products have varying performance requirements for redispersible latex powder. Due to their excellent decorative and functional properties—such as durability, water resistance, and ease of cleaning—ceramic tiles are widely used in a variety of applications, including wall coverings, flooring, ceilings, fireplaces, murals, and swimming pools, both indoors and outdoors. Tile adhesives are cement-based bonding materials specifically designed for installing ceramic tiles; they are also commonly referred to as tile mortars. These adhesives can be used to bond ceramic tiles, polished tiles, and natural stones such as granite. Tile adhesives typically consist of aggregates, portland cement, a small amount of hydrated lime, and functional additives tailored to meet specific product-performance requirements. In the past, bonding materials for tiles and stone were almost exclusively thick-bed mortars mixed on-site, a method that was inefficient, material-intensive, and difficult to execute. Moreover, when bonding large-format tiles with low water absorption, such mortars were prone to delamination, making it challenging to ensure consistent construction quality. By contrast, the use of high-performance tile adhesives effectively addresses these challenges, resulting in more aesthetically pleasing and safer finished surfaces, faster installation, and reduced material consumption.
The primary functions of redispersible latex powder in tile adhesives are as follows:
(1) Effects on fresh mortar:
① Extend working hours and adjust schedules;
② Enhance water retention to ensure cement hydration;
③ Enhance sag resistance (using specially modified rubber powder);
④ Improved workability (easy to apply on the substrate and easy to press tiles into the adhesive)
(2) Effects on hardened mortar
① Exhibits excellent adhesion to a wide range of substrates, including concrete, plaster, wood, existing tiles, and PVC.
② Exhibits excellent formability under various climatic conditions.
As the cement content increases, the initial bond strength of the tile adhesive also increases; moreover, both the water-immersed tensile bond strength and the thermally aged tensile bond strength increase accordingly. With increasing dosage of redispersible latex powder, the water-immersed tensile bond strength and the thermally aged tensile bond strength of the tile adhesive both rise; however, the increase in thermally aged tensile bond strength is more pronounced.
