2. The reason for the "empty drum"

Wall and floor tile bonding is a typical composite system structure. It consists of a waterproof layer, a binder and a ceramic tile. As shown in the following figure: the substrate and ceramic tile in the composite system are generally regarded as rigid materials, while the binder is considered It is a flexible material that can withstand the stress caused by a certain displacement and deformation; therefore, the influence of environmental temperature difference on the composite system is pasted with traditional cement sand or inferior binder, which often peels off after a period of time.

※ Drying and shrinkage of cement-based adhesives can also cause shear stress, so the ability to deform large-sized tiles and adhesives is critical.

3. The solution to the problem

3-1 Selection of binder:

※ Improvement method:

On the basis of 3, the back side of the large brick (side length ≥ 300 mm) is pre-processed.

● The mold release agent (alumina, etc.) on the back of the tile should be cleaned with water.

● Use the interface agent primer EPP308 or two-component adhesive EPBB800 to paint the back of the tile to improve its adhesion.

Cleaning

Brushing vitrified brick backing