When many developers do wall plastering, in order to avoid the problem of hollowing and cracking in the later stage. Gypsum mortar is usually used for wall leveling. Before plastering gypsum mortar, the key step is to use an elastic waterproof interface agent.
So, what effect does the interface agent have on the effect of gypsum mortar?

Composition of interface agent for plastering

It is an emulsion-type interface product composed of special elastic acrylic emulsion as the main component and a variety of additives. It has excellent permeability. It can fully infiltrate the surface of the substrate. Make the base layer dense. Improve the adhesion of the smooth interface. It is suitable for surface treatment of substrates such as concrete, autoclaved aerated blocks, autoclaved fly ash bricks, aluminum molds, prefabricated wall panels, capillary networks, etc. It is generally called an elastic waterproof interface agent.

Function of elastic waterproof interface agent

Improve bonding strength

Spraying elastic waterproof interface agent on the smooth and dense concrete surface can improve the bonding strength between plastering gypsum and the wall base layer. Experiments have shown that for walls coated with interface agents. When pulled out, the damaged interface is located inside the block wall. And the tensile bonding strength between the plaster layer and the base layer can be increased by more than 1 times.

Strengthening the substrate

The surface strength of aerated concrete blocks and lightweight panels is low. Spraying elastic waterproof interface agents on their surfaces can enhance the mechanical strength of the wall material surface. Improve the bonding strength between the plastering gypsum and the wall base layer.

Waterproof and moisture-proof

Gypsum has strong hygroscopicity. In particular, the backhand wall of the bathroom and the wall around the window have high humidity. Through interface agent treatment, moisture damage to indoor putty, paint, and wallpaper can be effectively reduced. Reduce the risk of putty powdering, mildew, and peeling.

Reduce the water absorption rate of the substrate

Aerated concrete blocks and lightweight panels have high water absorption rates. It is easy to cause the plastering gypsum to lose water and fail to fully hydrate, with low strength and easy to peel off. Through interface agent treatment, the water absorption rate of the substrate can be effectively reduced. Ensure the stability of the gypsum hydration environment. At the same time, it greatly improves the smoothness of gypsum mortar scraping. Seal the pores on the concrete surface to avoid or greatly reduce the problem of bubbles in the plaster during construction.

Buffering base stress deformation

The base wall is always shrinking and deforming due to environmental changes in temperature and humidity. The shear force of uneven settlement is affected. Through interface agent treatment, the accumulation of shrinkage stress of wall materials between interfaces can be buffered or eliminated. Effectively reduce the hollowing and cracking of the plaster layer. Boards with and without interface agents. We tested the effect of buffering stress under 3 cm deformation. It can be clearly seen that the plaster and base layer are not peeled off for the board with interface agent.

How to choose interface agent

It is recommended to use the interface agent that matches the gypsum mortar, which is the simplest way. If not, it is recommended to use acrylic emulsion interface agent. Spraying is recommended for interface agent construction. Spraying can cover all kinds of dead corners and tiny pores in all directions. Rolling cannot achieve full coverage. And a lot of emulsion will be wasted.