Powder Additives for Dry Mix Mortars with Rising Demands

Dry mortar is a multi-component plant system. Common uses include screw mortar, plaster, stone, floor leveling compounds, tile adhesives, and plaster.

The need for mineral slurries has steadily increased in recent decades. Without additives, this technical challenge is hard to overcome. The additive content in a typical dry mix ranges from 0.1 to 10%. However, these additives have an important effect on the properties of the mortar. Various types of additives are used in dry mix grouts, for example, air conditioning agents, accelerators, and softening additives have a great influence on the properties of the grout. Various types of additives are used in dry mix grouts, for example, air conditioning agents, accelerators, retardants, ultra plastic modifiers, and Rogelio. Three other product groups are discussed in more detail in this document: reducing agents, stripping powders, and dispensing powders, superplasticizers, and rheology modifiers.

Three other product groups are discussed in more detail in this paper: shrinkage reducing agents, powder makers, and powder derivatives. De-foaming powder is used in many dry mortar formulations. These are examples of systems based on cement, gypsum, limestone, and recyclable polymer powder (leveling compounds, screwdrivers, tile adhesives, composite filters, powder coating, plaster, repair mortar. Defoamer Powder is used to reduce and control air content in wet slurries. In general, this leads to greater stability of the mortar. In any case, low air content is not preferred. Tile adhesives are formulated with higher air content for better workability and a precise fit of the tile. Also in light screeds, a higher air content is important to save weight. Powder Defoamer consists of a liquid phase that is applied to solid substrates with high adsorption capacity and rapid desorption. Powder Defoamer is expected to provide free-flowing properties and a low tendency to form lumps during storage. The liquid phase of the Defoamer consists of compounds that influence the surface tension of the wet mortar, e.g. Hydrocarbons, polyglycol, or polyether siloxanes. The wetting properties of the liquid components are essential to obtain a homogeneous and bubble-free surface of the mortar. The more hydrophobic formulations provide more defoamer effectively but tend to generate surface defects such as stains and pitting (Figure 6). At times, interactions between Defoamer and plasticizers can be observed, which also leads to an inhomogeneous visual appearance. Oftentimes, intensive empirical defoaming screens are needed to obtain the best compromise between defoaming power and the visual appearance of the applied material.

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