Main Benefits of Landercoll® Cellulose Ethers
Landercoll® is used very often as a thickener in building applications as it prevents segregation and improves the cohesion of the formulation
components. The viscosity of Landercoll® depends on the degree of polymerization, concentration, temperature, shear rate, concentration of dissolved salts and modification.
In dry mix mortar, thickening power of pure grades is related to their solution viscosity. On the other hand, mortar viscosity of modified grades is not necessarily proportional to the solution viscosity
Landercoll® substantially reduces the loss of water into absorbing substrates in formulations like cement renders, tile cements, gypsum plasters, etc.
The water retention ability of Landercoll® also strongly enhances the adhesion strength of thin-bed mortars. This is because the binders in the mortar such as the cement and gypsum have enough time for hydration and at the same time do not lose water.
From the graph on the above, we can see that the water retention is strongly correlated to the viscosity levels.
When the addition rate of Landercoll® reaches a high dosage, the difference in water retention among the different viscosity grades decreases.
Air entraining & Lubrication effects
Landercoll® shows surface activity as it is a polymer surfactant that has hydrophilic and hydrophobic groups in its molecules. When the mortars with Landercoll® are mixed with water,air voids are entrained into the matrix which provide positive effects such as easy handling (light weight),improved workability and cost saving (high mortar yield).
In addition, Landercoll® enhances the extrudability in cement and ceramic extrusion process due to its lubrication effects which reduce the extrusion pressure.