Borchi Gel LW 44 Polyurethane based Bayer-Börchers Rheology Modifier/ Thickener >> Associative >> Urethane (HEUR) Epoxy Resins Polyester Polyurethane Coatings >> Waterborne Borchi® Gel LW 44 1 Non ionic, polyurethane based thickener solvent free product Description Rheological additives affect the flow properties of liquids. Such properties are characterised by the physical parameters viscosity, shear stress and shear rate. Very few liquids of any practical significance actually behave like ideal liquids. Most liquids exhibit rheological properties between those of liquids and solids. They are thus elastic as well as viscous. These are desirable properties in paints. A paint's application properties and shelf-life, for example, can be modified with additives. In many cases rheological properties under low-shear (dip-coating) and high-shear (brushing and rollering) conditions are of crucial importance in the application of paints. The rheology of the paint can be modified in specific ways using appropriate additives. Properties Even small amounts of Borchi® Gel LW 44 bring about significant thickening of the aqueous phase. The resulting liquid is pseudoplastic, i.e. its viscosity is inversely proportional to its shear rate. Borchi® Gel LW 44 is therefore particularly suitable for low-viscosity applications such as spraying and dip-coating of water-borne and water-emulsifiable paint systems (finishing paints and primers), aqueous 2-component polyurethane-based systems and 2-component epoxy systems and polyester systems. lt can also be used for copolymer dispersions depending on the requirements profile. Particularly advantageous in this context is its effect on viscosity under low-shear conditions. Viscosity under highshear conditions can be adjusted if necessary by combining Borchi® Gel LW 44 with other rheological additives. In contrast to conventional polyurethane-based thickeners, Borchi® Gel LW 44 is characterised by more stable viscosity when used in conjunction with wetting agents and film-forming aids. Borchi® Gel LW 44 is characterised by good efficacy and does not impair the water resistance of dispersion films at the recommended addition rates. Borchi® Gel LW 44 is shear-stable and can also be used as a dispersing agent. lt does not adversely affect the gloss properties of finishing paints. Mixing and addition rate Because of its low intrinsic viscosity, Borchi® Gel LW 44 can be used without predilution. In particular instances, predilution (e.g. 1 : 9 in water) may confer certain advantages. Recommended addition rates vary between 0.1 and 2% Borchi® Gel LW 44 relative to total formulation. Non ionic, polyurethane based thickener solvent free product, free of impurities and insoluble matter. The resulting liquid is pseudoplastic, its viscosity is inversely proportional to its shear rate. Suitable for low-viscosity applications such as spraying and dip-coating of water-borne and water-emulsifiable paint systems (finishing paints and primers), aqueous 2-component polyurethane-based systems and 2-component epoxy systems and polyester systems. Can also be used for copolymer dispersions depending on the requirements profile. Particularly advantageous in this context is its effect on viscosity under low-shear conditions. Viscosity under highshear conditions can be adjusted if necessary by combiningthis product with other rheological additives. Characterised by good stable viscosity when used in conjunction with wetting agents and film-forming aids. Characterised by good efficacy and does not impair the water resistance of dispersion films at the recommended addition rates. Shear-stable and can also be used as a dispersing agent. Does not adversely affect the gloss properties of finishing paints. Because of its low intrinsic viscosity, can be used without predilution. In particular instances, predilution (e.g. 1 : 9 in water) may confer certain advantages. Recommended usag elevel: 0.1-2% relative to total formulation.