Capstone™ can be added in the grind phase to eliminate the need for a pigment wetting agent and defoamer. It can also be added during the letdown phase to improve surface wetting, leveling, and anti-block properties. Selection of the appropriate grade of Capstone™ is dependent on the desired functionality and the phase at which it will be added. The Image below highlights common Capstone™ grades and the functionality that they provide.
Capstone™ for Pigment Wetting
Pigment wetting agents are added during the grind phase and are intended to help replace the air surrounding the pigment particles with the carrier medium which its typically water. Capstone™ FS-30
and Capstone™ FS-31
are non-ionic surfactants that can be added in a very small dosage during the grind phase to improve pigment wetting. The improvement in pigment wetting provided by Capstone™ eliminates the need for other wetting agents and leads to an average of 10X reduction in surfactant usage.
Capstone™ for Leveling & Anti-Blocking
Water-based paints often have issues wetting out low energy surfaces. The large contact angle of latex paint on a surface can cause poor adhesion and surface defects like orange peel, pinholes, and cratering. This is especially a problem when a high gloss finish is required. The use of a leveling agent is typically required to ensure a defect free finish. Capstone™ FS-61
and Capstone™ FS-63
are powerful leveling agents that can be added to latex paint formulations during the letdown phase. An added benefit to using Capstone™ as a leveling aid is that it also provides excellent anti-block properties and eliminates the need for waxes and other common anti-blocking agents in the formulation.
Capstone™ for Dirt Pick-Up Resistance
Latex paints used in architectural applications have a tendency to pick up dirt and oily stains over time. The addition of Capstone™ FS-81
in low-sheen paints and waterborne coatings improves cleanability of oil based stains and improves oil and dirt repellency. Additionally, Capstone™ FS-81 does not interfere with re-coat adhesion or create water repellency. The graph below illustrates the increase in contact angle of oil on a painted surface that is seen when Capstone™ FS-81 is added to the formulation.