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High Performance at Low Use Levels

Dow Corning® 67 Additive, Dow Corning® 500W Additive, Dow Corning® 501W Additive and Dow Corning® 502W Additive provide excellent wetting performance at low addition levels with little or no influence on slip.

Achieving excellent wetting without affecting slip properties is particularly important for wood floor coatings, and Dow Corning® brand superwetter additives provide the necessary performance. In a waterborne PUD-based flooring coating, for example, all four additives provide excellent wetting performance versus competitive organic and silicone wetting additives over different substrates. The toolbox approach also enables formulators to choose the right product for a specific application, while at the same time reducing the number of products they must maintain in their raw material portfolios. The superior performance can be measured in multiple waterborne coatings by the surface appearance and coefficient of friction (Figures 1 and 2).


Figure 1: Surface appearance and slip properties of a waterborne, PUD-based wood coating with the addition of Dow Corning® 67 Additive, Dow Corning® 500W Additive, Dow Corning® 501W Additive and Dow Corning® 502W Additive. Additives were added at 0.2 weight percent in the total formulation.

Surface appearance and slip properties of a waterborne, PUD-based wood coating with the addition of Dow Corning® superwetter additives
 

Figure 2: Surface appearance and slip properties of a waterborne, acrylic-based wood coating with the addition of Dow Corning® 67 Additive, Dow Corning® 500W Additive, Dow Corning® 501W Additive and Dow Corning® 502W Additive. Additives were added at 0.2 weight percent in the total formulation.

Surface appearance and slip properties of a waterborne, acrylic-based wood coating with the addition of Dow Corning® superwetter additives

 


Multiple Options for Foam Control

Because wetting agents are surfactants, they promote foam generation to some extent. The chemistry of the surfactant and the total formulation dictate the level of foam generated. Important to the formulator is that this foam can be controlled using foam control additives.

Dow Corning offers a range of antifoam additives to control any foam generated when using this new family of wetting agents.


Figure 3: Example of performance of Dow Corning® antifoams when formulated with surfactants: Dow Corning® 67 Additive is added at 0.4 weight percent into a flexographic gravure ink formulation. Antifoams were added at just 0.1 weight percent in the total formulation. Foam height is measured after high-speed shearing and is clearly vastly reduced with the addition of both Dow Corning® 62 Additive and Dow Corning® 65 Additive*.

Dow Corning provides several options for controlling foam when using any of the superwetter additives

 

Stable Wetting Performance at High pH

The chemistry of silicone surfactants can often mean they are not stable in higher pH formulations and performance is lost during storage of the coating or ink.

Dow Corning 500W Additive, however, is ideally suited for higher pH formulations and shows good wetting performance initially and on longer-term storage. Other additives show high surface tension at pH 11, indicating instability. With Dow Corning 500W Additive, surface tension remains consistently low.


Figure 4: Stability of Dow Corning® 500W Additive as demonstrated by dynamic surface tension stability over time in a pH 11 solution. Static surface tension remains consistent even after 1 month of storage.

Dow Corning® 500W Additive shows good stability initially and on longer-term storage in high pH formulations
 

< Return to Dow Corning superwetter additives overview.


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