DOWSIL™ 67 Additive
Imparts leveling and wetting to water-borne and radiation-curable formulations on difficult substrates such as polyethylene, polypropylene, polyester and polyvinylchloride improves wetting and surface appearance of water-borne flexographic ink.
Dow Consumer Solutions Introduces a Family of Superwetter Additives for High-Performance Water-Based and UV Cured Inks, Coatings and Overprint Varnishes:
- DOWSIL™ 67 Additive
- DOWSIL™ 500W Additive
- DOWSIL™ 501W Additive
- DOWSIL™ 502W Additive
Do you have difficulty achieving effective substrate wetting with your waterborne or UV cured formulations, particularly on challenging substrates like wood, plastic and metal? Have you tried other silicone additives, only to see undesirable effects on slip properties?
With its range of functionalities and hydrophilicities, the new family of superwetter additives from Dow Consumer Solutions can be used in waterborne, solventborne and solventless radiation curable coatings. These additives can help you obtain the wetting performance you want for your formulation and substrate – and do so with little or no impact on slip properties.
Advantages of Dow Consumer Solutions Superwetters
- Wide range of products allows choice of exactly the right product for the application, allowing for cost-effective, optimum performance
- Consistent wetting performance across a wide range of formulations and over a wide range of substrates
- Can be used in both waterborne and UV cured paints, inks and coatings
- Improve wetting of difficult substrates, such as wood, plastic and metal
- Little or no impact on the coefficient of friction/slip properties
- 100% active; low VOC, solvent-free and BTX-free
- Effective at low addition levels (recommended 0.1 to 0.4% as supplied, based on total formulation)
- Easy-to-use, low viscosity liquids
- Enable minimization of raw material portfolio
Making an Informed Choice of Superwetter
Dow Consumer Solutions understands that every formulation is different. By providing more information about structure, end capping and hydrophilicity/HLB, Dow Consumer Solutions seeks to improve the quality of wetting additive choices. All four products in this DOWSIL™ Superwetter family are 100% silicone polyether copolymers and are characterized by being usable in both waterborne and UV coatings formulations, offering recoatability and a high level of consistency across different types of binders.
Products Silicone Polyether Copolymer (%) Viscosity (cst) HLB-EO* End Cap Surface Tension (aqueous 0.1 % solution) DOWSIL™ 67 Additive 100 31-51 11.5 OH 21.0 DOWSIL™ 500W Additive 100 25.5-29.5 10.7 OAc 22.0 DOWSIL™ 501W Additive 100 10-30 10.6 OMe 20.5 DOWSIL™ 502W Additive 100 49-75 13.2 OH 22.4
Performance with Regulatory Compliance
One hundred percent silicone polyether copolymers and solvent free technology mean no contribution to VOC when using these additives. DOWSIL 67 Additive is listed in the Swiss ordinance RS 817.023.21.
Products Swiss Ordinance RS 817.023.21 Annex 6 DOWSIL™ 67 Additive All substances intentionally formulated in DOWSIL™ 67Additive are listed on Annex 6, Part A or Part B, of the
Swiss ordinance RS 817.023.21
High Performance at Low Use Levels
DOWSIL 67 Additive, DOWSIL 500W Additive, DOWSIL 501W Additive and DOWSIL 502W Additive provide excellent wetting performance at low addition levels with little or no influence on slip. 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 DOWSIL 67 Additive, DOWSIL 500W Additive, DOWSIL 501W Additive and DOWSIL 502W Additive. Additives were added at 0.2 weight percent in the total formulation.
Figure 2: Surface appearance and slip properties of a waterborne, acrylic-based wood coating with the addition of DOWSIL 67 Additive, DOWSIL 500W Additive, DOWSIL 501W Additive and DOWSIL 502W Additive. Additives were added at 0.2 weight percent in the total formulation.
Figure 3: Improved wetting performance in a waterborne PUD coating with DOWSIL 67 Additive.
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 Consumer Solutions offers a range of antifoam additives to control any foam generated when using this new family of wetting agents.
Figure 4: Example of performance of DOWSIL™ antifoams when formulated with surfactants: DOWSIL 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 DOWSIL 62 Additive and DOWSIL 65 Additive*.