Efficient Gloss Control Without Impacting Viscosity
The Orgasol® and Rilsan® D products provide a multitude of benefits to solvent borne, aqueous, and UV coating formulations. The best fit, from a technical and commercial perspective, is situations when the formulator wants to improve two or more coating performance parameters.
In this section, the focus is on the use of these materials for gloss control.
Orgasol® powders use as a Matting or Texturing Agent
The Orgasol® and Rilsan® D materials provide benefits through physical methods so it is important for them to retain their shape and not be melted or dissolved. In the case of gloss control, the most efficient matting occurs when the dry film thickness of the coating is approximately the same as the diameter of the Orgasol® material used in the formulation. If the diameter of the Orgasol® materials is larger than the DFT, a texture will be created. On average, Orgasol® material will reduce gloss to a satin finish, a gloss number of 30 to 50 measured at 60 degrees. If a lower gloss is required, there is a synergistic effect between the Orgasol® products and silica. Adding both products in a 1:1 ratio will further reduce gloss.
In most applications, the loading of the Orgasol® or Rilsan® D is roughly 2-5% on a weight basis, which is similar to other coating additives. If a formulator wants to improve scratch and mar resistance without impacting gloss, keeping the Orgasol® or Rilsan® D loading <1.5% on a weight basis will accomplish this.
Using Orgasol® Powders as a Matting Agent in 100% Solids UV Coating Formulation
The graph displays the use of differing concentrations of the Orgasol® 2001 UD Nat 1 (5 micron diameter) and Orgasol® 2001 EXD Nat 1 (10 micron diameter) in a UV coating formulation with a DFT of 7 microns. Both products reduce the gloss of the UV varnish. Notice how the Orgasol® 2001 EXD reduces gloss more than the same amount of silica. In addition, notice the diminishing impact on gloss of the Orgasol® products once the loading increases above 6% on a weight basis.
Orgasol® Powders provide good matting efficiency
A ratio of 1:1, particle size/DFT, will provide optimum matting.
- Adjust Orgasol® powder loading from low to high to optimize the formulation.
- Use a combination of Orgasol® powders to adjust the gloss.
- To reduce gloss to less than 30GU measured at 60°, use a combination of Orgasol® powders with silica.
Abrasion Resistance and Gloss Reduction
This graph demonstrates how the formulation incorporating both Orgasol® 2001 UD Nat 1 and silica in a 1:1 ratio provides the best combination of improving abrasion resistance while reducing gloss. Abrasion resistance is measured using Taber CS17 – 500g and the result is displayed with the yellow bars and the value is read using the right hand axis. Meanwhile, the gloss of the various formulations is displayed on the blue line and the value is read using the left hand axis. In this instance, a 5% loading of Orgasol® 2001 UD Nat 1 with 5% silica provides the best combination of gloss reduction and abrasion resistance improvement.