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Momentive CoatOSil DRI – FAQ

June 11th, 2018

All Your Questions About CoatOSil* DRI Waterborne Silicone Answered

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1. What is CoatOSil* DRI waterborne silicone?

CoatOSil* DRI waterborne silicone is a low viscosity, film-forming emulsions that can act either as a co-binder or additive in latex systems. As a silicone, CoatOSil* DRI has good heat or temperature resistance, good UV resistance, and good water resistance.

2. What is the main difference between CoatOSil* DRI waterborne silicone and typical silicone emulsion?

CoatOSil* DRI waterborne silicone is comprised of cross-linked silicone structures as small particles in emulsion form, whereas typical silicone emulsions contain linear non-cross linked silicones. This innovative chemical structure enables it to overcome the difficulties of combining silicone materials with organic waterborne resins such as instability over time and migration or blooming to the surface of the coating.

3. Why should I consider using CoatOSil* DRI waterborne silicone instead of other common silicone emulsion products?

CoatOSil* DRI waterborne silicone cures at room temperature to form an elastomeric film, and can serve as a binder or co-binder unlike many typical silicone emulsions that act like plasticizers, not binders.

CoatOSil* DRI waterborne silicone has been shown to improve hydrophobicity and elongation properties when used as a cobinder with acrylic latexes, resulting in more flexible coatings and sealants. As a co-binder, it is very compatible with many waterborne (WB) organic binders such as acrylic latex, PUD, WB alkyd, WB epoxy, etc.  CoatOSil DRI waterborne silicone can help reduce water uptake and improve UV resistance in organic waterborne coating compositions. It may also be considered as a sole binder when maximizing thermal and UV stability is a priority, such as in high-temperature resistant industrial applications.

4. What does compatibility mean?

CoatOSil*DRI waterborne silicone is very miscible and stable in liquid emulsions with other WB polymer binders such as acrylic latex etc. In cured solid state, it forms an uniform co-film with no further silicone migration.

5. Why does CoatOSil* DRI waterborne silicone not have the recoatability/adhesion issues typically associated with silicone additives?

With its immobile crosslinked structure, CoatOSil* DRI waterborne silicone distributes through the whole coating formulation while its functional groups interact well with both substrates and other coating compositions.

6. In summary, what are the key features and typical benefits of CoatOSil DRI waterborne silicone?

Reduced water uptake and improved UV resistance in latex systems.

Outstanding thermal and UV resistance as a sole binder.

A more flexible coating as a cobinder with acrylic latex, without detrimental effects on dirt pick-up

Compatible with a variety of waterborne polymersystems, including many:

  • Acrylics
  • Styrene Acrylics
  • Epoxies
  • PUDs
  • Alkyds
7. What are some of the potential applications for which CoatOSil* DRI waterborne silicone may be considered?
  • Roof coatings
  • Exterior coatings
  • Wood coatings
  • Industrial coatings

*CoatOSil is a trademark of Momentive Performance Materials