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Rheology, settling and applicability

Rheology, settling and applicability Imerys minerals for improved viscosity, settling and application

Imerys talcs, kaolins and precipitated calcium carbonates (PCC) are ideal for improving rheology and viscosity in paints and coatings.

Viscosity

Imerys talc is naturally oleophilic and has the ability to associate with typical coating resins such as alkyds, emulsions, epoxies, amines, and polyols.

Talc creates weak bonds with these resins that result in increased low-shear viscosity. When shear is applied the bonds break quickly, resulting in shear-thinning coating rheology that is ideal for spray applications for example.

Improved rheology reduces sagging and in-can settling.

Thixotropy

Minerals are cost-effective replacements for higher-priced thixotropes such as synthetic silicas. They incorporate easily into solvent-based paints and coatings, and do not require activation by heat or special solvents.

Recommended grades

  • Ultrafine Jetfine® 1 talc is an excellent rheology modifier in VOC-compliant alkyd paints. In addition to the properties it imparts as a pigment extender, Jetfine® 1 optimizes viscosity behavior, application properties and outdoor durability. Jetfine® 1 can be used effectively in gloss, semi-gloss, satin and matt VOC-compliant alkyd paints.
  • As well as exceptional opacity, our Supreme kaolin grade confers unique rheological properties to paint. This low shear thickening effect enables formulators to reduce thickener requirement, or can be harnessed to improve settling properties and sag resistance. It is particularly beneficial in high quality matt paint formulations, and in high gel strength paints.
  • Our Socal® UP-G displays a unique morphology made of calcite pseudo-spherical shapes in a microshell structure. This unique morphology enables paint manufacturers to considerably reduce rheological additive content and achieve similar viscosity.

 

 

We offer a full range of bespoke formulation and technical and process support services to help you match the right mineral grade to your application requirement.

Please contact us, we will be only too happy to help.

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Paints and Coatings