CELLOSIZE Applications: Paints and Coatings

	Applications


			Overview Agriculture Building and Construction Chemical Processing Personal Care and Cleaning Products Oil and Gas Exploration Paints and Coatings Paper Textiles

Latex Paints — In latex paint formulations, CELLOSIZE™ HEC offers ease of solution, low-foaming, thickening efficiency, and excellent color development and acceptance. Its non-ionic character contributes stabilization over a wide pH range and permits broad formulating latitude. The QP-type is of particular interest where controlled hydration is desired, as in either the direct addition of the thickener to the water at the beginning of the pigment grind, or the preparation of aqueous slurries of HEC to be added in the let-down. Enzyme resistant grades (ER-grades) of CELLOSIZE HEC are often chosen by formulators for added microbial stability.

The higher viscosity grades (QP-15000H, QP-30000H, QP-52000H, and QP-100MH) have been developed primarily for use in latex systems where the water-soluble components must be reduced to a minimum.

The effect of CELLOSIZE HEC solution viscosity (viscosity grade) on the Stormer viscosity of latex paint was determined by preparing in the laboratory a series of three prototypical paint formulations using identical raw materials and varying only the grade of CELLOSIZE HEC used in the paint. The data from these experiments were plotted, and the data were fit to a power law

regression with a high degree of correlation. See the graphs below. The specific grades of CELLOSIZE HEC used in each paint formulation are annotated on the graphs.

These data clearly suggest that viscosity variation within a grade of CELLOSIZE HEC does not significantly impact Stormer viscosity, and emphasize the robust and reproducible thickening character of CELLOSIZE HEC. To affect a significant change in Stormer viscosity requires switching to a different grade of CELLOSIZE HEC.

Effect of CELLOSIZE HEC solution viscosity on latex paint Stormer viscosity (UCAR™ Emulsion Systems interior vinyl-acrylic flat, PVC = 60.5%)

Effect of CELLOSIZE HEC solution viscosity on latex paint Stormer viscosity (Rohm & Haas exterior all-acrylic flat, T-64-4, PVC = 40.0%)

Effect of CELLOSIZE HEC solution viscosity on latex paint Stormer viscosity (UCAR Emulsion Systems exterior all-acrylic flat, E-2437, PVC = 44.7%)

Paper Coatings — CELLOSIZE HEC increases the water retention of coating colors, particularly with coatings containing high proportions of latex, where the penetration of adhesive into the base sheet must be controlled. As a starting point, add about 0.5 to 1.0 percent of CELLOSIZE HEC QP 09, based on pigment. If higher viscosity can be tolerated, substitute CELLOSIZE HEC QP 3 or QP 40 for CELLOSIZE HEC QP 09.

The use of CELLOSIZE HEC also contributes to improved grease resistance. For oil- and grease-proof coatings, use about two pounds per 1000-square feet (10 grams per square meter) of surface. Coatings may be applied by blade, air-knife, or roll coating.

Inks — In ink manufacture, CELLOSIZE HEC is used for the production of waterborne duplicating inks that dry rapidly without setoff or bleeding.

Learn About Other Dow Products for Paints and Coatings

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