What is Rhodoline® OTE-500?
Rhodoline® OTE-500 is a patented novel additive that can be added to coating formulations to increase open time. It is APEO-free, VOC-free and is a sustainable and Ecolabel compliant solution for water-based coatings. Rhodoline® OTE-500 improves colloidal/dispersion stability in coatings. The chemistry of Rhodoline® OTE-500 is patented and proprietary in nature.
How is open time evaluated?
The open time of formulated paints & coatings is measured according to an Open Time Test Method - ASTM standard test method WK 13360.
Since Rhodoline® OTE-500 extends open time, does it delay drying time as well?
Based on our evaluation, Rhodoline® OTE 500 extends open time, but it does not delay drying time. The concept of open time and drying time is at different stages in the film formation process. We actually have observed that Rhodoline® OTE 500 could reduce the drying time of coating films.
Are there any other coating properties improved by using Rhodoline® OTE-500?
Depending on the formulation, in addition to open time, Rhodoline® OTE-500 also increases gloss (for high sheen paints), freeze-thaw stability, stain resistance (hydrophobic stains), pigment dispersion and colorant acceptance without any adverse effects on the resulting films. Use of Rhodoline® OTE-500 can also help to reduce/eliminate wettings agents used in coatings formulations.
Are there any detrimental effects of Rhodoline® OTE-500 to the paint or resulting coating film?
One significant effect that we have observed in most coatings formulations is the reduction in formulation viscosity; especially when Rhodoline® OTE-500 is post added rather than formulated into the coating system. However, this can be fixed by either reducing the amount of other surface active additives in the formula or modifying the rheology package used – minor modifications in the coating formulations. In some formulas, we have also observed that a loss in scrub resistance was observed when Rhodoline® OTE-500 was used as a post-formulation additive. Again this can be due to the overloading of surfactants in the paint. This can be remedied by reducing the other surface active agents as well as dispersing aids in the formula. It is imperative that the use level of Rhodoline® OTE-500 in any coating formulation be optimized to avoid any significant impact on the coating dry film properties.
Does this additive hurt block resistance in films? Explain.
Our results with various binder systems indicate that Rhodoline OTE 500 does not have a significant impact on block resistance of the coating. However, exceeding the recommended dosage can lead to adverse effects.
Does Rhodoline® OTE 500 improve heat age stability of latex paints?
Our results have indicated that Rhodoline® OTE 500 improved the heat aged stability of waterborne paints. Again, results are formulation dependent.
Does Rhodoline® OTE 500 improve TiO2 dispersion or increase tint strength?
Rhodoline® OTE-500 improved TiO2 dispersions and enhanced tint strength of paints. Equivalent hiding or in some cases better hiding was observed when this additive was used in the formulation. Again, results are formulation dependent.
When Rhodoline® OTE-500 is added to low sheen paints such as matte, flat or egg-shell, does the enhanced dispersion stability interfere and exhibit higher unacceptable gloss than comparable formulations that do not contain Rhodoline OTE-500?
Improvement in gloss is only observed for higher sheen paints. For lower sheen paints addition of Rhodoline® OTE-500 does not significantly increase the level of gloss in these paints.
Have you tested Rhodoline® OTE-500 in paints that are tinted? Does it affect color acceptance?
When Rhodoline® OTE-500 was added to tinted paints it was observed that color development was improved, especially when organic colorants were used. Reduction or total elimination of wetting agents in the base paint can be realized upon careful optimization.