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Joel Schwartz
Lead Applications Chemist |
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I am formulating an industrial maintenance primer from a latex paint and have found that as I increase the anticorrosive pigment level, I get paint instability. Why does this occur and can Surfynol® additives help here? |
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To maximize film durability, latex producers often minimize the surfactant in their formulations. The addition of anticorrosive pigments can introduce multivalent ions which may cause latex instability. Surfactants, and additives in general, must therefore be chosen to perform multiple roles, such as providing latex stability to multivalent ions, in addition to pigment/substrate wetting. Research has shown that by using a dispersant (Surfynol CT-131), a defoamer (Surfynol DF-210) and a wetting agent (Surfynol 104DPM) in a concerted additives approach, that calcium silicate levels could be doubled, and zinc molybdenum phosphate levels tripled, with a resulting paint that had excellent in-can stability, accelerated oven storage stability and freeze-thaw stability. Other observed benefits of the concerted Surfynol additives approach included: reduced microfoam in airless spray, improved early adhesion and blister resistance and excellent substrate wetting. |
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