Acrylic and oil-based paints have different rheological properties and identifying their behavior based on shear rate means their formulations can be perfected so that users still fi nd them easy to use and so that the product does not drip.
After quickly warming of sample inside gap of measuring system cone-plate CP4020 using a temperature control system integrated in the Air-Air Peltier Effect at 23°C, a fl ow curve from 0.5 to 1000 s-1 is started using the Rheomatic-P software. The resulting rheogram shows the infl uence of shear rate on a product’s viscosity.
The speed curve tracks the changes in viscosity from being taken out of the pot (D < 2 s-1) up to a shear rate similar to that of application (1000 s-1) and thus can compare the products quickly and effi ciently.
Oil-based paint has a relatively fl at profi le; its viscosity does not change much between rest state and application. The viscosity of acrylic paint, 6 times higher at rest, becomes a lot more fl uid under shearing and becomes 3 times more fl uid than oil-based at 1000 s-1. This shear-thinning behaviour ensures easy application and guarantees good structure at rest, symbolised by the product’s yield stress which is an indication of its drip-resistance.
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