Water-based and solvent coatings have
significant various rheological behavior and
the analysis of their flow curve in function
of shear rate variation enables to perfectly
adjust their formulation in order that user
has the same easy of useand also to limit
the flowing too.
After quickly warming of 1 ml of sample at 23°C
with CP 4000 Peltier, start a flow curve from 0.5
to 1000 s-1 with software.
The issued Flow curve shows influence of shear
rate on the viscosity of sample.
The speed rampe nables to follow evolution of
viscosity from as we left from the pot (D < 2 s-1)
until a shear rate closed to this of
application (1000 s-1) and then compare
quickly and efficiently the products between them.
Solvent coating has a relatively flat profile, then its viscosity doesn’t change so much between rest state and application shearing.
The Water-based coating viscosity decrease a lot with a 6 times more higher at rest state and become so fluid through the shearing in order to give a 3 times lower viscosity under application (viscosity at 1000 s-1) than solvent one.
This shear-thinning behavior assure one application facility and warranty a good rest structure, symbolized by the Yield Value
of this product as indication of limit of flowing.