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In drying coatings, the time span between the deposition of the wet film andthe formation of an uniform solid harbors a procession of complex phenomenaeach of which carves the final properties of the dry paint film. Attaining abetter control of the drying process requires the availability of a tool thatallows monitoring the attending dynamics. The experimental access to thedynamics underlying the drying process is challenging as paint films are oftenopaque and the phenomena accompanying the drying process usually populate amultitude of time and length scales. To circumvent these obstacles we deployLaser Speckle Imaging (LSI) as a technique that allow us to quantitativelyprobe the internal dynamics of drying waterborne paints and unambiguouslydetermine a crucial handling parameter such as the open time. We develop a setof scaling relations which accurately predict the behavior of theexperimentally determined open time as a function of a parameter set thatgoverns the drying process. Additionally, we harness the big temporal dynamicrange of LSI to monitor phenomena that inhabit the later stages of the dryingprocess. Remarkably, we not only capture the film formation time, the timepoint in which phase inversion takes place, but also microscopically detect thedeformation of polymeric particles that precedes it.

Rapid and unambiguous determination of the open time for waterborne paint films with Laser Speckle Imaging