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Article Dans Une Revue Polymer Engineering and Science Année : 2017

Rheology of Plastisol Formulations for Coating Applications

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Résumé

A plastisol is a suspension of PVC particles and mineral fillers in a liquid phase composed of plasticizer and adjuvants. Plastisol formulations are commonly used in coating processes for flooring application. In the knife-overroll process, they are subjected to a wide range of shear rates (0–105 s21). They are adjusted in order to fulfil the target end-use properties but their processability depends on their rheology. Plastisol based on three PVC resins with or without mineral filler have been investigated using a Couette device and a capillary rheometer. Results show a high impact of PVC particle content, particle sizes and distribution on rheology: a polydisperse formulation displays a shear-thinning behavior in the whole shear rates range and exhibits yield stress; a monodisperse formulation shows a shear thinning behavior at low shear rate, followed by a Newtonian plateau, then a more or less pronounced dilatancy peak depending on plasticizer rate and finally another shear-thinning behavior; a bidisperse resin stands in between. Filler content also impacts the rheology: shear thickening effects at intermediate shear rates decrease or even disappear; however, the viscosity increase is important for low shear rates and depends on the filler particle size and particle size distribution.
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Dates et versions

hal-01395099 , version 1 (10-11-2016)

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Yamina Abdesselam, Jean-François Agassant, Romain Castellani, Rudy Valette, Yves Demay, et al.. Rheology of Plastisol Formulations for Coating Applications. Polymer Engineering and Science, 2017, 57 (9), pp.982-988 ⟨10.1002/pen.24475⟩. ⟨hal-01395099⟩
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