The influence of surface physicochemistry of solid fillers on dispersion in polyurea systems
Marta Dobrosielska, Daria Pakuła, Bogna Sztorch, Maciej Popiół, Bartosz Klonowski, Dariusz Brząkalski, Bogdan Marciniec, Robert E. Przekop
Quarterly No. 2, 2019 pages 83-90
DOI:
keywords: polyurea, coating, filler, modification, dispersion
abstract Polyurea coatings are obtained by hydrodynamic spraying by means of high-pressure, spray-coatingequipment. A chemical reaction between the isocyanate and amine components occurs in the time of approximately 6 seconds, which enables use of the coated object almost immediately after coating application. Polyurea coating modification results in changes in their properties and a cost reduction. In this work modifiers such as expanded graphite, talc and chalk, which are inexpensive, easily commercially obtainable fillers were employed. The curing degree was measured by FT-IR spectroscopy, thermal stability by thermogravimetric analysis (TG) and phase transition temperatures by differential scanning calorimetry (DSC). For the systems stored under different conditions, the tensile strength and Shore hardness in the D scale were also measured. SEM/EDS analysis was performed to assess the dispersion of the modifiers in the polyurea coatings. To determine the hydrophobic-hydrophilic character, contact angle analyses were performed. The addition of the fillers improves some of the parameters, e.g. the thermal stability and mechanical properties.