Global ETD Search

1	Impact of Particle Morphology on the Rheology of PCC-Based Coatings Michel-Sanchez, Enrique 18 May 2005 (has links) The impact of particle size, size distribution, and particle shape on the rheology of precipitated calcium carbonate (PCC) based coatings was studied. Evaluating the interactions between different particle sizes and shapes leads to a better understanding of the packing fraction of PCC. HIgh packing fraction is desirable because of the positive impact on the fluidity of suspensions. Suspension with higher levels of fluidity can potentially load larger amounts of solids while keeping low viscosities. High solids suspensions are key factors to improve the efficiency of coating processes. To address this issue, PCC of different sizes and shapes where mixed in different ratiosto find mixtures with higher packing fractions that could result in coatings with lower viscosities. When coatings containing 90% of large particles and 10% by weight of small particles of different shape, viscosity decreases by 50% for one combination. The effect is caused by the higher packing fraction achieved. Future research is also described here. Albagloss Precipitated calcium carbonate Combination ratio Viscosity Paper coatings Rheology PCC Pigments Pigment combinations Opacarb Shape combinations Rheology of coatings Rheology Calcium carbonate Paper coatings Particles Precipitation (Chemistry)