| Autor: |
Karakaş, Fırat, Hassas, Behzad Vaziri, Tekeli, Huriye, Güven, Onur, SabriÇelik, Mehmet |
| Předmět: |
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| Zdroj: |
Conference Proceedings of the International Symposium on Innovative Technologies in Engineering & Science; 2015, p1336-1343, 8p |
| Abstrakt: |
Nowadays, the search for new types of industrial minerals for use as pigment and extender in paint is considered as an important research area in surface chemistry applications. Since some functional minerals can improve both optical and mechanical quality of the paint, great research efforts are made to develop substitutes for relatively expensive pigment, TiO2. Although it may possible to make direct replacement of TiO2 by a synthetic opaque pigment, its feasibility has not been demonstrated. New trends prefer this replacement by performing some new particle preparation methods for paint. Efficiency of the replacement may require the use of natural extenders and pigments provided that some surface chemistry parameters including adsorption, electro-kinetics and rheology of the suspension are carefully adjusted. In this study, naturally ground calcitewith 5 μm mean size and paint grade 0.3 μm mean size TiO2 were premixed in an attritor in the absence and presence of varying amounts of sodium polyacrylate (NaPAA) as dispersant. The product obtained out of this interaction was fed as a composite material to the paint system. A direct relationship between the amount of NaPAA and opacity of the paint was found. Increasing the amount of NaPAA resulted in increased opacities and gloss values of the paint to a certain point above which both opacity and gloss started to decrease. The optimum amount of NaPAA was identified as 2.78 mg/g (NaPAA /pigment). Opacity and gloss value of the paint respectively increased by 0.56 % and 8 gloss units upon the addition of optimum amount of NaPAA during the premixing of calcite and TiO2 in the attritor. Interestingly, if the same amount of NaPAA is added while the production of paint instead of premixing stage, no such increment in the paint quality was observed. Moreover, no change in paint quality was found without NaPAA addition to the premix in attritor. These results clearly show the effect of order of addition in which introduction of a surface active component to TiO2 and calcite before the paint production significantly improved physical and chemical interactions. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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