| Résumé : |
Each latex paint formulator, both experienced and novice, has encountered various kaolins in start point formulations, which are usually an additional filler, as a titanium dioxide substitution, sheen and gloss modifier of paints in the middle range of pigment volume concentration, or simply as an additional filler present in a formulation without indicating its special property to be added to it. For the latter reason, usually formulators of latex paints, not having sufficiently presented benefits of using a specific kaolin in the formulation, decide to replace it with other types of kaolin. Often, such a substitution is dictated by economic decisions, as the kaolin present in the stripe formulation may be more expensive than the one currently available for the production of current latex paints or requires an order as it has not been used in a given paint factory so far. Often, the lack of appropriate case studies showing the benefits of using this particular kaolin result in modification of the starting recipe in the direction of deteriorating the properties of the coatings, e.g. in terms of opacity, sheen and gloss, etc. Of course, such modifications are carried out mostly unconsciously, because the formulator intends to replace it with a different kaolin, which is assumed to be a similar kaolin that is currently used in production recipes. |
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How to characterise kaolin so that you want to use it in your formulation and buy it from the supplier in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 212, N° 4675 (06/2022)
