Effect of acrylic binder type and calcium carbonate amount on paint properties

 
The final price of water-borne paints can be reduced by the addition of fillers without significant losses of the films properties up to a certain amount of filler addition. Therefore it is important to study the interaction between binders and fillers and to determine which the maximum filler capacity for each system is. For this, high solids content waterborne paints based on filler/polymer latex blends have been prepared using only a dispersing agent as additive and the effects of several variables (latex type, their surface coverage, particle sizes and filler/latex ratio) on the film properties (scrub resistance, tensile properties, water uptake, gloss and weathering) have been investigated. Calcium carbonate (CaCO3) and poly(methyl methacrylate-co-butyl acrylate) P(MMA/BA) have been used as extender and latex respectively and sodium polyacrylate (NaPA) as dispersing agent.