Nano-CaCO3 (nanometer calcium carbonate) composite acrylic coatings were prepared

and their application performance was tested.The result indicated that when the dosage of the modified nano-CaCO3 was 1.5%(mass)

the coatings were obviously improved in such properties as light resistance

water resistance

self-cleaning and storage stability.The effects of adding light calcium carbonate

unmodified nano-CaCO3

modified nano-CaCO3 into the acrylic coatings and its dosage on the rheological property were studied.The results showed that the rheological property of this system conformed to the Casson model.When the dosage of modified nano-CaCO3 was 1.5% (mass)

the coatings showed lower viscosity sensitivity to temperature

decreased viscosity

strong shear thinning ability

low Casson yield stress

and increased thixotropy

and the performance improvement was basically consistent with the change in rheological property.In addition

changing the solid content or adding butyl alcohol had basically the same influence on the rheological property of modified nano-CaCO3 composite acrylic coatings and the traditional acrylic coatings.