White Color Aluminium Oxide For Cast Coated Paper

Application of modified nano-alumina in paper coating pigment

Nano-alumina is an important inorganic pigment. At present, it has been widely used in color inkjet printing paper coatings

due to its large surface area, low density, high whiteness, soft structure, and good printing performance. Nano-pigments refer

to pigments with a particle size of 1~100 nm. The gloss and ink density of coated paper with alumina as pigment are higher

than those of other pigment-coated papers. This shows that the use of nano-alumina pigments in coating can greatly improve

the grade and market competitiveness of coated paper.

Problems in use The biggest problem with nano-alumina pigments is the stable dispersion problem in the coating. This is because

the specific surface area and surface tension of nanoparticles are large, and they are easily adsorbed and agglomerated. In

water-based coatings, the high surface energy and specific surface energy of nano-alumina pigments will strongly adsorb water

and other media and react to form R-OH structures, which increases the interaction between nano-pigments and their surface activity;

and R-OH is prone to polymerization or the formation of new connectors, which makes nano-pigments and slurries more likely to agglomerate,

thereby affecting their dispersibility.

 Anticorrosion Pigments, Inkjet Receptive Coating, Matting Agent