T. Svanholm et al., ADSORPTION STUDIES OF ASSOCIATIVE INTERACTIONS BETWEEN THICKENER AND PIGMENT PARTICLES, Progress in organic coatings, 30(3), 1997, pp. 167-171
Citations number
12
Categorie Soggetti
Chemistry Applied","Materials Science, Coatings & Films
Adsorption of a HEUR thickener and a HMHEC thickener have been studied
on two titanium dioxide pigment grades with and without dispersant pr
eviously adsorbed. One of the pigments had an acidic surface, mainly s
ilica, and the other a more basic alumina/zirconia surface, Both assoc
iative thickeners adsorbed on pigments having a partially hydrophobic
(a-olefinic-maleic acid co-polymer) dispersant preadsorbed on the surf
ace. No adsorption rakes place when sodium hexametaphosphate, a highly
charged low molecular weight inorganic dispersant, was used, The alph
a-olefinic-maleic acid co-polymer dispersant is shown to adsorb on a n
egatively charged silica surface. This is assigned to hydrogen bonding
between unionised carboxylic groups from the dispersant and oxide ion
s on the pigment surface. (C) 1997 Elsevier Science S.A.