Stable nanoparticulate suspension and method for production

摘要

The invention relates to a stable, highly concentrated, aqueous suspension of nanoparticles, particularly of titanium dioxide particles, a method for production, and use of the suspension, e.g. for coating or impregnation, or as an additive in organic or inorganic matrices. The suspension contains a first dispersant based on a polymeric alkoxylate and a second dispersant selected from the group of amino alcohols. The suspension is preferably characterized by the fact that its stability is preserved even during and after vigorous dispersion in an attrition mill and no increase in viscosity occurs. In a preferred embodiment, the viscosity declines by up to 10 to 50% as a function of the milling time. In a further embodiment, the suspension can be dried and subsequently redispersed, without the state of dispersion deteriorating.

主权项

1. An aqueous suspension of nanoscale titanium dioxide particles comprising:
nanoscale titanium dioxide particles, wherein the titanium dioxide particles are from about 30 to about 60 weight percent of the suspension; a first dispersant based on a polymeric alkoxylate functionalized with phosphate; and a second dispersant selected from the group of amino alcohols; wherein the total amount of dispersants are from about 3 to about 40 weight percent of the suspension; wherein the pH of the suspension is from 4 to about 10.