Method for grinding minerals and binders in aqueous media using an inverse emulsion of a polymer of acrylamide containing acrylic monomers

摘要

Preparing self-binding pigmentary particles, dry or in suspension or aqueous dispersions, comprises forming aqueous suspensions of pigmentary material, forming solutions or suspensions or aqueous emulsions of binder, co-grinding aqueous suspensions with solutions or suspensions or aqueous emulsions to obtain self-binding pigmentary particles, optionally co-grinding aqueous suspension with solutions or suspensions or aqueous emulsions, optionally increasing concentration of aqueous suspension, optionally dispersing aqueous suspension and optionally drying aqueous suspension. Preparing self-binding pigmentary particles, dry or in suspension or aqueous dispersions, comprises: forming one or more aqueous suspensions of pigmentary material and introducing the material in a mill, for co-grinding; forming or taking one or more solutions or suspensions or aqueous emulsions of a binder and/or forming or taking one or more dry binders and introducing in the mill, for co-grinding; co-grinding the obtained aqueous suspensions with the solutions or suspensions or aqueous emulsions and/or the obtained dry binders to obtain aqueous suspension of self-binding pigmentary particles; optionally co-grinding the aqueous suspension with solutions or suspensions or aqueous emulsions of binder; optionally increasing the concentration of the aqueous suspension obtained in co-grinding step or optional co-grinding step by thermal and or mechanical concentration; optionally dispersing the aqueous suspension by providing a dispersing agent; and optionally drying the aqueous suspension obtained in co-grinding step, optional co-grinding step, optional increasing step or optional dispersing step, where invert emulsion is formed from a dispersion in an oily phase of water and acrylamide polymer particles with an acrylic monomer, which is introduced in the process after, before and/or during co-grinding step and optional co-grinding step, preferably after optional drying step.