Method for the aqueous medium grinding of mineral materials and binders using a reverse emulsion of a polymer of acrylamide with an acrylic monomer

Abstract

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.

Description

technical field [0001] The present invention relates to the broad field of grinding of minerals in an aqueous medium in the presence of a binder. Background technique [0002] Mineral particles and polymeric binders are two basic ingredients used in the manufacture of many materials such as plastics. Mineral particles, such as calcium carbonate, contribute significantly to the mechanical and optical properties of the final product; as for the binder, usually in the form of an emulsion stabilized by surfactants, it provides the required cohesion of all components of the end material. [0003] For more than ten years, the following particle concept has been developed: it brings the properties of pigment and binder together in the form of an independent product: it is called "self-binding pigment particle". This product is obtained by grinding minerals in an aqueous medium in the presence of a polymeric binder. This method results in particles consisting of both binder and pi...

AI Technical Summary

Problems solved by technology

This foam has the disadvantage that it greatly impairs certain properties (in particular optical properties) of compositions made from aqueous suspensions of self-binding pigment particles

Finally, the document contains no teaching on how to solve the problem of foaming when the operation of grinding pigments and binders in an aqueous medium is completed

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