Aqueous silicone dispersions, formulations, especially paint formulations, containing them and one of their methods of preparation

摘要

The invention relates to an aqueous silicone dispersion, containing one or more polyorganosiloxanes (POSs) intended to be crosslinked or having been crosslinked by elimination of water or alcohol, according to a polycondensation mechanism. The present invention also relates to methods for preparing aqueous silicone emulsions and dispersions.

主权项

1. A paint, comprising:
i) an aqueous silicone dispersion consisting essentially of:
a) at least one polyorganosiloxane resin (A) comprising condensable hydroxyl substituents present in an amount of at least 0.05% by weight, wherein the polyorganosiloxanes resin (A) is a hydroxylated methyl silicone resin, andwherein the polyorganosiloxane resin (A) is a liquid polyorganosiloxane resin of the type T(OH), DT(OH), DQ(OH), MQ(OH), MDT(OH), MDQ(OH), or mixtures thereof,wherein the siloxane units M, D, T, and Q are defined as follows, wherein R is methyl: b) at least one epoxy-functionalized polyorganosiloxane (B);c) at least one water-soluble hydroxylated alkylaminosilane (C) present in its monomeric form of general formula (I) and/or in a condensed oligomeric type form:
R1—[Si]—[OH]3  (I)in which formula:
—R1 is an aminoalkyl radical having 1 to 6 carbon atoms or a group of general formula: H2N—(CH2)xR2—(CH2)z—; with R2 representing O, S, —NH— or NH—CH2—CH2—NH— and x ≧2, z ≧2;d) at least one surfactant (S);e) optionally at least one biocide (D);f) water; andg) optionally an effective amount of a polycondensation catalyst;wherein said aqueous silicone dispersion does not contain a silane having hydrolyzable functional groups of alkoxy —OR type with R being a C1-C20 aliphatic hydrocarbon group, said silicone dispersion present in an amount up to 150% by weight relative to the total weight of one or more organic dispersions; ii) a siliceous or nonsiliceous filler, selected from the group consisting of:
precipitated silica, unprecipitated silica, colloidal or powdered silica, carbonates, talc, TiO2 and mixtures thereof; and iii) each of compounds a), b), c), and d) listed below:
a) one or more organic dispersions selected from the group consisting of (co)polymers of styrene and/or (meth)acrylic acid or a combination thereof;b) one or more thickeners selected from the group consisting of acrylic cellulose thickeners, polyurethanes, natural gums and mixtures thereof;c) one or more coalescents selected from the group consisting of organic solvents, glycols, aliphatic petroleum cuts and mixtures thereof;d) one or more wetting agents or dispersants selected from the group consisting of phosphates, polyacrylics and a combination thereof.