Zinc rich paint vehicle
AssigneePQ Corporation
InventorsJames S. Falcone, Jr., Robert W. Spencer
Life of this patent
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Abstract
Aqueous organic ammonium silicate-alkali metal silicate combination vehicles for zinc-rich, corrosion-resistant paints are improved by the addition of organosilicone-silicate polymers. The improvement is manifested by increased adhesion to poorly prepared metal surfaces and harder paint films.
Claims8
In the aqueous vehicle suitable for forming zinc rich coatings comprising a soluble quaternary ammonium silicate containing 1 to 4 alkanol groups, alkali metal silicate, a thickening agent compatible with aqueous alkaline systems and water;
- the improvement consisting of an organosilicone-silicate polymer which consists of 10 to 90% of a siloxane group and 10 to 90% of an alkali metal silicate group having the general formula of:
- ##STR1## M represents sodium or potassium, R stands for a divalent hydrocarbon, R' represents a monovalent hydrocarbon group;
- b has a value of 1 to 3;
- c has a value of 0 to 2 and (b+c) has a value of 1 to 3.
An aqueous vehicle suitable for forming zinc rich coatings, consisting essentially of:
- (a) 30 to 45 parts by weight of an organic ammonium silicate selected from the group consisting of tetraethanolammonium silicate, methyltriethanolammonium silicate, dimethyldiethanolammonium silicate, diethyldiethanolammonium silicate, n-propyltriethanolammonium silicate, isopropyltriethanolammonium silicate and benzyltriethanolammonium silicate;
- said organic ammonium silicate containing between 5 and 22.5 moles of SiO.sub.2 per mole of quaternary ion and 25 to 55% solids;
- (b) 10 to 25 parts by weight of sodium silicate silicate solution with 1.5 to 4.0 moles of SiO.sub.2 per mole of Na.sub.2 O and 30 to 50% silicate solids;
- (c) 0.2 to 2.5 parts by weight of a thickening agent compatible with alkaline systems;
- and
- (d) 0.05 to 2.5 parts by weight of an organosilicone silicate polymer which consists of 10 to 90% of a siloxane group and 10 to 90% of an alkali metal silicate said siloxane group having the general formula of:
- ##STR2## M represents sodium or potassium, R stands for a divalent hydrocarbon, R' a monovalent hydrocarbon group;
- b has a value of 1 to 3;
- c has a value of 0 to 2 and (b+c) has a value of 1 to 3.
Dependencies are inferred from the claim text.