CS230937B1 - Basic anticorrosive coating - Google Patents

Abstract

The invention improves known anti-corrosion primers for the protection of metal surfaces. The composition according to the invention based on zinc, pigments, fillers, binders, solvents and additives contains 5 to 67, preferably 17 to 35 parts by weight. of a core inorganic pigment provided with a zinc phosphate coating in an amount of 5 to 30% by weight, based on the weight of the core pigment, 2 to 35 parts of a filler, e.g. talc, 17 to 30 parts of a binder, e.g. alkyd resin, 9 to 33 parts of a solvent, e.g. white spirit, and 3 to 15 parts of additives. An increased anti-corrosion effect is achieved by adding 0.2 to 12 parts of reactive components containing oxides, hydroxides or carbonates of metals from the zinc, magnesium and calcium groups. Parts are understood as parts by weight.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a primer for the protection of metal surfaces.

As a primer, anticorrosive coatings ee use coatings based on oils, oil-resins, polyester resins and vegetable oil or fatty acid content thereof, epoxy and epoxy ester resins, or combinations thereof with chlorine gums and other polymers and polyaducts, as well as aqueous polymer dispersions.

The active anticorrosive pigments used in these coatings are lead compounds, zinc chromates and phosphates, boron compounds, possibly metallic dust - zinc, lead, etc. In addition, the paints may contain corrosion inhibitors such as fatty acid amides, aromatic nitro compounds and salts of their acids. In addition, the paints contain other pigments and fillers, additives and solvents.

Anti-corrosive pigments based on lead compounds can also be used in the form of a core pigment on a silicate core, even in combination with hexavalent chromium compounds. The known anticorrosive primer improves the zinc, pigment, filler, binder, solvent and additive primer according to the invention. The substance of the invention is characterized in that the composition comprises 5 to 67 parts by weight, preferably 17 to 35 parts by weight, of a core inorganic pigment coated with zinc phosphate in an amount of 5 to 30% by weight. 2 to 35 parts by weight based on the weight of the core pigment; fillers, e.g. micronized telco, 17 to 30 parts by weight; binders, not. 9 to 33 parts by weight of alkyd resin; 3 to 15 parts by weight of a solvent such as white spirit; additives, based on the total weight of the paint. An increase in inhibitory effect is obtained if the coating composition further comprises 0.2 to 12 parts by weight. reactive components comprising oxides, hydroxides or carbonates of at least one metal selected from the group consisting of zinc, magnesium and calcium. The presence of the reactive component in certain types of binders will allow the optimum pH of the non-diffused water to be achieved; this value is important for the application of the inhibitory properties of the core pigment surface layer, respectively. reaction product and reactive binder.

The basic anticorrosive coating composition according to the invention is intended especially for steel, aluminum and zinc surfaces exposed to common atmospheres, resp. and permanent humidity. It is economically more advantageous than the known anticorrosive paints with pure zinc phosphate - savings of up to 90% phosphate, while other components, especially inert pigments, are economically available. Its anticorrosive activity is the same as when using pure zinc phosphate and achieves very good hiding power.

The invention is further explained in more detail by way of description of examples of a possible specific embodiment thereof. As a solvent, white spirit, toluene, xylene, and the like can be used. 1 water, such as cobalt, lead, manganese or naphthenate or oleate additives; other substances used for this purpose.

Example 1 of a mica-based core pigment with 30% zinc phosphate talc micronized iron oxide / carbon black mixture of medium oil length alkyd and chlocaubber additive solvent

d.

d. 11 d.

d. 33 d.

d.

The coating composition of this composition is particularly suitable for protecting a steel surface in a permanently damp environment.

Example 2 of a precipitated barium sulfate core pigment

d. 35 d.

T1C> 2 β 15% zinc phosphate (Blanc fix) This composition is suitable for permanently wet environments, for protection of zinc surfaces.

zinc oxide alkyd resin modified with linseed oil additive solvent

Paints, especially aluminum and

Example 3 FegOj-based core pigment with 15% zinc phosphate talc ground milled calcium hydroxide mixture of a short castor elide and melamine formaldehyde condensate additive solvent

d. 20 d. 13 d. 6 d.

25 d. wt. 9 d. wt. 3 d. wt. 30 d. wt. 30 d. wt. 3 d. wt.

This coating composition is suitable for permanently damp environments to protect steel surfaces.

Attaches a kaolin-based core pigment with 5% zinc phosphate talc micronized magnesium carbonate epoxy resin in admixture with additive solvent phthalic anhydride (Idazox 2-0)

This composition is designed to protect steel in common types of atmospheres

Example 5 TiOg-based core pigment with 25% zinc phosphate precipitated barium sulfate (Blanc fix) dispersion of styrene-acrylate solvent additive

d. 2 d. 1 d.

d. 9 d, wt. 4 d.

d. 10 d. 20 d. 20 d. 15 d.

The coating composition of this composition is particularly suitable for the corrosion protection of aluminum and zinc surfaces in a normal atmosphere.

Claims (1)

A basic anticorrosive coating composition based on zinc, pigments, fillers, binders, solvents and additives, characterized in that it contains 5 to 67 parts by weight, preferably 17 to 35 parts by weight. % of an inorganic pigment coated with zinc phosphate in an amount of from 5 to 30% by weight, based on the weight of the core pigment; fillers, for example micronized talc, 17 to 30 parts by weight of the composition; binders, e.g. alkyd resins, 9 to 33 parts by weight; 3 to 15 parts by weight of a solvent such as white spirit; additives, based on the total weight of the coating composition, and optionally further comprising 0.2 to 12 parts by weight. reactive constituents containing oxides, hydroxides or carbonates of at least one of the group of metals including aine, magnesium and calcium.