CS206105B1 - Basic anticorrosion coating substance for protection of the steel and galvanized surface - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a corrosion protection primer for steel and galvanized surfaces.

Known anticorrosion primers usually contain as active ingredient sulphate, zinc bile, calcium ortho-sulphate, zinc powder, zinc phosphate, hexavalent chromium compounds or other inorganic salts and oxides. Most of these substances are available on the market in limited quantities and, in addition, lead and hexavalent chromium compounds are toxic. Therefore, there is an effort to limit their content in paints to a technically and environmentally justified minimum.

This problem is solved and the above drawbacks are substantially eliminated by a primer anticorrosive coating for the protection of steel and galvanized surfaces, consisting of the organic binder, pigments and / or pins, according to the invention. The essence of the invention is that

The composition contains in the pigment part 1 to 20% by volume pigment concentration of the product salts obtained by reaction of unsaturated higher organic acids with 16 to 20 carbon atoms per molecule and 1 to 3 double bonds, eg oleic acid, with nitric acid above 55% by weight. . at a temperature of from 50 ° C to 100 ° C, these salts being obtained by reaction of the product with alkaline earth metal oxides, eg calcium oxide, or with soluble organic or organic salts. inorganic acids such as lead acetate. It is preferred that the anticorrosive primer further comprises 0.2 to 12 wt. metal oxides

206 105

208 103 alkaline earth, since the addition of these substances further increases its corrosion-inhibiting effect.

Accordingly, the coating composition of the present invention does not contain anticorrosive pigments replacing said compound, thereby saving deficient metals and improving the living and prone environment in the manufacture and application of the anticorrosion primer.

The effect of the invention has been verified by corrosion testing of steel in paint film extracts formed from paints containing an alkyd binder and an active anticorrosive component both with zinc bile and a compound of the invention. The results of these tests are given in the following table:

Table 1:

Protective properties of 10% aqueous leaches of a commercial paint containing zinc bile and a paint according to the invention as an anticorrosive pigment

Type of coating film Contents of Act. % by weight Corrosive decreases / Um PH leachate Polarization potential 10 µA / cm ² commercial 5% zinc yellow 5.0 4.7 540 model pattern 5% ^X 0.14 5.8 644 5% ^XX 0.15 4.7 654 _ »_ 5% ^{x +} + 2.5% CaO 0.09 6.1 654

X = calcium salt of a compound of the invention xx = lead salt of a compound of the invention

The invention is further illustrated by the following examples.

Example 1

The base paint containing inert pigments has the following composition: calcium salt of the reaction product

100 wt. parts of oleic acid with 180 parts of conc. nitric acid ferric oxide red talc micronized zinc white 50% solution of alkyd resin in white spirit modified 55% linseed oil 42.0 2% solution of naphthenate Co · in xylene 0.5% - - Pb - - 1.0

4.5 parts by weight «_ w ~ n _« _-

26.0

15.0

11.0

Example 2 ²⁰⁸ 105

Primer with inert pigments and calcium oxide

has the following composition: lead salt of the reaction product 100 wt. parts of oleic acid are 180 parts conc. nitric acid 4,5 part: wt. red iron oxide 26.0 - n - talc micronized 15.0 - II - zinc white 9.5 - M - calcium oxide 1.5 - M - 50% Ald resin solution in lacquer gasoline modified 55% linseed oil 42.0 n 2. A solution of naphthenate Co in xylene 0.5 - II - Pb-4 1.0 - n -

The invention can be used in all sectors of the national economy where it is necessary to protect steel and steel galvanized surfaces from corrosion.

Claims (1)

SUBJECT OF THE INVENTION An anticorrosive primer for the protection of steel and galvanized surfaces, consisting of an organic binder, pigments or fillers, characterized in that it contains in the pigment part 1 to 20% by volume pigment concentration of the product obtained by reaction of unsaturated organic acids with 16 to 20 carbon atoms atoms in the molecule and 1 to 3 double bonds, e.g. oleic acid, with nitric acid above 55% by weight; at a temperature of from 50 ° C to 100 ° C, these salts being obtained by reaction of the product with alkaline earth metal oxides, eg calcium oxide, or with soluble salts of organic and / or organic acids. inorganic acids, e.g., lead acetate. The anticorrosive primer according to claim 1, further comprising 0.2 to 12 wt. alkaline earth metal oxides.