CS263422B1 - Anti-corrosion coating - Google Patents

Abstract

The composition of an anti-corrosion coating for surface abrasion of metals is disclosed. The coating contains pigments, fillers, binders, solvents and additives, and in its pigment part it contains 5 to 2.00% by weight, preferably 10 to 10% by weight, of a core lead pigment. A core lead pigment is understood to mean a substrate formed by particles of inert pigments containing a thin layer of lead on its surface.

Description

The invention relates to an anti-corrosion coating containing lead pigment, intended primarily for surface protection of large metal structures.

Paints with lead anti-corrosion pigments, especially powdered lead, lead ortho-lead and calcium ortho-lead, are known. Although the toxic properties of lead exclude these paints from use where compliance with safety regulations is not guaranteed, for technical purposes where long-term protective effectiveness of paints is required and where professional painting is guaranteed while complying with environmental requirements, these paints are still irreplaceable. However, their disadvantage is their high raw material requirements.

This deficiency of the known state of the art in the mentioned field is largely eliminated by the anti-corrosion coating material based on lead pigments, fillers, binders, solvents and additives according to the invention. The essence of the invention lies in the fact that the coating material contains in its pigment part 5 to 100% by weight, preferably 10 to 30% by weight, of core lead pigment, based on the weight of the pigment part. Core lead pigment is understood in particular as core lead, core lead - lead ortholead and core calcium ortholead.

A core lead pigment is a substrate formed by particles of inert pigment, for example calcium carbonate, calcium oxide, silicon dioxide, slate, etc., provided on its surface with a thin layer of lead, or antimony - lead ortholead or calcium ortholead.

The coating materials according to the invention will allow savings in production

263 42 paints contain a significant amount of lead, since the raw material for the production of core lead pigment is commonly used cheap inert pigments. Core lead pigment behaves in the paint film in the same way as compact particles of powdered lead. The durability and protective effectiveness of coatings made from these paints is comparable to those of paints containing powdered lead.

The invention and its effects are further described in more detail in the following specific embodiments. These examples of body compositions prepared according to the invention.

explained with examples, they indicate the composition, for example, 1

Primary paint with lead core

nuclear lead 35,- parts of matter talc 13,- ♦1 those titanium dioxide 10,- rt t* refined linseed oil 14,- rt those hard resin 14,- rt rt paint gasoline 12,- tt rt desiccant solution 2,- those rt

Example 2

Basic color with core vermilion

nuclear red 60,- parts of matter iron oxide reddish brown bentonite paste 70 ;ó wt.bento- 4,- 9« 99 thread 1,- 91 rt flaxseed meal 50% long flaxseed solution 19.3 99 those alkyds 12,- about 99 desiccant solution 3,- tt 19 additive 0.2 π 99

Example 3

Basic color with core calcium ortho-olivate

253,422

nuclear calcium ortholead 13,- parts mass vinyl chloride-vinylation copolymer m.p 20,- tt emollient 2.1 »1 methyl isobutyl ketone 34,- ’’ 1« toluene 30.9 « At Example 4 Base and top coat and core paint lead nuclear lead 23,- parts mass iron mica 14, - lt iron oxide red-brown 10,- lt bentonite 1,- ” tt refined linseed oil 12,- ’· tt chlorinated rubber 15,- * lt xylene 23,- ” lt desiccant solution 2,- tt

The effectiveness of the core lead pigment - lead on a silica carrier - in the model paint is demonstrated by the table containing the results of tests of the inhibitory properties of aqueous extracts of model paint films:

order no. * sample composition of pigment part % OKP pH of the aqueous extract ------ potential mV --------------- corrosion losses _from art. and” miner --1 i core.pigment day 1 Day 11 1 40 - 3.9 5.9 129 22.7 + 0.02 ^{x x /} 2 39 1 4.0 5.9 589 27.0 + 0.02 3 35 5 4.6 4.5 767 0.8 + 0.00 4 30 10 5.1 5.3 711 0.3 + 0.00 5 20 20 5.5 5.8 671 0.5ψ($.03 6 water - 6.2 6.3 - 35.3 + 0.09

*{ at anodic polarization with a current of lO^uA · cm” ² after 15 min. xx/ averages from three samples xxx^Z average from two samples

- 4 263 *22

Example 5

Base paint with low core lead content core lead 2.4 iron oxide 20, iron mica 20, bentonite 1, talc 4, refined linseed oil 12.6 chlorinated rubber 14, xylene 24, desiccant solution 2, The invention can be used in anti-corrosion coatings.

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in the chemical industry for production

Claims (1)

Anti-corrosive coating composition based on lead pigments, fillers, binders, solvents and additives, characterized in that it contains in its pigment part 5 to 100% by weight, preferably 10 to 30% by weight, of the core lead pigment, based on the weight of the pigment part.