RU2228942C1 - Composition for protecting corroded metal surfaces - Google Patents

Abstract

FIELD: corrosion protection. SUBSTANCE: cold-drying anticorrosive composition contains, wt %: chlorinated polyvinylchloride resin 6.0-9.0, glyphthalic acid 2.5-7.0, epoxide resin (ED-40) 0.8-2.0, chloroparaffin 1.5-4.0, tannin derivative as rust transformer, pigments 5.0-12.0, fillers 7.0-11.0, and organic solvents - the balance. Thus obtained homogenous composition shows elevated penetrating capacity towards corrosion products. EFFECT: increased rust transformation efficiency and increased adhesion to rusty surface resulting in enhanced protection of properties of lacquer surface and enabled applying composition above thicker rust layer. 2 tbl

Description

The invention relates to compositions of anticorrosive coatings of cold drying and can be used in the oil, gas, energy, chemical and other industries to protect the corroded surface of products and structures made of ferrous metals, operated in atmospheric conditions of various climatic zones, in an atmosphere containing aggressive gases and fumes in humid conditions and gasoline.

Known primer - rust modifier MS-0152 [TU 6-10-1729-79, a.s. SU 510496 A, 1976] based on a styrene-maleic anhydride copolymer containing pigments, a filler, phosphoric acid and solvents.

However, it has insufficiently high protective properties due to increased water absorption, is rapidly destroyed not only in water and chemically aggressive environments, but also when used as an independent coating in a normal atmosphere (for example, for temporary storage of metal).

Closest to the proposed one is a composition for application to corroded surfaces containing epoxy diane resin, phthalate type plasticizer, pigments, fillers, amine-containing hardener, rust converter, for example pyrocatechol, organic solvent, phenyl-containing polysiloxane resin, vinyl chloride and copolymer . RU 2174135 C1, publ. 09/27/2001].

However, it has low adhesion to a rusty surface, insufficient protective properties, and is not technologically advanced due to the two-component nature.

The problem to which the present invention is directed, is to obtain a single-component composition with increased penetrating (impregnating) ability with respect to corrosion products, as a result of which the rust conversion efficiency is increased, adhesion to a rusty surface is increased, which leads to an increase in the protective properties of the paint coating and provides the possibility of applying it over a thicker layer of rust.

The problem is solved by using a composition comprising a polymer based on vinyl chloride, an epoxy resin, a plasticizer, pigments, fillers, a rust converter, while it contains a polyvinyl chloride chlorinated resin as a polymer based on vinyl chloride, chlorinated paraffin as a plasticizer, and an epoxy as a plasticizer. E-40 resin, a tannin derivative as a rust converter and additionally contains glyphthalic resin in the following ratio of components, wt.%:

Polyvinyl chloride chlorinated resin 6.0-9.0

Gliftal resin 2.5-7.0

Epoxy resin E-40 0.8-2.0

Chloroparaffin 1.5-4.0

Pigments 5.0-12.0

Filler 7.0-11.0

Rust Converter -

tannin derivative 0.5-1.0

Organic solvents Else

As a filler, for example, microtalc, micronized mica, talc and others are used.

As pigments, zinc phosphate, zinc tetraoxy chromate, red iron oxide and others are used.

Chloroparaffin, for example, HP-470 grade, is used as a plasticizer.

As the polyvinyl chloride chlorinated resin, a resin of the PSX LS brand is used (OST 6-01-37-88).

Xylene, butyl acetate, acetone and others are used as organic solvents.

As glyphthalic resin, resins of the ФК-42 (ТУ 6-10-1441-79), ФЛ-390 (ТУ 6-10-1384-73) brands are used.

Derivatives of tannin, sold under the trade names “Korrodur” of Schwegmann (Germany), Alkofor AS of Cognis (Germany), are used as a rust converter.

As the epoxy resin used resin E-40 TU 2225-155-05011907-97.

The technology for preparing the composition according to the invention is as follows. Dissolve the chlorinated polyvinyl chloride resin in a mixture of organic solvents. Dispersed pigment paste, consisting of glyphthalic resin, chloroparaffin, pigments and filler in a bead mill. When compiling the composition, the disolver is loaded: a solution of polyvinylchloride chlorinated resin, a pigment paste, mica, a rust converter and mixed for 30 minutes.

Examples of compositions according to the invention are shown in table 1, the properties of the coatings in table 2.

For comparative tests, we used samples of steel grade St.3 of size 50 × 50 × 1, coated with a uniform layer of corrosion products tightly adhered to the substrate. The thickness of the rust layer was 35-60 microns, 70-100 microns.

The results of the tests are presented in table 2. These tables show that the proposed composition surpasses the known composition according to patent 2174135 in terms of drying time, adhesion to a rusty surface and protective properties.

Claims (1)

Composition for protecting corroded metal surfaces, including vinyl chloride-based polymer, epoxy resin, plasticizer, pigments, fillers, rust converter, organic solvents, characterized in that it contains a vinyl chloride-based polymer - polyvinyl chloride chlorinated resin, as an epoxy resin - epoxy resin E-40, as a plasticizer - chloroparaffin, and as a rust converter - a derivative of tannin and additionally glyphthalic resin in the wake the ratio of components, wt.%: Polyvinyl chloride chlorinated resin 6.0-9.0 Gliftal resin 2.5-7.0 Epoxy resin E-40 0.8-2.0 Chloroparaffin 1.5-4.0 Rust Converter - Derived Tannin 0.5-1.0 Pigments 5.0-12.0 Fillers 7.0-11.0 Organic solvents Else