The way to protect and restore corroded metallic surfaces

 

The invention relates to the field of protection of metal surfaces and restore corroded surfaces, working in conditions of abrasive wear, corrosive environments, for example when transporting fertilizers, energy, chemical and mining industry, the repair of corroded equipment and to protect it. The method comprises applying on the net or on the rusty surface of the primer based on the composition containing epoxy resin, pigments, fillers, curing agent, organic solvent, followed by drying "up tack-free surface, applying an insulating layer of the composition containing epoxy resin, pigments, fillers, curing agent, iron oxide, organic solvents, coating the outer layer of the composition containing epoxy resin, pigments, fillers, curing agent, an organic solvent. The outer layer may additionally contain iron oxide. All layers enter the hardener brand Cardolite NC 562 on the basis of 3-n-pentadecanolide and epoxy resin with an epoxy equivalent weight of 450-500. The technical result consists in increasing the corrosion resistance of the coating. 1 C.p. f-crystals, 1 table.

Image the aqueous wear, the influence of aggressive media, for example, during transportation of fertilizers, energy, chemical and mining industries.

There is a method of protecting metal surfaces based on epoxy resin, polyethylenepolyamine as a hardener and fillers.with. 691447, MKI C08 L 63/02, SC 3/18, publ. in BI 38-1979 year).

However, it does not provide comprehensive protection of metal surfaces.

Closest to the present invention is a method for the protection and recovery of metal surface by applying a primer layer comprising an epoxy resin with an epoxy equivalent weight of 190-200, polyethylenepolyamine as a hardener, oxide, after drying it to "tack-free" insulating layer comprising an epoxy resin, polyethylenepolyamine, bakelite varnish, diabase powder, aluminium oxide, glass fiber, and then the surface is dried up "tack-free", will also cover the plasticizing layer comprising epoxy resin, polyethylenepolyamine, the dispersion of the iron red lead in linseed oil, acetone, after which the dried coating to fully cure the [U.S. Pat. EN 2147027, publ. 27.03.2000, 09D 5/08].

However, this method provides insufficient protective properties of the coating.

Technical practical result is achieved by that way protection and restoration of corroded metallic surfaces, comprising applying a primer layer on the base composition containing epoxy resin and a curing agent, followed by drying "up tack-free surface, applying an insulating layer of the composition containing epoxy resin, curing agent, followed by drying "up tack-free", the application of the outer layer containing the epoxy resin, hardener, pigment, organic solvent, followed by drying to complete curing, characterized in that the composition of the primer impose additional pigments and fillers and organic solvents, the composition of the insulating layer further added pigments, fillers, iron oxide and organic solvents in the composition of the outer layer further added fillers, modified polysiloxane, and as a hardener in all layers enter the hardener brand Cardolite NC 562 on the basis of 3-n-pentadecanolide, and as the epoxy resin in all layers epoxide Dianova resin with an epoxy equivalent weight of 450-500, in the following ratio of components in layers: in the composition of the primer, wt.%: Epoxy Dianova resin with an epoxy equivalent in the a - 6,0-12,0 Organic solvents Else in the composition of the insulating layer, wt.%: Epoxy Dianova resin with an epoxy equivalent weight of 450-500 - 20,0-35,0 Pigments - 5,0-10,0
Fillers - 5,0-12,0
Hardener brand Cardolite NC 562 on the basis of 3-n-pentamethylene - 6,0-12,0
Iron oxide - 10,0-30,0
Organic solvents - Rest
in the composition of the outer layer, wt.%:
Epoxy Dianova resin with an epoxy equivalent weight of 450-500 - 20,0-30,0
Pigments - 10,0-15,0
Fillers - 15,0-25,0
Hardener brand Cardolite NC 562 on the basis of 3-n-pentamethylene - 6,0-12,0
Organically modified polysiloxane - 0,2-0,6
Organic solvent - Rest
The outer layer may additionally contain iron oxide in the amount of 10-30 wt.%.

As epoxy Dianova resin use any epoxy Dianova resin with an epoxy equivalent weight of 450-500, for example ED-8 GOST 10587-84, e-R THE 6-10-607-78, e-41 THE 6-10-1316-84 etc.

As pigments used chromium oxide, crown zinc, strontium and lead, blue phtalocyanines, red iron oxide, titanium dioxide, carbon technical and other

As fillers used the micro-talc, omyacarb, mikrobasic, talc and others.

As the quality of organically modified polysiloxane use different organically modified polysiloxane (modified acrylic resins, epoxy and others), but mainly brand EFKA-3033 company EFKA, the Netherlands, or BIK-341, BIC-344 firms BYK-Chemie, Germany, representing a solution of the modified simple polyester copolymer dimethylpolysiloxane.

As the iron sludge in this invention to use any iron oxide, for example:
a) oxide brand Miox firmMontanindustrie (Austria) containing Fe2O385-94%, Al2About32-3%, MgO 1-2%, Sa 0.3 To 1%, SiO23-6%, Pb<0<1%;
2About390-95%.

As organic solvents used xylene, acetone, ethyl cellosolve, butyl acetate.

Protection and restoration of metal surfaces (steel, carbon steel, stainless steel, aluminium, its alloys and etc.), equipment operating in the conditions of abrasive wear in aggressive environments is carried out by applying to the surface of the combined coating that consists of three layers:
the first layer provides adhesion of the composition to a metal surface and corrosion protection, the coating can be a layer of corrosion thickness up to 50 microns;
- the second layer has the main shock and corrosion load;
- the third layer provides the appearance of the coating and which accordingly.

Example 1. Drawing on aluminium.

Originally applied primer composition, %:
Epoxy Dianova resin with an epoxy equivalent weight of 450 - 30,0
Pigments: titanium dioxide - 6,0
Strontium chromosomally - 6,0
Fillers: micro-talc - 6,0
Mikrobasic - 19,0
Hardener brand Cardolite NC 562 on the basis of 3-n-pentadecanolide to 12.0
Organic solvents: xylene - 10,0
The ethyl cellosolve - 8,0
Acetone - Rest
The composition for the first layer coating is prepared by mixing dissolvere part epoxy resin and organic solvents with pigments and fillers, dispersing the resulting paste on a bead mill and the preparation of the composition by adding a pigment paste the residual amount of the solvent and epoxy resin and mixing until smooth. The resulting composition is combined with a hardener and applied to corroded (permitted layer corrosion up to 50 μm) surface by brush or by means of air or bezuderzhnogo spray. The primer layer is dried "up tack-free", then put the insulation layer of the following composition, wt.%.

Epoxy Dianova resin with an epoxy equivalent weight of 500 30,0
Pigments: titanium dioxide, Titania the basis of 3-n-pentamethylene - 12,0
Iron oxide brand Miox - 10,0
The ethyl cellosolve - 10,0
Xylene - 8,0
Acetone - Rest
The composition for an insulating layer is prepared as follows: a solution of epoxy resin in an organic solvent are mixed in disolver with pigments and fillers, and then dispersed in a bead mill, then make up the composition in the mixer, equipped with a stirrer, add remaining solvent and epoxy resin and iron oxide and mix all until smooth within 30 minutes. Add the hardener. The composition is uniformly applied on the primer layer and dried to "tack-free", then apply the outer third layer composition, wt.%:
Epoxy resin with an epoxy equivalent weight of 500 to 20.0
Pigments: chromium oxide - 13,0
CZK lead lemon - 1,85
Blue phtalocyanine - 0,15
Fillers: talc - 5,0
The micro-talc - 15,0
Organically modified polysiloxane EFKA 3030 - 0,2
Hardener brand Cardolite NC 562 on the basis of 3-n-pentamethylene - 8,0
Xylene - 8,0
The ethyl cellosolve - 6,0
Acetone - Rest
The outer layer is prepared by mixing the epoxy resin, pigments, fillers, organic solvents in disolver and dispersion in a bead mill, satski modified polysiloxane within half an hour until smooth. Add the hardener. The composition is uniformly applied on the insulating layer. The drying time of the combined coverage of all layers up to degree 3 at 20oWith 24 hours. The protective coating used for painting of wagons-wagons.

Example 2. Steel is applied primer composition, wt.%:
Epoxy Dianova resin with an epoxy equivalent weight of 500 to 20.0
Pigments: zinc phosphate - 14,5
Titanium dioxide - 10,0
Technical carbon - 0,5
Fillers: micro-talc - 12,0
Oommercial brand Cardolite NC 562 on the basis of 3-n-pentamethylene - 6,0
Organic solvents: ethyl cellosolve - 16,0
Xylene - 14,0
Acetone - Rest
Then put the insulating layer composition, wt.%:
Epoxy Dianova resin with an epoxy equivalent weight of 500 to 20.0
Pigments: red iron oxide - 10,0
fillers: talc - 2,0
The micro-talc - 3,0
Hardener brand Cardolite NC 562 on the basis of 3-n-Penta-decantera to 12.0
Iron oxide Altai Ore deposits Log 30,0
Organic solvents: xylene - 8,0
The ethyl cellosolve - 8,0
Acetone - Rest
Then apply the outer layer composition, wt.%:
Epoxy Dianova resin with an epoxy equivalent weight of 450 - 25,0
Pigments: chromium oxide - 10,0< the - 6,0
Iron oxide Altai Ore deposits Log of 20.0
Organically modified polysiloxane EFKA 3033 - 0,2
Organic solvents: xylene - 8,0
The ethyl cellosolve - 8,0
Acetone - Rest
The drying time of the combined three-layer coating to grade 3 at 20oWith 24 hours.


Claims

1. The way to protect and restore corroded metallic surfaces, comprising applying a primer layer on the base composition containing epoxy resin and a curing agent, followed by drying to a tack-free surface, applying an insulating layer of the composition containing epoxy resin, curing agent, followed by drying to a tack-free surface, applying a coating containing epoxy resin, hardener, pigment, organic solvent, followed by drying to complete curing, characterized in that the composition of the primer impose additional pigments, fillers and organic solvents, the composition of the insulating layer is additionally injected pigments and fillers, iron oxide and organic solvents in the composition of the outer layer further added fillers, modified polysiloxane and CAE epoxy resin epoxide Dianova resin with an epoxy equivalent weight of 450-500, in the following ratio of components in layers:

in the composition of the primer, wt.%:

Epoxy Dianova resin with an epoxy equivalent weight of 450-500 20,0-30,0

Pigments 12,0-25,0

Fillers 12,0-25,0

Hardener brand Cardolite NC 562-based 3-n pentadecanolide 6,0-12,0

Organic solvents Else

in the composition of the insulating layer, wt.%:

Epoxy Dianova resin with an epoxy equivalent weight of 450-500 20,0-35,0

Pigments 5,0-10,0

Fillers 5,0-12,0

Hardener brand Cardolite NC 562-based 3-n pentadecanolide 6,0-12,0

Iron oxide 10,0-30,0

Organic solvents Else

in the composition of the outer layer, wt.%:

Epoxy Dianova resin with an epoxy equivalent weight of 450-500 20,0-30,0

Pigments 10,0-15,0

Fillers 15,0-25,0

Hardener brand Cardolite NC 562-based 3-n pentadecanolide 6,0-12,0

Organically modified polysiloxane 0,2-0,6

Organic solvents Else

2. The method according to p. 1, wherein the outer layer further comprises an iron oxide in the amount of 10-30 wt.%.

 

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