Method of protection and reduction of the corroded metallic surfaces

FIELD: chemical industry; mechanical engineering; extractive industry; heat and power industry; other industries; methods of protection and recovery of the of the corroded metallic surfaces.

SUBSTANCE: the invention is pertaining to the method of protection and recovery of the corroded metallic surfaces working in conditions of the abrasive wear, action of the aggressive mediums, for example, at transportation of the fertilizers, in the heat and power industry, chemical industry and the extractive industry at the repairs of the rust through equipment. The method provides, that at first they apply on the metallic surface of the priming coating based on the composition containing the following components (in mass. %): 20.0-30.0 - the epoxy dian resin with the epoxy reacting weight of 450-500, the curing agent, 12.0-25.0 - pigments, 12.0-25.0 - fillers, 20.0-30.0 - polyamide curing agent Versamid 115, the rest - organic solvents, with the subsequent drying "up to detachment". After that they apply the second insulating layer having the following composition (in mass %): 20.0-35.0 - of the epoxy dian resin with the epoxy reacting weight of 450-500, 5.0-10.0 - pigments, 5.0-12.0 -fillers, 20.0-35.0 - polyamide curing agents Versamid 115, 10.0-30.0 - micaceous iron oxides, the rest - the organic dissolvents, with the subsequent "up to detachment". After that they apply the third outer layer from the composition containing the following components (in mass %): 20.0-40.0 - the acrylic or polyester hydroxyl-containing resin used as the binder, 10.0-20.0 - pigments, 5.0-10.0 - fillers, 11.0-22.0 - the curing agent - aliphatic polyisocyanate, 0.1-0.5 - the organically modified polysiloxane, the rest - the organic solvents, further the product is dried up to the complete solidification. The invention allows to increase the corrosion resistance of the coating.

EFFECT: the invention ensures the increased corrosion resistance of the coating.

1 tbl, 2 ex

 

The invention relates to the field of coatings on metal surfaces, steel, iron, aluminum, working in conditions of abrasive wear, corrosive environments in the energy, chemical and mining industries.

There is a method to protect and restore the 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 it dries "up 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, additional cover 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 (U.S. Pat. EN 2147027, publ. 27.03.2000, CO9D 5/08).

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

Closest to the present invention is a method for the protection and restoration of corroded metallic surfaces, comprising applying a primer layer on the base composition containing, wt.%:

epoxy Dianova the epoxy resin with the th equivalent weight of 450-500 20,0-30,0
pigments12,0-25,0
fillers12,0-25,0
hardener based on 3-n pentadecanolide6,0-12,0
organic solventsrest

with subsequent drying "up tack-free surface, applying an insulating layer of a composition containing, wt.%

epoxy Dianova resin with an epoxy equivalent weight of 450-50020,0-35,0
pigments5,0-10,0
fillers5,0-10,0
hardener based on 3-n pentadecanolide6,0-12,0
iron oxide10,0-30,0
organic solventsrest

with subsequent drying "up tack-free", causing the outer layer of the following composition (wt.%):

epoxy Dianova resin with an epoxy equivalent weight of 450-50020,0-30,0
pigments10,0-15,0
fillers15,0-25,0
hardener based on 3-n pentadecanolide6,0-12,0
organically modified polysilk is EN 0,2-0,6
organic solventsrest
(U.S. Pat. Of the Russian Federation No. 2220995, BI # 1 of 10.01.2004 g)

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

The technical result of the invention is to improve the protective properties of the coating.

This technical result is achieved in that in the method of protection and restoration of corroded metallic surfaces by applying a primer and insulating layers on the basis of epoxy Dianova resin, on the fat surface applied consistently primer of the following composition, wt.%:

epoxy Dianova resin with epoxy

equivalent weight of 450-500
20,0-30,0

pigments12,0-25,0
fillers12,0-25,0
the polyamide hardener Versamid 11520,0-30,0
organic solventsrest

and after drying it "until tack-free", that is, to the degree 1 according to GOST 19007-73, put insulating layer of the following composition, wt.%:

EPO is sydnaya Dianova resin with an epoxy equivalent weight of 450-500 20,0-35,0
pigments5,0-10,0
fillers5,0-12,0
the polyamide hardener Versamid 1156,0-12,0
iron oxide10,0-30,0
organic solventsrest

and then surface dried "up tack-free", will also cover the outer layer of the following composition, wt.%:

acrylic or hydroxyl-containing polyester resin20,0-40,0
hardener aliphatic polyisocyanate11,0-22,0
pigments10,0-20,0
fillers5,0-10,0
organically modified polysiloxane0,1-0,5
organic solventrest

then the dried coating to fully cure.

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 and other

As pigments used chromium oxide, Crohn's zinc, strontium and lead, blue phtalocyanines, red iron oxide, titanium dioxide, carbon technical the other

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

As a polyamide hardener used polyamide hardener company Henkel (Germany) trademark Versamid 115.

As the iron sludge use any iron oxide, for example:

a) brand Miox firm Kärntner Montanindustrie (Austria)containing Fe2O3- 85-94%, Al2About3- 2-3%, MgO - 1-2%, Sa - 0,3-1%, SiO2- 3-6%, Pb<0,1%;

b) brand Nubifer F. "Nubiola" (Spain)containing Fe2Oz - 89-94%; SiO2- 4,2%; Al2About3to 1.9%; Cao - 0,4%; MgO - 0,1%;2On - 0,2%;

C) iron oxide Altai field with the contents of the oxides of silicon, aluminum, magnesium and calcium, respectively, not more than 2.5, 1.8V, 0,2, 0.3% and a content of iron oxide Fe2O3- 90-95%.

As organically modified polysiloxane use modified polyester polydimethylsiloxane stamps BIC-307 firms BIK-Chemie (Germany) - modified polyester polysiloxane brand Baysilone OL 17 Bayer (Germany).

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

As acrylic or hydroxyl-containing polyester resin is used, for example:

(a) hydroxyl-containing acrylic resin Macrynal SM 636/70 YOU firm "Cytec Surface Specialties (Belgium), a polyacrylate, is holding a hydroxyl group;

b) hydroxyl-containing acrylic resin Desmophen A 665 VA Bayer (Germany);

C) hydroxyl-containing polyester resin Desmophen 670 VA Bayer (Germany).

As the aliphatic polyisocyanate hardener used aliphatic polyisocyanate hardeners based on the monomer of hexamethylenediisocyanate, for example, brands:

a) Desmodur N75 MPA/X Bayer, Germany;

b) Tolonate HDB75 IN firm Rhodia, France;

in) Uronal NL firm "Galstaff", Italy.

Protecting and recovering the metal surfaces of the equipment 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 excellent sliding abrasive materials.

Method of protecting metal surfaces as follows:

Example No. 1: steel surface

Originally applied primer composition, wt.%:

epoxy Dianova resin ED-8 Epoque is idnum equivalent weight of 450 30,0
pigments:

titanium dioxide,
6,0
strontium chronologicly6,0
fillers:

the micro-talc,
6,0
mikrobasic6,0
polyamide hardener brand Versamid 11530,0
organic solvents:

xylene,
4,0
the ethyl cellosolve8,0
acetonerest

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 airless spray, or brush. The primer layer is dried "up tack-free", then put the insulation layer of the following composition, wt.%:

epoxy Dianova resin e-41 with an epoxy equivalent weight of 500 30,0
pigments:

titanium dioxide,
4,8
carbon technical0,2
fillers:

the micro-talc,
7,0
mica5,0
polyamide hardener brand Versamid 11530,0
iron oxide Altai field10,0
the ethyl cellosolve5,0
xylene5,0
acetonerest

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 for 40 minutes. Add the hardener. The composition is uniformly applied on the primer layer and dried "up tack-free", then put the third layer composition, wt.%:

hydroxyl-containing polyester resin trademark Desmophen 670BA30,0
pigments:

titanium dioxide,
13,0
CZK pig the new lemon, 1,85
blue phtalocyanines0,15
fillers:

talc,
5,0
the micro-talc5,0
organically modified polysiloxane brand BIC-3070,3
aliphatic polyisocyanate hardener brand Tolonate HDB-75B16,5
xyleneto 12.0
butyl acetate6,0
the ethyl acetaterest

The outer layer is prepared by mixing parts of a polyester or hydroxyl-containing acrylic resins, pigments, fillers, organic solvents in disolver and dispersion in a bead mill, and then in the mixer and the resulting paste is mixed with the remaining amount of resin, solvent and organically 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 20° - 24 hours.

The protective coating used for painting of bridges and steel structures.

Example # 2: on cast iron surfaces apply a primer composition, wt.%:

epoxy Dianova resin er-4P with an epoxy equivalent weight of 500 20,0
pigments:

the zinc phosphate,
14,5
titanium dioxide,10,0
carbon technical0,5
fillers: micro-talcto 12.0
polyamide hardener brand Versamid 11520,0
organic solvents:

the ethyl cellosolve,
10,0
xylene,10,0
acetonerest

Then put the insulating layer composition, wt.%:

epoxy Dianova smiled-8 epoxy equivalent weight 500
20,0
pigments:

red iron oxide,
7,8
titanium dioxide,2,0
carbon technical0,2
fillers: talc,2,0
the micro-talc3,0
polyamide hardener brand Versamid 11520,0
iron oxide brand Miox30,0
organic solvents: xylene,5,0
the ethyl cellosolve,5,0
acetonerest

Then apply the outer layer composition, wt.%:

hydroxyl-containing acrylic resin brand Macrynal
SM636/70 YOU25,0
pigments:

yellow iron oxide pigment,
4,0
carbon technical0,4
titanium dioxide5,6
fillers:

talc,
5,0
the micro-talc5,0
aliphatic polyisocyanate curing agent mark
Desmodur N75 MPA/X13,0
organically modified polysiloxane brand
Baysilone OL 170,5
organic solvents:

xylene,
8,0
butyl acetate,8,0
the ethyl acetaterest

The drying time of the combined three-layer coating to grade 3 at 20° - 24 hours.

Table 1 shows the properties of three-layer coatings.

Table 1
The test results of the coatings
Feature coverageProtot the p-coating, applied according to the method according to U.S. Pat. 2220995The coating on the proposed method
Evaluation of the protective properties of three-layer coverage when tested in corrosive environments according to GOST 9.403
3%solution of KCl, days360400400
distilled water, days480540540
gasoline, days560600600
mineral oil, days560600600

The way to protect and restore corroded metallic surfaces, comprising applying a primer layer on the base composition containing epoxy Dianova resin with an epoxy equivalent weight of 450-500, hardener, pigments, fillers, organic solvents, followed by drying "up tack-free surface, applying an insulating layer of a composition containing epoxy Dianova resin with an epoxy equivalent weight of 450-500, hardener, pigments, fillers, iron oxide, organic solvents, followed by drying "up tack-free", causing the outer layer of the composition containing a binder, a hardener, pigments, fillers, op is anceschi modified polysiloxane, organic solvents, followed by drying to complete curing, characterized in that as the curing agent in the primer and the insulating layers injected polyamide hardener brand Versamid 115, and as a binder in the outer layer is injected acrylic or hydroxyl-containing polyester resin as a curing agent in the outer layer is injected aliphatic polyisocyanate, in the following ratio of components in layers:

in the composition of the primer, wt.%:
epoxy Dianova resin with an epoxy equivalent
weighing 450-50020,0-30,0
pigments12,0-25,0
fillers12,0-25,0
the polyamide hardener Versamid 11520,0-30,0
organic solventsrest
in the composition of the insulating layer, wt.%:
epoxy Dianova resin with an epoxy equivalent
weighing 450-50020,0-35,0
pigments5,0-10,0
fillers5,0-12,0
the polyamide hardener Versamid 11520,0-35,0
iron oxide10,0-30,0
organic solventsrest
in the composition of the outer layer, wt.%:
acrylic or hydroxyl-containing polyester resin20,0-40,0
pigments10,0-20,0
fillers5,0-10,0
hardener aliphatic polyisocyanate11,0-22,0
organically modified polysiloxane0,1-0,5
organic solventsrest



 

Same patents:

FIELD: paint and varnish industry, anti-corrosive agents.

SUBSTANCE: invention relates to corrosion modifying agents used for covering metallic surfaces without their preliminary cleansing from corrosion products. The corrosion modifying agent comprises the following components, wt.-%: hydrolysis lignin, 19-23; oil as by-side product in caprolactam manufacturing, 5-10; thermic ortho-phosphoric acid in the concentration 70%, 17-26, and water, balance. Invention provides preparing a composition transforming rust corrosion with layer thickness up to 160 mcm that provides enhancing adhesion of applied paint and varnish materials after treatment with the proposed modifying agent significantly.

EFFECT: improved and valuable properties of agent.

3 tbl

Rust transformer // 2286999

FIELD: paint and varnish industry.

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EFFECT: improved and valuable properties of transformer.

FIELD: building materials.

SUBSTANCE: invention relates to a method for preparing an aqueous epoxide corrosion-stable priming used for protection against corrosion and no containing hexavalent chrome compounds. Priming comprises aqueous epoxide compound based on bisphenol A diglycidyl ester, hardening agent and chromate-free pigment inhibiting corrosion. Hardening agent is taken among the group comprising aqueous modified adducts of amines or polyamidoamines decreasing the water content. Chromate-free pigment inhibiting corrosion comprises chromate-free pigment additive inhibiting corrosion that is taken among the group comprising mixtures of cerium molybdate with bismuth vanadate, cerium molybdate with strontium tungstate, cerium phosphate with strontium tungstate, bismuth vanadate with bismuth molybdate and strontium tungstate, and their mixtures also. Pigment-filling agents and hydrophobic hardening agent are added to the priming composite for enhancing waterproofness and corrosion resistance. Invention provides excluding the negative effect of hexavalent chrome on environment objects and human body.

EFFECT: improved and valuable properties of priming.

4 ex

FIELD: protective materials.

SUBSTANCE: invention relates to a method for preparing priming coat for steel that is designated for assembly and applying upper coat. Steel in grounded with priming coat comprising a silicon dioxide-base binding substance containing silicon dioxide aqueous sol stabilized with aluminum oxide and, optionally, small amount of alkaline metal silicate. Indicated binding agent shows the mole ratio SiO2/M2O = at least 6:1 wherein M means the total amount of alkaline metal ions and ammonium ions. After drying the priming coat up to disappearance of stickiness in weal touch by a finger it is treated optionally with a solution that enhances the strength of the priming coat film.

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12 cl, 7 tbl, 21 ex

FIELD: paint and varnish industry.

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EFFECT: improved and valuable properties of coating.

1 tbl

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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 invention relates to compositions of corrosion-resistant coatings cold drying and can be used to protect the corroded surface

Primer // 2196792
The invention relates to anti-corrosion coatings applied under acrylic, urethane, perchlorovinyl and epoxy enamel in the manufacture and repair of aircraft products from aluminium and magnesium alloys and steels

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EFFECT: the invention ensures the simultaneous heat insulation and protection of the surfaces against corrosion, the possibility to exercise protection of the substances and the products operating under conditions of the heightened humidity, action of the heightened temperatures and the temperatures difference, that is specially important at protection of the metallic pipelines of the hot-water supply, the natural gas and petroleum pipelines.

3 tbl

FIELD: protective compositions and materials.

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EFFECT: improved and valuable technical properties of composition.

3 cl, 3 tbl

FIELD: thermo-setting heat-activated paint compositions, application of such composition on substrate.

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EFFECT: enhanced efficiency.

15 cl, 3 tbl, 9 ex

FIELD: polymer materials as protective coatings.

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EFFECT: improved performance characteristics of coatings.

2 cl, 1 tbl, 6 ex

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EFFECT: increased oil resistance in media of water-saturated petroleum products.

2 tbl

FIELD: polymer materials and corrosion protection.

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EFFECT: reduced inflammability and increased resistance to wet loose mineral fertilizers.

2 tbl

FIELD: special compositions and covers.

SUBSTANCE: invention relates to applying anti-corrosive and anti-friction covers. Invention describes a composition used in preparing covers by autophoresis method and this composition comprises the following components: polytetrafluoroethylene F-4D 57% aqueous suspension, copolymer of tetrafluoroethylene with hexafluoropropylene F-4MD 53% aqueous suspension, oxyethylated alkylphenol, filling agents - titanium dioxide, ground mica, technical carbon of sort K-354, aerosil of sort AA taken in the ratio = 2:1:1:0.3, respectively, solvents - 1,4-butanediol, butyl cellosolve and xylene taken in the ratio = 1:0.7:0.7, respectively, polyvinylpyrrolidone, polymethylphenylsiloxane 30% solution in toluene, ortho-phosphoric acid, amino-derivatives of benzimidazoles: 2-(1-methyl-2-pyrrolyl)-5-aminobenzimidazole, 1,2-dimethyl-5,6-diaminobenzimidazole dihydrochloride, 2-(n-methoxyphenyl)-5-aminobenzimidazole and water taken in the claimed ratio of components. Invention provides absence of pores in cover, enhancing wear resistance and corrosion-protective properties of cover.

EFFECT: improved and valuable technical properties of composition and covers.

2 tbl, 4 ex

FIELD: corrosion protection.

SUBSTANCE: invention provides homogenous corrosion-inhibiting composition, which contains 20-30% water-soluble phosphate, 5-20% starch, and balancing amount of zeolite and/or schungite, said water-soluble phosphate being selected from alkali or alkali-earth metal phosphates, orthophosphates, and dihydrogenorthophosphates, in particular dipotassium phosphate. Composition may further contain sodium or potassium silicofluoride. Composition is of especial importance for use as corrosion inhibitor for solid antiicing agents based on inexpensive and accessible chlorides, particularly magnesium chloride.

EFFECT: increased efficiency and stability of protective properties and duration of effect, especially on building and road-building materials.

1 tbl

FIELD: chemistry of polymers, chemical technology.

SUBSTANCE: invention relates to a polymeric composition designated for anti-corrosive protection of petroleum-gas-pipelines, metal constructions, equipment used in different techniques and as impregnating compositions, hermetic agents and others. The composition comprises the following content mas. p. p.: epoxy diane resin, 100; epoxy aliphatic resin. 24-60; oligoether cyclocarbonates with the mass part of cyclocarbonate groups from 18 to 29, 1-30; froth breaker, 0.5-2.5; coal resin, 0.75-2.0; ether epoxide "Penta-539", 0.5-8; filling agent, 1.5-8.5, and amine hardening agent, 40-85. As an epoxy aliphatic resin the invention uses oligoether epoxides with the content of epoxy group from 7.5% to 28%. As froth breaker the invention uses silicone froth breaker or siloxane resin, or an acrylic froth breaker. Ether epoxide "Penta-539" represents product of esterification of epoxy resin and saturated carboxylic acid. As amine hardening agent the invention uses a mixture of product (A) that is prepared by interaction of aromatic amine (B) with salicylic acid (C) and a plasticizing agent (D) representing an oxygen-containing compound from polyol group and taken in the ratio B:C:D = (73:2:25)-(42:8:50), respectively, and an organosilicon amine (E) in the ratio A:E = (99:1)-(1:99). The invention provides enhancing the rupture strength value, relative rupture elongation value, adhesion to steel, water resistance, to reduce water absorption being both in the parent and after prolonged effect of water state, and to reduce the viscosity value without using solvents also.

EFFECT: improved, enhanced and valuable properties of composition.

2 tbl, 9 ex

FIELD: building industry and materials.

SUBSTANCE: invention proposes a polymeric composition comprising the following components, mas. p. p.: polysulfide oligomer, 100; unsaturated polyester resin PN-1, 90-100; aerosil, 5-20; organic peroxide, 3-20; cobalt naphthenate 10% solution in styrene, 2-4, and 2,4,6-tris-(dimethylaminomethyl)-phenol, 0.5-1. The composition provides preparing covers with enhanced strength properties, adhesion to substrates and showing hydroinsulating properties, resistance against effect of acid and alkali solutions and improved technological procedure for their applying. Invention can be used in preparing hydroinsulting, sealing and anti-corrosive compositions processed by pouring and spraying method.

EFFECT: improved and valuable properties of composition.

2 tbl

FIELD: powder materials for making coats of items during protracted operation at high working temperatures.

SUBSTANCE: proposed powder material contains the following components: from 40 to 65 mass-% of at least one solid epoxy resin which is semi-functional relative to thermal cross-linking by epoxy groups at equivalent mass of epoxide from 380 to 420 g/eq and ICI viscosity of melt at 150C from 2800 to 5000 mPa·s and softening temperature from 95 to 105C (A); from 15 to 35 mass-% of at least one solid linear epoxy resin on base of bisphenol A , AD and/or F whose functionality relative to thermal cross-linking by epoxy groups is equal to 2 maximum; from 15 to 30 mass-% of inorganic filler (b) and from 1 to 10 mass-% of at least one hardener. Powder material is applied on metal bases and are thermally cross-linked or hardened.

EFFECT: enhanced parameters of elasticity, wear resistance, resistance to scratching; enhanced water prooofness and corrosion resistance of coat.

12 cl,, 2 tbl, 4 ex

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