Multi-layer anticorrosive coat with carbon nano-tubes

FIELD: application of multi-layer priming coats for corrosion protection of metalwork subjected to action of aggressive media.

SUBSTANCE: proposed multi-layer coat at total thickness of 220-240 mcm consists of priming layer, 80-100 mcm thick, intermediate layer, 70-90 mcm thick and covering layer. Priming, intermediate and covering layers are formed from paint-and-varnish material on base of film-forming agent; this material contains 10-48 vol-% of carbon nano-tubes and 40-86 vol-% of highly-dispersed zinc filler.

EFFECT: enhanced resistance to action of aggressive media; increased service life of articles.

2 dwg, 8 ex

 

The invention relates to coatings for corrosion protection of metal structures and can be used for all metal structures exposed to aggressive environments.

Known aqueous composition for coating containing 5 to 95 wt.%, at least one nabukelevu in the alkali type polymer core-shell and 95-5 wt.%, at least one of polyurethane, and the sum of the wt.%, specified for polymers, always amounts to 100 wt.%, where Nauheim in alkali-type polymer core-shell copolymer is obtained in two or more stages of emulsion polymerization and obtained by copolymerization in the first stage (see RF patent №2254351, IPC 09D 175/04).

The lack of water composition is the occurrence of corrosion of metal structures under the coating layer, resulting from the use of water composition and alkali.

Also known aqueous epoxy corrosion resistant primer containing aqueous epoxy compound, curing agent and bichromatic inhibiting corrosion of the pigment (see patent RU No. 2003134603, IPC 09D 151/00, G09D 5/02).

The disadvantage of this technical solution is the occurrence of corrosion of metal structures under the coating layer, resulting from the use of water epoxy compound and its propensity to raster is skimania the temperature drops.

Known multi-layer anticorrosion metallic coating consisting of a primer comprising at least two layers formed from a material containing fine powder of zinc in the environment orhangazispor thermoplastic binder, and then applying at least one coating layer (see RF patent №2155784, IPC SS 28/00).

Closest to the proposed technical solution is based coating for corrosion protection of metal containing film-forming substance, superfine zinc powder and carbon nanotubes (see JP patent 2005068278 And 17.03.2005).

A disadvantage of the known paint material is a low resistance to aggressive environment and service life corrosion protection does not exceed 5-7 years.

The present invention is to improve the effectiveness of the corrosion protection of steel structures and ensuring a longer service life corrosion-resistant coating, by increasing the durability of the paint coating, due to the introduction of nanotubes. The application of carbon nanotubes, due to their high conductivity, equalizes the electrical potential of the coating, resulting in a composite material, which reduces if estvo superfine zinc powder. (Under normal use superfine zinc powder quantity is 90-93% by volume, since otherwise there will be no direct contact between the particles of zinc and, as a consequence, the cathodic protection. In addition, such protection is unstable, physico-chemical properties and temporal characteristics.) Thus the conductivity between the particles highly dispersed zinc powder is provided for the introduction of carbon nanotubes, which not only increases the effectiveness of the cathodic protection, but also reduces the amount of superfine zinc powder to 40% by volume. In known systems coating carbon nanotubes are used only to increase the resistance of the coating to abrasion (destruction). In addition, when the number 10-48% by volume is sufficient structural strength due to the presence in the composite superfine zinc powder.

This object is achieved in that according to the invention coating for corrosion protection of metal containing film-forming substance and superfine zinc powder and carbon nanotubes, made in the form of multi-layered corrosion-resistant coating consisting of a primer layer thickness of 80-100 μm, an intermediate layer of a thickness of 70-90 μm and the coating layer is, formed from the paint material based on film-forming and containing from 10 to 48% of the volume of carbon nanotubes, from 40 to 86% of fine zinc filler, and a total thickness of 220-240 microns.

Elektoprovodnosti carbon nanotubes is several times higher than the conductivity of copper, which not only provides a reliable electrical contact, but also draining static charges from the surface of the paint material, providing greater safety of the structure.

Carbon nanotubes as one-dimensional carbon material were opened about 10 years ago. A new molecular form of carbon discovered a whole series of new and unexpected physical, mechanical and chemical properties. These unique properties have made nanotubes key element of nanotechnology.

Nanotubes currently mainly used in the fabrication of molecular electronic devices, nanotransistors and memory elements. Due to the unique mechanical properties of nanotubes can also produce carbon composites extraordinary strength for the automotive and aerospace industries.

Carbon nanotubes have about 100 times more rigid than steel, with six times lower density, while the electric current.

Carbon is s frame structure these are large molecules composed entirely of carbon atoms. You can even say that the carbon frame is a new allotropic form of carbon (in addition to the long known: that of diamond and graphite). The main feature of these molecules is their frame shape: they look like closed, empty inside "shell", for example, the fullerene C60(figa), after it was developed a method of obtaining fullerenes in macroscopic quantities, found many other, both lighter and heavier fullerenes: from C20 (minimum of fullerenes) and to p70C82With96and above (some of them shown in figure 1).

Figure 1. Some members of the fullerenes: a) C60, C60, C) S.

Have also been found long, cylindrical carbon formation, called nanotubes (figure 2).

Figure 2. Examples of nanotubes.

Nanotubes could be large and small, single and multi-layer, direct (figa, b), and spiral (pigv) (see Pan et al. "Very long carbon nanotubes". Nature 394 (1998) 631). Despite the apparent fragility, and even delicacy, nanotubes proved to be extremely durable material, such as tensile and Flexural strength.

As the results of experiments and numerical modeling young's modulus of single-walled nanotubes reaches values of the order of 1-5 TPA, that an order of magnitude greater than that of steel. Currently, the maximum length of the nanotubes ranges from tens to hundreds of microns and a diameter of from 20 to 50 nm. To solve this problem you can use and longer nanotubes, and the diameter doesn't matter, although nanotubes with the same diameter to provide a more stable physical and chemical properties.

Dispersion of zinc filler is from 20 to 100 nm.

As film-forming substances can be used any materials used to protect metal structures from corrosion by a method of staining (see, for example, STF 001-95, Protection of metal constructions of bridges from corrosion by a method of dyeing Corporation "Transstroy", Moscow, 1995), with additional introduction of carbon nanotubes and zinc filler does not affect processes in the coating and the durability of any paint coating will increase. In addition, this will occur for any coating including a single layer. However, the single-layer coating, are at present of no use and are only used for temporary protection during transportation of the unit to the place of installation.

In the preparation paintwork originally manufactured by mixing zinc filler and nanotubes. After this mixture is zinc filler and nanotubes is added to the formers, mixed and applied to protect the surface must be cleaned of rust and fat. Further layers are applied after hardening of the previous layer. Before applying the first (primer) layer, cleaned the metal from rust (if it is present) and degreasing. These operations should be performed in accordance with the STF 001-95, Protection of metal constructions of bridges from corrosion by a method of dyeing Corporation "Transstroy", Moscow, 1995) or other normative documents.

The most suitable in moderate conditions to use in the surface layer of carbon nanotubes without filling zinc as sacrificial protection will occur only after the destruction of the surface layer.

New in the proposed solution is the use of new materials and technologies, which recently started to be applied in the microelectronics industry to create a more cheap and fast processors. The use of nanotubes in the paint industry allows not only to reduce the cost of production antikorrozionnym materials, but also to increase the duration of maintenance-free operation up to 25-28 years.

The advantages of the new paint coating for protection of metal constructions are illustrated by the table presented is managing the different systems of coatings to protect metal structures from corrosion for different operating conditions.

The advantages of the new paint coating for protection of metal constructions are illustrated by table representing different systems coatings to protect metal structures from corrosion, in which the film-forming substance is polyurethane (TU 84-404-78) with different amounts of carbon nanotubes and zinc filler for various operating conditions.

Table
Primer paint layerIntermediate paint layerTop coat Quantity: nanotubes / Zn %The approximate thickness of the entire coating, mcmLife coverage
Quantity: nanotubes / Zn %The approximate thickness of the layer. mcmQuantity: nanotubes / Zn %Estimated layer thickness, micronsN1F1
1. 20/6680-10010/7670-9040/46220-2402825
2. no/9080-100no/6070-90no/86140-160171
3. 90/no80-10050/no70-9048/no140-1501514
4. 60/no40-5040/no70-9090/no90-1201012
5. 20/6680-10010/76140no220-2401311
6. 20/6680-10010/7670-90no150-1901210
7. 20/66220-240nonono220-240108
8. 20/6680-100nonono80-10075
Note: N1 - temperate climate;
F1 - cold climate.

Multi-layer anti-corrosion coating for protection of steel structures, consisting of a primer layer thickness of 80-100 μm, an intermediate layer of a thickness of 70-90 microns and a coating layer formed of a paint and varnish material based on film-forming and containing from 10 to 48% vol. carbon nanotubes, from to 86% vol. highly dispersed zinc filler, and a total thickness of 220-240 microns.



 

Same patents:

FIELD: chemical industry; printing industry; powder metallurgy industry; cosmetic industry; other industries; production and application of the highly anticorrosive metallic pigments.

SUBSTANCE: the invention is pertaining to production of the of the highly anticorrosive metallic pigments similar to laminas, which may be used in production of the printing ink, plastic materials, cosmetics, the powder coatings and in other branches of industry. The pigments have on their surfaces: the metallic substrates similar to the laminas and treated with the compounds of the phosphoric acid and-or the compounds of the boric acid; one or more layers of the coatings consisting of one or more hydrated oxides of the metals of one or more metals selected from the group, which includes silicon, aluminum, zirconium, titanium and tin. On the basis of the highly corrosive metallic pigments similar to laminas it is possible to produce the interferential colored pigments. The invention allows to increase the anticorrosive resistance of the metallic pigments at the expense of saving without the faults of the initial surface smoothness of the similar to the laminas metallic substrates, to increase the homogeneity and density of the layers of the hydrated oxides of the metals.

EFFECT: the invention ensures the increased anticorrosive resistance of the metallic pigments, saving the initial surface smoothness of the similar to the laminas metallic substrates, the increased homogeneity and density of the layers of the hydrated metals oxides.

40 cl, 9 ex, 4 tbl, 8 dwg

FIELD: priming compositions for protection of metal surfaces working under atmospheric conditions against corrosion; application of primers and coats.

SUBSTANCE: proposed primer-enamel paint includes the following components, mass-%: 40.0-60.0 of epoxy diane resin,; 5.0-15.0 of 50-% polyvinyl acetate dispersion and 0.2-2.0 of synthetic oligopiperylene rubber used as film-forming agents, 0.03-0.1 of polyoxyethylene alkyl phenol ester used as surfactant; 2.0-5.0 of chromium (III) oxide, as well as 2.0-5.0 of aluminum hydroxide and 2.0-5.0 of cardinal red used as anti-corrosion pigments, 8.0-12.0 of polyethylene polyamine used as hardening agent, 0.3-0.7 of dibutyl phthalate used as plasticizing agent, 1.0-10.0 of butyl cellosolve used as cosolvent, 0.01-1.0 of orhto-phosphoric acid used as modifying additive, water, up to 100.

EFFECT: improved quality of coat; enhanced resistance to oils, gasoline, lubricating and cooling fluids and aggressive media.

2 tbl, 16 ex

FIELD: protective materials.

SUBSTANCE: invention relates to compositions used for applying covers. Composition contains zinc and water glass - potassium water glass as a binding agent with silicate modulus 4.8-5.3 or mixture of sodium-lithium water glass with silicate modulus 3.8-4.2 comprising the following components: soluble sodium silicate, technical lithium hydroxide, fumed silica, drinking water and ferrophosphorus. Invention can be used for protection of ferrous metals against corrosion with zinc-filled compositions. Invention provides improving anticorrosive and antifriction properties, enhancing wear resistance, electric conductivity, durability against cracking in drying, enhanced adhesion to metal, welding capacity, strength at impact.

EFFECT: improved and valuable technical properties of composition.

1 tbl

FIELD: protective coatings.

SUBSTANCE: invention relates to undercoat for metallic substrates designed for manufacturing articles and for applying top coating layers. Undercoat comprises silicate binder containing aqueous silica sol having SiO2/M2O molar ratio at least 25:1, wherein M represents sum of alkali metal ions and ammonium ion, silica particles having average size above 10 nm. Binder may further contain insignificant amount of alkali metal silicate. Content of solids in undercoat ranges between 20 and 40% (v/v) and volume ratio of pigment concentration to critic concentration thereof is below 1. Undercoat contains following proportions of components aqueous silicate sol as binder having SiO2/M2O molar ratio at least 25:1 and pH value between 9.5 and 11, wherein M represents sum of alkali metal ions and ammonium ion and silica particles are optionally modified with aluminum oxide and have average diameter 10-16 nm; 10-55% zinc and/or zinc alloy powder based on the weight of dry film having average particle size between 2 and 12 μm; 0-35% organic resin based on the weight of dry binder; and 0-30% organosilicon finishing material. Coating may contain zinc-free pigment(s) and filler increasing storage life time of undercoat. Method of applying undercoat onto steel substrate comprises preparing undercoat using silica sol, whose pH is adjusted to 9.5-11, and depositing undercoat onto steel substrate.

EFFECT: increased hardness and wear resistance, and enabled deposition of corrosion-resistant coating without blistering.

15 cl, 10 tbl, 14 ex

FIELD: corrosion protection.

SUBSTANCE: invention relates to anticorrosion compositions for metallic parts, in particular to utilization of MoO3 as agent enhancing anticorrosive properties of composition for anticorrosion coating based on dispersed metal, containing zinc of zinc alloy in aqueous phase (30-60% water in dispersion) and containing binding agent. Compositions for anticorrosion coating of metallic parts are disclosed containing such corrosion inhibitor (MoO3); at least one dispersed metal selected from group composed of zinc, aluminum, chromium, manganese, nickel, titanium, and alloys thereof; organic solvent; thickening agent; silane-based binder; optionally sodium, potassium, or lithium silicate; and water in amount from 30 to 60% by weight. Disclosed are also anticorrosion coating and metallic substrate with deposited anticorrosion coating prepared from above-defined composition.

EFFECT: improved resistance of composition to salt fog action.

22 cl, 2 dwg, 6 tbl, 3 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.

EFFECT: improved and valuable properties of coat.

12 cl, 7 tbl, 21 ex

FIELD: corrosion protection.

SUBSTANCE: protective ground paint for painting coiled metal and electrochemical protection of bridges, power lines, and other long term-use metallic structures contains, wt %: epoxide resin 9.0-29.0, polyamide resin 3.0-9.5, pigment 23.0-36.0, zinc nanoparticle preparation 3.0-5.0, filler 13.0-23.2, and solvent - the balance. Zinc nanoparticle preparation is introduced in the form of (0.4-4)x·10-3 M solution in isooctane.

EFFECT: enhanced protective properties.

2 tbl, 4 ex

Coating composition // 2245893

FIELD: chemistry, in particular coating compositions, dyes and colorings.

SUBSTANCE: claimed composition includes resin with curing agent in combination with metal powder and stabilizing additive. More particular composition contains polyester resin or epoxy resin, 40-80 mass % of aluminum, iron, bronze, brass or copper powder with particle size of 25-250 mum, and as stabilizing additives at most 5 mass % of feltproofing additive and at most 20 mass % of thixotropic additive. Composition has high storage stability and useful for coating of any geometry surface.

EFFECT: coatings of high heat conductivity and thickness applicable for mechanical operation.

1 tbl

The invention relates to paints, varnishes and lacquers, namely priming water-dispersed compositions intended for the protection against corrosion of metal surfaces, operated in atmospheric conditions and exposed to various liquids

The invention relates to a protective coating of metal and concrete surfaces used in high corrosive activity

FIELD: single-layer and multi-layer priming coats for corrosion protection of metalwork subjected to action of aggressive media.

SUBSTANCE: proposed single-layer coat is made from paint-and-varnish material on base of film-forming agent containing carbon nano-tubes filled with zinc. Multi-layer coat, 90-240 mcm thick, includes priming layer , 40-100 mcm thick and covering layer. Priming and intermediate layers are made from paint-and-varnish material on base of film-forming agent containing 40-86% of carbon nano-tubes filled with zinc. Covering layer is made from paint-and-varnish material containing the carbon nano-tubes which are not filled with zinc.

EFFECT: enhanced resistance to aggressive medium; increased service life of coat.

3 cl, 2 dwg, 8 ex

FIELD: chemistry of polymers.

SUBSTANCE: invention proposes polyurethane solvent-free reactive bicomponent system used in preparing covers showing thermal stability at temperature until 90oC, elasticity and compatible with cathode protection. The system consists of, for example, chlorinated paraffin hydrocarbon or polychlorodibutoxybenzene as chlorinated soft resin and containing OH-groups of component, in particular, containing simple ether groups with functionality ≥3.5 and molecular mass 280-1000 Da, or their mixtures consisting of such components and polyisocyanate component.

EFFECT: valuable technical properties of system.

14 cl, 7 tbl

FIELD: protecting covers.

SUBSTANCE: invention relates to dye-cover. Proposed dye-cover is prepared from composition comprising components taken in the following ratio, wt.-%: binding agent, 20-30; hollow microspheres, 10-30, and organic solvent, the balance. A binding agent is chosen from group comprising organosilicon resin, acrylic (co)polymer, polyurethane. Ceramic or glass hollow microspheres of size 20-150 mc are uses as hollow microspheres. The composition can comprise additionally titanium dioxide in the amount 2-5 wt.-% and antipyrene additive in the amount 5-25 wt.-%. Invention provides refractoriness, atmosphere resistance and exploitation period. The proposed dye-cover possesses heat-insulting, sound-insulating, waterproofing properties simultaneously and designated for protecting different equipment, pipelines, metallic, concrete, ferroconcrete, brick, wood and other building constructions for habitable, common knowledge and industrial buildings and constructions.

EFFECT: improved and valuable technical properties of dye-cover.

2 tbl, 9 ex

FIELD: wear-resistant protective polymer coats applied for protection against corrosion and mechanical wear; oil-and-gas industry; food-processing, pharmaceutical and other industries.

SUBSTANCE: proposed compound contains the following components, mass-%: 14-20 of epoxy diane resin used as binder; 24-28 of aminophenol hardener; 80-86 of resin - oxyline-5 or oxyline-6 used as modifying agent; 5-10 of aerosil used as fine-grained filler; 50-60 of mixture of graphite and molybdenum disulfide used as anticorrosive filler at mass ratio of graphite to molybdenum disulfide equal to 4:1 and solvent for obtaining the working viscosity. Proposed compound makes it possible to obtain tensile strength of 10.5-19.2 Mpa, relative elongation at rupture of 30.8-40.2 and friction coefficient in metal (Ct3) of 0.048-0.074 at 30C and 0.028-0.042 at 70C.

EFFECT: enhanced water and gasoline resistance.

3 cl, 2 tbl, 5 ex

FIELD: oil producing industry; natural gas industry; production of the anticorrosive primer coating.

SUBSTANCE: the invention represents the anticorrosive primer coating intended for the anticorrosive protection of the steel pipelines predominantly of the oil pipelines and the natural gas pipelines at their building and overhaul and may be used for zone insulation of the welded couplings of the pipes together with the thermal shrink couplings and also for reconditioning of the insulation defects. For increasing the adhesion strength to the polyethylene and the steel as well as the primer coating protection stability against the cathodic spalling at the heightened temperature and slowing down of the underfilm corrosion by the primer coating it contains the butadien-styrene rubber, n-tret- butylphenolformaldehyde pitch, the copolymer of ethylene with the vinylacetate of "Evalan" brand, the mixture of the aminemethyl derivatives of nonylphenols and their hydrochlorides in the ratio from 25:1 up to 1:1, pyrocatechol, magnesium oxide, industrial carbon and the petroleum solvent.

EFFECT: the invention ensures, that the anticorrosive primer coating provides the anticorrosive protection for the oil and natural gas steel pipelines at their building and overhaul, for the pipelines welded couplings areas insulation as well as reconditioning of the insulation defects.

2 tbl

FIELD: polymer materials.

SUBSTANCE: invention provides composition for producing polymeric protective coatings on various surfaces, including metal, concrete surfaces, structural members of conduits, metal units and assemblies in different technical areas, said coatings serving as barriers against attacks of various-type corrosive media. Composition contains following components, wt %: epoxide dian resin, 33.5-41.0; dibutyl phthalate and/or aliphatic epoxide resin DEG-1, 2.5-10.0; polyethylene-polyamine hardener, 4.0-6.5; plate filler in the form of andesite basalt scales with scale thickness 0.2 to 7.0 μm, 42.5-50.0, and, if necessary, Aerosil, 0-6.0, and/or organic solvent, 0-17.5.

EFFECT: reduced toxicity of composition, simplified preparation thereof, reduced barrier properties thereof, and extended functional destination.

2 tbl, 5 ex

FIELD: ferrous metallurgy; oil refining industry; building industry; chemical industry; compositions for production of the anticorrosive zinc-containing base coatings.

SUBSTANCE: the invention is pertaining to the compositions for production of the anticorrosive zinc-containing base coatings intended for a sacrificial protection from corrosion of the products, buildings and constructions made out of the ferrous metals exploited in the atmospheric conditions, in the conditions of water-saline mist, in the medium of the oil products vapors and aerosols. The composition for production of the antirust coating includes the fine-dispersive zinc powder, the three-metal desiccant, the toluene, the modified alkyd film-forming substance, in the capacity of which they use the short-alkyd varnish with addition of the tung oil, modified with the phenol-formaldehyde resin in amount of no more than 5.0 % of the mass of the alkyd film-former, with the acid number of no more than 15.0 mgKOH/g of the film-former and the dynamic viscosity after Brunkfild - 2.0-4.5 Pa·s, and the antisediment additive, in the capacity of which use the admixture of zinc oxide, lecithin and the organophilic bentonite of SD-1 brand. The composition has the high sediment stability at storing and at coating, dries faster and ensures production of the antirust coatings with the heightened resistivity to the water and petroleum action.

EFFECT: the invention ensures production of the composition having the high sediment stability at storing and coating, the fast drying and used for application of the antirust coatings with the heightened resistivity to the water and petroleum action.

2 tab

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

FIELD: petroleum industry; natural gas industry; chemical industry; other industries; production of the compositions used for application of the anticorrosive and heat-insulating coatings on the pipelines.

SUBSTANCE: the invention is pertaining to the field of production of the coatings possessing the anticorrosive and heat-insulating properties at their deposition on the pipeline. The invention is dealt with application of the water-suspension composition including as the binding the water-emulsion polymeric latex composition containing the latex on the basis of the copolymer selected from the group of the (homo) acrylate copolymer, styrene-acrylate copolymer, or styrene-butadiene copolymer, polybutadiene polymer, polyvinylchloride polymer, polyurethane polymer, the polymer or the copolymer on the basis of the vinyl acetate or their mixtures, in the combination with the surface-active substance and the water, and as the filler it contains the mixture of the hollow microspheres ( made out of glass, ceramic, ash, polymers) differed among themselves by the dimensions within the limits of 10-500 microns and the bulk specific gravity within the limits of 650-50 kg/m3 and taken in the certain ratios. As a result of application of this composition as the coating the invention ensures the simultaneous protection of the surfaces against corrosion and the heat insulation and offers the possibility to exercise protection of the substances and the products operating under conditions of the heightened humidity, under the conditions of action of the heightened temperatures, under the conditions of action of the temperatures difference, that is specially important at protection of the metallic pipelines, both the pipelines of the hot-water supply and the natural gas pipelines and petroleum pipelines.

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.

SUBSTANCE: invention relates to a method for preparing protective covers being especially such as metal and concrete. Composition comprises silicon emulsion or silicon dispersion as a binding agent, mixture of hollow microspheres distinguishing by size and bulk density values and chosen from group comprising hollow glass microspheres, hollow ceramic microspheres, polymeric hollow microspheres, technogenic hollow microspheres, surface-active substance, titanium dioxide or zinc dioxide and, if necessary, accessory special additives taken in the definite ratio of components. Using this composition the invention provides preparing covers on pipe lines by its applying firstly as a thin layer on cold surface, followed by heating to 200-250°C, repeated its applying on hot surface by thin layer, followed by applying of material on a cover as metallic wire or net, or winding ob pipe line with applied cover by at least band layer as separate bands made of steel (stainless) and wherein these bands (small bands) are covered preliminary with abovementioned composition by at least one side wherein this composition is filled with hollow microspheres and at least one of lateral band surfaces shows alternating `projections and grooves of right-angled form and similar linear sizes. Grooves have flanges equal with grooves square and excluding dense adjoining of bands to pipeline surface in their winding and creating air layer. Joining of separate bands is carried out during winding is carried out using projections and grooves by end puzzle type. Invention provides preparing covers showing good and sufficiently high protective properties: high heat-protecting properties under effect of high temperatures in the range 500-1000°C, good anticorrosive properties and good fireproofing properties that provides multifunctional properties of covers proposed. Invention can be used in protection of pipelines against effect of different negative factors in their exploitation, in part, in protection against corrosion, fire and as heat-protecting cover.

EFFECT: improved and valuable technical properties of composition.

3 cl, 3 tbl

FIELD: single-layer and multi-layer priming coats for corrosion protection of metalwork subjected to action of aggressive media.

SUBSTANCE: proposed single-layer coat is made from paint-and-varnish material on base of film-forming agent containing carbon nano-tubes filled with zinc. Multi-layer coat, 90-240 mcm thick, includes priming layer , 40-100 mcm thick and covering layer. Priming and intermediate layers are made from paint-and-varnish material on base of film-forming agent containing 40-86% of carbon nano-tubes filled with zinc. Covering layer is made from paint-and-varnish material containing the carbon nano-tubes which are not filled with zinc.

EFFECT: enhanced resistance to aggressive medium; increased service life of coat.

3 cl, 2 dwg, 8 ex

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