Anti-corrosive coat with carbon nano-tubes filled with zinc
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
The invention relates to coatings for corrosion protection of metal structures and can be used for all metal products 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, 09D 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 Rastrelli aniu 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).
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.
Closest to the proposed technical solution is based coating containing a film-forming substance 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 years.
The present invention is to improve the effectiveness of the corrosion protection of steel structures for long life with increased service life of corrosion-resistant coating of metal structures by creating on the surface of the coating uniform electric potential equal to the potential of the protected metal construction, and implementation on the additional cathodic protection.
This object is achieved in that in the corrosion-resistant primer coating for protection of steel structures made of paint material based on film-forming carbon nanotube, according to the invention the coating contains from 40 to 86% of the volume of carbon nanotubes filled with zinc.
Multi-layer anti-corrosion coating to protect the metal-containing primer layer, intermediate layer and surface layer, according to the invention contains a primer layer on the carbon nanotubes filled with zinc in an amount of from 40 to 86% of the volume and thickness of 40-100 μm, the intermediate layer is a primer layer containing carbon nanotubes filled with zinc in amounts of from 40 to 86% of the volume, and thickness of 70-90 microns, and a surface layer made of a paint and varnish material containing carbon nanotubes, not filled with zinc and a total thickness of multi-layer anti-corrosion coating 90-240V microns.
Introduction inside carbon nanotubes zinc allows to obtain zinc cylinders with a constant diameter. It is provided with calibrated holes inside carbon nanotubes. Introduction inside carbon nanotubes zinc also provides additional cathodic protection of steel structures with stable Phi is ICO-chemical properties, since the damage of a paint material reaching the surface of the metal, the formation of galvanic couples zinc - iron. While the iron begins to corrosivity only after all zinc is oxidized. The conductivity of the film-forming substances not only helps to protect the metal, but also provides drainage of static charges from the surface of the paint material, providing greater safety of the structure.
The number of carbon nanotubes, comprising from 40 to 86% of the volume of paint material, ensures high durability paint material, which is especially important for the formation of the surface layer. With these parameters the destruction process continues long enough - a few tens of years.
Stable physico-chemical properties of the coating are provided with a thin grooved channels in carbon nanotubes filled with zinc.
The length of the nanotubes ranges from tens to hundreds of microns and a diameter of from 20 to 50 nm. The amount of zinc in the nanotubes depends on their length and diameter as the internal volume of the nanotube is filled completely, and the filling of nanotubes based on the phenomenon of capillary retracting liquid substances, in this case the molten metal (see Avelizy Success Fizicheskaya, 2004, t, s). To obtain the same physico-chemical properties should only use nanotubes with a small variation in diameter.
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.
The carbon frame is a large molecule 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 holleran 60(figa), after it was developed a method of obtaining fullerenes in macroscopic quantities, found many other, both lighter and heavier fullerenes, starting from s20(minimum of fullerenes) and to p70C82With96and above (some of them shown in figure 1).
1 Some members of the family of fullerenes: a) C60b) C60c) C80
Have also been found long cylindrical carbon formation, called nanotubes (figure 2).
Figure 2 Examples of nanotubes
Nanotubes can 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 as tensile and Flexural strength.
As the results of experiments and numerical simulations, the young's modulus of single-walled nanotubes reaches values of the order of 1-5 TPA, which is 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 has no C is achene, although nanotubes with the same diameter to provide a more stable physical and chemical properties.
In recent years, dramatically increased the interest in and study of filled carbon nanotubes. One of the main directions of filling nanotubes with metals: Fe, Ni, Co, and so on, which allows you to create materials with unique magnetic properties (see Finger, 2003, 10, VIP).
For filling carbon nanotubes using different approaches, discussed in detail in the review (Avelizy success of the physical Sciences, 2004, t, s). For over ten years, used a method based on the phenomenon of capillary retracting liquid substances, in this case the molten metal.
In nanotubes can not only "push" the atoms and molecules individually, but literally "pour" substance. As the experiments showed, the open nanotube has capillary properties, that is, it draws the substance. Thus, the nanotubes can be used as microscopic containers.
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), while more is that introduction of carbon nanotubes, filled with zinc, 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, single-layer coatings are considered to date are not promising and are used only for temporary protection during transportation of the unit to the place of installation.
After that nanotubes are added to the binders, mixed and applied to the protected surface. Further layers are applied after hardening of the previous layer.
Before applying the first (primer) layer, are carried out cleaning of 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 microelectron the th industry to create a cheap and fast processors. The application of carbon nanotubes filled with zinc, in the paint industry can not only reduce the cost of production of corrosion-resistant materials, but also to increase the duration of maintenance-free operation up to 30-35 years. The use of carbon nanotubes filled with zinc, can achieve optimal results with minimal cost.
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 carbon nanotubes with zinc for different operating conditions.
|Primer paint layer||Intermediate paint layer||Top coat Quantity: nanotube / nanotube with Zn in volume. %||The approximate thickness of the entire coating, mcm||Life coverage|
|Quantity: nanotubes with Zn in volume. %||Estimated layer thickness µm||Quantity: nanotubes with Zn in volume. %||Estimated layer thickness, microns||N1||F1|
|Note: N1 - mind is provided for the climate; F1 - cold climate.|
1. Anti-corrosion primer coating for protection of steel structures made of paint material based on film-forming and containing carbon nanotubes, characterized in that the coating contains carbon nanotubes filled with zinc.
2. Anti-corrosion primer coating according to claim 1, characterized in that the coating contains from 40 to 86 vol.% carbon nanotubes filled with zinc.
3. Multi-layer anti-corrosion coating to protect the metal-containing primer layer, intermediate layer and surface layer, characterized in that it contains a primer layer according to claims 1 and 2 of a thickness of 40-100 μm, the intermediate layer is a primer layer according to claims 1 and 2 of a thickness of 70-90 microns, and a surface layer made of a paint and varnish material containing carbon nanotubes, not filled with zinc, and with a total thickness of 90-240V microns.
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.
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.
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.
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: thermo-setting heat-activated paint compositions, application of such composition on substrate.
SUBSTANCE: proposed composition contains at least one amorphous binder at Ts below 5C and/or at least one crystalline or semi-crystalline binder at melting point or interval of melting points below 150C, at least one epoxy resin, at least one polyamine including cyanamide groups, at least one blocked or latent catalyst in the amount of 0.5-5 mass-%; this catalyst is deblocked or activated at elevated temperature below hardening temperature of paint composition. Paint composition is characterized by Ts below 5C and viscosity below 2000 mPa·sec measured at temperature of 80C and shift rate of 10 c-1. The method of application of coat to substrate includes the following stages: first, paint composition is heated to temperature of application, then, composition is applied on substrate and paint thus applied is heated to temperature of its hardening till complete hardening. Paint composition is used for application onto mirror reverse surface, onto metal surface or onto substrate sensitive to heating. This composition forms thin anti-corrosive coat free from volatile organic compounds which may be used at temperature of application between 100 and 160C by employing the methods of application at low temperatures.
EFFECT: enhanced efficiency.
15 cl, 3 tbl, 9 ex
FIELD: building materials.
SUBSTANCE: invention relates to formaldehyde-base aqueous binding compositions, insulating materials based on such compositions, and to a method for using these compositions for making fiberglass insulating material and related fiberglass articles. Invention proposes a binding composition comprising mixture of water and thermally hardening adduct representing practically infinitely diluted with water or dispersed in water that is formed in the esterifying reaction of components of monomeric polycarboxylic acid and monomeric polyol. Also, invention relates to a method for binding freely woven mar made of glass fiber by the proposed composition and to the prepared material made of glass fiber. Articles made of the proposed fiberglass can be widely used in building.
EFFECT: improved and valuable properties of composition and material.
13 cl, 8 ex
FIELD: rubber industry; production of rubber mixes used for manufacture of collar seals for oil equipment.
SUBSTANCE: proposed rubber mix contains the following constituents, mass-% (per 100 parts by mass of rubber): butadiene-nitrile rubber Grade БНКС-40AM and БНКС-40AMH, 80.0; hydrogenated butadiene-nitrile rubber Grade БНКВ, 40-30; Terban, 20.0; sulfur, 3.5; sulfenamide M, 0.50; altax, 0.50; stearic acid, 1.00; colophony, 2.0; dibutoxyethyl adipate, 11.0; white carbon, 5.0; zinc white, 4.0; diafen, 2.0; commercial carbon П-803, 20.0; commercial carbon П-245; modifying agent РУ-Д, 2.0; aramide or polyamide fibers, 10.00.
EFFECT: enhanced tear resistance of vulcanizing agents; increased service life of collar seal; possibility of using collar seals at low temperatures.
FIELD: rubber industry.
SUBSTANCE: invention relates to rubber compounds used in tire manufacture, in particular to rubber compounds for manufacturing low-hysteresis treads of fuel-sparing tires showing improved bite properties. Reduced-density curable polydiene-based rubber compound comprises precipitated silica extender, silane binders, and target additives, said silane binders rubber compound containing triethoxysilyl-propyl-mercaptobenzothiazole sulfide combined with bis[3-triethoxysilyl-propyl] tetrasulfide at ratio between 0.3 and 3.3 and in summary proportion to percentage of precipitated silica extender between 0.097 and 0.133.
EFFECT: reduced hysteresis in tread rubber at 60°C, enhanced hysteresis and bite properties at 0°C and simultaneously reduced residual compaction after repetitive deformations and increased wear resistance of rubber.
2 tbl, 2 ex