Method of corrosion protection of metal surfaces
(57) Abstract:The invention relates to a method of protecting metal surfaces of large structures and pipelines. When developing method aims to simplify the process of corrosion protection by increasing the adhesion of the coating material is polyurethane foam, including residual corrosion products on the metal surface. The essence of the method lies in the fact that you are doing the layering of polyurethane foam, in which the polyol as one component of the material applied in the first layer, pre-enter 8 - 10% wt. modified stabilizing rust powder (TU 2310-001-16985624-93), the following protective layers formed by pouring or spraying a polyurethane material selected from a number of hydro-, heat - or teplostojkih its modifications. When implementing the method are provided with a high protective properties of the coating on the rusty metal surface while increasing the structural strength of the product and, if necessary, giving the floor insulation and other properties. table 1. The invention relates to a method of protecting metal rusty p security (CCS) large-scale structures and pipelines, coating materials (paints) on the basis of various film-forming (guiding material Coating paint for corrosion protection of internal surfaces of steel tanks", CSRL, Goskompriroda, , Astrakhan, 1985). However, in some cases, the requirements of the CCS will deliver a performance that do not have coverage of coatings, such as thermal insulation properties and increase the structural strength of the products.The known method of surface protection, including surface preparation, spraying or pouring polyurethane foam. If necessary, you can apply an additional protective coating (G. A. Bulatov "Polyurethanes in modern technology) engineering, 1983, S. 170 171).However, this method involves a preliminary thorough surface treatment that increases the cost and complicates its implementation.Solved the problem in the development of the proposed method is to simplify the process of CCS by increasing the adhesion of the coating material, including residual corrosion products on the metal surface.When implementing the proposed method provides high protective properties of the coating on the rusty metal surface while increasing the structural strength of the product and, if necessary, make the coating insulating and other properties.With the fact a coating of polyurethane foam by the method of filling or layer-by-layer deposition, according to the invention, a pre-applied layer of the composition of the polyurethane, polyol as one component which is injected 8 10 wt. modified stabilizing rust powder (TU 2310-001-16985624-93), then subsequent form protective layers from the original polyurethane composition, selected from a number of hydro-, heat - or teplostojkih modifications.This additive containing the first layer of polyurethane coatings, not only stabilizes the rust, but showing a surface-active action contributes to the increase in the content of closed pores and their uniform distribution in the volume of this layer. In addition, multifunctional additives (contains phenolic hydroxyl, quinoid and ether groups) significantly increases the adhesion of the polyurethane to rusty surfaces.The method is as follows.The metal surface of the tank, made of steel grade St-3, mechanically cleaned from mud, reservoir and loose rust to the thickness plotopteridae rust of not more than 100 μm, then degrease the petrol BR or white spirit.Usually use polyurethane foam, consisting of two components And the ponent And previously administered 8 10 wt. modified stabilizing rust powder (SMEs) (TU 2210-001-16985624-93), which is a polyfunctional stabilizing rust additive with pH>7, which is a modification of powder carolynne (TU 64.11.05-87) in the form of heavy byproduct of the chemical processing of vegetable raw materials, which in the process of oxidative and hydrolytic degradation and processing amines turns into a polyfunctional reactive mixture oligosaline molecular weight of from 5000 to 15000 srvc. units appearance SMEs: free flowing fine powder dark brown color with low specific smell. Granulometric composition of at least 95 wt. submitted by particles of 10 to 15 μm, the specific gravity of 0.4 to 0.5 g/m3the moisture content is not more than 5 wt.After thorough mixing, the SME component And put the first protective layer together with the component B of polyurethane foam using installation Foam. The layer thickness of up to 0.5 cm in 10 to 15 minutes put successively the following layers selected brand polyurethane foam without adding SMEs to achieve the optimal thickness of the protective coating of 1.5 30 cm or perform the fill.The table presents the specific formulations of panopolis erosional protection of metal surfaces by applying coatings of polyurethane foam-based polyol and MDI pouring or spraying, wherein the pre-to the surface put a layer of polyurethane foam, polyol as one component of which enter 8 10 wt. modified stabilizing rust powder, used polyurethane foam selected from the group including hydro-, heat - or teplostojka its modifications.
FIELD: chemical industry, paint-vehicle systems, in particular heat protective dyes.
SUBSTANCE: claimed dye contains ceramic and corundum microspheres; resins, selected from group including silicone resin, polyesterepoxy resin, acrylic resin dispersions as binder; pigment; and aluminum powder as deflector. Such composition provides reduced heat loss into environment. Obtained dyes have thermal gradient, improved heat-retention properties and strength, and useful in corrosion and heat-loss protection of building construction, transport, gas and oil lines, heating systems, etc.
EFFECT: easier method for dye production; strength and homogenous heat protective dye layer of improved adhesiveness.
2 cl, 3 tbl
FIELD: polymer materials and corrosion protection.
SUBSTANCE: invention relates to cold-drying anticorrosive coating compositions, which can be used in petroleum, gas, power, chemical, and other industries for protection surfaces of iron articles and structures. Composition of invention is based on binder, namely alkyd-styrene resin or poor alkyd resin in amount 11.0-44.0%. Composition further comprises 0.3-5.0% tannin or tannin derivatives as anticorrosive additive, 3.0-24.0% pigments, 5.0-22.-% fillers, and balancing amount of organic solvent.
EFFECT: enhanced protective properties.
4 cl, 2 tbl, 5 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
FIELD: pipeline heat insulation in civil and industrial building.
SUBSTANCE: coating composition includes 5-95 vol.% of polymeric binder and 5-95 vol.% of hollow microspheres. At least one composition layer is coated onto substrate and dried. Said polymeric binder contains 10-90 % of (co)polymer selected from acrylate homopolymer, styrene-acrylate copolymer, butadiene-styrene copolymer, polyvinylchloride, polyurethane, vinylacetate polymer or copolymer or mixture thereof. Binder also contains 10-90 vol.% of water and surfactant mixture. hollow microspheres have particle size of 10-500 mum and bulk density of 50-650 kg/m3, and made from glass, ceramic, polymers, sol or mixture thereof.
EFFECT: improved corrosion resistance and heat insulation of coated substrate; increased adhesion properties.
5 cl, 1 tbl, 1 ex, 3 dwg
FIELD: organic chemistry, in particular composition for corrosive and chemically stable coats.
SUBSTANCE: invention relates to alkyd-epoxy undercoat compositions based on debris from phthalic anhydride and epoxy resin distillation. Claimed composition contains (mass %) epoxydianic resin 45.0-45.4; modified alkyd resin obtained by stepwise esterification of sun flower oil, polyhydric alcohol and slop from phthalic anhydride distillation with grain-size classification of 0.05-1.1 mm and phthalic anhydride content of 37-80 % - 36.0-36.3; filler 4.9-5.5; pigment 3.5-3.8; balance: solvent; and over 100 mass % of composition it contains polyethylene polyamine as curing agent 15, and cobalt naphthenate as curing catalyst 1.8. Composition of present invention is useful in coating of metal parts and various constructions.
EFFECT: undercoat composition of high corrosion resistance, strength and lower cost.
2 tbl, 1 ex
FIELD: building materials.
SUBSTANCE: invention relates to a method for preparing compositions used for covers, among them to corrosion-water-fuel-resistant covers by nonferrous metals, concrete and ceramics in moisture and aggressive media. The composition comprises the following mass ratio of the parent components, %: film-forming mixture comprising oligomeric carboxyl-containing butadiene-nitrile rubber, 10.9-28.1 and epoxy-diane oligomer, 7.0-10.9 in the mass ratio of epoxy-diane oligomer and rubber from 19.9:80.1 to 50.0:50.0; hardening agent, 5.9-18.1; solvent, 41.0-51.1; filling agent, 1.4-1.6, and pigment, 13.6-16.4. Film-forming agent is heated preliminary at temperature 90-120°C to the conversion degree of carboxyl groups 8.8-25.2%. Mixture of γ- and β-aminopropyltriethoxysilanes is used as a hardening agent in the mass ratio = (67-75):(25-33), or 45-55% solutions of products of hydrolytic condensation of mixture of γ- and β-aminopropyltriethoxysilanes in cyclohexanone or toluene. Invention provides enhancing the strength of cover in direct/reverse impact, adhesion in moisture media, resistance to defoliation in storage and bending, to reduce swelling capacity in water.
EFFECT: improved, enhanced and valuable properties of composition.
2 tbl, 4 ex
FIELD: composition materials.
SUBSTANCE: invention relates to a method for preparing the composition cover that can be used for recovery worn out article surfaces working under conditions of high compression loadings, bearing surface of lateral framework in loading truck car in zone of slipping aperture. Method involves mixing the polymerizing epoxy composition and metallic dispersed filling agent in the ratio = (1:6)-(1:9) mas. p. p. Mixing is carried out at effect in increasing pressure in auger mixer with alternate step being each the following auger step differs from previous step by the constant value. Then the prepared composition is applied on metallic surface and kept its at the polymerization temperature up to finishing the solidification process. Composition based on epoxy resin ED-16, ED-20 with latent hardening agent dicyandiamide is used as epoxy composition. Iron powder PZH-4, iron-base powder PS 27-M, iron-base PG-USCH-35, nickel-base powder PG-SP2-M are used as a metallic dispersed filling agent. Invention provides enhancing the specific compression loading value.
EFFECT: improved method for preparing, valuable properties of cover.
5 cl, 1 tbl, 1 dwg, 6 ex
FIELD: metal-protecting materials.
SUBSTANCE: invention relates to protection of metals against corrosion using paint and varnish coatings. Invention proposes using as anticorrosive pigments co-precipitated manganite-phosphates, manganite-silicates, manganite-sulfates of metals of the general formula: MMnOxnMZ wherein M means Ca2+, Zn2+, Fe2+, Sr2+ at Z - PO4 3-, SiO3 2-, and M means Ba2+ at Z - SO4 2-, PO4 3-, SiO3 2-; x = 2.5-3; n = 0.5-10 with the content of co-precipitated manganite of corresponding metal from 5 to 70 wt.-% as anticorrosive pigments. Proposed pigments by their anticorrosive properties exceed that of zinc tetraoxychromate. Invention provides applying low toxic anticorrosive pigment-inhibitors with protective properties comparable with that of chromate pigments.
EFFECT: expanded assortment of anticorrosive pigments.
FIELD: polymeric protective coatings.
SUBSTANCE: invention relates to compositions forming anticorrosive coatings on reinforced concrete, concrete, and bricks and which, in particular, can be employed for anticorrosive protection of concrete floors, large-size metallic containers, pipelines, brick basements, bottoms, cattle-breeding farms, open-type swimming pools, and also air conduits, piping, and other metallic structures in industrial buildings, and near production enterprises producing corrosive emissions into atmosphere. Coating according to invention is composed by copolymer obtained via copolymerization of vinyl ether with methyl methacrylate at weight ratio (3-6):1 in presence of azo-bis-isobutyronitrile followed by dissolution of copolymer in toluene. Vaporization of the latter leaves film protecting surface from destruction.
EFFECT: enhanced protection efficiency.
FIELD: paint and varnish materials.
SUBSTANCE: invention relates to priming aqueous-dispersion compositions designated for protection metallic surfaces against corrosion in exploitation both under atmosphere conditions and subjected for effect of different liquids. Invention proposes anti-corrosive aqueous-dispersion priming-enamel comprising the following components, wt.-%: styrene-acrylic dispersion as a binding agent, 30-50; calcium molybdate phosphate as an anti-corrosive pigment in the following ratio of molybdate and phosphate ions from 1:0.01 to 1:100; color-forming pigment, 1-10; phosphate dispersing agent, 0.1-10; thickening agent, 0.05-0.2, and water, the balance. Applying calcium molybdate phosphate in priming-enamels provides the passivating activity in interaction 0f phosphate-molybdate ions with metallic backing of both ferrous and nonferrous metals and exhibits the additional protecting effect.
EFFECT: improved and valuable properties of compositions.