The method of isolation of elements of structures in aggressive environments
(57) Abstract:Usage: to protect the cathodes in the electrowinning cells to obtain pure metals. The inventive method of isolation of elements of a design consists of applying three layers with an interval of 15 to 30 minutes between each layer of polymeric composition containing methyl methacrylate 100 hours, polybutylmethacrylate 10 to 70 hours, butylmethacrylate 5 - 60 h, the polyisocyanate 10 to 40 hours, dimethylaniline 0,05 - 2,00 PM, divinylbenzene 0,1 - 10,0 h, benzoyl peroxide is 0.1 to 10.0 hours, perhlorvinilova resin of 0.5 to 25.0 hours, diethylaminotoluene 0,01 - 0,50 h, Amin 0,01 - 1,00 o'clock, when this composition for intermediate layer further comprises silicon carbide. Curing of the coating 3 to 4 hours, a full 10 days. table 2. The invention relates to the field of metallurgy for the protection of structures operating in harsh environments. Most preferred is the use of the invention for protection of the cathodes in hydrometallurgy, where there is a corrosive environment in liquid and gas phase, in particular chlorine, fluorine, etc., it is Preferable to use it to protect the cathodes in the electrowinning cells to obtain pure metals.The task of the invention to improve the adhesion strength of the protective tx2">There is a method of protecting structures in aluminium production in hydrometallurgy by drawing on the protected surface compositions of various materials, for example,  as the protective composition used polyethylene, paraffin and ceresin.The disadvantage of this method is the low adhesive strength, low chemical resistance at elevated temperatures. These shortcomings do not allow to apply the method to protect structures, chemical tanks, baths, basins, etc. where the protective coating must withstand temperatures of 85 - 150oC.Closest to the proposed effect to the technical essence and the achieved positive effect is a way of protecting structures by layer-by-layer deposition on the surface of the polymer composition based on acrylate resins, modifier, filler, hardener, for example,  Obtained in a known manner, the coating has a high resistance, bond strength. The disadvantage is the low chemical resistance at elevated temperatures and low adhesive strength. Samples of coating soften and peel off when boiling even in clean water after 0.5 hThe purpose of izopet the Onno-active environments.The essence of the invention: on the insulated surface is applied polymer composition based on acrylate resins, modifier MDI and optionally butylmethacrylate, divinylbenzene, diethanolamine, perchlorovinyl resin and amine, in the following ratio, wt.h.The methyl methacrylate 100
Polybutylmethacrylate 10 70
Butylacrylate 5 60
The polyisocyanate 10 40
Benzoyl peroxide is 0.1 to 10
Dimethylaniline 0,05 2,0
The divinylbenzene 0,1 10,0
Perchlorovinyl resin is 0.05 to 25.0
Diethanolamine 0,01 0,5
Amin 0,01 1,0,
moreover, the layers of the composition is applied at least three layers with an interval of 15 to 30 minutes between each layer and the middle layer is injected filler in the form of silicon carbide. As filler in the composition is injected silicon carbide in the amount of 150 to 300 wt.h. by weight of the resin, and is used as an amine diamine UE-633 MIn the coating, applied the proposed method provides the three-dimensional spatial structure of the coating by copolymerization (stitching) linear methyl methacrylate (MMA), butyl methacrylate (BMA) and divinylbenzene, as well as due to the interaction of MDI with diamine and moisture.Diethylaminotoluene (DEAM) is a surface-active agent that allows to adjust the level of the adhesive interaction in the system, in addition, the presence of nitrogen atoms causes the effect of reducing the rate of polymerization system with its Supplement. TEAM paired with DVB network superlicence the effect of increasing the adhesive strength of the composition. The introduction of the insulating coating MDI promotes the curing of the composition on wet surfaces, and to reduce inhibition effect of oxygen and increase the strength of the boundary layer between the coating and the metal due to the formation of physico-chemical bonds with the active groups.Introduction perchlorovinyl resin (PSC), which acts as kislotostojky supplements due to the presence of long regular chain and the presence of chlorine atoms, provides resistance of the applied coating to Aqua Regia, concentrated phosphoric acid, chromic acid mixture, oxidation-type potassium permanganate solutions of salts.The introduction of CR carbide is the second song on the protective surface (metal, concrete is the adsorption of low molecular weight MMA, BMA, molecules PSC is not protected surface and particles of silicon carbide, which ensures reliable protection against penetration of corrosive ions at the boundary: protecting the surface of the polymer coating. This coating Amin plays the role of stabilizing additives preventing the polymerization of the monomer. Additionally, the introduction of amine stabilizer makes the floor its environmentally friendly in utverzhdenii songs all supplements are linked into a three dimensional polymer network that provides its high strength under impact loads.The invention can be implemented as follows.Example 1. Subject to the protection of the surface of the structure clear of foreign objects. Then prepare the polymer composition in the mixer. The powder PBMA in the amount of 10 wt.h. mixed with 0.5 wt.h. PUA, the mixture of powders was dissolved in 100 wt.h. MMA and 5 wt.h. of butyl methacrylate at room temperature and under stirring. Next enter at careful hashing 0.01 wt. including TEAM, mix and enter 0.5.h. DVB and 0.05 wt.h. DMA, mix, and inject 10 wt.h. MDI and at least La on the insulated surface layers with an interval of 15 to 30 minutes Curing of the coating 3 to 4 hours, and the full 10 days. Insulated offered by way of the metal plate were tested under the influence of different environments. The test fungi were glued to these coated surfaces: we determined the force of detachment of the coating from the metal plate after exposure in aggressive environments.The results of the tests are presented in table. 1.The destruction of samples in all cases wore cohesive character (for layer coating).Example 2. The insulated design of the bath (pool) for a cell with aluminum cathodes for zinc smelter amounts, clean sand blasting apparatus and degrease. The electrolyte composition: chlorine up to 90 mg/l of fluoride to 60 mg/l, sulfuric acid, up to 160 g/l To prepare an insulating composition according to the present invention uses ingredients:
Polybutylmethacrylate THE 6-01-358-75
Methyl ester of methacrylic acid (TNM) GOST 20370-74
Butyl ester of methacrylic acid (BMA) The same
Polypropene, mark D. (apart from this brand can be used SIC grades B and E) THE 113-03-29-6-84
Perchlorovinyl resin brand PSC-LS OST 6-01-37-88
The catalyst dimethylaniline GOST 2168-88
The initiator benzoyl peroxide triamine (yn-0633) THE 0-05-1863-78
Diethylenediamine THE 6-09-4234-77
The condensation products of formaldehyde and phenol with Diethylenetriamine (yn-D)
Preparation of a composition for coating is carried out in the sequence described in example 1.After application of the insulated coating and curing it, it was tested for adhesive strength in the air and in the environments in accordance with GOST 14760-69 "Method for the determination of strength at the margin". While determining the adhesion strength of coatings in various environments is determined by exposure in environments within 360 days of steel plates with a coating thickness of 0.3 mm, then after some time the surface of the coating paste "fungus" and record the force at isolation of the fungus from the surface.Determine the corrosion rate through the coating material in accordance with GOST 12020-72 "Plastic". Method for determination of resistance to chemical environments, and hydrolytic resistance in hours boiling in water.The impact resistance of coatings experience in accordance with GOST-4763-73. On derivatograph system Paulik Paulik Erdei was determined temperature of the beginning of weight loss and loss of 0.5% of the mass.Production tested is de electrolyte are presented in table. 2.Insulating layer reliably operated for 3 months. Then began peeling from the metal. Thus, four coating the surface of the structure during the year provides considerable benefits. Compared with the prototype it greatly improves the performance characteristics of the coating.The advantage of the proposed method of isolation is that insulation work can be carried out both in air and in various aqueous solutions in the temperature range from -5 to +60oC. the Viscosity of the composition for insulation 700 SP, it can be increased by the introduction of fillers: the gelation time of 1.5 h, the full cure time is adjustable. As can be seen from the above materials only silicon carbide provides obtaining corrosion resistant coating, ensuring reliability of the coating during operation of objects at high temperatures. It can be assumed that the effect is caused by chemical interaction of the surface layers of silicon carbide with such system components as the polyisocyanate, methyl methacrylate, acrylates, amines.Additionally, when the mixing of all components of the system, the isocyanate vzaimode the/P> The method of isolation of elements of structures in aggressive environments by layer-by-layer deposition on the surface of the polymer composition based on acrylate resins, characterized in that the polymer composition contains, by weight.h.The methyl methacrylate 100
Polybutylmethacrylate 10 70
Butylmethacrylate 5 60
Benzoyl peroxide 0,1 10,0
The polyisocyanate 10 40
Dimethylaniline 0,05 2,00
The divinylbenzene 0,1 10,0
Perchlorovinyl resin 0,5 25,0
Diethanolamine 0,01 0,50
Amin 0,01 1,00
applied consistently in three layers with an interval of 15 to 30 minutes between applying each layer, the composition for intermediate layer further comprises silicon carbide.
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.