Undercoat-rust solvent

FIELD: chemistry.

SUBSTANCE: invention relates to undercoat-rust solvents which prevent metal corrosion and are designed for preparing metal surfaces for painting without removal of corrosion products first and can be used, for instance for treating large structures made from low-carbon steel: bridges, electric power pylons, external and internal surfaces of carriages designed for transporting aggressive material, in particular mineral fertilisers in mildly cold and wet climatic conditions. The undercoat-rust solvent contains foamed polystyrene, potassium ferrocyanide (yellow prussiate of potash), orthophosphoric acid (70%), butylacetate as a solvent and azimido-benzene as a corrosion inhibitor.

EFFECT: obtaining a composition of an undercoat-rust solvent with optimum viscosity, flow behaviour, shorter drying period of the coating, formation of a protective film on the metal surface which prevents further corrosion of the metal, as well as improved physical and mechanical properties of the coating and increased corrosion resistance of the treated objects in the said aggressive media and improved sanitary-hygienic labour conditions.

3 tbl

 

The present invention relates to paints, varnishes and lacquers, namely soil-rust converters, preventing corrosion of metal and designed to prepare the metal surface for application of paint coatings without prior removal of corrosion products.

The invention can be used in various industries, construction, transport, preferential treatment of soil-Converter large-scale structures from low-carbon steel: bridges, power transmission line supports, exterior and interior surfaces of cars designed for transport of aggressive substances, in particular of mineral fertilizers in a moderately cold and humid climate.

Known composition (Patent RF №2120495, IPC SS 22/13, Appl. 1997.03.17, publ. 1998.10.20) for treatment of metallic surfaces without prior removal of corrosion products, including, wt.%: phosphoric acid (80%) 50,0-60,0, nitrate zinc 2,5-3,0, potassium releasescontact 3,0-4,0, fluorocarbon connection 0,3-0,6, water the rest. Sign in common with the claimed ground-rust, is the presence of a known composition of phosphoric acid and potassium releasescontact as components that convert the corrosion products. Processing the surface of the metal is known as the composition as well as stated by the soil-rust, prevents corrosion of the metal and creates on its surface anti-corrosion coating that serves as a primer for coating materials.

The disadvantage of this structure is the large amount of phosphoric acid, which reacts not only with iron oxide, but also by the metal. This forms a hydrogen, part of which is in atomic form occluded metal, and then desorbed in the form of gas, to cause peeling of the coating. The structure also includes a large amount of water that can remain under the protective film and to cause corrosion of metal. Due to the large amount of water included in the composition of rust Converter, it is applicable for surface treatment of metal only at zero temperature of 18-23°C.

Also known composition used as the primer-rust e-WA-01 gisi (TU 81-05121-78 "Ground-Converter e-WA-01 gisi"; Voitovich, VA, in the book. Illustrated and other Protection of metals from corrosion coating. - M.: Chemistry, 1987, 164), which is a coarse plasticized polyvinyl acetate dispersion with the addition of orthophosphoric acid, potassium relatoseroticos, potassium releasescontact OP 10 and OP-7, ethyl silicate - 40 and water. It is designed to handle is poverhnosti metal without prior removal of corrosion products. Sign in common with the claimed ground-rust, is the presence of a known composition of phosphoric acid and potassium releasescontact as components that convert the corrosion products.

The disadvantages of this structure are low resistance, weather resistance and durability of the primer coating, and the barrier effect of the film of the soil in relation to water and water solutions of corrosive substances is small.

The aim of the invention is a composition of the soil of rust Converter with optimum viscosity, filling, accelerated drying time of coatings formation on the metal surface of the protective film that prevents further corrosion of the metal, as well as the improvement of physical-mechanical characteristics of the coating and increase the corrosion resistance of the processed products in these aggressive environments.

This is achieved by the fact that the composition of the soil of rust Converter comprising a polymeric binder, a solvent, potassium releasescontact, orthophosphoric acid, is introduced as a polymeric binder is polystyrene, rastvoritelya - butyl acetate and corrosion inhibitor - asimadoline, in the following ratio, parts by weight:

polystyrene 15-25
butyl acetate40-70
potassium releasescontact5-16
phosphoric acid (70%)3-10
asimadoline0,15-0,3

In the inventive ground-rust Converter use standard components manufactured: polystyrene grades PS-1,2,4 (for foam polystyrene take a mechanical mixture of the emulsion of polystyrene and compounds that decompose at elevated temperatures with gaseous products or trademarks of PS-B obtained in the process of the suspension (bead) polymerization of styrene containing dissolved therein the liquid isopentane blowing agent, or the products of expanded polystyrene, are unsuitable for further use, butyl acetate technical grade GOST 8981-78, potassium releasescontact GOST 6816-79, phosphoric acid 70%technical, improved THE 2142-002-00209450-96 and asimadoline "h" C6H5N3THE 6-09-1291-75.

Used as a corrosion inhibitor asimadoline, Malm 119,13, is a colorless crystalline substance, having a melting point 96-98,5°C; soluble in alcohol, benzene and practically insoluble in water.

Previously asimadoline as a corrosion inhibitor was not used; used in analytical chemistry for separation of Cd and Ni, as a reagent for the gravimetric determination of Ag(I), Cu(II), Zn(II), Os(VIII) and titrimetric determination of Ag(I); antiguabarbuda substance in pictures (Chemical encyclopedia: 5 so: vol. 1: A-Darsana/Ed. Nr.: Knunyants I.L. and others - M.: Owls. day., 1988, s).

The joint presence of each of these components in a certain ratio in the inventive composition of soil-Converter provides high adhesive-cohesive strength of coatings and the corrosion resistance of the processed products, and can also serve as a self-protective coating of metal into interim period to period, depending on the degree of aggressiveness of the environment, and primer coating, matching well with other paints such as enamels type ML, PF, SC, BT.

The reaction of bivalent iron ions with phosphoric acid to form the acid phosphates of iron. Potassium releasescontact, reacting with them, turns them into an insoluble compound "Prussian blue", covering the main part of the metal surface. Organic additive effect on the parameters of the passivation of the metal, increases the adhesion strength of the film to the substrate and thus improves its protective properties, is a properly selected solvent allows to achieve optimal results in the field of adhesive-strength characteristics of the coatings to the substrate and to obtain the ground-Converter optimal consistency.

When the content in the composition of the butyl acetate is less than 40 parts by weight increases the viscosity of the solution, the film loses its elasticity and hampered uniform deposition of soil on the surface of the metal.

When the content of the butyl acetate more than 70 parts by weight of observed spreading soil-Converter when applied to a rusty surface.

When reducing the polystyrene content less than 15 parts by weight decreases the working viscosity of the composition and hiding power, there is a thinning of the polymer film on the treated surface, which causes the penetration of water and other corrosive compounds to the metal substrate.

The increase in the content of EPS more than 25 parts by weight makes the song hard and sticky.

The content in the composition of potassium releasescontact less than 5 parts by weight leads to a weakening of the transformative capacity of soil-Converter rust and reduce the opacity.

The increase of the content in the composition of potassium releasescontact more than 16 parts by weight makes the coating is not elastic, viscous and leads to leaching of unreacted potassium releasescontact of the polymer film, forming in her pores.

When the content in the product phosphoric acid is less than 3 parts by weight of sharply labeleda its transforming ability.

Increasing the concentration of phosphoric acid above 10 parts by weight of the actuator is t to the dilution of the composition and may cause the emergence of a second metal corrosion under the coating.

Upon decrease of the concentration of asimadoline in the composition of less than 0.15 parts by weight it loses its inhibitory ability at a given ratio of components and reduced adhesion of the film of the primer to the substrate.

The increase in the content of the corrosion inhibitor more than 0.3 parts by weight leads to excessive reagent.

Technology of preparation of soil-rust

1. Cooking basics of soil-Converter.

Cooking basics of soil-Converter produced by dissolving polystyrene and asimadoline in butyl acetate under stirring for 30-40 minutes at a temperature of 18-24°C. Asimadoline completely soluble in butyl acetate, but it can be separately dissolved in a small amount of butyl acetate and enter the basis.

2. Preparation of soil-Converter.

Pre-pulverized in a mortar or a laboratory mill and sieved through a sieve with the hole diameter 0.125 mm potassium releasescontact add to the basis of soil-Converter and load into the disperser, representing a ball mill with a fill factor of balls 45% vol. and stirred until a homogeneous mass of white or gray color.

Example 1

1. Cooking basics of soil-Converter.

Dissolved 15 parts by weight of polystyrene and 0.15 parts by weight of asimadoline 40 parts by weight of BU is racette with constant stirring for 30-40 minutes at a temperature of 18-24°C.

2. Preparation of soil-Converter.

Pre-pulverized in a mortar or a laboratory mill and sieved through a sieve with the hole diameter 0.125 mm potassium releasescontact 5 parts by weight is added to 55,15 parts by weight of the basics of soil-Converter and load into the disperser, stirred until a homogeneous mass of white or gray color. The obtained ground-Converter discharged from the disperser and poured in small portions with continuous manual or mechanical stirring, 3 parts by weight of 70%phosphoric acid. Technology of preparation is the same for all compositions of example 1, table 1.

To use the soil-Converter must be no earlier than 30 min after the introduction of the phosphoric acid to stabilize the composition. The shelf life of ground-Converter rust, prepared according to example 1, no more than 24 hours

Example 2

For long-term storage of soil-Converter prepares a two-part system: the base and the acid diluent Packed in different packaging. In this case, 70%phosphoric acid is introduced into the basis immediately before use and the resulting soil-Converter used within 24 hours Dissolve 24,94 parts by weight of polystyrene and 0.25 parts by weight of asimadoline in 66,50 parts by weight of butyl acetate under stirring for 30-40 minutes at a pace which the atur 18-24°C. Next enter 8,31 parts by weight of potassium releasescontact, pre-pulverized in a mortar or a laboratory mill and sieved through a sieve with the hole diameter 0,125 mm, Then 100 parts by weight of the obtained bases loaded in the disperser and mixed until a homogeneous mass of white or gray color. Before use in Foundation soil-Converter in continuous manual or mechanical stirring enter 70%orthophosphoric acid in the ratio of 100:5 (parts by weight) composition 1. Technology of preparation of soil-rust Converter in the form of two packages of the system is the same for all compositions of example 2, table 1.

You can use ready ground-Converter must be no earlier than 30 min after the introduction of the phosphoric acid to stabilize the composition. Ready ground-Converter can be applied to the surface processamento with metal corrosion products of a thickness not exceeding 100 μm.

For comparative tests use a known composition (prototype) and the proposed composition of the soil of rust Converter.

When preparing samples for testing using samples of corroded steel 3 with a thickness of 0.8-0.9 mm, a size of 70×150 mm, the thickness of the corrosion products on the plates does not exceed 100 μm, and ranges from 50 to 90 μm. Before applying soil-Converter R is avchina plate clear of the loose formation of rust, poorly connected with the metal surface using a wire brush, in the presence of oil pollution, degreased with acetone.

The quality of the composition of the soil-Converter appreciate bottling, time practical drying and viscosity (table 2).

On the viscometer VZ-4 determine the viscosity at 20°C. the prepared soil of rust Converter. Further, the ground-rust Converter applied on the prepared samples with a brush, sponge, spray or airless spray, depending on the area of painting works. The coating is applied in two layers. Before applying the second layer determines the thickness of the single-layer coating on an electronic thickness gauge CONSTANT-K5, the measurement accuracy of 0.001 mm table 2 shows the average values of the film thickness on the basis of eight measurements for each coverage. When applying each layer determine the practical drying up of degree 3 at 20°C. the Filling of the soil-Converter assessed visually at a time after which disappear strokes when applying the primer with a brush. Filling satisfactory if the strokes disappear after 20 min after application, and good, if the strokes disappear in less than 10 minutes after coating. After exposure of samples with coatings within 48 h of their experience.

Physico-mechanical properties of coatings estimates shall provide for the following indicators: water GOST 9.403-80, adhesion by the method of cross-hatch test GOST 15140-78, the strength of the film at impact GOST 15140-73, the strength of the film bending GOST 6806-73, the film hardness by pendulum device me-3 GOST 5233-67 and modifying ability. The results are given in table 2.

Corrosion tests carried out as follows.

The samples coated with the coating is immersed in a corrosive environment: 3%aqueous NaCl solution, 13%aqueous solution of NH4NO3, a 13%aqueous solution of NH4Cl and 13%aqueous solution of double superphosphate, the exposure time is 1 month.

Atmospheric testing is carried out in closed executor over pairs of artificial sea salt (composition shown in table 3) at a relative humidity of 100% for 2.6 months and over pairs of aqueous solutions of salts of NH4Cl and K2SO4at 100% relative humidity for 5 months.

In each corrosive environment is carried out on 3 parallel experience with the known and proposed compositions. After the exposure time of the samples extracted from environments, washed under running water with a brush and dried in air for 48 hours After the specified time determine the area of fracture coatings in %, then a sharp scalpel floor removed and determine the area of sub pellicle corrosion of the base metal. The results of the corrosion test the deposits are given in table 3.

Thus, from the data presented in table 2 and 3, it is seen that the inventive primer (rust Converter has significant advantages: more waterproof-and atmosphere, has better adhesion to the substrate, accelerated practical drying, optimum viscosity and good filling, compared with the known ground-Converter, designed to achieve the same goal, namely the ability to form on the surface of the metal anti-corrosion coating without time-consuming removal of corrosion products on the metal.

The coverage of ground-Converter can serve as the basis for applying other coatings, and self protective coating on the interim period from 1 to 5 months depending on the degree of aggressiveness of the environment.

2
Table 2
Comparative table of products quality and physico-mechanical properties of the films proposed composition and prototype
IndicatorsThe proposed compositionKnown composition (prototype)
13
The resistance (GOST 9.403-80), 20 daysstablestablestablethe peeling of 2 hours
The practical drying up of degree 3 at 20°C, min.45454590
Viscosity at 20°C VZ-4 (GOST 8420-74)18222660
Bottlinggoodgoodgoodsatisfactory
The thickness of the single-layer coating, mcm30303025
Adhesion by the method of cross-hatch test (GOST 15140-78), score2112-3
The strength of the film at impact (GOST 15140-73), kgf is cm 35404535
The strength of the film bending (GOST 6806-73)mm3311
The film hardness by pendulum device me-3 (GOST 5233-67), usled0,620,640,680,18
Modifying ability, d2221

td align="left">
Table 3
Comparative table of corrosion resistance of steel St3 covered by the proposed ground-Converter and prototype
Corrosive environmentThe exposure time, monthsOptions coatings*Demolition area coverage %Area sub pellicle corrosion St3, %
The atmosphere of artificial seawater composition:12,20,4
NaCl 27,021
Na2SO43,368
KCl 0,739
NaHCO30,2062,6
MgCl22,493
CaCl21,163
NaBr 0,085
(salinity 35,075 g/l) with a relative humidity of 100% 2100100
The atmosphere of aqueous solutions of salts of NH4Cl and K2SO4at a relative humidity of 100%511,20,2
2100100

Continuation of table 3
Corrosive environmentThe exposure time, monthsOptions coatings*Demolition area coverage %Area sub pellicle corrosion St3, %
3%aqueous NaCl solution116,40,5
2the peeling of 2 hours
13%aqueous solution of NH4NO3112,00,3
2the peeling of 2 hours
13%aqueous solution of NH4Cl115,30,6
2the peeling of 2 hours
13%aqueous solution of double superphosphate CA(H2PO4)2111,80,2
2the peeling of 2 hours
* Contacts coating:
1 - the declared ground-rust,
2 - the prototype.

The ground-rust preventing corrosion of metal and designed to prepare the metal surface for application of paint coatings without prior removal of corrosion products, including polymer binder, a solvent, potassium releasescontact, phosphoric acid, characterized in that the polymer with sousage composition comprises polystyrene, solvent butyl acetate, and as a corrosion inhibitor - asimadoline in the following ratio of components, parts by weight:

polystyrene15-25
butyl acetate40-70
potassium releasescontact5-16
phosphoric acid (70%)3-10
asimadoline0,15-0,3



 

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3 cl, 2 tbl, 9 ex

FIELD: chemistry.

SUBSTANCE: described is a method of making chromate anticorrosive pigment involving suspension of spent chrome-aluminium catalyst in aqueous solution of calcium nitrate and barium nitrate, taken in amount of 10-30% and 5-25% of the mass of catalyst respectively, in mass ratio of catalyst to the said nitrates equal to 65-70:30-35 respectively, dehydration of the obtained mixture with subsequent calcination at 800-900°C for 3-6 hours and grinding. The obtained pigment has anticorrosive effectiveness which surpasses that of the closest analogue by 6-40% and has lower cost.

EFFECT: use of pigment in ground coating improves anticorrosive properties of the coating and increases environmental friendliness.

1 cl, 1 tbl, 15 ex

FIELD: construction industry.

SUBSTANCE: invention refers to corrosion-resistant filler on the basis of lignified wastes of plant raw material, which is included in lacquer coatings and used for protection of metal surfaces against corrosion. Filler includes base made from lignified wastes of plant raw material crushed till powder is obtained, and amine-bearing addition. As lignified wastes of plant raw material, there used are fruit kernels (apricots, peaches, cherries, plums) and/or shells of nuts (walnuts, almond nuts, pistaches, coconuts, pine nuts, peanuts) or their composition with kernels of berries (grape, pomegranate, cornel), which are crushed to 5-40 mcm particle size. As amine-bearing addition, there used is monoethanolamine or triethanolamine.

EFFECT: filler has high corrosion-resisting properties and properties of rust solvent.

7 cl, 3 tbl

FIELD: chemistry.

SUBSTANCE: anticorrosion coating composition which can be used for protecting steel structures, objects and equipment from corrosion in atmospheric conditions and aqueous media, contains finely dispersed zinc powder, polystyrene and/or a copolymer of styrene with rubber, organic solvent and a rheological additive, and additionally a binder in form of a polyisocyanate prepolymer - aromatic polyisocyanate prepolymer based on diphenylmethanediisocyanate and moisture-absorbing additives. The finely dispersed zinc powder is obtained through physical vapour deposition. The moisture-absorbing additive used is tosylisocyanate and/or micronised highly porous crystalline aluminium silicat. The rheological additive used is bentonite or montmorillonite. The organic solvent used is a solvent of oil or xylene or butylacetate or methoxypropylacetate or white spirit or mixture thereof.

EFFECT: improved physical and mechanical and protective properties of the coating based on the composition, reduced presence of defects in the coating, reduced consumption of the composition, with preservation of protective properties, increased stability during storage and longer storage life.

8 cl, 4 tbl

FIELD: production processes.

SUBSTANCE: blemished surface is covered with polyester resins Derakane 8084 as primer coat, after drying surface is covered with at least two layers of powder-bonded glass-fiber mat and three layers of surface film as reinforcing layer, these layers are resinated by Derakane 411-350, rolled, after drying protecting cover as wax top coat based on isophthalic polyester is applied.

EFFECT: improvement of coating service life.

3 cl, 1 dwg

FIELD: chemistry.

SUBSTANCE: described is a heat resistant coating composition containing the following, wt %: polyorganosiloxane resin - 20-25, pentaphthalic lacquer - 8-14, isobutylmethacrylate polymer - 5-7, heat resistant pigment - 11-17, filler - 5-10, rheological additive - 1-2, thickener - 1-2 and organic solvent - the rest. The composition contains porous silicate in form of pearlite or kieselguhr, and the heat resistant pigment is aluminium powder or heat resistant pigments of different colours.

EFFECT: increased sedimentation resistance during storage and provision for coating with high resistance to physical and chemical effects.

3 cl, 2 tbl, 15 ex

Heat protective dye // 2245350

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

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