Composition for heat-resistant anticorrosive coating

FIELD: corrosion protection.

SUBSTANCE: invention is designed for use in oil and gas industry, mechanical engineering, in particular to protect internal surfaces of steel fuel tanks and mains, wherein all kinds of petroleum products or various organic solvents can be present. Composition contains 55-35 vol % pre-polymerized polyurethane based on tolylenediisocyanate and diethylene glycol, 35-55 vol % polytrifluorochloroethylene, and 5-10 vol % aluminum powder with particle size no larger than 20 μm.

EFFECT: achieved heat resistance of anticorrosive coating within a working temperature range ±50°C and protective properties of coating when surfaces are treated with steam at 150°C and pressure up to 6 atm.

2 ex

 

The invention relates to compositions used for anti-corrosion coatings in various industries. The invention can be used in the oil and gas industry and mechanical engineering, in particular, to protect the internal surfaces of steel fuel tanks and lines, which can contain all kinds of petroleum products or organic solvents.

Known composition for anti-corrosion coatings, including modified polyisobutylene copolymer bottoms distillation of styrene with anhydrides of acids, dibutyl phthalate, aluminum powder and xylene (SU 897818, published. 15.01.82).

Put it with a brush, roller or spray on a previously prepared surface in 2-4 layers. The drying time of one layer 30-40 min at 20°C. the Composition may be used for protection of steel pipelines used in various industries.

The disadvantages of the coating of this composition are the loss of the protective properties when processing water steam high pressure and temperature, which make for cleaning fuel tanks and vessels before changing their content. In addition, the composition of this song are toxic substances: xylene, styrene anhydrides, and dibutyl phthalate.

Also known composition for the Antico is Rodionova coverage based on the binder, which is used as alkyd-styrene resin or skinny alkyd resin in the amount of 11.0-to 44.0 wt.%, including anti-corrosion additive - tannin or derivative tannin in the amount of 0.3-5.0 wt.%, pigments 3,0-of 24.0 wt.%, fillers of 5.0 to 22.0 wt.%, organic solvent - rest (EN 2246512, published. 20.02.2005). The composition may be used in the oil industry for surface protection products and structures made of ferrous metals. As pigments used zinc phosphate, aluminum powder, carbon technical, tetrachromat zinc, red iron oxide pigment and others. The composition is applied by brush, bulk, spray.

The disadvantages of the compositions are relatively low resistance, i.e. cracking of the coating when the temperature changes both in positive and in negative direction over 25°and, consequently, loss of the protective properties of the coating during thermal cycles. The latter does not guarantee long-term operation of such coatings on structures used in regions with moderate and severe climatic conditions.

The prototype of the claimed invention is a composition for anti-corrosion coatings (EN 2215763, published. 10.11.2003), comprising a film-forming copolymer of triptoreline with vinylidenefluoride f-32L, organic solvent - CME is ü acetone, butyl acetate, toluene and ethyl acetate and aluminum powder, which increases the adhesion of the coating to the steel. The composition is applied to clean, dry surface by brush, roller, pneumatic spray and loading.

The disadvantages are - sophisticated technology of application of the coating, the necessity of sintering at elevated temperatures, that is not always possible in the coating on the real objects. In addition, the coating has a high propensity for cracking, which is unacceptable when it is used under conditions of a temperature difference.

The invention achieves the technical result consists in:

- ensuring the corrosion resistance of the coating in the range of operating temperatures ±50°C

- ensuring the protective properties of the coating when the surface treatment with water vapor under pressure to 6 bar and at a temperature of 150°C.

This technical result is achieved as follows.

Composition for heat-resistant corrosion-resistant coating includes the following components at a ratio,%:

forprimary polyurethane-based diisocyanate and diethylene glycol - 55%-35%,

polytrifluorochloroethylene - 35-55%,

aluminum powder - 5-10%,

at the same time the dispersion of the particles of the aluminum powder is not more than 20 μm.

Forprimary poly is retin based toluylenediisocyanate and diethylene glycol characterized by a relatively high chemical resistance, good adhesion (no less than 1 point), non-porosity and necessary as the binder component of the coating. When the concentration of this component is less than 35% of the coating becomes porous. In addition, it is found experimentally that when the concentration of the coating becomes-low-tech when applied on the surface of steel products. At concentrations of more than 55% of the coating loses its elasticity, which has a negative impact when thermal cycles and causes it to crack.

Component polytrifluorochloroethylene necessary in this composition as an effective plasticizer, giving the coating ductility and extend the temperature range of its high-elastic state. It also gives additional chemical resistance to organic solvents and acids.

At concentrations of more than 55% of the porosity of the coating increases and the coating process is technologically complicated, and at concentrations of less than 35% are not attached to the floor sufficient ductility, and hence the resistance.

Aluminum powder, which is used in the coating composition, is used as a reinforcing substance that increases the mechanical properties of the coating, leading to a better adhesion to the substrate during application of the coating and increases thermal conductivity of the coating. The latter is especially true as when th the shifts, and during the operation of cleaning structures by superheated steam under pressure. When the concentration of this component is less than 5% of the floor will not have sufficient conductivity, and hence the heat resistance. At a concentration of more than 10% of this component will adversely affect the ductility of the coating.

Aluminum powder particle size of more than 20 μm cannot be used in this composition because of the further deterioration of the plastic properties of the coating.

It should be noted that the use of aluminum powder particle size less than 5 microns leads to lower economic efficiency of the coating due to its high cost.

The invention is as follows.

Example 1.

Before applying a corrosion-resistant coating is thoroughly mixed by mechanical composition of the following composition:

forprimary polyurethane-based toluylenediisocyanate and diethylene glycol - 55%,

polytrifluorochloroethylene - 40%,

aluminum powder 5%,

with the dispersion of particles 10 microns.

Put a protective coating on steel (09G2S) plate with the dimensions of 50×30×5 mm simple mechanically with a brush or roller.

The first layer is applied with a thickness of about 50 to 70 microns, stand in the air for 22-24 h to complete the polymerization. Then put the second layer of p is essentially the same thickness with the same shutter speed. After application of the third layer with a thickness of 50-70 microns are air drying for 96 hours

Tests on the steaming is carried out in shoprite, placing the sample at a distance of 3 cm from the exit of the jet of superheated (T˜50° (C) steam supply pressure of 6 atmospheres.

Corrosion test samples is carried out in a cell with an aggressive environment, which is immersed in a Dewar vessel with liquid nitrogen and after reaching the set temperature -50°To move in a thermostat with a set temperature +50°C.

Anti-corrosion coating spraying steam under pressure for 24 hours did not crack, did not change the color, it was not detected foci corrosion. When thermal Cycling from -50 to +50°in the following environments: gasoline, ethylene glycol, methanol, natural gas condensate, the claimed coating on the surface of steel plates, remains solid and retains its protective properties after 50 cycles. Cycle time - 1 hour; duration of exposure the same for -50 and +50°C. On the surface of the wafer with a coating not detected cracks, lesions corrosion in the form of brown spots or dots, and a liquid medium is transparent.

Example 2.

Three-layer coating declare the following composition:

forprimary polyurethane-based toluylenediisocyanate and diethylene glycol - 55%,

polycrypt phloretin - 35%,

aluminum powder - 10%,

with the dispersion of particles 10 microns, is applied on the inner surface of the steel (STD) tank according to the method described in example 1. Filled petrol tank cover top lid made from the FTZ. Maintain the system for 4, 5 years on the open ground in the city (Moscow) atmosphere. On the claimed coating no corrosion, the coating remains continuous, and gasoline transparent after the above conditions. Steel cover, which was not coated, rust-eaten almost 30%. On its surface there are ulcerative lesions.

Thus, the inventive coating is heat-resistant and protects the steel samples and products at negative and positive temperatures from corrosion in atmospheric conditions and can be recommended for the storage and transportation of petroleum products and organic solvents.

Composition for heat-resistant corrosion-resistant coating, comprising the following components at a ratio,%:

Forprimary polyurethane-based diisocyanate
and diethylene glycol55-35
Polytrifluorochloroethylene35-55
Aluminum powder 5-10

at the same time the dispersion of the particles of the aluminum powder is not more than 20 μm.



 

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2 cl, 1 tbl, 8 ex

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2 tbl, 6 ex

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