Composite material for coating

FIELD: chemistry.

SUBSTANCE: invention concerns composite material for surface coating for units and parts of aggregates, machines, devices requiring corrosion protection and operating for long time in high-temperature (up to 500°C) flow of natural gas combustion products, represented mainly by water and carbon dioxide (CO2), e.g. for gas turbine elements. Composite material includes the following components at indicated ratio, in wt %: 53.6-68.4 of aluminium powder filler and 46.4-31.6 of binder. Liquid glass with 1.40-1.45 g/cm3 density and 2.85-3.05 modulus or its aqueous solution with 1.12-1.18 g/cm3 density and 2.85-3.05 modulus is used as binder.

EFFECT: enhanced corrosion and adhesion resistance of coating operated in conditions of cyclic high-temperature load up to 500°C.

5 tbl, 4 ex, 1 dwg

 

The invention relates to apparatus, machines and mechanisms, requiring protection against corrosion of the surfaces of components and parts, long operating in high temperature up to 500°C flow of combustion products of natural gas, consisting primarily of water and carbon dioxide (CO2), for example, elements of the gas turbine.

Known silicate paint containing alkali metal silicate and zinc dust, used for coatings, in particular, to enhance their protective properties and cuts drying time (As the USSR №338109, IPC C09D

1/02, BI No. 13, 1984) is similar.

The disadvantage of this paint is that due to the presence of zinc in the inventive cover its operating temperature will not exceed the melting point of zinc, which is 400°C.

A known structure of a composite material to produce a protective coating containing liquid sodium glass with a modulus of 4.0-4.5 and a density of 1.18-1.19 g/cm3the enriched kaolin for ceramic products, talc powder and aluminum powder (patent RF №2066336, MPK C09D 1/02 published 1996.09.10.) the prototype.

A disadvantage of the known solutions is that the composite material is used for applying protective layers, operated at ambient temperature, and is not suitable for use in the condition is the beautiful high temperatures. This is due to the fact that the material is not enough aluminum powder, resulting coated will be characterized by a low value of coefficient of linear thermal expansion (cltr) compared to cltr structural steel, and will be peeling it from the substrate during cyclic temperature loading and cooling.

The technical result, which is aimed by the invention is the creation of a composite material, the coating of which is operable at temperatures up to 500°C with high adhesion and corrosion resistance when the operation of machinery and equipment requiring protection against corrosion of the surfaces of components and parts, long operated in the flow of products, consisting primarily of water and/or carbon dioxide (CO2).

This technical result is achieved in that the composite material contains aluminum powder as a filler and as a binder potassium or sodium silicate density of 1.40-1.45 g/ cm3and module 2,85-3,05 or its aqueous solution with a density of 1.12-1.18 g/cm3and module 2,85-3,05 the following ratio of components (wt.%):

aluminum powder 53,6-68,4
binder46,4 of 31.6.

In the composite material can be used aluminum powder, spherical form with a specific surface area of 0.50 to 0.65 m2/g and/or with a specific surface area of 0.34-0.38 m2/year

Composite material is suitable for application, for example, to drive a gas turbine.

The applicant experimental investigations were carried out, from which it follows that the known protective coating disks arranged on the basis of sour aluminophosphate or alumacraft binder and dispersed aluminum, representing the fine particles of lamellar form (powder) or round shape particles with a specific surface area of 0.34-0.38 m2/g (average particle size of 2.7 μm, the maximum of 15.3 μm), are not compatible with carbon steel and low-alloy steels, aluminum, zinc, which excludes the possibility of their use as a binder of the protective coating for such steels.

The applicant proposes a solution which consists in using as a binder composite material liquid glass - water-soluble silicates of alkali metals (potassium or sodium) according to GOST 13078.

The alkali metal silicates are alkaline reaction, and therefore the film of them protect the surface of metals from corrosion. Introduction the s film of filler in the form of aluminum (CU-5-226-82) strengthen protective effect (protective effect).

The ability of liquid glass to act as a foaming agent due to polycondensation processes taking place in it in the presence of CO2or other agents, including temperature, leading to the formation of three-dimensional polymers. Polymers do not dissolve in water, have high mechanical strength, good adhesion to materials.

Polymerization of silicates of alkali metals in carbon dioxide environment is important as a binder of the protective material, for example, elements of gas turbine disks and so on) because the coating on them that will improve their properties with the product due to the high temperature and the presence of CO2in a gas environment.

The inventive composite coating of weather - and heat-resistant, resistant to UV and ozone, have high air and vapor permeability. This means that the coating is porous, and the porosity end-to-end, i.e. the coatings are slight adhesion of dust and dirt, high flame-retardant properties and are environmentally friendly.

The coating may also find application in other fields, for example, for painting inside and outside of premises in the building and restoration.

Coating, pigmented aluminum powder (provide a protective effect, have its corrosion is Tami and can be applied for the protection of the underwater part of the hull of vessels, pipes hot and cold water supply, the internal surfaces of tanks for the storage of drinking water, because aluminum with a melting point of 600°C is quite meets the requirements not only as a pigment, and the only filler that is necessary to ensure high values of coefficient of linear thermal expansion (cltr) coating, comparable with the value cltr for structural steel (substrate), the condition under which the coating is able to stay on the steel substrate when heated to a high temperature and cooling.

The technology of manufacture of the inventive composite material for coating is simple hashing taken in the present limits of liquid glass and aluminum powder. Mixing can be accomplished, for example, a glass or plastic container with lid, spatula and by the shaking method.

To provide a good protective ability of the coating composition is applied to the surface of the part, for example, a soft brush type "Protein" three consecutive layers with drying (curing) of each layer at 100; 200 and 300°C for 3 hours at a speed of temperature rise of 1°C/min

The inventive composite material may be deposited on the surface by brush, trowel or spray application method, and optimally prepare it directly predetremined, using either liquid glass with a density of 1.40-1.45 g/cm3and module 2,85-3,05 or diluting the original liquid glass with water to a density of 1.12-1.18 g/cm3and typing in the inventive mass ratio of the dry portion (filler).

If the binder is applied in a quantity less of 31.6 wt.%, as if more of 46.4 wt.%, the composition is almost impossible to put on the metal surface.

If the filler is less of 53.6 wt.%, - the composition is very dense and poorly with defects is applied to the surface of the product, and if more 68,4 wt.%, each layer of the coating is very thick and therefore fragile with poor strength characteristics.

The best technical result is achieved in the case of spherical aluminum powder form with a specific surface area of 0.50 to 0.65 m2/g and/or with a specific surface area of 0.34-0.38 m2/year

Examples of specific performance

Example 1.

Composite materials only with mineral fillers; only with aluminum and a mixture of mineral fillers with aluminum.

1. Binder is an aqueous solution of liquid sodium glass with a density of 1.15 g/cm3.

Filler only aluminum 0.15 m2/year

An aqueous solution of the liquid article is Klah 36,38 wt.%
Aluminum ASD-063,62 wt.%

2. Only on mineral fillers. Composition, wt.%:

Liquid glass21,69
Water28,31
Alumina10,0
Marshalled10,0
Talc30,0

3. In a lot version 2 introduced the aluminum with a specific surface area of 0.13 m2/g - 10,78%. The resulting composition, wt.%:

Glass17,16
Waterof 22.44
The mixture of powders49,62
ASD-010,78

The drawing shows the spread of rust on a steel plate coated with the coating according to options 1, 2 and 3 after 120-hour soaking in water.

Coatings are deposited using known compositions according to options 2 and 3, completely or almost completely rusted through, i.e. known what's compositions do not provide corrosion resistance in the aquatic environment. The elements of the surface coated with the inventive composition is aluminum and liquid glass is not subjected to corrosion, the area of the plate between them is also not subjected to corrosion, i.e. provided with corrosion resistance in the aquatic environment.

According to the results of the experiment, the preference should be given to coating with a filler based on aluminium, deposited in a ratio in accordance with the invention.

Example 2.

1. Composite materials on liquid glass with a density of 1.42 g/cm3and its aqueous solution with a density of 1.15 g/cm3. The filler is a mixture of fractions of spherical aluminum with a specific surface area S=0,50-0,65; 0,34-0.38 m2/year

Composition:

On the basis of an aqueous solution of liquid glass, table 1.

The liquid suspension well put an even layer squirrel brush, suitable for coating by sputtering technique. As the experiments showed, to produce coatings resistant to water, requires the application of three layers. Test results the resulting coating water-resistant, after 5-day exposure to water rust on the product no, resistant to shock loads. After heavy blows with a hammer on the floor cracking, chipping, delamination no, the coating remains stable.

1.2 Liquid glass.

Soft pasta well put Beli is lay a steel brush on the prepared surface in a thick layer and layers. Coated razdolina area due to swelling around the edges of brush strokes.

The resulting coating is firmly held on the substrate, resistant to severe shock loads (with the powerful blows of the hammer detachment, chips and no cracks). When the blows of the hammer on the floor sound like when hitting the metal. Water - after a 16-day exposure state changes covering is missing.

3. Composite materials on the basis of single and double factional spherical aluminum.

The compositions in table 3.

Table 3
Componentswt.%
Sodium glass
liquid. Solution
33,133.33
glass, density
R=1,15 g/cm3
SID=0.35 m2/g40,15-
SID=0,54 m2/g26,7566,67

In nanomemory better paint on the basis of duhra the traditional spherical aluminum but the surface is rough, odnovremenno smooth. In bonding strength to the substrate, resistance to shock loads, regardless of the dispersion of aluminum powder coatings behave approximately the same.

4. Paints based solutions glass with different density

In table 4, the inks are arranged in order to provide approximately the same aluminum content.

Table 4
ComponentsThe density of the solution, g/cm3
1,121,151,18
Original glass, R=1,43g/cm3p19,40
15,6317,15
Water28,2322,1118,83
Aluminum with SID=0,5m2/g 61,77
56,1460,74

Weight tested for structural steels drives the CCD.

The density of glass 1,12.

Well put a soft brush for longitudinal and transverse movement with the formation of nearly uniform height of the layer.

Layer firmly bonded to the surface, with strong blows with a hammer on one layer and the back segment of delamination and cracking not.

The density of the glass to 1.15. Drop with the spatula does not flow. Apply with soft brush, but equal layer is not obtained, quickly dries on the brush, for this reason is not satisfactory, not suitable for work.

Applied by trowel layer firmly bonded to the surface, with strong blows with a hammer on one layer and the back segment of delamination and cracking not.

The density of the glass of 1.18. In the same way as the previous one, more pronounced. For brush application is not suitable.

Applied by trowel layer firmly bonded to the surface, with strong blows with a hammer on one layer and the back segment of delamination and cracking not.

All coatings are water resistant (after 40 days exposure to water changes on the surface there) and have good adhesion, i.e. the claimed technical result, dostigao is expected.

Comparative analysis of examples of specific performance in terms of ensuring corrosion and adhesion resistance of the surfaces of the parts operating in the water, and their strength characteristics are given in table. 5.

Table 5
№ p/pStructuresTime to surface oxidation (hour)Adhesion according to GOST 15140-78 (point)
ISO 2409-72
Resistance to shock (GOST 4765-73) kg×cm
1.ExampleNot less than 120 hours1,050
No. 1 item 1
2.ExampleNo more than 60 hours042
No. 1 item 2
3.ExampleNot less than 390 hours1,053
No. 2 item 1.2
4.ExampleNot less than 9602,354
No. 4 (ς=1,15 g/cm3)

1. Composite material for coatings containing aluminum powder as a filler and liquid glass as a binder, wherein the binder contains a water glass with a density of 1.40-1.45 g/cm3and module 2,85-3,05 or its aqueous solution with a density of 1.12-1.18 g/cm3and module 2,85-3,05 in the following ratio, wt.%:

aluminum powder53,6-68,4
binder46,4 of 31.6

2. Composite material according to claim 1, characterized in that the aluminum powder, spherical form with a specific surface area of 0.50 to 0.65 m2/g and/or with a specific surface area of 0.34-0.38 m2/year

3. Composite material according to claim 1, characterized in that is used an aqueous solution of potassium or sodium water glass or potassium or sodium water glass.



 

Same patents:

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1 tbl, 5 ex

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1 tbl

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3 tbl

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1 tbl, 5 ex

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1 tbl

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3 cl, 5 ex

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EFFECT: enhanced fireproofing capacity and excluded harmful emissions on heating.

2 cl, 2 tbl

FIELD: chemical industry; printing industry; other industries; methods of production of the composition of the paint including the optically changeable pigments.

SUBSTANCE: the invention may be used in production of the optically changeable pigments. The optically changeable pigment includes the stratified set composed of the different materials, in which, at least, one of the layers represents the reflecting layer and, at least, one of the other layers represents the dielectric layer. At least, one of the surfaces of the indicated layers is subjected to the chemical action. The indicated materials also include, at least, one of the layers, which represents the semitransparent metallic layer made out of chromium and also one or more metals and-or their inorganic compounds. At that the metal and-or its inorganic compound are subject to corrosion. The subjected to the chemical action surface of the reflecting and dielectric layer along the edge of the layering block of the edge structure of the pigment is coated with the passivating agent, which is selected from the group consisting of the organic esters and the fluorinated organic esters of the phosphoric acid, having the following structural formula: (Rf-CH2-CH2-O)xP(O)(OH)y, where Rf=F-(CF2-CF2)z, х=1 or 2, у=2 or 1, х+у=3, z=l-7. The composition of the printing paint includes the binding system, water and the optically changeable pigment. The invention allows to diminish oxidation of the metallic layers and dissolution of the dielectric layers of the optically changeable pigment and to use it in the compositions of the printing paint.

EFFECT: the invention allows to diminish oxidation of the metallic layers and dissolution of the dielectric layers of the optically changeable pigment and to use it in the compositions of the printing paint.

22 cl, 7 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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