Composition for heat-protective cover

FIELD: special compositions.

SUBSTANCE: invention relates to compositions used in preparing heat-protective covers based on silicon-containing ceramic hollow microspheres and able to withstand strong temperature drops. Composition for preparing heat-protective cover comprising hollow ceramic microspheres as a filling agent, a polymeric binding agent, technological additive and water involves hollow ceramic microspheres of specific mass 450-750 kg/m3, hardness value by Mohs scale 5.0-6.0 as a filling agent and in the following distribution of particles by sizes, wt.-%: basis diameter 250-350 mcm, 30-62; diameter 5-10 mcm, 15.0-20.0; diameter 10-30 mcm, 5.0-30.0; diameter 30-50 mcm, 5.0-30.0; diameter 60-100 mcm, 8.0-10.0; diameter 100-250 mcm, 5.0-10.0; as a polymeric binding agent the composition comprises latex chosen from group involving: modified acryl acetate latex, 33-38% latex of copolymer of butadiene, acrylonitrile and methacrylic acid, copolymer of styrene and n-butyl acrylate in the ratio 1:1 by mass; as a technological additive the composition comprises a froth breaker chosen from group comprising: silicon froth breakers, tributyl phosphate, polyester derivatives of fatty acids in the following ratio of components, wt.-%: abovementioned microspheres, 18-32; abovementioned froth breaker, 0.01-1.0; abovementioned binding agent, 8.0-12.0, and water - up to 100. Invention provides expanding assortment of compositions for preparing heat-protective covers, enhancing heat-protecting, heat-physical indices of cover with high uniformity and cohesion strength of cover with a basis, expanding region of working temperature from -60°C to +260°C. Invention can be used in filed of building, machine engineering, aviation, railway transport wherein surfaces require conferring heat-protective properties in exploitation of covers under rigid temperature conditions.

EFFECT: improved and valuable technical properties of composition.

2 tbl

 

The invention relates to compositions for obtaining a heat-shielding coatings based on silicon-containing ceramic hollow microspheres, withstanding sudden temperature drop and can be used in the construction, engineering, aviation, space, railway and other industries.

Known composition to obtain a heat-resistant coating comprising components in the following sootnoshenie, in wt.%: siloxane rubber 30-60; glass microspheres 40-70 and components of the fire retardant composition, in wt.%: siloxane rubber 20,0-79,5; glass microspheres of 20.0-60.0 sec; boron nitride of 0.5 to 20.0 (EN 2039070 C1, 09.07.1995).

Both compositions are used to produce coatings with heat-and-flame-retardant properties. thermal conductivity of the coating to 0.23 W/m°C, the adhesion strength of 5 kg/cm2. Fireproof coating imparts the contents in the structure of boron nitride, however, its use increases the cost of the coating composition, in addition, the boron nitride begins to rapidly oxidized in a dry oxygen at 700-800°With that fire quickly destroys the flame-retardant layer (Gwisoon // acquisition and analysis methods nitrides, Kiev, Naukova Dumka, 1978, s).

Known composition to obtain a heat-resistant coating containing hard polymer, polymer additive, an acid curing agent, glass microsphere water. As a hard polymer is used urea-formaldehyde kfj(M), as well as polymer additives synthetic latex SCS-65 SE, in the following ratio of components, parts by weight of the resin 215,0; latex 1120,0; borosilicate microspheres with a diameter of 40-50 μm of 800.0; acid compound of 7.0, water 75,0 (EN 2220988 C2, 10.01.2004).

A disadvantage of known composition to obtain a heat-resistant coating is sufficiently high conductivity of the coating, which is 0,034-0.038 W/(m·°C), low temperature (not higher than 225° (C) and short time of survival of the composition, which is only 8-10 hours.

Known composition to obtain a heat-resistant coating in the form of a thermo-protective paint, which contains as filler evacuated (hollow) ceramic or refractory microspheres density of 300-400 kg/m3with the following mass distribution of particle size, wt.%: base diameter (30-60 μm) 45-55; diameter (3-10 μm) 15-17; diameter (11-20 µm) 8-10; diameter (21-30 ám) 6-8; diameter (61-70 μm) 9-11; diameter (71-80 μm) 4-6; diameter (91-100 μm) 2-4, the binder contains a resin selected from the group comprising: silicon, polyetheramine, acrylic dispersions, as an additive - reflector - aluminum powder in the following ratio of components, wt.%: the above microspheres 5-70; the pigment is 0.1 to 0.6; reflector - aluminium powder 2,0-5,0; the above binder 30-35 (EN 2245350 C1, 27.01.2005).

Heat-shielding coating obtained by applying a known composition has sufficiently high adhesion to the surface to be protected, homogeneous in composition, but has poor resistance to high temperatures (the operating temperature of the coating does not exceed 250° (C) lack of high thermal and physical characteristics of the coating (thermal conductivity, teplocomplete and heat transfer).

The specified technical solution is selected as the closest equivalent.

The technical result of the invention is the expansion of the range of compositions for obtaining heat-shielding coatings, increase heat and thermophysical characteristics of the coating (reducing its thermal conductivity, teplocomplete and heat transfer), high uniformity and adhesion of the coating to the base, the expansion of operating temperatures from minus 60 to plus 260°C.

The technical result is achieved by the fact that the composition to obtain a heat-resistant coating contains a hollow ceramic microspheres as filler, with a unit weight of 450-750 kg/m3, Mohs hardness of 5.0-6.0, with the following particle distribution of the microspheres in size, wt.%:

Base diameter250-350 mcm30-70
Diameter5-10 microns15,0-20
Diameter10-30 microns5,0-30
Diameter30-50 microns5,0-30
Diameter60-100 microns8,0-10
Diameter100-250 microns5,0-10

as it contains a polymeric binder aqueous solution of a latex selected from the group comprising: a modified greeceitaly latex, 33-38%latex of copolymer of butadiene, Acrylonitrile and methacrylic acid, copolymer of styrene and n-butyl acrylate in a ratio of 1:1 by weight, and technological additive as a defoamer selected from the group comprising: silicon defoamers, tributyl phosphate, polyester derivatives of fatty acids, in the following ratio of components, wt.%:

The above microspheres18-32
The above antifoam0,01-1,0
The above binder8,0-12,0
Waterto 100

In the proposed composition of the filler used hollow ceramic microspheres from fly ash of thermal power plants in the claimed limit of the ratios and dispersion. The choice of filler conducted on the basis of experimental data, showing its optimal content sufficient to provide the desired viscosity of the composition, density, and strength of the finished coating.

Due to the shape and particle size distribution of the particles, microspheres as bulk material, have a high fluidity, which provides a good end of the microspheres from the hopper into the mixer and the formation of a homogeneous composition.

Areas provide a minimum ratio of surface area to their volume, but due to the dispersed distribution of particles, the most compact laying in the floor. The coefficient of laying - 85-95%. The particle shape of the microspheres and selected distribution of particle dispersion allow you to change the viscosity of the composition depending on its destination, obtaining coatings with high performance.

Hollow particles are microspheres have a shell thickness of the sphere is 10% of the diameter. The composition of the gas phase inside the spheres - CO2- 70%, N2- 30%. The ultimate strength in compression is 150-280 kg/see Microspheres do not lose their properties to temperatures exceeding 980°C. the Temperature of their melting point not lower than 1300°C.

thermal conductivity of the microspheres is 0.08 W/(m·° (C), the density of 450-750 kg/m3the Mohs hardness of 5.0-6.0. Properties and composition of the microspheres presents the table 1.

The choice of polymeric binders: modified acilitator latex (dry basis of the water-dispersion paints, for example, VD-VA-123), or 33-38%latex of copolymer of butadiene, Acrylonitrile and methacrylic acid, or a copolymer of styrene and n-butyl acrylate in a 1:1 ratio by weight (base inks BASF "DL-424" and "ACRONAL 290 D"), proved good wettability of their aqueous solutions with the surface of the ceramic microspheres, resulting in obtaining a uniform distribution of particles in the working composition and high resilience.

For defoaming composition in the process of its preparation is administered as defoamers domestic (silicone, TBP - tributyl phosphate, FOAMASTER 8034 FA)and imported (for example, Lumiten EL - polyester derived fatty acids). As a rule, add enough in the composition is not more than 1.0 wt.%.

Silicone defoamers are efficiency, low toxicity, fire-hazardous, nelituji. The brand used defoamers: Cat®-465 - universal defoamer, Penta®-463 (grades a, B, C), Antifoam 139-282. They are all effective in the production of dispersion and latex paints.

Defoamers allow to increase the productive capacity and performance of the apparatus, to prevent the overflow of valuable products, to reduce losses slave is what time to create the necessary conditions.

The method of preparation of the composition is as follows.

The polymer binder is loaded into the mixer, for example turbulent brand SB-43 or vane type 210, add defoamer, stirred to obtain a homogeneous composition, then enter the parts required number of ceramic hollow microspheres with a particle size of 5-350 μm when the distribution of particles specified in the formula, gently mix on a low speed for 0.5-1 hour to obtain a finished composition. The resulting composition is placed in a container and is used for thermal barrier coatings.

The composition is a homogeneous composition, which does not separate during storage and is designed so that its performance will not be changed for at least one year.

The claimed composition is branded "TEPLOS - Top.

Composition without added pigment is a white suspension. The drying time of the layers at a temperature of 20°not more than 24 hours.

Appearance of the coating is smooth, homogeneous. The adhesion of the coating to the steel not less than 1.0 MPa.

"TEPLOS - Top" can be applied to the surface of metal, plastic, glass, concrete, brick, plaster and other building materials, and equipment aviation and railway industry, battery, speaker, buzzer is s and ducts during operation of objects coated at temperatures from minus 60° To + 260°C.

The surface on which is applied the composition of the heat of composition, must be dry and clean, free of rust and grease.

The color and appearance of the coatings, the drying time is determined on glass plates measuring 90×120 mm when the thickness of the coating layer of 0.4 mm

Adhesion to steel is determined according to GOST 15140-78.

The inventive composition is applied to the surface in various ways, which are used in paint technology: trowel, brush, roller or spray gun in the form of at least one layer of a thickness of 1-1 .5 mm

The thickness of all the coating layers to the claimed composition does not exceed 7 mm and depends on the nature of the surface. So on the inner surface of dwellings enough to put just one layer of a thickness not exceeding 1.5 mm

On the metal surface of the pipe hot water passing under the earth, it is necessary to put the maximum number of layers. So when the total thickness of the coating 6 mm on the steel pipe surface with a temperature of 90°C, surface temperature is reduced to 25-30°C.

After application to the surface of the material or product layer or multiple layers, and after drying, the deposited layers, the composition forms a heat-protective coating of ceramic microspheres and polymeric binder, strongly connected with the base and having a high to operate the operating characteristics. After drying contains 60-80 wt.% ceramic microspheres with a diameter from 5 to 350 μm, uniformly distributed in a polymeric binder, which corresponds to the density of filling of 85-95% and provides high properties of the coating that can withstand temperatures ranging from minus 60 to plus 260°when the total thickness of layers 1 to 7 mm

The essence of the method is illustrated by examples, summarized in table 2, which reflects the compositions, the thickness of the layers and their number, nature, and the temperature of the surface on which is applied in the form of layers, the compositions and properties of the resulting coating.

In example 1 on the surface of the masonry, with the surface temperature and the environment plus 7°With, put part 1 in the form of 3 layers (total thickness 4.5 mm), drying which is carried out at a temperature of 20-25°C. properties of the coating are presented in table 2.

In example 2 on the surface of the steel pipe having a temperature of 150°caused by atmospheric conditions (at a temperature of 20-25°C, normal pressure and humidity) 5 layers of composition 2 and dried at a temperature of pipe surface. After applying thermal barrier coatings temperature decreased from 150 to 50°C.

The decrease in the surface temperature of steel pipe with 90 to 30°With those obtained by use of the composition 3.

From the tabular data, after which the duty to regulate, that the resulting coating has a tensile strength of 3.0-3.5 MPa, thermal conductivity of 0,001-0,003 W/(m·° (C), the heat exchange 5.5 to 6.5 W/(m·° (C) and heat transfer 2-4 W/(m·°).

"TEPLOS - Top" meets the fire safety requirements set out in NPB 244-97 when testing for flammable basis: group Flammability - GS, GOST 30244-94 (normologiya according to SNiP 21-01-97); group Flammability - 1 according to GOST 30402-96 (inflammable posip 21-01-97).

Thus, the proposed structure allows to obtain coatings with unique thermal properties that may find its extensive use in the construction industry, in mechanical engineering, chemical industry, aviation and rail industries, i.e. where you want to make the surfaces of the heat-and fire-resistant properties, the operation of the coatings in harsh temperature conditions.

Table 1
The physical properties of the microspheresThe composition of the microspheres, %
Size, microns5-350SiO255-65
The density of the material of the walls of the sphere, g/cm32,5Al2O325-33
Bulk density, fuel 30,32-0,37Fe2O31-6
Specific gravity, g/cm30.45-0.75CaO0.2-0.6
The Mohs hardness5-6MgO1-2
Melting point, °1300K2O; Na2O0.2-4; 0.3-2
Surface humidity, %0,3 maximumTiO20,5-1,0

The composition to obtain a heat-resistant coating containing hollow ceramic microspheres as a filler, a polymeric binder, technological additive and water, wherein the filler it contains hollow ceramic microspheres with a specific gravity of 450-750 kg/m3, Mohs hardness of 5.0-6.0, with the following distribution of particle size, wt.%:

The base diameter of 250-350 microns30-62
The diameter of 5-10 microns15,0-20
The diameter of 10-30 microns5,0-30
The diameter of 30-50 μm5,0-30
The diameter of 60-100 microns8,0-10
The diameter of 100-250 microns5,0-10

in ka is este polymeric binder contains latex, selected from the group comprising modified greeceitaly latex, 33-38%latex of copolymer of butadiene, Acrylonitrile and methacrylic acid, copolymer of styrene and n-butyl acrylate in a ratio of 1:1 by weight, as a technological additive composition contains a defoamer selected from the group comprising silicone defoamers, tributyl phosphate, polyester derivatives of fatty acids in the following ratio, wt.%:

The above microspheres18-32
The above antifoam0,01-1,0
The above binder8,0-12,0
Water100



 

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