Paint composition with thermo-, fire-protective properties

FIELD: chemistry.

SUBSTANCE: paint with thermo-, fire-protective properties contains (wt %): binder based on acrylic (co)polymers and/or silicone resins and organosoluble polyurethanes - (20-40), filler in form of a mineral component - (10-30), antipyrene additive - (10-20), modifying additive in form of ceramic and/or glass microspheres with diameter of 20-150 mcm -(10-30) and an organic solvent - the rest. The paint composition additionally contains bentonite powder, intercalated with cobalt Co2+ ions and/or cerium Ce3+ ions in amount of 3-7 wt %.

EFFECT: invention increases stability of the formed protective paint coating to thermal-oxidative reactions, improves environmental safety, fire-resistance of the protective coating and endows said coating with bactericidal properties.

7 cl, 2 dwg, 1 tbl

 

The technical field

The invention relates to the production of paints and varnishes, in particular inks heat-, flame-retardant properties in relation to the surfaces of various articles made of such structural materials, such as metal, concrete, wood, etc. are used, including in the production of products, equipment and construction of facilities for medical purposes.

The task of ensuring the protection of the surfaces of structural products is the main factor in the improvement of their reliability.

When creating a protective paints, as ORGANOARSENIC and water in their composition, use modifier and processing AIDS to improve various performance characteristics of the coatings, including their thermal, flame retardant properties.

Prior art

Known paint containing film-forming on the basis of chlorinated polymethylphenylsiloxane with a chlorine content of 2.3-8 wt.%, the filler is mica "Muscovite", titanium dioxide and aerosol, and an organic solvent is toluene (see RF patent №2041906, publ., 20.08.1995 year). The resulting coating provides a relatively high thermal (up to 430°C) and anti-corrosion properties.

However, the use of the coating composition of toxic components - chlorononane is about polymethylphenylsiloxane (product of chlorination industrial resin K-40 molecular chlorine) and toluene - limits the technological possibilities of use coverage and especially to protect the surfaces of equipment and medical products.

In the application RU # 93052300, 20.07.1996 proposed composition of the paint, forming a heat protective coating for pipelines. The composition contains glass microspheres with a diameter of 200-300 μm, polyisobutylene plasticizer And a-200, a hardener and a polyethylenepolyamine, epoxy binder and a modified epoxy binder ED-20. Obtained in this technical solution, the coating forms a composition with hollow microspheres filled with the best heat insulator is air, which gives a protective coating insulating properties.

However, this composition does not have flame retardant and antibacterial properties, which limits the technological possibilities of using the composition for formation of protective coatings for equipment and premises for medical purposes.

Known technical solution according to the patent RU No. 2382803, publ. 27.02.2010, which offered a paint composition with a thermal flame-retardant properties.

This solution is chosen as the closest analogue of the present invention.

Proposed patent paint composition with a thermal flame-retardant properties contains a polymeric binder based on acrylic (co)polymers and/or PU glue is organicheskikh resins and organic polyurethanes, the filler in the form of mineral components, a flame retardant additive, modifier additive on the basis of ceramic and/or glass microspheres with a diameter of 20-150 μm, and an organic solvent.

In this technical solution:

filler selected from the group of mineral components: micropollutant, kaolin, marble, mica and/or inert barite fillers;

a flame retardant additive selected from the group of phosphorus compounds, hydroxides of aluminum or magnesium, zinc borate, melamine and pentaerythritol.

The proposed structure of the paint forms a thermo-, fire-retardant coating on the surfaces of structural products used in various industries.

However, this paint composition has such disadvantages as:

reduction of thermal properties during operation of the products due to thermophotovoltaic degradation of the polymer matrix;

low environmental safety due to increased outgassing of volatile toxic organic compounds in thermophotovoltaic degradation of the polymer matrix and especially in emergency situations, for example in case of fire;

low efficiency of bactericidal properties of protective coatings.

These circumstances limit the technological possibilities of the use the of the paint for the formation of thermo-, fire-retardant coatings to surfaces and equipment in the premises for medical purposes.

The essence of the invention.

The technical result of the present invention is to expand the technological capabilities of paint by improving thermal, flame retardant properties of the formed coating, giving it a bactericidal properties while improving environmental parameters (sanitary-hygienic properties).

For the technical solution proposed composition of the paint with heat, fire retardant properties, containing a polymeric binder based on acrylic (co)polymers and/or silicone resins and organic polyurethane filler in the form of mineral components, a flame retardant additive, modifier additive on the basis of ceramic and/or glass microspheres with a diameter of 20-150 μm, and an organic solvent in the paint put the powder of bentonite intercalated by ions of cobalt Co2+or ions of cerium CE3+or mix named powders at a ratio of them, as 1÷1 (parts), and the composition has the following ratio of components, wt.%:

polymer binder20-40
filler10-30,
a flame retardant additive10-20
modifying additive10-30
powder bentonite3,0-7,0
organic solventthe rest of it.

In the invention using acrylic copolymers and/or silicone resin at a ratio of them to organic polyurethanes, as 1÷(0,2-1,5) (vesc).

In the invention, the powder of bentonite intercalated by ions of cobalt Co2+obtained by modification of 0.5-2.5% aqueous solution of nitrate salts of cobalt- (NO3)2·6N2O prefabricated bentonite obtained after enrichment cations sodium (Na+) when processing 3-10% aqueous solution of sodium chloride, followed by purification of chlorine anions, and after intercalation bentonite cleaned from salts of sodium and then crushed bentonite, with one part of bentonite upon receipt of prefabricated bentonite enriched with sodium ions, and on one part of the semi-finished product upon receipt of the powder of bentonite intercalated by ions of cobalt, used (10-40) (parts) of solutions of the corresponding salts.

In the invention, the powder of bentonite intercalated by ions of cerium CE3+obtained when modificati is 0.5 to 2.5% aqueous solution of nitric acid salt of cerium CE(NO 3)3·6N2O prefabricated bentonite obtained after enrichment cations of Na+when processing 3-10% aqueous solution of sodium chloride, followed by purification of chlorine anions, and after intercalation bentonite cleaned from salts of sodium and then crushed bentonite, with one part of bentonite upon receipt of prefabricated bentonite enriched with sodium ions, and on one part of the semi-finished product upon receipt of the powder of bentonite intercalated by ions of cerium use (10-40) (parts) of solutions of the corresponding salts.

In the invention, the powder of bentonite and crushed to particle size of not less than 100 nm.

In the invention as mineral filler used micropollutant, kaolin, marble chips, mica and/or inert barite fillers.

In the invention the composition further comprises a pigment, for example, on the basis of titanium dioxide in the amount of 2-4 wt.% on the composition of the paint.

When implementing the present invention are expanding technological possibilities of applying paint to obtain heat, flame retardants in buildings, ventilation systems, water supply and other equipment, operating in orphanages, hospitals, food industry, and also in explosive and fire hazard areas, as the presence of inof the paint mineral component-based bentonite powder, intercalibrating cobalt ions With2+or ions of cerium CE3+or a mixture of the mentioned powders helps:

to improve the stability of the formed protective coating to thermal-oxidative reactions due to the inhibitory activity of cerium ions and cobalt to thermal-oxidative processes that occur in the polymer matrix when coating;

improving the environmental security formed a protective coating due to the reduction of outgassing of volatile toxic organic compounds in thermophotovoltaic processes in the polymer matrix and in emergencies, such as fire;

giving the formed protective coating bactericidal properties.

In the analysis of the prior art are not identified technical solutions with a set of features of the present invention described above and provides the result.

The analysis of the prior art demonstrates compliance with the proposed technical solution criteria invention of "novelty", "inventive step".

The present invention can be industrially realized by using known manufacturing processes, equipment and materials intended for the manufacture of paint and varnish compositions.

The implementation of the invention

The invention is illustrated:

table 1, which presents examples of the compositions of paints;

Fig.1 and Fig.2, which shows the total ion chromatogram current volatile organic compounds emitted, respectively, from protective coatings (a)formed by the compositions according to examples 6 and 7 (control inks on patent RU No. 2382803), and protective coatings (b)formed by the compositions of examples 1-5 (inks according to the invention).

When implementing the present invention using the following components.

1. Bentonite powder intercalated by ions of cerium CE3+. This product is obtained by modification of 0.5-2.5% aqueous solution of nitric acid salt of cerium Ce(NO3)3·6N2O prefabricated bentonite (montmorillonite), obtained after enrichment cations Na+when processing 3-10% aqueous solution of sodium chloride, followed by purification from the anions of chlorine.

After intercalation bentonite cleaned from salts of sodium and then crushed bentonite, preferably to a particle size of not less than 100 nm. When choosing salt CE(NO3)3·6N2O came from the fact that the cerium (metal of variable valence) interacts with oxygen to produce cerium dioxide (CEO2), which is an antioxidant, which is characterized by inactivating and the locking effect on the peroxide, hydroperoxide radicals generated during oxidative processes in polymers. This metal refers to a biologically compatible material and is used in medicine, for example, prosthetics, dentistry.

When implementing the present invention in the process of intercalation of prefabricated bentonite obtained after enrichment cations Na+used a 1.0% aqueous solution of cerium nitrate CE(NO3)C·6N2O. Received after intercalation, cleaning and grinding powder of bentonite contains cerium in an amount of not more than 0.5 wt.%.

2. Bentonite powder intercalated by ions of cobalt Co2+.

This product is obtained by modification of 0.5-2.5% aqueous solution of nitrate salts of cobalt - (NO3)2·6H2O prefabricated bentonite obtained after enrichment cations of Na+when processing 3-10% aqueous solution of sodium chloride, followed by purification of chlorine anions. After intercalation bentonite cleaned from salts of sodium and then crushed bentonite.

When implementing the present invention in the process of intercalation of prefabricated bentonite obtained after enrichment cations Na+used a 2.0% aqueous solution of cobalt nitrate Co(NO3)2·6N2O.

In layered with whom ructure particles of bentonite cobalt ions With 2+interact with oxygen with the formation of cobalt oxide (COO), which is characterized by inactivating and inhibitory effects on peroxide, hydroperoxide radicals generated during oxidative processes in polymers.

This metal refers to the biologically compatible materials and is widely used in medical practice.

Received after intercalation, cleaning and grinding powder of bentonite contains cobalt in the amount of approximately 0.9 wt.%.

Processes for the production of prefabricated bentonite enriched sodium ion was carried out using 5% aqueous sodium chloride solutions.

Upon receipt of the prefabricated bentonite enriched with cations of sodium, and upon intercalation ions of these metals obtained semi-finished product in one part of bentonite upon receipt of cake mix and one part of the semi-finished product in obtaining powder of bentonite intercalated by ions of cobalt or cerium use (10-40) (parts) of solutions of the corresponding salts.

By reducing or increasing the percentage content of inorganic salts in the solvent (water), flow of aqueous solutions of salts on the processing of bentonite with enrichment of its cations sodium and intercalation of the obtained semi-finished product of bentonite ions of the respective metals:

reduced EF is aktivnosti cation-exchange processes in obtaining powders of bentonite, intercalated cobalt ions With2+or ions of cerium CE3+that reduces the content of these metals in the resulting product, worse bactericidal properties of the ink and the stability of the formed protective coating to thermal-oxidative reactions;

increased expense in obtaining powder of bentonite intercalated by ions of cobalt Co2+or ions of cerium Ce3+.

The invention used ratio:

bentonite:an aqueous solution of sodium chloride, as 1:20;

prefabricated bentonite:an aqueous solution of the corresponding salts of cobalt or cerium as 1:20.

To determine the quantitative content (wt.%) these metals in bentonite powders used titrimetric methods of analysis, the results of which confirm the optimality of the selected parameters to obtain powder of bentonite intercalated by ions of these metals, when given according to the invention the flow of salts.

Received after intercalation bentonite intercalated by ions of cerium or cobalt, after the removal of sodium salts, crushed, preferably to a particle size of not less than 100 nm, which is optimal in terms of their dispersion in the paint and costly part of grinding.

During the grinding bentonite intercalated by ions of cobalt is and Co 2+or ions of cerium CE3+used ultrasonic disperser Sonopuls HD 2070, the firm Bandelin, power - (35-75)W/cm2and frequency (20 to 50) kHz.

To assess the particle size of the bentonite used the microscopy method.

Used to implement the present invention salts of cobalt and cerium most optimal conditions for production of ecologically safe products.

The violation of technological regimes on receipt of bentonite powders, intercalibrating ions of these metals, the reformulation of paint on the quantitative content of powders of bentonite intercalated by ions of cerium CE3+and/or cobalt ions With2+will:

the cost of the processes of their production;

to reduce the environmental safety of the formed protective coatings in terms of deterioration of inactivating and blocking effects of metal ions of cerium and cobalt peroxide, hydroperoxide radicals formed during thermo-oxidative degradation operated coatings;

to the deterioration of the bactericidal properties of protective coatings.

3. The paint according to the invention contains a polymer binder based on acrylic (co)polymers and/or silicone resins and organic-polyurethanes (PU).

In particular, use:

polymethylsiloxane resin, including liquid celexa the new rubbers, polymethylphenyl siloxane resin, polymethylphenylsiloxane rubbers;

polyurethane resin-based polyether and diphenylmethanediisocyanate or toluylene diisocyanate (for example);

acrylic copolymers, for example copolymers of butyl methacrylate or methyl methacrylate with methacrylic acid and possibly butadiene, acrylic dispersions, for example, based on styrene-acrylic copolymer.

4. As the organic solvent used in typical organic solvents which dissolve the above polymeric binder, such as ethyl acetate, butyl acetate, acetone, etc.

5. As the flame retardant additive used compounds from the group of phosphorous compounds, hydroxides of aluminum or magnesium, zinc borate, melamine and pentaerythritol.

6. Used in the paint composition of the mineral filler is selected from the group micropollutant, kaolin, marble, mica and/or inert barite fillers.

Mineral filler can improve the heat resistance, the chemical resistance of the coating, improves the flame retardant properties of the coating.

7. In the paint composition using the modifying additive in the form of a ceramic and/or glass microspheres with a diameter of 20-150 μm, the presence in the composition of the paint gives a protective coating insulating properties, improves the fire is teukie characteristics of the coating and other technological properties of paints.

When used in formulations of paints modifying additives on the basis of ceramic microspheres provide such technological properties of coatings, such as endurance, gloss, etc. and the presence in the compositions of the inks of modifying additives on the basis of glass microspheres leads to a decrease in the density of paint, improving their compatibility with various polymeric binder.

When choosing these modifying additives or a mixture of them, it is recommended to consider the technological properties and the cost of these additives in the manufacture of inks.

Defined according to the invention the size fractions modifying additives, quantitative content in the paint optimally in terms of their dispersion in the polymer matrix, in terms of the cost of their production, to ensure the insulating properties of the resulting layer, as confirmed by the technical solution according to the patent RU No. 2382803.

When implementing the present invention used ceramic and glass microspheres 3M™ (RU), respectively:

ceramic microspheres with a particle size 24-40 microns;

glass microspheres with a particle size of 100 microns.

8. The paint composition according to the invention contains a pigment, preferably titanium dioxide and other technological additives, for example, to provide elasticity is or ink into - liquid paraffins, which are introduced into the formulation in the production process of the paint.

Defined according to the invention the quantitative content of the components in the paint:

a polymeric binder, the flame retardant additive, mineral filler, modifying additives in the form of a ceramic and/or glass microspheres optimally and meet the technological requirements for obtaining paint, having an effective adhesive properties to the surfaces of various materials, effective thermal conductivity, heat resistance, which is confirmed by the technical characteristics of the paint, the composition of which is presented in the patent RU №2382803.

The paint obtained by dispersing the components in the mixer. Possible use for these purposes, an ultrasonic disperser.

The resulting paint is applied on various surfaces using brush or spray gun.

The invention compositions were obtained paint formulation which corresponds to the examples shown in Table 1.

Examples 1-5 - the inks according to the invention. Examples 6 and 7 control the inks in accordance with the patent RU No. 2382803.

The inks according to examples 1-7 were evaluated for fire resistance, environmental safety and bactericidal activity generated through the use of protective coatings.

When determining agnesa itney the effectiveness of the compositions of the inks used method, in accordance with which prototypes - steel plate of size 600×600×5 mm coated with a protective coating (inks according to examples 1-7) was carried out by thermal effect and determined the time from the start of heat exposure until the limiting condition of protective coatings on these samples. The thickness of the protective coatings on the samples was 250 μm.

The limiting condition of protective coatings on the samples was estimated by the time of expansion (exfoliation) of the protective coating and by the time the smoke.

When testing was used testing equipment:

furnace feed system and combustion (used gas burner); devices for installation of the sample, to ensure compliance with its mounting in the furnace; system of measurement and registration of parameters, in particular, stopwatch, thermoelectric transducers (thermocouples to measure the temperature in the fire chamber of the furnace.

In the process of testing found that when the temperature in the furnace time limiting state of expansion (exfoliation) and smoke on the samples with protective coatings formed from compositions according to the invention (examples 1-5), 8-10 min higher than the same parameters in the test samples with a protective coating according to examples 6 and 7 (control).

To increase the possible measurement accuracy when the test was used on two samples for each of the investigated composition of the paint.

These tests show:

about the improvement of the operational characteristics of the paint composition according to the invention in case of fire;

about the improvement of the ecological parameters of protective coatings using paint according to the invention due to the reduction of outgassing of volatile toxic organic compounds in oxidative processes.

Environmental security inks were evaluated for their hygienic properties.

To assess the sanitary-hygienic properties used method thermodesorption gas chromatography / mass spectrometry (GOST R ISO 16000 Air confined space", part 6). With this method, we studied the emission of volatile organic compounds from coatings formed by the compositions of the inks according to examples 1-5 and 6-7 at the testing temperature of from 20 to 50°C.

According to the results of sanitary-hygienic testing established that the introduction of inks such a layered mineral component as bentonite (montmorillonite), intercalated by ions of CE3+and Co2+formed their protective coating (1-2 orders of magnitude) to reduce volatile organic compounds, mainly Monomeric residues, as evidenced by the chromatograms 1 and 2, which are, respectively:

total ion current of volatile organic compounds released from protective coatings (a), educated compositions according to examples 6 and 7 (control formulations of paints);

total ion current of volatile organic compounds released from protective coatings (b)formed by the compositions of examples 1-5 (inks according to the invention).

These findings suggest that the presence of paint layered mineral component with intercalated therein ions of these metals provides the inhibition of the process of destruction of polymer materials, which is accompanied by release of volatile organic compounds.

Evaluation of the bactericidal properties of the paints was carried out on the basis of decodifying method.

Desctiption method of determining the sensitivity of microorganisms (bacteria and fungi) based on the ability of antibacterial agents to diffuse into the nutrient medium from the impregnated compositions paint cardboard (paper) disks.

For the evaluation of bactericidal activity of the compositions of the inks used a dense nutrient medium - tripletail agar (Trypcase-soy agar), as the test microorganisms used strains of bacteria: Staphylococcus aureus; Pseudomonas aeruginosa.

As a diagnostic disks used were standard discs with a diameter of 6 mm from the special filter cardboard (paper). The disks were subjected to a single treatment (impregnation) of the subjects with the composition of paints (Examples 1-7)

Suspension (inoculum) of each test bacterial cultures in sterile physiological solutions were prepared with density (turbidity) of 0.5-0.6 standard Mac-Farland. The suspension contained approximately 1.5 to 2.0×108CFU/ml (colony forming units/ml).

Inoculum (within 15 minutes after preparation) was used for inoculation dense nutrient media in Petri dishes.

Inoculum was applied by pipette to the surface of a nutrient medium in a volume of 1-3 ml and distributed evenly on the surface. Agape Petri dishes were dried at room temperature for 15-20 minutes.

After inoculation on the surface of the medium (with the help of sterile forceps) put the disks treated with test compounds paints. Ensured uniform and intimate contact of the disks with the surface environment.

Directly after application disks in Petri dishes were placed in a thermostat, and incubated at a temperature of 25-35°C for 24 hours

After the end of the incubation was measuring the diameter of zones of growth inhibition of the test organisms (drive around) with an accuracy of 1 mm When the measurement is focused on the zone of complete suppression of visible growth. For the validity of the studies testing the drives with tested recipes paint was repeated three times, was estimated as the average value of the diameter of the zone of growth inhibition.

As a result of researches it is established:

zone of inhibition of visible growth of test microorganisms drives around with the subjects of the inks according to the invention (examples 1-5) correspond to 10-12 mm;

the absence of zones of inhibition around the disks with subjects compositions of the inks according to examples 6-7 (control).

The presence of zones of growth inhibition of the test organisms around the disks with the subjects of the inks according to examples 1-5 showed significant bactericidal effect inherent in the inks according to the invention.

Thus, these studies generally confirm that, when implementing the present invention improves the stability of the formed protective coating to thermal-oxidative reactions due to the inhibitory activity of cerium ions and/or cobalt to thermal-oxidative processes that occur in the polymer matrix when coating, improving the environmental safety of the formed protective coating due to the reduction of outgassing of volatile toxic organic compounds in thermophotovoltaic processes and in emergencies, such as fire, is formed by giving a protective coating bactericidal properties.

Thus, the above studies generally confirm that the implementation of the present invention expand the technological capabilities of p is imeneniya paint to obtain thermo-, fire-retardant coatings to surfaces and equipment in the premises, operating in orphanages, hospitals, food industry enterprises.

TABLE 1
The paint composition with heat-, flame-retardant properties
Examples of inks
Name of the componentThe ratio of the components in the examples, wt.%
1234567
The inks according to the inventionThe control compositions according to the patent No. 2382803
Organic-polymer matrix
Silicone resin (polymethylsiloxane)201125
The copolymer of butyl methacrylate and methacrylic acid2525
The styrene-acrylic copolymer dispersion20
organic polyurethane based on polyether and diphenylmethanediisocyanate111551511105
Filler
Kaolin25202025
Micropollutant 302530
Modifying additive
glass beads with a size of 100 mm103020151020
ceramic microspheres with a particle size 24-40 mcm15
A flame retardant additive
metasilicate calcium102020
Ammonium polyphosphate20 151820
Bentonite powder
Bentonite powder intercalated by ions of cerium (CE3+)45
Bentonite powder intercalated by ions of cobalt (Co2+)55
The mixture of bentonite powders intercalated by ions of cerium and cobalt at a ratio of 1:17
Organic solventThe rest all examples

1. The paint composition with heat-, flame-retardant properties, containing polymeraseshas based on acrylic copolymers and/or silicone resins and organic polyurethanes, the filler in the form of mineral components, a flame retardant additive, modifier additive on the basis of ceramic and/or glass microspheres with a diameter of 20-150 μm, and an organic solvent in the paint put the powder of bentonite intercalated by ions of cobalt Co2+or ions of cerium CE3+or mix named powders at a ratio of them, as 1÷1 (parts), and the composition has the following ratio of components, wt.%:

polymer binder20-40
filler10-30
a flame retardant additive10-20
modifying additive10-30
powder bentonite3,0-7,0
organic solventrest

2. The composition according to claim 1, characterized in that use acrylic copolymers and/or silicone resin at a ratio of them to organic polyurethanes, as 1÷(0,2-1,5) (parts).

3. The composition according to claim 1, characterized in that the additional mineral component-based powder of bentonite intercalated by ions to the of Balta With 2+obtained by modification of 0,5-2,5%aqueous solution of nitric acid salt of cobalt - (NO3)2·6N2O prefabricated bentonite obtained after enrichment cations of Na+when processing 3-10%aqueous solution of sodium chloride, followed by purification of chlorine anions, and after intercalation bentonite cleaned from salts of sodium and then crushed bentonite, with one part of bentonite upon receipt of prefabricated bentonite enriched with sodium ions, and on one part of the semi-finished product upon receipt of the powder of bentonite intercalated by ions of cobalt, used (10-40) parts of the solutions of the corresponding salts.

4. The composition according to claim 1, characterized in that the additional mineral component-based powder of bentonite intercalated by ions of cerium CE3+obtained by modification of 0,5-2,5%aqueous solution of nitric acid salt of cerium CE(NO3)3·6N2O prefabricated bentonite obtained after enrichment cations of Na+when processing 3-10%aqueous solution of sodium chloride, followed by purification of chlorine anions, and after intercalation bentonite cleaned from salts of sodium and then crushed bentonite, with one part of bentonite upon receipt of prefabricated bentonite enriched with sodium ions, and on one part of the floor is brand upon receipt of the powder of bentonite, intercalated by ions of cerium use (10-40) parts of the solutions of the corresponding salts.

5. The composition according to claim 1, characterized in that the powder of bentonite and crushed to particle size of not less than 100 nm.

6. The composition according to claim 1, characterized in that the mineral filler used micropollutant, kaolin, marble chips, mica and/or inert barite fillers.

7. The composition according to claim 1, characterized in that it additionally contains a pigment, for example, on the basis of titanium dioxide in the amount of 2-4 wt.% on the composition of the paint.



 

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FIELD: oil-and-gas production.

SUBSTANCE: propping filler consists of central part and shell made from material different from that of said central part. Note here that said shell is made from sponge material rigidly secured in central part so that total surface area of shell-to-central part joint is smaller than central part surface area. Propping filler consists of more than two granules comprising central part and shell made material different from that of said central part. Note here that said shell is made from sponge material and granules are bonded into chain or mesh by polymer material. Invention is developed in dependent claims.

EFFECT: optimum high strength-to-low density ratio, as well as buoyancy preventing filler premature precipitation.

6 cl, 2 dwg

FIELD: chemistry.

SUBSTANCE: free flowing coated particles, having size ranging from 6 mesh to 200 mesh, where each particles has a substrate and a coating on the substrate. Said coating contains a continuous phase which contains a curable resol phenol-formaldehyde resin, and reactive powdered particles embedded into the continuous phase or adhered to said phase, wherein the powdered particles contain at least one component selected from a group consisting of resol phenol-formaldehyde resin, phenol-formaldehyde novolac resin, ester, an acrylic compound and urethane. The method of producing said particles involves the following steps: mixing a substrate with a liquid coating material from the curable resol phenol-formaldehyde resin at temperature ranging from approximately 10°C to approximately 65°C to form a resin curable coating in form of a continuous phase on the substrate; mixing the reactive powdered particles with the resin-coated substrate to embed said particles into the continuous phase of the resin coating or adhere said particles to the substrate.

EFFECT: possibility of cost-effective production of highly effective particles in industrial conditions.

43 cl, 4 tbl, 5 ex, 10 dwg

FIELD: oil-and-gas production.

SUBSTANCE: proposed fluid to be used in oil fields comprises: 0.001 wt % to 0.5 wt % of surfactant reducing drag and at least one activator of drag reduction selected from the following group: polymer drag reduction activators selected from the group comprising low-molecular water-soluble polymers and copolymers containing at least one aromatic cycle, or their mixes with monomer drag reduction activator. Note here that said fluid allows drag reduction percentage making at least 20%. Proposed method of regulating clay swell in brine-free well shaft comprises: preparing above fluid suspending reduction agent and injecting it into well shaft. Method of processing in-situ in oil filed whereat said suspending reduction agent is prepared, injected into well shaft to reach drag reduction percentage equal to at least 20%. Invention is developed in dependent claims.

EFFECT: improved viscosity and power to suspend solid substances at low surfactant concentrations.

20 cl, 33 ex, 4 tbl, 36 dwg

FIELD: chemistry.

SUBSTANCE: the invention relates to preventing metal corrosion with the use of paint coatings. The invention aims to find high-effective low-hydrolising phosphonate pigments. The result is achieved by the method of producing core anticorrosive pigment by interreacting hydroxyethylidene diphosphonic acid with calcium carbonate in a water medium. The mass ratio of hydroxyethylidene diphosphonic acid to calcium carbonate is 0,5-7,0 : 93,0 - 99,5 respectively. The mass ratio of the said mixture to water is 2 : 1 respectively. The method allows to obtain core phosphonate pigment with the structure comprising a low-hydrolising core and a hydrolising phosphonate shell which provides the effective anticorrosive properties of the pigment.

EFFECT: production of pigment with better anticorrosive properties than calcium hydroxyethylidene diphosphophonate and toxic zinc tetraoxychromate.

2 tbl, 6 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a paint and/or a coating composition including anti-corrosive pigment and comprises an interaction between hydroxyethylidenediphosphonic acid and zinc oxide, the ratio of 0.5-9.0 : 91.0-99.5, respectively, and the mass ratio of the above mixture and water equal to 2:1, respectively.

EFFECT: production of Core phosphonate pigment with the structure comprising a weakly hydrolyzed core and a hydrolyzed phosphonate capsule that provide for potent anticorrosive action.

2 tbl, 8 ex, 1 dwg

FIELD: weapons and ammunition.

SUBSTANCE: invention may be used in machine building, also in other industries, in production of consumer goods and cultural and household goods. The anticorrosion protective coating for a steel case surface in cartridges of small arms contains a zinc-phosphate layer, a polymer layer in the form of a polymer-polymer complex on the basis of a polyorganosiloxane polymer and a butadiene copolymer with styrene, a modifying additive, containing 60-70% solution in the mixture of ethyl glycol acetate and butanol of epoxyaminorubber adduct, modified with melaminoformaldehyde resin K-421 -02, formic acid, epoxide-alkyd resin E-30, distilled water. The invention also relates to the method of applying an anticorrosion protective coating, including serial formation of a zinc-phosphate layer, application of a polymer layer by means of cases treatment in an aqueous solution of the specified polymer-polymer complex, curing, at the same time cases are treated at one stage in a screw apparatus without intermediate drying after wet-on-wet phosphatising or at two stages at separate equipment with intermediate drying after phosphatising, at the same time when the process is carried out at one or two stages to remove an excessive layer of polymer composition and moisture, to reduce contamination of equipment, separation operation is carried out with modification of polymer composition curing modes.

EFFECT: increased stability of working solution of polymer composition with a modifying additive during operation and storage, achievement of compatibility of a polymer base with a modifying additive, reduced upper limit of temperature during drying operation, reduced power inputs during technological process, reduced economic costs, development of a protective coating, with improved physical-mechanical parameters.

5 cl, 1 tbl

FIELD: construction.

SUBSTANCE: primer contains alkyd film binder, colourant, drying agent, addition, solvent; in addition, it contains microtalc - magnesium silicate as filler, alkyd varnish as alkyd film binder with addition of lignin powder modifying agent of rust, colourant - zinc oxide as addition and addition for reduction of surface tension of film binder - polyethyl siloxane liquid, fatty acid drying agent containing manganese and plumbum, calcium carbonate, and white spirit as solvent.

EFFECT: when using the proposed composition it can be obtained anticorrosion primer with high process properties at simultaneous increased protection duration of coatings; adhesion strength is increased; the drying time is reduced and impact strength is increased.

2 tbl, 3 ex

FIELD: metallurgy.

SUBSTANCE: composition of coating consists of 4 components and has following ratio of ingredients: main water 55.0-56.0%, industrial coal of grade P 701 - 38.7-39.1%, industrial disperser of grade B - 2.7-2.9%, white electro-corundum of grade 25A F120 - 2.7-2.9%.

EFFECT: manufacture of items with required complex of physical-mechanical properties and guaranteed level of quality after sintering; coating facilitates protection from carbonisation of hard-alloy items and from carbon porosity in them during sintering; preparation of coating is simple and inexpensive.

2 dwg, 2 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention can be used for long-term protection of chemical equipment from diluted and concentrated acids and alkalis. The anti-corrosion composition contains the following in pts.wt: sealant 51-G10 100, zinc oxide or magnesium oxide 0.01-2.0, stearic or oleic acid 0.01-0.2, sulphur 0.2-5.0, polysulphide oligomer 0.01-2.0, zinc dithiocarbamate 0.1-2.0, diphenylguanidine 0.1-0.5, cyclohexanone 0.5-2.0. Sealant 51-G10 contains a solution of butadiene styrene thermoplastic elastomer DST-30-01 in butylacetate, filer, indene-coumarone resin and aerosil.

EFFECT: invention enables to shorten the duration of the cycle of preparing a homogenous composition to 24 hours without deterioration of operational characteristics of the coating material.

2 tbl

FIELD: chemistry.

SUBSTANCE: composition contains the following in wt %: 16-23 film-forming agent; 38-40 mixed pigments; 2.0-3.0 organic complexing agent - tanning and derivatives thereof; 1.0-2.0 inorganic filler - talc; 3.0-4.0 mixture of C2-C4 alcohols and an organic solvent - the rest. The film-forming agent is 12-15 wt % alkyd varnish and additional 4-8 wt % synthetic chlorinated rubber. The mixed pigments are in form of a mixture of zinc oxide, zinc powder and micaceous iron. The mixture of alcohols contains ethyl alcohol, butyl alcohol and isobutyl alcohol in ratio 1.0:1.0:1.4. The invention enables to obtain compositions with service life of coatings of at least 10-15 years.

EFFECT: coatings have good impact properties and high rate of drying, priming composition does not require surface mechanical pre-treatment in order to remove scales and rust.

6 cl, 3 tbl, 3 ex

FIELD: construction.

SUBSTANCE: anti-corrosion protective coating consists of the first element - a single-component moisture-hardened isocyanate primer, which contains at least 75 wt % of a nonvolatile residue and 6…8 wt % of isocyanate groups. The second element is a thick-layer external coating, to produce which a double-component polyurea-urethane mastic is used, containing an isocyanate prepolymer on the basis of diphenyl methane diisocyanate with mass portion of NCO-groups making 15…17% and dynamic viscosity at the temperature of (20±3)°C - 3…10 Pa·s, and the component it hardens with active atoms of hydrogen with hydroxyl number making 95…105 mgKOH/g, mass portion of total titrated nitrogen of 4.2…4.5%, containing a mixture of simple or complex polyester diol with molecular weight of 800…1000 c.u., sterically hindered diamine with amine number of 12…16.7%, oxypropylated ethylene diamine with hydroxyl number of 640…800 mgKOH/g and liposoluble organic pigments, at the ratio of isocyanate prepolymer to a component with active atoms of hydrogen, which ensures hardening of a thick-layer external coating until the required level of operational characteristics is produced.

EFFECT: coating ensures high level of adhesion, resistance to cathode lamination with preservation of the main physical-mechanical indices and ecological safety in process of insulation works.

3 tbl

FIELD: metallurgy.

SUBSTANCE: water composition for metal coating consists of alkyl-poly-saccharide surface active substance, and of alkoxylane contained in concentration within range from 1 to 10 wt %, chosen from group containing of γ-aminopropyltrimethoxysilane and γ-glycidoxipropyltrimetoxysilane, water, not necessarily, alcohol, but only silane generated at silane hydrolysis, and not necessarily one or more components chosen from group consisting of biocides, anti-foaming agents and adhesion activators. The procedure for application of silane coating on surface of metal consists in interaction of metal surface with the said composition for sedimentation of alcoxisilane on metal, in drying surface of metal with alcoxisilane settled on it and in forming coating including hydrophobic plexiform net of covalent siloxane bonds on surface of metal.

EFFECT: metal with coating resistant to corrosion.

20 cl, 2 dwg

FIELD: chemistry.

SUBSTANCE: method involves applying coating material onto a metal substrate using a knife coater, by dipping, spray-lacquering, using rolls, by soaking or pouring. The coating material contains an easily oxidisable organic or organo-inorganic binder, with easily oxidisable organic components, and electroconductive metallic or non-metal filler. In order to ensure capacity for bonding, the binder also contains compounds which, when heated in reducing conditions at 840°C, form an electroconductive phase. The coating material can contain electroconductive compounds which are resistant to oxidative processes at high temperature, as well as lubricants, pigments, grease and metals. The metal substrate used is steel, a steel alloy or steel with a metal coating. After applying the coating material onto the substrate, the composite coating material/substrate is heated to temperature 600-1300°C. The applied coating layer changes its structure and serves as an adhesive underlayer for other coating materials.

EFFECT: obtained layer structure has sufficient electroconductivity, needed for application in common types welding, particularly dot welding.

13 cl, 4 ex

FIELD: construction.

SUBSTANCE: adhesive composition includes methyl methacrylate and benzoyl peroxide. The adhesive composition additionally contains triethanolamine, epoxy resin and a marshallite filler. Using the adhesive composition makes it possible to considerably increase the depth of porous material impregnation and to improve evenness of composition hardening in concrete. The adhesive composition may be used as a protective anticorrosion coating, in repair of various concrete structures from filling small cracks to puttying large defects, and also as a filling polymer composition for porous materials.

EFFECT: increased protection of concrete surfaces.

2 tbl, 7 ex

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