Biocidal/hydrophobic inner coating of condenser tubes (industrial turbines and secondary cooling loops)

FIELD: chemistry.

SUBSTANCE: coating has surface tension less than 20 mN/m, wherein the coating material used is hydrolysis-resistance lacquers, and where the hydrolysis-resistant lacquers are selected from a group consisting of polyurethanes, acryl and silicones, where the coating has a random topography with roughness of less than 500 nm, preferably less than 300 nm.

EFFECT: coating prevents deposit of bacteria and improves thermal conduction of the coated material.

19 cl, 4 dwg, 2 ex

 

The present invention relates to the coating of tanks and pipes, for example, from metal, glass, plastic or ceramic, in particular of condenser tubes, to reduce or prevent the formation of biofilms, as well as to a method for coating.

Thanks to the optimum temperature for organisms, such as condensing tubes industrial turbines and other heat exchangers may be formed biofilms, algae growth, so-called boonratana.

Biofilm is a permanent refuge for microorganisms (e.g. bacteria, algae, fungi, protozoa). Biofilms are formed mainly in aquatic systems, if the surfaces bordering the solid phase, live microorganisms. In addition to microorganisms, biofilm contains mainly water. Released from the microorganisms of extracellular polymeric substances (EPS) form together with water, hydrogels, so what occurs is similar to the mucus matrix - glycocalyx, which gives the biofilm stable form and allows microorganisms to keep all materials and fabrics. The glycocalyx consists of biopolymers. Under them we mean a wide range of polysaccharides, proteins, lipids and nucleic acids.

Glycocalyx protects the bacteria from the external environment such as temperature changes, the speed of the course is etc. I For water conveyance channels glycocalyx bacteria are supplied with oxygen and nutrients. Due to its sorption properties, this leads to the enrichment of nutrients, and therefore it is part of a strategy of ensuring the survivability of organisms biofilms in oligotrophic environment.

The boundary layer of water cells or whole parts of the biofilm can again and again to pull away and capture the current passing water. Themselves biofilm filter arriving new cells and bacteria and decide whether brought in from outside particles to remain or be expelled. When this intercellular communication required for biofilm differentiation and also called the "transmission of signals from cell to cell", are sent to the appropriate mediators and signaling molecules.

The main purpose of this information exchange is the regulation of gene expression, which only ultimately makes possible the orderly structure of the biofilm system. This intercellular information exchange is based primarily on the continuous issuance of mediators through the cells of bacteria in low concentrations. This principle is dependent on the density of cells regulation of gene expression is called "Quorum sensing". In this case we are talking about the system of inter - and intracellular communication and regulation by signaling molecules autoinduction. This system allows the cell suspension to determine by autoinduction density cell population and to respond to it. Depending on the density of cells, the concentration of signal molecules in the environment increases and after reaching a critical threshold concentration induces in bacteria transcription of specific gene products that lead to directed change of the phenotypic features of microorganisms.

Industrial systems technology or production of water, as, for example, open or closed water circulation system, water treatment system and the system of economic-drinking water supply, or water cooling, provide suitable conditions for growth of microorganisms. Biofilm leads to changes in physico-chemical properties of the discussed materials, for example, with regard to their resistance to friction, diffusion properties or thermal conductivity. In addition, the deposition of organisms in the biofilm can also accelerate corrosion of the material on which it rests, in this case say about the bio-corrosion. Biocorrosion causes mainly changes in the structure and stability of the material through impairing the aesthetic appearance of discoloration, precipitation products of metabolism, directly or indirectly, corrosive, until enzymatic decomposed whom I discussed materials.

Due to biofouling and bio-corrosion can cause various injuries, such as increased thermal resistance and the associated increased pressure in the condenser, the deterioration of water quality, security problems, for example, due to clogging of valves, increased cleaning costs, downtime, encumbrance parts of the installation procedures for cleaning, reduced plant productivity, reduced service life, the worst cooling capacity with increased energy consumption and increased use of biocides and cleaners and thereby increased load on wastewater.

Have developed various measures to prevent or retard the formation of biofilms or for the removal of biofilms. These include mechanical destruction of biofilms, measures of disinfection and decontamination of water and enzymatic processes for the removal of biofilms.

To prevent or eliminate sediment units are used for cleaning pipes, for example company Taprogge, primarily with floating rubber balls, which are held through the installation with cold water on the circuit. These units are very expensive and rarely used in the capacitors of smaller size, for example, in industrial turbines and side contours circulation. Other traditional ways of preventing boorstin who I am, for example, the construction of the pipeline, which leads to a velocity of 2-3 m/s, two-piece design of the condenser, two-line system pipe cleaning, backwashing condenser and heat treatment.

Although the deposition of bacterial slime can effectively control biocides, but the biofilm provides the microorganisms some protection. Accordingly, it requires very high concentrations of biocides to kill bacteria, which is undesirable from the point of view of ecology. In addition, microorganisms are very difficult to separate from biofilms. To prevent the formation of biofilms currently used biocides, such as, for example, sodium hypochlorite and chlorine dioxide.

Metals such as copper, aluminum and zinc, and in some cases also silver are toxic to bacteria. For example, antifouling Cuprion used copper and aluminium anodes in an isolated steel frame, which serves as a cathode. However, soluble biocides go into the coolant water in the form of copper ions, respectively, of aluminum.

In the document DE 102 25 324 A1 is used antimicrobial (acrylic) varnish with nanoparticles that are less than 100 nm, the surface of which is enriched with silver ions or copper or silver and copper in elemental form. Biocidal action was able to confirm, for example,in the case of particles of TiO 2covered Si.

The document DE 103 37 399 A1 describes a method of producing a substance containing colloidal silver, and his introduction to lucky. Entered complexes of amine and diamine silver-based components epoxysilane. Particles of colloidal silver have a diameter of 5-30 nm, which allows a controlled return Ag. Lucky find biocidal or bactericidal effect.

Although the bactericidal action of silver is known, the mechanism disclosed more fully. The silver particles are physiologically compatible. However, salts of silver as silver nitrate, found in the zeolites only a slight antibacterial effect. In addition, over time, the silver particles are washed away and the controlled output. The study authors present invention showed that the antibacterial effect of systems on the basis of silver falls in two weeks.

Document DE 696 23 328 refers to the composition that contains mannanase to prevent and/or remove biofilm from the surface. Document DE 696 19 665 discloses an enzyme that breaks down the exopolysaccharides, which are capable of decomposing kolovou acid. However, this enzymatic method is not preventive, but used on existing biofilms.

Object of the invention is to develop an improved coating that significantly reduces or is RedTram the biofilm, in particular, in the heat exchanger as condenser tubes (industrial turbines), and side cooling paths, and find a way of obtaining them. The floor should:

to prevent the mechanism of sediment bacteria and thus prevent or minimize deposition,

- allow to renounce the use of soluble biocidal chemicals or toxic metals and thanks be done, for example, the relevant power of less environmentally harmful,

- to improve or not to limit thermal conductivity of the material covered,

- it is good to keep covered with the material and be resistant to hydrolysis,

- allow significantly lower maintenance costs in comparison with mechanical cleaning processes.

This problem is solved by coating on paragraph 1 of the claims and the way to the distinctive features of the item 14. A preferred form of implementation and enforcement of the invention are given in the dependent clauses.

It was unexpectedly found that the objective of the invention is solved in that the coating has the following combination of properties:

- prevent the formation of a water film due to hydrophobic surfaces,

- reduction of the surface tension due to the nanoparticles,

- increase heat and electric conductivity due to the composites with nano - and/or microparticles,/p>

- resistance to hydrolysis due to the application of stable towards hydrolysis of polymers

- protection of pipelines against corrosion.

A hydrophobic surface coating according to the invention prevents the formation of a water film. It is known that the formation of deposits can be suppressed by covering the discussed surfaces by low-energy material. This surface tension is described wettability (cf. figure 1). Contact or boundary angle θ of a drop of liquid depends on the surface tension of the liquid, σ1and the surface of the substrate, σsand is a measure of the energy of the interaction between solid and liquid. The tension at the interface between the fluid and the surface of the substrate is σs1.

Sustainable water film on the surface would be conducive to the deposition of bacteria. The coating according to the invention creates a superhydrophobic surface with a surface tension less than 20 mn/m, allowing the formation of stable water film and thus the deposition of bacteria is reduced or prevented. In one form of implementation of the surface tension is less than 15 mn/m In another form of implementation of the surface tension of less than 10 mn/m

As the coating material according to the invention are suitable thermostable metal - alkoxide mA the materials, which preferably can be obtained by Sol-gel method. Hybrid Sol-gel polymers otverzhdajutsja thermally and UV-irradiation.

Antiadhesive coatings based on Sol-gel have a mesh with organic and inorganic components.

In principle, in the present invention are applied alkoxides of metals of the General formula (I)

Xn-M-(OR)m_n(I)

in which

X is a branched or linear C1-C12-alkylsilanes residue or C1-C12-arielly balance, and alkalinity balance or arielly balance, additionally substituted by one or more C1-C12-alkoxy - and/or C1-C12-arroxyjoype, splitting the exopolysaccharide. Suitable residues X preferably include methyltrimethoxysilane, methyltriethoxysilane, tetraethoxysilane, propyltrimethoxysilane, propyltriethoxysilane, isobutyltrimethoxysilane, isobutyltrimethoxysilane, octyltriethoxysilane, hexadecyltrimethylammonium, octadecyltrimethoxysilane, phenyltrimethoxysilane and phenyltriethoxysilane;

M can be any metal or element, which contains several residues Xnand (OR)m-n. Preferably M=Al, Si, Ti or Zr, more preferably M=Si;

R denotes a branched or linear C1-C5-alkyl about who headed the remainder of or aryl residue or a substituted them silyl residue. Preferably R contains ethyl group (tetraethylthiuram), ISO-propyl group or trimethylsiloxy group.

Values for m, n or n' is obtained from the valency of the metal element M and can be selected accordingly. It is generally thought that m and n are positive integers ≥1 and, moreover, n'=m-n. For example, m=4 to M=Si, Ti, Zr, m=3 for M=Al, n=1 to 3 for M=Si, Ti, Zr, and n=1-3, M=Al.

Further, according to the invention suitable coating, which consist of the usual stable to hydrolysis varnishes. Preferably the paint system is selected from the group consisting of polyurethane, acrylic and silicone.

In the silicones silicon atoms linked by oxygen atoms in the molecular chain and/or mesh structure. While the rest of the free valence electrons of the silicon are saturated hydrocarbon residues, for example, methyl groups, as shown in the formula (A).

As silicones are particularly suitable cross-linked polymethylsiloxane or polymethylphenylsiloxane and Versiliana. Versiliana are resistant to heat and oxidation silicones, among which methyl group is substituted by an alkyl fluoride groups. For example, we use one - or two-component silicone rubbers, such as Powersil 567 or Elastosil RT 675 Wacker Chemie AG. These silicones are heat-resistant, hydrophobic, Elektricheskie and generally considered to be physiologically compatible.

Coating of the present invention can be applied using conventional well-known specialist of ways, such as dipping, inkjet obliv, spray or squeegee. A method of obtaining a coating in accordance with the invention for tanks and pipes, in particular, condenser tubes, to reduce or prevent the formation of biofilms differs in that it comprises the following stages:

- preparation of a coating system selected from stable to hydrolysis varnishes group consisting of polyurethanes, acrylics and silicones;

- the application of paint systems on at least one of the coated surface by dipping, inkjet pour, spray or squeegee, and the lacquer mix of micro and/or nanoparticles;

curing paint systems, and the curing of silicone, acrylic and polyurethane systems is carried out at temperatures from 15 to 50°C.

The coating according to the invention has a layer thickness of preferably more than 10 μm, preferably from 30 to 150 μm, more preferably from 50 to 100 μm so that the surface roughness of the source material are aligned. Because of the small thickness of the hydrophobic coating, the pressure loss in the pipe is not reduced. In any case, the layer thickness is chosen so that it was possible roughness of the IP is the same material.

In one form of implementation simultaneously with the functionalization of the surface is obtained adding to the coating of micro and/or nanoparticles, a certain stochastic microroughness in regard to the maximum common difference of the heights of the elevations and depressions in the surface, which additionally improves the adhesive properties of bacteria. In one form of implementation, the coating has a roughness (defined according to DIN 4762, ISO 4287/1) less than 200 nm, preferably less than 150 nm, and/or stochastic topography with a roughness of less than 500 nm, preferably less than 300 nm.

The figures shown:

- figure 1: contact or boundary angle θ of a liquid drop as a measure of the energy of interaction between solid and liquid,

- figure 2: surface coating according to the invention in the increase of 3 μm, which is caused by the microparticles stochastic topography 500 nm. The roughness Ra is less than 500 nm,

- figure 3: surface coating according to the invention in the increase of 3 μm, which is caused by the microparticles stochastic topography 500 nm. The roughness Ra is less than 500 nm,

- figure 4: smooth the surface coating according to the invention in the increase of 3 μm, which does not contain microparticles and has a roughness Ra of less than 50 nm.

Suitable micro - or nanocat the Itza, that may be contained in the coating according to the invention are selected from the group consisting of SiO2, Al2O3, SiC and BN. The particles have a size of from 0.5 μm to 5.5 μm, preferably from 0.5 μm to 2.0 μm. If you choose the smaller size of the particles, the polymer system is already at a content of 10 vol.% will be plastic.

In one form of implementation of the particles are particles of SiO2in particular, fluorine functionalized particles of SiO2. In another form of implementation of the particles are particles of BN. According to the invention, the coating contains particles in an amount of from 10 to 35 vol.%, preferably from 25 to 32%, particularly preferably 30 vol.%. With a volumetric content of up to about 30% of the conductivity of the system almost does not depend on the hardening phase. In this case, the particles are completely surrounded by a layer of synthetic material. When the degree of filling of up to 30% vol. another smooth layers.

The resulting contact angle (water) of the standard polyurethane and silicone varnishes lies in the range from 95 to 100°. The fluorine functionalized particles of SiO2or the BN particles contact angle can be increased to 140°, for which the surface tension can be lowered to values less than 15 mn/m

With the introduction of in floor heat-conductive particles with adhesive properties, such as particles of boron nitride, can more is positive to reduce the surface tension to values below 15 mn/m Scaly particles BN due to the very good thermal conductivity of boron nitride lead to better heat transfer. In addition, due to the antistatic silicone coatings with conductive particles preventing static electrification.

In one form of implementation in coating contains particles of BN. With the introduction of electrically insulating BN particles with dimensions mentioned above, the coating according to the invention, which has significantly increased the contact angle and has a high thermal conductivity. The conductivity depends on the size and morphology of the injected particles. Possible morfologiya are, for example, spherical, frayed or layered structure, the preferred lamellar morphology.

The transmission of signals from cell to cell on the surface of bacteria by mediators causes, as a rule, additional adhesion of bacteria. On the contrary, the transmission of signals from cell to cell degraded proteins causes a further suppression of the adhesion of bacteria. In one form of implementation in floor enter the mediators, who for a long time effectively suppress the transmission of signals from cell to cell and thereby further deposition of bacteria. Suitable mediators include, for example, homoserine (HSL); AHL and N-acyl-homoserine in the case of gram-negative mikroorganizmov peptides, subjected to posttranslational modification, in the case of gram-positive microorganisms. Mediators are described, for example, Skiner, etc. in the work FEMS Environ. Rev. (2005) and include such compounds as 3-oxo-C6-HSL (Vibrio fischeri), 2-heptyl-3-hydroxyl-4-quinoline (Pseudomonas aeruginosa), butyrolactone (Strptomyces griseus), cyclic thiolactone (type III) (Staphylococcus aureus), S-THMF-borate (V. harveyiand R-THMF (S. typhimurium).

The way to obtain

A method of producing a coating according to the invention includes the following steps:

- preparation of metal-alkoxides Zola with organically modified metal alkoxide of General formula I as source material

Xn-M-(OR)m-n(I)

where

X is a branched or linear C1-C12-alkylsilanes residue or C1-C12-arielly balance, and alkalinity balance or arielly balance, additionally substituted by one or more C1-C12-alkoxy - and/or C1-C12-arroxyjoype;

M means a metal or element;

R denotes a branched or linear C1-C5is an alkyl residue or an aryl residue or a substituted them silyl residue;

m and n are integers, and m or n≥1, and, in addition, n'=m-n;

or alternative coating system selected from stable to hydrolysis varnishes from the group Castiadas polyurethanes, acrylic and silicones;

- application of Zola or coating system on at least one of the coated surface by dipping, inkjet pour, spray or squeegee,

curing the metal-alkoxide Zola or paint system, and the curing of silicone, acrylic and polyurethane systems is carried out at temperatures from 15°to 50 ° C; and curing the metal-alkoxide Zola is a result of the hydrolysis and condensation of alkoxide of metal using heat or UV radiation.

At the same time balances X preferably include methyltrimethoxysilane, methyltriethoxysilane, tetraethoxysilane, propyltrimethoxysilane, propyltriethoxysilane, isobutyltrimethoxysilane, isobutyltrimethoxysilane, octyltriethoxysilane, hexadecyltrimethylammonium, octadecyltrimethoxysilane, phenyltrimethoxysilane and phenyltriethoxysilane. Preferably, in addition, M=Al, Si, Ti or Zr, more preferably M=Si. R preferably includes ethyl group (tetraethylthiuram), ISO-propyl group or trimethylsiloxy group.

The thickness of the coating layer according to the invention of 10-150 μm, preferably 50-130 μm and particularly preferably from 50 to 100 microns.

In one form of implementation of at least one surface is an internal surface of the pipe.

In a different implementation as the e of the material for the coating is applied silicone, which contains from 10 to 30 vol.% particles of boron nitride.

Cover the surface before applying Zola or paint systems can be cleaned with an organic solvent and grease. Alternatively, before applying Zola or paint system to be applied to cover the surface of the primer layer and/or adhesion promoter. Cover the surface before applying Zola or paint systems can also cover the molecular layer of silanes or siloxanes.

If the surface coating is a spray, it is possible to carry out the method by plastocor in which to cover long cooling tube with a relatively small diameter is used telescopic design with a spray nozzle.

The hydrophobic coating according to the invention was tested for its biocidal action on the grounds of special steel and titanium. A layer thickness of about 100 μm on the titanium base was achieved by a contact angle with water in the range of 130-145°.

The coating according to the invention has a high resistance to hydrolysis. The achieved surface tension stored for several months even when stored in water. For example, in the case of filled BN silicone coating and after curing for 40 weeks in river water covered on the basis of more than put off any bacteria.

When BN in the floor about 30% vol. worked thermal conductivity greater than 3 W/MK.

When using these biocidal materials in the cooling circuit can be avoided soluble biocides. Ideally, it is possible to dispense with the installation for cleaning pipes. Further advantages are the saving performance of installation, longer service life installation and lower cleaning costs.

Hereinafter the invention will be more clarified in the accompanying examples, which, however, it is not limited.

Example 1

Steel pipe from the inside handle standard adhesion promoter Wacker Chemie AG and then spray applied silicone varnish. In silicone varnish in advance was added 30% vol. scaly BN particles of submicron size (BN CTP05, from the company Saint-Gobain). Damage to the nail utverjdayut at a temperature of about 30°C.

Example 2

In the process by plastocor on the inner side degreased titanium tubes put polyurethane varnish with 20 vol.% particles of SiO2, functionalized with fluorine. Damage to the nail utverjdayut at a temperature of about 20°C.

1. Coating for tanks and pipes, in particular of condenser tubes, to reduce or prevent the formation of biofilms, characterized in that the coating has a surface tension of less than 20 mn/m, and as the coating material used is resistant to hydrolysis varnishes, and where resistant guide is Aliso lucky selected from the group consisting of polyurethanes, acrylics and silicones, where the coating has a stochastic topography with a roughness of less than 500 nm, preferably less than 300 nm.

2. The coating according to claim 1, where its thickness is from 10 to 150 μm, preferably from 50 to 130 μm, and particularly preferably from 50 to 100 microns.

3. The coating according to claim 1, where the coating contains micro - or nanoparticles selected from the group consisting of SiO2, Al2O3, SiC and BN, with a particle size of from 0.5 μm to 5.5 μm, preferably from 0.5 μm to 2.0 μm.

4. The coating according to claim 3, where the nanoparticles SiO2are functionalized with fluorine particles of SiO2.

5. The coating according to claim 3, where the nanoparticles are particles of BN.

6. The coating according to claim 3, where the particles contained in the coating in an amount of 10-35%, preferably 25-32%, particularly preferably in the amount of 30 vol.%.

7. The coating according to claim 1, where the coating further comprises conductive particles.

8. The coating according to claim 1, where the surface tension is less than 15 mn/m

9. The coating according to claim 1, where the surface tension is less than 10 mn/m

10. The coating according to claim 1, where the silicone is selected from the group consisting of polymethylsiloxanes, polymethylphenylsiloxane and Versiliana.

11. The coating according to claim 1, where the coating has a roughness of less than 200 nm, preferably less than 150 nm.

12. The coating according to claim 1, where the coating additionally content the t explicit mediators to suppress the transmission of signals from cell to cell.

13. A method of producing a coating according to claim 1 for tanks and pipes, in particular of condenser tubes, to reduce or prevent the formation of biofilms, characterized in that it comprises the following stages:
- preparation of a coating system selected from stable to hydrolysis varnishes group consisting of polyurethanes, acrylics and silicones;
- the application of paint systems on at least one of the coated surface by dipping, inkjet pour, spray or squeegee, and the lacquer is diluted with micro and/or nanoparticles;
curing paint systems, and the curing of silicone, acrylic and polyurethane systems is carried out at temperatures from 15 to 50°C.

14. The method according to item 13, where at least one surface is an internal surface of the pipe.

15. The method according to item 13, where the silicone system contains from 10 to 30 vol.% particles of boron nitride.

16. The method according to item 13, where at least one of the coated surfaces before applying paint systems are cleaned with an organic solvent and degreasing.

17. The method according to item 13, where at least one of the coated surfaces before applying paint systems cover the primer layer and/or adhesion promoter.

18. The method according to item 13, where at least one of the coated surface before applying lacors the offered system covering the molecular layer of silanes or siloxanes.

19. The method according to item 13, where the thickness of the coating layer is from 10 to 150 μm, preferably from 50 to 130 μm, and particularly preferably from 50 to 100 μm.



 

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FIELD: chemistry.

SUBSTANCE: invention relates to an anti-fouling paint composition with high content of non-volatile components used for forming an anti-fouling coating film on the surface of a base such as underwater structures, outer sides of ships, fishing nets and fishing installations. The composition contains: (A) a carboxyl group-containing copolymer which has a structural unit obtained from a monomer (a1) of an unsaturated carboxylic acid and a structural unit obtained from another monomer (a2) of an unsaturated compound which copolymerises with monomers (a1) of the unsaturated carboxylic acid, and has average molecular weight of 1000-6000, measured using gel-penetrating chromatography, (B) a polyvalent metal compound capable of reacting with the carboxyl group of copolymer (A),and (C) an anti-fouling agent, where monomer (a1) of unsaturated carboxylic acid is (meth)acrylic acid, the other monomer (a2) is an unsaturated compound which is at least one type of monomer selected from a group consisting of alkyl(meth)acrylate and styrene and the polyvalent metal compound (B) is zinc oxide.

EFFECT: anti-fouling paint composition with high content of non-volatile components enables to obtain an anti-fouling coating film which has less effect on the environment and human body and has high resistance to fouling, retains these properties and has excellent mechanical strength.

62 cl, 22 dwg, 10 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to agents for protection against algae fouling of bottoms of ships and hydraulic structures, and specifically to antifouling enamel. When realising the method, benzene sulphonic acid, cyclohexanone, a mixture of salicylic acid and salicylic acid anilide and acetone in ratio of 0.9-0.3:3.2-2.6:2.1-1.5:10.6-9.0 wt % are mixed at 18-22°C for not less than 1 hour. A copper-containing biocide - copper oxide is then added and the mixture is saturated for 25-40 minutes. The obtained mass is treated with 50-60% colophony solution in a solvent at 18-25°C, and then combined with the remaining portion of colophony, film-forming agent epoxy-ether lacquer, copolymer of vinylchloride and vinylacetate, epoxy diane resin, plasticiser - dibutylphthalate, a pigment - zinc oxide, after which the mixture is dispersed to degree of grinding of 50-70 mcm.

EFFECT: slower leaching of copper oxide and reduction of its consumption, as well as increased elasticity of the coating.

1 tbl, 2 ex

FIELD: chemistry.

SUBSTANCE: room temperature fast-curable organopolysiloxane composition contains: (A) diorganopolysiloxane with a hydroxy group on both ends and/or a hydrolysable group, (B) alkenoxysilane of formula: R1x-Si(O-CR2=CR3R4)4-x where R1 and R2 are independently an unsubstituted or substituted univalent hydrocarbon group; R3 and R4 are independently a hydrogen atom or a substituted or unsubstituted univalent hydrocarbon group; under the condition that R2 and R3 can together represent an alicyclic hydrocarbon group containing a C=C double bond in the formula given above, with carbon atoms, with R2 and R3 bonded thereto, x equals 0 or 1; or partial hydrolysate thereof, (C) aminosilane of formula: R5y-Si(NHR6)4.y, where R5 is a substituted or unsubstituted univalent hydrocarbon group; R6 is a substituted or unsubstituted univalent hydrocarbon group; and y equals 0 or 1; or partial hydrolysate thereof, and (D) a curing agent. The method of curing a room temperature fast-curable organopolysiloxane composition involving coating a substrate with a first portion of the composition containing components (A), (B) and (D), coating another substrate with a second portion of the composition containing components (A), (C) and optionally (D), and binding the substrates by curing the first portion of the composition together with the second portion of the composition.

EFFECT: obtaining a room temperature fast-curable organopolysiloxane composition capable of fast and complete curing.

12 cl, 5 tbl

FIELD: machine building.

SUBSTANCE: using mould recovery method in the manufacture of production tooling, made of silicon elastic material, the surface of a mould is pre-treated with a solution of amine or amine mixture in an organic solvent. Then repair mortar is applied, containing high molecular weight silicone rubber, a curing agent and an organic solvent, which additionally may contain a solution of amine or amine mixture in an organic solvent. The invention also relates to a composition for restoring of moulds, made of silicone elastic material. The composition contains a high molecular weight silicone rubber, a curing agent, an organic solvent solution of an amine or a mixture of amines in an organic solvent at a ratio of the wt % - Amine: rubber from 1:20 to 1:50.

EFFECT: when restoring a damaged mould the surface is hardened that prolongs the use of a mould, ensures good traction with the surface of the mould, curing of reducing layer is accelerated, its uniformity is achieved on a complex profile of a mould.

3 cl, 2 dwg, 2 tbl, 6 ex

FIELD: chemistry.

SUBSTANCE: disclosed is a method of producing yttrium-containing organoaluminoxane siloxanes of general formula (1), where k, m, g=3-12; s+t+2r=3; 1+x+2y+z=3; R-CnH2n+1, n=2-4; R* - C(CH3)=CHC(O)CnH2n+1; C(CH3)=CHC(O)OCnH2n+1; R** - C(CH3)=CHC(O)CH3; R*** - OC2H5, CH3, CH2=CH, by reacting chelated polyalkoxy aluminoxanes with tetraethoxy silane, alkyl(alkene)- or alkoxysiloxanes and yttrium acetyl acetonate hydrate of formula {[CH3(O)CCH=C(CH3)O]3Y·2.5H2O} in the medium of an organic solvent at temperature 20-50°C. The invention also discloses binding and impregnating compositions for obtaining chemical-resistant, high-strength oxide protective coatings containing yttrium-containing organoaluminoxane siloxane of general formula [(R**O)sY(OH)tOr]k·[Al(OR)l(OR*)x(OH)zOy]m·[SiR***2O]g (1) (5-90 wt %) and a solvent (the balance up to 100 wt %).

EFFECT: yttrium-containing organoaluminoxanes obtained using the disclosed method are soluble in organic solvents and hydrolytically stable in atmospheric air.

2 cl, 5 dwg, 3 tbl, 6 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a single-component, low-temperature coating composition which is hardened in a wet environment and is stable during storage, and contains silicone with silanol functional groups, silicone with alkoxyl functional groups, a plasticiser containing a product of reaction of two or more reagents and a hardener selected from amines, aminosilanes, ketimines, aldimines and combinations thereof. The invention also relates to substrates coated, at least partially, with said composition.

EFFECT: improved flexibility, elongation and bending of the coating, while preserving good drying time, chemical resistance and stability during storage of the single-component composition.

14 cl, 7 tbl, 11 ex

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

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: chemistry.

SUBSTANCE: antifouling coating composition contains a curable polymer which is an organosiloxane-containing polymer and an organosilicon polymer which is liquid, having general formula: , where R1 can be identical or different and are selected from alkyl, aryl and alkenyl groups, optionally substituted with an amino group, an oxygen-containing group of formula OR5, where R5 is hydrogen or C1-6 alkyl, and a functional group of formula (I): -R6-N(R7)-C(O)-R8-C(O)-XR9 (i) where R6 is selected from alkyl, hydroxyalkyl, carboxyalkyl containing 1-12 carbon atoms, and polyoxyalkylene containing up to 10 carbon atoms; R7 is selected from hydrogen, alkyl, hydroxyalkyl, carboxyalkyl containing 1-6 carbon atoms, and polyoxyalkylene containing 1-10 carbon atoms; R7 can be bonded with R8 to form a ring; R8 is an alkyl group containing 1-20 carbon atoms; R9 is hydrogen an alkyl group containing 1-10 carbon atoms, optionally substituted with oxygen- or nitrogen-containing groups; X is selected from O, S and NH; under the condition that, at least one R1 group in the organosilicon polymer is a functional group of formula (I) given above or a salt derivative thereof; R2 can be identical or different and are selected from alkyl, aryl and alkenyl; R3 and R4, which can be identical or different, are selected from alkyl, aryl, blocked or non-blocked polyoxyalkylene, alkaryl, aralkylene and alkenyl; a is a whole number from 0 to 50000; and b is a whole number from 0 to 100, where a+b is equal to at least 25.

EFFECT: obtaining a composition with low surface tension, suitable elastomeric properties, which reduces attack by fouling organisms and their adhesion strength and can be used as a transparent coating which does not have turbidity or a milk-white colour.

8 cl, 1 tbl, 7 ex

FIELD: chemistry.

SUBSTANCE: disclosed is a method of producing a coated adhesive layer with improved optical characteristics, in which a curable composition containing curable organopolysiloxane is applied onto the surface of a substrate, and improved optical purity is achieved owing to that the composition contains a group of silicon dioxide particles having average size ranging from approximately 1 to approximately 7 micrometres. The invention also discloses a method of producing a multilayer article with improved inter-layer adhesion characteristics owing to reduction of the air space between layers, where the adhesive layer is obtained using the disclosed method, and the corresponding multilayer article.

EFFECT: higher optical purity of the coating adhesive layer and adhesion between layers in multilayer articles owing to virtually no air trapping when applying the adhesive layer.

20 cl, 6 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: composition contains polyethyl siloxane liquid, organosilicon lacquer, organic solvent - acetic ether, taken in volume ratio 1:1:1. The composition is applied by dipping, followed by free flow and then dried.

EFFECT: compositions have improved organoleptic, damping properties and increase hydrophobisating capacity of basalt fabric.

2 cl, 2 tbl, 3 ex

Laminate // 2428315

FIELD: process engineering.

SUBSTANCE: invention relates to laminate used in glass panels, lenses etc. Proposed laminate comprises base made up of polycarbonate resin, first layer resulted from hardening acrylic resin hardening, second layer produced by thermal hardening of organosiloxane resin. Acrylic resin composition comprises (A) acrylic copolymer containing at least 70 mol % of repeating link of formula (A)

,

where X is hydrogen or methyl, Y is methyl, ethyl, cycloalkyl or hydroxyalkyl with the number of atoms of 2 to 5, or residue of UV radiation absorber based on triazine; blocked polyisocyanate compound; hardening catalyst; and (D) UV radiation absorber based on triazine. Note here that total content of UV radiation absorber based on triazine in formula (A) and as component (D) varies from 1 to 40 wt %. Composition of organosiloxane resin in proposed laminate comprises (E) colloidal silicon dioxide and (F) hydrolytic condensate of alkoxy silane. Invention covers also window glass made based on said laminate.

EFFECT: higher strength and longer life.

25 cl, 15 tbl, 50 ex

FIELD: chemistry.

SUBSTANCE: invention relates to aldimines of formula (I)

where A does not contain active hydrogen and a primary amine group, or together with R7 denotes a (n+2)-valent hydrocarbon radical containing 3-20 carbon atoms and, if necessary, at least one heteroatom in form of oxygen of an ether group or nitrogen or a tertiary amine group; n equals 1, 2, 3 or 4; m equals 0,1, 2, 3 or 4; R1 and R2 each denotes a univalent hydrocarbon residue with 1-12 carbon atoms or together denote a divalent hydrocarbon radical which is part of a carbocyclic ring with 5-8 carbon atoms; R3 denotes H or alkyl; R4 and R5 independently denote CH3 or a univalent aliphatic radical containing 2-12 carbon atoms and optionally hydroxy groups; X denotes O, S, N-R6, or N-R7, where R6 denotes a univalent hydrocarbon radical containing 1-20 carbon atoms and having at least one hydroxy group; as well as curable compositions containing such aldimines and use of said compositions.

EFFECT: obtaining novel aldimines which can be used as curing agents in curable compositions.

22 cl, 18 ex, 6 tbl

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