Printing composition for obtaining electroconductive coatings based on silver particles dispersed in water, its application for obtaining electroconductive coatings, method of obtaining current-conductive paths and substrate with electroconductive coating
SUBSTANCE: invention relates to compositions for obtaining electroconductive coatings on substrates surface. Described is a printing composition for obtaining the electroconductive coatings based on silver particles dispersed in water. The composition contains: a) from 5 to 40 wt.p. of metal silver particles with an effective diameter from 10 to 150 nm, with the silver particles having bimodal distribution of particles by sizes; from 50 to 99.5 wt.p. of water and, if necessary, to 30 wt.p. of a solvent; c) from 0.01 to 15 wt.p. of a dispersing agent; d) from 0 to 5 wt.p of additives; e) from 0 to 5 wt.p. of electroconductive, if necessary, water-soluble, polymers; f) from o.5 to 5 wt.p. of a thickening agent; g) from 30 to 70 wt.p. of silver particles or silver-coated copper particles with an effective diameter from 500 nm to 10 mcm. The composition has a viscosity, at least, 1 Pa·s. Also described is the application of the composition for obtaining the electroconductive coatings, method of obtaining current-conductive paths and a polymer substrate with the electroconductive coating from the claimed composition.
EFFECT: invention provides an effective elctroconductivity of electroconductive structures on thermally stable surfaces with the application of offset printing and screen printing.
15 cl, 2 ex
The invention relates to compositions for obtaining structures of electrically conductive structures on surfaces, in particular, to a printing composition to obtain a conductive coating on the basis of the dispersed water particles of silver, its application to obtain a conductive coating, method for producing the conductive tracks and the substrate with a conductive coating.
There is a critical need for electrically conductive structures on the surfaces of objects with poor surface conductivity. In terms of conductivity, for example, applications in the integration of electrical circuits in an electronic component using a printing material held on the surface of the structural lamentablemente, is desirable. This makes it possible to minimize costly problem of the connection elements with separate circuits. In particular, special interest is the printing on the surface of elastic materials with conductive paths.
Freedom of configuration of the entire structural element with a flexible part should no longer be exposed to powerful effect provided by the schema.
In the technique has long been known application of conductive paths made of copper. However, their deposition on the surface is possible only requiring the deposition method and trawl the deposits.
Further development is electrically conductive paste (conductive silver), which can subsequently be applied on the surface and can be used for contact.
Of particular interest is the printing on polymeric materials. In the printing process, in which the surface becomes conductive, the surface of the substrate should not be heated above the softening temperature of the material surface (for example, the glass transition temperature of the polymer surface). In addition, you cannot use any solvent which dissolves or softens the surface.
By known methods, whereby on the surface of low cost and high productivity can be applied patterns are silk-screen printing or offset printing. However, both these methods require other systems used printed materials. So, the specialist is known that the ink or paint that should be used in these printing methods, demands, at least to the viscosity of the printing ink. In order to achieve good printing results, the viscosity should be in the region above 1 PA·S.
In patent applications U.S. US-A-5882722 and US-A-6036889 described conductive compositions containing metal particles, the product of the preceding stage and an organic solvent, which form the electric is provodnye patterns, only when the sintering temperature is from 200°C. These known compositions have a viscosity of about 10 PA·C. Although the data structures and can be used for the described printing methods (screen printing, offset printing), however, due to the required high temperature sintering of their applicability for use on surfaces of polymers is limited.
In the descriptions to the international application WO 2003/038002 and patent applications U.S. US-A-2005/0078158 describes compositions with silver nanoparticles stabilized, among other things, natrocarbonatite-cellulose. Although these publications and describes the need for further processing, for example, heat treatment or treatment with flocculant, however, the temperature of processing, or the conductivity obtained from the composition of the microstructures is described. In addition, does not reveal the exact size distribution used and the obtained nanoparticles, while the domain size is less than 100 nm. The content of silver particles described compositions is not more than 1.2 wt.%. For the intended inkjet method of applying the required viscosity of the ink of the printed composition is about 10 MPa·S. Therefore, the composition is hardly acceptable for screen printing or offset printing.
In the European patent EP 1586604 described silver paste consisting of epoxy resin, flakes and silver nanoparticles sulfur is RA. After printing or coating on the surface of the substrate circuit Board and the subsequent heat treatment this paste forms an electrically conductive film. When the sintering temperature above 200°C is reached the resistance less than 5·105Om/see Such a high sintering temperature severely limits the choice to be printing a polymeric substrate.
In the international application WO 2008/031015 published an aqueous composition containing flakes of silver. When using this composition can be achieved at 120°C conductivity of 0.022 Ohms/square.
The firm HARIMA offers a series of products NP Series Nano-Paste, which is a conductive silver ink on the basis of nanoparticles with low viscosity, HARIMA. However, HARIMA requires a sintering temperature 210-230°C.
There has long been an unresolved problem to obtain a conductive composition that, when used in elementary silver gives you the opportunity to receive electrically conductive patterns on a particularly thermounstable surfaces with offset printing and silk screen printing. Low temperatures in this regard include, for example, a temperature below the glass transition temperature of the polymer surface (PVC ~80°C).
The problem is solved in this invention contains a silver compound, which may be deposited on powernotebooks silk, flexo, gravure or offset printing and can specalise by further heat treatment at a temperature of ≤140°C, if possible, less than 100°C to obtain a conductive structures.
The object of the invention is a printing composition to obtain a conductive coating on the basis of the dispersed water particles of silver, containing at least:
a) from 5 to 40 wt.h. metallic silver particles with an effective diameter of not more than 150 nm, preferably not more than 100 nm, particularly preferably from 20 to 80 nm, most preferably from 40 to 80 nm, specific lateralisation spectroscopy, and the silver particles are, in particular, a bimodal distribution of particle size;
b) from 50 to 99.5 wt.h. water and, if necessary, up to 30 wt.h. solvent;
c) from 0.01 to 15 wt.h., at least one, especially polymeric dispersant;
d) from 0 to 5 wt.h. additives, preferably from 0.5 to 5 wt.h., most preferably from 1 to 4 wt.h. supplements;
e) from 0 to 5 wt.h. conductive, optionally, water-soluble polymer, preferably from 0.5 to 5 wt.h., most preferably from 1 to 4 wt.h. conductive polymer;
moreover, the composition contains additionally
f) from 0.5 to 5 wt.h., preferably from 1 to 4 wt.h. thickener and
g) from 30 to 70 wt.h. metal tactics effective diameter of not more than 10 μm, especially from 500 nm to 10 μm, preferably, silver particles or copper particles coated with silver,
and has a viscosity of at least 1 PA·S.
The sum of the mass parts of the composition is, in particular, to 100 mass parts.
Determination of particle size lateralisation spectroscopy it is known from the literature and are described, for example, in T. Allen, Particle Size measurement, Bd.1, Kluver Academie Publishers, 1999.
The dispersant preferably includes at least one agent selected from the range: alkoxylate, alkylamide, ester, aminoxide, alkylpolyglucoside, ALKYLPHENOLS, arylalkylamine, water-soluble homopolymers, water-soluble random copolymers, water-soluble copolymers, water-soluble graft copolymers, particularly, polyvinyl alcohol, copolymers of polyvinyl alcohol and polyvinylacetate, polyvinylpyrrolidone, cellulose, starch, gelatin, gelatin derivatives, polymers of amino acids, polylysin, poliasparaginovaya acid, polyacrylates, polystyrenesulfonate, polystyrenesulfonate, polymethacrylate, condensation products of aromatic sulphonic acids with fomaldehyde, naphthalenesulfonate, lignosulfonates, copolymers of acrylic monomers, polyethylenimine, poly-vinylamine, polyallylamine, poly(2-vinylpyridine), blockcopolymer, blockcopolymer with polystyrene blocks and/or p is legallydownload.
Particularly preferably, the dispersant is selected from a range of: polyvinyl pyrrolidone, blockcopolymer, blockcopolymer with polystyrene blocks. Most preferably, use polyvinylpyrrolidone with a molecular weight of from about 8,000 of atomic mass units to 400,000 atomic mass (for example, PVP K15 - polyvinylpyrrolidone with a molecular weight of 10,000 atomic mass of the firm Fluka or PVP K90 (molecular weight of about 360000 of atomic mass units) of the company Fluka) and, most preferably, also blockcopolymer with polystyrene blocks with 62 wt.% C2-simple polyester, 23 wt.% C3-simple polyester and 15 wt.% polystyrene per dry disperser, with respect to the block length of C2-polyether to C3a simple polyester 7:2 units (for example, Disperbyk 190 firms BYK-Chemie, Wesel).
Solvent b), particularly preferably, choose from a number of: alcohols containing from 1 to 5 carbon atoms, in particular, alcohols containing from 1 to 3 carbon atoms, a simple ester, especially dioxolan, glycols, especially glycerol, ketones, especially acetone.
The foaming agent (d), preferably selected from the range: polydimethylsiloxane, polyacrylate, ammonium salts of polyacrylates, siloxanes, and combinations of waxes, copolymers with pigmentation groups, low molecular weight polymers, modified cellulose, especially hydroxic cellulose or methyl cellulose and carbon nanotube and polyvinyl alcohol, preferably, hydroxyethylcellulose, methylcellulose, and carbon nanotube. The preferred foaming agent (d) is selected from the group of the above-mentioned dispersant, and particularly preferably, for example dispersant BYK 356 firms BYK-Chemie, Wesel, polyacrylate, and BYK 154 of the same company, ammonium salt of acrylic copolymers. The foaming agent (d) may also be used in any combination, preferred is a combination of hydroxyethyl cellulose and/or methyl cellulose with carbon nanotubes.
Supplement e), preferably, choose from a number of: pigments, antifoam, light, optical bleaching agent, corrosion inhibitor, antioxidant, algicide, plasticizer, thickener, surface-active substances. Especially preferred is the addition of a reducing agent, such as formaldehyde, glycerin, ascorbic acid and so on, are particularly preferably used as an additive formaldehyde.
Conductive polymer f), preferably selected from a range of polypyrrol, polyaniline, polythiophene, polyphenylenevinylene, polyparaphenylene, polyethyleneoxide, polyfluorene, polyacetylene, most preferably, polyethyleneoxide in combination with polystyrenesulfonate. Conductive salt are preferably so-called ionage the nye liquid, especially salt type of tetraalkylammonium, pyridinium, imidazoline, tetraallylsilane with fluorinated anions.
Especially preferred composition is characterized by the fact that in it the silver particles (a) have an effective particle diameter of 10 to 150 nm, preferably from 20 to 80 nm, most preferably from 40 to 80 nm. Under the effective diameter of the particles of a mean average particle diameter, specific lateralisation spectroscopy (suitable device is, for example, Brookhaven BIC-90 Plus).
The silver particles (a)preferably contained in the composition in an amount of from 10 to 35 wt.h., most preferably 15 to 30 wt.h. The content of the dispersant (c)preferably ranges from 0.1 to 15 wt.h., most preferably from 5 to 10 wt.h.
Is also favorable if the particles in the finished composition to the same capable of forming a dense packing, leading already at low concentrations and temperatures of the processing to the desired conductivity of the filled structures. The requirement of low concentration due to purely economic reasons. The smaller may be supported by the content of particles with the same or similar to the conductivity, the lower the material cost of the resulting composition. When it is desired to replace as much as possible the mass number of particles on the natives substances.
In addition, the object of the invention is the use of a composition according to the invention to obtain a conductive coating, especially, conductive paths.
The object of the invention is also a method of obtaining a conductive tracks, characterized in that on the surface of the substrate put a new song in silk screen printing method, flexo, gravure or offset printing and thermoablative, especially at a temperature of not higher than 140°C, preferably not higher than 100°C to remove residual water and, if necessary, solvents, and, if necessary, for sintering contained particle of silver.
Especially preferred composition is characterized by the fact that it uses silver particles of various sizes. It was unexpectedly found that such a distribution of particle sizes is useful for the formation of conductive structures already at lower concentrations of silver nanoparticles. It is assumed that this is due to the filling of the formed intermediate volume between the larger particles to smaller particles. As a result, during subsequent thermal processing of the ink is increased arise continuous contact surface. So the resulting composition at a lower mass particle content achieves the same conductivity ink with almost monodisperse the first distribution of particles at nearly the same effective diameter of the particles or a higher conductivity for the same mass content and the same effective diameter of the particles.
The object of the invention is also a substrate, especially a transparent polymeric substrate having a conductive coating obtained from the composition according to the invention. Preferred is a substrate which has a conductive coating contains conductive paths with a conductivity of at least 5·105SIM/m
In addition, the above requirements are met by a composition comprising nanoparticles of silver, silver particles, a solvent, a foaming agent, a dispersant and additives. Preferably, it contains a small silver nanoparticles, which mainly have an effective diameter of from 20 to 80 nm, most preferably from 40 to 80 nm, with a bimodal distribution of particles in a concentration of from 5 to 40 wt.%, preferably, from 15 to 30 wt.%. The composition, for example, may be deposited on the polycarbonate, then dried and temperarure at a temperature of at least 80°C for several minutes. Then get very firmly fixed conductive patterns or, in the plane of the drawing, the optical reflective layers, in both cases, with high strength fastening on the polycarbonate.
Preferably used in the composition of the sols of silver obtained from the silver oxide recovery in such a reducing agent as an aqueous solution of formaldehyde is (FA) after prior addition of dispersant. This silver sols receive, for example, the rapid mixing of a solution of silver nitrate with sodium hydroxide by a strong high-speed mixer in a periodic process or in a continuous process using microsociety according to the still unpublished German patent application with the document number 102006017696. Directly after that nanoparticles of silver oxide restore an aqueous solution of formaldehyde (FA) in excess in a periodic way and then purified by centrifugation or membrane filtration, preferably, membrane filtration. This production method is particularly favorable when the number of bound on the surface of nanoparticles of organic auxiliary means supported at this small and, in addition, can be obtained bimodal distribution of particle sizes. In particular, it does require a pre-processing stage, such as pre-restoration in the presence of polymers, or additional stages of post-processing in addition to energy supply, such as, for example, the activating system of the preceding product or flocculation.
Example 1: (Getting silver nanoparticles).
0,054 molar silver nitrate solution was mixed with a mixture of 0,054 molar solution of sodium hydroxide and d is supergator Disperbyk 190 (manufacturer BYK Chemie) (1 g/l) in a volume ratio of 1:1 and stirred for 10 minutes. To this reaction mixture was added with stirring to 4.6 molar aqueous solution of formaldehyde, resulting in the ratio of silver ions Ag+the reducing agent was 1:10. This mixture was heated to 60°C, held at this temperature for 30 minutes and then cooled. The particles separated in the first stage, diafiltrate from unreacted components, and then the Sol was concentrated, for which we used a membrane with pore size of 30,000 daltons. Formed colloid-stable Sol with a solids content of 20 wt.% (silver particles and dispersant). The content of Disperbyk 190 after membrane filtration according to the elementary analysis was 6 wt.% based on the silver content. In the study method lateralisation spectroscopy (Brookhaven BIC-90 Plus) the effective particle diameter of 78 nm.
In 15 ml of 20%aqueous Sol of silver nanoparticles from Example 1 was dissolved 1.5 g of polyvinylpyrrolidone PVPK 40 (SIGMA-ALDRICH) and 1.5 g of dispersant Disperbyk 190 (Altana, Byk-Additives). Then the mixture is introduced 30 g of silver powder (Metolor K-1332 P) by means of ultrasound finger (G. Heinemann, Ultraschal und Labortechnik) with an amplitude of 30% of maximum power. Immediately after this, the paste is applied by screen printing on polycarbonate film (Makrolon®, Bayer MaterialScience AG) and temperatuur at 130°C. the Achieved conductivity 2·106/sup> SIM/m
1. The printed composition to obtain a conductive coating on the basis of the dispersed water particles of silver, containing at least:
a) from 5 to 40 wt.h. metallic silver particles with an effective diameter of 10 to 150 nm, a specific laser correlation spectroscopy, and the silver particles have a bimodal distribution of particle size;
b) from 50 to 99.5 wt.h. water and, if necessary, up to 30 wt.h. solvent;
c) from 0.01 to 15 wt.h., at least one dispersant;
d) from 0 to 5 wt.h. additives;
e) from 0 to 5 wt.h. conductive, optionally, water-soluble polymers,
characterized in that the composition additionally contains
f) from 0.5 to 5 wt.h. thickener and
g) from 30 to 70 wt.h. silver particles or copper particles, silver-plated with an effective diameter of from 500 nm to 10 μm,
and has a viscosity of at least 1 PA·S.
2. The composition according to p. 1, characterized in that the dispersant (c) is at least one agent selected from the range: alkoxylate, alkylolamides, esters, aminoxide, alkylpolyglucoside, ALKYLPHENOLS, arylalkylamine, water-soluble homopolymers, water-soluble random copolymers, water-soluble copolymers, water-soluble graft polymers, especially polyvinyl alcohols, copolymers of polyvinyl alcohols and polyvinyl is zlatov, polyvinylpyrrolidone, cellulose, starch, gelatin, gelatin derivatives, polymers of amino acids, polylysin, poliasparaginovaya acid, polyacrylates, polyarilensulphone, polystyrenesulfonate, polymethacrylates, condensation products of aromatic sulphonic acids with fomaldehyde, naphthalenesulfonate, ligninsulfonate, copolymers of acrylic monomers, polyethylenimine, polyvinylene, polyallylamine, poly(2-vinylpyridine), block-Capoliveri, blockcopolymer with polystyrene blocks and/or politically-dimethylammoniumchloride.
3. The composition according to p. 1, characterized in that the dispersant (c) is chosen from the range: blockcopolymer and blockcopolymer with polystyrene blocks.
4. The composition according to p. 1, wherein the other solvent (b) is chosen from the series: alcohols containing from 1 to 5 carbon atoms, in particular, alcohols containing from 1 to 3 carbon atoms, ethers, especially dioxolan, glycols, especially glycerol, ketones, especially acetone.
5. The composition according to p. 1, characterized in that the thickener f) is chosen from the series: polyacrylate, ammonium salts of polyacrylates, siloxanes, polyethylene glycol, combinations of waxes, low molecular weight polymers, modified cellulose, especially hydroxyethylcellulose or methylcellulose, carbon nanotube and polyvinyl alcohol, preferably hydroxyethylcellulose is for, methyl cellulose and carbon nanotube.
6. The composition according to p. 1, characterized in that the thickener f) is a mixture of hydroxyethyl cellulose and carbon nanotubes.
7. The composition according to p. 1, characterized in that the additive (d) is chosen from the series: pigments, defoamers, light stabilizers, optical brighteners, corrosion inhibitors, antioxidants, algaecides, plasticizers and thickeners, surface-active substances.
8. The composition according to p. 1, characterized in that the conductive polymer (e) is chosen from the series: polypyrrol, polyaniline, polythiophene, polyphenylenevinylene, polyparaphenylene, polyethyleneoxide, polyfluorene, polyacetylene, preferably polyethyleneoxide/polystyrenesulfonate.
9. The composition according to p. 1, characterized in that the content of silver particles (a) is from 10 to 35 wt.h., preferably from 15 to 30 wt.h.
10. Composition according to one of paragraphs.1-9, characterized in that the content of the dispersant (c) is from 0.1 to 15 wt.h., preferably from 5 to 10 wt.h.
11. The use of a composition according to one of paragraphs.1-10 to obtain a conductive coating.
12. The use of a composition according to p. 11, characterized in that elektroprovodnyi coatings are conductive paths.
13. A method of obtaining a conductive tracks, characterized in that the composition according to one of paragraphs.1-10 applied to p is the surface of the substrate by screen printing, flexo, gravure or offset printing and thermoablative at a temperature not exceeding 140°C to remove water and, optionally, a solvent.
14. A polymeric substrate having a conductive coating of the composition according to one of paragraphs.1-10.
15. The substrate under item 14, characterized in that the conductive coating contains conductive paths with a conductivity of at least 5·104SIM/M.
SUBSTANCE: invention refers to electronic engineering, particularly to process of chip fabrication on metal bedding and can be implemented at radio and electronic productions. The method consists in plasma sputtering an under layer out of powder of inter metallic composition of nickel with aluminium of dimension of particles 20-70 mcm; further the method consists in spraying a layer of ceramic out of powder of aluminium oxide with silica-alumina glass, in applying borosilicate glass, whereupon surface of ceramic layer is subject to impregnation with glass, and in glasing. Forming metallised pattern of a chip is performed by the fine film process, where a minimal dimension of element is 10 mcm.
EFFECT: improved thermal resistance of multi-layer structure, elimination of cracks and chipping-off ceramic layer from metal bedding, reduced porosity of ceramic layer and upgraded reliability of chip operation.
8 cl, 1 dwg, 2 tbl
FIELD: electrical engineering.
SUBSTANCE: invention relates to multi-layer element with replicable lacquer layer wherein relief structure is formed and conducting coating is integrated. Proposed multilayer element (11, 12) has replicable lacquer layer (22). First relief structure (25, 125, 65) is formed in replicable lacquer layer (22) in the plane located in coordinate axes x and y, in multi-layer element first zone. Note here that conducting coating (231, 23n, 123n) with constant surface density is applied on replicable lacquer layer (22) in the first zone of multi-layer element (11, 12) and in adjacent second zone of said element. First relief structure (25, 125, 65) represents a structure with high depth-to-height ratio of separate structural elements, e.g. with depth-to-height ratio >2. Vertical, or almost vertical, side face passes over all, or almost all, depth of relief structure to reduce or eliminate the coating electrical conductance.
EFFECT: lower costs, higher accuracy in production.
23 cl, 7 dwg
FIELD: producing electricity-conducting tracks on transparent bases and bases using such tracks.
SUBSTANCE: electricity-conducting tracks whose width does not exceed 0.3 mm are produced on transparent base by means of stenciling using for the purpose tixotropic electricity-conducting paste characterized in ratio of transverse-strain free viscosity to transverse-strain viscosity of minimum 50 under stenciling conditions and in silver content over 35%; at least 98% of paste-forming particles measure below 25 μm, use being made of mesh incorporating at least 90 threads per centimeter for the purpose; covering of this mesh is provided with slits whose size (width) is 0.25 ± 0.05 mm; then these electricity-conducting tracks are annealed.
EFFECT: ability of current conduction at reduced width of tracks.
FIELD: electrical and radio engineering; printed-circuit board manufacture.
SUBSTANCE: proposed process includes following procedures. Computer-designed printed-circuit board wiring layout prepared primarily with aid of laser printer is applied in mirror image to glazed paper. The latter is aligned with board and pattern formed by printer powder is disposed directly on copper foil board. Blank obtained in the process is heated to temperature exceeding powder melting point.
EFFECT: facilitated procedure, reduced time for manufacturing printed-circuit boards.
1 cl, 1 dwg
SUBSTANCE: invention relates to a method of applying a coating composition containing carbon in form of carbon nanotubes, graphenes, fullerenes or mixtures thereof and metal particles on a substrate, followed by treatment under pressure and heat treatment of the coating after application on the substrate. The invention also relates to a substrate obtained using the disclosed method and use thereof as an electrochemical structural element.
EFFECT: invention provides low mechanical wear, low frictional coefficient and good electrical conductivity of the coating.
30 cl, 2 ex, 4 dwg
SUBSTANCE: described is an electroconductive thermoplastic material for electrotyping, which contains a binding substance and electroconductive filler, where the binding substance is a mixture of polyethylene wax and paraffin in ratio of 2/1 to 1/3, and the electroconductive filler is graphite, with the following ratio of components, pts.wt: polyethylene wax 10-20, paraffin 10-30, graphite 60-70.
EFFECT: material enables free casting of an original article with electroconductive material when making a mould at low temperature and simplifies the technology of making moulds.
1 tbl, 1 ex
SUBSTANCE: invention relates to production of articles with a multilayer light-sensitive coating and can be used to make thin-film solar cells and photocatalytic articles. The article has a substrate, e.g. a glass substrate, and a first coating formed on at least part of the substrate. The first coating is multilayered and contains a mixture of oxides including oxides of at least two elements selected from P, Si, Ti, Al and Zr. A functional coating is formed on at least part of the first coating. The functional coating is selected from an electroconductive coating and a light-sensitive coating. In one embodiment of the invention, the functional coating contains tin oxide doped with fluorine. In another embodiment, the functional coating contains titanium dioxide. A glass substrate, for example, is made in order to make a coated article. The first multilayer coating is formed on at least part of the substrate by chemical vapour deposition. The functional coating is formed on at least part of the first coating.
EFFECT: high functionality of the first layer of the article.
14 cl, 5 dwg, 12 tbl, 6 ex
SUBSTANCE: invention can be used to produce artificial film-type electroconductive coatings (resists) for making radar-absorbent filler. The electroconductive paint for radar-absorbent filler contains polyvinyl acetate binder, colloidal graphite, water and OP-10 emulsifying agent.
EFFECT: invention enables to obtain and control resistivity of a current-conducting coating in the range of 150-800 ohm·cm.
2 tbl, 3 ex
SUBSTANCE: preparation method involves applying a solution of discotic precursors onto a substrate, heating the coated substrate in the atmosphere of a protective gas to temperature of 400-2000°C.
EFFECT: invention enables to obtain carbon films with high thermal and chemical stability, an ultra-smooth surface and good adhesion to substrates.
20 cl, 6 dwg, 13 ex
SUBSTANCE: electroconductive composition contains the following in wt %: film-forming copolymer 13.0-45.0; graphite powder 15.5-20.0; technical carbon powder (soot) 7.5-40.0; carbonyl iron powder 3.0-4.0; organic solvent - the balance. Graphite powder is used with particle size of 10-30 mcm and technical carbon and carbonyl iron powder is used with particle size of not more than 0.1 times the maximum size of the graphite powder particles. Described is a method of making electroconductive coatings, which involves depositing a dispersed liquid polymerisable electroconductive composition onto a substrate, forming a solid electroconductive coating by depositing several layers of the composition onto the substrate. The final thickness of the electroconductive coating must be at least 10 times greater than the maximum particle size of the graphite. Intermediate drying of each layer is carried out at room temperature at pressure lower than atmospheric pressure, in an alternating electromagnetic field before the process of hardening the outer surface of the layer. Final drying of all layers of the electroconductive coating is carried out at polymerisation temperature of the electroconductive composition binder before the end of polymerisation of all layers of the electroconductive coating.
EFFECT: obtaining a solid film-type electroconductive coating with small spread of values of electrical resistance of coating samples made in the same batch.
8 cl, 2 dwg, 2 tbl, 3 ex
FIELD: textiles, paper.
SUBSTANCE: textile product at stage (a) is sealed with an aqueous printing composition, at stage (b) it is heat-treated on one or more stages, at stage (c) other metal is precipitated on the textile product of a flat shape. At that the aqueous composition contains from 10 to 90 wt % of at least one metal powder (a) selected from the group consisting of powdered zinc, nickel, copper, tin, cobalt, manganese, iron, magnesium, lead, chromium, bismuth, and mixtures of these metals and their alloys. The composition also contains from 1 to 20 wt % of binder (b) which is an aqueous dispersion of film-forming polymer, from 0.1 to 4 wt % nonionic emulsifier (c), and from 0 to 5 wt % modifier of rheological properties (d). The method is used in the manufacture of textile products heated. The resulting textile product is capable to partially conduct electricity and shield electromagnetic radiation.
EFFECT: proposed technology of production of textile products requires no special equipment, has flexibility and low costs intensity.
12 cl, 2 tbl, 1 ex
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
SUBSTANCE: coating contains silicate binder, filler and distilled water. The silicate binder is lithium or sodium glass. The filler is a salt of an alkaline-earth element BaSO4 and a barium or lithium aluminate additive. The coating composition has application life of 3-5 weeks. The coating can be easily applied and has solar radiation absorption capacity (As)kon not greater than 0.33 when used for 15 years.
EFFECT: coating has low degree of deterioration of optical properties, low gas release, good adhesion to a substrate in outer space conditions, and electroconductive properties.
3 tbl, 3 ex
SUBSTANCE: invention relates to space materials science and optical engineering, particularly to a solar reflector class temperature-controlled coating composition meant for use in spacecraft passive thermal control systems. Said composition contains modified liquid potassium glass with silica modulus of 3.3-3.8 at density 1.204-1.216 g/cm3 as binder in amount of 26.4-28.7 wt %, pigment - zinc-gallium oxide with calculation formula ZnGaO1+n, where n=0.0064 in amount of 42.3-45.2 wt % and a solvent - distilled water in amount of 28.4-29.0 wt %. The "ЖКС"modifier used is an organic water-base copolymer based on latex.
EFFECT: composition enables to obtain solar reflector class temperature-controlled coating with high resistance to space radiation, low coefficient of absorption of solar radiation while retaining high radiation capacity, stabilising operation of communication electronics equipment and onboard systems of spacecraft, which prolongs the period for active existence of spacecraft on high orbits and reduces its weight characteristics.
SUBSTANCE: invention can be used for inkjet printing. A porphyrazine colorant or its salt is represented by formula (1), where rings A-D each independently represents a benzene ring or a 6-membered nitrogen-containing heteroaromatic ring. E represents alkylene, X represents sulfo-substituted group aniline or the like, which can additionally have a substituent, R1 represents C1-C6 alkyl group, b equals to 0.00 or more and less than 3.90, as the average value, c equals to 0.10 or more and less than 4, as the average value, and the sum of b and c equals to 1.00 or more and less than 4.00, as the average value. The composition of colorant for inkjet printing, which contains the porphyrazine colorant or its salt.
EFFECT: invention makes it possible to obtain the composition of a colorant, which has good shade, possesses excellent properties of various types of resistance, in particular, ozone resistance, provides a possibility of high density of printing, possesses properties which almost do not produce a bronze tint effect.
21 cl, 5 tbl, 17 ex
SUBSTANCE: invention relates to an ink set containing chromophoric metals for digital printing on ceramic materials. The ink set comprises liquid colouring compositions (A), (B), (C) and one from (D) and (E). The (A) comprises at least a compound of cobalt. The (B) comprises at least a compound of iron. The (C) comprises at least a compound of a metal selected from chromium, nickel and their mixtures. The (D) comprises at least a compound of cobalt and at least a compound of iron. The (E) comprises one or more compounds of zirconium. The said metal compounds decompose at a temperature of from 500 to 1300°C. When interacting with the ceramic material the metal compounds of compositions (A)-(D) form colured oxides or colured compounds. The compounds of zirconium from the composition (E) with the ceramic material form white oxides or white compounds. Also the method of decorating ceramic materials by digital printing using the specified set of ink and the decorated ceramic products produced using this method are described.
EFFECT: invention provides ceramic materials decorated with digital printing of wide range of colours with the effect of natural stone.
11 cl, 45 tbl, 5 ex