Thermally conductive polymer composite material

FIELD: physics.

SUBSTANCE: invention relates to thermally conductive dielectric materials and can be used for manufacture of heat-removing gaskets, tapes, sealants, filling compounds for computer memory chips, power electronic products, portable devices, power supplies and power converters, for which it is necessary to provide heat removal from heat-loaded elements and assemblies. A thermally conducting polymer composite material comprising a matrix based on silicone rubber or epoxy material with a filler in an amount of 0.1-80% by total weight of the thermally conductive composite material, wherein the filler is made in the form of aluminum oxide particles, the dimension of which is expressed in nanometers and micrometers, in combination with alumina nanofibers in an amount of 0.1-50% by total weight of the thermally conductive composite material and in the form of alumina nanofibers only in an amount up to 80% of the total weight of thermally conductive composite material, at that, the nanofibers are randomly arranged in the polymer matrix or oriented along the direction of heat flow from the heat-loaded surface.

EFFECT: invention provides thermally conducting composite material with high thermal conductivity.

3 ex

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to the field of protecting metals against corrosion and can be used in units of cooling systems, which are subjected to heat testing, or in engines for preliminary running before delivery to a warehouse and/or assembling a vehicle or an engine. A concentrate of a running-in liquid, providing anti-corrosion properties in liquid and vapour phases during the engine running-in, includes ammonium bicarbonate in a synergic combination with, at least one carboxylic acid, suitable for dilution with a solvent. The running-in liquid, ready for an application and providing anticorrosion properties in the liquid and vapour phases during heat testing or the engine running-in, includes ammonium bicarbonate 0.05-5.00 wt % in a synergic composition with, at least, one carboxylic acid 0.2-15.0 wt % and a solvent. The method of protecting a metal surface from corrosion includes preliminary processing of the surface with the running-in liquid mentioned above.

EFFECT: increased duration of a period of anti-corrosion protection of metal units.

15 cl, 1 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: cooling liquid concentrate contains, wt %: 1.75-2.00 of sebacic acid, 0.75-1.05 of benzoic acid, 1.25-1.5 of succinic acid, 0.02-0.065 of benzotriazole and/or tolyltriazole and/or guanazole, 1.85-2.15 of alkali metal hydroxide, 87.75-91.0 of ethyleneglycol and/or propyleneglycol and/or glycerol, 0.002-0.004 of dye and water.

EFFECT: invention provides obtaining cooling liquid concentrate, which in addition to standard characteristics possesses high anticorrosion properties with respect to each element of constructions.

3 tbl, 15 ex

FIELD: chemistry.

SUBSTANCE: invention relates to chemistry and can be used to produce heat carriers. Disclosed is a heat carrier based on organosilicon compounds. The heat carrier contains compounds based on organodisilazanes or organocyclosilazanes. The disclosed compounds are stable in a neutron current at temperature higher than 350C, which is estimated from absence of change in molecular weight of the compound after exposure to neutrons. The compounds disclosed as a heat carrier have a boiling point below 126C.

EFFECT: high efficiency of the disclosed heat carrier when used in a nuclear reactor and similar heat control systems.

5 cl, 4 tbl

Coolant // 2489467

FIELD: chemistry.

SUBSTANCE: coolant contains the following, wt %: propylene glycol - 34.80-39.90; sodium chloride 12.70-11.40 and sodium gluconate - 0.22-0.42.

EFFECT: low corrosive activity of the coolant, which impacts longevity of metal equipment.

3 ex

FIELD: chemistry.

SUBSTANCE: working medium, containing lithium bromide, lithium molybdate and lithium hydroxide, further contains an inhibiting additive in form of lithium silicate, benzotriazole and a surfactant, with the following ratio of components, wt %: lithium bromide 40-65; lithium molybdate 0.02-0.03; lithium hydroxide 0.05-0.10; lithium silicate 0.001-0.002; benzotriazole 0.5-0.65; 2-ethyl-1-hexanol 0.04-0.06; water - the balance.

EFFECT: use of the invention enables to reduce corrosive activity of the working medium on carbon and copper alloys in all phases of the working medium.

FIELD: chemistry.

SUBSTANCE: invention relates to air-conditioning and refrigeration industry. In particular, the invention relates to a coolant composition containing an azeotropic or near-azeotropic combination consisting of about 0.1-99.9 wt % Z-1,2,3,3,3-pentafluoropropene and about 99.9-0.1 E-1,2,3,3,3-pentafluoropropene. Disclosed also is a method of increasing the cooling efficiency of 1,2,3,3,3-pentafluoropropene by increasing the amount of the Z-isomer relative the amount of the E-isomer. The composition is used to cool and heat bodies which need cooling and heating. The composition is also used to produce foam, produce aerosol products, to extinguish and suppress a flame and preventing burning or explosion. The invention also relates to a composition containing said azeotropic or near-azeotropic combination and at least one compound selected from a group consisting of fluoroolefins, hydrofluorocarbons, hydrocarbons, dimethyl ether, CF3I, carbon dioxide (CO2) and ammonia.

EFFECT: compositions have high environmental friendliness and have refrigerating capacity and energy efficiency comparable to that of currently used materials.

20 cl, 3 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to polymer compositions for making fluorescent and selectively radiation-absorbing films, which transform the ultraviolet component of natural or artificial light into radiation in the red region, which can be used in agriculture to coat greenhouses and soil when growing plants. The light-correcting polymer film contains a photoluminescent phosphor and a light-stabiliser, where the photoluminescent phosphor is yttrium phosphate-vanadate-borate activated with europium and/or yttrium phosphate vanadate activated with europium, and the light stabiliser is Tinuvin 622. The composition for making a light-correcting polymer film contains yttrium phosphate-vanadate-borate activated with europium and/or yttrium phosphate-vanadate activated with europium - 1.0-5.0 wt %, Tinuvin 622 - 1.0-3.0 wt % and high-pressure polyethylene - the rest. Composition is in form of granules which are a concentrate of modifying additives in a polymer matrix.

EFFECT: longer service life of the film.

8 cl, 1 dwg, 5 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a polymer powdered composition re-dispersed in water. The powdered polymer composition re-dispersed in water contains one or more anhydrides of fatty acids in amount of 0.1-70 wt % per total weight of the powdered polymer composition. The method of preparing said powdered composition involves drying an aqueous polymer dispersion and a fatty acid anhydride or only the said anhydride in the presence of a protective colloid if necessary. Use of the said powdered composition combined with hydraulically setting binding materials in different areas of the construction industry. The invention is developed in subclaims.

EFFECT: enhancement of hydrophobic properties.

10 cl, 6 ex, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to liquid compositions used to prepare abrasive slurries for loose abrasive mechanical processing. The composition contains 40-50 vol % polyethylene glycol and 50-60 vol. % water. The composition can contain a viscosity modifier which provides viscosity ranging from 40 to 100 cP, and a viscosity activator selected from triethanolamine and aminoborate. The invention also discloses a method of preparing a liquid composition for use in back-and-forth cutting with a wire saw. The liquid composition is obtained by mixing components of the composition. Abrasive particles selected from silicon carbide, diamond and boron carbide are uniformly dispersed inside the composition. A working slurry with concentration of the solid phase equal to 20-28% of the volume of the composition is obtained. Water is added to the working slurry in order to change viscosity to the one required for cutting.

EFFECT: invention enables to obtain low-viscosity abrasive slurries which prevent settling down of the solid phase and reduce destruction of plates when cutting with a wire saw.

20 cl, 1 tbl, 2 dwg, 3 ex

FIELD: wood working industry.

SUBSTANCE: method for heat recuperation in grinding of wood pulp includes ejection of pressurised wood pulp from high-pressure refining machine; introduction of at least filtrate from pressurised wood pulp into pressurised expansion cyclone; transfer of heat from expansion cyclone to water for its heating, and usage of heated water in process of wood pulp grinding. Meanwhile wood pulp is a pressurised suspension of fibres in liquid, besides, wood pulp suspension is pressurised with 3 to 6 bar. Pressurised wood pulp is a suspension of low or medium concentration and has the temperature of not lower than 140C in the refining machine. Expansion cyclone maintains pressure in wood pulp at the level of 3-6 bar. Heat exchanger is additionally used for heat transfer. Wood pulp is ground in pulp mill, and a separate flow from pressurised expansion cyclone is used in a separate process at pulp mill.

EFFECT: increased power consumption in process of production of mechanical wood pulp.

12 cl, 3 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to silicon composite materials. A method of improving adhesion to metals of silicon composite materials includes obtaining by a polyaddition reaction of a composite material, containing polydimethylsiloxane with terminal vinyl groups of the general formula (CH2=CH)(CH3)2Si-[O-Si(CH3)2-]nO-Si(CH3)2(CH=CH2), where n=12801300, a weight part of vinyl groups constitutes 0.080.095 wt %, dynamic viscosity is 5400055000 cp; a silicone resin of the general formula {[(CH3)3SiO1/2]x[SiO2]1[(CH3)2SiO]y[CH3VinSiO]z}, where x=0.91.2, y=00/4, z=0.10.4; halloysite and a filling agent. As the filling agent used is aluminium oxide, metallised with iron.

EFFECT: invention ensures obtaining the heat resistant silicone composite material, possessing higher adhesion to metal at a temperature of 500C.

6 ex

FIELD: chemistry.

SUBSTANCE: disclosed is a respirator, having a laminate capable of reversible adhesion to human skin, having a substrate; an organosilicon mixture attached to the substrate; and an organosilicon adhesive film attached to the organosilicon mixture. The organosilicon mixture is essentially homogeneous and contains a hot-melt organosilicon adhesive with high adhesive power such as Bio-PSA-7-4560, which is solid at room temperature, and a low adhesive power organosilicon adhesive such as Bio-PSA-7-4101, which is a liquid low adhesive power organosilicon material. Also disclosed is a version of the respirator and method of making said respirator.

EFFECT: enabling reversible adhesion of the article to the skin of the user and reliable bonding of the base of the article and the organosilicon mixture.

9 cl, 3 tbl, 6 ex

FIELD: organic chemistry, polymers, chemical technology.

SUBSTANCE: invention relates to a composition used for cross-linking and stabilizing a polymer containing hydrolysable silane groups wherein this composition comprises sulfonic acid as a catalyst for condensation of silanols. Invention describes using the composition comprising sulfonic acid as a catalyst for condensation of silanols wherein sulfonic acid represents a compound of the formula (III): ArSO3H (III) or its precursor wherein Ar means hydrocarbyl-substituted aryl group, and compound comprises in total from 14 to 28 carbon atoms and wherein a compound used as a stabilizing agent represents neutral or acidic compound, it doesn't comprise ester groups and represents compound described by the formula (I):

wherein R means unsubstituted or substituted aliphatic or aromatic hydrocarbyl radical that can comprise heteroatoms; R' means hydrocarbyl radical; R'' means hydrocarbyl radical, and R' and/or R'' mean a bulky radical; X1, X2 and X3 are similar or different and represent hydrogen atom (H) of hydroxyl group (-OH) wherein at least X1, X2 or X3 mean -OH; n is in the range from 1 to 4. The composition is used for cross-linking and stabilizing a polymer comprising hydrolysable silane groups. Invention provides enhancing resistance of polymer against aging, absence of mercaptan or other odor and formation of cracks in material.

EFFECT: valuable properties of composition.

24 cl, 4 tbl

FIELD: aeronautical engineering and rocketry; manufacture of rocket antenna domes and radioparent ports; manufacture of articles resistant to stable heating up to 800°C.

SUBSTANCE: proposed method includes impregnation of multi-layer glass fabric with organic binder, molding and hardening of binder; after hardening of binder, it is subjected to heat treatment at temperature of 250-350°C continued for 1-2 h and followed by holding in acetone for 1-2 h and impregnation with silicon organic resin and polymerization at temperature of 250-350°C for 3-4 h. Proposed method enhances heat stability of articles made from glass-reinforced plastics working under conditions of one-sided intensive heating up to 800°C at retained strength properties and dielectric characteristics.

EFFECT: enhanced efficiency; retained high strength properties and dielectric characteristics.

1 tbl, 12 ex

The invention relates to medicine, namely to prosthetics and protestosterone

The invention relates to curing the siloxane mixtures for cold-curing rubbers used as coating, impregnating compositions and binders

FIELD: chemistry.

SUBSTANCE: first step includes obtaining low-hydroxylated insoluble fullerenols by reacting concentrated fullerene solution in o-xylene with aqueous ammonia solution in the presence of a tetrabutylammonium hydroxide phase-transfer catalyst at 35-40C. At the second step, the obtained low-hydroxylated insoluble fullerenols are hydroxylated to transform them into a water-soluble form by mixing with 6-15% aqueous hydrogen peroxide solution and heating for 4-5 hours at 65C. Water-soluble fullerenols are then precipitated from an alcohol-containing solution.

EFFECT: simplifying the method while preserving quality characteristics and full extraction of the end product.

2 cl, 1 dwg, 4 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to nanotechnology, particularly a method of producing aspirin nanocapsules in a carrageenan envelope. The disclosed method includes preparing an aspirin suspension in benzene; dispersing the obtained mixture into a carrageenan suspension in butanol in the presence of an E472c preparation while mixing at 1000 rps; adding tetrachloromethane; filtering the obtained nanocapsule suspension and drying at room temperature.

EFFECT: method provides a simpler and faster process of producing nanocapsules and increases mass output.

1 dwg, 4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to encapsulation, particularly to a method of producing albendazole nanocapsules in a sodium alginate envelope. The disclosed method includes adding albendazole to a sodium alginate suspension in hexane in the presence of an E472c preparation while mixing at 1000 rps. The weight ratio of albendazole and sodium alginate is 1:3 or 3:1. Further, 1,2-dichloroethane is added. The obtained suspension of nanocapsules is filtered, washed and dried. The process of producing the nanocapsules is carried out at 25C for 20 minutes.

EFFECT: invention provides a simpler and faster process of producing nanocapsules, reduces losses during production thereof (high mass output).

3 ex, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to encapsulation, particularly a method of producing resveratrol nanocapsules in an envelope made of low- or highly esterified apple or citrus pectin. According to the disclosed method, resveratrol is dispersed in a suspension of low- or highly esterified apple or citrus pectin in benzene in the presence of an E472c preparation while stirring at 1000 rps. Tetrachloromethane is then added. The obtained suspension of nanocapsules is filtered and dried. The process of producing the nanocapsules is carried out at 25C for 10 minutes.

EFFECT: invention provides a simpler and faster process of producing nanocapsules, reduces losses during production thereof (high mass output).

9 ex, 1 dwg

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