Abstract

Disclosed are a two-component organosilicon potting sealant and an application method therefor. The sealant comprises a component A and a component B, the component A comprising a hyperbranched organosilicon resin having a siloxane terminal group, a vinyl MQ resin and a first thermally conductive material, and the component B comprising a hydrogen-containing silicone oil, a silane coupling agent and a second thermally conductive material. The hyperbranched organosilicon resin having the siloxane terminal group is made from a methyl ethyl vinyl siloxane and dimethylallylsiloxane reaction having a feed molar ratio of 0.5-2:1. In the application method: when used, the component A and the component B are weighed out according to the formula quantities, are mixed and blended evenly, are then poured onto a device to be potted and protected, and undergo a reaction for curing. The present two-component organosilicon potting sealant not only is capable of ensuring that the organosilicon potting sealant has high thermal conductivity and lasting insulation, but also prevents particles from settling during use or storage, and allows the potting sealant to have consistent and stable quality between batches while still being resistant to high and low temperatures and having outstanding mechanical properties etc.

IPC Classes  ?

• C09J 183/07 - Polysiloxanes containing silicon bound to unsaturated aliphatic groups
• C09J 183/05 - Polysiloxanes containing silicon bound to hydrogen
• C09J 11/04 - Non-macromolecular additives inorganic
• C09J 11/06 - Non-macromolecular additives organic
• C09K 5/14 - Solid materials, e.g. powdery or granular

Abstract

Disclosed is a dispersion reactor. The dispersion reactor comprises a reactor cylinder (1) and a stirring device partially arranged inside the reactor cylinder (1), wherein the reactor cylinder (1) comprises a reactor body (11), and a reactor cover (12) detachably connected to the reactor body (11) and used for covering the reactor body (11), and a portion of the stirring device penetrates the reactor cover (12) and extends into the reactor body (11); and the dispersion reactor further comprises an ultrasonic vibration device, wherein the ultrasonic vibration device comprises an ultrasonic generator (31) arranged on the reactor cover (12), an ultrasonic transducer connected to the ultrasonic generator (31), an amplitude-transforming pole connected to the ultrasonic transducer, and an ultrasonic vibration rod (32) connected to the amplitude-transforming pole, and the ultrasonic vibration rod (32) extends into the reactor body (11).

IPC Classes  ?

• B01J 19/18 - Stationary reactors having moving elements inside
• B01F 11/02 - Mixing by means of ultrasonic vibrations
• B01F 7/16 - Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a vertical axis

Abstract

An inorganic powder modification system, comprising a premixing device (A), a grinding device (B), a dispersion reactor (C), and a filtering device (D) which are communicated in sequence. The dispersion reactor (C) comprises a reactor cylinder (1), a stirring device, and an ultrasonic vibration device, the reactor cylinder (1) comprises a reactor body (11) and a reactor cover (12), and the stirring device partially penetrates through the reactor cover (12) and extends into the reactor body (11); the ultrasonic vibration device comprises an ultrasonic generator (31) arranged on the reactor cover (12), an ultrasonic transducer connected to the ultrasonic generator (31), a horn connected to the ultrasonic transducer, and an ultrasonic vibration rod (32) connected to the horn, and the ultrasonic vibration rod (32) extends into the reactor body (11).

IPC Classes  ?

• B01F 7/18 - Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a vertical axis with paddles or arms
• B01F 13/10 - Mixing plant, including combinations of dissimilar mixers
• B02C 21/00 - Disintegrating plant with or without drying of the material
• B01J 19/18 - Stationary reactors having moving elements inside

Abstract

Disclosed are a self-emulsifying epoxy resin emulsion, a preparation method therefor and an application thereof. The raw materials of the emulsion comprise 100-150 parts epoxy resin, 10-20 parts sorbitan polyoxyethylene ether fatty acid ester, 10-20 parts fatty alcohol polyether phosphate, 1-5 parts of an amine accelerator, and 100-10000 parts water. The feeding mass ratios of the epoxy resin to the sorbitan polyoxyethylene ether fatty acid ester and the fatty alcohol polyether phosphate are 1:0.075-0.18 and 1:0.07-0.2, respectively. The preparation thereof comprises: the epoxy resin undergoes a first reaction with the sorbitan polyoxyethylene ether fatty acid ester in the presence of the amine accelerator, then undergoes a second reaction with the fatty alcohol polyether phosphate, and is then mixed with water and is made; and an application thereof in epoxy coatings. In the present invention, a uniform and stable emulsion may be self-emulsified without adding a co-solvent. The emulsion has a long storage period, no VOC emissions, and has excellent film toughness and rust resistance after film formation.

IPC Classes  ?

• C09D 163/00 - Coating compositions based on epoxy resinsCoating compositions based on derivatives of epoxy resins
• C09D 5/08 - Anti-corrosive paints
• C09D 7/65 - Additives macromolecular
• C09D 7/63 - Additives non-macromolecular organic

Abstract

Disclosed are a thermally conductive insulating paint and a preparation method therefor. The thermally conductive insulating paint comprises the following raw materials: polyol, acid anhydride, modified carbon nanotubes, a crosslinking monomer and an initiator. The modified carbon nanotubes are prepared by means of the following method: 1) preparing surface carboxylated carbon nanotubes; and 2) dissolving the surface carboxylated carbon nanotubes in a mixed solution of water and ethanol, and adding ethyl orthosilicate, vinyl triethoxy silane and ammonia water for a reaction to obtain the modified carbon nanotubes, the modified carbon nanotubes having a vinyl group on the surface thereof. The preparation method is as follows: the polyol and the acid anhydride are mixed and then react in stages at different temperatures in the presence of a protective gas, and then the remaining raw materials are added, mixed and react to prepare, wherein the modified carbon nanotubes may be added together with the acid anhydride or comprised in the remaining raw materials. The present invention has high thermal conductivity and insulation properties while also having excellent mechanical properties.

IPC Classes  ?

• C09D 167/06 - Unsaturated polyesters having carbon-to-carbon unsaturation
• C09D 5/25 - Electrically-insulating paints or lacquers

Abstract

Disclosed in the present invention are a preparation method for a modified carbon nanotube and use thereof, the preparation method comprising: (1) preparing a surface-carboxylated carbon nanotube; and (2) dissolving the surface-carboxylated carbon nanotube in a mixed solution of water and ethanol, then adding tetraethoxysilane, vinyltriethoxysilane and aqueous ammonia, reacting same to prepare the modified carbon nanotube, the surface of the modified carbon nanotube having a vinyl group. Further disclosed is use of the modified carbon nanotube prepared by the preparation method in a thermally conductive and insulating material. The modified carbon nanotube prepared by the preparation method of the present invention can have the characteristics of high thermal conductivity, low electrical conductivity, and good compatibility with organics; and is thus especially suitable for a thermally conductive and insulating paint.

IPC Classes  ?

• C01B 32/168 - After-treatment
• C09D 5/25 - Electrically-insulating paints or lacquers

Abstract

Disclosed are an insulating impregnating varnish and a preparation method thereof. The insulating impregnating varnish comprises a matrix resin, a diluent and a curing agent, wherein the matrix resin is prepased by condensation of a modified epoxy resin with an organic silanol having a Si-OH group, the raw materials of the modified epoxy resin comprise an epoxy resin, a vinyl monomer containing an ester groupand a hydrophobic hexagonal boron nitride nanosheet containing a vinyl group, and the modified epoxy resin is prepared by polymerization of the epoxy resin with the remaining raw materials, and the boron nitride nanosheet is prepared by a specific method comprising: treaing by surface hydroxyl modification and freeze-thaw expansion, performing in one-pot method boron nitride stripping and catalytic esterification modification by binding with a specific compound. The insulating impregnating varnish is prepared by mixing and stirring the matrix resin, the diluent and the curing agent. The insulating impregnating varnish has the advantages of not only high thermal conductivity coefficient, low dielectric loss, high and low temperature impact resistance, good bonding strength, good permeability, high electric field strength and high mechanical strength, but also stable product quality between batches during preparation.

IPC Classes  ?

• C09D 151/08 - Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bondsCoating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
• C09D 151/10 - Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bondsCoating compositions based on derivatives of such polymers grafted on to inorganic materials
• C09D 5/25 - Electrically-insulating paints or lacquers
• C08F 283/10 - Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass on to polymers containing more than one epoxy radical per molecule
• C08F 292/00 - Macromolecular compounds obtained by polymerising monomers on to inorganic materials

Abstract

Disclosed are a modified epoxy resin and a preparation method therefor. Raw materials comprise an epoxy resin, an ester-containing vinyl monomer, and a vinyl-containing hydrophobic hexagonal boron nitride nanosheet; the modified epoxy resin is prepared from the epoxy resin undergoing a polymerization reaction with the other raw materials. For the preparation of the vinyl-containing hydrophobic hexagonal boron nitride nanosheet: a surface hydroxyl modification and a freeze-thaw expansion treatment are employed, and then, combined with a specific compound of formula (I) in a one-pot synthesis, the stripping of boron nitride and the catalysis of an esterification modification are performed. The preparation method: a) preparing the vinyl-containing hydrophobic hexagonal boron nitride nanosheet; and b) allowing the epoxy resin, the vinyl-containing hydrophobic hexagonal boron nitride nanosheet prepared in step a), and the other raw materials to undergo the polymerization reaction under the presence of an initiator in a third solution, thus generating the modified epoxy resin. The modified epoxy resin of the present application has the advantages of high thermal conductivity, low dielectric loss, high electric field strength, increased mechanical strength, and additionally stable product quality between batches during preparation.

IPC Classes  ?

• C08F 283/10 - Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass on to polymers containing more than one epoxy radical per molecule
• C08F 220/14 - Methyl esters
• C08F 220/18 - Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
• C08F 230/06 - Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal containing a metal containing boron

Abstract

Disclosed is a water-based insulating varnish for a transformer, a preparation method thereof, and an application thereof in dipping a transformer. Raw materials of the insulating varnish comprise polyol, acid anhydride, a neutralizing agent, a co-solvent, a water-based curing agent, water, diisocyanate and a chain extender. The polyol is composed of glycerol and neopentyl glycol. The acid anhydride is composed of phthalic anhydride and trimellitic anhydride. By means of mixing glycerol, neopentyl glycol, phthalic anhydride and trimellitic anhydride and causing a polycondensation reaction, a hydroxyl-terminated hyperbranched polyester is prepared. The hydroxyl-terminated hyperbranched polyester is reacted with diisocyanate, and then the neutralizing agent, the co-solvent, the chain extender and water are added and reacted. The water-based curing agent is then added and mixed to obtain the insulating varnish. The insulating varnish can prevent the transformer dipped with the water-based insulating varnish from being subjected to a secondary soldering at a high temperature of about 400°C, and can impart thereto soldering and conductive characteristics at an operating temperature of a plug-in circuit board, and can be further applied to a plug-in circuit board, streamlining process steps and saving energy.

IPC Classes  ?

• C09D 175/06 - Polyurethanes from polyesters
• C09D 5/25 - Electrically-insulating paints or lacquers
• C08G 63/20 - Polyesters having been prepared in the presence of compounds having one reactive group or more than two reactive groups
• C08G 18/72 - Polyisocyanates or polyisothiocyanates

Abstract

A nano-silica hybrid vinyl phenyl silicon intermediate, a preparation method therefor and a use thereof in an environmentally-friendly insulating varnish are provided. The nano-silica particles are dispersed uniformly and stably; the nana-silica hybrid vinyl phenyl silicon intermediate has the advantages of resisting high temperatures and coronas and being high in activity; the temperature index measured according to a secant method is 200° C.-240° C., the measured corona-resistant time is 18-36h, and the vinyl active sites carried thereon can have a good compatibility with polyesterimide, heat-resistant polyesters, hydrogen-containing siloxane and modified epoxy; the intermediate is particularly suitable for preparing a high-temperature-resistant and corona-resistant solvent-free insulating varnish; and there are on volatile gases during use, thereby causing on pollution to the atmospheric environment.

IPC Classes  ?

• C08G 77/06 - Preparatory processes
• C08G 77/20 - Polysiloxanes containing silicon bound to unsaturated aliphatic groups
• C08G 77/44 - Block- or graft-polymers containing polysiloxane sequences containing only polysiloxane sequences
• C09D 183/10 - Block or graft copolymers containing polysiloxane sequences
• C09D 183/04 - Polysiloxanes

Abstract

The present invention relates to a high-temperature resistant modified silicon-containing cyanate ester resin as well as a preparation method and an application thereof. The preparation method comprises the following steps: adding a mixed solution of hydroxyl silicone oil, a silane coupling agent and an organic solvent into a mixed solution of a tetramethylammonium hydroxide aqueous solution and a polar solvent, performing hydrolytic polycondensation at a temperature of 5-40° C. for 4-8 h, and performing distillation to obtain an epoxy-containing silsesquioxane; performing pre-polymerization on the epoxy-containing silsesquioxane and a cyanate ester resin at a temperature of 50-100° C. for 1-8 h to obtain a modified cyanate ester resin; and uniformly mixing the modified cyanate ester resin and a modified anhydride, thereby obtaining the high-temperature resistant modified silicon-containing cyanate ester resin.

IPC Classes  ?

• C08G 77/14 - Polysiloxanes containing silicon bound to oxygen-containing groups
• C08G 73/06 - Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromoleculePolyhydrazidesPolyamide acids or similar polyimide precursors
• C08L 83/06 - Polysiloxanes containing silicon bound to oxygen-containing groups
• C08G 81/02 - Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers at least one of the polymers being obtained by reactions involving only carbon-to-carbon unsaturated bonds
• C08G 59/32 - Epoxy compounds containing three or more epoxy groups
• C08G 77/452 - Block- or graft-polymers containing polysiloxane sequences containing nitrogen-containing sequences
• C08K 3/04 - Carbon

Goods & Services

Insulating coatings; insulating materials; insulating paints; insulators; insulating oils; insulating fabrics; insulating tape and insulation tape; mica, raw or partly processed; insulating mica tape; fiberglass fabrics for insulation; insulating paper.

Goods & Services

Insulating materials; insulating tape and insulation tape; fiberglass fabrics for insulation; mica, raw or partly processed; insulating paints; insulating varnish; insulating coatings; insulators.

Abstract

The present invention relates to a polyoxazolidinone resin, a preparation method thereof and a use thereof in an impregnating varnish. The polyoxazolidinone resin is prepared by reacting an alicyclic epoxy resin and a diisocyanate in the presence of a catalyst at 150ºC to 170ºC for 3 to 5 hours, wherein the molar ratio of the isocyanate radical in the diisocyanate to the epoxy radical in the alicyclic epoxy resin is 1:1.8 to 2.3. The impregnating varnish of the present invention uses the polyoxazolidinone resin as a bulk material in combination with acrylated epoxy resin and alicyclic epoxy resin, such that the impregnating varnish has the advantages of being heat resistant and flame retardant, low in cost, and eco-friendly, and finds use in insulation treatment of high-voltage and low-voltage electric machinery.

IPC Classes  ?

• C08G 73/06 - Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromoleculePolyhydrazidesPolyamide acids or similar polyimide precursors
• C08G 18/00 - Polymeric products of isocyanates or isothiocyanates
• C08G 59/02 - Polycondensates containing more than one epoxy group per molecule
• C09D 179/04 - Polycondensates having nitrogen-containing heterocyclic rings in the main chainPolyhydrazidesPolyamide acids or similar polyimide precursors
• C09D 163/00 - Coating compositions based on epoxy resinsCoating compositions based on derivatives of epoxy resins

Abstract

A nano-silica hybrid vinyl phenyl silicon intermediate, a preparation method therefor and a use thereof in an environmentally-friendly insulating paint. The nano-silica particles are dispersed uniformly and stably; the nano-silica hybrid vinyl phenyl silicon intermediate has the advantages of resisting high temperatures and coronas and being high in activity; the temperature index measured according to a secant method is 200ºC - 240ºC, the measured corona-resistant time is 18 - 36 h, and the vinyl active sites carried thereon can have a good compatibility with polyesterimide, heat-resistant polyesters, hydrogen-containing siloxane and modified epoxy; the intermediate is particularly suitable for preparing a high-temperature-resistant and corona-resistant solvent-free insulating paint; and there are no volatile gases during use, thereby causing no pollution to the atmospheric environment. The method for preparing the nano-silica hybrid vinyl phenyl silicon intermediate is simple, the reaction temperature is low, and the viscosity of the product and the content of the nano-silica can be controlled by controlling the amounts of a catalyst and a molecular weight modifier and the reaction temperature, thereby enabling the applicability of the product to be wider.

IPC Classes  ?

• C08G 77/20 - Polysiloxanes containing silicon bound to unsaturated aliphatic groups
• C09D 183/07 - Polysiloxanes containing silicon bound to unsaturated aliphatic groups

Abstract

Provided are a high-temperature resistant modified silicon-containing cyanate ester resin and a preparation method and a use thereof. The method comprises the following steps: adding a mixed solution of a hydroxy silicone oil, a silane coupling agent and an organic solvent to a mixed solution of a tetramethylammonium hydroxide aqueous solution and a polar solvent, performing hydrolysis and condensation at a temperature of 5-40˚C for 4-8 h, and performing distillation to obtain an epoxy-containing silsesquioxane; performing prepolymerization on the epoxy-containing silsesquioxane and a cyanate ester resin at a temperature of 50-100˚C for 1-8 h to obtain a modified cyanate ester resin; and evenly mixing the modified cyanate ester resin with a modified acid anhydride to obtain a high-temperature resistant modified silicon-containing cyanate ester resin. Intrinsic toughening is used to reduce the brittleness of a cyanate ester resin without sacrificing the heat resistance thereof, so that a high-temperature resistant resin composition having a transition temperature (Tg) of 240-270˚C can be prepared by a pultrusion process. The resin composition exhibits excellent heat resistance and has significantly reduced costs.

IPC Classes  ?

• C08G 73/06 - Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromoleculePolyhydrazidesPolyamide acids or similar polyimide precursors