1432 results about "Cyanate ester" patented technology

The invention relates to the technical field of layered composite fabrics, in particular to an antibacterial breathable bio-based composite fabric and a preparation method thereof. The composite fabric comprises a two-layer structure of an inner-layer fabric and an outer-layer fabric, the inner-layer fabric is prepared from a bio-based material polylactic acid, the outer-layer fabric is prepared from bio-based materials polyamide fibers and polyester fibers, the polylactic acid is subjected to modification treatment, graphene oxide is introduced, quaternary ammonium salt is generated, the composite fabric has excellent antibacterial performance, and the antibacterial performance of the composite fabric is improved. The preparation method of the antibacterial modified polylactic acid comprises the following steps: reacting graphene oxide with 1-dimethoxy (methyl) silicon methyl isocyanate to prepare isocyanate-based graphene oxide; reacting the isocyanate-based graphene oxide with polylactic acid to prepare graphene oxide modified polylactic acid; reacting the graphene oxide modified polylactic acid with epoxidized soybean oil and amino modified graphene oxide to prepare modified polylactic acid; and carrying out quaternization reaction on the modified polylactic acid and bromoethanol to generate the antibacterial modified polylactic acid.

The invention relates to the field of polyurethane coating processing, in particular to a waterproof bio-based polyurethane coating and a preparation technology thereof.The waterproof bio-based polyurethane coating is prepared from, by weight, 25%-40% of castor oil polyester polyol, 15%-25% of isocyanate, 5%-10% of bio-based polybasic acid, 0.2%-0.6% of a catalyst, 0.5%-1% of a chain extender, 15%-20% of modified nanofiller, 3%-5% of a wetting agent and 1%-2% of a curing agent. By adopting the formula, the prepared waterproof bio-based polyurethane coating has good weather resistance, high and low temperature resistance, strength and waterproofness, and can be used in Tibet, Xinjiang, Inner Mongolia, Qinghai and other regions for a long time without aging, and the service life of the waterproof coating is prolonged.

The invention relates to a flexible aqueous binder for a lithium battery negative electrode and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing a flexible polyurethane prepolymer containing vinyl by taking hydroxyl-terminated polybutadiene, isocyanate and hydroxyl acrylate as main raw materials; vinyl-containing compounds such as water-soluble acrylic acid (salt) or acrylamide, oil-soluble acrylic ester or acrylonitrile and the like are used as monomers and are combined with a flexible polyurethane prepolymer to prepare the negative water-based binder with flexible cross-linking points through free radical polymerization. The aqueous binder prepared by the technical method provided by the invention can realize point-to-point and point-to-line bonding modes with a pole piece active substance on a microstructure, so that the bonding strength of the active layer material and a copper foil is improved on the premise of not influencing the electrolyte resistance of the binder; and the flexibility of the negative pole piece and the subsequent processing stability are obviously improved.

The invention discloses a double self-repairing polyurethane coating containing a metal coordination bond and a Diels-Alder bond. The double self-repairing polyurethane coating is prepared from the following raw materials: polyol, an isocyanate derivative, a chain extender containing the metal coordination bond, metal salt and a binary chain extender containing the Diels-Alder bond. According to the double self-repairing polyurethane coating containing the metal coordination bond and the Diels-Alder bond, the repairing efficiency and the mechanical and chemical resistance can be improved.

The invention relates to the field of optical protection materials, and provides a transparent film with laser eavesdropping prevention performance and a preparation method thereof.The transparent film is composed of surface-modified doped tungsten oxide nanosheets, amino-isocyanate bifunctional lithium niobate nanowires, urethane acrylate, an ultraviolet light absorber, a silane coupling agent, a dispersing agent and a flatting agent; the molybdenum-doped tungsten oxide nanosheets are obtained through silane coupling modification after hydrothermal synthesis, and the lithium niobate nanowires are prepared through a gradient modification process of hydrothermal synthesis-silane coupling-isocyanate grafting-phenol end capping. A modified nano material is uniformly dispersed in a resin matrix through an ultrasonic dispersion composite technology, and through blade coating forming, ultraviolet curing and constant-temperature and constant-humidity post-treatment, compared with the prior art, the scheme overcomes the problems that a traditional protective film is insufficient in optical transparency, laser eavesdropping prevention function and dynamic viscoelasticity, and is suitable for the field of high-end security and protection.

The invention belongs to the technical field of sealants, and particularly relates to acrylate modified MS resin as well as a preparation method and application thereof in an MS sealant. The acrylate modified MS resin disclosed by the invention has the following structural formula: # imgabs0 #. The preparation method of the acrylate modified MS resin comprises the following steps: (1) mixing diisocyanate and acrylate for reaction to obtain a prepolymer; and (2) mixing polyether polyol, isocyanate silane, the prepolymer and a catalyst for reaction to obtain the acrylate modified MS resin. The prepared acrylate modified MS resin is used for preparing an MS sealant. The preparation method of the acrylate modified MS resin provided by the invention is simple in process, mild in reaction condition and convenient in production conversion, and the prepared acrylate modified MS resin is applied to an MS sealant, so that the base material adhesive force, weather resistance and mechanical properties of the MS sealant are improved.

The invention relates to the technical field of three-proofing paints, in particular to a UV moisture dual-curing three-proofing paint and a preparation method thereof. The conformal coating is prepared from the following raw materials in parts by weight: 10-80 parts of acrylate resin; 20 to 60 parts of a UV reactive diluent; 3-15 parts of a polyurethane latent curing agent; 1 to 10 parts of a photoinitiator; 1-5 parts of a dewatering agent; the acrylic resin comprises at least one of urethane acrylate and isocyanate modified acrylate. According to the invention, when the specific curing agent is selected, especially the oxazolidine latent curing agent or imine latent curing agent containing at least two oxazolidinyl groups is adopted, the curing time of the conformal coating in a dark environment can be greatly shortened, and meanwhile, the problems of bubbles, pinholes and the like caused by moisture in the curing process of the conformal coating can be effectively solved; good market application values are realized.

The invention discloses a dicyclohexylmethane diisocyanate composition and a thermoplastic polyurethane elastomer. The content of an isomer 2, 4 '-dicyclohexylmethane diisocyanate (2, 4'-HMDI) in the dicyclohexylmethane dicyanic acid ester composition (HMDI) is less than 2% wt, and the F value range of the HMDI composition is 0.23-0.64. The thermoplastic polyurethane elastomer prepared from the dicyclohexylmethane diisocyanate composition provided by the invention has extremely high light transmittance and extremely high tensile strength.

The invention discloses a silane cross-linked polyolefin halogen-free flame-retardant cable material and a low-energy-consumption preparation method thereof.The preparation method comprises the steps that EVA / EEA serves as a matrix, silane groups are covalently connected to a polyolefin molecular chain through a free radical grafting reaction, and a grafting material containing an active silane side group is prepared; meanwhile, vinyl isocyanate is adopted to chemically modify hydroxyl on the surface of magnesium hydroxide, vinyl is grafted to the surfaces of particles, the polarity of the particles is reduced, and the dispersity of the particles is enhanced; then carrying out melt blending on the grafted material and modified magnesium hydroxide, constructing an interface bridge by using an anhydride group, and shortening the two-phase distance; finally, through room-temperature natural cross-linking and warm water auxiliary cross-linking, silane groups are promoted to be hydrolyzed into silanol, the silanol is condensed to form a-Si-O-Si-three-dimensional network, meanwhile, vinyl on the surface of magnesium hydroxide and a polyolefin matrix are subjected to free radical copolymerization, and a covalent bond interface layer is formed between inorganic particles and an organic matrix. According to the method, the synergistic improvement of high crosslinking degree, strong stretchability and excellent flame retardance of the cable material is realized through molecular-level interface regulation and cross-linking network optimization.

The present invention relates to a preparation method of a flame-retardant, high-refractive-index, melt-drop resistant waterborne polyurethane coating. A diol, an isocyanate and dibutyltin dilaurate are added to a 500 mL flask, and the temperature is raised to 70-85 °C, and the mixture is stirred and reacted for 1-2 h to obtain a polyurethane prepolymer; then a charring agent is added to the polyurethane prepolymer, and the reaction is continued for 1-2 h; the temperature is lowered to 60 °C, and then 2,2-dimethylolbutyric acid and amino carbon nanotubes are added and reacted for 0.5-1 h; then a high-refractive-index material is added, and the reaction is carried out at 65-70 °C for 1-2 h, the temperature is lowered to 40 °C, and then triethylamine is added and reacted for 0.5-1 h; deionized water is added, and at a rotation speed of 2000 r / min, an ammonium polyphosphate solution is added, and high-speed shear emulsification is carried out for 0.5-1 h to obtain a flame-retardant, high-refractive-index, melt-drop resistant waterborne polyurethane coating. This polyurethane coating has high flame retardancy, high refractive index and no melt-dropping property.

The invention discloses a preparation method of a flame-retardant, light-emitting and recoverable transparent polyurethane material, which comprises the following steps: reacting triethanolamine with diphenylphosphonyl chloride to obtain a light-emitting flame retardant, and polymerizing the light-emitting flame retardant with polyether polyol, isocyanate and a chain extender to obtain the flame-retardant, light-emitting and recoverable transparent polyurethane material, the preparation method is simple, the process is easy to control, the prepared transparent polyurethane material can keep high tensile strength, the limit oxygen index can reach 30.3, the UL-94 grade reaches the V-0 grade, and the flame retardant effect is good; in addition, due to high transparency and fluorescence, the compound can be used as a light conversion film to be applied to a flexible solar cell, so that the photoelectric conversion efficiency of the flexible solar cell is improved.

The invention relates to the technical field of novel energy materials, in particular to a photo-thermal driving shape memory type heat storage and temperature regulation phase change material and a preparation method and application thereof, and the photo-thermal driving shape memory type heat storage and temperature regulation phase change material comprises a polyurethane phase change material and a photo-thermal conversion material; the polyurethane phase change material is prepared from polyether type polyol, polyester type polyol, isocyanate and small molecule polyol; wherein the molar ratio of the polyether type polyol to the polyester type polyol is 1: (1 to 1000), and the molecular weight of the polyether type polyol is 10000 to 900000; the photothermal conversion material comprises one or more of carbon-based materials such as graphene, graphene oxide and a carbon nano tube. The phase change material has the advantages of high enthalpy value, high strength, photothermal conversion performance, good flexibility and reversible shape memorability, simple preparation method and low cost, and can be widely used in the fields of artificial muscle fibers, heat storage and temperature regulation intelligent textiles, heat management and the like.

The invention relates to the field of copper-clad plates, and discloses a low-dielectric-constant high-performance copper-clad plate and a preparation method thereof.The preparation method comprises the specific steps that epoxy resin, phenolic resin, polyphenyl ether modified resin, modified nano silicon dioxide and the like are taken and mixed to obtain a resin glue solution; impregnating glass fabric in the resin glue solution to obtain a prepreg; laminating prepregs, and covering copper foil for hot pressing; the polyphenyl ether modified resin comprises epoxy resin, diallyl cyanate and fluorine-containing polyphenyl ether resin prepared by reaction of polyphenyl ether, bisphenol AF and benzoyl peroxide; the modified nano silicon dioxide is prepared by reacting allyl glycidyl ether, vinyltriethoxysilane and phenyltris (dimethylsiloxane) silane, then grafting with a phosphorus-containing intermediate to prepare a modified additive, and grafting with nano silicon dioxide, and the phosphorus-containing intermediate is prepared by reacting phenylphosphoryl dichloride and eugenol. The copper-clad plate with high flame retardance, high peel strength, heat resistance and low dielectric constant is prepared.

The invention relates to a preparation method of a high-response miniature supercapacitor based on high-conductivity graphene, and the method comprises the steps: providing a substrate, and carrying out the surface modification of the substrate; preparing a cyanate ester film on the substrate; irradiating the cyanate ester film through a large-size light spot laser beam, and inducing the cyanate ester film to form a high-conductivity graphene film; engraving the high-conductivity graphene film through a small-size light spot laser beam to obtain a high-resolution interdigital electrode; the pins of the high-resolution interdigital electrodes are led out through conductive silver paste and copper foil, and the high-resolution interdigital electrodes with the pins led out are cleaned and dried; uniformly coating the dried high-resolution interdigital electrode with a gel electrolyte, and carrying out vacuum pumping treatment on the high-resolution interdigital electrode; and packaging the vacuumized high-resolution interdigital electrode by using a packaging film to obtain the high-response micro supercapacitor. According to the invention, the graphene film with high conductivity is prepared, so that the high-response micro supercapacitor is manufactured, and the manufacturing cost is low.

The invention relates to a preparation method of a flame-retardant, high-refraction and melt-drop-resistant water-based polyurethane coating, which comprises the following steps: adding dihydric alcohol, isocyanate and dibutyltin dilaurate into a 500mL flask, heating to 70-85 DEG C, and stirring to react for 1-2 hours to obtain a polyurethane prepolymer; adding a charring agent into the polyurethane prepolymer, and continuously reacting for 1-2 hours; cooling to 60 DEG C, and then adding 2, 2-dimethylolbutyric acid and amino carbon nanotubes to react for 0.5-1 hour; adding a high-refraction material, reacting at 65-70 DEG C for 1-2 hours, cooling to 40 DEG C, adding triethylamine, and reacting for 0.5-1 hour; the preparation method comprises the following steps: adding deionized water, adding an ammonium polyphosphate solution at a rotating speed of 2000r / min, and carrying out high-speed shearing emulsification for 0.5-1h to obtain the flame-retardant, high-refraction and melt-drop-resistant polyurethane coating which has the advantages of high flame retardance, high refractive index and no melt drop.

The invention provides a waterproof coating, a preparation method and a coating. The waterproof coating is prepared from the following raw materials: silane modified polyurethane resin; a silane modified anti-UV nano filler; the silane-modified anti-UV nano-filler comprises silane-modified polyurethane resin and a silane-modified anti-UV nano-filler, the silane-modified polyurethane resin is obtained through a reaction of silane-modified composite isocyanate and polyether polyol, and the silane-modified polyurethane resin and the silane-modified anti-UV nano-filler have silane groups, epoxy groups, vinyl groups and optional ureido groups.

The invention relates to the technical field of wave-transparent composite materials, in particular to a fiber-reinforced resin-based wave-transparent composite material and a preparation method thereof. The cyanate ester resin matrix is modified by thermosetting polyphenyl ether, the dielectric property of the cyanate ester resin is remarkably improved, the glass-transition temperature of the cyanate ester resin is maintained, and the problems of high curing temperature, poor toughness of a cured product, poor manufacturability and the like of the cyanate ester resin are solved by compounding the catalyst and the flexibilizer. The obtained cyanate ester resin system has excellent dielectric properties and humidity and heat resistance, also has good mechanical properties and manufacturability, meets the requirements of hot melt method prepreg preparation and autoclave molding process, and prepares a wave-transparent composite material with low dielectric properties.

A resin composition, a prepreg and a preparation method therefor, and a laminate and a preparation method therefor. The resin composition comprises the following raw materials in parts by mass: 20-50 parts of a modified bismaleimide prepolymer, 10-40 parts of cyanate ester resin, 30-60 parts of functional resin, and 50-200 parts of an inorganic filler, wherein raw materials of the modified bismaleimide prepolymer include bismaleimide resin and a modifier, and the modifier comprises tripolynaphthalene diallyl ether. A cured product of the resin composition has an extremely low coefficient of thermal expansion, excellent high-temperature modulus retention and extremely high heat resistance, also shows excellent dielectric properties, and is thus suitable for preparing high-performance semiconductor packaging substrates.

A preparation system and method for an isocyanate. The preparation system comprises a cold phosgenation reactor and a hot phosgenation reactor, which are connected in series, wherein the hot phosgenation reactor is used for receiving a material flow output from the cold phosgenation reactor and allows the material flow to undergo a hot phosgenation reaction so as to obtain an isocyanate; the hot phosgenation reactor comprises a rectifying section, a reaction section and a stripping section; a material flow inlet is provided between the rectifying section and the reaction section; and the reaction section comprises a plurality of layers of trays (100), and an outer weir (102) of an overflow weir of the reaction-section tray (100) at each layer has a different angle of inclination, so as to make the residence duration of the material flow on each reaction-section tray (100) greater than a set duration. By means of the solution, the residence duration of the material flow in the reaction section can reach the set duration, and the duration of a reaction of chloroformamide can be adjusted, which can thus reduce the number of solid particles generated, thereby solving the problem of same silting up a reactor.

The invention belongs to the technical field of polyurethane elastomers, and discloses a high-strength room-temperature self-repairing lignin / polyurethane composite elastomer as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, gradually polymerizing long-chain dihydric alcohol, irregular isocyanate, a hydrazide chain extender and a dioxime chain extender to obtain a polyurethane matrix with multiple dynamic bonds, and then introducing high-rigidity lignin and metal ions to prepare the lignin-reinforced polyurethane composite elastomer. The lignin / polyurethane composite elastomer prepared by the invention has the characteristics of good compatibility, high strength, room-temperature self-repairing and repeatable hot working, and overcomes the problems that a common lignin-based polyurethane elastomer is poor in compatibility, and the high strength and low-temperature self-repairing cannot be realized at the same time.

The invention discloses an aircraft fairing and a fairing body composite material integrated forming process, and relates to the technical field of aviation equipment manufacturing. The forming process comprises the following steps: 1) preparing a prepreg; (2) sectional forming; 3) a curing process; (4) demolding and trimming; 5) an assembly process; the whole of the front section, the middle section and the tail section of the fairing is of a long-size U-shaped streamline structure. According to the invention, through molecular collaborative design of fluorination modification-polysiloxane toughening-cyanate ester interpenetration, the key contradiction of a high-performance fairing material is systematically solved; ultrahigh strength and toughness are realized at the same time by utilizing in-situ nano microphase separation; a dense graphite carbon layer is generated through catalysis, so that efficient halogen-free flame retardance is achieved; by means of the partition design of molecular fluorination and surface metallization, the high wave transmission and lightning protection functions are ingeniously unified. And finally, a new generation of aircraft fairing composite material with force bearing, wave transmission, heat resistance, impact resistance and environmental stability is successfully prepared.

The invention discloses a preparation method and application of a synergistically modified waterborne polyurethane emulsion, and belongs to the technical field of macromolecular waterborne polyurethane. The preparation method comprises the following steps: firstly, modifying diisocyanate by using binary fluoroalcohol to obtain a fluorine-containing isocyanate emulsion, then preparing a waterborne polyurethane prepolymer emulsion by using the fluorine-containing isocyanate emulsion and dihydric alcohol, and finally, modifying the waterborne polyurethane prepolymer emulsion by using bisphenol A type epoxy resin to prepare the synergistically modified waterborne polyurethane emulsion. An adhesive film prepared from the synergistically modified waterborne polyurethane emulsion has excellent water resistance, mechanical properties and thermal stability, the salt spray resistance is particularly remarkably improved compared with that of an adhesive film prepared from a single compound modified waterborne polyurethane emulsion, the maximum salt spray resistance can reach 18 months, and the adhesive film has good practical application value and industrial production prospects.

The invention relates to a resin composition and a preparation method thereof, a prepreg, a laminated board and a printed circuit board. The resin composition is prepared from the following components in parts by mass: 30 to 80 parts of modified bismaleimide prepolymer and 20 to 60 parts of cyanate ester resin, the modified bismaleimide prepolymer is prepared from the following raw materials: bismaleimide resin and a diamine compound, wherein the diamine compound contains a benzocyclobutene structure. In the resin composition, the modified bismaleimide prepolymer prepared from specific preparation raw materials and the cyanate ester resin are matched according to a specific proportion, so that the resin composition has a relatively low thermal expansion coefficient; meanwhile, the glass transition temperature and the thermal decomposition temperature are higher, the peel strength and the elastic modulus are higher, and the dielectric constant and the dielectric loss are lower, so that the high thermal stability, the size stability, the mechanical property and the dielectric property are better.

Disclosed are a build-up adhesive film for a flame-retardant FC-BGA packaging substrate, a preparation method therefor, and a use thereof, said film comprising, in parts by weight: 30-40 parts of an epoxy resin; 20-25 parts of a curing agent; 1-3 parts of a phenoxy resin; 0.05-0.1 parts of a curing accelerator; 80-100 parts of an inorganic filler, the inorganic filler being selected from one or two of modified boron nitride nanotubes and modified silica; the curing agent comprises a phosphorus-containing cyanate. The present invention uses the curing agent and the inorganic filler to form a composite flame retardant system on the basis of the epoxy resin, the phenoxy resin, the curing accelerator and other components to ensure the application of the build-up adhesive film in FC-BGA packaging substrates; the curing agent uses a phosphorus-containing cyanate, and when it burns, the phosphorus-containing group generates a phosphaphenanthrene group in the gas phase, which can form a stable structure and provide a free radical quenching function; in addition, the nitrogen-containing structure can also obtain a hindered amine structure having a quenching effect, forming a non-flammable gas, providing a gas phase dilution function, and effectively improving the flame retardant effectiveness of the build-up adhesive film.

The invention discloses a super-hydrophobic self-repairing polyurethane film for photovoltaics and a preparation method of the super-hydrophobic self-repairing polyurethane film. The super-hydrophobic self-repairing polyurethane film is prepared from the following components in parts by weight: polyether polyol, isocyanate, a catalyst, a solvent, a self-repairing auxiliary agent, a chain extender and super-hydrophobic nanoparticles, the super-hydrophobic nano particles are fluorine-silicon polymer nano particles which are modified hydrophobic nano particles obtained by hydrolyzing two or more organic silicon and then introducing a C-F bond through copolycondensation to realize fluorination modification; the service life of the composite material is prolonged, the durability of the composite material is improved, and the material can be self-healed after being damaged by the outside; on the basis of self-repairing, hydrophobic nanoparticles are added to realize a super-hydrophobic surface; the transparent polyurethane film material for the photovoltaic power generation panel can be adhered through electrostatic adsorption or other adhesives, so that the film material is loaded on the photovoltaic panel, the photovoltaic panel is protected, and the photovoltaic panel is prevented from being damaged due to external environment pollution.

The invention belongs to the technical field of hot melt adhesive processing, and particularly relates to a quick-drying polyurethane hot melt adhesive and a preparation method thereof. The preparation method comprises the following steps: mixing polyether polyol, isocyanate, a chain extender A, a chain extender B, a crystallization promoting agent, a surface drying promoting agent and an auxiliary agent, and carrying out extrusion granulation, wherein the chain extender A is obtained by carrying out a reaction on acrylamide and diethanol amine and then carrying out siloxane modification on the reaction product by utilizing methacryloyloxymethyltrimethoxysilane; and the chain extender B is obtained by reacting tetrakis hydroxymethyl phosphonium sulfate and barium hydroxide octahydrate and oxidizing by hydrogen peroxide. The prepared hot melt adhesive has better viscosity and also has a certain flame-retardant effect.

The invention relates to the field of new energy batteries, in particular to a negative electrode current collector and a preparation method thereof, a pole piece and a battery, and the preparation method comprises the following steps: preparing a carbon nanotube with a hydroxyl group on the surface; mixing a carbon nanotube with hydroxyl on the surface, an isocyanate raw material, diol, water and a second organic solvent, and carrying out heating reflux treatment to obtain a third product; mixing the third product, a polytetrahydrofuran raw material, a second organic solvent and a second ammonium salt, and carrying out a polymerization reaction to obtain a precipitate; carrying out drying treatment on the precipitate, so as to obtain foam polyurethane modified by the carbon nano tube; and taking the foam polyurethane modified by the carbon nano tube as a working electrode, carrying out deposition reaction on the working electrode to obtain a base material with a metal layer deposited on the surface, and washing and drying the base material with the metal layer deposited on the surface. The negative electrode current collector lithium metal battery provided by the invention has relatively large energy density, relatively small battery internal resistance, relatively strong cycle performance and relatively low safety risk.

The invention belongs to the technical field of catalytic science, and relates to a preparation method of isocyanate catalyzed by a photoinitiator. The preparation method comprises the following steps: mixing an organic amine compound with chloroform, adding a photoinitiator 2959, carrying out irradiation reaction under ultraviolet light, and carrying out distillation or filtration to remove a solvent and byproducts so as to obtain isocyanate. According to the preparation method of the isocyanate provided by the invention, the oxidation of the chloroform compound on the organic amine is realized under a mild condition through the participation of the photoinitiator 2959, so that the isocyanate is generated. Compared with a traditional phosgene method, the method is safer and more environmentally friendly, reaction conditions are simple and easy to control, and the method has good industrial application potential.

The invention relates to the technical field of rubber materials, in particular to a high-strength and low-dielectric-loss epoxy resin composite material and a preparation method thereof. The epoxy resin composite material is prepared from the following raw materials in parts by weight: 100 parts of modified epoxy resin, 12 to 18 parts of cyanate ester resin, 40 to 50 parts of aramid fiber, 10 to 15 parts of filler, 15 to 25 parts of flexibilizer, 1 to 6 parts of first curing agent and 1 to 2 parts of accelerant. The epoxy resin composite material with high strength and low dielectric loss has the advantages of high strength, good impact resistance, high breakdown strength, low dielectric constant and low dielectric loss. The requirements of high-voltage power transmission equipment insulation parts, high-frequency circuit substrates, spacecraft lightweight structural members and the like on the fields with strict requirements on mechanical strength and dielectric properties can be met; and the preparation method is simple and controllable, the production cost is relatively low, and large-scale production can be realized.

This epoxy resin composition comprises a component (A) that is an epoxy resin, a component (B) that is at least one curing agent selected from the group consisting of triazine skeleton-containing phenolic curing agents, active ester-based curing agents, and cyanate ester-based curing agents, and a component (C) that is a compound represented by a prescribed chemical formula and is preferably an imidazole compound.