598 results about "Inorganic nanoparticles" patented technology

The invention belongs to the technical field of aerogel materials, and particularly relates to antistatic aerogel for 3D printing as well as a preparation method and application of the antistatic aerogel. The preparation method comprises the following steps: (1) dispersing inorganic nanoparticles modified by a silane coupling agent containing epoxy groups and an aniline monomer in an acidic solvent to obtain a monomer mixed solution; (2) stirring and dissolving polyamide in the monomer mixed solution; (3) initiating a reaction to obtain a polyaniline modified polyamide solution; and (4) freeze-drying to obtain the antistatic aerogel for 3D printing. By controlling synthesis conditions, a core-shell structure of acid-doped polyaniline coated inorganic nanoparticles is formed, and a good conductive path is formed in polyamide with a small addition amount of polyaniline. The antistatic aerogel for 3D printing can be applied to technologies such as photocuring molding and fused deposition of polyurethane resin in a 3D printing technology, and the antistatic property and the mechanical property of a 3D printed product are improved.

The invention belongs to the technical field of aerogel materials, and particularly relates to high-performance antistatic aerogel for 3D printing as well as a preparation method and application thereof. According to the invention, inorganic hollow nanoparticles are selected as a nucleating modifier for in-situ polymerization of aniline monomers in a polyamide solution, so that polyaniline-coated inorganic hollow nanoparticles are uniformly dispersed in polyamide, and the aerogel composite material with polyamide as a continuous phase and polyaniline-coated inorganic hollow nanoparticles as a conductive and reinforced phase is formed. The use of the hollow inorganic nanoparticles avoids the problem that the solid inorganic nanoparticles lose the characteristics of the inorganic nanoparticles due to high specific gravity and high surface energy, and easy agglomeration or adsorption with other substances in the preparation process of the solid inorganic nanoparticles. The inorganic hollow nanoparticles are adopted as a nucleating modifier, so that the problems of agglomeration of solid nanoparticles and dispersion in a polyamide matrix are well solved.

The invention relates to the technical field of coatings, in particular to a high-performance environment-friendly coating and a galvanized sheet prepared from the same. The high-performance environment-friendly coating is prepared from the following components in parts by weight: 120 to 150 parts of waterborne polyurethane dispersion liquid, 10 to 15 parts of graphene oxide nanosheets, 4 to 10 parts of boron nitride nanosheets, 2 to 6 parts of inorganic nanoparticles, 0.5 to 2 parts of anti-settling agent, 0.5 to 2 parts of defoaming agent, 0.2 to 2 parts of wetting dispersant and 50 to 100 parts of deionized water. By selecting inorganic nanoparticles with specific particle sizes, the inorganic nanoparticles can be dispersed between the boron nitride nanosheets and the graphene oxide nanosheets, the dispersion and lubrication effects similar to those of bearings are achieved, the isolation and shielding effects of the nanosheet material are improved, and the stability of the coating is improved.

The invention relates to the technical field of oil-displacing agents, and particularly discloses a targeted nano oil-displacing agent and a preparation method thereof. A preparation method of a targeted nano oil displacement agent comprises the following steps: S1, dispersing 10-30 parts by mass of silanized inorganic nanoparticles in an alcoholic solution, adding 5-12 parts by mass of a functional monomer, 8-20 parts by mass of a hydrophilic monomer and 5-15 parts by mass of a hydrophobic monomer in an inert atmosphere, uniformly mixing, heating to 75-85 DEG C, adding an initiator, carrying out a constant temperature reaction for 4-6 h, and cooling to obtain a pre-grafted nanoparticle dispersion liquid; s2, mixing the pre-grafted nanoparticle dispersion liquid with a composite surfactant, adjusting the pH value to 6.5-7.5, and mixing at 30-40 DEG C for 22-26 hours to obtain the targeted nano oil displacement agent, the targeting type nano oil displacement agent prepared by the invention can still keep excellent dispersion stability and ultralow interfacial tension under the condition of a high-salt oil reservoir, so that the oil displacement efficiency is remarkably improved.

A method of treating or maintaining an apparatus is achieved by subjecting at least one treated component of an apparatus to electrochemical corrosion protection. The treated component has surfaces treated with a coating of a treatment composition of a colloidal particle dispersion having inorganic nanoparticles with an average particle size from 500 nm or less that exhibit properties of Brownian motion. At least some of the inorganic nanoparticles are ionically charged nanoparticles, and wherein at least some of the ionically charged nanoparticles reside on the surfaces when the at least one treated component of an apparatus is subjected to electrochemical corrosion protection.

The invention belongs to the technical field of aqueous zinc ion batteries, and discloses a zinc ion battery gel electrolyte as well as a preparation method and application thereof. The preparation method of the zinc ion battery gel electrolyte comprises the following steps: adding a propylene derivative and cellulose into an electrolyte solution, and uniformly stirring to obtain a solution A; adding inorganic nanoparticles into the solution A, and uniformly dispersing to obtain a solution B; and adding an initiator and a cross-linking agent into the solution B, uniformly stirring, defoaming, and polymerizing in a mold to obtain the zinc ion battery gel electrolyte. The gel electrolyte is simple in preparation method and low in cost, has good mechanical performance, corrosion resistance, electrochemical performance and cycling stability, can stably circulate for more than 1000 hours after being assembled into the zinc ion battery, is a gel electrolyte with high safety and efficient stability, and has an important application prospect in the zinc ion battery.

The invention discloses an acrylate grouting material and a preparation method thereof.The acrylate grouting material comprises a component A and a component B. The component A comprises, by weight, 40-90 parts of an acrylate main agent; 1-15 parts of a cross-linking agent; 0.1 to 10 parts of an accelerant; 1-30 parts of an inorganic filler; the component B comprises the following components in parts by weight: 0.1-10 parts of an initiator; wherein the inorganic filler is selected from one or two of an inorganic cementing material and inorganic nanoparticles. An organic-inorganic interpenetrating network structure is constructed on the basis of an electrostatic complexing action principle between an organic monomer and an inorganic monomer by using an inorganic cementing material and inorganic nanoparticle hybridized acrylate, so that the strength of a slurry consolidated body is greatly improved and the service life of the slurry consolidated body is greatly prolonged on the premise of ensuring the permeability of the slurry.

The invention discloses a microporous diaphragm for a low-electrical-impedance lithium battery and a preparation method of the microporous diaphragm. The diaphragm comprises: a base film layer, wherein the base film layer is of a microporous structure formed by biaxially stretching polypropylene and / or polyethylene; the surface of the base film layer is coated with the functional coating, and the functional coating contains mixed slurry of inorganic nanoparticles and a binder; the surface modification layer is formed by introducing a hydrophilic electrolyte group on the surface of the functional coating through plasma treatment or chemical grafting. The base membrane layer forms a uniform micropore structure through a two-way stretching process, the functional coating is formed by compounding nano silicon dioxide or aluminum oxide and polyvinylidene fluoride according to a specific proportion, a porous layer with gradient pore diameter is formed, the pore size of the porous layer is smaller than that of the base membrane layer, and efficient permeation of electrolyte is ensured. Electrolyte-philic groups such as sulfonic groups are introduced into the surface modification layer, so that the wettability of the diaphragm to an electrolyte is remarkably improved. During preparation, the base membrane is formed through melt blending, two-way stretching and pore-forming agent extraction, and then the functional layer is constructed through slurry coating and a low-temperature plasma treatment or sulfonation process. The diaphragm combines gradient aperture design, inorganic filler enhancement and surface chemical modification, and realizes low impedance, high thermal stability and excellent mechanical strength.

The invention belongs to the field of advanced materials, and particularly relates to super-flexible and ultrathin hybrid glass and a low-temperature large-area preparation method thereof, and the hybrid glass comprises the following raw materials: oligomeric silsesquioxane, inorganic nanoparticles and a high-molecular polymer porous film. The ultra-flexible and ultra-thin hybrid glass prepared by the invention can be processed and formed at room temperature or lower temperature, compared with the existing commercial ultra-thin glass, the flexibility of the ultra-thin hybrid glass is remarkably improved, the ultra-thin hybrid glass is thinner, the problem that the traditional glass is fragile and the technical challenge in a thinning process are overcome, and the ultra-flexible and ultra-thin hybrid glass has good application prospects. The electronic equipment can be lightened and thinned, and the service life of the electronic equipment can be prolonged.

The invention relates to the technical field of cable production, and discloses a flame-retardant rat-proof cable, which comprises a conductor, and a conductor shielding layer, an insulating layer, a fireproof layer and a sheath layer which are sequentially coated outside the conductor. The invention provides a production method which comprises the following steps: S1, preparing raw materials; s2, sheath layer material mixing; s3, extruding a conductor shielding layer; s4, extruding an insulating layer; s5, wrapping a fireproof layer; and S6, extruding a sheath layer. According to the present invention, the natural plant extract and the inorganic nanoparticle compound with the specific ratio are introduced as the rat-proof additive, such that the special odor of the natural plant extract is adopted to effectively repel the rats so as to reduce the possibility of approaching and biting the cable, and the dual rat-proof mechanism of the odor repelling and the physical protection is achieved; the problem that the rat-proof performance of the cable is reduced due to the plasticizing effect of the flame retardant is effectively solved.

A method of treating or maintaining an apparatus is achieved by subjecting at least one treated component of an apparatus to electrochemical corrosion protection. The treated component has surfaces treated with a coating of a treatment composition of a colloidal particle dispersion having inorganic nanoparticles with an average particle size from 500 nm or less that exhibit properties of Brownian motion. At least some of the inorganic nanoparticles are ionically charged nanoparticles, and wherein at least some of the ionically charged nanoparticles reside on the surfaces when the at least one treated component of an apparatus is subjected to electrochemical corrosion protection.

The invention discloses a composite polyacrylamide flocculant based on a nano core-shell structure as well as a preparation method and application of the composite polyacrylamide flocculant. The composite polyacrylamide flocculant is a core-shell structure composite material which takes inorganic nanoparticles grafted with carbon-carbon double bonds on the surface as a core and takes a polyacrylamide copolymer as a shell; the polyacrylamide copolymer is prepared from the following components in parts by mass: 70 to 90 parts of acrylamide, 10 to 30 parts of functional monomer and 0.1 to 1.0 part of cross-linking agent. The basic conception of the flocculating agent provided by the invention is that the structural design of inorganic nano core-organic polymer shell is adopted, PAM molecular chains firmly grow on the surfaces of nano particles in a chemical grafting manner, high dispersion and functional synergy of nano units are realized, and the obtained product has the characteristics of high flocculation speed, dense floc, high removal efficiency and the like, and has a wide application prospect. The method is especially suitable for deep treatment of difficult-to-treat industrial wastewater such as oil-containing wastewater, dye wastewater and heavy metal wastewater.

The present invention relates to the technical field of aromatic polyamide fiber spinning aids, and specifically relates to a light aging resistant sizing agent for aramid fibers, an anti-ultraviolet aramid fiber and a preparation method thereof. The light aging resistant sizing agent includes a spinning sizing agent, an anti-ultraviolet aging agent and a coupling agent; the anti-ultraviolet aging agent includes inorganic nanoparticles and organic ultraviolet stabilizers. The preparation method of the anti-ultraviolet aramid fiber is as follows: perform an oiling operation on the para-aramid fiber, and then perform heating to achieve thermal crosslinking to obtain the anti-ultraviolet aramid fiber. By adding inorganic nanoparticles and organic ultraviolet stabilizers to the spinning sizing agent and fixing them on the fiber surface through a thermal crosslinking reaction, the present invention forms an anti-ultraviolet aging protection layer that can exert an ultraviolet protection effect, which can well solve the problems of poor anti-ultraviolet performance of para-aramid fibers and accelerated oxidation and degradation of polymer chains under ultraviolet light, and can also meet the requirements for fiber properties such as stretching and wear resistance in subsequent processes.

The invention discloses application of small molecules containing diphosphonic acid groups in preparation of hydrophilic inorganic nanoparticles, and relates to the technical field of preparation of inorganic nanoparticles. The method comprises the following steps: dispersing inorganic nanoparticles coated with a hydrophobic organic compound on the surface into tetrahydrofuran, dropwise adding into a small molecule solution containing a diphosphonic acid group, uniformly mixing, and adding diethyl ether to prepare the hydrophilic inorganic nanoparticles. The method is simple and convenient to operate, mild in condition, rapid in conversion, high in conversion rate, energy-saving and efficient, and the converted nano-particle freeze-dried powder is stable in property and easy to store and transport and has certain popularization value. The problems that in the prior art, an inorganic nanoparticle hydrophilic modification method is complex, and conversion efficiency is low are solved.

The invention provides a toughened curing-controllable prepreg and a preparation method thereof, and belongs to the technical field of high-performance composite materials. Comprising the following components in parts by mass: 100 parts of epoxy resin, 100 parts of a thermoplastic resin toughening agent, 100 parts of an inorganic nanoparticle toughening agent, 100 parts of a latent curing agent, 100 parts of an organic urea accelerant, 100 parts of an imidazole accelerant and 100 parts of a reactive diluent, correspondingly, 1-5 parts by mass of a thermoplastic resin flexibilizer, 0-3 parts by mass of an inorganic nanoparticle flexibilizer, 4-8 parts by mass of a latent curing agent, 1-4 parts by mass of an organic urea accelerator, 0.1-0.5 part by mass of an imidazole accelerator and 5-20 parts by mass of an active diluent are added. The prepreg provided by the invention not only is endowed with fast curing and controllable curing time, but also is endowed with relatively long room-temperature storage period, high toughness and good impact resistance, and is especially suitable for the fields of low-altitude aircrafts, automobiles, ships and the like.

A dental polishing paste and a method of surface finishing a dental ceramic with the dental polishing paste is described. The dental polishing paste includes 60 to 90 weight percentage (wt. %) glycerin; 7.5 to 17.5 wt. % inorganic nanoparticles such as, diamond or zirconia, having a mean particle size of 5 to 25 nanometer (nm); and 2.5 to 32.5 wt. % additive, each based on a total weight of dental polishing paste.

The invention provides a special flame-retardant PC / ABS alloy material for a high-heat-resistant power battery accessory and a preparation method of the special flame-retardant PC / ABS alloy material, and relates to the technical field of high polymer materials. According to the invention, PC and ABS with specific indexes are selected to improve the strength and heat resistance of the basic resin. Three combustion improvers with different flame-retardant mechanisms and an activated 4A molecular sieve are used as auxiliary flame-retardant synergists, so that the effect of the auxiliaries is exerted to the greatest extent, the total addition amount is reduced, and the loss of material performance is reduced; the heat resistance of the material is enhanced by matching the organic polymer heat-resistant agent and the inorganic nanoparticles, and the heat deformation temperature and the vicat softening point are improved by a relatively low addition amount. Compared with a general grafting toughening agent and an MBS toughening agent, the impact-resistant toughening agent with a core-shell structure of an organic silicon system is selected, so that the low-temperature impact resistance and the weather resistance are more excellent, the synergistic effect on a flame-retardant system is good, and the material is endowed with a good appearance.

The invention relates to the technical field of optical cement, in particular to high-temperature-resistant acrylic optical cement with high light transmittance and a preparation method of the high-temperature-resistant acrylic optical cement. The preparation method of the high-light-transmittance high-temperature-resistant acrylic optical adhesive comprises the following steps: (1) under the protection of inert gas, mixing an acrylate monomer, a carboxyl-containing monomer, an epoxy-containing monomer, a hydroxyl-containing monomer, a photoinitiator and modified inorganic nanoparticles, and stirring at 60-90 DEG C and 200-600rpm for 3-8 hours to obtain an adhesive solution; and (2) carrying out vacuum curing on the glue solution at 50-80 DEG C for 5-15 minutes to form a glue material, pressing the glue material into a film, and cooling to obtain the optical cement. The prepared high-temperature-resistant acrylic optical adhesive with high light transmittance has good light transmittance, high-temperature resistance and good peel strength, the light transmittance of the optical adhesive is larger than 90%, the heat-resistant temperature is larger than 150 DEG C, the peel strength is larger than 14 N / 25 mm, and the peel strength after high-temperature treatment is larger than 11.8 N / 25 mm.

A diffractive pigment includes diffractive pigment, includes a stack including alternating layers of a high refractive index layer and a low refractive index layer, in which the high refractive index layer is a composition including an organic material and high refractive index inorganic nanoparticles; in which at least one layer of the stack is embossed. A method of making a diffractive pigment is also disclosed.

The invention belongs to the technical field of temperature-regulating and sweat-discharging materials, and particularly relates to a temperature-regulating and sweat-discharging material and application thereof in fibers and flocculus. The preparation method of the temperature-regulating and sweat-discharging material comprises the steps of surface modification of inorganic nanoparticles, preparation of a shell material solution, preparation of a core material solution and preparation of the temperature-regulating and sweat-discharging material. Finally, the phase-change microcapsule, namely the temperature-regulating and sweat-discharging material, which takes the phase-change material as a core and takes the composite material of the cross-linked polyvinylpyrrolidone / 2-acrylic acid-2-[[(butylamino)-carbonyl] oxo] ethyl ester copolymer doped with the inorganic nanoparticles as a shell is obtained. The temperature-regulating and sweat-discharging material is high in thermal conductivity and good in washable effect, can be added into a fiber matrix before spinning, can be used for preparing filling flocculus, and can be prepared into coating liquid to form a coating on the surface of a fabric in forms of hot rolling, spraying and the like; the fabric has potential application value in multiple fields such as work clothes, firefighter uniform, warmth retention articles, bedding articles, sportswear, shoes and hats and the like.

The invention relates to the technical field of rubber, and relates to a wear-resistant rubber composite material and a preparation method thereof. The wear-resistant rubber composite material is prepared from the following components in parts by weight: 100 parts of a rubber matrix, 30 to 60 parts of multi-stage core-shell structure composite filler, 10 to 15 parts of carbon black, 1.0 to 2.5 parts of a vulcanizing agent, 0.5 to 2.0 parts of an accelerant, 3 to 6 parts of an active agent and 1 to 3 parts of an anti-aging agent, the multi-stage core-shell structure composite filler sequentially comprises a rigid inorganic nano-particle core, a rigid inorganic nano-particle core and a rigid inorganic nano-particle core from inside to outside, the core is coated with the first shell layer, the first shell layer is a mesoporous silica layer, and a silane coupling agent containing sulfur groups is modified in the mesoporous silica layer; and the second shell layer is coated outside the first shell layer and is a hyperbranched polymer layer. According to the wear-resistant rubber composite material provided by the invention, the comprehensive mechanical property and wear resistance of the rubber composite material are improved.

The invention discloses application of a particle stabilizer, an oil-in-oil Pickering emulsion as well as a preparation method and application of the oil-in-oil Pickering emulsion, and relates to the technical field of emulsion preparation. The particle stabilizer is used for preparing the oil-in-oil Pickering emulsion, and the particle stabilizer is solid insoluble nanoparticles and is selected from one or more of inorganic nanoparticles, organic nanoparticles, composite oleophobic nanoparticles and stimuli-responsive nanoparticles. The preparation method of the oil-in-oil Pickering emulsion comprises the following steps: mixing the first oil phase, the second oil phase and the particle stabilizer, and carrying out an emulsification technology to obtain the oil-in-oil Pickering emulsion. According to the emulsion system prepared by the invention, the oil phase components with different polarity differences are reasonably matched, and the oil phase type is flexibly selected according to specific requirements of target application, so that the environmental adaptability and the function application range of the emulsion can be remarkably improved, and the emulsion system has a good application prospect.

The invention discloses an inorganic pigment-based colored radiation cooling coated fabric which comprises a fiber fabric, and a daytime passive radiation coating and a modified inorganic pigment coating which are sequentially coated on the surface of the fiber fabric, the daytime passive radiation coating is an inorganic nano particle coating; the particle size distribution of the inorganic nanoparticles is nanoscale, the sunlight reflectivity of the inorganic nanoparticles is more than 90%, and the mid-infrared radiance of the inorganic nanoparticles is more than 85%; the preparation method of the modified inorganic pigment comprises the following steps: ball-milling an inorganic pigment, adding the ball-milled inorganic pigment into an organic solvent, adding an inorganic non-metallic material, uniformly mixing, standing, taking an upper-layer solution, and drying to obtain inorganic non-metallic microspheres of which the surfaces are adsorbed with the inorganic pigment; and calcining the inorganic nonmetal microspheres with the inorganic pigment adsorbed on the surfaces to obtain the modified inorganic pigment. The problems that in the prior art, a radiation cooling coating is monotonous in color, complex in preparation method, high in cost and the like are solved.

The invention relates to the technical field of optical films, and discloses a PET-based composite optical film and a preparation method thereof.The optical film is prepared from 100 parts of PET master batch, 5-10 parts of anti-blue-light nanofiller and 1-3 parts of interfacial compatibilizer through melt extrusion, asynchronous two-way stretching, online anti-fingerprint coating liquid coating and cooling and rolling; the blue-light-resistant nano filler is a core-shell structure filler prepared by taking KH570 silanized nano cerium oxide as a core, polymerizing by grafting glycidyl methacrylate to form a shell layer, and then reacting with 1H-benzotriazole-1-methanol. The anti-fingerprint coating liquid is prepared from perfluoropolyether modified siloxane acrylate and nano silicon dioxide sol. Through core-shell filler design and functional coating online coating, the technical problems that inorganic nanoparticles are easy to agglomerate and organic small molecule auxiliary agents are easy to migrate are synergistically solved, and the obtained optical film has excellent properties of high light transmittance, low haze, efficient blue light resistance and lasting fingerprint resistance and is good in durability.

The invention discloses a pH accurate response type water repellent agent for a cement-based material based on isoelectric point characteristics and a preparation method of the water repellent agent. The hydrophobic agent comprises a hydrophobic substance inner core dispersed in a dispersing agent, an amphoteric surfactant layer which is adsorbed on the surface of the inner core and has electric point characteristics, and an inorganic nanoparticle coating layer coating the amphoteric surfactant layer, and the hydrophobic agent is in an emulsion state. The preparation method comprises the following steps: adding the ampholytic surfactant with the electric point characteristic into the dispersing agent, uniformly stirring, then adding the hydrophobic substance, continuing stirring treatment, then adding the inorganic nanoparticles, and stirring and emulsifying to obtain the hydrophobic agent. According to the prepared hydrophobic agent, accurate release of hydrophobic substances in the later stage of cement hydration is achieved, interference of early release on cement hydration is avoided, and the stability and the long-term effect of the hydrophobic effect are remarkably improved.

The embodiment of the invention relates to a high-temperature-resistant damp-heat-resistant anticorrosive coating as well as a preparation method and a use method thereof, belongs to the technical field of functional coatings, and solves the problem that an existing high-temperature-resistant coating cannot give consideration to durability and corrosion resistance in a damp-heat environment. The high-temperature-resistant damp-heat-resistant anticorrosive paint comprises a first component and a second component, the first component comprises 35-55 parts of organic silicon resin, 20-40 parts of functional filler, 5-15 parts of a corrosion inhibitor, 5-15 parts of inorganic nanoparticles, 1-3 parts of an auxiliary agent and 5-15 parts of a solvent; and the second component comprises 1-5 parts of an amine curing agent. By adding the functional filler, the permeability resistance and thermal stability of the coating can be enhanced; by adding the corrosion inhibitor and the inorganic nanoparticles, gaps among the functional fillers can be filled, the corrosion inhibitor and the inorganic nanoparticles have a synergistic effect with the functional fillers, the compactness of the coating is increased, and the water resistance and the corrosion resistance of the coating are improved, so that the coating disclosed by the invention has excellent high temperature resistance, damp heat resistance and corrosion resistance.

The invention relates to the technical field of aromatic polyamide fiber spinning assistants, in particular to an aramid fiber anti-light-aging oil agent, an anti-ultraviolet aramid fiber and a preparation method, and the anti-light-aging oil agent comprises a spinning oil agent, an anti-ultraviolet-aging agent and a coupling agent; the anti-ultraviolet aging agent comprises inorganic nanoparticles and an organic ultraviolet stabilizer. The preparation method of the anti-ultraviolet aramid fiber comprises the following steps: oiling para-aramid fiber, and then heating to realize thermal crosslinking to obtain the anti-ultraviolet aramid fiber. The inorganic nanoparticles and the organic ultraviolet stabilizer are added into the spinning oil agent, and the spinning oil agent is fixed on the surface of the fiber through a thermal crosslinking reaction, so that an anti-ultraviolet aging protection layer capable of playing an ultraviolet protection effect is formed; the problems that the para-aramid fiber is poor in anti-ultraviolet performance and macromolecular chains accelerate oxidative degradation under ultraviolet light can be well solved, and the requirements of subsequent procedures for fiber performance such as stretching and wear resistance can be met.

The invention discloses an aramid fiber lithium battery diaphragm and a preparation method thereof, and belongs to the technical field of battery diaphragms. The preparation method of the aramid lithium battery diaphragm comprises the following steps: S1, mixing and stirring para-aramid fibers, DMSO, KOH and deionized water to prepare a para-aramid nanofiber solution; s2, modified silicon dioxide is added into the para-aramid nanofiber solution, then ultrasonic treatment and stirring are carried out, dispersion liquid is obtained, and the modified silicon dioxide is PEI grafted phosphorus-containing metal organic framework coated SiO2; and S3, coating the surface of a polyolefin diaphragm with the dispersion liquid, treating the coated diaphragm in an aqueous solution for 3-4 hours, and then drying to obtain the aramid fiber lithium battery diaphragm. According to the preparation method disclosed by the invention, the modified silicon dioxide is added, and the modified silicon dioxide is PEI grafted phosphorus-containing metal organic framework coated SiO2, so that the problems that in the prior art, the dispersity of inorganic nanoparticles is poor, and the interface bonding between the inorganic nanoparticles and para-aramid nanofibers needs to be improved are solved, and the comprehensive performance of the diaphragm is improved.

The invention belongs to the technical field of polymer composite materials, and particularly relates to a high-strength bismaleimide resin material and a preparation method thereof. The bismaleimide resin composition comprises the following components in parts by weight: 50-60 parts of bismaleimide resin, 40-50 parts of an allyl compound, 1-3 parts of modified graphene and 0.1-0.5 part of a dispersing filler, the dispersing filler is prepared from modified inorganic nanoparticles and modified tetrapod-like zinc oxide whiskers in a mass ratio of (0.1-1): 1. Wherein the tetrapod-like zinc oxide whiskers can promote the dispersion of the graphene with a large lamellar structure from the macroscopic aspect, so that the graphene is uniformly dispersed in a bismaleimide resin matrix, and the inorganic nanoparticles can play a role in lubrication and isolation, so that the agglomeration among graphene lamellas in a small range is prevented. By adding the graphene composite reinforcing filler, the rigidity of the bismaleimide resin material is improved, and the toughness of the composite material can be improved at the same time.

The invention belongs to the technical field of batteries, and relates to a composite phase change electrolyte and a preparation method and application thereof. The composite phase-change electrolyte comprises a lithium salt, a solvent, a cross-linking agent and inorganic nanoparticles, and the cross-linking agent is one or more of a polysiloxane derivative and a polyfunctional group acrylate derivative. According to the composite phase change electrolyte provided by the invention, relatively high ionic conductivity is provided, the ion diffusion resistance is reduced, and the electrolyte is always kept in a liquid state within a conventional temperature range; when the battery reaches the phase change temperature, the electrolyte is changed from liquid to solid, an ion path is blocked, and the safety protection of the battery at high temperature is realized; in addition, the battery using the composite phase change electrolyte has a relatively long cycle life at a room temperature and in a working environment of-30 DEG C. The composite phase-change electrolyte is suitable for a high-safety lithium ion battery, and is especially suitable for application scenes of extreme temperature conditions, such as high-temperature thermal runaway protection and low-temperature performance protection.