867 results about "Resin-Based Composite" patented technology

The invention belongs to the technical field of high polymer material design and intelligent manufacturing, and discloses a machine learning driven epoxy resin based composite material thermal-mechanical property aided design method, which comprises the following steps: S1, data acquisition and feature construction; s2, performing feature screening; s3, constructing and training an interpretable prediction model; s4, carrying out reverse design and optimization; and S5, performing closed-loop verification and updating. According to the method, the quantitative relation of structure-process-performance is constructed through an interpretable machine learning model, and the contribution mechanism of each factor is revealed by means of SHAP analysis. And finally, reversely designing an optimal epoxy resin monomer structure and a matched curing process according to the performance target. The limitation of a traditional trial and error method is broken through, collaborative optimization of the material structure and the forming process can be achieved, and the development efficiency of the epoxy resin-based carbon fiber composite material is remarkably improved.

Provided are a water-resistant wood-plastic reinforced composite flooring and a manufacturing method therefor. Wood flour is boiled in boiling water for 3-4 hours, filtered and dried, to obtain dried wood flour; polypropylene, butyl acrylate, methyl methacrylate, maleic anhydride and dicumyl peroxide are mixed evenly, extruded and granulated, and dried to obtain a compatibilizer; the dried wood flour and polypropylene are mixed evenly, the compatibilizer is added and mixed evenly, then extrusion and granulation, and injection molded, are performed, to obtain a wood-plastic flooring blank; a composite resin emulsion and a photoinitiator are ultrasonically mixed evenly, and the wood-plastic flooring blank is immersed therein, then taken out and dried at room temperature, and then vacuum dried and UV cured, to obtain water-resistant wood-plastic reinforced composite flooring.

The invention discloses a gradient gradual change type powder material as well as a preparation method and application thereof. The gradient gradual change type powder material comprises a non-metal core, a transition layer, a gradual change layer and a modification layer. The gradient powder material provided by the invention shows excellent strength-ductility synergistic effect, high fracture toughness and enhanced fatigue, wear and corrosion resistance, is good in metal wettability, can effectively reinforce a metal matrix and improve the performance of the metal matrix, can also be well dispersed in resin, and can be applied to the field of metal materials. The gradient powder material disclosed by the invention has a wide application prospect, and can be applied to the fields of heat dissipation of electronic devices, high-speed cutting tools, grinding material and grinding tool materials, high-temperature protection materials and the like.

The invention provides a preparation method of a self-repairing resin-based composite material based on dynamic bonds. The self-repairing epoxy resin comprises one covalent dynamic bond of a Diels-Alder bond, a disulfide bond or a borate bond, and the preparation method of the self-repairing epoxy resin comprises the following steps: heating epoxy resin to a molten state, adding a curing agent component while stirring, and carrying out a prepolymerization reaction to obtain a prepolymer; the curing agent comprises a rigid diamine curing agent, a dynamic diamine monomer and a flexible chain segment regulator, and the dynamic diamine monomer contains a dynamic covalent bond; and carrying out curing molding on the prepolymer to obtain the self-repairing epoxy resin. And impregnating reinforced fibers or fabrics thereof with the prepared prepolymer, and heating and curing to obtain the self-repairing resin-based composite material. The invention provides a chemical molecule design, dynamic reversible chemical bonds are introduced into a resin matrix, and by constructing the dynamic bonds, the composite material has high performance of a traditional composite material and also has life-like self-healing ability.

The present disclosure provides a low-temperature conductive paste and a raw material composition thereof, and a heterojunction cell electrode and a manufacturing method therefor. The raw material composition comprises the following components in percentage by mass: 2%-10% of a composite resin, 2%-4% of an organic solvent, 0.2%-1% of an auxiliary agent, and 85%-94% of conductive metal powder. The resin comprises a component A and a component B. The component A comprises a polyol and a blocked isocyanate. The component B comprises a curing agent and a resin. The present disclosure further provides a low-temperature conductive paste prepared from the raw material composition, a heterojunction cell electrode manufactured from the low-temperature conductive paste, a manufacturing method for the electrode, and a heterojunction cell manufactured from the electrode. The low-temperature conductive paste and the heterojunction cell electrode provided by the present disclosure have high conductivity and weather resistance.

The present application relates to the field of fiber-reinforced resin matrix composite molding, and in particular to a thermal compensation design and implementation method for the near-net-shape molding of a thermoset composite component and based on a temperature field and a cure degree field. The method comprises: establishing a minimum symmetric unit model on the basis of the size of a component, the size of a mold, and an ambient temperature; establishing a cure kinetics model and a heat transfer model; incorporating a molding temperature profile into a subprogram; on the basis of an obtained temperature field and an obtained cure degree field, performing simulated thermal compensation on regions where the temperature is lower than a molding temperature and the temperature difference from the molding temperature is greater than or equal to 5% of the molding temperature, until the difference between the temperature of each region and the current molding temperature is lower than 5% of the molding temperature; then, performing stimulated thermal compensation on regions where the cure degree is less than or equal to 0.9; and assembling a thermal compensation apparatus on the basis of a thermal compensation design scheme, performing experimental validation, and when the difference between an actually measured temperature value and a simulated value is less than 5% and the cure degree exceeds 0.9, obtaining a thermal compensation scheme and a thermal compensation method. The blindness of traditional molding that relies on experience is reduced.

The invention provides an online monitoring method for a curing process of a resin-based composite material, and belongs to the technical field of curing monitoring of composite materials. In the curing process of the resin-based composite material, a conductive patch is placed on the surface of the resin-based composite material to form a laminated structure consisting of the conductive patch, a dielectric layer containing resin and a high-reflection substrate, and the curing process of the resin-based composite material is deduced in real time by using a microwave signal to radiate the laminated structure and monitoring peak valley characteristics and temperature changes of a reflection signal. According to the method, a microwave signal is utilized to irradiate a laminated structure, and the curing process of the resin-based composite material is judged by monitoring the peak valley characteristics and temperature change of a reflected signal in real time. The in-situ online curing process monitoring method based on the microwave signal and the conductive patch film sensor not only can realize real-time online monitoring of the resin curing key point and the curing degree, but also has the remarkable advantages of being capable of adjusting the monitoring position in real time, realizing curing degree field monitoring and the like.

The invention relates to the technical field of polymer composite materials, and discloses a nano-ceramic-based composite insulating coating and a preparation method thereof, and the coating is prepared from a composite resin matrix, a composite functional ceramic filler, a double-reactivity organosilicon linker and an initiator. Wherein the composite resin matrix is composed of vinyl-terminated polydimethylsiloxane and a vinyl ether functionalized fluorocarbon copolymer, and a soft and rigid interpenetrating network structure is formed. The composite functional ceramic filler is prepared from needle-shaped silicon nitride, flaky hexagonal boron nitride, nano silicon dioxide, nano cerium oxide and nano barium titanate. According to the invention, a chemical bonding interface is constructed between the inorganic filler and the organic resin, and the synergistic effect of the composite matrix and the multifunctional filler is optimized, so that the coating has excellent adhesive force, flexibility and thermal shock resistance, obtains high volume resistivity and breakdown strength, and meets the insulation protection requirements under harsh working conditions.

The invention discloses a fusion graph recognition and symbolic expression-based resin-based composite material automatic native modeling and reverse design method and system, belongs to the field of composite material modeling and design, and particularly relates to a graph neural network and symbolic regression fusion-based composite material native modeling and structure reverse optimization method. The method comprises six steps of microcosmic image structure extraction, topological graph construction and graph embedding, constitutive relation symbol modeling, graph structure homogenization, performance-oriented reverse design and multi-modal performance prediction, and can realize an automatic process from microcosmic image to macroscopic performance prediction to structure optimization design. The problems that an existing method is low in efficiency, poor in interpretability and difficult in reverse design are solved, and the modeling efficiency and the design intelligence level of the composite material under multiple scales and multiple targets are improved.

The invention discloses polytetrafluoroethylene composite resin and a preparation method thereof. The polytetrafluoroethylene composite resin comprises one or more modified fillers to enhance mechanical properties, increase dielectric constant and reduce dielectric loss. According to the preparation method of the polytetrafluoroethylene composite resin, the modified filler is added into the polytetrafluoroethylene which is uniformly mixed with the dispersion liquid, and the modified polytetrafluoroethylene composite resin is obtained through condensation treatment. The method is simple and easy to operate, and the influence of introduction of other solvents on the resin performance can be avoided while high-concentration dispersion can be realized.

The invention relates to the technical field of coatings, and discloses an anti-falling environment-friendly wall paint and a preparation method thereof.The wall paint is composed of, by weight, 30-40 parts of composite resin, 10-20 parts of nanoscale filler, 10-20 parts of auxiliaries and 10-20 parts of additives. 10 to 14 parts of a nano-scale filling material; 5-10 parts of an auxiliary agent; the preparation method comprises the following steps: preparing the composite resin, the nano-scale filler, the auxiliary agent and the additive according to the weight parts of the formula, putting the composite resin and the nano-scale filler into a high-speed dispersion kettle, setting stirring conditions, adding the auxiliary agent twice, adding the additive again, adjusting the stirring conditions, forming a mixed system, adding the thickening agent and the deionized water to adjust the viscosity, forming a mixed material, and uniformly stirring. The preparation method comprises the following steps: adding the raw materials into a stirrer for stirring, adjusting the acid-base balance of the materials, carrying out curing treatment, carrying out defoaming operation on the cured materials under a vacuum condition for 15-20 minutes, completing the preparation of the wall paint, and finally detecting that the wall paint has the advantages of low VOC emission, no formaldehyde, no benzene, excellent adhesive force and strong weather resistance.

The invention relates to the technical field of photovoltaic glass coatings, and discloses an anti-reflection liquid with a self-repairing function, a preparation method of the anti-reflection liquid and an organic-inorganic hybrid coating prepared from the anti-reflection liquid. The polyurethane-silicon dioxide composite resin with a disulfide bond structure is introduced, so that an automatic repairing function of the coating when the coating is damaged by slight scratches or cracks and the like is realized; by adopting an in-situ hybridization strategy, SiO2 particles are uniformly generated and stably dispersed in a polyurethane matrix to form a compact and synergistically enhanced composite network structure, so that excellent optical performance is maintained while functionality is achieved, and the power generation efficiency of a photovoltaic module is favorably improved; by adjusting the hydrophobicity of the surface of the coating, the super-hydrophobic effect is achieved; the preparation method is mild in process conditions.

The invention discloses a PEM proton exchange membrane for water electrolysis and a preparation method thereof, and relates to the technical field of water electrolysis. The proton exchange membrane is composed of five layers of structures including a modified sulfonated composite resin layer, an enhancement layer, a water retention layer, a catalyst layer and an anti-permeation layer, the preparation method comprises the following steps: the modified sulfonated composite resin layer is prepared by dispersing perfluorinated sulfonic acid resin and sulfonated lignin in a solvent, coating and drying; the reinforcing layer is prepared by blending a PTFE (Polytetrafluoroethylene) emulsion, a carbon nanotube and a tetrafluoroethylene-hexafluoropropylene copolymer, and then carrying out casting sintering, plasma treatment and hot press molding; the water retention layer is prepared by adopting an electrostatic spinning technology; the catalyst layer is formed by spraying a precursor solution step by step and drying; the anti-permeation layer is prepared through photoetching-etching array construction, resin coating and fluorosilane modification. The prepared proton exchange membrane has excellent mechanical strength, proton conductivity and stability, and is suitable for the field of PEM water electrolysis.

The invention provides an aluminum profile electrophoresis finishing surface treatment process which comprises the steps that S1, an aluminum profile is sequentially pretreated, and pretreatment comprises degreasing, acid pickling, alkali etching, neutralizing and water washing treatment; s2, the pretreated aluminum profile is immersed in electrophoresis tank liquid, and direct-current voltage is applied; wherein the electrophoresis tank liquid is composed of acrylic resin, epoxy resin, deionized water and a curing agent, the solid content is 10%-15%, the pH value is 5.5-6.5, the direct-current voltage is 80-120 V, the electrophoresis time is 2-4 minutes, the temperature of the electrophoresis tank liquid is controlled to be 25-30 DEG C, and the thickness of an electrophoresis film is 15-25 microns; and S3, the aluminum profile subjected to electrophoresis is sequentially subjected to liquid draining, water washing, baking and curing treatment. Electrophoretic coating is carried out after pretreatment, the adhesive force of a coating reaches 4B or above by using a composite resin system in the electrophoretic coating, the thickness uniformity of an electrophoretic film is improved during electrophoresis, and the cracking resistance and the hardness of the coating are improved through subsequent baking treatment.

The present invention relates to a preparation method for a silicon-carbon composite negative electrode material, comprising the following steps: (P1) co-polymerization: co-dissolving an unsaturated organic acid, an acrylate monomer and an acrylamide monomer in water at a specific ratio, and co-polymerizing same under the action of a sacrificial agent of a saturated organic acid and an initiator to obtain a suspension containing an acrylic copolymer; (P2) alkali treatment: performing an alkali treatment and filtration on the suspension to obtain copolymer particles; (P3) in-situ polymerization: performing in-situ polymerization of phenolic aldehyde on the surfaces of the copolymer particles to obtain a composite resin of a phenolic aldehyde-coated acrylic copolymer; (P4) heat treatment: performing a heat treatment on the composite resin in an oxidizing gas atmosphere to obtain porous carbon; and (P5) performing silicon deposition and carbon coating on the porous carbon to obtain the silicon-carbon composite negative electrode material. When the silicon-carbon composite negative electrode material prepared in the present invention is used in a lithium battery, the volume expansion of silicon can be effectively relieved, and the cycling performance and charge-discharge capacity of a lithium-ion battery are improved.

The invention discloses a low-temperature curable bismaleimide resin-based composite material surface film and a preparation method thereof, relates to the field of bismaleimide resin composite material surface films, and aims at solving the problem that the curing temperature of an existing bismaleimide resin composite material surface film is too high. The surface film is composed of bismaleimide resin, an allyl compound, thermoplastic resin, a catalyst and a fluidity control agent. The preparation method comprises the following steps: adding the allyl compound into a reaction kettle, heating and stirring, adding the thermoplastic resin, cooling, adding the bismaleimide resin, continuously heating and stirring, and carrying out double-roller hot rolling film forming on the bismaleimide resin and a carrier for manufacturing an adhesive film through an adhesive film machine to prepare the low-temperature curable bismaleimide resin surface film.

The invention relates to a composite resin material for 3D printing and a preparation method thereof. The material is prepared from the following raw materials in parts by weight: 60-90 parts of polylactic acid, 5-15 parts of a toughening agent, 5-15 parts of a flame retardant, 5-10 parts of modified carbon nanotubes, 0.3-1 part of an anti-hydrolysis agent and 0.3-0.5 part of a lubricant. The flame retardant is added, a phosphate structure, a benzene ring and a hindered phenol structure are introduced into 5, 5 '-dibromo-[2, 2'-bipyridyl]-3, 3 '-diamine, and efficient flame retardance is achieved and the anti-aging performance of the composite resin material is enhanced through multiple synergistic effects of hindered phenol-phosphorus heterocycle-bipyridyl. The modified carbon nanotube is added as a reinforcing agent, so that the mechanical property of the composite resin material is remarkably improved, and the composite resin material is endowed with antibacterial property.

The invention discloses an environment-friendly odorless sealing strip adhesive as well as preparation and application thereof, and the environment-friendly odorless sealing strip adhesive is prepared from the following components in parts by mass: 15 to 20 parts of polyacrylate resin, 10 to 15 parts of dammar resin, 5 to 10 parts of fir resin, 3 to 5 parts of hydrogenated terpene resin, 2 to 5 parts of tributyl citrate and 45 to 65 parts of n-decane. The preparation method comprises the following steps: uniformly mixing natural resin (dammar resin, fir resin and hydrogenated terpene resin), polymeric monomers (n-octyl acrylate, methyl methacrylate and hydroxyethyl acrylate) and an environment-friendly solvent (n-decane), and then polymerizing to obtain the environment-friendly adhesive. The synthetic resin (polyacrylate resin) and the natural resin are sufficiently and mutually dissolved in n-decane to form stable and uniform composite resin glue, so that the problems of health risk and environmental pollution caused by harmful solvents such as xylene in the traditional sealing glue are effectively avoided, and the characteristics of no toxicity, no odor and environmental protection of the product are realized; meanwhile, the stability and the bonding performance of the section sealing glue are improved, the matching performance of the optical transmittance and the refractive index of the section sealing glue is enhanced, and the section sealing glue has quick-drying performance and is suitable for medical pathological sections.

The invention relates to the technical field of anti-corrosion treatment, and provides anti-corrosion molding powder and a radiator anti-corrosion treatment technology.The anti-corrosion molding powder is prepared by taking polyethylene glycol terephthalate as a matrix and cooperating with a TGIC curing agent, phosphoric acid activated bamboo charcoal nanofibers, graphene modified zinc oxide, a lanthanum nitrate and cerous nitrate compound, a silane coupling agent and a functional additive; a composite resin system with a compact nano-structure is prepared through high-speed ball milling pre-activation and a twin-screw gradient extrusion process. The treatment process of the radiator comprises the steps of forming the ceramic substrate layer through micro-arc oxidation, performing dynamic temperature control impregnation with acrylic acid water-based paint, spraying anti-corrosion molding powder, performing microwave infrared gradient curing, and constructing a metal substrate-ceramic layer-organic coating multi-stage protection system. The permeability resistance of the coating is remarkably improved, a continuous and compact composite protection structure is formed, the problems of interface stripping, medium permeation and poor environmental adaptability of a traditional coating are solved, and the coating is suitable for the long-acting anti-corrosion requirement of the radiator under the high-corrosion working condition.

The invention provides an ethylene maleic anhydride copolymer and a preparation and application method thereof, and the preparation method comprises the following steps: dissolving a maleic anhydride monomer in an organic solvent to form a uniformly dispersed solution system, and transferring the solution system into a high-pressure reactor; ethylene gas in a supercritical state is introduced into the solution system of the high-pressure reactor to form a uniform ethylene-maleic anhydride solution system, wherein the pressure of the ethylene gas in the supercritical state is 5-30 Mpa; adding a free radical initiator into the ethylene-maleic anhydride solution system, raising the reaction temperature, and carrying out solution polymerization reaction to obtain a reaction system; a precipitant is added into a reaction system to separate out the ethylene-maleic anhydride copolymer, ethylene and maleic anhydride in the ethylene-maleic anhydride copolymer alternately exist in the form that the molar ratio of ethylene to maleic anhydride is 1: 1, high-performance bonding composite resin can also be formed by blending the ethylene-maleic anhydride copolymer and polyethylene, and the high-performance bonding composite resin is suitable for the fields of adhesives, coatings, composite materials and the like.

The invention discloses a utilization method of a waste carbon fiber reinforced resin-based composite material and a belt mortar type rubbing and grinding activation machine, and belongs to the field of waste recycling. Carrying out rubbing friction catalysis and ultrasonic piezoelectric catalytic activation on the waste carbon fiber reinforced resin-based composite material and the barium titanate turbid liquid by adopting a rubbing and grinding activation machine with a mortar, then spraying an activating agent solution, and continuously soaking, rubbing and activating to obtain the modified waste carbon fiber reinforced resin-based composite material. And carrying out variable-pressure gradient heating carbonization activation to prepare the activated carbon barium titanate composite adsorption catalyst. According to the method, barium titanate piezoelectricity and friction catalysis coupled mechanical rubbing are adopted to activate a carbon fiber reinforced resin-based composite material, the stability of the carbon fiber reinforced resin-based composite material is reduced, the difference between carbonization activation conditions and performance of resin and carbon fibers is reduced, carbonization is controlled by adopting pressure transformation and temperature combination, and the activated carbon barium titanate composite adsorption catalyst is obtained. The method can be used for treating heavy metal-containing organic wastewater, new pollutant wastewater and waste gas.

The invention discloses a cement-enhanced super-hydrophobic self-adaptive temperature control coating which comprises a thermochromic bottom layer and a radiation refrigeration surface layer, a primer adopted by the thermochromic coating is prepared from the following components in parts by weight: 3 to 6.6 parts of composite resin matrix, 0.4 to 1.2 parts of filler, 11 to 15 parts of thermochromic powder and 10 to 15 parts of organic solvent; and finish paint adopted by the thermochromic coating is prepared from the following components in parts by weight: 50 to 55 parts of SiO2 dispersion liquid, 2 to 9 parts of white cement slurry, 5 to 8 parts of hydrophobic modifier, 6 to 10 parts of low-surface-energy substance and 7 to 11 parts of migration-anchoring dual-function additive. The coating system disclosed by the invention can realize efficient cooling in a high-temperature environment, can keep thermal insulation performance in a low-temperature environment, has mechanical stability and self-cleaning performance required by long-term outdoor application, and is wide in applicability.

The invention discloses a high-performance super-hydrophobic coating, and relates to the technical field of coating preparation. The high-performance super-hydrophobic coating comprises a composite resin matrix composed of polyurethane and polyethersulfone, and zinc selenide nanoparticles and hydrophobic modified inorganic micro-nanoparticles used for constructing a super-hydrophobic surface are dispersed in the composite resin matrix. Polyether sulfone has good tolerance, can significantly improve the thermal stability and structural strength of the coating in a high-temperature environment, and can be blended and crosslinked with a polyurethane network to form a more stable multiphase composite system, enhance the crack resistance and peel strength of the coating, and effectively improve the adhesive force; the zinc selenide nanoparticles can effectively absorb ultraviolet rays and protect the organic resin matrix from being damaged by ultraviolet radiation. The high-performance super-hydrophobic coating provided by the invention is suitable for outdoor severe environments with high temperature, strong ultraviolet radiation and chemical corrosion risk, and long-term stable protection can be provided for outdoor equipment by coating the surface of the outdoor equipment with the high-performance super-hydrophobic coating to form a protective coating.

The invention discloses a high-weather-resistance composite modified road hot-melt coating and a low-temperature preparation process thereof, and relates to the technical field of road engineering materials. Comprising 35-50 parts of a composite resin matrix, 15-20 parts of a gradient interface reinforcing agent, 18-25 parts of a nano composite filler, 8-12 parts of a low-temperature toughening network agent and 5-8 parts of a dynamic self-repairing agent. The material still keeps high elongation at break at-30 DEG C through the composite resin matrix, interface modified filler is prepared through the gradient interface reinforcing agent and the nano composite filler, interface bonding strength is enhanced, filler agglomeration is prevented, coating master batch is combined with the dynamic self-repairing agent, and the dynamic self-repairing coating has the advantages that the dynamic self-repairing coating has excellent mechanical properties, and the service life of the dynamic self-repairing coating is prolonged. The dynamic self-repairing capability is realized, and the service life is prolonged.

The invention provides a low-dielectric high-toughness alkali-free spherical glass powder modified copper-clad plate. The low-dielectric high-toughness alkali-free spherical glass powder modified copper-clad plate consists of a composite resin matrix, modified alkali-free spherical glass powder, a synergistic functional filler, an auxiliary agent, a reinforced base material and a conductive layer, the modified alkali-free spherical glass powder is subjected to gradient treatment of plasma activation, silane grafting and organic silicon coating, the particle size of the modified alkali-free spherical glass powder is 0.5-2 microns, the modified alkali-free spherical glass powder accounts for 10-20 parts by weight in the raw materials, and the content of organic functional groups on the surface of the modified alkali-free spherical glass powder is larger than or equal to 1.6 mmol / g.The invention further provides a preparation method of the low-dielectric high-toughness alkali-free spherical glass powder modified copper-clad plate. Compared with the prior art, the preparation method has the following beneficial effects that a double-resin blending and elastomer toughening system is constructed through a modification process of filler activation, silane grafting and organic silicon coating, and the technical bottleneck is solved in combination with an interface compatibility technology.

The invention provides a synthetic method and application of pure water-based acrylic resin. The preparation method comprises the following steps: firstly, esterifying acrylic acid and fatty alcohol to prepare an acrylate monomer with a flexible chain segment and hydrophilic-hydrophobic balance; then, acrylic ester and diethanol amine are subjected to aminolysis to generate a hydroxyl-containing acrylamide derivative, hydroxyl and trimethylolpropane ester exchange is carried out to form a branched node, and the crosslinking potential of a molecular chain is increased; the hydroxyl group and the isocyanate group are combined to generate a carbamate hard segment and construct a hyperbranched skeleton, and meanwhile, double bonds are reserved for subsequent free radical polymerization; and finally, copolymerizing the flexible monomer, the hyperbranched hard-segment monomer and hydroxyethyl acrylate to form the composite resin containing high-density hydroxyl groups, wherein the soft and hard segments of the composite resin are microphase-separated. The pure water-based acrylic resin prepared by the invention has excellent adhesive force, weather resistance, solvent resistance and the like, is applied to baking varnish, effectively improves the performance of the baking varnish, and has the characteristics of being green and environment-friendly.

The invention relates to the technical field of flame-retardant materials, in particular to a ceramic fiber composite resin fireproof flame-retardant material and a preparation method and application thereof. The ceramic fiber composite resin fireproof flame-retardant material comprises a ceramic fiber fireproof layer and a continuous glass fiber RTM (Resin Transfer Molding) layer, the ceramic fiber fireproof layer comprises fireproof ceramic fibers and nano oxide / modified nano oxide, and the surface of the ceramic fiber fireproof layer is subjected to plasma activation operation and silane coupling agent treatment. The ceramic fiber composite resin fireproof flame-retardant material has an excellent thermal runaway protection effect, and the bonding effect between the ceramic fiber fireproof layer and the continuous glass fiber RTM layer is excellent.

The invention discloses modified epoxy resin suitable for oven forming and a preparation method and application thereof, and belongs to the technical field of resin-based composite materials. The modified epoxy resin comprises the following raw materials in parts by mass: 45-60 parts of bisphenol A epoxy resin; 10 to 15 parts of glycidyl amine tetrafunctional epoxy resin; 15 to 20 parts of glycidyl ester type trifunctional epoxy resin; 10 to 16 parts of a toughening agent; 40 to 45 parts of 4, 4 '-diaminodiphenyl sulfone; the toughening agent is thermoplastic phenolphthalein polyaryletherketone resin or thermoplastic phenolphthalein polyethersulfone resin, and the obtained modified epoxy resin has similar viscosity-temperature characteristics, highest exothermic temperature and relatively long gelation time as MTM45-1 oven molding resin applied in airbus certification, and is suitable for being used in preparation of oven molding prepregs. And the obtained oven molded prepreg has good stability, and the difference of products in each batch is small.

The invention discloses a field plowing rotary cultivator, which relates to the technical field of agricultural machinery and comprises a machine body frame, a gearbox is fixedly connected to the interior of the machine body frame, and two connecting seats are fixedly connected to the surface of one side of the machine body frame. In the embodiment, the machine body frame is in three-point suspension connection with the tail of a tractor through the connecting seat, the input end of the gearbox is connected with the output end of the tractor, the transmission shaft drives the rotary blade to turn soil, the bearing seat supports the transmission shaft to avoid vibration, the baffle prevents soil from splashing, and the rotary blade is made of silicon nitride ceramic matrix composite materials and is reinforced by adding carbon fibers. The machine body frame is made of a high-performance resin-based composite material and a mixed reinforced material of modified epoxy resin, modified glass fibers and modified aramid fibers, and compared with a traditional metal frame, the machine body frame has the advantages that the weight is reduced, excellent corrosion resistance is achieved, rust-proof treatment is not needed, and the service life is prolonged. The device can be used for a long time in a humid and muddy field environment without being damaged.

The invention discloses a nano titanium dioxide composite resin material and a preparation method thereof, and belongs to the technical field of composite materials. The material is composed of an epoxy resin material, nano titanium dioxide, a dispersing agent, a coupling agent, rubber powder, calcium carbonate, a specific structure stabilizer and a curing agent, the stabilizer comprises aromatic rings and alkyl / deuterated alkyl substituent groups, interface bonding force is enhanced through pi-pi accumulation, hydrogen bonds and a dynamic stabilization effect, agglomeration of nano particles is inhibited, and the stability of the material is improved. The thermal stability and the ultraviolet aging resistance of the material are synergistically improved. The preparation method comprises the following steps: pretreating the raw materials, modifying the surface of the nano titanium dioxide through a coupling agent, uniformly dispersing all the components by adopting shear emulsification and vacuum stirring, and performing staged curing molding. By optimizing the component synergistic effect and process parameters, the mechanical strength, impact resistance and weather resistance of the material are remarkably improved, the curing efficiency is high, the process stability is high, and the method is suitable for large-scale production.