2436 results about "Phenol formaldehyde resin" patented technology

The invention discloses an integrated preparation method of a SiC-based composite material environment barrier coating in the technical field of aviation thermal structure materials, which comprises the following steps: cleaning a substrate, carrying out vacuum impregnation of phenolic resin and curing, coating Si slurry to form a bonding layer, coating rare earth silicate slurry to form a barrier layer, and drying to obtain the SiC-based composite material environment barrier coating. And finally carrying out high-temperature heat treatment in an inert atmosphere. According to the method, through an integrated slurry coating and gradient curing process, the performance of a base body is protected, and meanwhile efficient preparation of the coating is achieved; by adopting an integrated slurry coating and gradient curing technology and combining with an optimized medium-temperature sintering process, the matrix performance is effectively protected while the compactness of the coating is ensured, the bonding strength and interface stability of the coating are improved through the design of the phenolic resin transition layer and the silicon bonding layer in cooperation with the rare earth silicate barrier layer, and the bonding strength of the coating is improved. And the coating shows excellent protection performance in a high-temperature corrosion environment.

The invention relates to the technical field of friction materials, and particularly discloses an electromagnetic brake friction material prepared from granules and a preparation process of the electromagnetic brake friction material in order to solve the problem that an existing electromagnetic brake friction plate is difficult to prepare or insufficient in performance. The reinforcing material comprises plasma modified aramid pulp, coupling modified composite mineral fibers, SiO2 coated tetrapod-like zinc oxide whiskers and carbon fiber-aluminum silicon whiskers; the filler comprises modified needle-like wollastonite and organic modified precipitated barium sulfate; the adhesive comprises boron-silicon synergistic modified phenolic resin and modified carboxy nitrile rubber. The raw materials are improved, and granules are prepared by adopting a mixing and crushing process, so that the content of an adhesive can be greatly reduced, meanwhile, the die filling efficiency can be improved, the die thickness and the high-temperature heat fading of the friction material can be reduced, a cold press molding process can be omitted, and the qualification rate of finished friction materials can be improved.

The invention relates to a magnesia-carbon refractory material with high thermal shock resistance and erosion resistance and a preparation method thereof. The magnesia-carbon refractory material with high thermal shock resistance and erosion resistance is prepared from fused magnesia aggregate, fused magnesia fine powder, silicon powder, crystalline flake graphite, Al2O3-MgO-CaO core-shell structure raw materials and phenolic resin. The Al2O3-MgO-CaO core-shell structure raw materials are prepared by the following steps: uniformly mixing calcium carbonate, magnesium hydroxide and alumina micro powder by adopting a planetary ball mill, and then carrying out granulation treatment by adopting a disc granulator by taking polyvinyl alcohol as a binding agent, so as to obtain core particles; and mixing the inner core particles and the alumina micro powder by taking alumina sol as a binding agent, and further sintering to obtain the core-shell structure raw material. The Al2O3-MgO-CaO core-shell structure raw material is utilized to improve the comprehensive performance of the magnesia-carbon refractory material, and the prepared magnesia-carbon refractory material has excellent thermal shock resistance and slag corrosion resistance and can meet the requirements of the current steel industry for the magnesia-carbon refractory material.

The invention belongs to the technical field of protective coatings, and discloses an anti-corrosion, wear-resistant and high-temperature-resistant coating as well as a preparation method and application thereof. The coating comprises a primer, a middle transition layer and a finish; the raw materials of the primer comprise a primer material and a primer curing agent component; the primer material comprises modified epoxy phenolic resin, a primer functional filler, a first mixed solvent, a high-temperature-resistant coupling agent and an anti-settling agent; the raw materials of the middle transition layer comprise a middle transition layer material and a middle curing agent component; the materials of the middle transition layer comprise polyimide modified epoxy resin, a wear-resistant filler, a reactive diluent, a carbon nanotube, a first dispersant and a compatilizer; the raw materials of the finishing paint comprise a finishing paint material and a finishing paint curing agent component; the finishing paint material comprises organic silicon modified fluorocarbon resin, finishing paint functional filler, a second mixed solvent, a second dispersing agent and a flatting agent. According to the invention, a resin-based composite coating system is synergistically designed through multi-phase materials, so that optimal balance of corrosion resistance, wear resistance, toughness and high temperature resistance of the coating is realized.

The invention relates to the technical field of phenolic resin production monitoring, and discloses a phenolic resin production abnormity monitoring method and system fused with machine learning. The method comprises the following steps: acquiring a real-time production data set, and identifying production environment parameters and the number of reaction stages; a normal monitoring model is set based on the parameters and the number, the relative position of the reaction stage is positioned, and an operation monitoring mode is determined by combining real-time data; then identifying a key reaction stage and a monitoring position, constructing a side parameter prediction network and setting an abnormity recovery rule; sensing the operation state of the equipment in combination with the operation monitoring mode and the exception recovery rule, and analyzing the environment change trend to set an exception sensing mode; identifying an abnormal production condition based on an abnormal perception mode, and combining a side parameter prediction network to set a single-stage de-trapping mechanism; and finally, performing exception monitoring processing according to an exception sensing mode, a single-stage de-trapping mechanism and an exception recovery rule to obtain a result.

The invention relates to the field of materials, in particular to a silicon dioxide aerogel composite thermal insulation material and a preparation method thereof. The silicon dioxide aerogel composite thermal insulation material is prepared by taking silicon dioxide aerogel, phenolic resin, a nano zirconium oxide graft and a locust bean gum graft as main raw materials and taking n-pentane, UV-327, hexamethylenetetramine and an antioxidant 1010 as auxiliary materials. The nano zirconium oxide graft and the locust bean gum graft are added into the silicon dioxide aerogel material, so that the prepared silicon dioxide aerogel composite material has excellent heat-insulating property, flame-retardant property and toughening effect, and the comprehensive requirements of the use scene of the silicon dioxide aerogel composite material on toughness and flame retardance are met; and the application market is expanded.

A high-temperature-resistant and aging-resistant polyurethane material and a preparation method therefor. The polyurethane material comprises the following components in parts by mass: 21-27 parts of a modified polyurethane resin, 10-15 parts of a phenolic resin, 10-15 parts of an epoxy resin, 16-20 parts of a modified solid filler, 7-13 parts of a curing agent, 1-2 parts of a defoaming agent, 1-3 parts of a wetting agent, 0.7-1 part of a leveling agent, and 5-10 parts of water. The high-temperature-resistant and aging-resistant polyurethane material has excellent temperature resistance and moisture resistance, high aging resistance, and strong adhesion to a glass surface and can be used as a coating with which a glass surface is coated.

The invention belongs to the technical field of sodium ion battery hard carbon negative electrode materials, and particularly relates to a phenolic resin asphalt super-crosslinking hard carbon composite active material and a preparation method and application thereof.The preparation method comprises the steps of phenolic resin precursor synthesis, oxidized asphalt precursor synthesis, super-crosslinking reaction and stepped carbonization; the preparation method comprises the following steps: reacting phenol with formaldehyde under the action of a catalyst to obtain a phenolic resin precursor; pre-oxidizing the coated asphalt in an air atmosphere to generate an asphalt precursor; the preparation method comprises the following steps: mixing a phenolic resin precursor with an asphalt precursor, adding an acid catalyst into an organic solvent, and performing reflux heating to form a chemically bonded three-dimensional cross-linked network structure; and sequentially carrying out low-temperature pre-carbonization and high-temperature carbonization in an inert gas atmosphere to obtain a target product, namely the hard carbon composite material. The target product provided by the invention has rich closed pore and multistage through pore structure hard carbon, and the sodium storage capacity of the hard carbon material is effectively improved.

The invention provides a phenolic resin-based spherical silicon-carbon composite material as well as a preparation method and application thereof, and belongs to the technical field of lithium battery materials. The preparation method comprises the following steps: preparing spherical phenolic resin by adopting a suspension polymerization method, curing to obtain phenolic resin microspheres, preparing porous carbon spheres by taking the phenolic resin microspheres as a carbon precursor in a carbonization and alkali activation manner, carrying out CVD vapor deposition on nano silicon, and carrying out carbon coating to obtain the phenolic resin-based spherical silicon-carbon composite material. The phenolic resin is utilized to form a highly cross-linked network structure after curing, the carbon spheres obtained after carbonization have good mechanical strength and rigidity, the porous structure of the porous carbon spheres provides a volume change buffering structure for nano-silicon, the lithium ion path is shortened, the spherical structure is beneficial to uniform dispersion, nano-silicon particles are prevented from gathering, and the performance of the lithium ion battery is improved. And the porous carbon spheres with high specific surface area can also improve the interface reaction activity, so that the problems of high volume expansion, low conductivity and slow ion diffusivity of silicon are solved.

The invention belongs to the technical field of 3PE corrosion prevention, and particularly relates to a high-temperature-resistant and cathodic disbonding-resistant 3PE corrosion-resistant pipeline and a preparation method thereof. A pipeline epoxy bottom layer, a middle adhesive layer and a polyethylene surface layer are subjected to systematic chemical synergistic modification, specifically, the epoxy bottom layer is modified with phenolic resin and amino silane, and a heat-resistant compact barrier is formed; the middle layer reacts with maleic anhydride grafted polyethylene through amino silane to construct a chemical bridge for simultaneously connecting the upper layer and the lower layer; the surface layer is grafted with high-density polyethylene through fluoroprimary amine modified glycidyl methacrylate, and a hydrophobic and oleophobic chain and a reactive functional group are introduced; according to the structure, through the synergistic effect of the high-temperature stability of the bottom layer, the two-way chemical bridging capacity of the middle layer and the inert hydrophobic characteristic of the surface layer, the long-term use temperature upper limit, the stripping resistance and the medium infiltration resistance of the pipeline are improved, and a solution is provided for long-term protection of the pipeline in the severe environment.

The invention discloses a silicon / graphite / carbon-aluminum oxide composite negative electrode material and a green preparation method thereof, and belongs to the technical field of lithium ion batteries. Aiming at the problems of high volume expansion rate and poor cycling stability of a silicon-based negative electrode and high cost of a traditional process, the invention innovatively provides the following scheme: 1) waste photovoltaic silicon wafer ball-milling liquid and waste graphite are taken as core raw materials, and resource recycling is realized; (2) phenolic resin and chitosan are adopted as double carbon sources, a nitrogen-doped carbon layer (the nitrogen content is 3-5 wt.%) is formed through pH-induced self-assembly, and the conductivity and the Li < + > diffusion rate are synchronously improved; and 3) aluminum nitrate is introduced for pyrolysis to generate 2-5nm aluminum oxide for doping, so that the side reaction of the electrolyte is inhibited, and the volume expansion of silicon is relieved (the expansion rate is less than or equal to 120%). The preparation process comprises the steps of silicon / graphite dispersion, double-carbon-source compounding, ammonia water regulation and control precipitation and gradient calcination. Experiments show that the specific capacity of the optimized material under the current of 0.5 A / g reaches more than 800mAh / g, the 100-time cycle capacity retention ratio is more than 98%, the 1000-time cycle capacity retention ratio is more than 80%, the reversible specific capacity under the multiplying power of 3A / g is more than 550mAh / g, and the raw material cost is reduced by 40%. The invention has the advantages of high capacity, long service life, environmental protection and economy, and provides an innovative solution for the fields of power batteries and energy storage.

The present invention discloses a method for preparing a carbon aerogel material used as a silicon-carbon negative electrode. The method uses phenolic resin as the main raw material and adjusts the pore structure distribution of the carbon aerogel through sol-gel, crushing, drying, grading, carbon activation, impurity removal, grinding and other steps to control the impurity content, ash content, moisture content and particle size distribution, so as to meet the requirements for the use of carbon aerogel in the field of silicon-carbon negative electrodes. The prepared carbon aerogel material has a specific surface area of ​​1000 to 3000 m 2 / g, pore volume is 0.3~2cm 3 / g, with an average pore size of 0.5-10nm and a micropore ratio of 30%-100%, making it a porous carbon matrix material for silicon-carbon anodes. The present invention uses phenolic resin, formaldehyde, potassium hydroxide, and other ingredients as its primary raw materials, resulting in low costs. The materials are graded prior to carbon activation, ensuring controllability and consistency during activation. Furthermore, the impurity removal process is simple, and the overall process is highly efficient, facilitating the large-scale production of carbon aerogel materials.

The invention provides a 180 DEG C-resistant microcapsule type cementing wall-fixing agent for water-based drilling fluid as well as a preparation method and application thereof, and belongs to the technical field of drilling. The preparation method of the wall fixing agent comprises the following steps: (1) respectively adding the macromolecular hydrophilic colloid and the emulsifier into deionized water, and stirring until the macromolecular hydrophilic colloid and the emulsifier are completely dissolved to obtain a water phase; (2) adding phenolic resin, the MUF prepolymer solution and nano SiO2 into an organic solvent under a stirring condition, and uniformly stirring to obtain an oil phase; (3) adding the oil phase obtained in the step (2) into the water phase obtained in the step (1), and carrying out shear emulsification to obtain an oil-in-water emulsion; and evaporating to remove the organic solvent in the system, filtering, washing, and drying to obtain the product. Under the multi-element synergistic effect of hydrogen bonds or coordinate bonds, Van der Waals force and the like, the microcapsule type cementing wall-fixing agent can accelerate the interface to form a compact cemented network structure, the cementing strength of rock particles is remarkably improved, and the purpose of strengthening the stability of a well wall is achieved.

The invention belongs to the field of battery negative electrode materials, and particularly relates to a sodium ion battery hard carbon negative electrode material and a preparation method thereof. The preparation method comprises the following steps: mixing phenolic resin and asphalt, and carrying out pre-oxidation treatment to obtain a pre-oxidized precursor; and under a protective atmosphere, sequentially carrying out pre-carbonization treatment and carbonization treatment on the precursor subjected to the pre-oxidation treatment to obtain the sodium-ion battery hard carbon negative electrode material. In the pre-oxidation process, the asphalt and the phenolic resin are crosslinked, so that the foaming phenomenon of the phenolic resin in the subsequent carbonization process is reduced, the escape of small molecule gas in the phenolic resin is inhibited, the surface defects of the phenolic resin-based derived hard carbon material are further reduced, more closed pores are formed, and the sodium storage performance is improved. Meanwhile, a graphite-like carbon layer formed in the high-temperature carbonization process of the asphalt can be effectively inserted into a rigid framework of the phenolic resin hard carbon to construct a three-dimensional continuous conductive network, so that the electronic conductivity of the phenolic resin-based hard carbon is greatly improved, and the electrochemical performance of the sodium ion battery is improved.

The invention discloses an injection molding high-density alloy steel sintering integrated preparation process, which comprises the steps of alloy raw material proportioning, feed preparation, injection molding, continuous thermal desorption sintering treatment and enhanced heat treatment, and comprises the following steps: selecting gas atomization pure iron powder subjected to vacuum reduction treatment, and matching with chromium, nickel, molybdenum, vanadium, carbon, silicon, manganese and iron powder multi-component alloy proportioning; a phenolic resin-polyformaldehyde composite binder is adopted, 0.5-1.5% of a lubricating additive is added, internal mixing parameters are controlled under the protection of inert gas according to the powder-to-rubber ratio of 72-77%: 23-28%, and the problem that the compatibility of a single binder and alloy powder is poor is solved; three-section gradient temperature control injection molding and a continuous atmosphere furnace sectional degreasing-sintering integrated process are combined, and strengthening heat treatment is matched, so that sufficient diffusion of elements and densification of a green body are realized, and defects are avoided. The technology effectively solves the technical problems that traditional raw materials are high in impurity content and insufficient in element diffusion, and therefore the alloy steel sintering preparation efficiency can be improved.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of a graded ordered silicon-carbon negative electrode material for a lithium ion battery, which comprises the following steps: (S1) mixing phenolic resin and a template agent, calcining, and etching to obtain porous carbon containing macropores; (S2) carrying out cracking and carbon coating on the silicon source gas to obtain nano crystalline silicon containing a carbon coating layer; (S3) mixing the porous carbon with the nano crystalline silicon containing the carbon coating layer, and then carrying out ultrasonic vibration, so that macropores of the porous carbon are filled with the nano crystalline silicon to obtain a silicon-carbon composite material I; (S4) treating the silicon-carbon composite material I by using a carbon-containing sealing agent, and then activating to obtain a silicon-carbon composite material II; and (S5) carrying out vapor phase silicon deposition on the silicon-carbon composite material II to fill the amorphous silicon in the pores of the porous carbon, and then carrying out carbon coating to obtain the graded ordered silicon-carbon negative electrode material. The silicon-carbon negative electrode material prepared by the invention is of a composite structure in which crystalline silicon and amorphous silicon are spatially and orderly distributed, so that the structural stability and the uniform distribution of silicon are realized.

The invention discloses a phenolic resin-based hard carbon microsphere material as well as a preparation method and application thereof. The hard carbon microsphere material is synthesized through high-temperature carbonization of a block copolymerization cross-linked network of phenolic resin and natural starch. The phenolic resin provides a highly cross-linked carbon network, and the addition of the starch regulates and controls the internal pore structure of the microsphere material, so that the obtained hard carbon material has appropriate carbon layer spacing and optimized surface defects. Besides, by reasonably controlling a carbonization process, the material can form a rich closed pore structure, so that the problem of volume expansion in the embedding / de-embedding process of sodium ions is effectively relieved, and the cycling stability and the sodium storage capacity of the material are improved. The method is easy to expand and suitable for large-scale production, the used raw materials are cheap and easy to obtain, and the method has the remarkable cost advantage. Meanwhile, excellent electrochemical performance can be achieved, and the material is suitable for being applied to negative electrodes of large-scale energy storage devices and has wide industrial application prospects.

The invention relates to the technical field of preparation and purification of phenolic resin, and discloses a phenolic resin impurity separation device for production, which comprises a filter chamber, an inner cylinder is fixedly mounted in the filter chamber, a steam clamping cavity is arranged between the inner wall of the filter chamber and the outer wall of the inner cylinder, and a mixing chamber is fixedly mounted on the upper side in the inner cylinder. A centrifugal cylinder is movably installed on the lower side of the interior of the inner cylinder, a filter screen is fixedly installed at the bottom end of the mixing chamber, a three-phase asynchronous motor is fixedly installed in the middle of the top end of the filter chamber, and the driving end of the three-phase asynchronous motor extends into the filter chamber and is fixedly provided with a movable shaft; and a spiral paddle is fixedly mounted on the outer diameter section, positioned in the mixing chamber, of the movable shaft. According to the invention, the period is shortened through temperature control, energy conservation and enhanced mixing, the purity is improved through multi-stage separation, the labor is reduced through automatic operation, the structure is exquisite, the adaptability is wide, and the phenolic resin impurity separation efficiency and quality are comprehensively improved.

The application belongs to the technical field of functional resin, and particularly relates to a novel modified phenolic resin with high heat resistance, preparation and application thereof. The thermoplastic phenolic resin is modified by 4,4'-diaminodiphenyl methane (MDA) to improve the heat resistance of the phenolic resin. The obtained modified phenolic resin has excellent heat resistance, and when the modified phenolic resin is applied to a friction material as a binder, the wear rate of the friction material at high temperature is greatly reduced, and the service life of the friction material is prolonged.

The cBN resin superhard grinding wheel is prepared from the following raw materials in percentage by mass: 30 to 45 percent of cBN grinding material, 1 to 3 percent of nano yttrium oxide, 2 to 3 percent of nano zirconium oxide, 2 to 4 percent of coupling agent, 1 to 3 percent of silicon dioxide compound and the balance of phenolic resin. The phenolic resin matrix is jointly modified by the nano yttrium oxide, the nano zirconium oxide and the specific silicon dioxide compound, and the prepared grinding wheel has good wear resistance, hardness and temperature resistance.

The invention relates to the technical field of electronic packaging materials, in particular to a phthalonitrile modified thermosetting resin composition containing a siloxane structure and application of the phthalonitrile modified thermosetting resin composition in the electronic packaging materials. The composition comprises multifunctional epoxy resin, XYLOK phenolic resin, a curing accelerator, a modifier and an inorganic filler, and the modifying agent is eugenol phthalonitrile trisiloxane. The modifier disclosed by the invention has good mechanical compatibility and dispersity in matrix resin; when the epoxy resin is applied to a thermosetting resin system, the processability can be improved, and the toughness of a cured product can be effectively improved while the glass-transition temperature is increased, so that the cured product has excellent bending property; the composition has excellent thermal stability, low bending modulus, good impact performance and humidity and heat resistance after being cured, the glass transition temperature of the composition is effectively improved, the comprehensive performance of resin is remarkably improved, and the composition is suitable for improving the packaging reliability and environmental stability of semiconductor devices.

Provided is a heat-curable acrylic resin composition which is capable of suppressing the generation of ultra-fine bubbles when cured under heat and pressure, and which has excellent adhesiveness. A thermosetting acrylic resin composition which contains (A) an acrylic copolymer having a carboxyl group and (B) a phenolic resin, and which is characterized in that: when the acrylic copolymer (A) is an acrylic copolymer (A-1) having a glass transition temperature of-35 DEG C or less, the phenolic resin (B) is a phenolic resin; the thermosetting acrylic resin composition contains a specific content of an epoxy curing agent (C-1), contains a specific content of a novolac phenolic resin (B-1) or a self-crosslinking phenolic resin (B-2) as the phenolic resin (B), and contains a specific content of a novolac phenolic resin (B-1) or a self-crosslinking phenolic resin (B-2) when the novolac phenolic resin (B-1) is contained as the phenolic resin (B). The thermosetting acrylic resin composition also contains a specific content of an amine curing agent (C-2).

The invention discloses an epoxy powder coating and a preparation method thereof, and belongs to the technical field of powder coating production, firstly, the epoxy powder coating is prepared from the following raw materials in parts by mass: 100 parts of epoxy resin, 15-20 parts of modified phenolic resin, 12-15 parts of carboxyl-terminated polyester resin, 4-8 parts of nano cerium oxide coated mica, 1.5-2.0 parts of a flatting agent and 0.5-1.0 part of benzoin; the modified phenolic resin is prepared by carrying out addition on bisphenol A phenolic resin and DOPO, neutralizing and carrying out reduced pressure distillation; the carboxyl-terminated polyester resin is prepared by carrying out esterification polycondensation on terephthalic acid, isophthalic acid, neopentyl glycol and trimethylolpropane, and then modifying by trimellitic anhydride; the nano cerium oxide coated mica is prepared by coating white mica powder with cerium oxide precipitate, and then carrying out surface treatment and crushing.

The invention relates to the technical field of refractory materials, in particular to an antioxidant and application thereof in steel ladle slag line bricks, and the antioxidant comprises a Si / SiC multiphase material, modified nano Al2O3 and CaF2; the ladle slag line brick comprises an antioxidant, fused magnesite, crystalline flake graphite and phenolic resin. Si-SiC compound waste is subjected to magnetic separation and acid pickling, then a SiO2 passivation layer is formed through pre-oxidation, moisture and air in the storage period are isolated, and a titanate coupling agent is introduced to improve the wettability and compatibility with phenolic resin. P2O5 released by phosphate on the surface of the modified nano Al2O3 at a high temperature reacts with alkali (earth) metal migrated to a SiO2 oxide layer to prevent the alkali (earth) metal from forming a low-melting-point eutectic substance, CaF2 reacts with SiO2 along with temperature rise, a passivation layer is broken, internal Si and SiC are directly exposed, and boron oxide of the modified nano Al2O3 remarkably reduces activation energy and a temperature threshold value of the reaction of CaF2 and SiO2.

The present invention provides a high-efficiency flame-retardant board and a preparation method thereof, relating to the technical field of flame-retardant boards. The board comprises the following components, by weight: 80-250 parts of reinforcing fiber cloth; 60-95 parts of boron phenolic resin; 40-70 parts of alcohol; 5-45 parts of magnesium hydroxide; 5-15 parts of ceramic filler; and a silicate and a catalyst. In the present invention, under the premise of ensuring an optimal silicate hydrolysis degree of 20%-40%, the amount of silicate used is accurately calculated based on the water content of the phenolic resin, the number-average molecular weight of the silicate, and the average degree of polymerization of the silicate, thereby reasonably setting the ratio of silicate to phenolic resin. The silicate is then further hydrolyzed with an acidic catalyst, resulting in a smooth and easy-to-control reaction process. The resulting resin material has both strength and heat resistance. After being uniformly mixed with an inorganic flame-retardant component, the board is impregnated with the reinforcing fiber cloth and pressurized to obtain a high-efficiency flame-retardant board. The overall preparation process is simple, the amount of raw materials used is precisely and reasonably controlled, and the board is particularly suitable for large-scale industrial promotion.

The invention relates to the technical field of porous carbon materials, and discloses a preparation method of phenolic resin-based porous carbon based on synergistic activation of water vapor and carbon dioxide. The key point of the method is to construct a multi-dimensional process of'ZIF-8 (at) Ni-MOF derived bifunctional material pore forming-nitrogen / nickel co-doping + dynamic pressure-double-gas synergistic etching + Ti < 3 > C < 2 > T < x > MXene gradient modification '. The MOF derivative material provides regular initial pore channels and active sites, and precise customization of the pore diameter of 0.7-50 nm is realized by combining dual-gas characteristic complementation and dynamic pressure regulation and control; and MXene modification synchronously improves the conductivity and the interface bonding force. The micropore rate is greater than or equal to 88%, the specific surface area is greater than or equal to 2200m < 2 > / g, the total pore volume is greater than or equal to 1.3 cm < 3 > / g, and the process is free of chemical waste liquid pollution. When the material is applied to a lithium battery silicon-carbon negative electrode, the capacity retention rate after 500 cycles is greater than or equal to 85%, and the industrialization value is high.

The invention relates to the technical field of battery negative electrode materials, in particular to irregular spherical porous carbon and a preparation method and application thereof, and a silicon-carbon composite material and a preparation method and application thereof. The liquid phenolic resin is emulsified, compounded, cross-linked and cured under the condition of an oil-soluble and water-soluble compound emulsifier, meanwhile, the shape of the obtained resin is changed in an ultrasonic-assisted mode under the combined action of ultrasonic disturbance and different interfacial tensions, spherical resin is adjusted into irregular spherical resin, and the spherical resin is prepared into the irregular spherical resin. And performing pyrolysis and gas activation to obtain the irregular porous spherical carbon. Compared with spherical carbon, the irregular spherical carbon prepared by the invention has the advantages that on the premise of keeping the strength of the spherical carbon, the irregular spherical carbon can increase the contact area between carbon particles and a binder, and the carbon particles and the binder are not easy to separate, so that the cycling stability of a battery (especially a lithium ion battery) is improved.

The invention provides a treatment method for recovering high-purity graphite from black powder leaching residues. The treatment method comprises the following steps: removing impurity elements in graphite from the black powder leaching residues in a Joule heat flash evaporation manner; the black powder leaching residues obtained after impurity removal are put into a ball mill, liquid phenolic resin is added, full mixing is conducted, and ball milling is conducted; and putting the ball-milled mixture into flash evaporation Joule thermal equipment, and carbonizing and graphitizing the phenolic resin to obtain regenerated graphite. According to the method, the temperature of the black powder leaching residues can be increased within an extremely short time, metal impurities in the black powder leaching residues are gasified, and impurities in graphite are removed. Phenolic resin is used for carbonization and graphitization, generated disordered carbon can fill up particle cracks in waste graphite and internal lattice defects, a conductive network among graphite particles is established, a compact carbon layer is formed on the surface of graphite, and graphite structure transformation can also be induced in the step. The regenerated graphite obtained by the method is similar to commercial graphite in capacity and good in cycling stability.

The invention relates to the technical field of sodium ion batteries, and discloses plant tar phenolic resin in-situ modified asphalt and a method for preparing a hard carbon material by using the plant tar phenolic resin in-situ modified asphalt. The preparation process of the method comprises the following steps: (1) mixing and dispersing; (2) carrying out hydrothermal polymerization; and (3) high-temperature carbonization. The plant tar is used as a raw material, low-cost phenolic resin is prepared through a hydrothermal reaction, asphalt molecules are doped in situ in the synthesis process, the asphalt molecules participate in the cross-linking process, a more complex mixed polymer is formed, the graphitization process in the high-temperature carbonization process is inhibited, and the high-performance phenolic resin is prepared. And finally, the sodium ion battery negative electrode hard carbon material with excellent sodium storage capacity and good cycle performance is prepared. The raw materials are wide in source, the production cost of the hard carbon material is remarkably reduced, the method has a wide mass production prospect, and an economical and efficient technical scheme is provided for industrial application of the hard carbon material.

The invention relates to the technical field of sand mold casting, and particularly discloses a gradient exhaust sand mold for an aluminum alloy thin-walled workpiece and a preparation method thereof.The sand mold comprises a cavity surface layer (with the hardness ranging from 90 HB to 95 HB), a transition layer (with the hardness ranging from 80 HB to 70 HB and a back sand layer (with the hardness ranging from 60 HB to 65 HB) which are arranged from inside to outside, and microporous ceramic exhaust rods (with the diameter ranging from 0.3 mm to 0.8 mm and the distance ranging from 1 mm to 3 mm) are embedded in the cavity surface layer; the exhaust rod is composed of a mullite fiber matrix and a nanometer gamma-AlO coating, the porosity is 40-50%, and the exhaust rod penetrates through the back sand layer to form a directional exhaust network. The preparation method comprises the following steps: mixing sand layer by layer (the cavity layer contains 1.0-1.5% of phenolic resin, and the back sand layer contains 0.4-0.6% of resin and 4-6% of starch); when sand is filled to the position 1-3 mm away from the surface of the cavity, an exhaust rod is implanted (the positioning precision is + / -0.1 mm); gradient compaction is carried out (the high pressure of a cavity is 3.0-4.0 MPa, the vibration of a transition area is 20-30 Hz, and the back sand airflow is 0.1-0.2 MPa); and carrying out microwave curing (2.5 to 3.5 kW, 60 to 120 s). The defects of hot cracks and air holes of the thin-wall part (smaller than or equal to 5 mm) are overcome synchronously, and the casting yield is increased to 95% or above.