4305 results about "Phenol formaldehyde resin" patented technology

The invention provides a high-temperature-resistant carbon fiber reinforced phenolic resin composite material and a preparation method thereof. The preparation method comprises the following steps: firstly, carrying out high-temperature oxidation treatment on carbon fibers; secondly, carrying out surface modification on the carbon fibers by using a chemical modifier; then mixing the modified carbon fiber, an antioxidant and a dispersing agent to prepare slurry; performing vacuum filtration on the prepared slurry, and drying to obtain a carbon fiber blank; preparing a phenolic resin infiltration solution, and impregnating the carbon fiber blank with the phenolic resin infiltration solution; and finally, carrying out mold pressing and curing to obtain the high-temperature-resistant carbon fiber reinforced phenolic resin composite The preparation method is simple in required equipment, convenient to operate, stable in process, high in production efficiency and suitable for large-scale industrial production. According to the high-temperature-resistant carbon fiber reinforced phenolic resin composite material prepared by the preparation method, the bonding property between the carbon fiber and the phenolic resin is improved, certain toughness and strength are provided, and meanwhile, the high-temperature-resistant carbon fiber reinforced phenolic resin composite material has the advantages of ablation resistance, good oxidation resistance in a high-temperature environment and the like.

The invention provides a silicon-carbon negative electrode material and a preparation method thereof. The preparation method comprises the following steps: a) mixing a phenol monomer, an aldehyde solution, ammonia water and water, dropwise adding a boric acid solution for reaction, and curing to obtain boron-containing phenolic resin; b) carbonizing the boron-containing phenolic resin obtained in the step a), mixing with alkali, and activating to obtain boron-doped porous carbon; and c) carrying out silicon deposition on the boron-doped porous carbon obtained in the step b) by adopting a gaseous silicon source, carrying out carbon coating by adopting a gaseous carbon source, and cooling to obtain the silicon-carbon negative electrode material. Compared with the prior art, the preparation method provided by the invention has the advantages that a conductive network can be formed by doping the boron element, the electron concentration can be improved, the electron transfer rate is favorably improved, the conductivity of the material is effectively enhanced, and the rate capability of the negative electrode material is effectively improved; meanwhile, the residual carbon rate in the porous carbon preparation process can be greatly increased, and the cost of the whole silicon-carbon negative electrode material is effectively reduced.

The invention relates to the field of friction materials, and discloses a friction material with a stable friction coefficient for an electromagnetic brake and a preparation method of the friction material. An adhesive comprises polysiloxane modified phenolic resin, benzoxazine and butyronitrile rubber powder; the reinforcing material comprises 1414 para-aramid pulp, calcium sulfate whiskers, composite mineral fibers, copper fibers and modified needle-like wollastonite; the friction increasing material comprises macroporous shell activated carbon, friction particles, garnet powder, barite and nano hafnium nitride; the antifriction material comprises graphite fluoride, nylon and composite modified hydroxyl silicate; the composite modified hydroxyl silicate is obtained by modifying hydroxyl silicate with diisocyanate and stearic acid and then compounding silane modified micro-nano calcium carbonate. The friction material provided by the invention is used for improving the braking stability of an electromagnetic brake and reducing equipment vibration.

The invention discloses a preparation method of porous carbon, the porous carbon, a negative electrode material and a secondary battery, the preparation method of the porous carbon comprises the following steps: granulation: drying and granulating a phenolic resin microsphere suspension to obtain powder; nano carbon nanotubes are dispersed in the phenolic resin microspheres; and carbonization: sequentially carrying out secondary curing, pre-oxidation and carbonization on the powder to obtain the porous carbon. According to the preparation method, the porous carbon is prepared by adopting the nanoscale carbon nanotubes, firstly, the conductivity of the porous carbon is favorably improved due to the good conductivity of the carbon nanotubes, and meanwhile, the nanoscale carbon nanotubes are utilized, so that the carbon nanotubes can be more sufficiently dispersed, and the effect of improving the conductivity of the porous carbon by the carbon nanotubes is more favorably exerted; secondly, the tin or germanium element doped into the negative electrode material assists lithium ion deintercalation by reducing lithium ion transition energy barriers, so that the first effect is improved.

The invention provides a silicon-carbon material and a preparation method thereof, a porous carbon substrate, a negative electrode material and a battery, and relates to the technical field of battery materials. The core point provided by the invention is controllable synthesis of the porous carbon substrate in the silicon-carbon material, a phenolic monomer and an aldehyde monomer are polymerized in the presence of a catalyst and a dispersing agent, meanwhile, a doping agent and a pre-carbonized biomass carbon precursor are added into a solution, the phenolic resin formed by polymerization is of a spherical structure, and the silicon-carbon composite material is obtained. Homogeneous doping of elements is completed in the synthesis process, the added biomass carbon precursor is of a blocky structure, matching of carbon-based particles of different structures can better exert respective beneficial effects and complement each other, the battery performance is comprehensively improved, and the battery has excellent cycle performance and conductivity.

An article for joule heating is described, including a three-dimensional substrate on and / or in which a pyrolyzate of a phenolic resin or polymer forms an electrically conductive carbon network. Such articles may be incorporated in structured materials applications, which may include support, sorbent, and or catalyst components. Also described are methods of fabricating such articles and structured materials, and apparatus comprising same, and methods of use of such articles and structured materials and apparatus for conducting material transformation processes requiring input of heat for their performance, such as CO2 adsorption, methane pyrolysis for hydrogen and carbon production, hydrogen-assisted conversion of CO2 to hydrocarbons, including catalytic conversion of CO2 to olefins, catalytic conversion of CO2 to propane (liquefied petroleum gas), and catalytic conversion of CO2 to renewable natural gas, reverse water gas shift reaction, steam ethane cracking, propane cracking, steam methane reforming, and dry methane reforming.

The invention provides spherical porous carbon as well as a preparation method and application thereof, and relates to the technical field of porous carbon materials. The preparation method provided by the invention comprises the following steps: carrying out spray drying on a phenolic resin solution in which lithiates and borides are dissolved to obtain resin microspheres; pre-oxidizing the resin microspheres at the temperature of 150-300 DEG C to obtain a carbon sphere precursor; carbonizing the carbon sphere precursor in an inert atmosphere at the temperature of 1000-1200 DEG C to obtain carbon microspheres; performing cyclic activation and pore forming on the carbon microspheres in an active atmosphere of 800-1000 DEG C to obtain porous microspheres; and reducing the porous microspheres in a reducing atmosphere of 400-600 DEG C to obtain the spherical porous carbon. The spherical porous carbon material with developed micropores and high specific surface area can be prepared, meanwhile, the coulombic efficiency is high, the conductivity is good, the used preparation method is simple and efficient, and large-scale industrial production is facilitated.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a phenolic resin industrial wastewater treatment process which comprises the following steps: S1, pretreatment: introducing collected industrial wastewater into a grating tank, and then adding a flocculant into coagulating sedimentation equipment to promote the coagulation of suspended solids so as to form particulate matters easy to precipitate for precipitation; s2, performing multi-stage biological enhancement treatment; s3, membrane separation deep treatment; and S4, recycling and discharging. Wherein the coagulating sedimentation equipment in the step S1 comprises a flocculation basin and a sedimentation basin body, a plurality of inclined plate bodies are arranged in the sedimentation basin body, the plurality of inclined plate bodies are movably mounted in the sedimentation basin body through a swing adjusting mechanism, a pollution discharge basin is arranged at the bottom of the sedimentation basin body, an overflow weir is arranged in the sedimentation basin body, and the overflow weir is arranged in the sedimentation basin body. The overflow weir is located above the inclined plate body, a drainage groove is formed in one side of the sedimentation tank body, and the drainage groove is communicated with the overflow weir; according to the invention, the precipitation treatment effect on colloids and flocculated suspended solids in wastewater can be improved.

The invention discloses a low-carbon magnesia-carbon refractory material for clean steel smelting and a preparation method thereof, and relates to the technical field of magnesia-carbon refractory materials. The low-carbon magnesia-carbon refractory material comprises the following components: 40-50 wt% of fused magnesite with the particle size of 3-5 mm, 20-30 wt% of fused magnesite with the particle size of 1-3 mm, 10-20 wt% of fused magnesite with the particle size of less than or equal to 74 [mu] m, 8-12 wt% of silicon powder, 1-3 wt% of alumina powder and 3-5 wt% of crystalline flake graphite. 2-4 wt% of a composite additive and 4-6 wt% of phenolic resin are added; the composite additive comprises andalusite and mullite. The material has excellent mechanical properties, thermal shock resistance, oxidation resistance and erosion resistance; the preparation method has the characteristics of low cost and simple process, and the prepared low-carbon magnesia carbon refractory material has excellent oxidation resistance, thermal shock resistance and slag resistance by exerting the phase volume expansion effect and intergranular phase enhancement effect of the multiphase ceramic; the used graphite is low in content, graphite consumption and molten steel recarburization risk can be reduced, and the method is suitable for smelting clean steel.

The invention relates to the field of friction materials, and discloses a high-reliability friction material for an electromagnetic brake and a preparation method of the high-reliability friction material. Raw materials of the friction material comprise benzoxazine, phenolic resin, butyronitrile rubber powder, modified basalt fibers, PBO pulp, ceramic fibers, plant fibers, carbon fiber powder, potassium titanate lamellar crystals, barite, light calcium carbonate, friction particles, wollastonite powder, aluminum-titanium powder, feldspar powder, aluminum oxide, zircon powder, garnet powder, crystalline flake graphite, artificial graphite, flexible graphite and composite metal sulfide. And polymer lubricating material micro powder. The friction material provided by the invention is suitable for a high-temperature and high-humidity environment, the stability of the braking performance of a brake is improved, and the phenomenon that the brake slips due to attenuation of braking torque is reduced.

The invention discloses a uniform carbon-coated lithium iron phosphate positive electrode material and a preparation method thereof, and relates to the technical field of lithium iron phosphate positive electrode materials, the uniform carbon-coated lithium iron phosphate positive electrode material comprises lithium iron phosphate matrix particles, the lithium iron phosphate matrix particles are coated with a composite carbon layer, and the composite carbon layer is doped with cerium modified tantalum carbide nanocrystals; the preparation method of the cerium modified tantalum carbide nanocrystal comprises the following steps: dissolving pentaethoxy tantalum and cerous nitrate in ethylene glycol, adding urea as a precipitator, and synthesizing a Ta-Ce-O precursor through a microwave-assisted solvothermal method; the Ta-Ce-O precursor and phenolic resin are mixed and then subjected to ball milling and sintering, and the cerium modified tantalum carbide nanocrystal is obtained. By introducing a small amount of cerium modified tantalum carbide nanocrystals into the composite carbon layer for many times, uniform coating of the composite carbon layer can be realized, and the electrochemical performance of the lithium iron phosphate positive electrode material is enhanced.

The invention discloses a multilevel-structure phenolic resin material, a multilevel-structure carbon material and a preparation method, and the preparation method comprises the following steps: (1) mixing a mixture containing a surfactant, a cosurfactant, an organic solvent and water to obtain spherical emulsion droplets; and (2) adding a phenolic resin precursor and ammonia water into the spherical emulsion liquid drops, reacting, centrifuging, washing with alcohol, and drying to obtain the phenolic resin material with the multilevel structure. According to the preparation method, spherical emulsion droplets are used as soft templates, the phenolic resin material with the multilevel structure is synthesized in a one-pot liquid phase through multilevel sequential dynamic assembly on a water-oil interface, and the derivative carbon material subjected to heat treatment also maintains the original multilevel structure and morphology, is good in dispersity and has an adjustable polyhedral structure, an adjustable opening degree and an adjustable pore size.

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 special papermaking and carbon fiber composite material preparation, in particular to high-air-permeability pitch-based carbon fiber base paper and a preparation technology thereof.The preparation method comprises the following steps that 1, pitch-based carbon fibers A are cleaned with diluted hydrochloric acid; dividing and brooming aramid fibers to obtain aramid pulp B; 2, performing wet forming on the pitch-based carbon fibers and the aramid pulp to obtain carbon fiber paper; and step 3, impregnating the pitch-based carbon fiber paper with phenolic resin, drying, and finishing to obtain the pitch-based carbon fiber base paper. The invention provides a novel method for preparing the high-air-permeability carbon fiber base paper through acid cleaning of carbon fibers, fibrillation of aramid fibers, wet forming of mixed pulp, resin impregnation strengthening and hot-pressing finishing, and the method comprises the steps that aramid pulp assists in interweaving, low-concentration resin strengthening is conducted, and the high-air-permeability carbon fiber base paper is obtained; the problem that strength, flexibility, high conductivity and high air permeability are difficult to consider at the same time is solved, and the high-air-permeability carbon fiber base paper and the preparation process thereof are provided.

The invention belongs to the technical field of carbon-carbon heaters, and particularly relates to a preparation method of a carbon-carbon heater. The preparation method of the carbon-carbon heater comprises the following steps: carrying out first vacuum filtration on a dispersion liquid of short carbon fibers in a mold, adding a mixed liquid of phenolic resin and ethanol into the mold, carrying out second vacuum filtration, demolding, curing and molding, dipping an obtained carbon-carbon heater blank in asphalt or phenolic resin, and carbonizing to obtain the carbon-carbon heater. The obtained carbonized blank is subjected to graphitization treatment, vapor deposition densification and purification treatment, and the carbon-carbon heater is obtained. Through vacuum filtration forming, manual knitting errors can be avoided, the uniformity of the product is better, and the conductivity of the prepared carbon-carbon heater is good. And meanwhile, large-batch production can be realized, the productivity is higher, the labor cost is saved, and time and labor are saved. The preparation method is low in raw material consumption, low in cost and convenient to operate, and the carbon-carbon heater is good in integrity, low in impurity content and good in conductivity and mechanical property.

The invention relates to the technical field of epoxy molding compounds, in particular to a low-shrinkage and high-heat-resistance epoxy molding compound and a preparation method thereof. The low-shrinkage and high-heat-resistance epoxy molding compound is prepared from the following raw materials in parts by weight: 6 to 8 parts of epoxy resin, 3 to 7 parts of phenolic resin, 80 to 90 parts of filler, 0.6 to 1 part of modifier, 0.1 to 0.5 part of accelerant, 0.2 to 0.4 part of coupling agent, 0.3 to 0.8 part of flexibilizer, 0.2 to 0.4 part of release agent, 0.2 to 0.4 part of coloring agent and 0.3 to 0.5 part of flame retardant, the modifier is a mixture of 1-phenyl-5-mercaptotetrazole and 5-aminotetrazole according to a weight ratio of 5: (1 to 5); the prepared epoxy molding compound has the characteristics of low shrinkage and high heat resistance.

The invention relates to a sound insulation and heat insulation integrated phenolic aerogel perforated plate composite material and a preparation method thereof. The method comprises the following steps: uniformly mixing phenolic resin, a pore forming agent and a curing agent to obtain a phenolic aerogel precursor; a piece of fiber fabric is placed in the phenolic aerogel precursor to be soaked, then curing, solvent replacement and vacuum drying are conducted, and the fiber-reinforced phenolic aerogel composite material is obtained; and perforating the fiber-reinforced phenolic aerogel composite material, and then adhering another fiber fabric to the back surface of the perforated fiber-reinforced phenolic aerogel composite material to prepare the sound-insulation and heat-insulation integrated phenolic aerogel perforated plate composite material. According to the invention, the fiber-reinforced phenolic aerogel composite material is perforated and is combined with the fiber fabric, so that the composite material with excellent noise reduction performance and heat insulation performance in a full frequency band is prepared; the perforated plate and the porous material are combined, and the low-frequency noise reduction performance of the perforated plate and the high-frequency noise reduction performance of the porous material are both achieved.

The invention provides a functional graded porous carbon microsphere and a preparation method and application thereof, the preparation method comprises the following steps: S1, mixing a soft template, a phenolic compound, a cross-linking agent and a basic catalyst, and reacting to obtain a thermosetting phenolic resin microsphere; s2, carrying out pre-carbonization treatment on the thermosetting phenolic resin microspheres to obtain a carbonized material; s3, performing physical activation on the carbonized material to obtain graded porous carbon microspheres; s4, performing heat treatment on the graded porous carbon microspheres to obtain functionalized graded porous carbon microspheres; the preparation method has the characteristics of simple process, environmental protection and economical efficiency, the functionalized porous carbon microspheres prepared by the method are uniform in morphology, and the pore volume, pore diameter and pore structure of the functionalized graded porous carbon microspheres can be accurately regulated and controlled, so that the functionalized graded porous carbon microspheres meeting application requirements are obtained.

The invention belongs to the technical field of material preparation, and aims to solve the problems of interface separation and weak oxidation resistance under complex working conditions caused by insufficient interface bonding force of the existing carbon / carbon composite material. In order to achieve the purpose, the invention provides a carbon / carbon composite material and a preparation method thereof. The carbon / carbon composite material comprises the following components in percentage by mass: 40%-55% of polyacrylonitrile-based carbon fibers, 10%-25% of pitch-based carbon fibers, 8%-20% of nano silicon dioxide grafted carbon fibers, 8%-20% of biological pitch, 8%-15% of nano graphene modified phenolic resin, 3%-6% of silicon carbide whiskers, 2%-4% of zirconium boride nanoparticles, 2%-4% of graphitized carbon fibers and 1%-3% of a natural plant extract antioxidant. The carbon / carbon composite material provided by the invention can provide stable interface bonding force and remarkable oxidation resistance, so that the structural integrity and mechanical property stability of the material when bearing various complex stresses such as stretching, compression, bending, shearing and the like are guaranteed, and the application range of the material in the field of high-temperature oxidation resistance is widened.

The invention relates to the technical field of flame retardance, and discloses a flame-retardant coating and a preparation method thereof.The flame-retardant coating is obtained by adding phenolic resin, polycarbonate, phosphorus-containing modified phenolic resin, boric acid-containing benzoxazine, an organic silicon resin defoaming agent, a propylene glycol film-forming agent and water into a stirrer and stirring. The flame-retardant coating contains a large amount of anacardol, long chains in the anacardol can also be crosslinked to form a net-shaped structure, a net-shaped carbon skeleton structure is formed under high-temperature carbonization, degradation products are inhibited during combustion, and the flame-retardant coating has good fire resistance; wherein oxazolidinone generated by reaction of an epoxy group of epoxidized phenolic resin and an isocyanate group of hexamethylene diisocyanate is a heterocyclic ring with very high heat resistance and also plays a role in synergistic fire resistance; the flame-retardant coating contains a large amount of phosphorus elements, sulfur elements and nitrogen elements, has a good flame-retardant effect, and achieves a synergistic flame-retardant effect.

The invention belongs to the field of electrode paste preparation, and provides low-temperature curing silver-coated copper paste for a heterojunction solar cell and a preparation method of the low-temperature curing silver-coated copper paste. Ethyl cellulose is adopted as a matrix material, a stable matrix network is provided for slurry through good cohesiveness and dispersity of ethyl cellulose, and a network structure with a high crosslinking degree is formed by adding modified phenolic resin, organic silicon modified epoxy acrylate and other chemical modification materials into the slurry. The mechanical strength and adhesive force of the slurry are further enhanced, surface modification is carried out on inorganic filler such as silver-coated copper powder and bismuth oxide through a silane coupling agent and a titanate coupling agent, and the interface bonding force between the filler and an organic matrix is enhanced through silicon-oxygen bonds formed on the surface of the filler; by adding the carboxylated polyamide wax and the organic bentonite, the agglomeration tendency of the filler is reduced by utilizing the adsorption and electrostatic repulsion effects of the carboxylated polyamide wax and the organic bentonite on filler particles, and the obtained conductive slurry has the characteristics of excellent conductivity and low-temperature rapid curing.

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 the technical field of lithium battery negative electrode materials, and particularly discloses a resin-based self-activated porous carbon material and a preparation method and application thereof.The preparation method comprises the following steps that a diphenol monomer, a diphenol monomer containing thioether bonds, formaldehyde or polyaldehyde and a catalyst A are subjected to a condensation polymerization reaction, and phenolic resin is obtained; and carbonizing the phenolic resin to obtain the resin-based self-activated porous carbon material. The phenolic resin is synthesized by utilizing the diphenol monomer containing the thioether bond, so that a thioether alkane side chain is introduced into the phenolic resin, and in the carbonization process of the phenolic resin, because the thioether bond is extremely easy to decompose at high temperature to generate gas, a phenolic resin framework can be subjected to pore forming; the prepared resin-based self-activated porous carbon material has high specific surface area and pore volume, controllable design of the internal pore structure of the resin-based porous carbon can be realized by controlling the structure and modification proportion of the thioether alkane side chain, and ideal pore distribution is obtained.

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 discloses a porous carbon material as well as a preparation method and application thereof, and the porous carbon material is prepared by the following steps: by taking a silicon dioxide mesoporous hollow sphere as a hard template through a hard template method, carrying out condensation reaction on phenol and formaldehyde in the hollow part of the silicon dioxide mesoporous hollow sphere to form phenolic resin; and curing, carrying out carbon activation treatment and etching to obtain the spherical phenolic resin porous carbon material. The porous carbon material prepared by the preparation method disclosed by the invention has a relatively high specific surface area and a relatively uniform pore structure, and the cycle performance of a secondary battery can be improved when the porous carbon material disclosed by the invention is used for preparing a negative pole piece and assembling the negative pole piece into the secondary battery.

The invention discloses a phthalonitrile modified phenolic aerogel and a preparation method and application thereof. Linear phenolic aldehyde, 4-nitrophthalonitrile and a basic catalyst are dissolved in an organic solvent, a water bath reaction is conducted, powder is prepared, and phthalonitrile etherified phenolic resin is obtained; preparing a mixed solvent, and dissolving linear phenolic aldehyde and phthalonitrile etherified phenolic resin in the mixed solvent to obtain a mixed solution; adding a cross-linking agent into the mixed solution, carrying out sol-gel reaction to obtain wet gel, and aging, segmentally curing and drying the wet gel to obtain the phthalonitrile modified phenolic aerogel. The pyrolytic property of the phenolic aerogel is improved, the phthalonitrile modified phenolic aerogel with high carbon residue and high thermal stability is obtained under the condition of low-temperature heating, and the method is suitable for being applied to the field of thermal insulation ablation of a thermal protection system of aerospace equipment.

The invention discloses a triazine biphenyl compound, a composition, a cured product as well as a preparation method and application of the triazine biphenyl compound, the composition and the cured product. The compound is phenolic resin with a triazine biphenyl structure obtained through condensation polymerization of p-cyanobiphenol; the phenolic resin respectively reacts with an epichlorohydrin compound and an acyl chloride compound to obtain epoxy resin and active ester with a triazine biphenyl structure, and the epoxy resin and the active ester can be self-cured or cured under the action of an imidazole accelerator; in the preparation process, triazine ring (containing nitrogen) is introduced as a node, trifunctional epoxy resin with a rigid aromatic structure as an arm and an active ester curing agent (the same skeleton) are prepared into a thermosetting cross-linked network by adopting a non-polar cross-linking scheme, and a three-dimensional network intrinsic microporous structure is formed through in-situ cross-linking regulation and control of a rigid long-arm branched unit. Further, the bottlenecks of low dielectric property, high temperature resistance, flame retardance and the like are broken through, and the cured material has the characteristics of excellent flame retardance, high temperature resistance and low dielectric property.

The invention provides a high-temperature-resistant magnesia-carbon composite refractory brick and a preparation method thereof, and belongs to the technical field of magnesium oxide refractory wall bricks, the refractory brick comprises the following raw materials: double-layer modified magnesium oxide, modified crystalline flake graphite, zircon powder, modified liquid phenolic resin and a benzoxazine cross-linking agent; the double-layer modified magnesium oxide is obtained by firstly coating magnesium oxide with powder phenolic resin, aluminum oxide and zirconium oxide and then coating magnesium oxide with asphalt, micron magnesium oxide, zirconium oxide and calcium oxide; the modified crystalline flake graphite is obtained by coating crystalline flake graphite with strontium hydroxide, asphalt and boron carbide; the modified liquid phenolic resin is formed by mixing liquid phenolic resin with a silane coupling agent and a polyacrylate cross-linked polymer. Double-layer modified magnesium oxide, modified crystalline flake graphite and modified liquid phenolic resin are prepared by adopting special components and a method and are matched with zircon powder and a benzoxazine cross-linking agent for use, and a reasonable forming and sintering process is designed, so that the refractory brick has good high-temperature stability, oxidation resistance, thermal shock resistance and the like.

The invention discloses phenolic resin polymer spheres as well as a preparation method and application thereof, and belongs to the technical field of heavy metal adsorption in sewage treatment. According to the phenolic resin polymer sphere provided by the invention, the phenolic resin polymer sphere with specific morphology is obtained by improving the synthesis method of the phenolic resin polymer sphere. The adsorption site activity of the phenolic resin polymer sphere can be regulated and controlled in an illumination activation mode, the adsorption capacity and the adsorption efficiency on chromium are remarkably improved by promoting chemical adsorption, and the adsorption capacity and the adsorption efficiency are far higher than those of other chromium adsorbents reported in current literatures; the chromium adsorption capacity is far higher than that of a chromium adsorbent in light condition research. And meanwhile, chemical adsorption under illumination activation can improve the reduction capacity on hexavalent chromium and reduce the toxicity of hexavalent chromium. Moreover, the reduced trivalent chromium is directly adsorbed on the surfaces of the phenolic resin polymer spheres, so that the trivalent chromium does not need to be removed by a precipitation method, and the treatment process of the chromium-containing wastewater is saved.