1382 results about "Phenol formaldehyde resin" patented technology

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 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 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.

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 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 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.

The application relates to the technical field of packaging films, and discloses an antistatic plastic packaging film and a preparation process.The antistatic plastic packaging film comprises 100 parts by weight of polyethylene, 1-6 parts by weight of phenolic resin polyaniline antistatic agent and 0.2-0.3 parts by weight of an antioxidant.The dodecyl succinic anhydride esterified phenolic resin contains carboxyl groups, can be used as a protonic acid, is doped into polyaniline through an in-situ polymerization reaction, makes imine nitrogen atoms of the polyaniline protonate, forms a charged excited state polaron, and thus the conductivity of the polyaniline is improved, the resistance of the polyethylene is reduced, and the antistatic performance of the packaging film is improved.The dodecyl succinic anhydride esterified phenolic resin and the doped polyaniline have good compatibility with the polyethylene, have a certain reinforcing effect on the polyethylene, and make the film material have higher tensile strength and elongation at break.

The invention discloses an anti-oxidation and anti-scouring heat prevention and insulation composite material, a preparation method and application, and belongs to the technical field of high-temperature thermal protection materials. According to the method, a two-step in-situ modification method is adopted, hydrolyzed organosilane reacts with phenolic resin to prepare silicon modified phenolic resin, then the silicon modified phenolic resin is bonded with an organoboron compound to obtain boron-silicon co-modified phenolic resin, a curing agent is added, then the boron-silicon co-modified phenolic resin is injected into a fiber reinforcement mold, and a finished product is obtained through a sol-gel reaction and normal-pressure drying. According to the invention, boron and silicon elements are embedded into phenolic aldehyde molecular chains through covalent bonds to form a boron-silicon-carbon hybrid network, a nano ceramic phase and a compact glassy protective layer are generated at high temperature, and the coating has excellent anti-scouring property, thermal stability and heat insulation property. The preparation process is simple and controllable, is suitable for large-scale production, can accurately regulate and control the performance, and is suitable for thermal protection parts of supersonic aircrafts.

The invention discloses high-compaction-density modified spherical lithium iron phosphate and a preparation method and application thereof.The preparation method comprises the steps that a composite iron source precursor and modified phenolic resin are compounded to form a spherical inner core, and then the spherical inner core is coated with a lithium-phosphorus mixed layer to construct a core-shell structure; the modified spherical lithium iron phosphate with the characteristics of'spherical core-porous shell 'is prepared by introducing boron nitride nanosheets as a structure-directing agent and a doping source and combining a dynamic gradient sintering process, and the modified phenolic resin is obtained by grafting water-soluble phenolic resin and polyethylene glycol, and the solid content of the modified phenolic resin is greater than or equal to 50%. The modified lithium iron phosphate with the compaction density larger than or equal to 2.55 g / cm < 3 > and the capacity retention ratio larger than 92.0% after 1C circulation 2000 times is prepared, and the technical bottlenecks that doping is not uniform, morphology is out of control and the compaction density is low in a traditional process are solved.

The invention belongs to the technical field of porous tantalum carbide ceramic preparation, and particularly relates to a preparation method of porous tantalum carbide ceramic based on a broken framework, which comprises the following steps: S1, preparing dipping slurry; s2, a polyurethane foam template is immersed in the dipping slurry, the polyurethane foam template is fully pressed so that the holes can be filled with the slurry, and the template is repeatedly rolled through a roller till no slurry flows out of the template; s3, drying the impregnated template, performing high-temperature treatment on the dried template, and cooling to room temperature to obtain a porous tantalum carbide framework; s4, crushing the porous tantalum carbide skeleton into a crushed skeleton with the size of 0.1-5 mm; s5, preparing a phenolic resin solution, mixing the crushed framework with the phenolic resin solution, then transferring the mixture into a mold, and forming after applying a certain pressure to obtain a porous tantalum carbide green body; the crushing brackets are stacked and spliced together to form a porous structure, the pores of a finished product can be adjusted by changing the sizes of the crushing brackets, and the crushing bracket can be applied to finer pores and is extremely low in shrinkage rate.

The invention relates to the technical field of refractory materials, and provides a composite regenerated magnesia carbon brick and a preparation method thereof. The composite regenerated magnesia carbon brick is prepared from the following raw material components in parts by mass: 55 to 65 parts of waste magnesia carbon brick, 40 to 50 parts of fused magnesia, 7 to 10 parts of composite graphite, 3 to 5 parts of antioxidant and 4 to 7 parts of phenolic resin, the composite graphite is of a core-shell structure, and a core in the core-shell structure is magnesium oxide coated graphite; and the shell in the core-shell structure is 1, 3, 5-trimethoxybenzene. According to the technical scheme, the problem that the mechanical property of the composite regenerated magnesia carbon brick is poorer due to poorer wettability of phenolic resin on graphite in related technologies is solved.

The invention discloses a phenolic resin material as well as a preparation method and application thereof in 3D printing, and relates to the technical field of high polymer materials. When the phenolic resin material is prepared, hydroxylated carbon nanotubes react with isocyanate propyl triethoxy silane to prepare pre-modified carbon nanotubes, and then the pre-modified carbon nanotubes react with 2-chloroethyl triethoxy silane to prepare modified carbon nanotubes; the preparation method comprises the following steps: reacting vanillin with 5-amino-1, 2-dihydro-2-methyl-3H-1, 2, 4-triazole-3-thioketone and 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide in sequence, so as to obtain pre-modified vanillin; reacting the pre-modified vanillin with divinyl disulfide to obtain modified vanillin; the modified vanillin, phenol and formaldehyde react to prepare modified phenolic resin, and then the modified phenolic resin reacts with the modified carbon nanotubes to prepare the phenolic resin material. The phenolic resin material prepared by the invention has good flame retardance, heat resistance, aging resistance, self-repairing property and mechanical property.

The invention belongs to the technical field of rhenium alloy materials, and particularly relates to a high-strength rhenium alloy material and a preparation method thereof. The rhenium alloy material is prepared from the following raw materials in percentage by mass: 12 to 24 weight percent of molybdenum, 6 to 9 weight percent of niobium, 2 to 5 weight percent of cobalt, 1 to 3 weight percent of tungsten, 0.5 to 1.2 weight percent of modified tantalum carbide, 3 to 6 weight percent of high-entropy rare earth and the balance of rhenium and other inevitable impurities. The modified tantalum carbide is prepared by the following preparation process: adding tantalum chloride, zirconium oxychloride and phenolic resin into a mixed solution of acetylacetone and n-butyl alcohol, stirring for 1-2 hours under a heating condition, dropwise adding ammonia water, continuously stirring for 0.5-1 hour, and drying to obtain a precursor; calcining the precursor, and cooling to obtain the modified tantalum carbide. The rhenium alloy prepared through the method has high hardness, good bending strength and excellent high-temperature mechanical property.

The invention provides a refractory ceramic-based material for a smelting furnace lining and a preparation method of the refractory ceramic-based material, and belongs to the technical field of ceramic refractory materials. The material comprises coated modified fused magnesite main aggregate, ceramic sand main aggregate, surface coated magnesium oxide fine powder, gamma-phase aluminum oxide micro powder, an aluminum dihydrogen phosphate solution, alkaline silica sol, a pre-reaction spinel precursor and zirconium boride micro powder. The coated modified fused magnesite main aggregate is prepared by mixing and sintering fused magnesite, silicon carbide composite powder, chromium sesquioxide powder and phenolic resin powder. And mixing the silicon carbide powder and the magnesium oxide powder, and depositing a silicon nitride layer on the particle surface to prepare the silicon carbide composite powder. The surface-coated magnesium oxide fine powder is formed by coating the surfaces of magnesium oxide fine powder particles with aluminum oxide. The pre-reaction spinel precursor is prepared by the following steps: preparing a mixed salt solution from magnesium nitrate hexahydrate and aluminum nitrate nonahydrate by using deionized water, reacting, aging and carrying out heat treatment. And the ceramic sand main aggregate is made of zirconium oxide. And all the layers are matched for use to realize balanced improvement of performance.

The invention belongs to the technical field of sodium ion batteries, and particularly relates to a phenolic resin-based hard carbon material as well as a preparation method and application thereof. Compared with the prior art, the method provided by the invention has the characteristic of simple and convenient process, the structural design is directly carried out based on the hard carbon material body, and a complicated coating or deposition process is not needed; the closed pore volume of hard carbon and the interlayer spacing and thickness of carbon layers can be accurately regulated and controlled by changing the addition amount of phosphoric acid and the temperature and time of high-temperature heat treatment; besides, the obtained hard carbon material has a rich closed-pore structure, can be used as a sodium-ion battery negative electrode material, and shows excellent first coulombic efficiency, high platform capacity and high reversible specific capacity, so that the electrochemical performance of a sodium-ion battery is remarkably improved.

The invention relates to the technical field of advanced petrochemical and chemical new materials, in particular to a fireproof flame-retardant glass fiber reinforced plastic pipeline material and a preparation method thereof.The fireproof flame-retardant glass fiber reinforced plastic pipeline material is prepared from phenolic resin, alpha-olefin ethylene copolymer, modified nano aluminum hydroxide, glass fiber, a phosphorus-nitrogen flame-retardant synergist, a silane coupling agent, a curing agent and an antioxidant; according to the invention, the formula of the fireproof flame-retardant glass fiber reinforced plastic pipeline material is designed, various fillers are subjected to multi-step modification treatment, and preparation process parameters are optimized, so that the synergistic effect of various components and various process steps is realized, and the material performance is greatly improved from microscopic interface bonding to macroscopic material performance; the technical problems that in the prior art, flame retardance and mechanical performance are difficult to consider, aging resistance is poor, and a formed structure has defects are effectively solved.

The invention relates to the technical field of preparation and application of porous carbon materials, and discloses a preparation method, equipment and application of a phenolic resin-based carbonaceous porous material with a walnut shell structure and rich in micropores, and the method comprises the following steps: emulsifying and polymerizing a phenol source, an aldehyde source, a fused salt system containing ZnCl2 and a catalyst in a water phase to prepare resin microspheres internally wrapped with fused salt; after solidification and oxidation treatment, in-situ activation is carried out under the action of a liquid phase template of a molten salt phase in a medium-temperature inert atmosphere; and after washing and desalting, carrying out high-temperature secondary etching pore-forming through alkali, water vapor or carbon dioxide. According to the method, the in-situ fused salt doping and graded etching synergistic strategy is utilized, carbon skeleton shrinkage is effectively inhibited, and the microporosity is greatly improved. The surface of the obtained material presents walnut shell-shaped textures, the specific surface area is 1800-2600m / g, the micropore volume fraction is greater than 90%, and the material has excellent electrochemical performance as a lithium ion battery silicon-carbon negative electrode matrix.

The embodiment of the invention provides a friction material composition, a brake lining, a preparation method of the brake lining, a brake and a vehicle. The friction material composition comprises the following raw materials in parts by weight: 2-10 parts of a fluoride mixture, 8-15 parts of graphite, 8-12 parts of phenolic resin, 4-12 parts of a metal oxide, 15-40 parts of a fiber material and 20-40 parts of other fillers, wherein the fluoride mixture comprises at least two of calcium fluoride, barium fluoride, cerium fluoride, aluminum fluoride, magnesium fluoride, potassium fluoride, sodium fluoride, beryllium fluoride and manganese fluoride. The brake lining prepared from the friction material composition can solve the problems of high wear rate and heat fading at the same time, the service life of the brake lining is prolonged, and the braking effect is improved.

The invention relates to the technical field of sodium ion battery negative electrode materials, in particular to a phenolic resin-based hard carbon sodium ion battery negative electrode material, a negative electrode and a preparation method and application thereof. The crosslinking degree and the main chain rigidity of the phenolic resin are regulated and controlled by regulating the number of benzene rings in side chains of aldehyde molecules, so that the internal space (free volume) of the phenolic resin is influenced, and a rich closed-pore structure is finally formed; then waste gas generated by pyrolysis of phenolic resin is used as a carbon source for chemical vapor deposition, and resin carbon is used as a substrate, so that the pore surface of hard carbon can be effectively sealed, electrolyte permeation is prevented, and open pores in the hard carbon material are converted into closed pore structures to be used as efficient sodium storage sites. Meanwhile, the method also has green sustainability and cycle economy, volatile waste gas generated by pyrolysis is reutilized as a carbon source to be deposited on the surface of resin carbon, the carbon yield is improved, the dynamic performance of the hard carbon material is also improved, and emission of the volatile waste gas is reduced.

The invention discloses a method for preparing a C / C-SiC composite material through multi-stage recovery of carbon / carbon composite material processing waste, and belongs to the technical field of C / C composite material preparation. The method comprises the following steps: carrying out multi-stage screening treatment on the carbon / carbon composite material processing waste, and screening and separating short carbon fibers and pyrolytic carbon powder; mixing the screened short carbon fibers and pyrolytic carbon powder with phenolic resin, industrial silicon powder and SiC powder, and preparing a fiber reinforced resin block in a mold pressing manner; and carrying out one-step continuous carbonization and ceramic heat treatment on the fiber reinforced resin block to finally obtain the C / C-SiC composite material. According to the method, high-added-value recycling of the C / C processing waste is achieved, the process is simple, the cost is low, operation is convenient and fast, the problems of resource waste and environmental pollution caused by existing waste treatment are solved, and the prepared C / C-SiC composite material is excellent in performance and can be widely applied to the fields of aerospace, high-end manufacturing and the like.

The invention belongs to the field of drafting rubber rings for spinning, and particularly provides a rubber ring and a preparation method thereof.The rubber ring is characterized by comprising an inner rubber layer, a reinforcing layer and an outer rubber layer which are sequentially compounded from inside to outside; the outer rubber layer is prepared by mixing the following raw materials in parts by weight: 90-100 parts of rubber, 10-20 parts of phenolic resin, 2-3 parts of an anti-aging agent, 2-3 parts of an accelerant, 5-8 parts of sulfur, 2-3 parts of zinc oxide, 0.5-2 parts of stearic acid, 3-5 parts of talcum powder, 2-5 parts of a modified copolymer and 3-5 parts of lignosulfonate; the modified copolymer is a copolymer of sulphobetaine methacrylate and glycidyl methacrylate; the prepared upper rubber ring outer rubber layer is good in drafting spinning stability, and the problem of sticky spots can be solved.

The invention relates to the technical field of high polymer materials, in particular to a method for improving the heat resistance of melamine phenolic resin by using phthalonitrile, which comprises the following steps: uniformly mixing phthalonitrile resin powder and melamine phenolic resin powder at room temperature, and then curing and molding the uniformly mixed powder at 200-280 DEG C to obtain the heat-resistant melamine phenolic resin. The melamine phenolic aldehyde-nitrile group copolymer resin is obtained. According to the method for obtaining the melamine phenolic-nitrile resin with high thermal stability, high wear resistance and high mechanical property through copolymerization, not only can the thermal stability of the resin be greatly improved, but also the mechanical property can be enhanced, and the processing window of the melamine phenolic resin can be widened.

The invention relates to the technical field of lithium battery negative electrode materials, in particular to a preparation method and application of a phenolic resin-based spherical porous carbon negative electrode material. The preparation method comprises the following steps: adding phenol, at least one natural polyphenol compound, formaldehyde, at least one biomass-based aromatic aldehyde compound, ammonia water and deionized water into a reaction container, keeping stirring, raising the temperature, adding a dispersing agent, continuously raising the temperature after a constant-temperature reaction, and carrying out a constant-temperature reaction to obtain the phenolic resin. Then adding a curing agent, raising the temperature, adjusting the pH value, and carrying out a constant-temperature curing reaction to obtain a phenolic resin-based precursor; and finally, carrying out high-temperature carbonization to obtain the phenolic resin-based spherical porous carbon negative electrode material for the lithium battery, which has high specific capacity and low expansion rate.

The invention relates to the technical field of preparation of new materials and composite materials, and discloses a ceramifiable aramid nanofiber reinforced phenolic aerogel composite material and a preparation method thereof, the composite material is prepared from a hybrid aramid nanofiber preform and a matrix phenolic resin; wherein the preform is prepared by mixing aramid nano-fiber slurry, a silane coupling agent, a transition metal precursor and water-soluble phenolic resin and freeze-drying the mixture. The preparation method comprises the following steps: dipping a preform into a matrix phenolic resin solution, carrying out sol-gel reaction and drying to obtain the composite material, and further carrying out high-temperature carbonization treatment. Through a multi-scale synergistic enhancement strategy, the silane coupling agent is utilized to reinforce interface bonding, and the transition metal precursor is utilized to realize high-temperature in-situ ceramization, so that the mechanical strength, the structural integrity and the ablation-resistant thermal protection performance of the composite material are improved, and the problems of high brittleness and easy pulverization of the traditional phenolic aerogel are solved.

The invention provides metal-hydrogen modified porous carbon and a preparation method thereof, a silicon-carbon composite material and a preparation method thereof, and a battery, and the preparation method of the metal-hydrogen modified porous carbon comprises the following steps: mixing an aldehyde compound, a phenolic compound, a metal source and a catalyst, and carrying out heating treatment to prepare modified phenolic resin; carrying out carbonization treatment on the modified phenolic resin to prepare metal-doped porous carbon; mixing the metal-doped porous carbon with a metal hydride reducing agent, and performing reduction treatment to prepare metal-hydrogen modified porous carbon; wherein the mass ratio of metal elements to phenolic compounds in the metal source is (2-5): 100. A proper amount of metal-hydrogen bonds are introduced into the inner surface of a porous carbon pore structure; when the porous carbon is subsequently subjected to silicon deposition, low-temperature, uniform and confined deposition of nano silicon in a porous carbon matrix is facilitated, and the silicon-carbon composite material with low expansion rate and excellent electrochemical performance is prepared.

The invention belongs to the technical field of adhesives, and relates to an epoxy resin composition, an epoxy resin adhesive film and application thereof. The epoxy resin composition comprises epoxy resin, a curing agent, a flexibilizer, a filler and rosin modified phenolic resin, the curing agent at least comprises a latent curing agent, the flexibilizer at least comprises acrylate rubber, the softening point of the rosin modified phenolic resin is 120-180 DEG C, the acid value is 40-100 mgKOH / g, and the filler is a filler. The rosin modified phenolic resin with the specific softening point and acid value is introduced, and the types of the curing agent and the flexibilizer are limited, so that the damping loss factor of an epoxy resin adhesive film prepared from the epoxy resin composition is relatively low in the range of 0-100 DEG C, and the stability of the damping loss factor is relatively high; meanwhile, the adhesive also has the characteristics of high elastic modulus, high toughness, high peel strength, good normal-temperature storage stability and good high-temperature rapid reactivity.