1086 results about "Polycondensation reaction" patented technology

The invention belongs to the technical field of flame-retardant macromolecules, and particularly relates to intrinsic heat-conducting flame-retardant recycled epoxy resin and a preparation method thereof. The preparation method comprises the following steps: (1) carrying out a reaction on diethanol amine and 9, 10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide (DOPO) to obtain an intermediate A; and (2) carrying out condensation polymerization on the intermediate A and phenylphosphonic acid to prepare the phosphate-terminated polyester flame retardant (PEF). And (3) carrying out epoxidation on 4, 4 '-biphenol to prepare the liquid crystal epoxy precursor LEP. And (4) mixing PEF, LEP and 3, 3 '-dithiodipropionic acid, and heating and curing to prepare the epoxy resin. The prepared epoxy resin has intrinsic heat conduction, flame retardance and efficient recoverability, and is a high polymer material with great potential.

The invention relates to the technical field of marine antifouling materials, in particular to a modified polyurethane marine antifouling coating based on a metal pyridine structure and a preparation method. According to the modified polyurethane marine antifouling paint based on the metal pyridine structure, polyhydric alcohols and diisocyanate monomers with different molecular weights are subjected to condensation polymerization to obtain a polyurethane prepolymer; then reacting a diaminopyridine monomer or a dihydroxypyridine monomer with a metal ion compound to obtain a chain extender with a metal pyridine structure; finally, the marine antifouling paint is prepared through the reaction between the terminal amino or hydroxyl of the metal pyridine structure chain extender and the terminal isocyanate group of the polyurethane prepolymer, the metal pyridine structure is introduced into polyurethane, the mechanical performance of the marine antifouling paint is enhanced, the marine antifouling paint is endowed with the antibacterial effect through metal ion release, and the service life of the marine antifouling paint is prolonged. Adhesion and growth of marine fouling organisms can be effectively inhibited, and an efficient and durable solution is provided for development of a polyurethane marine antifouling coating.

The invention discloses a superconducting carbon black co-production method based on directional refining of catalytic slurry oil and a product thereof, and belongs to the technical field of carbon black preparation, and the method comprises the following steps: mixing the catalytic slurry oil and catalytic circulating oil to obtain mixed slurry oil, and adding a deliming agent for settling separation to obtain purified slurry oil; carrying out continuous solvent extraction on the obtained purified oil slurry to respectively obtain an aromatic component and a heavy component; carrying out thermal polycondensation reaction on the obtained aromatic component in a magnetic field environment in the presence of a catalyst and a cross-linking agent, and then carrying out supercritical fluid extraction to obtain spinnable mesophase pitch; carrying out slurry reactor hydrogenation deconstruction on the obtained heavy component to obtain stable micromolecular carbon black raw oil, mixing the carbon black raw oil with a nitrogen source and a template precursor, carbonizing, and carrying out acid pickling to obtain the superconducting carbon black; through a heavy oil slurry reactor hydrogenation deconstruction'doping-template 'synergistic carbonization strategy, the superconductive carbon black with nitrogen / phosphorus co-doped and developed hierarchical porous structure is constructed in situ by a one-step method.

The invention discloses a bending-resistant and low-dielectric transparent polyimide film for a flexible electronic device as well as a preparation method and application of the bending-resistant and low-dielectric transparent polyimide film. The surfaces of glass beads are subjected to grafting modification treatment by adopting alkali liquor and a coupling agent; performing ultrasonic dispersion to uniformly disperse the grafted and modified glass beads in a solvent; the preparation method comprises the following steps: dissolving a fluorine-containing diamine monomer in a solvent containing graft modified glass beads under a nitrogen protection atmosphere, after the fluorine-containing diamine monomer is completely dissolved, slowly adding a fluorine-containing dianhydride monomer in batches under a continuous stirring condition, and preparing a transparent polyamide acid solution containing glass beads through a condensation polymerization reaction; and uniformly coating the polyamide acid solution containing the glass beads on a glass substrate through a blade coating machine, and then carrying out gradient heating to obtain the glass bead compounded transparent polyimide film. Fluorine atoms are introduced into molecular structures of dianhydride and diamine, and grafting modified glass beads are doped to serve as filler, so that the transparent polyimide film with bending resistance and low dielectric constant characteristics is successfully prepared.

The invention relates to the technical field of multi-layer copolyester films, and discloses a high-temperature-resistant antistatic multi-layer copolyester film and a preparation method and application thereof, and the multi-layer copolyester film comprises an ABA three-layer structure obtained through melt co-extrusion; the layer A is prepared from the following raw materials in percentage by mass: 5 to 30 percent of anti-blocking agent master batch and the balance of modified copolyester; the raw material of the layer B is modified copolyester; the modified copolyester is prepared from a binary acid mixture, a dihydric alcohol mixture and a catalyst through an esterification reaction and a condensation polymerization reaction; the binary acid mixture comprises furandicarboxylic acid and 2, 2 '-bifuran-5, 5'-dicarboxylic acid, and the dihydric alcohol mixture comprises ethylene glycol, 2, 2, 4, 4-tetramethyl-1, 3-cyclobutanediol and 1, 4-cyclohexanedimethanol. According to the invention, the modified copolyester is used as a main raw material, and the film is endowed with good temperature resistance in a copolymerization modification manner, and has stable and lasting antistatic performance.

The invention relates to a preparation method and system of high-molecular-weight polyethylene glycol oxalate, and the preparation method comprises the following steps: adding oxalic acid diester, ethylene glycol and a first catalyst, and carrying out transesterification to obtain an ester; adding a second catalyst, and carrying out a pre-polycondensation reaction on the esterified product to obtain a glycol oxalate oligomer; polymerizing the ethylene glycol oxalate oligomer, and carrying out final polymerization reaction to obtain polyethylene glycol oxalate; the molar ratio of the oxalic acid diester to the ethylene glycol is (1.05-1.3): 1. Compared with the prior art, by controlling excessive oxalic acid diester in the raw material ratio, namely controlling the molar ratio of oxalic acid diester to ethylene glycol to be greater than 1, the reaction rate of ethylene glycol is improved, self-polycondensation of ethylene glycol is prevented, further increase of molecular weight is facilitated, and meanwhile, the thermal performance of the product is improved.

The invention provides a semi-crystalline transparent multicomponent copolyester and a preparation method thereof, and relates to the technical field of polyester synthesis. The preparation method of the semi-crystalline high-transparency multicomponent copolyester comprises the following steps: esterification reaction: mixing terephthalic acid, ethylene glycol, a branching agent, a modified monomer and a main catalyst, and carrying out esterification reaction to obtain an esterification product; and condensation polymerization: mixing the esterification product with a main catalyst, and carrying out condensation polymerization to obtain the semi-crystalline high-transparency multi-component copolyester, the mixture of the esterification reaction and / or the condensation polymerization reaction comprises a cocatalyst. According to the preparation method disclosed by the invention, polyester is subjected to copolymerization modification with relatively low content of alcohol and / or acid modified monomers to obtain the semi-crystalline multicomponent copolyester, and the semi-crystalline multicomponent copolyester is endowed with the advantages of high transparency, high hue, low cost, easiness in processing and the like.

The application relates to the technical field of solid-state batteries, in particular to a modified polyethylene oxide and a preparation method thereof, which comprises the following steps: mixing polyethylene oxide and E12 epoxy resin, and then carrying out temperature reciprocating pulse heating to control the degree of polycondensation reaction of the polyethylene oxide and the E12 epoxy resin, so as to obtain a modified polyethylene oxide solution; and evaporating and rinsing the polyethylene oxide solution to obtain the modified polyethylene oxide. According to the technical scheme, the possibility of chain degradation caused by the interfacial gap is avoided as much as possible, the ion transmission and the stability of the mechanical structure are improved, and the solid-solid interface adhesion degree is enhanced.

The invention belongs to the field of polymeric high-molecular polymer production equipment, and relates to a final polycondensation reactor for preparing a high-quality and high-viscosity PA66 polymer, the final polycondensation reactor comprises a shell and a stirring device located in the shell, and the shell is provided with a feed port, a discharge port and a gas phase port; the shell comprises an inner layer and an outer layer, and an area between the inner layer and the outer layer forms a jacket layer; the inner layer of the shell is composed of a cylinder I and a cylinder II, and the diameter of the cylinder I is larger than that of the cylinder II. One bottom surface of the cylinder I and one bottom surface of the cylinder II are intersected and overlapped areas are communicated with each other; the position of the feed port is higher than that of the discharge port; the stirring device consists of a transmission shaft and a stirrer; the first stirrer consists of a disc and a spiral belt fixed on the disc; the second stirrer comprises a spiral structural member; and the third stirrer comprises a spiral propeller. According to the invention, the continuous propulsion of the polymer melt in the final polycondensation process is realized, the backmixing of the high-viscosity polymer melt is prevented, and the retention time consistency of the polymer melt is improved.

The present application relates to the technical field of current collectors, and specifically relates to a multilayer composite film and a current collector prepared from same. The present application provides a preparation method for the multilayer composite film. The multilayer composite film comprises a layer X, a layer Y and a layer Z from top to bottom; the layer X and the layer Z are made of polyimide, and the polyimide is a polycondensation reactant of carboxylic acid anhydride and diamine; and the material of the layer Y is any one or more of polypropylene, polyethylene, polyethylene terephthalate, polybutylene terephthalate, polyvinylidene fluoride, polytetrafluoroethylene, polyphenylene sulfide, polyphenyl ether, polyester, polystyrene and derivatives thereof. The polyimide prepared in the present application solves the problems of low solubility and poor processability of conventional fully aromatic polyimides, and a composite current collector is prepared by using heat resistance and improved surface polarity of polyimides, thereby improving the bonding force between a composite current collector film and a metal layer, and improving the tensile strength of a finished product.

The invention relates to the technical field of oil and gas field exploitation, and discloses a pressure-resistant quartz sand proppant and a preparation process and application thereof, and the proppant is composed of a quartz sand base material and a multi-layer composite coating coated on the quartz sand base material. The interface grafting layer is chemically bonded with the surface of quartz sand through a silane coupling agent; a latent acid source is utilized to slowly release acid under a heating condition, the sodium silicate in-situ hydrolysis condensation polymerization rate is accurately regulated and controlled, and nano silicon dioxide is used as a nucleation point to construct a compact inorganic nano composite inner shell; the outermost layer is coated with the organic toughening shell. According to the preparation method, the reaction process of the inorganic inner shell is accurately regulated and controlled, and the interface grafting and outer layer toughening technology is combined, so that a synergistically enhanced composite structure among the coatings is formed. According to the structure, the quartz sand propping agent is endowed with extremely low compaction breakage rate and excellent long-term flow conductivity, and the fracturing operation requirements under high-temperature and high-pressure harsh conditions of deep wells, ultra-deep wells and the like can be met.

The invention discloses an isosorbide-based heat-resistant yellowing-resistant biodegradable polyester and a preparation method thereof.The preparation method comprises the following steps that under the condition of an esterification catalyst, dibasic acid and dihydric alcohol are subjected to an esterification reaction, the dibasic acid is composed of terephthalic acid and 1, 1-cyclohexanedicarboxylic acid, and the dihydric alcohol is composed of 1, 1-cyclohexanedicarboxylic acid; the dihydric alcohol is composed of isosorbide and aliphatic dihydric alcohol; after the esterification reaction is finished, adding a polycondensation catalyst, a stabilizer and a toner into an esterification reaction product to carry out polycondensation reaction; after the polycondensation reaction is finished, the polycondensation product is subjected to bracing and grain-sized dicing, and the isosorbide-based heat-resistant and yellowing-resistant biodegradable polyester is obtained. 1, 1-cyclohexanedicarboxylic acid is introduced to replace part of terephthalic acid, aromatic ring structures on polyester chains are reduced, the yellowing resistance of polyester is improved, meanwhile, biomass-sourced isosorbide is added as a heat-resistant modified component, and the isosorbide-based heat-resistant and yellowing-resistant biodegradable polyester is obtained through a direct esterification method.

The invention discloses a self-repairing polyurethane-boron nitride composite heat conduction material and a preparation method thereof, an electronic device heat dissipation material and a flexible sensor, and relates to the technical field of polymer composite materials. The preparation method of the self-repairing polyurethane-boron nitride composite heat conduction material comprises the following steps: carrying out a first polycondensation reaction on polydihydric alcohol and a diisocyanate monomer to obtain an intermediate, and carrying out a second polycondensation reaction on the intermediate and an aromatic amino compound containing disulfide bonds to obtain a polyurethane matrix; and mixing the polyurethane matrix and the zinc ion-tannic acid co-modified boron nitride to obtain a mixture, casting the mixture into a mold, and curing to obtain the self-repairing polyurethane-boron nitride composite heat-conducting material. The heat conductivity coefficient of the self-repairing polyurethane-boron nitride composite heat conduction material reaches 4.8 W.m <-1 >. K <-1 >, the material can be self-repaired at normal temperature after being broken, the repairing efficiency reaches up to 96%, and the problem that self-healing performance and heat conductivity of an existing polyurethane material are difficult to consider at the same time can be effectively solved.

The invention relates to a method for preparing high-molecular-weight polyethylene furandicarboxylate by a one-step method, and belongs to the technical field of bio-based polyester materials. The method comprises the following steps: weighing raw materials including 2, 5-furandicarboxylic acid, ethylene glycol, an end group regulator, a protective agent, a decarboxylation inhibitor and a catalyst, mixing and adding into a reaction container, introducing nitrogen, maintaining the pressure of the nitrogen in the reaction container to be 50-150 kPa, carrying out esterification reaction, heating and vacuumizing until the pressure is less than or equal to 50 Pa after the esterification reaction is completed, and carrying out polycondensation reaction to obtain the 2, 5-furandicarboxylic acid. And carrying out extrusion and drying so as to obtain the high-molecular-weight polyethylene furandicarboxylate, wherein the high-molecular-weight polyethylene furandicarboxylate is obtained. According to the method, the FDCA conversion rate is larger than or equal to 98%, the number-average molecular weight of the obtained product is larger than or equal to 32 kg / mol, no heavy metal residues exist, and the method is suitable for large-scale production of high-end bio-based packaging materials.

The invention provides a polyamide elastomer and a preparation method thereof. The method comprises the following steps: (1) under the action of a first catalyst, carrying out condensation polymerization on a poly-diol compound and a binary acid monomer in a solvent to obtain an end-capping reagent; (2) under the action of a second catalyst, an end-capping reagent and a comonomer are subjected to a contact reaction, and a polyamide block is obtained; and (3) in the presence of a stabilizer and under the action of a third catalyst, carrying out contact reaction on the soft segment and the polyamide block to obtain the polyamide elastomer, wherein the polydihydric alcohol compound is polyalkylene ether glycol with the number-average molecular weight of 150-2000, and the stoichiometric ratio of the polydihydric alcohol compound to the binary acid monomer is 1: (2.0-2.4); the comonomer is C4-C12 lactam and / or C4-C12 amino carboxylic acid; and the soft segment is a hydroxyl-terminated diol polymer. According to the invention, the performance loss of the hard-segment-dominated material is not caused on the basis of improving the soft-segment-dominated material mechanical property of the product, and the polyamide elastomer product with excellent comprehensive performance is obtained.

The invention discloses a method for preparing poly (butylene adipate-co-terephthalate) by a one-step method. The method comprises the steps of terephthalic acid esterification, adipic acid esterification, secondary esterification of terephthalic acid esterification liquid and adipic acid esterification liquid, and condensation polymerization, wherein terephthalic acid esterification and adipic acid esterification are synchronously carried out; in the terephthalic acid esterification process, a catalyst and a heat stabilizer are mixed and heated to obtain a mixed catalyst, and after terephthalic acid esterification reaction generates water, the mixed catalyst is added into a reaction system in a manner of feeding under the liquid level, so that on one hand, hydrolysis of the catalyst is reduced, and the catalytic efficiency of the catalyst is improved; on the other hand, the heat exchange efficiency is reduced and the energy consumption is increased due to the fact that a catalyst hydrolysis product covers a heat exchange pipeline; under the condition of not supplementing a catalyst, the synthesized product with qualified indexes such as PBAT melt index, color value, terminal carboxyl group and the like can be realized through subsequent secondary esterification and polycondensation.

The invention discloses a graded porous mordenite catalyst as well as a preparation method and application thereof, and belongs to the technical field of heterogeneous catalysis and chemistry and chemical engineering. The preparation method comprises the following steps: carrying out hydrolysis-polycondensation reaction on a silicon source, an aluminum source, an alkali source and water, after the reaction is completed, adding an alpha, omega-biquaternary ammonium salt surfactant as a template agent, and carrying out template-oriented self-assembly reaction to obtain gel; carrying out hydrothermal crystallization treatment on the gel to obtain zeolite raw powder; roasting the zeolite raw powder for the first time to remove the template agent so as to obtain roasted zeolite; and carrying out ion exchange treatment on the roasted zeolite, and roasting again to obtain the graded porous mordenite catalyst. According to the invention, the alpha, omega-biquaternary ammonium salt surfactant is used as the template agent to prepare the hierarchical porous structure catalyst with both inherent micropores and uniform mesopores, so that mass transfer can be improved and acidic sites can be optimized.

The invention belongs to the technical field of polyester aerogel fibers, and discloses a skin-core type polyester aerogel fiber and a preparation method thereof.The monofilament of the skin-core type polyester aerogel fiber is of a skin-core structure, base materials of a skin layer and a core layer are polyester, silicon-containing polyester aerogel particles of a core-shell structure are dispersed in the core layer, and the silicon-containing polyester aerogel particles of a core-shell structure are dispersed in the core layer. The mass of the silicon-containing polyester aerogel particles with the core-shell structure in the core layer is 25-45% of the mass of polyester, and the preparation process of the silicon-containing polyester aerogel particles with the core-shell structure comprises the following steps: soaking hydrophilic silicon dioxide aerogel in an ethanol solution, mixing the modified hydrophilic silicon dioxide aerogel, a silane coupling agent, PTA, ethylene glycol, water and other substances, heating, and carrying out ultrasonic dispersion to obtain the silicon-containing polyester aerogel particles with the core-shell structure. Carrying out esterification reaction and condensation polymerization reaction; the preparation method comprises the following steps: respectively preparing a core layer raw material and a skin layer raw material, and performing skin-core composite spinning to obtain the skin-core type polyester aerogel fiber. The heat-insulating material has good heat-insulating property and mechanical property at the same time.

The present invention relates to a dental diaphragm copolyester and a preparation method thereof, the preparation method comprises the following steps: 2, 5-furandicarboxylic acid or an ester thereof, aliphatic or alicyclic diol and (2-hydroxy-5-formyl phenyl) diphenylborane are subjected to a reaction to obtain an esterification or ester exchange product; and carrying out condensation polymerization on the esterification or ester exchange product and the stabilizer to prepare the copolyester for the dental diaphragm. 2, 5-furandicarboxylic acid is derived from a renewable biomass resource and meets the requirements of green and sustainable development; compared with terephthalic acid and furan ring structures, the film has higher rigidity and polarity, the yield of hot press molding is improved, the same correction force can be met by a thinner film, the wearing comfort of a patient is improved, and meanwhile stress relaxation is improved; the catalyst perfectly combines strong Lewis acidity, intramolecular stabilization and potential bifunctional activation through structural design, provides possibility for efficient and green synthesis of polyester, avoids use of heavy metal, and is higher in biological safety.

The invention discloses a light-emitting diode packaging material and a preparation method thereof, and relates to the technical field of light-emitting diodes. The method comprises the following steps: adding 4, 4 '-diaminodiphenyl ether into pyromellitic dianhydride for condensation polymerization to obtain a polyamic acid solution, and adding zinc borate nanowires and aluminum nitride powder to prepare an inorganic skeleton enhanced polyamic acid suspension; the preparation method comprises the following steps: reacting zirconium hydroxide sol with an aluminum sec-butoxide solution, and carrying out hydrothermal reaction and high-temperature calcination to obtain ZrO2at-alpha-Al2O3 core-shell particles; the preparation method comprises the following steps: pre-polymerizing 4, 4 '-diphenylmethane bismaleimide and bisphenol A cyanate ester to obtain a prepolymer; the preparation method comprises the following steps: mixing bisphenol A type epoxy resin, inorganic skeleton reinforced polyamide acid suspension, ZrO2at-alpha-Al2O3 core-shell particles and a prepolymer under vacuum, defoaming, injecting into a mold, heating, curing, cooling and demolding to obtain the product. Through the synergistic effect of triple modification, the high temperature resistance and lasting thermal stability of the packaging material are improved, and the packaging material is suitable for the field of light emitting diode packaging with high temperature resistance requirements.

The invention belongs to a preparation method of furan resin, and provides formaldehyde-free plant polyphenol modified furan resin and a preparation method thereof in order to solve the technical problems of formaldehyde harm, non-renewable raw material phenol source and poor environmental protection property in the existing furan resin preparation process. The plant polyphenol modified furan resin is prepared by carrying out condensation polymerization on a phenolic mixture and bio-based aldehydes, and the phenolic mixture comprises plant polyphenol and another phenolic compound. The crosslinking density and the mechanical property of the resin are obviously improved. Meanwhile, a three-dimensional cross-linked network is constructed by replacing formaldehyde with a bio-based aldehyde compound to serve as a cross-linking agent, and mild and controllable reaction conditions are realized by combining a weakly acidic environment-friendly catalyst system. The problem of formaldehyde release in the resin synthesis and curing process is effectively solved, the obtained resin is high in bio-based content, has the rapid curing characteristic and excellent mechanical strength, the wastewater treatment difficulty is remarkably reduced, and the remarkable environment-friendly advantage is achieved.

The invention relates to the field of pipes, and discloses a high-flame-retardance MPP cable protection pipe and a preparation method thereof.The cable protection pipe comprises polypropylene resin, modified graphene oxide, modified maleic anhydride grafted polypropylene and auxiliaries; the modified graphene oxide is prepared by grafting a modified benzotriazole intermediate and a double-bond DOPO derivative substituted cyclotriphosphazene derivative into graphene oxide; the modified benzotriazole intermediate is prepared by grafting 2-(2, 4-dihydroxyphenyl)-2H-benzotriazole and ethyl bromoacetate, and then reacting with 2, 2, 6, 6-tetramethyl-4-piperidinol; the double-bond DOPO derivative is prepared through the reaction of DOPO-HQ and 4-vinyl benzyl chloride; the modified maleic anhydride grafted polypropylene is prepared by grafting octa-aminopropyl polyhedral oligomeric silsesquioxane prepared by a polycondensation reaction of 3-aminopropyltriethoxysilane and maleic anhydride grafted polypropylene. The pipe prepared by the invention has good mechanical properties, ultraviolet aging resistance, low-temperature toughness, heat resistance, flame retardance and wear resistance.

The invention discloses a puncture-resistant packaging film and a preparation method thereof. The packaging film comprises a polyamide layer; the polyamide layer is prepared from the following raw materials in parts by mass: 70 to 90 parts of polyamide, 20 to 30 parts of modified polyamide and 5 to 10 parts of modified filler; the modified polyamide is prepared by the method comprising the following steps: carrying out condensation polymerization on a mixed monomer containing diamine, dibasic acid and polybasic acid to obtain a polyamide prepolymer; wherein the molar weight of the polybasic acid accounts for 5-10% of the total mole number of the dibasic acid and the polybasic acid; the preparation method comprises the following steps: carrying out melt esterification reaction on a polyamide prepolymer and polyester diol in a mass ratio of (10-25): (75-90) in the presence of a catalyst, and reacting a terminal hydroxyl group of the polyester diol with a carboxyl group of the polyamide prepolymer to obtain the modified polyamide. The problems that the polyamide material is high in rigidity and poor in puncture resistance can be effectively solved.

The invention relates to the technical field of coatings, in particular to a high-efficiency photocuring monomer based on bio-based star-shaped polyester polyol and a preparation method of the high-efficiency photocuring monomer based on bio-based star-shaped polyester polyol. Castor oil derived trimethylolpropane is used as a core, adipic acid and epoxidized soybean oleic acid are introduced through a condensation polymerization reaction to form star-shaped structure polyol; an acrylate group is introduced into a polyol molecule through a glycidyl methacrylate ring-opening reaction, and an epoxy group in the epoxidized soybean oleic acid is retained; through unique molecular structure design, reasonable component selection and innovative process optimization, multiple technical breakthroughs are realized. The bio-based branching design has remarkable effects in the aspects of cost reduction and environmental protection; the reaction activity and the curing performance of the material are greatly improved through the synergistic effect of bifunctional groups; and the problem of environmental pollution in the traditional process is solved by green process integration. The invention provides a high-performance and environment-friendly novel photocuring monomer for the field of photocuring materials.

The invention discloses a polyurea composite coating based on MXene at carbon dots. The composite coating is prepared by heating and curing a polyurea composite elastomer based on MXene at carbon dots and an organic solvent, the polyurea composite elastomer based on the MXene (at) carbon dots is prepared by mixing a polyurea elastomer and MXene (at) carbon dot powder; the polyurea elastomer is prepared from the following raw materials: isophorone diisocyanate, poly (propylene glycol) bis (2-aminopropyl ether), isophthaloyl hydrazine and 4, 4 '-diaminodiphenyl disulfide through a two-step condensation polymerization reaction. Based on the synergistic effect of dynamic hydrogen bonds and flexible disulfide bonds of a self-repairing polyurea elastomer structure in the composite coating, the self-repairing characteristic of the composite coating is remarkably enhanced, meanwhile, a brick mud structure is formed through uniform embedding of MXene at carbon dots, and the mechanical strength, corrosion resistance, heat stability and rapid self-repairing capacity of the composite coating are greatly improved.

The invention discloses a sulfur-containing solid polymer electrolyte membrane for an energy storage battery as well as a preparation method and application of the sulfur-containing solid polymer electrolyte membrane, and belongs to the technical field of polymer electrolyte. The preparation method of the sulfur-containing solid polymer electrolyte membrane comprises the following steps: uniformly mixing dimethyl tetrasulfide and dithiodibenzoic acid, and carrying out condensation polymerization to obtain a solid polymer; the preparation method comprises the following steps: dissolving a solid polymer in N, N-dimethylformamide to obtain a mixed solution, adding lithium bis (trifluoromethanesulfonyl) imide into the mixed solution, and uniformly mixing to obtain a precursor solution; and performing electrostatic spinning on the precursor solution to form a fiber membrane, and performing vacuum drying to obtain the sulfur-containing solid polymer electrolyte membrane. According to the sulfur-containing solid polymer electrolyte membrane provided by the invention, through a four-dimensional synergistic conduction mechanism, unified synergy of improvement of ionic conductivity, enhancement of interface stability and optimization of mechanical properties is realized. The lithium metal battery assembled by the electrolyte membrane has the comprehensive advantages of high safety, long cycle life, excellent electrochemical performance and the like.

The invention belongs to the technical field of batteries, and particularly relates to a silicon-carbon negative electrode material based on spheroid phenolic resin and a preparation method thereof.The preparation method comprises the steps that a phenolic monomer, an aldehyde monomer, a basic catalyst and a pore-foaming agent are mixed in deionized water to form a water phase, then an oil phase containing the oil monomer and an emulsifier is added into the water phase, and the mixture is stirred to be uniform; carrying out inverse emulsion polycondensation reaction, and curing to obtain sphere-like phenolic resin; the preparation method comprises the following steps: heating spheroidic phenolic resin, carrying out pre-oxidation treatment, heating in an inert atmosphere, carrying out carbonization reaction, cooling, dipping in an activator, and carrying out gradient activation treatment to obtain spheroidic porous carbon; the spheroid porous carbon is degassed under vacuum and then placed in a chemical vapor deposition reaction cavity, silicon source gas is introduced for deposition reaction after heating, a deposition precursor is obtained, the outer surface of the deposition precursor is coated with a carbon source and a nitrogen source, and the silicon-carbon negative electrode material based on the spheroid phenolic resin is obtained after high-temperature reaction. And the problems of cycle attenuation and rate capability reduction are effectively solved.

The invention discloses transparent copolyester, a preparation method thereof and a product prepared from the copolyester. The preparation method comprises the following steps: carrying out esterification or ester exchange reaction on dibasic acid or dimethyl ester of the dibasic acid and dihydric alcohol at 5-300kPaG to obtain an esterified substance or an ester exchange substance; then, the normal pressure of the system is recovered, the esterification or ester exchange temperature is kept unchanged, the negative pressure of the ester or ester exchange material is gradually reduced to high vacuum according to a certain pressure reduction rate, excessive monomers are removed, the content of impurities generated by the ester or ester exchange material is 0.3 wt% or below, and a prepolymer is obtained; and further heating the prepolymer, and carrying out final polycondensation reaction under high vacuum to obtain the target copolyester. The method can effectively weaken the side reaction in the synthesis process, improve the hue of the copolyester product, improve the light transmittance, reduce the haze and improve the heat resistance. Products prepared from the copolyester, such as bottle materials, sheets, plates and membrane materials, have the characteristics of light color, high transparency and good heat resistance.

The invention provides a metal-doped porous carbon material, a metal-doped silicon-carbon composite material, a preparation method and application of the metal-doped porous carbon material and the metal-doped silicon-carbon composite material, and a lithium ion battery, and belongs to the technical field of carbon materials. The preparation method comprises the following steps: mixing a phenolic compound, an aldehyde compound, a surfactant, an alkaline reagent, a metal compound and water, and carrying out addition-polycondensation reaction on the obtained mixed material liquid to obtain metal-doped phenolic resin; and sequentially carrying out re-curing treatment, pyrolysis treatment and activation treatment on the metal-doped phenolic resin to obtain the metal-doped porous carbon material. According to the metal-doped porous carbon material prepared by the method disclosed by the invention, metal is uniformly doped in the porous carbon material, and on the basis, silicon is deposited to obtain the metal-doped silicon-carbon composite material; the metal-doped silicon-carbon composite material as a negative electrode material of a lithium ion battery has relatively high initial coulombic efficiency and relatively good rate capability and cycle performance.

The invention provides a preparation and purification method of a p-xylylene dicamphor sulfonate crystal form, which comprises the following steps: carrying out condensation polymerization on camphorsulfonic acid and terephthalaldehyde under the action of organic alkali to prepare p-xylylene dicamphor sulfonate, carrying out post-treatment, dissolving, clarifying and layering, dropwise adding ethanol, and sequentially carrying out first crystal growing and second crystal growing to obtain the p-xylylene dicamphor sulfonate crystal form. The preparation method comprises the following steps: dissolving p-xylylene dicamphor sulfonate in water to obtain a crude product of the p-xylylene dicamphor sulfonate crystal form, decolorizing the crude product, and carrying out gradient cooling crystallization, so that the high-purity p-xylylene dicamphor sulfonate crystal form product with high yield can be prepared, the content of impurities in the product is effectively controlled, the irritation of the impurities to the skin is reduced, and the safety of the product is improved. Meanwhile, the product has a crystal form, the moisture absorption of the product can be improved, and storage is easy.