1368 results about "Polycondensation reaction" patented technology

The invention discloses metal element-doped nano silicon carbon as well as a preparation method and application thereof, and relates to the field of negative electrode materials. The nano silicon carbon takes porous carbon as a carbon skeleton, and the porous carbon is sequentially attached with nano silicon and coated with a carbon material layer through a chemical vapor deposition method; the porous carbon is prepared by carbonizing resin containing metal nitride after alkali activation and pore forming, and the resin containing the metal nitride is prepared by condensation polymerization of a phenolic compound, an aldehyde compound and the metal nitride in the presence of a catalyst. The porous carbon is doped with the metal nitride in the resin polycondensation process, the conductivity of the nano silicon carbon is effectively improved, the powder resistance is reduced, holes in the surface of the porous carbon provide more expansion space for deposited nano silicon, a carbon material layer formed by subsequent deposition and coating provides a protection effect, the reaction between silicon and an electrolyte can be inhibited, and the service life of the nano silicon carbon is prolonged. A stable SEI film is formed, the cycling stability of the material is improved, the volume expansion rate of a pole piece is inhibited, and the cycling life and the stability of the battery are improved.

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 field of quantum dot ink, and discloses diffusion plate printing quantum dot ink and a preparation method thereof.The diffusion plate printing quantum dot ink comprises acrylic resin, hyperbranched polyester resin, a quantum dot material, modified boron nitride, a reactive diluent, a photoinitiator, a wetting agent and a defoaming agent; the hyperbranched polyester resin is prepared by reacting hyperbranched polyester acrylate and a sulfydryl-terminated silicon-containing reaction monomer, wherein the hyperbranched polyester acrylate is prepared by reacting pentaerythritol with 2, 2-dimethylolpropionic acid and then carrying out esterification reaction with acrylic acid; the sulfydryl-terminated silicon-containing reaction monomer is prepared by reacting eugenol with 1, 1, 3, 3-tetramethyldisiloxane and then carrying out esterification reaction with 3-mercaptopropionic acid; the modified boron nitride is prepared by modifying a cationic polymer which is prepared by carrying out a Mannich reaction on triethylene tetramine, formaldehyde and acetone and then carrying out a condensation polymerization reaction with formaldehyde. After the ink prepared by the invention is cured, a coating film is high in hardness, adhesive force and heat conductivity coefficient, and good in flexibility, heat resistance and migration barrier property.

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 provides bio-based nylon 12 and a preparation method thereof. The preparation method comprises the following steps: a) adding 12-amino dodecanoic acid inner salt, a catalyst, an antioxidant and a molecular weight regulator into a reaction kettle, filling inert shielding gas into the reaction kettle, and carrying out prepolymerization reaction to obtain a prepolymer; b) performing condensation polymerization on the prepolymer obtained in the step a) to obtain a condensation polymer; and c) sequentially carrying out melt blending, extrusion, cooling and granulation on the polycondensate obtained in the step b) to obtain the bio-based nylon 12. Compared with the prior art, the preparation method provided by the invention has the advantages that the bio-based nylon monomer 12-amino dodecanoic acid inner salt is adopted as a raw material and is matched with other raw material components, polymerization is carried out under specific process steps, overall better interaction is realized, and the prepared ultra-high molecular weight full bio-based nylon 12 is high in product molecular weight, free of coking and good in comprehensive performance.

Disclosed are a resin substrate-based iron oxyhydroxide desulfurizing agent and a preparation method therefor, falling within the technical field of gas purification and treatment. In the present disclosure, sodium percarbonate is used as a raw material to prepare iron oxyhydroxide. Sodium percarbonate serves both as an alkaline precipitant and as an oxidant. P-aminophenol and formaldehyde are subjected to condensation polymerization to form linear phenolic resin, which is then modified with terephthalyl alcohol to connect into a cross-linked network structure resin. The resin is used as a substrate to obtain the resin substrate-based iron oxyhydroxide desulfurizing agent. The preparation method of the present disclosure is simple and achieves a larger sulfur capacity and desulfurization efficiency, making it suitable for the removal of hydrogen sulfide from waste gas.

The invention relates to the technical field of catalyst materials, in particular to an MOF-based polyester polycondensation catalyst and a preparation method and application thereof. The preparation method comprises the following steps: weighing MOF-5, adding into DMF (Dimethyl Formamide), and carrying out ultrasonic dispersion to obtain a suspension; weighing a titanium source, adding the titanium source into DMF, stirring and dissolving to obtain a titanium solution; and adding a titanium solution into the suspension liquid under stirring, stirring for 6-24 hours at the temperature of 60-120 DEG C and the speed of 300-1000 rpm, filtering, and drying the obtained solid product to obtain the Ti-MOF-5 polyester polycondensation catalyst. Ti < 4 + > is introduced into an MOF-5 framework, the Lewis acidity of the MOF-based polyester polycondensation catalyst is enhanced, Ti < 4 + > serving as a Lewis acid center can effectively activate ester groups and hydroxyl groups in a PET polycondensation reaction, so that reaction activation energy is reduced, the polycondensation reaction is accelerated, the Ti-MOF-5 catalyst has relatively low toxicity and relatively high biocompatibility, and compared with a traditional antimony catalyst, the Ti-MOF-5 catalyst has the advantages that the molecular weight of the Ti-MOF-5 catalyst is reduced, and the molecular weight of the Ti-MOF-5 catalyst is reduced. The Ti-MOF-5 not only can improve the reaction efficiency, but also meets the requirements of environmental protection and sustainable development.

A high-strength PA6 composite material and a preparation method therefor, the PA6 composite material comprising, in parts by mass, 80-95 parts of caprolactam, 1-3 parts of benzoic acid and 10-30 parts of a modification additive. The benzoic acid is used for improving the tensile strength of the composite material, and the modification additive is used for enhancing the impact resistance of the composite material. Terephthalic acid and m-xylylenediamine undergo a reaction to generate m-xylylenediamine terephthalate, which is then subjected to a polycondensation reaction with caprolactam, so as to introduce same into the backbone of a PA6 molecule and modify the PA6 resin. The modified PA6 resin has remarkably improved tensile strength and impact resistance, so that the application range of the PA6 composite material can be greatly expanded.

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 field of high polymer materials, and discloses a preparation method and application of high-temperature-resistant transparent modified polyester. The preparation method comprises the following steps: 1) blending 9, 9-di-[(4-phenylphenoxy) dibenzoic acid] fluorene with diacid and dihydric alcohol, and carrying out esterification reaction; and 2) carrying out condensation polymerization on the esterification product to obtain the high-temperature-resistant transparent modified polyester with the glass transition temperature of more than 70 DEG C. According to the invention, 9, 9-di-[(4-phenylphenoxy) dibenzoic acid] fluorene is used as a modification monomer, and is copolymerized with other dibasic acids and dihydric alcohols to synthesize the modified polyester, and the modified polyester has high transparency and still has good mechanical properties and dimensional stability at high temperature. Therefore, the high-temperature-resistant transparent modified polyester is applicable to the application fields of optical films, optical lenses, reflective protective films, optical fibers or liquid crystal displays and the like.

The invention provides a synthesis method of bio-based poly (ethylene 2, 5-furandicarboxylate) (poly (ethylene 2, 5-furandicarboxylate) for short) and performance application of the bio-based poly (ethylene 2, 5-furandicarboxylate). According to the method, 2, 5-furandicarboxylic acid (FDCA) derived from renewable resources and ethylene glycol (EG) are used as main raw materials, and the high-molecular-weight PEF is prepared through microwave-assisted esterification-polycondensation reaction under the action of a metal catalyst. The prepared PEF has excellent thermal mechanical property and gas barrier property, the glass transition temperature is about 58.6 DEG C, the melting temperature is about 187.4 DEG C, and the thermal decomposition 18% weight loss temperature exceeds 400 DEG C. The PEF material can be biologically degraded under the industrial composting condition, and the degradation speed is higher compared with that of traditional petroleum-based PET polyester. The PEF provided by the invention is suitable for the fields of food packaging films, beverage bottles and fiber materials, has the advantages of biodegradability, heat resistance stability and high barrier property, can partially replace polyethylene glycol terephthalate (PET) and other petrochemical plastics, and meets the requirements of sustainable development.

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 discloses a full bio-based copolymer based on a citric acid bicyclic monomer, a preparation method and an application, and belongs to the technical field of material synthesis, citric acid-derived bicyclic OPD diol and OPBMC diester are synthesized through oxidation reduction and transesterification, and then 1, 4-butanediol is partially replaced with OPD or 2, 4-butanediol is partially replaced with OPBMC through melt phase polycondensation reaction. Two series of random copolyester PBxOyF copolymer and PBOmFn copolymer of the PBF are prepared by adding 2, 5-dimethyl furandicarboxylate into the PBF, and then adding the PBxOyF copolymer and the PBOmFn copolymer into the PBF. According to the full-bio-based copolymer based on the citric acid bicyclic monomer, the preparation method and the application, the citric acid bicyclic monomer obviously improves the glass transition temperature and shows good mechanical properties; therefore, the bicyclic monomer based on citric acid has huge potential in the aspect of synthesizing novel bio-based copolyester with expected thermodynamic properties, and is expected to further expand the application range of the 2.5 furandicarboxylic acid-based polyester.

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 relates to the technical field of sound absorption materials, in particular to an aerogel and cork composite sound absorption material with a dual-scale pore structure and a preparation method. The preparation method of the aerogel-softwood composite sound absorption material with the double-scale pore structure comprises the following steps that softwood particles subjected to microwave treatment are placed in a SiO2 aerogel precursor solution to be subjected to vacuum impregnation treatment, then hydrolysis and condensation polymerization are conducted, a three-dimensional network structure is formed through crosslinking, freeze drying is conducted after water soaking, and the aerogel-softwood composite sound absorption material with the double-scale pore structure is obtained. SiO2 aerogel and cork composite particles are obtained; and spraying a polyurethane adhesive into the SiO2 aerogel and cork composite particles, and then carrying out hot press molding to obtain the aerogel and cork composite sound absorption material with the dual-scale pore structure. According to the preparation method, microwave treatment and dipping treatment are combined, so that the sound absorption performance of the prepared aerogel and cork composite sound absorption material with the double-scale pore structure is improved, and the problem that sound absorption is not facilitated due to the unique cell structure of cork is solved.

The invention discloses a process method for preparing a multi-component aramid copolymer through continuous polymerization, and relates to the technical field of high polymer material preparation, and the process method comprises the following steps: S1, preparing a premix: weighing one or more aromatic diamine monomers according to a certain mass ratio, dissolving the aromatic diamine monomers in an amide solvent or a solvent compounded by amides and hydrotropy salt, and stirring to obtain the premix; uniformly stirring and dissolving in a reaction kettle under the protection of a nitrogen environment to form a premix; s2, low-temperature pre-polycondensation reaction; s3, low-temperature polycondensation reaction; s4, post-treatment: neutralizing, washing and drying the multi-element aramid polymer powder obtained in S3, and removing the solvent and the hydrotropy salt to obtain pure and uniform-particle brown yellow powder; or the obtained polymerization stock solution is neutralized, defoamed and filtered to obtain a spinning stock solution, the intrinsic viscosity of the processed brown yellow powder or spinning stock solution is larger than 4.5 dL / g, the polymer powder / polymerization solution can be used for preparing the multi-element aramid fiber through spinning, and the method effectively reduces the industrial production cost of the multi-element cyclic aramid fiber and improves the production efficiency.

The invention belongs to the technical field of lithium organic batteries, and provides a conjugate extended lithium-containing organic positive electrode material and a preparation method and application thereof. The synthesis process of the positive electrode material comprises the following steps: firstly, taking tetraamino p-benzoquinone as a raw material, and carrying out oximation modification reaction on the tetraamino p-benzoquinone to generate tetraamino p-oximic acid; then, carrying out composite treatment on the TAPO and a lithium source to obtain lithium tetraamino p-oximate; and finally, through a condensation polymerization reaction, further preparing to obtain the polybenzoquinone-pyrazine extended lithium oximate. Through specific chemical treatment, the organic material contains a lithium element, so that the dependence on an external lithium source (such as a metal lithium negative electrode or a lithium supplement agent) is eliminated. Through ingenious molecular design and synthesis strategies, the conductivity of the material is improved, and the rate capability, the solubility resistance, the high-temperature stability and the cycle life of the material are remarkably enhanced, so that a solid foundation is laid for long-term stable operation and high-performance expression of a battery.

The invention relates to the technical field of phenolic resin preparation, in particular to high-temperature-resistant silicon-boron dual-modified phenolic resin and a preparation method thereof.The preparation method comprises the steps that firstly, specific silane, phenylboronic acid, a specific catalyst and ethyl alcohol are added into a reactor, after the reaction is completed, reduced pressure distillation is conducted to remove ethyl alcohol, and a boron-silicon modifier is obtained; 2, mixing a phenolic compound with a dehydrating agent, stirring, heating, sequentially adding a borosilicate modifier and a basic catalyst, adjusting the pH value, and carrying out a dehydration esterification reaction under a reduced pressure condition; 3, after the esterification reaction is finished, an aldehyde compound is added, stirring and heating are conducted, decompression dehydration and addition polycondensation reaction are conducted at the same time, and finally the boron-silicon modified phenolic resin is prepared. In the scheme, high-bond-energy boron-oxygen bonds and silicon-oxygen bonds are introduced into the phenolic resin, part of phenolic hydroxyl groups are blocked, the number of phenolic resin benzene rings is increased, and therefore the phenolic resin is prepared; the synthesized borosilicate phenolic resin has high residual carbon content and excellent high temperature resistance, ablation resistance and oxidation resistance, and has a wide application prospect.

A preparation method of a polyester nanofiltration membrane with high chlorine resistance and pollution resistance relates to the technical field of chlorine-resistant polyester nanofiltration membranes, and comprises the following steps: sequentially dipping a polyacrylonitrile support layer in an aqueous phase solution and an oil phase solution, carrying out condensation polymerization at 25-45 DEG C to generate a polyester selection layer on the surface, and finally heating and crosslinking at 45-65 DEG C to obtain the polyester nanofiltration membrane. The aqueous phase solution is a tannic acid aqueous solution, a rhamnose aqueous solution, a vitamin C aqueous solution or a chlorogenic acid aqueous solution, the preparation method is simple and low in cost, and the formed polyester nanofiltration membrane has high chlorine resistance and pollution resistance.

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 invention provides a preparation method of a block poly (biphenyl-trifluoroacetophenone-piperidone) bicontinuous hollow fiber loose nanofiltration membrane, which comprises the following steps: adding acid into biphenyl and N-methyl-4-piperidone to react to obtain a first product; adding acid into biphenyl and 2, 2, 2-trifluoroacetophenone to react, so as to obtain a second product; adding the second product into the first product, and carrying out condensation polymerization to obtain a PBTbBP block polymer; dissolving the PBTbBP block polymer in a solvent, and defoaming to obtain a membrane casting solution; spinning the membrane casting solution and the core solution to obtain membrane filaments; and immersing the membrane filaments in a coagulating bath, and carrying out phase separation. According to the preparation method, biphenyl, a hydrophobic trifluoroacetophenone monomer and a hydrophilic N-methyl piperidone monomer are subjected to superacid catalysis Friedel-Crafts reaction and are subjected to step-by-step copolymerization to obtain the amphiphilic block polymer PBTbBP. The membrane has efficient mass transfer channels and excellent membrane surface hydrophilicity, and the separation capacity of dye molecules and salt ions and the water permeability are improved.

The invention relates to the technical field of polyimide fibers, in particular to a method for preparing polyimide fibers of different color systems based on in-situ coloring, which comprises the following steps: carrying out condensation polymerization on perylene tetracarboxylic dianhydride compounds or perylene diimide, diamine monomers and dianhydride monomers to obtain a polyamide acid solution; adding acetic anhydride and pyridine into the polyamide acid solution for chemical ring-closure reaction to obtain a polyimide solution; and carrying out wet spinning on the obtained polyimide solution to obtain the colored polyimide fiber. The method for preparing the polyimide fibers of different color systems based on in-situ coloring is simple in process and environmentally friendly, and the prepared polyimide fibers of different color systems are high in color fastness and excellent in mechanical property.

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 provides a lithium-doped porous carbon material, a lithium-doped silicon-carbon composite material, a preparation method and application of the lithium-doped porous carbon material and the lithium-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 lithium source, a first phenolic compound and a first solvent, and carrying out modification treatment to obtain modified product feed liquid; mixing the modified product feed liquid, an aldehyde compound, a second phenolic compound and a second solvent, and carrying out addition-polycondensation reaction to obtain lithium modified phenolic resin; the lithium modified phenolic resin is subjected to pyrolysis treatment and activation treatment in sequence, and the lithium-doped porous carbon material is obtained. Silicon is deposited on the lithium-doped porous carbon material provided by the invention to obtain a lithium-doped silicon-carbon composite material, and the lithium-doped silicon-carbon composite material has relatively high initial coulombic efficiency and relatively good rate capability and cycle performance when being used as a negative electrode material of a lithium ion battery.

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 invention relates to the field of polyurethane, and discloses a preparation method of a linear reaction type phosphorus-nitrogen-silicon synergistic flame-retardant solvent-free polyurethane coating, which comprises the following steps: S1, carrying out exchange reaction on phosphonate and alcohol amine ester to obtain a phosphorus-nitrogen polyol intermediate; s2, carrying out condensation polymerization on the phosphorus-nitrogen polyol intermediate and chlorosilane to obtain phosphorus-nitrogen-silicon polyol; s3, mixing polyester / polyether polyol, a chain extender and an amine / metal catalyst to obtain a component A; mixing and reacting isocyanate, part of polyester / polyether polyol and phosphorus-nitrogen-silicon polyol to obtain a component B; mixing the component A and the component B, spraying the mixture on release paper, and curing. Through a synergistic flame-retardant mechanism of phosphorus, nitrogen and silicon, the balance of efficient flame retardance, mechanical properties and excellent coating properties is realized. The solvent-free system realizes zero emission of volatile organic compounds, and the linear reaction type design ensures that the mechanical properties and durability of the coating are not influenced.

The invention belongs to the technical field of copolymerization modification of degradable polyester, and discloses a preparation method of tertiary amine modified rapidly degradable polyester, which comprises the following steps: in the presence of a catalyst and an auxiliary agent, carrying out esterification, pre-polycondensation and polycondensation on tertiary amine, dibasic acid and dihydric alcohol to prepare the tertiary amine modified rapidly degradable polyester, the structural formula of the tertiary amine is RN (CH2CH2OH) 2, R is a side group, and the side group at least contains one hydroxyl group. The preparation method is simple and easy to implement, the prepared tertiary amine modified rapidly degradable polyester can be hydrolyzed, the mass loss within 49 days can reach 3-20%, especially hydrolysis can be further accelerated after oxidation treatment, and meanwhile the breaking strength of copolyester is enhanced.

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.