737 results about "Aldehyde formation" patented technology

The invention relates to the field of copper-clad plates, and discloses a high-performance flame-retardant low-dielectric-loss copper-clad plate and a preparation method thereof.The copper-clad plate comprises epoxy resin, benzoxazine resin, composite filler, carboxyl-terminated nitrile rubber, an active diluent, a curing agent and the like; the composite filler is prepared by compounding flame-retardant modifier grafted graphene oxide and epoxy silane modified silicon dioxide hollow spheres; according to the flame-retardant modifier, boric acid and pentaerythritol are used for preparing a double-terminal hydroxyl boron-containing intermediate, then dichlorodiphenyl silane and phenylphosphonic dichloride react with hydroxyl groups at the two ends of the intermediate to prepare a flame-retardant intermediate, and amino silane and vanillic aldehyde react with chlorine atoms at the two ends of the intermediate to prepare an aldehyde modified flame-retardant intermediate; the copper-clad plate prepared by the preparation method disclosed by the invention is low in dielectric constant and dielectric loss, high in heat conductivity coefficient and good in flexibility, and also has excellent heat resistance and flame retardance.

The invention discloses a nitrogen-containing carbon hollow sphere supported cobalt-based catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalyst preparation. According to the preparation method, ammonia water, tetraethyl orthosilicate, polyoxyethylene polyoxypropylene ether triblock copolymer, resorcinol and a formaldehyde solution are fully reacted in a mixed solvent of deionized water and ethanol by virtue of a template method, and the nitrogen-containing carbon hollow spheres are obtained after calcination and etching; then carrying out surface modification on the nitrogen-containing carbon hollow spheres, and uniformly loading cobalt metal by virtue of the structure guiding effect of hexamethyleneimine and sodium citrate dehydrate; the prepared nitrogen-containing carbon hollow sphere supported cobalt-based catalyst has abundant highly-exposed Co-N-C active sites, has wide substrate universality, has good catalytic activity and selectivity for amination reactions with various long-chain fatty aldehydes, fatty ketones, cyclic fatty ketones, aromatic aldehydes and ketones as raw materials, and can realize efficient catalytic amination reactions of carbonyl compounds.

Provided herein are processes for preparing Compound A or a salt thereof, comprising admixing Compound B or a salt thereof and crotonaldehyde in the presence of an acid catalyst and a solvent to form Compound A

Various processes for the pyrolysis of carbohydrates to prepare products such as glycolaldehyde are described. Also, various catalysts and processes for preparing catalysts useful for carbohydrate pyrolysis are described.

The invention provides a method for in-situ preparation of a covalent organic framework mixed matrix membrane. The method mainly comprises the following steps: dissolving a film-forming polymer, a pore-forming agent and an aldehyde monomer in a solvent, stirring and heating to prepare a film casting solution; dissolving an amino monomer in water to prepare a coagulating bath; a glass plate is coated with the membrane casting solution to form a liquid membrane, the liquid membrane is immersed in a coagulating bath, in the process, macromolecules are separated out to form a membrane, and an amino monomer in the coagulating bath reacts with an aldehyde group monomer in the membrane casting solution to form an amorphous macromolecular network; and putting the membrane into a solvent added with a catalyst, and heating to obtain the covalent organic framework mixed matrix membrane. The method mainly has the advantages that the amido monomer and the aldehyde group monomer are respectively added into the coagulating bath and the membrane casting solution, so that the reaction process of the two monomers is matched with the precipitation process of the polymer matrix, and the synergistic reinforcement of the periodic nanopores of the covalent organic framework filler and the excellent membrane forming property of the polymer matrix is realized.

The invention relates to the technical field of automobile air purification, and particularly discloses a filtering material, a preparation method of the filtering material and a novel automobile air conditioner multi-effect catalytic formaldehyde removal filter. The filtering material comprises a PET (Polyethylene Terephthalate) supporting layer, a gas filtering layer and a PP (Polypropylene) electrostatic filtering layer which are arranged in sequence, the gas filtering layer is prepared from the following raw materials in parts by weight: 30 to 90 parts of activated carbon and 10 to 70 parts of manganese catalyst. The gas filtering layer composed of the activated carbon and the manganese catalyst is matched with the filtering material composed of the PET supporting layer and the PP electrostatic filtering layer, four gases of n-butane, methylbenzene, sulfur dioxide and nitrogen dioxide can be adsorbed, the manganese catalyst degrades formaldehyde at normal temperature, meanwhile, the reaction on the formaldehyde is a catalytic reaction, and the environment-friendly effect is achieved. Therefore, the filter material disclosed by the invention also has longer service life, so that a filter made of the filter material has a better formaldehyde removal effect and longer service life.

The invention provides a preparation method of a formaldehyde-free veneer artificial board, which comprises the following steps: (1) an adhesive is applied to the surface of a veneer, the adhesive is composed of a part A and a part B. The part A is one or more of isocyanate or modified isocyanate, or a mixture of the isocyanate and one or more of dimorpholinyl diethyl ether and sulfolane, or a mixture of the isocyanate and the modified isocyanate, or a mixture of the isocyanate and the modified isocyanate, or a mixture of the isocyanate and the modified isocyanate and one or more of dimorpholinyl diethyl ether and sulfolane, or a mixture of the isocyanate and the modified isocyanate; the part B is a hydroxyl-terminated compound or a mixture of the hydroxyl-terminated compound, a catalyst and one or more of sulfolane, preferably, the glue applying amount of the part B in different layers of veneers is different, and the applying amount is gradually increased from the surface layer veneer to the core layer veneer; (2) forming a plate blank by the veneers according to a certain rule; and (3) feeding the plate blank into a hot press to prepare the formaldehyde-free added veneer type artificial board. The method for producing the formaldehyde-free veneer type artificial board is simple and easy in process, high in hot-pressing production efficiency, excellent in mechanical property, good in flatness and low in warping degree, and can resist boiling in boiling water for 72 hours.

The invention relates to a low-ice-adhesion super-hydrophobic anti-icing coating as well as a preparation method and application thereof. Single-end amino fluorosilicone oil is grafted to the surface of an aldehyde group functionalized metal organic framework material through an amino-aldehyde group condensation reaction to obtain a hydrophobically modified metal organic framework material, the hydrophobically modified metal organic framework material is compounded with a synthesized fluorinated acrylate copolymer, and the coating is prepared through ultrasonic dispersion and spraying curing processes. According to the prepared low-ice-adhesion super-hydrophobic anti-icing coating, through the synergistic effect of fluorosilane grafting modification and a micro-nano structure, the excellent performance that the static water contact angle is larger than or equal to 160 degrees, the rolling angle is smaller than or equal to 2 degrees, and the ice adhesion strength is smaller than or equal to 20 kPa is achieved. Compared with a traditional anti-icing coating, a metal organic framework material functional modification strategy is adopted, the ice adhesion force is remarkably reduced while the mechanical stability of the coating is kept, and uniform film forming on the surfaces of base materials such as aluminum wires can be achieved through the spraying technology. The coating is suitable for anti-icing protection of the aluminum conductor of the power transmission line, and has the characteristics of long-acting icing resistance and low ice adhesion.

The present invention discloses a titanium dioxide / manganese dioxide / carbon composite catalyst supported on a macroscopic carrier, a preparation method thereof and an application. The preparation process is as follows: titanium dioxide is added to deionized water, stirred, potassium permanganate is added, and stirring is continued; a carbon source is added, after stirring evenly, a macroscopic carrier is added, ultrasonic mixing is carried out, and reaction is carried out under water bath conditions. After the reaction is completed, it is cooled and dried to obtain the product. Compared with the existing formaldehyde removal materials, through the mutual synergistic effect among the components of the composite catalyst in the present invention, that is, the photo-thermal synergistic catalytic oxidation under light conditions and the adsorption / catalytic oxidation under dark conditions act together to mineralize formaldehyde into environmentally harmless water and carbon dioxide. In addition, the preparation method of the present invention has a simple operation process and low raw material prices. Combining the support on a macroscopic carrier and the synergistic effect among the composite catalysts, it has the characteristics of a wide range of applicable scenarios, convenient subsequent recovery, and all-weather formaldehyde removal, and has broad application prospects.

The invention discloses a full-bio-based multifunctional antibacterial nylon material as well as a preparation method and application thereof, relates to the technical field of high-molecular polymers, and solves the problems that the preparation process of a nylon material in the prior art depends on petroleum resources, the function is single and the application scene is limited. The method comprises the following steps: reacting an aminocaprolactam solution with corresponding aldehyde / carboxylic acid / halogenated alkane, and purifying to obtain a cyclic lysine derivative monomer M; the preparation method comprises the following steps: mixing and heating a cyclic lysine derivative monomer M, an initiator and a catalyst, reacting, and purifying to obtain a nylon material PM; and carrying out quaternization reaction on the nylon PM solution and alkyl halide, and purifying to obtain the full-bio-based multifunctional nylon material P. The preparation method completely abandons the use of petroleum-based raw materials, realizes the multifunctional synergistic effect of antibacterial property, biocompatibility, antibacterial biofilm property, thermosensitivity and the like, and can be applied to the fields of antibacterial materials, biomedical materials, antibacterial biofilms and thermosensitivity materials.

The invention provides a cyclodextrin-based nano anti-tumor medicine preparation as well as a preparation method and application thereof, and belongs to the technical field of medicines. The preparation method comprises the following steps: preparing a graphene quantum dot deposition gold nanocage modified by a silane coupling agent, carrying out a Schiff base reaction on the graphene quantum dot deposition gold nanocage and aldehyde substituted-beta-cyclodextrin to prepare a composite carrier, and coating a targeted peptide-drug compound through the reaction, thereby preparing the cyclodextrin-based nano anti-tumor drug preparation. According to the cyclodextrin-based nano anti-tumor medicine preparation prepared by the invention, the anti-tumor medicine effect is obviously improved, meanwhile, the medicine resistance of the medicine can be reversed, the damage to normal tissues is reduced, the use amount of the medicine is reduced, the side effect after the medicine is used is reduced, the compliance of a patient is improved, and meanwhile, the stability and biocompatibility of the medicine can be improved; wide application prospects are realized.

The invention discloses a dynamic semi-interpenetrating composite network structure material of thermosetting polyimide prepolymer modified polyimine. The network is composed of two components, namely a thermosetting polyimide prepolymer and a dynamic polyimine network matrix. Wherein the polyimide prepolymer takes an anhydride-terminated active monomer as an end-capping reagent to form a prepolymer, and the polyimine network matrix is formed by a dynamic covalent cross-linking reaction of aldehyde and amine monomers or a cross-linking agent in a specific ratio. By regulating and controlling the content of the thermosetting polyimide prepolymer, collaborative optimization of mechanical properties, thermal stability and dynamic characteristics of the dynamic high polymer material is realized. The tensile strength of the modified dynamic semi-interpenetrating composite network is improved to 23 MPa (50% higher than that of an unmodified system), the 30% thermal weight loss temperature and the 800 DEG C carbon residue rate under the nitrogen atmosphere are both improved, meanwhile, the recoverable characteristic of dynamic imine bonds is kept, and the dynamic semi-interpenetrating composite network can be depolymerized and recovered under the acidic condition. In addition, the novel dynamic adhesive can be applied to the fields of ocean engineering, national defense and military industry and the like.

The invention relates to an olefin hydroformylation homogeneous catalysis continuous reaction process and system. The process comprises the following steps: mixing raw materials olefin, synthesis gas and a metal catalyst, and then carrying out hydroformylation reaction; removing a light component containing the product aldehyde from the hydroformylation reaction liquid to obtain a heavy component containing the metal catalyst; uniformly mixing the heavy component with a first extraction agent, and performing phase splitting to obtain a first heavy component phase and a first extraction agent phase; a metal catalyst and a second extraction agent are separated from the first extraction agent phase, the metal catalyst is circularly used for the hydroformylation reaction, and the second extraction agent is used as the first extraction agent mixed with the heavy components. Based on the characteristics of solubility difference and specific gravity difference between the metal catalyst and other substances in the heavy components under specific conditions, the heavy components in a reaction system are reacted at a lower temperature on the premise of not additionally adding a reagent which can influence the activity of the catalyst, and the activity of the catalyst can be well maintained within a longer reaction time.

The invention discloses a sodium ion battery conductive agent and a preparation method thereof, and belongs to the technical field of sodium ion batteries. The sodium ion battery conductive agent comprises a hyperbranched polymer and a carbon-based conductive material, the hyperbranched polymer catalyzes 2-thiophenecarbonitrile through trifluoromethanesulfonic acid to generate 2, 4, 6-tri (2-thienyl)-1, 3, 5-triazine through polymerization, then aldehyde groups are introduced to prepare thienyl triazinyl formaldehyde, and the thienyl triazinyl formaldehyde reacts with 2, 4, 6-tri (4-aminophenyl)-1, 3, 5-triazine to prepare the sodium ion battery conductive agent. A triazine structure in the hyperbranched polymer in the conductive agent prepared by the invention is cooperated with a thiophene unit, so that the conjugation effect and the electron transmission efficiency can be remarkably enhanced; the flexible and hyperbranched structure of the thiophene ring can buffer volume expansion in the charging and discharging process, and the cycle performance is prolonged; the hyperbranched polymer can be effectively cross-linked with the carbon-based conductive material to form a multi-path transmission channel, so that the charging specific capacity of the battery is improved.

Provided is a compound and so on having aldehyde dehydrogenase 2 (ALDH2) activation effect. A compound, a pharmaceutically acceptable salt of the compound, or a prodrug of the compound or the salt, the compound being represented by the following formula (1):whereinA is a heterocycle,R1 and R2 are each independently hydrogen, an alkyl, an alkenyl, or an alkynyl,R3 is an alkyl, an alkenyl, or an alkynyl, andX1 and X2 are each independently a halogen.

The invention belongs to the technical field of sodium ion batteries, and relates to a preparation method of modified asphalt-based hard carbon microspheres for a negative electrode of a sodium ion battery. The preparation method comprises the following steps: (S1) oxidizing asphalt powder to obtain oxidized asphalt; (S2) modifying the oxidized asphalt by thienyl silane to obtain thienyl silane modified asphalt; (S3) adding the thienyl silane modified asphalt, thiophene aldehyde, an oxidant and a surfactant into water, and reacting at 40-65 DEG C for 5-8 hours; adding an acidic catalyst, and reacting at 80-95 DEG C for 3-6 hours to obtain modified asphalt microspheres; and (S4) sequentially carrying out low-temperature pre-carbonization and high-temperature carbonization on the modified asphalt microspheres to obtain the modified asphalt-based hard carbon microspheres for the negative electrode of the sodium-ion battery. According to the invention, asphalt is modified to obtain an asphalt-polythiophene precursor with a compact network structure, namely the modified asphalt microspheres, and the hard carbon microspheres formed by segmented carbonization have excellent electrochemical performance when being used as the negative electrode of the sodium-ion battery.

A recycle content ethylene is fed to a reactor to make propionaldehyde having recycle content. The recycle ethylene feedstock is derived directly or indirectly from the cracking of recycle content pyrolysis oil. The cracking of the pyrolysis oil can be conducted in a gas furnace or a split furnace.

In a secondary battery including an electrolyte layer containing a sulfide solid electrolyte, the electrolyte layer has both high voltage resistance and high ionic conductivity. The secondary battery of the present disclosure includes a positive electrode, an electrolyte layer, and a negative electrode, wherein the electrolyte layer contains a sulfide solid electrolyte and a perfluoropolyether represented by formula (1) below:where Rf1 and Rf2 are each independently a C1-16 divalent alkylene group which may be substituted with one or more fluorine atoms, E1 and E2 are each independently a monovalent group selected from the group consisting of a fluorine group, a hydrogen group, a hydroxyl group, an aldehyde group, a carboxylic acid group, a C1-10 alkyl ester group, an amide group which may have one or more substituents, and an amino group which may have one or more substituents, and RF is a divalent fluoropolyether group.

The invention relates to the field of biomedical materials, and particularly provides injectable adhesive carboxylated chitosan / dialdehyde starch hemostatic hydrogel and application thereof.The hemostatic hydrogel is formed by carboxylated chitosan sol and dialdehyde starch size through Schiff base reaction, hydrogen bond construction and in-situ rapid crosslinking by means of a bidirectional pumping and injecting delivery strategy, and the hemostatic hydrogel is prepared through a two-way pumping and injecting delivery strategy, and the injectable adhesive carboxylated chitosan / dialdehyde starch hemostatic hydrogel is prepared from the carboxylated chitosan sol, the dialdehyde starch size and the injectable adhesive carboxylated chitosan / dialdehyde starch hemostatic hydrogel. The hydrogel has the advantages of good biocompatibility, injectability, adhesion, personalized adaptation and the like, integrates multiple hemostasis mechanisms, a physical barrier effect of rapid gelation, an expansion compression effect of water absorption swelling, an electrical neutralization effect of carboxylated chitosan amino and a tissue adhesion effect of dialdehyde starch aldehyde group, realizes multi-scene rapid and efficient hemostasis, and has a wide application prospect. The preparation method of the injectable adhesive hemostatic hydrogel is low in cost, innovative in technology, mild in condition, convenient to store and beneficial to large-scale batch production, and has a wide application prospect in the field of efficient hemostatic hydrogel.

The invention discloses an L-threonine aldolase mutant and application of the L-threonine aldolase mutant in synthesis of L-serine. The mutant is obtained by performing single mutation on the 88th amino acid of a wild type L-threonine aldolase amino acid sequence shown as SEQ ID No.2. The invention further discloses a preparation method of the L-threonine aldolase mutant. The invention provides the L-threonine aldolase mutant with better catalytic performance, aldol condensation reaction of formaldehyde and glycine can be efficiently catalyzed to prepare L-serine under the condition of not adding a tetrahydrofolic acid precursor, the yield of the L-serine is increased to 72.3% from 56.7% before mutation, the yield is remarkably increased, and the L-threonine aldolase mutant has the advantages that the L-threonine aldolase mutant has a good application prospect. Good application prospects are shown in the synthesis of the L-serine.

The invention belongs to the field of organic synthesis, and discloses an aldol condensation reaction method and a catalyst thereof.The method comprises the steps that in the presence of a composite catalyst, a substrate 1 and a substrate 2 are subjected to an aldol condensation reaction, after the reaction is finished, an aldol condensation product is collected from reaction products, according to the method, aldol condensation reaction of fatty aldehyde or aromatic aldehyde is catalyzed by adopting the novel composite catalyst, and the method has the advantages of being mild in reaction condition, environmentally friendly, efficient and simple in post-treatment.

The invention relates to the technical field of flame retardance, in particular to a flame retardant, a preparation method of the flame retardant and application of the flame retardant in preparation of flame-retardant epoxy resin. A trifunctional boron-containing amino compound and a bifunctional silicon-containing aldehyde compound react under mild conditions to generate a hyperbranched Schiff base structure compound, and then a phosphorus-containing compound containing a P-H bond and the hyperbranched Schiff base compound are subjected to an addition reaction to prepare the hyperbranched multi-element halogen-free flame retardant. The flame retardant prepared by the invention contains four flame-retardant elements such as phosphorus, nitrogen, boron and silicon, so that the synergistic flame-retardant effect among the flame-retardant elements is realized. Meanwhile, the terminal amino group of the hyperbranched structure can react with a functional group in a matrix material to form a cross-linked network structure, so that the compatibility of the flame retardant and the matrix material is improved, and the flame retardant efficiency and the mechanical property of the polymer can be remarkably improved. The flame retardant has the advantages of good flame retardant effect, easily available raw materials, mild reaction conditions and the like, and has wide application prospects.

The invention discloses modified cellulose nanofiber reinforced bi-crosslinking immunoregulation hydrogel as well as a preparation method and application thereof, and belongs to the technical field of biological materials and biomedical engineering. Oxidized sodium alginate and dopamine grafted gelatin are adopted to prepare a main body of the composite hydrogel, aldehyde groups on the oxidized sodium alginate and amino groups on the gelatin can form Schiff base bonds, and borax, the oxidized sodium alginate and vicinal diol structures on modified cellulose nanofibers can form boric acid ester bonds. The double-crosslinking structure enhances the mechanical property of the hydrogel. The borate bond and the Schiff base bond are both dynamic chemical bonds and can respond to pH change, so that the hydrogel is endowed with self-healing performance and pH-responsive drug release ability, the hydrogel can quickly release liposome with an anti-inflammatory function in an acidic inflammatory environment in the early stage of cartilage injury, and the hydrogel recovers to an original state after fracture caused by joint movement. And the overall stability of the hydrogel is ensured by the double-crosslinking structure.

The invention discloses a preparation method of 3-chloro-5, 5-dimethyl-4, 5-dihydroisoxazole, which comprises the following steps: taking a hydroxylamine oxygen sulfonic acid aqueous solution and isopentenal as raw materials, carrying out oximation reaction in an organic solvent under an alkaline condition, then directly adding an acid or an organic base catalyst into the reaction system, and reacting for 2-4 hours to obtain 3-chloro-5, 5-dimethyl-4, 5-dihydroisoxazole, thereby obtaining the 3-chloro-5, 5-dimethyl-4, 5-dihydroisoxazole. Under the catalytic action of the catalyst, a cyclization reaction is carried out, after the reaction is finished, an intermediate solution containing 5, 5-dimethyl-4, 5-dihydroisoxazole is obtained, and the next step is directly carried out; and carrying out a chlorination reaction by taking the intermediate solution as a raw material and sodium hypochloride or chlorine as a chlorination reagent, and after the reaction is finished, carrying out post-treatment to obtain the 3-chloro-5, 5-dimethyl-4, 5-dihydroisoxazole. The hydroxylamine oxygen sulfonic acid is used for enabling the isopentenal to be subjected to oximation reaction under the alkaline condition, then cyclization is carried out under the catalytic action of acid or alkali, the 5, 5-dimethyl-4, 5-dihydroisoxazole is generated, and the process has the advantages that the yield is high, the production steps are simplified, and the production cost is reduced.

The invention relates to the technical field of organic catalysis, in particular to a method for preparing glycolaldehyde by catalyzing formaldehyde hydroformylation. The method comprises the following steps: introducing CO and H2 into a mixed solution of paraformaldehyde, a rhodium compound, a ligand and a solvent, and reacting to prepare glycolaldehyde, the ligands comprise a ligand 1 and a ligand 2; the ligand 1 is selected from one or more of compounds as shown in the following L1-L8: # imgabs0 #; the structural formula of the ligand 1 is as shown in the specification, the structural formula of the ligand 2 is as shown in the specification, namely # imgabs1 # or # imgabs2 #, R1 is H, (CH2) ACH3, O-(CH2) ACH3, X or CX3, the value range of A is 0-3, and X is a halogen atom. According to the method disclosed by the invention, different ligands are subjected to dominant combination and cooperate with the rhodium-based catalyst, so that glycolaldehyde is obtained with high conversion rate and high selectivity under relatively mild conditions.

The invention discloses a phosphorus-nitrogen synergistic flame-retardant phenolic aldehyde curing agent as shown in a formula (I) and a preparation method thereof, and the preparation method of the compound comprises the following steps: under the condition of nitrogen, by taking water as a solvent, adding a basic catalyst, uniformly stirring, adding melamine and an aldehyde compound to carry out hydroxylation reaction, then adding a phosphorus-containing monomer to carry out dehydration condensation reaction, and obtaining the phosphorus-nitrogen synergistic flame-retardant phenolic aldehyde curing agent. And neutralizing the reacted material, adding a phenolic compound, heating for reaction, and then carrying out post-treatment to obtain the product. Furthermore, the resin composition for the copper-clad plate is formed by mixing the multifunctional epoxy resin, the phosphorus-nitrogen synergistic flame-retardant phenolic curing agent, the benzoxazine resin, the active ester curing agent, the accelerant, the filler and the solvent, and the prepared phosphorus-nitrogen synergistic flame-retardant copper-clad plate has excellent moisture absorption performance, dielectric property, heat resistance, flame retardance, toughness and the like; the method is suitable for the field of high-performance printed circuit boards. # imgabs0 #

The invention discloses a preparation method and application of a nitrogen-containing heterocyclic porous covalent organic framework material. The preparation method comprises the following steps: mixing trialdehyde phloroglucinol and a nitrogen heterocyclic ring-containing monomer according to a certain mass ratio, adding an organic catalyst and a mixed solvent, degassing, sealing, carrying out solvothermal reaction synthesis, washing with a polar solvent, carrying out Soxhlet extraction and purification, and drying to obtain the nitrogen heterocyclic ring-containing porous covalent organic framework material. According to the method, a pyridazine unit and trialdehyde phloroglucinol are used as monomers to construct a COF skeleton of a nitrogen heterocyclic ring, an asymmetric pi-conjugated structure is formed, efficient electron-hole space separation is achieved, active site charge distribution is optimized through the electron-rich characteristic of the pyridazine unit, and the oxygen molecule adsorption and activation capacity is enhanced. The method adopts a green solvent, is mild in reaction condition, avoids the use of toxic reagents, is green and environment-friendly, and provides a new way for photocatalytic synthesis of hydrogen peroxide.

The invention discloses chitosan-based self-degradable hydrogel with photo-thermal antibacterial, hemostatic and antioxidant functions as well as a preparation method and application of the chitosan-based self-degradable hydrogel, and belongs to the technical field of material synthesis and biological medicines. The hydrogel takes carboxymethyl chitosan as a matrix, amino on a molecular chain of the carboxymethyl chitosan and an aldehyde group of 4-formyl phenylboronic acid form an imide bond, and a boric acid group of the 4-formyl phenylboronic acid and a catechol group of tannic acid-iron form a borate bond; the coordination effect of tannic acid and iron ions further strengthens the dual covalent bond network structure and endows photo-thermal performance. According to the system, through multi-stage crosslinking of double dynamic covalent bonds (imide bonds and boric acid ester bonds) and hydrogen bonds, the functions of rapid hemostasis, active oxygen removal, photo-thermal antibiosis and self-degradation are achieved. The invention provides a multifunctional, safe and controllable novel dressing design scheme for wound healing treatment. The hydrogel is simple to prepare and can be widely applied to the field of biological medicines.

The invention discloses a polymer solid electrolyte based on a covalent organic framework, and a preparation method and application thereof. According to the method, firstly, PVDF-HFP and PEG1-NH2 are synthesized into a PH-PEG1-NH2 thin film, then a trialdehyde phloroglucinol solution is poured on the thin film to generate a PH-PEGCOF composite film, the composite film is impregnated with PEO and lithium salt to form a polymer electrolyte film, the polymer electrolyte film is applied to a solid-state lithium battery, and the assembled battery has good stable cycle performance.

The invention discloses a production system and method for preparing high-carbon aldehyde through carbonyl synthesis of high-carbon olefin. The system comprises a reaction device, a separation device, an aldehyde condensing device, a product tank, a polymer supplementing unit and a recycling unit, the polymer supplementing unit is connected with the separating device; the cyclic utilization unit comprises an extraction separation device connected with a liquid phase outlet of the separation device, a polymer recovery device connected with a water phase outlet of the extraction separation device, and a catalyst regeneration device connected with an organic phase outlet of the extraction separation device. According to the method, a carbonyl metal catalytic system is adopted to catalyze reaction of high-carbon olefin and synthesis gas, and heating separation of reaction liquid is performed by introducing an organic polymer protection catalyst; the separated catalyst liquid phase is subjected to water extraction separation and post-treatment, and the organic polymer and the catalyst are recycled. Recycling of the catalyst and efficient separation of the product are realized, and the stability of the catalyst separation section is enhanced.