5536 results about "Aldehyde" 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 discloses a polyrotaxane covalent organic framework material capable of regulating interlayer spacing through cyclodextrin and application of the polyrotaxane covalent organic framework material, and belongs to the technical field of biological medicine. The polyrotaalkylated covalent organic framework material is obtained by taking a cyclodextrin aromatic multi-amino inclusion compound and a (multi-aldehyde bipyridine) ruthenium (II) complex as structural units and carrying out copolymerization; the cyclodextrin aromatic polyamine inclusion compound is a beta-cyclodextrin p-phenylenediamine inclusion compound with a hydroxyl group or without a hydroxyl group; the (multi-aldehyde dipyridyl) ruthenium (II) complex is tris (4, 4 '-diformaldehyde-2, 2'-dipyridyl) ruthenium (II). The interlayer spacing of the polyrotaxane covalent organic framework material is greatly increased by utilizing a cavity of gamma-cyclodextrin, and meanwhile, the material has excellent photo-thermal and photodynamic activity, is positively charged, and can better adsorb negatively charged bacteria; and the hydrogel is good in biocompatibility and free of toxic and side effects, and has an excellent treatment effect on wounds infected with staphylococcus aureus.

The invention relates to the field of textile materials, and provides an antibacterial breathable yarn obtained by blended spinning of polyester fibers, polyamide fibers, cotton fibers and elastic fibers. The polyester fiber is prepared through melt blending and spinning processes and comprises polyethylene glycol terephthalate slices, modified chitosan zinc oxide, an antioxidant 1010, a POE elastomer, polyether modified silicone oil and polyethylene glycol 200, and the modified chitosan zinc oxide is prepared by compounding chitosan cinnamyl aldehyde Schiff base and silane modified zinc oxide. The chitosan cinnamyl aldehyde Schiff base is prepared through a Schiff base condensation reaction of chitosan and cinnamyl aldehyde, and the silane modified zinc oxide is prepared from nano rod-shaped zinc oxide particles modified by isocyanate propyl triethoxy silane. The yarn has excellent antibacterial property, air permeability and flexibility and is further used for knitting antibacterial breathable socks, the knitting density of the sock bottom part is reduced to enhance the air permeability, the knitting density of the sock opening part is improved to improve the elasticity and the fitting degree, and the yarn has wide application value.

The invention relates to a composite hydrogel dressing for promoting wound healing as well as preparation and application thereof, and belongs to the technical field of biological medicines. The hydrogel disclosed by the invention is prepared by mixing gelatin, oxidized dextran and metal ion modified metal-organic framework compounds (MOF-Ag and MOF-Cu). In the mixed solution, amino groups in the gelatin and aldehyde groups of the oxidized dextran are subjected to a Schiff base cross-linking reaction, and the composite hydrogel is formed after standing. The loaded MOF-Ag has antibacterial and anti-biofilm effects on staphylococcus aureus and escherichia coli, and the loaded MOF-Cu has similar superoxide dismutase activity and similar glutathione peroxidase activity, so that excessive active oxygen can be removed, and inflammatory response can be relieved. The obtained hydrogel has good biocompatibility, proper mechanical properties and biological adhesion, stable rheological properties, excellent antibacterial and anti-inflammatory functions and a certain hemostatic function.

The invention relates to a multi-section quench trickle bed reaction system and reaction method for liquid phase hydrogenation of aldehyde and ketone, the system comprises a multi-section quench liquid phase hydrogenation reactor filled with at least two sections of catalyst bed layers, a product circulating liquid inlet is arranged above each section of catalyst bed layer and is used for introducing a product circulating liquid into the corresponding catalyst bed layer; the adiabatic temperature rise of each section of the catalyst bed layer of the reactor is independently controlled by controlling the flow and the temperature of the circulating quenching liquid of each section of the catalyst bed layer; the method can effectively reduce the adiabatic temperature rise of the catalyst bed layer, prolong the service life of the catalyst, reduce the occurrence of side reactions, improve the product quality and yield, reduce the circulation volume of the liquid-phase product, and reduce the energy consumption. And a better hydrogenation effect can be realized by adopting a single trickle bed reactor, so that the equipment investment is reduced.

The invention discloses a deep eutectic solvent / bimetal organic framework co-catalyzed straw polyol as well as a preparation method and application thereof, the straw polyol is prepared by the following method: uniformly mixing straw powder, small molecular alcohol, an acid catalyst and a deep eutectic solvent in a nitrogen atmosphere, and reacting to obtain a reaction product; and adding a bimetal organic framework catalyst into the reaction product, and reacting to obtain the straw polyol. A green, natural and pollution-free eutectic solvent catalytic liquefaction technology is adopted, lignin and hemicellulose can be dissolved, the cross-linking effect between lignin and hemicellulose and cellulose is reduced, the crystalline structure of cellulose can be destroyed, the available surface area is increased, the contact with a liquefying agent is enhanced, the conversion efficiency is improved, and the residue rate is reduced; the bimetallic organic framework catalyst is added in the middle and later periods of the reaction, aldehydes, ketones and acid and ester substances can be reduced and upgraded into alcohols, the hydroxyl value of the liquefied polyol is greatly increased, and the film-forming crosslinking degree is improved.

The invention relates to a crown ether covalent organic framework material as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving a crown ether monomer and an amino monomer in an o-dichlorobenzene solvent, adding a catalyst acetic acid aqueous solution, and uniformly dispersing to form a reaction solution; the method comprises the following steps: freezing a reaction solution through a liquid nitrogen bath, vacuumizing, filling nitrogen, carrying out a heating reaction, and carrying out post-treatment operations such as washing and drying on a reaction product, so as to obtain the crown ether covalent organic framework material BADT-DB18C6-COF. The crown ether covalent organic framework material is formed by condensation of a crown ether aldehyde monomer and an amino monomer, the crown ether monomer is 4, 4 ', 4' ', 4 '''-(6, 7, 9, 10, 17, 18, 20, 21-octahydrodibenzo [B, K] [1, 4, 7, 10, 13, 16] hexaoxacyclo octadecene-2, 3, 13, 14-tetrayl) tetrabenzaldehyde, and the crown ether monomer is 4, 4 ', 4' ', 4'''-(6, 7, 9, 10, 17, 18, 20, 21-octahydrodibenzo [B, K] [1, 4, 7, 10, 13, 16] hexaoxacyclo octadecene-2, 3, 13, 14-tetrayl) tetrabenzaldehyde. The amino monomer is 4 ', 5'-bis (4-aminophenyl)-[1, 1 ': 2', 1 ''-terphenyl]-4, 4''-diamine. The crown ether covalent organic framework material BADT-DB18C6-COF prepared by the invention is mainly used as an adsorbent, is used for adsorbing and recovering uranium, thorium and americium ions from a solution, shows good adsorption capacity on radionuclides U-238, Th-232 and Am-243, and is particularly suitable for the field of spent fuel post-treatment in the nuclear industry.

The present invention provides a novel process for the production of aliphatic unsaturated C10-aldehyde compounds catalyzed by lipoxygenase (LOX) from a polyunsaturated fatty acid (PUFA) source. The invention also relates to the isolation and characterization of novel, preferably bifunctional LOXs from different algae sources, and the identification of structural and / or functional related LOXs from different bacterial sources. The invention also relates to the provision of enzyme mutants derived from said newly identified enzymes. Another aspect of the invention relates to the corresponding coding sequences of said enzymes, recombinant vectors and recombinant host cells, which are suitable for the production of such LOXs and for carrying out a new process for the production of aliphatic unsaturated C10-aldehyde compounds. Another aspect of the invention relates to the use of a specific aldehyde or aldehyde mixture obtained according to the invention as a flavoring ingredient or an ingredient of a food or feed composition.

The invention discloses lactobacillus plantarum for degrading low-molecular aldehyde substances, a composition thereof and application of the lactobacillus plantarum in duck liver fishy smell degradation, and is characterized in that the lactobacillus plantarum is an LPC01 strain, the preservation number is CGMCC No.32002, the addition amount of a lactobacillus plantarum suspension in duck liver paste is 0.5-1.5 vt%, and the addition amount of the lactobacillus plantarum suspension in the duck liver paste is 0.5-1.5 vt%. The invention further provides an application of the lactobacillus plantarum composition composed of the lactobacillus plantarum suspension and the saccharomycetes suspension in equal volume in duck liver fishy smell degradation, the saccharomycetes suspension is inoculated into the duck liver paste for fermentation, then the lactobacillus plantarum suspension is inoculated for fermentation, and the lactobacillus plantarum composition has the advantages that in the duck liver fermentation process, the total aldehyde degradation rate of the strain is 63.8%; and under the co-culture condition with saccharomycetes, the degradation rate is increased to 97.8%, and a remarkable deodorization effect is shown.

The invention provides an anti-aging flame-retardant epoxy resin coating and a preparation process thereof, and belongs to the technical field of coating preparation. The preparation process comprises the following steps: preparing the flame-retardant additive; preparing a coated modified black phosphorus nanosheet; preparing modified hollow glass beads; preparing the epoxy resin coating. The preparation method comprises the following steps: dissolving 3, 4-dihydroxy benzaldehyde and 2-amino-4-methylphenol in absolute ethyl alcohol, carrying out a heating reflux reaction, carrying out dehydration condensation on an aldehyde group in the 3, 4-dihydroxy benzaldehyde and an amino group in the 2-amino-4-methylphenol to generate an imine bond-containing intermediate, respectively dissolving the intermediate and phosphonitrilic chloride trimer, and carrying out a reaction to obtain the phosphonitrilic chloride trimer. The preparation method comprises the following steps: firstly, adding phosphonitrilic chloride into an intermediate, then mixing for reaction, enabling phenolic hydroxyl groups in the intermediate and phosphonitrilic chloride trimer to be subjected to nucleophilic substitution reaction to generate the flame-retardant additive containing phosphorus and a Schiff base structure, and the flame-retardant additive has relatively good compatibility with an epoxy resin matrix, is not easy to separate out and can effectively improve the flame-retardant property of the epoxy resin coating.

The invention belongs to the technical field of flame-retardant materials, and particularly relates to preparation of a phosphorus, nitrogen and silicon macromolecular flame retardant and application of the phosphorus, nitrogen and silicon macromolecular flame retardant in epoxy resin. The preparation method comprises the following steps: firstly, carrying out substitution reaction on chlorosilane and syringaldehyde or vanillic aldehyde to synthesize a silicon-containing intermediate, then carrying out Schiff base reaction on the silicon-containing intermediate and an amine compound, and finally carrying out addition reaction on the silicon-containing intermediate and a phosphorus-containing compound to prepare the phosphorus, nitrogen and silicon macromolecular flame retardant. The flame retardant has a good flame-retardant effect, can be used for preparing flame-retardant epoxy resin, can effectively improve the limit oxygen index and the vertical combustion grade of the epoxy resin, and can endow the epoxy resin with good transparency and molten drop resistance.

The invention discloses a rare-earth metal arylamine group compound as well as preparation method and application thereof. The invention discloses the rare-earth metal arylamine group compound which is characterized in that a general formula of the rare-earth metal arylamine group compound is (2,6-R12PhNH)5LnLi2(THF)2, wherein Ln is a rear-earth metal selected from one of neodymium, samarium, ytterbium or yttrium; R1 is selected from one of hydrogen, methyl or isopropyl. The rare-earth metal arylamine group compound has the advantages that the rare-earth metal arylamine group compound has a definite structure; raw materials used in the preparation method are simple, easily obtained and cheap; the reaction process is simple and easily operated; the rare-earth metal arylamine group compound product is conveniently purified and the yield of the product is high; the rare-earth metal arylamine group compound has a high activity when acting as a single component catalyst to catalyze a hydrogen phosphine reaction of aldehyde or ketone and phosphite ester; the use amount of the catalyst is less; the yield is high; a substrate has wide universality; a new and simple method is provided for synthesis of a-hydroxyphosphonate.

The invention relates to the field of coatings, and discloses an outer wall light radiation heat preservation and heat insulation decorative sheet and a preparation method thereof.A radiation refrigeration layer on the surface of the outer wall light radiation heat preservation and heat insulation decorative sheet comprises modified acrylate resin, silicon dioxide, ground calcium carbonate, talcum powder, modified hollow glass beads and auxiliaries; the modified acrylate resin is prepared by copolymerizing perfluorooctyl ethyl acrylate, methyl methacrylate, modified isocyano ethyl methacrylate and vinyltriethoxysilane, and the modified isocyano ethyl methacrylate is prepared by using salicylaldehyde and benzothiazole-2-formaldehyde as well as 1, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate as an initiator and using 2, 3, 4-trimethyl-1, 3-pentanediol monoisobutyrate as an initiator. The preparation method comprises the following steps: reacting amino groups at two ends of 1, 5-naphthylenediamine with DOPO, carrying out nucleophilic addition reaction with DOPO, and grafting with isocyano ethyl methacrylate. The modified hollow glass beads are prepared by using tetrabutyl titanate as a titanium source through a sol-gel method, and the prepared radiation refrigeration layer has the super-amphiphobic self-cleaning effect, the radiation refrigeration effect is good, and meanwhile the flame retardant property and the antibacterial effect are excellent.

The invention provides a gamma-cyclodextrin-based metal organic framework composite material as well as preparation and application thereof. The metal organic framework composite material based on gamma-cyclodextrin comprises chitosan, gamma-CD-MOFs (Metal Organic Frameworks) and an active substance. The preparation method comprises the following steps: by taking chitosan as a film material base material, synthesizing gamma-CD-MOFs by utilizing a hydrothermal method, and then loading cinnamyl aldehyde with antibacterial property, 2-methoxycinnamyl aldehyde with ultraviolet light resistance and curcumin with an antioxidant effect into the gamma-CD-MOFs. And finally, mixing with chitosan with better film-forming property, and spraying on glass or the surfaces of fresh fruits. The gamma-CD-MOFs has the characteristic of slowly releasing bioactive substances, is non-toxic and is a material capable of being applied to food packaging.

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 discloses a self-healing injectable photo-crosslinking dual-network hydrogel and a preparation method thereof.The preparation method comprises the steps that silk fibroin is subjected to methacrylation modification through a glycidyl methacrylate solution, then dextran of the silk fibroin is subjected to an oxidation reaction through a sodium periodate solution, oxidized dextran is generated, and the self-healing injectable photo-crosslinking dual-network hydrogel is obtained; the amino group in the modified silk fibroin and the aldehyde group of the oxidized dextran are subjected to a Schiff base cross-linking reaction to form the double-network hydrogel. The hydrogel with the double-network structure prepared by the invention is more compact in structure, so that the hydrogel has a series of excellent performances such as injectability, relatively good adhesion, good mechanical property, self-healing property and slow release property after drug loading while having safety.

A full-bio-based flame-retardant material and a preparation method therefor. The composition of the full-bio-based flame-retardant material comprises a hexaldehyde bio-based phosphazene monomer, and a castor oil polyamine and / or a furyl diamine, wherein the molar ratio of the total amino groups in the castor oil polyamine and furyl diamine to the aldehyde groups in the hexaldehyde bio-based phosphazene monomer is 1 : (0.8-1.2). The full-bio-based flame-retardant material is a full-bio-based material, and the mechanical and the flame-retardant properties thereof can be adjusted and controlled by adjusting the content of the castor oil polyamine and furyl diamine to adapt to the different requirements of different products for the flame-retardant material. Moreover, the full-bio-based flame-retardant material further has self-repairing, reprocessing and degradability properties.

The invention provides nutritional moisturizing ceramsite as well as a preparation method, application and an application method.The method comprises the following steps: firstly, uniformly mixing sieved power plant fly ash with commercial cement, solid nutrition powder and coal gangue powder, and adding hydrogen peroxide to obtain porous ceramsite; the preparation method comprises the following steps: adsorbing a nutritional agent by porous ceramsite, wrapping the porous ceramsite with phosphorylated chitosan, carrying out hydroformylation and alkynylation, and reacting with the modified microcapsule to obtain the nutritional moisturizing ceramsite. The invention also provides an application of the nutritional moisturizing ceramsite in desertification soil improvement. According to the application method of the nutritional moisturizing ceramsite in desertification soil improvement, the nutritional moisturizing ceramsite is divided into large, medium and small ceramsite according to the particle size, and directly covers a desertification land to form a nutritional moisturizing ceramsite layer in a big-end-up form, a uniform form, an interlayer form, a mixed form or a uniform mixing form. The nutritional moisturizing ceramsite prepared by the invention can improve soil fertility and promote plant growth.

The invention belongs to the technical field of membrane separation, and aims to provide a preparation method and application of a covalent organic framework bipolar membrane. The method comprises the following steps: combining at least one amine, hydrazide or aldehyde monomer containing ionic groups with a monomer without ionic groups, and respectively synthesizing covalent organic framework COF nanosheets with positive charges and negative charges through a one-pot method under the condition of coexistence of an acid catalyst and an organic solvent; sequentially depositing COF nanosheets with positive and negative charges on the surface of the porous carrier by a hot solvent evaporation method; by constructing two COF separation layers with regular pore channels and opposite electrical properties, the covalent organic framework bipolar membrane with charge asymmetry is finally obtained. The product provided by the invention has high selectivity, can realize efficient separation of protons and metal cations, and significantly improves the extraction and recovery purity of hydrochloric acid; through charge repulsion and pore size screening mechanisms, separation of different anions can be further realized, and selective recovery of acid molecules is enhanced.

The invention relates to the field of film materials, and discloses a degradable antibacterial film material and a preparation method thereof.The film material comprises degradable matrix resin, a modified additive, a plasticizer and a lubricant; the modified additive is prepared by loading a natural antibacterial agent on a modified flame-retardant composite filler; the modified flame-retardant composite filler is prepared by reacting cinnamyl aldehyde with a flame-retardant composite filler and forming a complex with zinc acetate dihydrate; the flame-retardant composite filler is prepared by reacting epoxidized composite filler with 1, 5-naphthalene diamine and then further reacting with phytic acid; according to the invention, the natural antibacterial agent is loaded in the modified flame-retardant composite filler through a vacuum impregnation method, and the mechanical property, antibacterial property and flame-retardant property of the material are enhanced by adding the modifying additive, so that the flame-retardant and antibacterial composite material has the advantages that the flame-retardant and antibacterial properties of the material are improved, and the service life of the material is prolonged. Meanwhile, diffusion / permeation of gas and water molecules in the film is adjusted.

The invention discloses a preparation method and application of a chiral aldehyde amine condensation covalent organic framework material, through an ultrasonic chemical synthesis method, the synthesis cost and energy consumption are remarkably reduced, the reaction time is shortened, and the chiral transmission efficiency and the crystallinity of the material are greatly improved; the synthesis method disclosed by the invention not only has the characteristics of high efficiency and environmental protection, but also provides a brand new technical means for preparing a high-performance chiral two-dimensional COF material with a controllable structure; according to the preparation method, the preparation of the chiral two-dimensional COF material is more efficient and stable, and the chiral two-dimensional COF material has high repeatability and controllability, is suitable for being widely applied to various technical fields needing high-chiral materials, and further promotes the development of the chiral materials in scientific research and industrial application.

The invention discloses a low-temperature self-repairing polysiloxane material based on coordinate bonds and a preparation method and application thereof, and belongs to the field of novel materials.The low-temperature self-repairing polysiloxane material is prepared through the steps that amino of bis (3-aminopropyl)-terminated poly (dimethyl siloxane) and aldehyde group of an aldehyde group small molecule compound are subjected to a Schiff base condensation reaction, and a prepolymer is obtained; and adding metal ions into the prepolymer to carry out a coordination reaction to form a reversible metal coordination bond, and removing the solvent after the reaction is finished to obtain the low-temperature self-repairing polysiloxane material based on the coordination bond. The formed three-dimensional structure contains a large number of reversible metal coordination bonds, so that the rigidity and the mechanical strength of the material are enhanced, and meanwhile, the good self-repairing performance and the machinable recoverability of the material are ensured. The coordination bond-containing self-repairing polysiloxane material can be applied to the fields of adhesives, sealants, rapid self-repairing coatings, composite materials and the like.

The invention relates to a covalent organic framework / melamine-based sponge composite material as well as a preparation method and application thereof. The covalent organic framework / melamine-based sponge composite material comprises melamine sponge and a covalent organic framework material, the covalent organic framework material is prepared by reacting an amino monomer with an aldehyde group monomer; the aldehyde group monomer is an aldehyde group monomer containing hydroxyl. The composite material based on the covalent organic framework / melamine sponge combines the excellent hydrophobicity of the covalent organic framework and the high porosity of the melamine sponge, so that the composite material has extremely high adsorption capacity on oil, repels moisture, has an excellent oil-water separation effect and can realize efficient oil-water separation.

The application discloses a method for selectively preparing furan amine or tetrahydrofuran amine from furan aldehyde substances, which comprises the following steps: in an aqueous solution with the volume percentage concentration of ammonia water being greater than 70%, furan aldehyde substances are subjected to a reductive amination reaction in the presence of H2 and under the action of a catalyst to prepare furan amine; and in an aqueous solution with the volume percentage concentration of ammonia water being less than 20%, furan aldehyde substances are subjected to a reductive amination reaction in the presence of H2 and under the action of a catalyst to prepare tetrahydrofuran amine. The method can realize the selectivity of products by changing the addition amount of ammonia water in the aqueous solution, and is simple, easy to control, and suitable for industrial production and market promotion and application.

The invention belongs to the technical field of medicines, cosmetics and scalp care, and particularly relates to application of coniferaldehydes and derivatives or salts of the coniferaldehydes to preparation of medicines and cosmetics for promoting hair regeneration and treating chemotherapy-induced alopecia (CIA, CIA) and other types of alopecia, in particular to application of the coniferaldehydes and the derivatives or salts of the coniferaldehydes to preparation of the medicines and the cosmetics. Experimental results show that coniferyl aldehyde can promote hair regeneration of mice, accelerate hair growth of the mice and effectively relieve alopecia symptoms of the mice after chemotherapy, and the effect of coniferyl aldehyde is better than that of minoxidil. According to the application, coniferyl aldehyde or a composition thereof is given to a subject, so that the vigor of hair follicles is remarkably enhanced, the stationary period of the hair follicles is shortened, and the hair loss process is inhibited. The coniferyl aldehyde provided by the invention has the industrial application advantages of reliable biological safety, controllable preparation cost and high raw material accessibility, can be obtained by a plant extraction or chemical synthesis method, is suitable for an external solution, gel or a scalp care preparation, and provides a natural, safe and effective solution for alopecia patients.

The invention discloses a zinc-bromine flow battery multifunctional negative electrode electrolyte and a preparation method thereof, and belongs to the technical field of electrochemical energy storage, and the method comprises the following steps: uniformly stirring and mixing a solvent, deionized water and a cosolvent, adding an electrolyte, stirring until the electrolyte is completely dissolved, then adding a supporting electrolyte and a negative electrode additive, stirring until the supporting electrolyte and the negative electrode additive are completely dissolved, and obtaining the zinc-bromine flow battery multifunctional negative electrode electrolyte. The multifunctional negative electrode electrolyte of the zinc-bromine flow battery is obtained; the negative electrode cosolvent is dimethylformamide; and the negative electrode additive is at least one of saponin and cinnamyl aldehyde. Saponin molecules are adsorbed on the surface of the zinc electrode, and electronegative carboxyl groups of the saponin molecules form an electrostatic repulsion net in an electric double layer, so that zinc ions are forced to be uniformly dispersed, local ion concentration hot spots are eliminated, and dendritic crystal nucleation is inhibited from the source. In cinnamyl aldehyde, the strong electronegativity of oxygen atoms and the electronegativity of aldehyde oxygen are far higher than those of hydrogen, so that electrons are strongly attracted, adjacent carbon atoms are positively charged, polar adsorption sites are formed, the hydrogen evolution reaction is effectively inhibited, and the stability and the cycle life of the battery are greatly improved.

The invention relates to the field of drain pipes, and discloses an antibacterial polypropylene noise-reduction drain pipe and a preparation method thereof, the antibacterial polypropylene noise-reduction drain pipe comprises polypropylene, modified glass fiber, an antibacterial additive, a compatilizer and a stabilizer; the modified glass fiber is prepared by performing formylation modification on glass fiber by using 3-aminopropyltriethoxysilane and glutaraldehyde, grafting triethylene tetramine and DOPO into a glass fiber structure, and then grafting a hindered phenol antioxidant; the antibacterial additive is prepared by compounding chitosan Schiff base and modified nano titanium dioxide, the chitosan Schiff base is prepared by utilizing a Schiff base reaction between chitosan and vanillin, and the modified nano titanium dioxide is prepared by utilizing isocyanate propyl triethoxy silane and ethyl glycolate to modify nano titanium dioxide. By adding the modified glass fiber and the antibacterial additive, the pipe is endowed with excellent heat resistance, aging resistance, flame retardance and antibacterial performance.

The invention discloses lactobacillus plantarum for aroma enhancement and quality improvement of fermented sour bamboo shoots and application of the lactobacillus plantarum SS0831, and particularly relates to lactobacillus plantarum SS0831 which is separated from naturally fermented sour bamboo shoots and is preserved in China Center for Type Culture Collection on December 23, 2024, the preservation address is Wuhan University, Wuhan, China, and the preservation number is CCTCC NO: M20242877. The lactobacillus plantarum is used for preparing the fermented sour bamboo shoots, the content of volatile aroma components such as esters, alcohols and aldehydes in the fermented sour bamboo shoots is effectively increased, the flavor quality of the sour bamboo shoots is improved, and more pleasant sensory experience is provided for people.

The invention discloses a covalent organic framework membrane and a preparation method thereof, and belongs to the technical field of organic porous materials and membrane materials. The preparation method of the covalent organic framework membrane comprises the following steps: S1, respectively dissolving an amine compound containing a plurality of amino groups and a compound containing a plurality of aldehyde groups in a mixed solution of trifluoroacetic acid and water to respectively obtain a first monomer solution and a second monomer solution; in the mixed solution, the volume ratio of trifluoroacetic acid to water is (95-96): (4-5); s2, mixing the first monomer solution and the second monomer solution, and performing ultrasonic treatment to obtain a reaction solution; and heating the reaction liquid at 95-100 DEG C to react for 3-5 minutes to form the covalent organic framework film. In addition, the invention also provides the covalent organic framework film which is prepared by the preparation method. The COF film which is complete in structure, excellent in crystallinity and flexible can be prepared in a short time through a simple method.

The invention discloses pH-responsive nanocellulose hydrogel and a preparation method and application thereof, and belongs to the technical field of hydrogel materials.The preparation method of the hydrogel comprises the following steps that firstly, an aldehyde cellulose nanofiber suspension and a carboxymethyl chitosan solution are mixed and stirred for 1-12 h at the temperature of 25-90 DEG C, and the molar ratio of amino to aldehyde is 1: 5-5: 1; 2, tannic acid and curcumin conjugated chitosan are added into the mixed solution of the aldehyde cellulose nanofibers and the carboxymethyl chitosan, the concentration of the tannic acid is 1-10 mg / mL, the concentration of the curcumin conjugated chitosan is 0.5-5 mg / mL, mixing and stirring are conducted, a cross-linking reaction is conducted, and the pH-responsive nanocellulose hydrogel is obtained. Based on the Schiff base bond effect in the hydrogel, the hydrogel has remarkable pH responsiveness, and by means of the hydrogen bond combination effect and synergistic effect among tannic acid, curcumin and nanocellulose, the hydrogel has good mechanical performance and antibacterial performance.