367 results about "Ethylene imine" patented technology

The invention discloses a high-performance green and environment-friendly single-component polymer cement waterproof dry blend and a preparation method thereof, and relates to the technical field of building materials, the high-performance green and environment-friendly single-component polymer cement waterproof dry blend comprises the following components: an inorganic cementing material, latex powder, graded quartz sand, a functional filler, cellulose ether, an organic silicon defoamer, a polycarboxylic acid water reducer and compound fibers; the functional filler is modified waste glass powder prepared through mechanical activation and silanization modification; the compound fiber is a mixture of modified glass fiber and modified polypropylene fiber; the preparation of the modified glass fiber comprises tannic acid and polyethyleneimine combined modification and graphene oxide modification, and the preparation of the modified polypropylene fiber comprises plasma activation. The polymer cement waterproof dry blend prepared by the method adopts the glass powder to replace natural mineral filler, is energy-saving and environment-friendly, and the cement matrix is modified by various fibers, so that the prepared polymer cement dry blend is excellent in comprehensive performance.

The invention provides a pharmaceutical wastewater treatment process. The pharmaceutical wastewater treatment process comprises the following steps: A1, pretreatment, A2, adsorption treatment, A3, oxidation treatment and A4, filtration treatment. In the step A2, a composite adsorbent comprising the following raw materials: attapulgite, activated carbon, carbon nanotubes, 4-carboxyphenylboronic acid, polyethyleneimine, sodium dithiocarbamate, epoxy resin E-44, deionized water and modified nano zero-valent iron is used, and self-repairing is realized through dynamic chemical bonds such as boric acid ester bonds, imine bonds and thiol-disulfide bonds; the adsorbent can be self-repaired during microscopic damage, so that the service life is prolonged, and relatively high adsorption capacity is kept. In the step A3, a gel microsphere oxidant comprising the following raw materials: hydrogen peroxide, potassium persulfate, copper-iron sulfide, nitrogen-doped carbon quantum dots, sodium alginate powder, sodium polyacrylate and a phosphate buffer solution is used, and efficient degradation is realized through a synergistic mechanism of free radical oxidation, non-free radical oxidation and photocatalysis.

The present invention discloses a high thermal conductivity rubber material and a preparation method thereof, and relates to the technical field of rubber production, the high thermal conductivity rubber material comprises a rubber matrix, modified carbon black, a vulcanizing agent, a composite accelerator, an anti-aging agent, zinc oxide, stearic acid, white carbon black, montmorillonite and aramid pulp according to a weight ratio of 100: (40-60): (1.5-3): (2-4): (1-3): (3-8): (1-3): (10-20): (5-15): (3-8); the modified carbon black is prepared by reacting a composite modifier solution prepared from a silane coupling agent, sodium alginate, ammonium polyacrylate, tea polyphenol, polyethyleneimine, nano aluminum oxide and deionized water with carbon black; the composite accelerant is prepared by carrying out pre-dispersion treatment on N-cyclohexyl-2-benzothiazole sulfenamide, tetramethylthiuram disulfide, a rare earth complex and nano zinc oxide. The prepared high-thermal-conductivity rubber material is good in mechanical property and thermal conductivity.

The invention provides catalyst slurry and a preparation method thereof, a membrane electrode and an electrolytic bath, and belongs to the technical field of water electrolysis hydrogen production, and the catalyst slurry comprises a catalyst, proton exchange resin, a dispersing agent and a solvent. Wherein the dispersing agent comprises at least one of polyvinylpyrrolidone, polyvinyl alcohol, polyethyleneimine, hexadecyl trimethyl ammonium bromide and hydroxyethyl cellulose. According to the catalyst slurry provided by the embodiment of the invention, sedimentation can be slowed down, the stability of the catalyst slurry is improved, the uniformity of the loading capacity of a catalyst in different membrane electrodes prepared from single-batch catalyst slurry is ensured, and the stability is improved.

The invention relates to a monovalent ion selective cation exchange membrane and a preparation method and application thereof, and the preparation method comprises the following steps: mixing polyethyleneimine and a cross-linking agent to obtain a pre-polymerized solution; coating the surface of a cationic base membrane with the pre-polymerized solution, and then heating to carry out a cross-linking reaction, so as to obtain a base membrane after surface cross-linking; and soaking the base membrane subjected to surface crosslinking in an oil phase solution of acyl chloride monomers, and carrying out interfacial polymerization reaction to obtain the monovalent ion selective cation exchange membrane. Through the synergistic effect of a three-dimensional network structure constructed through cross-linking reaction and a selective separation layer constructed through interfacial polymerization, the Li < + > / Mg < 2 + > separation coefficient can be increased, and long-acting and stable operation is achieved.

The invention belongs to the technical field of oilfield chemistry, and particularly relates to application of a hyperbranched zwitterionic polymer in high-temperature and high-salinity drilling fluid. The hyperbranched zwitterionic polymer is prepared by carrying out Michael addition reaction on polyethyleneimine and a monomer which is neutralized by alkali and contains double bonds and sulfonic acid groups; the polymer has a hyperbranched structure, and the amphoteric ion characteristic that an amino group from polyethyleneimine on a molecular chain and a sulfonic acid group from a monomer form an inner salt structure; the hyperbranched zwitterionic polymer is used as an inhibitor and a viscosity reducer of the drilling fluid. According to the hyperbranched zwitterionic polymer provided by the invention, the salt tolerance and high-temperature stability of the polymer are enhanced by introducing a sulfonate group; the polymer is endowed with low viscosity and high adsorption capacity through a hyperbranched structure, the viscosity of the drilling fluid can be effectively reduced, and clay hydration is inhibited; clay particles are stabilized through electrostatic interaction by zwitterionic characteristics, and the rheological property of the drilling fluid is optimized.

The invention belongs to the technical field of coke oven gas purification treatment, and particularly discloses a method for removing hydrogen sulfide in coke oven gas through photocatalysis, generation of oxygen vacancies is promoted by adopting a synthesis concept of synergistic effect of silver doping and polyethyleneimine, polyethyleneimine provides an alkaline condition on one hand, lone electron pairs on nitrogen are coordinated with zinc on the other hand, and the hydrogen sulfide in the coke oven gas is removed through photocatalysis. The preparation method comprises the following steps: by taking H2S and polyethyleneimine as raw materials, generating abundant oxygen vacancies under the synergistic effect of the H2S and silver, preventing agglomeration of generated ZnO and increasing reaction sites by taking polyethyleneimine as a surfactant, and then promoting a cascade reaction between ZnO < 1-x > and H2S by taking abundant oxygen vacancies, so that a 1D / 3D-ZnS / ZnO heterojunction is generated in situ to further reduce recombination of photo-generated electron holes; the catalyst converts H2S into elemental sulfur through photo-induced electrons and holes, and a carbon disulfide solution is used for cleaning the catalyst to realize regeneration of the catalyst. The method provided by the invention not only improves the removal efficiency of H2S, but also reduces the operation cost and reduces environmental pollution.

The invention discloses a polyphenol modified carbon fiber reinforced sulfonated polyetheretherketone composite material and a preparation method thereof, and belongs to the field of polymer composites.The preparation method comprises the steps that a resin matrix and filler are filled into a mold to be sintered, the resin matrix is sulfonated polyetheretherketone, the filler comprises modified carbon fibers and nano-silicon dioxide, and the modified carbon fibers and the nano-silicon dioxide are sintered to obtain the polyphenol modified carbon fiber reinforced sulfonated polyetheretherketone composite material; the modified carbon fiber is prepared by taking carbon fiber, catechol and polyethyleneimine as raw materials in a Tris buffer solution. The hydration lubrication performance of a resin matrix is improved through sulfonated polyetheretherketone, the hydrophilic property is enhanced, a polyphenol coating is formed through self-polymerization reaction on the surfaces of the carbon fibers, the adhesion performance of the surfaces of the fibers is improved through the pi-pi stacking effect, and the interface bonding force between the carbon fibers and the modified resin matrix is enhanced; the nano silicon dioxide is introduced to modify the matrix of the composite material, so that not only is the overall wettability of the material optimized, but also the mechanical property and the wear resistance are effectively improved, and the final composite material has the characteristics of high strength and low friction.

The application relates to a modified PA56 fabric with long-acting flame-retardant effect and a preparation method thereof, wherein hyperbranched polyethylene imine and ammonium polyphosphate are grafted to obtain hyperbranched modified ammonium polyphosphate, the PA56 fabric is dipped in a hyperbranched modified ammonium polyphosphate solution and dried and solidified, dipped in a melamine flame-retardant finishing agent, then dipped in an acetic acid buffer solution, and dried to obtain the modified PA56 fabric with long-acting flame-retardant effect. Different from the prior art, the hyperbranched modified ammonium polyphosphate is loaded on the PA56 fabric to form a crosslinked network structure; the polyethylene imine is loaded on the PA56 fabric; the ammonium polyphosphate is connected with the polyethylene imine through grafting modification; the melamine is connected with the ammonium polyphosphate through weak bonds such as electrostatic interaction, hydrogen bond and P-N bond, and is wrapped in the outer layer of the fabric, so that the durable flame-retardant effect of the modified PA56 fabric is realized, and the strength of the modified PA fabric is improved.

The invention discloses a polyurethane / cellulose acetate composite fiber membrane, a preparation method and application, and belongs to the technical field of fiber membranes, the surface of the polyurethane / cellulose acetate composite fiber membrane is grafted with a polyethyleneimine chain segment; the raw materials for surface grafting comprise a polyurethane / cellulose acetate composite fiber membrane, polyethyleneimine and dopamine hydrochloride in a mass ratio of 1: (20-30): (0.4-0.8). The polyurethane / cellulose acetate composite fiber membrane has a bicontinuous structure and is high in mass transfer efficiency, and a regular fiber structure and a relatively high specific surface area provide a good physical basis for subsequent grafting of polyethyleneimine chain segments. The dopamine hydrochloride can be self-polymerized on the surface of the composite fiber membrane to form polydopamine, so that the surface activity and the adhesive force of the composite fiber membrane are enhanced, the grafting rate of polyethyleneimine is improved, and the polyethyleneimine can remarkably improve the adsorption capacity of the composite fiber membrane on heavy metal ions through coordination, ion exchange and physical adsorption.

The invention discloses a fiber composite material based on hydrogen bond self-repairing and conductive self-diagnosis and a preparation method of the fiber composite material, and belongs to the technical field of intelligent diagnosis and self-repairing fiber reinforced resin-based composite materials and preparation of the intelligent diagnosis and self-repairing fiber reinforced resin-based composite materials. According to the method, the problem that the self-healing effect cannot be timely obtained on the internal damage of the material due to the fact that the damage area cannot be accurately positioned and identified before the damage of the existing fiber composite material is repaired is solved. According to the invention, a quantum tunnel effect and a three-dimensional conductive skeleton are constructed by using a micro-nano multi-stage conductive filler composed of a nano carbon nanotube, micron flake graphite powder and unidirectional short carbon fiber, a damage occurrence position is realized based on an electro-mechanical corresponding relation, a self-sensing function is given, and accurate positioning of the damage is realized (the error is less than 1mm). A multiple reversible hydrogen bond system formed by acrylamide, polyethyleneimine and epoxy resin is further utilized, the self-repairing effect of the composite fiber material is achieved, and the test result shows that the self-repairing efficiency of at least 90% or above is achieved at the normal temperature.

The invention belongs to the technical field of artificial veneers, and particularly relates to a fragrance-releasing blue-light-resistant microcapsule and a preparation method thereof, impregnated bond paper of the fragrance-releasing blue-light-resistant microcapsule, a fragrance-releasing blue-light-resistant ecological board and a preparation method of the fragrance-releasing blue-light-resistant ecological board. The technology aims at solving the problems of indoor blue light harm and air quality, and the problems that in the prior art, stable coexistence of a fragrance releasing component and an anti-blue-light component is difficult, and the technology is not compatible. The core is to prepare a multifunctional microcapsule through a unique interfacial polymerization and Schiff base in-situ reaction synchronous process: compound plant essential oil is taken as a core material, a vanillin-polyethyleneimine Schiff base conjugated structure is generated in situ in a wall material, and nanoparticles are cross-linked and fixed, so that a polyurethane / polyurea wall material is formed. The microcapsule is added into an adhesive layer of impregnated bond paper, and then is compounded with a base material through hot pressing to prepare the ecological board. The fragrance releasing and blue light resisting functions are successfully integrated on the board body, the effects that the blue light absorptivity at the wave band of 400-450 nm is larger than or equal to 70%, the formaldehyde release amount is smaller than or equal to 0.025 mg / m, and the fragrance is lasting are achieved, and the technology is highly compatible with an existing production line.

Disclosed herein is an aqueous cathodically depositable electrodeposition coating material composition including at least one binder dispersion (I) including at least one cathodically depositable polymer (a) and at least one pigment paste (II) including at least one pigment and / or filler, where manufacture of the electrodeposition coating material composition includes mixing the binder dispersion (I) and the pigment paste (II), and where the composition also includes at least one alkoxylated polyethyleneimine (b) and where at least one alkoxylated polyethyleneimine (b) is part of the at least one binder dispersion (I) and / or part of the at least one pigment paste (II).

The invention relates to the technical field of scale inhibitors, in particular to a slow-release micro-nano reverse osmosis scale inhibitor and a synthesis process thereof. The corrosion inhibitor comprises amino trimethylene phosphonic acid, polyol phosphonate, acrylic polyol, a poly gamma-glutamic acid-polyethyleneimine grafted copolymer, 1-hydroxyethylidene-1, 1-diphosphonic acid, polyacrylamide and diatomite. A plurality of raw materials are compounded, diatomite is used as a slow-release carrier, a poly-gamma-glutamic acid-polyethyleneimine grafted copolymer is utilized to realize slow release of a medicament, and a bioactive group is grafted on the surface of amino trimethylene phosphonic acid through microbial induced synthesis, so that the bioactivity of the medicament is improved. The problem that in the prior art, a nano-loaded agent is prone to agglomeration under the high pH condition is solved, the binding site and acting force of amino trimethylene phosphonic acid and other components are increased, the adhesiveness of the scale inhibitor to the membrane surface is improved, the long-acting scale inhibition effect under complex water quality is enhanced, and the scale inhibitor has a good application prospect. Therefore, the application efficiency of the reverse osmosis scale inhibitor in actual complex water quality is improved.

The invention discloses polyethyleneimine and epoxy compound modified sepiolite, the chemical structural formula of the modified sepiolite is shown in the specification, the sepiolite is subjected to chemical grafting loading with epoxy and polyethyleneimine on the surface through a silane coupling agent respectively, and the polyethyleneimine and epoxy compound modified sepiolite is obtained. The amino group on the sepiolite (PSEP) loaded with the polyethyleneimine and the epoxy group on the sepiolite (ESEP) loaded with the epoxy can be subjected to chemical reaction. When the sepiolite is randomly distributed, the PSEP and the ESEP are subjected to curing reaction at a lap joint contact point to form covalent binding, so that the sepiolite is converted into an interconnected continuous network structure. By means of composite modification, the specific surface area of sepiolite is increased, and dispersity, stability and compatibility are improved; and the continuous network can better exert the reinforcing effect of the sepiolite on the strength and the toughness.

The invention discloses a sodium ion battery electrolyte and a sodium ion battery, the preparation raw materials of the electrolyte comprise an electrolyte, an organic solvent and a composite additive, the preparation raw materials of the electrolyte comprise a sodium salt and modified graphite, the preparation raw materials of the modified graphite comprise graphite, dopamine hydrochloride, polyethyleneimine, Sb2O3 and BiCl3, the composite additive is prepared from trimethylsilyl trifluoromethanesulfonate, N-methyl pyrrolidone, vinylene carbonate and nano silicon dioxide. Through synergistic compounding, a high-stability three-dimensional ionic conduction network is constructed, so that the electrolyte has a wide electrochemical window and high ionic conductivity.

The invention belongs to the technical field of adsorbents, and discloses a core-shell structure composite material as well as a preparation method and application thereof. Ferroferric oxide is loaded on biochar by coprecipitation of ferric salt, ferrous salt and biochar, amination modification is performed by using polyethyleneimine, and a COF shell layer is prepared in situ by using a magnetic core. The shell layer is chemically connected with the magnetic core, and is coated by the COF shell, so that the structural stability is improved, the porous structure of the biochar is not easy to collapse, and the magnetic particles are not easy to fall off; the shell contains sulfonic acid groups, has electronegativity, and is combined with metal ions through electrostatic interaction, so that the adsorption sites of the adsorbent are increased. Meanwhile, the COF shell is of a porous structure, the specific surface area is large, the COF shell has the adsorption effect on metal ions, more adsorption sites are provided for the metal ions through the multiple adsorption effects of the COF shell and the magnetic core, and the removal rate is effectively increased.

The invention discloses a water treatment filtering material and a preparation method thereof, and relates to the technical field of water treatment. When the water treatment filtering material is prepared, polyacrylonitrile reacts with sodium azide to prepare graft modified polyacrylonitrile; alkali lignin is subjected to chloroethylation, and chlorinated modified lignin is prepared; the preparation method comprises the following steps: hydrolyzing tetrabutyl titanate, doping nickel and iron elements, and growing on a graphene nanosheet in situ to prepare modified titanium dioxide loaded graphene; modifying the graphene loaded with the modified titanium dioxide by using a silane coupling agent to prepare modified graphene; reacting the casting membrane base solution with the modified graphene and potassium carbonate to prepare a casting membrane solution A; reacting the membrane casting base solution with chlorinated modified lignin and polyethyleneimine to prepare a membrane casting solution B; and mixing the membrane casting solution A and the membrane casting solution B, and scraping into a membrane to prepare the water treatment filtering material. The water treatment filtering material prepared by the invention has the advantages of hydrophilicity, oil stain resistance, self-cleaning property, antibacterial property and good filtering property.

The invention belongs to the technical field of friction power generation, and particularly relates to a microcrystalline cellulose triboelectric composite film, a preparation method thereof and a triboelectric nano-generator. Comprising the following steps: adding soluble trivalent iron salt into microcrystalline cellulose dispersion liquid, uniformly dispersing, and adding polyethyleneimine in a stirring state to form a dispersion system; adjusting the pH value of the dispersion system, adding a cross-linking agent for activation to obtain a mixture, carrying out a cross-linking reaction to cross-link microcrystalline cellulose and a liquid amine derivative, complexing with ferric ions to obtain a composite film precursor, and drying the composite film precursor to obtain the microcrystalline cellulose triboelectric composite film. According to the invention, microcrystalline cellulose is taken as a matrix, polyethyleneimine and microcrystalline cellulose are crosslinked and complexed with Fe < 3 + >, and a recyclable, biodegradable and biocompatible composite film is constructed, so that the triboelectricity output and humidity adaptability of the cellulose-based triboelectricity material are improved, and the energy efficiency of the material in a self-powered process in a high-humidity environment is enhanced.

The invention discloses a preparation method and application of a composite phase change material functional current collector, and relates to the technical field of functional current collectors. The composite phase change material obtained by compounding polyethylene glycol, graphene oxide, hydroxypropyl methyl cellulose and polyethyleneimine is roller-coated on the surface of the current collector, and is applied to a battery material to realize thermal management at high and low temperatures; the preparation method comprises the following specific steps: mixing and heating graphene oxide and polyethyleneimine to obtain polyethyleneimine modified graphene oxide, heating and melting polyethylene glycol, adding hydroxypropyl methyl cellulose, stirring, adding the polyethyleneimine modified graphene oxide, and continuously stirring to obtain the composite phase change material.

The invention discloses functionalized magnetic cellulose aerogel as well as a preparation method and application thereof, and belongs to the technical field of aerogel materials. The functionalized magnetic cellulose aerogel is prepared by the following preparation method: extracting cellulose from agricultural wastes, adding the cellulose into an alkali urea solution, freezing, unfreezing, and uniformly mixing with modified iron cobalt oxygen powder to obtain a mixture; adding polyethyleneimine and a cross-linking agent to form hydrogel, and freeze-drying to obtain the functionalized magnetic cellulose aerogel, the modified Fe-Co-O is obtained by mixing Fe-Co-O nano-powder and a tannic acid aqueous solution for reaction. The aerogel is doped with the modified Fe-Co-O, the material is endowed with the magnetic response characteristic, the tannic acid attached to the surface of the Fe-Co-O can form hydrogen bond interaction with the micro / nano plastic, and benzene rings contained in the tannic acid are beneficial to form pi-pi interaction with aromatic rings in the micro / nano plastic, so that the magnetic response property of the material is improved. The rapid adsorption between the aerogel and the micro / nano plastic is promoted.

The invention relates to a radioactive metal labeled antibody obtained by labeling an antibody with a radioactive metal. A functional chelate linker is coupled to the antibody, and the functional chelate linker is provided with: a chelate part capable of coordinating with a radioactive metal ion; and a functional unit having a function of improving intracellular retention. It is preferable that the functional unit has a structure obtained by polymerizing ethyleneimine or ethylene glycol, or a structure capable of binding to cathepsin B. The functional unit preferably has a structure obtained by polymerizing ethyleneimine at a degree of polymerization of 1-7 (inclusive).

The application provides a preparation method of a Chlorella-arsene composite drug delivery system and application thereof. The application prepares arsene nanosheets (ANs) through a liquid phase stripping method, and obtains catechol-polyethyleneimine nanoparticles (CA-PEI) through oxidation self-polymerization. The ANs and the CA-PEI are charge-absorbed to form CA-PEI loaded with ANs (CA-PEI@ANs), and then charge-absorbed with protein nucleus Chlorella (CP), so that a Chlorella-arsene composite drug delivery system (CP@CA-PEI@ANs) is successfully constructed. The preparation operation of the drug delivery system is simple, and the reproducibility is good, and the drug delivery system has a good application prospect. The protein nucleus Chlorella is used as a drug delivery carrier, so that the problems of high cost and complex synthesis process commonly existing in a targeted delivery carrier are solved, and the application has good tumor targeting effect, and is beneficial to better drug efficacy.

The present invention discloses an electrochemiluminescent compound, a preparation method thereof and an application thereof, wherein the structural formula of the electrochemiluminescent compound is: wherein n is 100-200, R1, R2, R3 and R4 are all selected from one of a Y group and a hydrogen group, and at least one of R1, R2, R3 and R4 is a Y group. The preparation method of the electrochemiluminescent compound comprises the following steps: dissolving an iridium-containing complex, N, N-diisopropylethylamine, N, N, N', N'-tetramethyl-O-(N-succinimide) urea tetrafluoroborate in N, N-dimethylformamide and mixing; adding a polyethyleneimine solution, performing an amide reaction, separating, and obtaining the electrochemiluminescent compound. The electrochemiluminescent compound (Ir-PEI) of the present invention can improve the water solubility of the iridium-containing complex, can also be used as a coreactant unit in the molecule to promote the generation of ECL signals, and can be used as an ECL active material to construct and prepare an iridium ECL reagent.

This invention discloses the preparation of a Janus composite membrane with a sandwich structure and its application in volume reduction of nuclear power plant decontamination wastewater. The Janus composite membrane consists of a hydrogel-like tannic acid / polypropylene glycol (PPG / TA) top layer, a highly adhesive biomimetic intermediate layer formed by polydopamine / polyethyleneimine / chitosan (PDA / PEI / CS), and a hydrophobic polytetrafluoroethylene (PTFE) substrate. Compared with traditional PTFE membranes, when the Janus composite membrane of this invention is applied to volume reduction of nuclear power plant decontamination wastewater, the asymmetric wettability of the Janus composite membrane prevents the foaming liquid of the decontamination wastewater from directly contacting the PTFE substrate and increases the capillary pressure at the membrane-liquid interface, thereby protecting its hydrophobic properties and continuously transporting water vapor. Compared with the monotonous negatively charged layer of the original commercial PTFE membrane, the rich hydrophilic functional groups of the modified layer of the Janus composite membrane further reduce the permeation rate of nuclides and other pollutants, with a nuclide rejection rate of over 99.95% and a permeate recovery rate of over 85%.

The invention discloses a polyethyleneimine / nitrogen-doped titanic acid nanotube composite material. The composite material comprises a nitrogen-doped titanic acid nanotube and polyethyleneimine bonded with the nitrogen-doped titanic acid nanotube through a hydrogen bond, the invention also discloses a preparation method of the polyethyleneimine / nitrogen-doped titanic acid nanotube composite material, and the preparation method specifically comprises the following steps: simultaneously adding the titanic acid nanotube and a polyethyleneimine solution into an ammonium salt solution, fully reacting, carrying out solid-liquid separation on the material, and carrying out heat treatment on a solid product obtained after separation to obtain the polyethyleneimine / nitrogen-doped titanic acid nanotube composite material. The composite material disclosed by the invention can be used for efficiently removing CBZ pollutants in a water body by coupling a photocatalysis technology with an enzyme-like catalysis technology.

A method for treating a pathogen, comprising the steps of: (1) providing a polyethylenimine in a solution, the polyethylenimine comprising a total cationic charge of protonated secondary amines of the polyethylenimine, the solution comprising anionic counterions associated with the protonated secondary amines; (2) tuning a protonated site of the polyethylenimine, in a formulation of the solution containing ions, to an activity coefficient (γ) in a range of 0.93 to 0.999; (3) forming from the formulation an antibacterial film, the antibacterial film comprising a mean thickness of less than 5 μm and the total cationic charge of the protonated secondary amines in a range of 0.1 to 1.8 C / in2; and (4) inactivating greater than 99% of first bacteria within less than five minutes of contact with the antibacterial film.

This invention discloses a method for preparing a self-healing, antibacterial dynamic hydrogel and its coating application. The method includes: 1. Reacting konjac glucomannan with sodium periodate to achieve aldehyde functionalization, and mixing it with sodium alginate powder to prepare a precursor polymer solution A; 2. Mixing an acylhydrazide or hydroxylamine small molecule crosslinking agent with an aminoglycoside drug to prepare an amino crosslinking agent solution B, and preparing a calcium salt ionic crosslinking agent solution C; 3. Mixing the three solutions and allowing them to stand to obtain a hydrogel. The application involves coating a hydrogel mixture solution onto a biodegradable metal surface after preparing a polyethyleneimine auxiliary layer and then gelling it. This invention utilizes aldehyde-functionalized oxidized konjac glucomannan and two crosslinking agents to form acylhydrazone, oxime, and imine bond networks, endowing the hydrogel with self-healing, self-responsive, and long-term antibacterial properties. The hydrogel of this invention improves the biocompatibility, antibacterial properties, and stability of biodegradable metal substrates, making it suitable for biodegradable implantation applications.

Provided in the present invention are an antimicrobial whitening composition, a white synthetic leather substrate and a preparation method therefor, and an antimicrobial synthetic leather. The antimicrobial whitening composition comprises a cationic antimicrobial agent, an antimicrobial organic substance and a solvent, wherein the cationic antimicrobial agent comprises at least one of a polymeric quaternary ammonium compound, polyethyleneimine, chitosan, a biguanide compound and a polymeric biguanide; and the antimicrobial organic substance comprises at least one of a terpene compound and a derivative thereof, a phenolic compound, an essential oil, an antifungal agent, a preservative and a disinfectant. The man-made leather prepared by means of the antimicrobial whitening composition of the present invention has good performance in terms of both long-lasting antimicrobial properties and maintaining a high whiteness.

The invention discloses a phenylboronic acid affinity deoxynojirimycin imprinted polymer nano-material as well as a preparation method and application thereof, and belongs to the fields of nano-material preparation and natural compound extraction and separation. Phenylboronic acid modified nano silica gel is used as a carrier, deoxynojirimycin is used as a template molecule, dopamine is used as a cross-linking agent, a polyethyleneimine hyperbranched strategy is further combined, a deoxynojirimycin molecularly imprinted polymer (MIPs-PEI) with boric acid affinity and pH response characteristics is constructed, and hyperbranched modification remarkably improves hydrophilicity and boric acid affinity sites of the material. The synthesized MIPs-PEI has good adsorption performance on deoxynojirimycin and can effectively enrich deoxynojirimycin in mulberry leaves, and the natural hypoglycemic alkaloid deoxynojirimycin is extracted in a green mode through the method.