4109 results about "Imine" patented technology

Disclosed in the present invention is a graphene oxide / covalent organic framework nanofiltration membrane. The nanofiltration membrane is prepared by mixing a graphene oxide nanosheet dispersion liquid and an imine covalent organic framework nanosheet dispersion liquid, and performing ultrasonic treatment, suction filtration and heat treatment. Further disclosed are a preparation method for the nanofiltration membrane and a use thereof. According to the present invention, a polymer film is used as a support layer, a covalent organic framework and graphene oxide are loaded on the support layer by means of vacuum filtration, and a cross-linked graphene / covalent organic framework nanofiltration membrane is prepared by a thermal crosslinking reaction after drying. The method involves simple and convenient operations and ingenious design, and the obtained membrane has excellent separation performance. By means of covalent bond crosslinking between the graphene oxide and the covalent organic framework, the structure of the membrane is more compact, thereby increasing the retention rate of the membrane for sodium sulfate and sodium chloride. In addition, covalent organic framework nanosheets provide straight channels for the nanofiltration membrane, thereby significantly improving the water permeability of the nanofiltration membrane.

The invention discloses preparation of an ionic porous nitrogen-rich molecular cage and application of the ionic porous nitrogen-rich molecular cage in purification of iodine-containing nuclear medical waste, and the preparation method comprises the following steps: taking an ammonia or amine reagent as a bridge, taking an aldehyde or ketone reagent as a reaction monomer, adopting a Schiff base reaction principle, and utilizing a polydentate coordination mode to carry out imine condensation reaction on substances through a one-pot method to obtain the ionic porous nitrogen-rich molecular cage. Generating a porous nitrogen-rich molecular cage; then adding a reducing agent to further reduce the porous nitrogen-rich molecular cage, then combining with alkyl halide and an organic solvent, stirring, and carrying out rotary evaporation to obtain the ionic porous nitrogen-rich molecular cage. The method has the beneficial effects that a porous organic cage material with an ionic nitrogen-rich ligand is selected as an adsorbent, so that the physical and chemical properties are stable; the preparation method is simple in synthesis and high in yield, and the nitrogen-rich ligand is stable in structure, can adsorb iodine in a gas phase and iodine in a water phase, and can be recycled; the ion interference resistance is high, and the method adapts to iodine adsorption under the water phase condition that the pH is 3-11; the method can be applied to treatment of iodine in nuclear medical wastewater.

The invention relates to the technical field of environmental materials and water treatment, in particular to a graphene amino silica gel composite adsorbent for heavy metal wastewater treatment and a preparation method thereof.The graphene amino silica gel composite adsorbent is prepared from # imgabs0 nanoparticles, an amino-functionalized silicon dioxide coating layer, carboxylated reduced graphene oxide, a polydopamine modification layer and tetraethyl orthosilicate; the coating is prepared from the following raw materials: 3-aminopropyltriethoxysilane, 3-mercaptopropyltrimethoxysilane, N-((4-vinyl benzyl) amino) diacetic acid, chitosan, beta-cyclodextrin, hexadecyl trimethyl ammonium bromide, polyethylene glycol, L-ascorbic acid, 1-ethyl-3-(3-dimethyl aminopropyl) carbodiimide hydrochloride and N-hydroxysuccinimide. The composite adsorbent shows excellent adsorption performance on various heavy metal ions, and the adsorption performance is far higher than that of traditional adsorption materials and existing composite adsorbents.

The invention discloses an environment-friendly slow release fertilizer and a preparation method thereof, and belongs to the technical field of fertilizer mixture preparation. The preparation method comprises the following steps: mixing and stirring a mussel extract-polysaccharide-nitrogen fertilizer complex, an inorganic fertilizer and water according to a weight part ratio of (1-2): (5-7): (15-23), heating to 50-60 DEG C to form a dispersion solution, mixing and stirring the dispersion solution and a calcium salt according to a weight part ratio of 1: (0.005-0.01), cooling to 20-25 DEG C, and reacting for 20-24 hours to obtain a viscous mixture; and drying, dewatering and crushing the viscous mixture to obtain the environment-friendly slow-release fertilizer. According to the environment-friendly slow-release fertilizer, the mussel extract with a good adhesion effect and the carboxymethyl cellulose or the hyaluronic acid with biocompatibility are used as carriers, through the synergistic cooperation of an amide structure, an imine structure and metal coordination, wrapping of a nitrogen fertilizer and an inorganic fertilizer is achieved, and finally the environment-friendly slow-release fertilizer is obtained.

The present invention relates to a polyisocyanate composition comprising at least one bridging cistetrahydrofuran-2,5-diyl-dimethylene unit and at least one isocyanurate, iminooxadiazinedione, allophanate, urethane, urea, uretdione, oxadiazinetrione, carbodiimide, thiourethane, thioallophanate and / or biuret structure and / or comprising at least one bridging trans-tetrahydrofuran-2,5-diyl)-dimethylene unit and at least one isocyanurate, iminooxadiazinedione, allophanate, urethane, urea, uretdione, oxadiazinetrione, carbodiimide, thiourethane, thioallophanate and / or biuret structure.

The invention discloses a preparation method of a dual PDE3 / 4 inhibitor Encephaline. The preparation method comprises the following steps: carrying out a sizuki coupling reaction on initial raw materials of a compound shown as a formula 1 and a compound shown as a formula 2 to obtain a compound shown as a formula 3, carrying out intramolecular cyclization to obtain a compound shown as a formula 4, converting carbonyl into a compound shown as a formula 5 by using POCl3, and carrying out an alkylation reaction on the compound shown as a formula 5 and a compound shown as a formula 6 to obtain a compound shown as a formula 7. Wherein the acyl imine of the compound as shown in the formula 7 and a compound as shown in a formula 8 are subjected to substitution reaction to obtain the product Encephaline. The selected raw materials are easy to obtain, the operation method is simple and convenient, the product yield is high, and the method is suitable for batch production.

The present invention relates to the technical field of nanofiltration membranes, and particularly relates to a preparation method for a positively charged nanofiltration membrane for improving a "trade-off" effect. The preparation method comprises the following process: sequentially adding a water phase and an oil phase to the surface of a support layer to perform a reaction, so as to prepare a polyamide layer; pouring in a functionalized graphene dispersion; and sequentially placing same into an N,N-dimethyl propane diamine solution, a sodium borohydride solution and an iodomethane solution to perform a reaction, so as to obtain a nanofiltration membrane, wherein the functionalized graphene is pyrrolidone-based graphene. According to the present invention, a mixture of piperazine and polyethyleneimine is used as a water phase and is subjected to interfacial polymerization with an oil phase 1,3,5-trimesoyl chloride on the surface of the support membrane; and by means of the compounding of micromolecular piperazine and macromolecular polyethyleneimine, the rapid formation of a polyamide layer is promoted, the distance of a system cross-linked network is increased, a positively charged polyamide layer having a large pore diameter and good hydrophilicity is formed, and a good water flux and a good rejection rate are achieved, thereby improving the "trade-off" effect.

The invention relates to the technical field of automobile tires, and discloses a new energy automobile tire self-repairing sealing material adhered with mute cotton. The preparation method comprises the following steps: adding a modified polyurethane adhesive, C5 petroleum resin and a modified carbon nanotube filler into absolute ethyl alcohol, mixing to obtain a self-repairing liquid, adhering polyurethane cotton to the upper part of the self-repairing liquid, and drying to obtain the new energy automobile tire self-repairing sealing material adhered with the mute cotton. Disulfide bonds, boric acid ester bonds and imine bonds introduced into polyurethane through a chain extension reaction and diselenide bonds introduced into carbon nanotubes all belong to dynamic covalent bonds, so that the self-repairing performance of the material is improved; by introducing a rigid benzene ring and naphthyl aromatic structure, the mechanical property of the self-repairing sealing material is improved; the carbon nano tube can play a role in skeleton supporting in a polyurethane matrix, and the mechanical property of the material is further improved by introducing an adamantane rigid structure into the carbon nano tube.

The invention discloses a temperature / CO2 dual-response zwitterionic hydrogel profile control agent, which is prepared by taking a monomer A, a monomer B and a monomer C as raw materials, adding a cross-linking agent and an initiator, and carrying out polymerization reaction in a water medium. The monomer A is selected from any one of acrylamide, acrylic acid and 1-vinyl-2-pyrrolidone; the monomer B is selected from any one of [2-(methacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide, 2-methacryloyloxyethyl phosphorylcholine and 3-((2-(methacryloyloxy) ethyl) dimethylamino) propionic acid inner salt; and the monomer C is selected from any one of 2-(dimethylamino) ethyl methacrylate, dimethylamino propyl methacrylamide and polyethyleneimine. The profile control agent has double swelling mechanisms, has outstanding temperature and salt resistance, resists 220000 mg / L of mineralization water, is suitable for high-salt reservoirs, and is good in long-term aging property.

The invention discloses a preparation method of a pyrazolone amino-acid ester derivative. The pyrazolone amino-acid ester derivative is obtained through three-component cascade reaction by taking pyrazolone imine, a pentafluorophenylacetate derivative and alcohol as reactants and chiral isothiourea as a catalyst. According to the invention, challenges of competitive side reactions between a plurality of reaction substrates and intermediates and stereoselectivity control are overcome, the application range of the substrate combination of the existing system is broken through, and synthesis of a series of pyrazolone amino-acid ester derivatives is realized in a green and efficient manner. According to the method disclosed by the invention, substrate preassembly is not needed, transition metal catalysis is not needed, raw materials and the catalyst are cheap and easy to obtain, reaction conditions are mild, and the substrate application range is wide. In addition, the invention also provides a new way for introducing the medicine bioactive molecules into the synthesis of the pyrazolone amino-acid ester compound.

The invention relates to the technical field of chemical synthesis, and particularly provides a preparation method of a semaglutide side chain, which comprises the following steps: step S1, carrying out reaction on octadecanedioic acid mono-tert-butyl ester and trifluoroacetic acid pentafluorophenyl ester to generate a first intermediate; s2, enabling the first intermediate to react with 1-tert-butyl L-glutamic acid to generate a second intermediate; s3, enabling the second intermediate to react with pentafluorophenyl trifluoroacetate to generate a third intermediate; and S4, carrying out an amidation reaction on the third intermediate and 17-amino-10-oxo-3, 6, 12, 15-tetraoxa-9-aza-heptadecanoic acid, so as to generate a semaglutide side chain, and carrying out an amidation reaction on the third intermediate and 17-amino-10-oxo-3, 6, 12, 15-tetraoxa-9-aza-heptadecanoic acid. According to the preparation method disclosed by the embodiment of the invention, the pentafluorophenyl trifluoroacetate is used as the condensation reagent for two times to activate the carboxylic acid, and the amidation reaction is carried out for two times to construct the amido bond after each activation, so that compared with the traditional carbodiimide and urea positive ion type condensation reagent, the chiral racemization in the condensation process can be effectively avoided, and the yield of the product is improved. The condensation chiral racemization impurity can be lower than 0.3%.

The invention belongs to the technical field of polyurethane pouring sealants, and particularly relates to a hydrolysis-resistant heat-conducting polyurethane pouring sealant and a preparation method thereof. The hydrolysis-resistant heat-conducting polyurethane pouring sealant is prepared from a component A and a component B according to the mass ratio of 100: (18.5-20.5), and the component A comprises the following raw materials: amine ether polyol, modified castor oil, a flame retardant, a heat-conducting filler, a silane coupling agent and a catalyst; the component B is prepared from the following raw materials: polymerized MDI (Diphenyl Diisocyanate), MDI-50 and carbodiimide modified MDI; the amine ether polyol is prepared by carrying out a reaction on 3, 3 '-dimethyl-4, 4'-diaminodiphenylmethane and epoxypropane. The hydrolysis-resistant heat-conducting polyurethane pouring sealant disclosed by the invention not only has good technological operation performance and heat-conducting performance, but also has excellent hydrolysis resistance, and still has good mechanical property and electrical insulation property after being aged; the invention also provides a scientific, reasonable, simple and feasible preparation method.

The invention relates to a preparation method of a nanofiltration membrane containing a covalent organic framework (COF) interlayer. The nanofiltration membrane (NF) comprises a base membrane, an interlayer and a separation surface layer. The interlayer is formed by in-situ growth of polyphenol and diamine under the action of an oxidizing agent, and the separation surface layer is formed by an aqueous-phase active monomer and multi-element acyl chloride through an interfacial polymerization reaction. According to the invention, an imino covalent organic framework (TpPa-COF) film interlayer is introduced, and a surface polyamide layer is prepared through interfacial polymerization, so that the hydrophilicity of the film and the ability of removing divalent cations are improved. The invention aims to solve the problem of balance between low flux and high separation effect of an NF membrane in separation of monovalent / divalent cations, maintain ideal water flux while ensuring high separation effect, and solve the problem that a traditional NF membrane separation layer has defects. The two-dimensional TpPa-COF material can effectively control the pore size distribution and hydrophilicity of the surface of the substrate and improve the separation performance of the composite membrane. The preparation method is simple, and the obtained nanofiltration membrane has a wide application prospect.

The invention relates to the technical field of three-proofing paints, in particular to a UV moisture dual-curing three-proofing paint and a preparation method thereof. The conformal coating is prepared from the following raw materials in parts by weight: 10-80 parts of acrylate resin; 20 to 60 parts of a UV reactive diluent; 3-15 parts of a polyurethane latent curing agent; 1 to 10 parts of a photoinitiator; 1-5 parts of a dewatering agent; the acrylic resin comprises at least one of urethane acrylate and isocyanate modified acrylate. According to the invention, when the specific curing agent is selected, especially the oxazolidine latent curing agent or imine latent curing agent containing at least two oxazolidinyl groups is adopted, the curing time of the conformal coating in a dark environment can be greatly shortened, and meanwhile, the problems of bubbles, pinholes and the like caused by moisture in the curing process of the conformal coating can be effectively solved; good market application values are realized.

The invention belongs to the technical field of environmental protection, and provides a preparation method of an imine-modified functionalized mesoporous magnetic silicon dioxide nano material. The method comprises the following steps: synthesizing Fe3O4 magnetic nanoparticles in a Fe < 2 + > / Fe < 3 + > alkaline hydrolysis system through a coprecipitation method; then coating the magnetic nanoparticles with an amorphous silicon dioxide layer by taking TEOS (tetraethoxysilane) as a silicon source by adopting a sol-gel method, so as to prepare magnetic silicon coated nanoparticles; the prepared nano-particles are subjected to secondary silicon coating guided by a cetyl trimethyl ammonium bromide (CTAB) mesoporous template agent, and mesoporous magnetic silicon nano-particles are formed after calcination; and finally, carrying out surface amination modification on the mesoporous magnetic silicon nano-particles by utilizing an amino silane coupling agent, and then carrying out condensation reaction on the mesoporous magnetic silicon nano-particles and various aldehyde derivatives to construct imine bonds, so as to obtain the imine-modified functionalized mesoporous magnetic silicon dioxide nano-material. The imine-modified functionalized mesoporous magnetic silicon dioxide nano-material formed by the invention has the characteristics of efficient adsorption, rapid magnetic recovery and excellent environmental stability, and can effectively remove polystyrene micro-plastics and organic pollutants in a water body.

Methods for making high-purity LiFSI salts and intermediate products using one, the other, or both of a reactive-solvent removal / replacement method and an LiFSI purification method. In some embodiments, the reactive-solvent removal / replacement method includes using non-reactive anhydrous organic solvents to remove and / or replace one or more reactive solvents in a crude LiFSI. In some embodiments, the LiFSI purification method includes using anhydrous organic solvents to remove impurities, such as synthesis impurities, from a crude LiFSI. In some embodiments, crude LiFSI can be made using an aqueous-based neutralization process. LiFSI salts and products made using methods of the disclosure are also described, as are uses of such salts and products and electrochemical devices that include such salts and products.

The invention relates to the technical field of biogenic amine detection, in particular to a dicyanoethylene-based fluorescent material as well as a preparation method and application thereof. After the biogenic amine is in contact with the glass surface fluorescent probe, due to the nucleophilic characteristic of the biogenic amine, the biogenic amine can be subjected to nucleophilic substitution reaction with a probe molecule dicyanovinyl group to generate an imine chemical structure. As the electron-withdrawing capability of dicyanoethylene is stronger than that of imine, the intramolecular charge transfer effect of probe molecules is greatly reduced, so that blue shift of absorption and luminescence properties of the probe molecules is caused, and after the fluorescent probe is loaded on the surface of glass, the fluorescence intensity of the fluorescent probe is improved. The formed dicyanoethylene-based fluorescent material provides a solution for the technical problem that the existing biogenic amine detection mode is inconvenient.

The imine reductase mutant provided by the invention can catalyze asymmetric reductive amination of ethyl 3-formylhexanoate and (S)-2-aminobutanamide to synthesize brivaracetam, two chiral centers of brivaracetam are constructed in one step, and the problems of poor environmental protection property, low atom utilization rate, long route and the like in the existing industrial synthesis route are solved. Wide application prospects are realized.

The invention discloses a copolyimide film with low dielectric constant and low thermal expansion coefficient and a preparation method thereof, and the preparation method comprises the following steps: reacting 0.019-0.021 mol of aromatic dianhydride and 0.017-0.023 mol of diamine unit in 0.45-0.48 mol of solvent, then adding 0.0004 mol of end-capping reagent dissolved in 0.13-0.15 mol of solvent, and reacting to prepare polyamide acid with a main chain containing o-hydroxyl; the diamine unit comprises 10-40 mol% of a monomer with a main chain containing o-hydroxyl and the balance of aromatic diamine; performing film coating and thermal imidization on polyamide acid to prepare a polyimide film; and heating to carry out thermal rearrangement reaction on the o-hydroxyl to obtain the copolyimide film with the main chain containing the oxazole ring. The dielectric constant of the prepared copolyimide film is 2.7-3.0, and the thermal expansion coefficient of the copolyimide film is 19.5-26.5 ppm / K.

The invention provides a hyperbranched polysiloxane coating corrosion inhibitor and a preparation method thereof, a hyperbranched polysiloxane epoxy anticorrosive paint and a preparation method and application thereof. The hyperbranched polysiloxane coating corrosion inhibitor is prepared by catalytic reaction of p-dimethylaminobenzaldehyde and small molecular silane in an alcoholic solution. The coating comprises 30-50 parts of epoxy resin, 20-35 parts of a hyperbranched polysiloxane coating corrosion inhibitor, 5-10 parts of an active diluent, 2-2.5 parts of a silane coupling agent, 15-30 parts of filler, 1.5-2.5 parts of an auxiliary agent and 15-20 parts of a curing agent. Compared with the prior art, an imine group in hyperbranched polysiloxane and a metal substrate form a stable complex, the stable complex is adsorbed on the metal surface to form a protective film, the erosion rate of a corrosive medium to the metal substrate is effectively reduced, the corrosion resistance of a coating is improved, meanwhile, the coating prepared by adopting the reactive diluent is high in solid content and good in corrosion resistance, and the service life of the coating is prolonged. VOC emission in the paint film curing process is low.

The invention relates to a preparation method of a porous polyimide low-dielectric material. The method comprises the following specific steps: preparing a polyamide acid solution with a certain solid content under an ice-water bath condition; after the solution is recovered to normal temperature, adding a certain amount of sodium alginate, and after the solution is homogenized, adding a catalyst and a dehydrating agent for chemical imidization; the method comprises the following steps: coating a substrate medium with a solution after a certain time of reaction, standing in air for a certain time, sequentially and respectively placing the substrate medium in ethanol and a hot water bath for replacement for a certain time, airing at normal temperature, and transferring to a high-temperature oven for gradient cyclization to realize complete imidization. According to the method, conditions are mild and easy to control, and the low-dielectric film material which is flat in appearance and ordered in structure is prepared only through a normal-pressure drying method.

The present invention relates to a novel method for synthesizing olefin covalent organic framework foams, and polyimide, imine, hydrazone or Ketoenamine covalent organic frameworks (COFs). The method is a green synthetic strategy, including: under non-solvent condition, performing condensation reaction of a methyl-containing monomer and an aldehyde monomer with participation of acid anhydride or carboxylic acid compound to prepare olefin COFs; performing condensation reaction of a multihead acid anhydride or a multihead carboxylic acid monomer and an amino monomer with participation of acid anhydride or carboxylic acid compound to prepare amide COFs; and performing condensation reaction of the aldehyde monomer and the amino monomer with participation of acid anhydride, imidazole or carboxylic acid compound to prepare imine COFs. The COFs obtained by using the method have large specific surface area, regular and adjustable porous structure, and high crystallinity. The method effectively avoids use of organic solvent and risk of high pressure in the reaction process, and is suitable for large-scale preparation of COF materials.

The invention discloses preparation and application of an imido covalent organic framework material containing imidazolyl ionic liquid. The imido covalent organic framework material (ILs-TPN-COFs) containing the imidazolyl ionic liquid is obtained by connecting the imidazolyl ionic liquid [CnCmILs (at) Br] to an imido covalent organic framework TPN-COFs through a covalent bond. The material has an ionic liquid tertiary amine N active site and a halogen anion active site, and can promote CO2 activation and ring opening of epoxide. The ILs-TPN-COFs catalytic material has the advantages of uniform distribution of active sites, better stability, easiness in separation of the catalyst from a reaction system, better repeatability and the like. According to the invention, the prepared novel ILs-TPN-COFs material is applied to catalysis of synthesis of propylene carbonate from carbon dioxide and epoxypropane, and shows excellent catalytic performance under mild reaction conditions.

The invention relates to the technical field of dielectric material preparation, in particular to a semi-aromatic polyimide dielectric film and a preparation method thereof. The preparation method of the semi-aromatic polyimide dielectric film comprises the following steps: mixing an aliphatic dianhydride monomer, a rigid diamine monomer containing a side ethyl group and a solvent, carrying out a copolymerization reaction to obtain a pre-polymer solution, forming a film from the pre-polymer solution, and carrying out an imidization reaction to obtain the semi-aromatic polyimide dielectric film, wherein the imidization reaction comprises a first heat preservation stage, a second heat preservation stage and a third heat preservation stage. The cross-linking density is improved by introducing an ethyl side chain into a semi-aromatic polyimide structure, meanwhile, a short-range ordered structure is controlled by adopting a specific imidization process, the structure of the obtained dielectric film is controlled from the molecular level, and the high-temperature energy storage performance of the dielectric film is remarkably improved.

The invention discloses low-dielectric fluorine-containing silane modified polyimide and an application thereof. The structural formula of the low-dielectric fluorine-containing silane modified polyimide is # imgabs0 #; r1 is a fluorine-containing silane group; r2 is an aromatic anhydride group; aR is an aromatic group; and Ar'and Ar ''are one of phenoxy benzene groups or fluorine-containing biphenyl groups. The preparation method comprises the following steps: dissolving a hydroxyfluorene diamine compound, ether-containing polyamine and fluorine-containing polyamine in a polar organic solvent in an inert atmosphere, and then adding dianhydride and an end-capping reagent for condensation polymerization to obtain polyamide acid; the preparation method comprises the following steps: mixing polyamide acid, a water-carrying agent and fluorine-containing silane, and carrying out imidization reaction to obtain the low-dielectric fluorine-containing silane modified polyimide. The fluorine-containing silane polyimide prepared by the invention has a large-volume fluorenyl structure, flexible ether bonds, a silane structure and fluorine atoms with relatively high electronegativity, so that the prepared fluorine-containing silane polyimide has relatively low dielectric properties, and the processability of the polyimide and the solubility of the polyimide in various organic solvents are also improved.

The invention discloses a method for evaluating the imidization degree of high-voltage-resistant polyimide, and belongs to the technical field of manufacturing of passivation layers of high-voltage power devices. The evaluation method comprises the following steps: acquiring Fourier infrared spectrograms of a standard test sample A and an experimental test sample B, acquiring and comparing absorption peak intensities of the standard test sample A and the experimental test sample B near an imine I band and a benzene ring stretching vibration peak, and calculating the imidization degree R1 of the test samples; acquiring and comparing the absorption peak intensities of the standard test sample A and the experimental test sample B in an imine III band and near a benzene ring stretching vibration peak, and calculating the imidization degree R2 of the test samples; and obtaining the imidization degree R according to the imidization degrees R1 and R2 of the test sample. According to the evaluation method, the imidization degree of the polyimide film can be quantitatively evaluated through the absorption peak intensity ratio of the polyimide film at the specific wave number, so that whether the imidization degree is sufficient or not when the thickness of the polyimide film is too high is evaluated.

The invention relates to the technical field of organic supramolecular chemical materials, in particular to an octyloxy-modified imine gelator, bi-component gel of the octyloxy-modified imine gelator and a preparation method and application of the octyloxy-modified imine gelator. The gelator is a symmetric o-octyloxy modified p-phenylenedialdehyde-maleonitrile imine gelator, and has an obvious aggregation-induced emission property; the gelator and the cholesteryl half-ester gel can form double-component organic gel without fluorescence emission in an organic solvent; the fluorescence-emission-free double-component gel formed in tert-butyl alcohol is red fluorescence-emission gel when meeting water, and is converted into blue fluorescence-emission gel when meeting NaClO, so that water and NaClO can be rapidly and intuitively detected; the gelator has fluorescence enhancement and blue shift after encountering NaClO in a solution state, has fluorescence'off-on 'detection on NaClO, has fluorescence emission intensity reduced after Hg < 2 + > is added in the solution state, and has fluorescence'on-off' detection performance on Hg < 2 + >.

The invention discloses a method for melt catalysis modification of a bamboo powder / polypropylene composite material and application, and the preparation method of the composite material comprises the following steps: uniformly spraying a composite silane coupling agent water-alcohol solution on the surface of bamboo powder, and drying to obtain modified bamboo powder; polypropylene, silicone master batches (containing 50% of polydimethylsiloxane), the modified bamboo powder and a cobalt acetylacetonate / manganese acetylacetonate catalyst are uniformly mixed in different temperature zones, melt extrusion is performed, and the modified bamboo powder / polydimethylsiloxane / polypropylene composite material is prepared. The alkoxy group of the composite silane coupling agent is hydrolyzed to form silanol, the silanol reacts with the hydroxyl group on the surface of the bamboo powder to form a hydrogen bond, the hydrogen bond is condensed into a covalent bond, meanwhile, the amino group and the imino group in the coupling agent can also form a hydrogen bond with the hydroxyl group, and hydrophobic modification is conducted on the bamboo powder. Polydimethylsiloxane in the silicone master batch and silicon hydroxyl on the surface of the modified bamboo powder are subjected to a dehydrogenation reaction through fusion catalysis, stable chemical bonds are generated, an interface layer is formed, and the effect of enhancing the compatibility between the bamboo powder and polypropylene is achieved.

The invention belongs to the technical field of targeting exosome preparation, and particularly relates to a targeting modification method of a rose exosome, a hyaluronic acid modified rose exosome and application of the hyaluronic acid modified rose exosome. The method comprises the following steps: dissolving hyaluronic acid in a rose exosome, adding 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide and N-hydroxysuccinimide, carrying out a reaction for 8-16 h, carrying out centrifugation, and carrying out resuspension precipitation so as to obtain a hyaluronic acid modified rose exosome; the volume mass ratio of the hyaluronic acid to the rose exosome solution is 1 mg: (0.5-1) ml, and the hyaluronic acid, the 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide and the N-hydroxysuccinimide are in an equal molar ratio. The characteristic that hyaluronic acid is highly compatible with an inflammatory cell CD44 receptor is utilized, the targeting property of the rose exosome to inflammatory cells is enhanced, and the utilization rate and the anti-inflammatory effect of the rose exosome are further improved.

The invention provides a polyimide multilayer composite membrane material as well as a preparation method and application thereof, and belongs to the technical field of gas separation. According to the method, through collaborative design of a functional support layer, a gradient MOF layer and an ultrathin selection layer structure, the problems of support layer pore seepage, MOF agglomeration, weak interface bonding and the like in an existing composite membrane material are solved. The preparation method comprises the following steps: firstly, carrying out electrostatic spinning on a polyamide acid glue solution, and synchronously introducing dopamine by adopting a chemical imidization method to prepare a functionalized polyimide fiber membrane containing hydroxyl and amino on the surface, so that the mechanical property of a supporting layer and the MOF anchoring capability are remarkably improved; growing MOF layers with different particle sizes on the surface of the fiber membrane by regulating and controlling the concentration gradient of ligand / metal salt and the reaction time, and passivating through a silane coupling agent after each step of growth so as to avoid heterogeneous nucleation and construct a gradient structure; after the MOF gradient layer is subjected to Ar plasma pretreatment to introduce hydroxyl, the ultrathin polyamide selection layer is formed by utilizing interfacial polymerization of fluorine-containing acyl chloride and a macrocyclic amine monomer, and the ultrathin polyamide selection layer is suitable for gas separation work.