118 results about "Cross linked membrane" patented technology

The present invention is for high performance UV-cross-linked membranes from polymers of intrinsic microporosity (PIMs) and the use of such membranes for separations. More specifically, the invention involves the methods of making UV-cross-linked membranes from PIMs. These membranes were prepared by cross-linking the UV-cross-linkable membranes from PIMs by exposure to UV-radiation. Pure gas permeation test results demonstrate that the UV-cross-linked membranes from PIMs exhibit CO2 / CH4 performance well above the Robeson's polymer upper bound trade-off curve for CO2 / CH4 separation. They have more than doubled selectivity for CO2 / CH4 and extremely high permeability of CO2 compared to the original UV-cross-linkable membranes from PIMs. These membranes also show excellent separation performance for CO2 / N2, H2 / CH4, O2 / N2, and propylene / propane separations. These high performance UV-cross-linked membranes are very useful for gas and liquid separations such as CO2 / CH4, CO2 / N2, H2 / CH4, O2 / N2, olefin / paraffin, deep desulfurization of gasoline and diesel fuels, and ethanol / water separations.

A compressible substrate coated at least in part with a waterborne coating composition comprising at least one base neutralized active hydrogen containing film-forming resin and a water dispersible carbodiimide crosslinker capable of reacting with the film-forming resin to form a crosslinked film is disclosed. An article of manufacture having at least two different flexible substrates coated at least in part with such a coating is also disclosed.

The invention provides an aqueous cosmetic composition for providing a durable crosslinked film on a keratinous substrate having at least two water-based film-form polymers including at least one water-based self-crosslinking film-form polymer. The self-crosslinking film-form polymer has functional groups capable of crosslinking with each other after the cosmetic composition is placed on the keratinous substrate. The aqueous cosmetic composition as whole forms a film on keratinous substrate that adheres to the keratinous substrate and is removable and durable.

An electrochemical cell, such as a capacitor or a secondary battery, is formed with a heat-resistant separator comprising a crosslinked membrane. The heat resistant separator is formed by exposing a polymeric membrane to a suitable condition, such as electron beam irradiation, to form the cross linked separator. In certain embodiments, the heat-resistant separator can be in the form of a laminate. In other embodiments, the heat-resistant separator includes inorganic particulate additives. The separator improves both safety and electrochemical performance of electrochemical cells, including lithium-ion batteries, such as by protecting against off-normal thermal abuse conditions and internal shorts from dendrite formation. The heat-resistant separator also provides improvements in high-rate and power density performance capabilities of secondary batteries.

This invention discloses a composition of, a method of making, and an application of high plasticization-resistant chemically cross-linked organic-inorganic hybrid membranes such as cross-linked cellulose acetate-cellulose triacetate-polyurethanepropylsilsesquioxane membranes. These cross-linked membranes with covalently interpolymer-chain-connected hybrid networks were prepared via a sol-gel condensation polymerization of cross-linkable organic polymer-organosilicon alkoxide precursor membrane materials. CO2 plasticization tests on these cross-linked membranes demonstrate extremely high CO2 plasticization resistance under CO2 pressure up to 5516 kPa (800 psig). These new cross-linked membranes can be used not only for gas separations such as CO2 / CH4 and CO2 / N2 separations, O2 / N2 separation, olefin / paraffin separations (e.g. propylene / propane separation), iso / normal paraffins separations, but also for liquid separations such as desalination.

The invention discloses a click chemistry based metal-organic framework cross-linking membrane and a preparation method and application thereof.Polymerizable double bonds are introduced into MOFs (metal-organic frameworks) through a post-synthetic modification method, and the chemical cross-linking type MOF membrane is prepared in situ by thiol-ene click reaction, so that a novel rapid efficient solvent-free method mild in conditions is provided for MOFs membrane synthesis.By means of applying the strategy, an obtained independent homogeneous MOFs hybrid membrane material is excellent in membrane forming performance and toughness, and the defects of agglomeration of MOFs crystals and poor compatibility between the MOFs and polymers are overcome.The synthesized MOFs membrane material is excellent in selective separation effect on dye molecules in water and has a promising application prospect in the field of membrane separation.

A preparation method for molecular recognition sensor by electrodeposition is provided. The preparation method is as following: forming molecularly imprinted polymeric micelles by self-assembly of ionic type photosensitive copolymers; forming a film on the surface of an electrode by electrodepositing the molecularly imprinted polymeric micelles at a constant potential; crosslinking the electrodeposited micellar film via ultraviolet light irradiation; extracting the template molecules from the crosslinked film to obtain electrode modified by the molecularly imprinted polymeric micellar film; and connecting the modified electrode with a sensor device and a computer to construct a molecular recognition sensing system capable of specifically detecting the template molecules.

The present invention belongs to the technical field of functional polymer materials and electrochemistry and in particular relates to a sulfonated polybenzimidazole cross-linked proton exchange membrane and a preparation method thereof. In the present invention, a synthesized side chain is provided with sulfonated polybenzimidazole with a cross-linked group of an amino group, and a membrane liquid is prepared from a product obtained above, a graphene oxide cross-linking agent is added, and reacts with the amino group, and a sulfonated polybenzimidazole polymer is subjected to cross-linking in a membrane forming process. The cross-linked membrane has the good mechanical property, and relatively high proton conduction rate, hydrolytic stability and anti-oxidation stability. The method provided by the present invention is good in control performance; and compared with a conventional sulfonated polybenzimidazole membrane, the sulfonated polybenzimidazole cross-linked proton exchange membrane has the high mechanical strength, high anti-hydrolysis and anti-oxidation performances, good dimensional stability, high proton conduction rate, and a wide application prospect in polymer electrolyte membrane fuel cells.

The invention discloses a preparation method of a side chain crosslinked polymer and a side chain crosslinked polymer anion exchange membrane of the side chain crosslinked polymer. The invention mainly comprises the steps of the preparation of a polyether sulfone polymer precursor, the preparation of a chloromethyl ether sulfone polymer and the preparation of the side chain crosslinked polymer anion exchange membrane. The preparation process provided by the invention has the advantages of simplicity, and controllable ion exchange capacity and degree of crosslinking. Compared with the existing non-crosslinked membrane, the membrane prepared by the method provided by the invention has the advantages of uniform structure, good stability of size and high ion conductivity under a lower IEC (ion-exhange column chromatography) level.

The invention discloses an anti-pollution composite graphene oxide nanofiltration membrane. The anti-pollution composite graphene oxide nanofiltration membrane comprises a base membrane and a graphene oxide membrane used as a separation layer, the base membrane is covered with the graphene oxide membrane, and the graphene oxide membrane is covered with a cross-linking membrane for protecting the graphene oxide membrane, wherein the cross-linking membrane is obtained through cross-linking polyvinyl alcohol and a cross-linking agent, the cross-linking agent is dialdehyde or maleic anhydride, and the cross-linking membrane has a porous structure. The invention also discloses a method for producing the anti-pollution composite graphene oxide nanofiltration membrane. The production method comprises the production of a cross-linking layer. The method is simple to operate and is easy to implement.

This invention relates to cross-linked block polymer anion exchange membrane, a preparation method and applications thereof. According to the method, during the membrane preparing, a chloromethylatedblock polymer is simultaneously cross-linked and aminated by using a one-step method; after the membrane is formed, the membrane is further quaternized with tertiary amine; and alkalization is performed to obtain the cross-linked anion exchange membrane. According to the present invention, the polymer is chloromethylated by using the environmentally-friendly low-toxicity 1,4-dichloromethoxybutaneas a chloromethylating agent, the cross-linking and amination of the polymer is performed with the tertiary amine during the membrane forming, and after the membrane forming, the re-amination is performed with the tertiary amine so as to increase the number of the quaternary ammonium groups; with the method, the cross-linking and the quaternization are performed simultaneously during the membraneforming, such that the mechanical strength and the dimensional stability of the cross-linked membrane are improved, and the quaternization efficiency is effectively increased; and the obtained cross-linked anion exchange membrane has high conductivity, and has potential application prospects in alkaline anion exchange membrane fuel cells.

The invention relates to the technical field of the anti-adhesive membrane for surgeries, and in particular to a method for preparing an anti-adhesive membrane for surgeries. The method comprises the following steps of: dissolving sodium hyaluronate and hydroxyethyl cellulose or hydroxy propyl cellulose or carboxymethylcellulose in de-ionized water to form a solution, and adjusting the pH value to be 10-12, thereby obtaining an alkaline solution; adding 1,4-butanediol diglycidyl ether to the alkaline solution, stirring evenly, and reacting at 40-50 DEG C; adjusting the pH value of the reaction liquid to be 2-5, pouring the reaction liquid into a die for tape casting, reacting at 40-50 DEG C and drying, thereby forming the membrane. The method provided by the invention can be used for obviously improving the anti-adhesive effect, flexibility and film forming effect of the cross-linked membrane. The membrane obtained by the method provided by the invention has excellent biocompatibility, and good functions of resisting adhesion, stopping bleeding, promoting healing and resisting inflammation; and simultaneously, the membrane is appropriately adjustable in degradation time and wide in application range.

The invention discloses a polybenzimidazole / polyvinylbenzyl chloride cross-linked high temperature proton exchange membrane with high oxidation resistance, and a production method thereof. The cross-linked membrane adopts polybenzimidazole as a polymer skeleton, a cross-linked netted structure is formed in the membrane through a polymerization reaction by using the polyvinylbenzyl chloride as a cross-linking agent, and spraying of two sides of the membrane is carried out to produce anti-oxidation layers with strong free radical quenching ability in order to produce the high temperature proton exchange membrane with high oxidation resistance and high conductivity. The cross-linked high temperature proton exchange membrane has good proton conduction ability and excellent dimension stability without moistening, also has high oxidation resistance, can effectively solve the problem of polymer skeleton life shortening caused by attack of free radicals, and can be applied as a proton exchange membrane to high temperature proton exchange membrane fuel cells, direct alcohol fuel cells, electrochemical sensors or other electrochemical devices.

The invention relates to a method for preparing polybenzimidazole cross-link membranes from functionalized graphene oxide. The polybenzimidazole cross-link membranes comprise polybenzimidazole homopolymers, modified graphene oxide and phosphoric acid. The method has the advantages that binary acid and aromatic quaternary amine are used as monomer raw materials, polyphosphoric acid is used as a reaction medium, reaction is carried out at the temperature of 150-220 DEG C under the condition of nitrogen protection for 5-30 h to obtain the polybenzimidazole homopolymers, and the prepared polybenzimidazole homopolymers in solvents such as dimethyl sulfoxide, N, N-dimethylacetamide, phosphoric acid, sulfuric acid and methylsulfonic acid are excellent in dissolubility; graphene oxide (GO) powderis prepared by the aid of improved Hummers processes, and graphene oxide is modified by the aid of silane coupling agents (KH560) to obtain the functionalized graphene oxide (KH560-GO); the prepared functionalized graphene oxide (KH560-GO) is used as a cross-linking agent, and the polybenzimidazole cross-link membranes with excellent mechanical performance and methanol diffusion resistance can beprepared by the aid of cross-linking reaction between imidazole rings in the prepared polybenzimidazole homopolymers and epoxy functional groups in the functionalized graphene oxide (KH560-GO); cross-link membranes can be ultimately soaked in phosphoric acid solution (with the concentration of 50-85%) for 6-24 h to obtain the polybenzimidazole cross-link membranes with low phosphoric acid doping,and service requirements in the field of high-temperature fuel cells, sensors and the like can be met.

The present invention involves the design of a radiation curable organic pre polymer resin material based on urethane acrylic linkage synthesized from the natural renewable resource cardanol or a derivative thereof, for coating application. These new molecules have a faster and better curing rate compared to the starting renewable resource—cardanol. This is brought about by the hydrogen bonding of the urethane linkage which leads to a pre organization of the molecules in such a way as to bring the cross linkable double bonds closer to each other. The present invention also involves a UV curable formulation of the above mentioned resins along with 2-10 parts by weight of a photopolymerization initiator. The resin, either in a formulation or alone turns into a cross linked film upon photopolymerization in presence of photoinitiator under a UV curable radiation source like a mercury vapor pressure lamp.

A film-forming composition comprises a solvent and unimolecular nanoparticles of a self-crosslinkable nanogel star polymer. The nanogel star polymer comprises i) a crosslinked polymer core (nanogel core) and ii) 6 or more independent polymer arms covalently linked to the core by respective first end groups. A plurality of the arms comprise reactive groups for effecting crosslinking of the nanoparticles. An essentially solvent-free film layer comprising the nanoparticles self-crosslinks, optionally assisted by subjecting the film layer to a thermal treatment and / or a photochemical treatment. A surface treated article comprising the crosslinked film layer can effectively inhibit growth of and / or kill Gram-negative microbes, Gram-positive microbes, fungi, and / or yeasts.

The invention specifically relates to a cross-linked polybenzimidazole basic anion exchange membrane, and preparation and application thereof, belonging to basic anion exchange membrane fuel cells. The method comprises the following steps: synthesis of N1-long-chain alkane substituted-1,4-diazabicyclo[2.2.2]octane; and preparation of the N1-long-chain alkane substituted-1,4-diazabicyclo[2.2.2]octane functionalized polybenzimidazole-polyvinylbenzyl chloride cross-linked basic anion exchange membrane. According to the invention, the cross-linked anion exchange membrane is prepared by using a homogeneous method, and cross-linking and quaternization are completed in one step, so operation is simple and efficient, and the mechanical strength and dimensional stability of the cross-linked membrane are improved; a homogeneous reaction adopted in the process of preparation effectively improves the efficiency of quaternization, and a microscopic phase separation structure in the membrane allowsthe cross-linked membrane to have higher conductivity; and the cross-linked polybenzimidazole basic anion exchange membrane has the advantages of excellent dimensional stability, chemical stability and the like, and has potential application prospects in basic anion exchange membrane fuel cells.

A novel method of nucleic acid hybridization placing immobilized nucleic acid at the lower end of a temperature gradient to achieve more efficient and more completed hybridization. Immobilized nucleic acids such as DNA array or cross-linked membrane for Northern blotting is anchored on a surface with a heat sink, while within the same hybridization chamber a heat source is place the furthest possible distance away from the array or membrane. The invention also teaches different ways to construct such a hybridization chamber and additional optional improvement features.

The invention discloses a cross-linked poly(triazole) ion liquid / polybenzimidazole high-temperature proton exchange membrane and a preparation method thereof. The cross-linked membrane adopts polybenzimidazole as a polymer skeleton, adopts triazole ion liquid-based polyethylene as a cross-linking agent, and the cross-linked high-temperature proton exchange membrane is formed by virtue of self cross linking. The cross-linked poly(triazole) ion liquid / polybenzimidazole high-temperature proton exchange membrane proposed by the invention has good proton electric conductivity and excellent size stability in a case of not increasing the humidity, and the weaknesses of the polybenzimidazole / phosphate high-temperature membrane such as unstable electric conductivity caused by the loss of phosphoric acid can be effectively avoided. The cross-linked poly(triazole) ion liquid / polybenzimidazole high-temperature proton exchange membrane has the advantages of high electric conductivity, low air permeability and the like. The cross-linked poly(triazole) ion liquid / polybenzimidazole high-temperature proton exchange membrane proposed by the invention can be applied to a high-temperature proton exchange membrane fuel cell, a direct alcohol fuel cell, an electrochemical sensor or other electrochemical apparatuses.

The invention provides a preparation method of an anion-exchange membrane with a univalence and multivalence selective separation function. The preparation method comprises the following steps: (1) preparing a PSS (sodium polystyrene sulfonate) / NaCl mixed solution and an HACC (chitosan quaternary ammonium salt) / NaCl mixed solution; (2) putting an anion-exchange membrane into an electrolytic deposition device; depositing PSS on the surface of the anion-exchange membrane; after immersing with pure water, depositing HACC on the surface of a PSS layer; continuously and alternately depositing to obtain a polyelectrolyte multilayered modified layer on the surface of the anion-exchange membrane; (3) preparing a DAS (4,4'-diazidodistyryl-2,2'-sodium disulfonate) solution; (4) immersing the polyelectrolyte multilayer modified layer into the DAS solution to enable DAS to permeate into a polyelectrolyte multilayer; (5) carrying out ultraviolet irradiation on the modified layer to enable the DAS, the polyelectrolyte multilayer and the surface of the membrane to be subjected to cross linking, so as to form a stable cross-linking modified layer; and (6) immersing the cross-linked membrane into a NaCl solution to remove DAS molecules, so as to obtain the anion-exchange membrane with the univalence and multivalence selective separation function. The anion-exchange membrane prepared by the preparation method has very good univalence selective separation function and stability.

The invention discloses a cross-linking type polybenzimidazole / silicon dioxide high-temperature proton exchange membrane with high oxidation resistance and a preparation method thereof. The cross-linking membrane takes free radical quencher-containing porous polybenzimidazole as a substrate; pores are filled with polybenzimidazole and organosilicone cross-linking resin. The cross-linking type polybenzimidazole / silicon dioxide high-temperature proton exchange membrane with the high oxidation resistance provided by the invention has good proton conducting capacity and excellent oxidation resistance without humidifying, and the problem about swelling after the polybenzimidazole is immersed into phosphoric acid is effectively solved. The cross-linking type polybenzimidazole / silicon dioxide high-temperature proton exchange membrane with the high oxidation resistance provided by the invention can be applied to a high-temperature proton exchange membrane fuel cell, a direct alcohols fuel cell, an electrochemical sensor and other electrochemical devices to serve as a proton exchange membrane.

The invention relates to a preparation method for microcapsules with magnetic nanoparticles-containing capsule walls. The microcapsules are medicine-carried microcapsules which take cross-linked films of sulfydryl-containing amino acid or peptide-modified magnetic nanoparticles as capsule walls and take an oil phase loaded with hydrophobic medicines as a core material. According to the preparation method, the magnetic nanoparticles are directly loaded on the capsule walls of the microcapsules, so that the agglomeration of the magnetic nanoparticles is avoided; the magnetic nanoparticles are uniformly distributed on the capsule walls of the microcapsules, so that the contact between the magnetic nanoparticles and the medicines loaded in capsule cores is reduced to the maximum; therefore, the influence on the medicine effect and the targeting caused by the magnetic nanoparticles is reduced; the controllable targeting transmission of the medicines is realized by utilizing the magnetic targeting of the magnetic nanoparticles; the controllable targeting release of the medicines is realized by utilizing the reduction responsiveness of disulfide bonds; the preparation method is easy to operate, efficient and quick, and moreover, impurities are not easily introduced.

The invention discloses a bionic micro-nano laminated hydrophobic biological valve and a preparation method thereof. The hydrophobic biological valve is formed by constructing a bionic micro-nano laminated compound network structure on the pericardium surface after cross-linking fixation through a layer-by-layer superposition mode, so that the contact angle of the surface of the valve is 90-145 degrees. The number of bionic micro-nano laminated compound laminations on the surface of the valve is 1-5, wherein a hydrophobic network topology basic framework is constructed on the surface and innerportion of the valve in the first layer; a stable network topology structure required by hydrophobicity is formed in the second layer, the third layer, the fourth layer and the fifth layer. The hydrophobic biological valve has obvious anticoagulation and anti-adhesion properties, and can effectively reduce the formation of thrombi and calcified spots; since the multilayer structure of the hydrophobic biological valve is hydrophobic high-molecular polymer mixed cross-linking membrane layers from inside to outside, the formed hydrophobic structure has long-term stability under the blood environment in the body.

The invention discloses a composite lignin nanofiltration membrane and a preparation method thereof. The preparation method comprises the following steps: (1) mixing lignin, polyether imide and an organic solvent, carrying out stirring at 25 to 60 DEG C, then carrying out standing and defoaming at 6 to 25 DEG C so as to prepare a membrane casting liquid, smearing a smooth surface of a non-woven fabric with the membrane casting liquid, standing the non-woven fabric, then placing the non-woven fabric into deionized water for soaking, taking the non-woven fabric out and drying moisture through absorption so as to obtain a base membrane, wherein the smooth surface of the non-woven fabric with the smeared membrane casting liquid is called as surface A; (2) immersing the surface A in a methanol solution of ethene diamine, carrying out soaking, taking the surface A out and washing the surface A with deionized water so as to obtain a cross-linked membrane; and (3) soaking the surface A of the cross-linked membrane in an aqueous solution of m-phenylenediamine, taking the surface A of the cross-linked membrane out, draining moisture through absorption, then soaking the surface A in a hexane solution of trimesoyl chloride, taking the surface A out and carrying out air drying so as to obtain the composite lignin nanofiltration membrane. The preparation method has the advantages of usage of cheap and easily available raw materials, simple process and rapid reaction; and the obtained composite lignin nanofiltration membrane has high flux and high separation selectivity.

A high-temperature-resistant composite proton exchange membrane is formed by compositing polybenzimidazole and an aromatic polymer with benzyl halide in side chains to form a composite cross-linking membrane and impregnating the composite cross-linking membrane in phosphoric acid. The mass fraction of the heterocyclic aromatic polymer containing benzyl halide in the composite cross-linking membrane is 0.01-99.99wt%. The mass fraction of the phosphoric acid doped in the composite proton exchange membrane is 1-99%. Compared with the existing phosphoric acid doped high-temperature proton exchangemembrane, the high-temperature-resistant composite proton exchange membrane of the invention has the advantages as follows: the glass transition temperature of the aromatic polymer with benzyl halidein side chains is high, which ensures the stability of the composite proton exchange membrane at high temperature; and each molecular chain contains multiple benzyl bromide groups and forms a covalent bond with multiple polybenzimidazole molecular chains, which improves the dimensional stability of the composite membrane; the composite proton exchange membrane has a high phosphoric acid doping level and good mechanical performance, and is a high-temperature proton exchange membrane with excellent comprehensive performance; and the preparation method is simple, and the composite proton exchange membrane has wide applications and is convenient for large-scale production.

The invention provides a method for improving the color fastness of acid fluorescent dyes. The method includes the following steps: (1) a fabric dyed with the acid fluorescent dyes is provided; (2) first-time color fixing processing is carried out on the dyed fabric with an acid dye-fixing agent; (3) second-time color fixing processing is carried out on the dyed fabric with the acid dye-fixing agent. The method has the advantages that all steps are executed under the acid conditions, and two times of color fixing are continuously carried out with the acid dye-fixing agent. The dyes and the fabric can be bridged through the acid dye-fixing agent to form a compound; in other words, the acid dye-fixing agent can be in cross-linking reaction with -NH2 on the fabric while being bonded with dye molecules, cross-linking membrane formation can be carried out on the acid dye-fixing agent to form the high diversification cross-linked polymeric membrane of a cubic net structure, and the surface of the fabric is covered with the polymeric membrane, so that the dyes and the fabric are combined together more tightly and firmly, the dyes are effectively prevented from dropping from the fabric, and the color fastness of the acid fluorescent dyes is improved.

The invention discloses a high-strength alkaline anionic polymer cross-linked membrane and a preparation method thereof. The preparation method comprises the following steps: firstly, synthesizing polymers with different functional group side chains; respectively dissolving the obtained modified polymer in an organic solvent to prepare a membrane solution with a certain concentration; and finally, fully mixing the two membrane solutions under a normal temperature condition to obtain a uniform mixed membrane solution, and placing the uniform mixed membrane solution under a proper high-temperature condition to perform thermal crosslinking membrane formation so as to obtain the high-strength alkaline anionic polymer crosslinked membrane. The alkaline anionic polymer membrane with high mechanical strength is obtained by adopting an indirect cross-linking method, and the alkaline anionic polymer cross-linked membrane obtained by adopting an indirect chemical cross-linking method has high mechanical strength and excellent dimensional stability. The alkaline anionic polymer cross-linked membrane has excellent physical and chemical properties, so that the alkaline anionic polymer cross-linked membrane has good cell performance when being applied to an alkaline polymer membrane fuel cell.

The invention belongs to the technical field of waste water treatment, and provides a cation exchange membrane for electrodialytic treatment and a preparation method thereof. The preparation method comprises the following steps: adding biological vermiculite powder into sodium alginate colloid, coating, drying to form a film, using iron chloride solution as a cross-linking agent, enabling sodium alginate to form a cross-linked membrane, removing iron ions by in a washing manner, and preparing the cation exchange membrane for the electrodialytic treatment of the ammonium and nitrogen waste water. Compared with the traditional method, the cation exchange membrane prepared by the invention is high in ammonium and nitrogen removal rate and longer in time for reaching the adsorption saturation,can be synergistic with microorganisms in the ammonium and nitrogen waste water comprising the microorganisms to realize the regenerative circulation, and the cation exchange membrane is high in ammonium and nitrogen desorption rate when in recycling, and recyclable. After being used for a long time and circularly, the membrane can still maintain a higher removal efficiency and mechanical performance and is long in service life.

The invention relates to a microcapsule containing functionalized graphene in a capsule wall and a preparation method of the microcapsule. In the microcapsule, a crosslinked membrane of sulfhydrylized graphene obtained by modifying a compound which simultaneously contains sulfhydryl and amino or bio-molecules is used as the capsule wall, and an oil phase which is loaded with hydrophobic drugs is used as a core material. The preparation method is achieved by ultrasonically radiating a water solution containing the sulfhydrylized graphene and the oil phase which is loaded with the hydrophobic drugs so as to obtain the microcapsule which contains the functionalized graphene in the capsule wall. The microcapsule disclosed by the invention is capable of achieving the controlled release of the drugs on the basis of the reducing responsiveness of a disulfide bond; and the preparation method is simple to operate, efficient and rapid and high in drug loading capacity, and the preparation method is not easy to introduce impurities, widely applicable to the cladding of the hydrophobic drugs and excellent in application prospect.

The invention discloses a solvent-resistant composite nanofiltration membrane and a preparing method. The preparing method comprises the steps that firstly, polyetherimide and an organic solvent are mixed and stirred at 35-80 DEG C, then standing is carried out at 6-25 DEG C for defoaming, a membrane casting solution is obtained and spread on non-woven fabric, the non-woven fabric is put in air, soaked with deionized water and taken out, moisture on the surface is absorbed with filter paper, and a base membrane is obtained, wherein the face, with the membrane casting solution spread, of the non-woven fabric is called a face A; secondly, the face A of the base membrane is soaked in an ethylenediamine methanol solution, taken out and washed with deionized water, and a cross-linked membrane is obtained; thirdly, the face A of the cross-linked membrane is soaked in an ammonium lignosulfonate aqueous solution and taken out, then the face A is soaked in a trimesoyl chloride n-hexane solution, taken out and air-dried, and the solvent-resistant composite nanofiltration membrane is obtained. The solvent-resistant composite nanofiltration membrane and the preparing method are low in cost, the method is simple, and a reaction is quick; the obtained solvent-resistant composite nanofiltration membrane has high separation selectivity and solvent tolerance.