127 results about "Interfacial polymerization" patented technology

The application discloses a biomimetic urchin-shaped asymmetric structure composite phase change chitosan aerogel loaded with TiO2 / rGO heterojunction and a preparation method and application thereof, adopts argon plasma etching GO, step-by-step dropwise adding tetrabutyl titanate to prepare TiO2 / rGO heterojunction; prepares a multi-level structure phase change microcapsule by an interfacial polymerization method; mixes the heterojunction with a chitosan solution, and prepares a biomimetic urchin-shaped asymmetric chitosan aerogel framework through a customized asymmetric mold and a unidirectional freezing process; fixes the phase change microcapsule by a vacuum-assisted impregnation method, and then performs in-situ coating through polydopamine to obtain the biomimetic urchin-shaped asymmetric structure composite phase change chitosan aerogel loaded with TiO2 / rGO heterojunction, the removal rate of VOCs of the biomimetic urchin-shaped asymmetric structure composite phase change chitosan aerogel loaded with TiO2 / rGO heterojunction is greater than or equal to 80% at low temperature, the phase change microcapsule dispersion rate is less than or equal to 3% after 100 cycles, the structural stability and the cycle durability are excellent, and the biomimetic urchin-shaped asymmetric structure composite phase change chitosan aerogel loaded with TiO2 / rGO heterojunction is suitable for efficient purification of VOCs in low-temperature closed scenes such as cold chain workshops and indoor environments in winter.

Disclosed is a core-shell microcapsule comprising a core containing at least one active ingredient, and comprising a shell, said shell constituting a wall around the core and representing a mass fraction of at least 20% of the total mass of the microcapsule, said microcapsule being characterized in that the shell comprises at least one crosslinked polymer, preferably obtained by interfacial polymerization. The size of the microcapsules is preferably less than 1 μm. The active ingredient can be a sunscreen.

The application discloses a selective anion exchange membrane for separating nitrogen and phosphorus ions in water and a preparation method thereof. A solution of polyamine monomers, anion functional group-containing amine monomers and dopamine is blended on the surface of a commercial anion exchange membrane to form a deposition layer of negatively charged polydopamine nanoparticles loaded with polyamine monomers, and then a selective anion exchange membrane is obtained through nano-limit interface polymerization. The preparation method is simple, controllable and easy to scale up, and the obtained membrane has excellent anion separation selectivity, and has a good application prospect for effectively separating and concentrating nitrogen and phosphorus ions in water.

This invention relates to the field of nanofiltration membrane technology, and more particularly to a crown ether-modified positively charged polyamide / carbon nanotube nanofiltration membrane, its preparation method, and its applications. The nanofiltration membrane is constructed by attaching a carbon nanotube interlayer to a substrate membrane, followed by the preparation of a crown ether-modified polyamide membrane layer on the carbon nanotube layer via interfacial polymerization. Further, positively charged molecules are grafted onto the membrane surface, resulting in a composite functional structure where the surface exhibits the positive charge of the grafted molecules, the internal lithium-ion recognition properties of the crown ether, and the conductivity of the carbon nanotubes at the bottom. The positively charged layer of this nanofiltration membrane possesses a strong size sieving effect and Donan repulsion effect for positively charged divalent magnesium ions, while the crown ether provides a dedicated channel for lithium ions, enabling rapid lithium-ion transport under electro-driven conditions. This endows the nanofiltration membrane with the characteristic of simultaneously "intercepting magnesium ions and allowing lithium ions to pass through," thereby achieving highly efficient lithium-magnesium separation applications.

This invention discloses a microcapsule, its preparation method, and its applications, belonging to the field of bioprotective materials. The microcapsule has a tertiary spherical or near-spherical particle structure, including a core layer, a shell layer covering the core layer, and satellite layers anchored to the outer surface of the shell layer. The core layer includes an active ingredient and a hydrophobic carrier medium. The shell layer is a cross-linked polyurethane-polyurea wall material formed by interfacial polymerization of polyisocyanate and polyols or polyamines containing hydrophilic segments. The satellite layers include active units and bridging and stabilizing units. The active units include benzalkonium chloride or benzyl chloride. The satellite layers exist in the form of nanoparticles or molecular clusters with a size of 10-150 nm. This invention, applied to bioprotective materials, solves the problem of efficient co-loading and intelligent sequential release of multipolar active substances in existing microcapsules. It possesses antiviral, antibacterial, antifungal, and anti-mite functions, a long service life, and features controllable and reproducible processes.

The application discloses a PSPEEK / COF composite membrane for reverse electrodialysis technology and a preparation method thereof, and belongs to the technical field of renewable energy extraction. First, sulfonated polyether ether ketone material is synthesized by using ether ether ketone and concentrated sulfuric acid, then a porous sulfonated polyether ether ketone casting solution is prepared by adding a solvent and polyethylene glycol 400, then a COF membrane is formed above the PSPEEK casting solution by using an interfacial polymerization method, finally, the PSPEEK / COF composite membrane is obtained by removing the solvent and polyethylene glycol 400. The COF membrane with inherent pore transmission channels is prepared first, and the COF membrane is used for selectively conducting cations. The mechanical stability of the COF membrane is improved by combining the COF membrane with the PSPEEK substrate. The prepared membrane has high salt difference power generation performance and long service life.

The application provides a preparation method of a polyamide reverse osmosis membrane, comprising the following steps: (1) immersing a non-woven fabric supported ultrafiltration membrane into an aqueous phase solution, and removing the excess aqueous phase solution on the surface of the ultrafiltration membrane after taking out; (2) immersing the ultrafiltration membrane obtained in the step (1) into an oil phase solution to perform interfacial polymerization, and then removing the excess oil phase solution on the surface of the ultrafiltration membrane; (3) coating an alcohol solution containing dansyl on the surface of the membrane obtained in the step (2), performing heat treatment, cleaning with hot water after the reaction is completed, and obtaining the reverse osmosis membrane. The amino group in dansyl reacts with acyl chloride and is grafted in the polyamide network. The tertiary amine in dansyl accepts protons in an acidic solution and shows hydrophilicity, which improves the hydration water content of the polyamide and the stability of the polyamide structure. The naphthalene group in dansyl occurs hydrophobic aggregation in an alkaline solution, which reduces the size and polarity of the polyamide hole, so that the polyamide reverse osmosis membrane with acid and alkali resistance and high boron removal is prepared.

This invention provides the application of adamantane-1,3-diamine in the preparation of reverse osmosis membranes with controllable desalination performance, the reverse osmosis membrane itself, its preparation method, and its application, relating to the field of reverse osmosis membrane preparation. The controllable desalination performance reverse osmosis membrane includes a polysulfone ultrafiltration membrane and a polyamide layer disposed on the surface of the polysulfone ultrafiltration membrane; wherein the polyamide layer is formed by interfacial polymerization of an aqueous amine solution and an organic acyl chloride solution followed by heat treatment and curing; and the aqueous amine solution contains adamantane-1,3-diamine. This invention, by adding adamantane-1,3-diamine, prepares a series of SWRO membranes with similar surface morphology and permeate flux, but different desalination performances. This allows for flexible fulfillment of diverse application requirements without altering existing permeate processes and membrane cleaning processes, improving the overall efficiency and economy of the system.

This invention relates to the technical field of membrane separation materials, and discloses a method for preparing a high-concentration SD membrane with high throughput, controllable desalination rate and excellent operational stability, as well as the high-concentration SD membrane itself. The preparation method includes the following steps: (1) adding a polymer to an organic solvent under heating and stirring to obtain a mixture; (2) cooling the mixture and then adding a pore-forming agent and a hydrophobic modifier to obtain a precursor solution; (3) performing vacuum degassing treatment on the precursor solution to obtain a casting solution; coating the casting solution onto a carrier and then performing a gel bath treatment to obtain a base membrane; (4) sequentially immersing the base membrane in an aqueous solution and an oil solution for polyamide treatment to obtain a precursor membrane; wherein, the aqueous solution includes an interfacial polymerized amine monomer and a macromolecular occupier that does not participate in the interfacial polymerization reaction; the oil solution includes an interfacial polymerized acyl chloride monomer; (5) removing the macromolecular occupier to obtain the high-concentration SD membrane.

The application discloses a preparation method and application of a double-layer COF composite membrane and belongs to the technical field of gas separation membranes. The double-layer COF composite membrane is prepared by the following steps: taking a porous polymer membrane as a support layer, depositing macroporous TpBD-2SO3H nanosheets on the surface of the base membrane through vacuum suction filtration, and interfacially polymerizing a microporous ACOF-1 layer. The application induces ACOF-1 to be generated on the surface of the TpBD-2SO3H nanosheets through electrostatic interaction between the TpBD-2SO3H nanosheets and amine monomers, and a dense and defect-free composite membrane is obtained, which exhibits excellent H2 / CO2 separation performance. The method is ingeniously designed, and the double-layer COF composite membrane prepared by the method has important application potential in the field of H2 separation.

The application discloses application of a nanofiltration membrane based on carbon nitride photo-generated positive charge regulation in lithium-magnesium separation performance, and belongs to the technical field of membrane separation and water treatment. When the nanofiltration membrane is used for lithium-magnesium separation, the application is carried out under light irradiation. The nanofiltration membrane is prepared by the following steps: (1) preparing a carbon nitride membrane sol; adding the carbon nitride membrane sol into an aqueous solution of a polyamine monomer to obtain a mixed dispersion; (2) preparing an organic phase monomer solution; (3) adding an ultrafiltration support base membrane into the mixed dispersion, taking out the ultrafiltration support base membrane and adding it into the organic phase monomer solution, and carrying out interfacial polymerization to obtain a high-permeability membrane; and (4) carrying out heat treatment on the high-permeability membrane to obtain the nanofiltration membrane. In the process of preparing the membrane, the functionalized carbon nitride is introduced, and visible light is added in the application, so that a large number of positive charges are formed on the surface of the carbon nitride, the surface of the nanofiltration membrane is further positively charged, the Donnan effect of the nanofiltration membrane is strengthened, and the selectivity of magnesium ions and the lithium-magnesium separation efficiency are improved.

This invention relates to the field of water treatment membrane technology, and more particularly to a reverse osmosis membrane, its preparation method, and its application. The reverse osmosis membrane comprises a nonwoven fabric layer, a support layer, and a polyamide separation layer sequentially laminated together; the polyamide separation layer is formed by an interfacial polymerization reaction of an aqueous phase solution and an oil phase solution on the support layer; the aqueous phase solution comprises amine monomers, a eutectic solvent, and a covalent organic framework material; the oil phase solution comprises acyl chloride monomers. The reverse osmosis membrane provided by this invention exhibits superior antifouling, alkali resistance, and oxidation resistance.

The application belongs to the technical field of phase change microcapsule energy storage materials, and is characterized by using polyurethane urea as a shell material, normal alkane as a core material, and a mixture of crystalline resin and multi-dimensional inorganic nanomaterial as a complex nucleating agent, and using an interfacial polymerization method to obtain low supercooling degree formaldehyde-free phase change microcapsules, wherein the total mass of the nucleating agent accounts for 0.1-0.5% of the mass of the core material. The method is simple and low in cost. The phase change microcapsule material prepared by the method can still maintain a low supercooling degree and does not have a phase separation phenomenon after long-term heat absorption and heat release cycles, is suitable for long-term cold and heat cycles, and has a broad development prospect in the fields of textiles, buildings and industrial waste heat recovery.

The application discloses a method for preparing an antibacterial nanofiltration membrane by using amikacin as a water-phase monomer, and belongs to the technical field of composite nanofiltration membrane preparation. The method uses amikacin as a water-phase monomer and adopts an interfacial polymerization method to prepare an antibacterial nanofiltration membrane (polyamide nanofiltration membrane). The method has the advantages of simple operation, mild reaction conditions and relatively low raw material cost. In addition, the prepared polyamide composite nanofiltration membrane has higher selective permeation performance and good antibacterial performance. The nanofiltration membrane flux can be as high as 20 L / (m 2 ·h·bar), and the tetracycline rejection rate can be as high as 99.3%. In addition, the application can also provide a reference for the preparation of other antibacterial interfacial polymerization separation membranes.

This invention relates to the field of seawater desalination technology, specifically to a high-permeability and selective reverse osmosis membrane and its preparation method. The high-permeability and selective reverse osmosis membrane is obtained by sequentially immersing a porous support layer in an aqueous solution and an oil solution for interfacial polymerization, thereby forming a desalination layer on the surface of the porous support layer. This invention increases the compatibility of the water / oil phases by adding N-methylpyrrolidone to the aqueous phase and methyl benzoate to the oil phase, thereby reducing the surface tension of the two phase solutions, promoting the diffusion of amine monomers into the organic phase, and altering the surface morphology and polymer chain aggregation state of the separation layer. This results in a higher roughness and cross-linking degree of the desalination layer, and improved permeability and selectivity.

The application discloses a methoxy type covalent organic framework composite film and a preparation method and application thereof. The preparation method of the methoxy type covalent organic framework composite film comprises the following steps: (1) preparing an oil phase: weighing aldehyde monomers and amine monomers, adding the aldehyde monomers and the amine monomers into an organic solvent, and making the aldehyde monomers and the amine monomers completely dissolved to obtain the oil phase; (2) preparing a water phase: the water phase is an acetic acid aqueous solution; and (3) obtaining the methoxy type covalent organic framework composite film through an interfacial polymerization method. The application provides application of the methoxy type covalent organic framework composite film in organic matter filtration and organic matter selective screening, and the methoxy type covalent organic framework composite film has low cost, small energy consumption and high separation efficiency.

This invention relates to the field of microencapsulation technology, and more specifically, to an organic-inorganic hybrid sustained-release fragrance microcapsule and its preparation method. By weight percentage, the components include: 10-35% fragrance oil, 1-10% silane precursor, 0.01-2% silane coupling agent, 1-15% polyisocyanate, 0.01-10% emulsifier, 0.01-10% polyamine compound, and deionized water to make up the balance. Through the combination of sol-gel and interfacial polymerization methods, the stability of the fragrance is improved, making it less prone to volatilization or decomposition during long-term storage or under different environments, effectively preventing direct contact between the fragrance and air, thereby prolonging the duration of the aroma. During use, the organic-inorganic hybrid fragrance microcapsule releases active substances through sustained release, reducing environmental pollution and diffusion.

This invention discloses a method for preparing a composite nanofiltration membrane modified with molybdenum disulfide quantum dots and its application, belonging to the field of modified nanofiltration membrane preparation. The preparation method is as follows: based on the traditional interfacial polymerization method for preparing nanofiltration membranes, hydrophilic molybdenum disulfide quantum dots are added to the aqueous monomer, and the addition ratio of nanomaterials is controlled. Vacuum filtration is used to deposit the nanomaterials onto the surface of the base membrane, resulting in a composite polyamide nanofiltration membrane with a large amount of negative surface charge and strong hydrophilicity in neutral aqueous solution. The prepared composite membrane has a low molecular weight cutoff, significantly reduced calcium and magnesium ion rejection, and a substantial increase in water flux. In practical drinking water treatment projects, it can significantly reduce energy consumption and has broad application prospects.

The application discloses a preparation method of a modified polyamide composite membrane which significantly improves solvent flux, and the method is as follows: dehydrogenated rosin amine and trimesoyl chloride are dissolved in natural turpentine to obtain an oil phase solution, the oil phase solution is added into an aqueous phase solution containing piperazine, an interfacial polymerization reaction occurs at the oil-water interface, a modified polyamide film is formed, and then the obtained film is combined with a porous base film to form a composite membrane. The application realizes nanoscale modification of the polyamide film through interfacial polymerization, the permeation flux of the obtained composite membrane to nonpolar or low-polar solvents can be improved by orders of magnitude, the composite membrane is applied to nanofiltration of organic solvents, efficient separation of small molecules in the organic solvents and solvent recovery can be realized, and therefore the composite membrane has great application prospect in separation and purification of organic mixtures in chemical, pharmaceutical and food industries.

This invention belongs to the field of membrane separation technology and discloses an ultrathin composite membrane with an interpenetrating network framework structure, its preparation method, and its application. The preparation method includes: pouring a zirconium metal solution onto the surface of a PSf base membrane, allowing metal ions to adsorb onto the PSf membrane surface; then immersing the other side of the PSf membrane in a ligand solution of 2-aminoterephthalic acid and triethylamine for a coordination reaction; after the reaction is complete, removing the membrane and placing it under suitable temperature and humidity conditions; as the organic solvent and triethylamine molecules on the membrane surface volatilize, the metal ions and organic ligands on the membrane surface complete heterogeneous nucleation and growth, forming a pure MOF membrane; finally, based on the amino group carried by the selected UiO-66-NH2, immersing an organic monomer solution onto the surface of the prepared MOF membrane, allowing interfacial polymerization reactions to occur on the MOF membrane surface and within the crystallites, thereby obtaining an ultrathin composite membrane with an interpenetrating network framework structure, which can be applied in the fields of CH4 / N2 separation and dye / salt separation.

The application relates to the technical field of polyamide composite membrane preparation, and relates to a polyamide composite membrane preparation method and application of the composite membrane. A kind of polyamide composite membrane with good selectivity and permeability is prepared by synthesizing a kind of triamino quaternary ammonium salt monomer to participate in PEI / TMC interfacial polymerization process, which can efficiently separate magnesium ions and lithium ions in water. The novel polyamide composite nanofiltration membrane prepared by the application has a relatively dense and smooth surface morphology, and the PA layer has a small thickness. In a long-time filtration experiment, the membrane flux and retention rate are excellent and stable.

This invention relates to an acid-resistant electro-driven thin film for electro-driven separation, its preparation method, and its application. The preparation method includes the following steps: (1) Base film activation: The base film is activated sequentially with water, alkaline solution, and acid solution to obtain an activated base film; (2) Interfacial polymerization reaction: The activated base film is sequentially immersed in an aqueous phase solution and an organic phase solution, and then subjected to heat treatment to obtain the acid-resistant electro-driven thin film; The aqueous phase solution includes a polyamine compound; The organic phase solution includes an organic solvent and an organic monomer, The organic monomer includes cyanuric chloride and terephthalic diisocyanate. This invention obtains an acid-resistant electro-driven thin film with excellent conductivity and acid resistance and a reasonable pore structure by combining the base film activation process with the interfacial polymerization reaction of polyamine compounds in the aqueous phase solution and cyanuric chloride and terephthalic diisocyanate in the organic phase solution. This enables efficient separation between ions under acidic and electro-driven conditions.

The application belongs to the technical field of membrane separation, and discloses a Ti3C2T x MXene quantum dot composite polyamide reverse osmosis membrane preparation method, first, Ti3C2T x MXene material is subjected to liquid nitrogen intercalation treatment and interlayer expansion, and Ti3C2T x MXene quantum dot nanomaterial; then, Ti3C2T x MXene quantum dot nanomaterial is prepared; the polyamine aqueous solution and the polyacyl chloride solution; the ultrafiltration base film is soaked in the water-phase monomer solution, the water-phase monomer solution on the film surface is blown dry; then, the base film is immersed into the organic-phase solution, interface polymerization reaction occurs, and an active layer is formed; the composite film after interface polymerization is placed and subjected to heating treatment, and interface polymerization reaction is further promoted to occur. The preparation process is simple, the prepared reverse osmosis membrane has good membrane performance, that is, has higher water flux and better anti-pollution performance.

This invention discloses a desalination membrane, its preparation method, and its application, relating to the field of chemical separation technology. It provides a novel strategy for preparing a new antibiotic desalination membrane based on an interfacial polymerization process controlled by amino-rich monomers. The separation membrane is composed of a polymer membrane support layer and a continuous polyamide selective layer. The polymer membrane is an ultrafiltration membrane with a pore size between 0.05 and 0.15 μm. The separation membrane is formed by placing a polymer membrane impregnated with an aqueous solution of amino-rich monomers at the bottom of a reactor, and then placing an oil-phase solution of acyl chloride monomers at the top of the polymer membrane, allowing the amino-rich monomers and acyl chloride monomers to react and form a membrane at the water-oil interface. The amino-rich monomers have an aromatic framework structure and abundant amino groups; they possess good and stable water solubility; they can be prepared in a short time and have a high degree of crosslinking. The separation membrane of this invention can achieve rapid and efficient separation of different antibiotic molecules from salts.

The application discloses a kind of high-efficiency interception polyvalent anion and cation nanofiltration membrane and its preparation method and application.The method includes the following preparation process:1) preparation concentration is 0.1-2wt% of apigenin class of substance aqueous solution, and concentration is 0.1-0.5wt% of multi-acid chloride organic phase solution;2) make polymer support membrane in aqueous solution 1-5min, remove the surface excess solution, then immerse into oil phase solution, react 1-15min;3) after reaction, remove the surface excess solution, solidify 5-20min under 60-80 DEG C, obtain the nanofiltration membrane.The application is with apigenin, apigenin-7-o-glucuronide and / or isofraxidin as aqueous monomer, and multi-acid chloride is prepared by interfacial polymerization reaction to obtain negative NF membrane, not only maintain the high interception rate to polyvalent anion, and also have very high interception rate to polyvalent cation, can efficiently permeate monovalent ion, and water flux is larger.

The present application relates to a kind of anti-pollution temperature-sensitive polyamide nanofiltration membrane and its preparation method;Including polysulfone base film and the polyamide active separation layer formed on it by interfacial polymerization, polyamide active separation layer surface is covalently grafted with a layer of copolymer brush, copolymer brush is formed by the random copolymerization of zwitterionic monomer structural unit and temperature-sensitive monomer structural unit by ultraviolet light initiation. By ultraviolet light initiation grafting technology, sulfobetaine methacrylate and N-isopropyl acrylamide are copolymerized on the same membrane surface, realize the synergistic effect of the strong hydration and antibacterial properties of zwitterionic polymer and the intelligent conformational transition ability of temperature-sensitive polymer. In the anti-bovine serum albumin pollution test, the flux decline rate after pollution is only 20.41%, and the flux recovery rate after 40 DEG C warm water cleaning is as high as 93.02%;After being treated in 1000 mg / L sodium hypochlorite solution for 4 hours, the water flux changes only by 17.22%, and the rejection rate changes only by 0.21%, ensuring the durability of membrane performance.