18 results about "Hydrogel membrane" patented technology

This invention discloses an aramid 1414-based aerogel membrane material for oily wastewater separation, its preparation method, and its applications. The membrane material comprises a superhydrophilic electrospun substrate membrane and aramid 1414 nanofibers loaded on the surface and internal pores of the substrate membrane. The aramid 1414 nanofibers are filled by negative pressure filtration and then freeze-dried to form an aerogel structure. The preparation method includes: preparing a superhydrophilic electrospun substrate membrane; preparing a nanofiber dispersion of aramid 1414 and polyacrylonitrile; loading the aramid 1414 nanofibers onto the substrate membrane by negative pressure filtration to form a hydrogel membrane; and freeze-drying the hydrogel membrane. This invention achieves highly efficient separation of submicron-sized emulsified oil by filling the electrospun substrate membrane with aramid 1414 nanofibers to form a submicron-sized pore structure, achieving a separation efficiency of up to 99.10%. The preparation process is simple and cost-controllable, showing promising application prospects in the field of oily wastewater treatment.

The application discloses a preparation method and application of a poly-amidoxime semi-interpenetrating network hydrogel membrane, and belongs to the technical field of heavy metal removal. The agarose hydrogel material is used as a base and a crosslinking material, and the self-prepared poly-amidoxime is used as a functional monomer, so that the poly-amidoxime semi-interpenetrating agarose hydrogel membrane is prepared by using a one-step method through temperature control. The preparation method is simple, the conditions are mild, the cost is low, and the poly-amidoxime is uniformly loaded. In addition, the poly-amidoxime semi-interpenetrating agarose hydrogel membrane prepared by the method has high adsorption performance on heavy metal lead, is easy to separate, has no secondary pollution characteristics, and has excellent stability and reusability, and in particular, has little influence on active ingredients in traditional Chinese medicine extract. The poly-amidoxime semi-interpenetrating agarose hydrogel membrane can be used in the fields of heavy metal removal of traditional Chinese medicine extract, various waste water, organic phase heavy metal adsorption and separation.

This invention relates to a method for preparing a biomass-based biodegradable dust suppressant and a spraying device, comprising the following components by weight percentage: 0.78% biomass matrix, 20.7% salt-precipitating solution, and the remainder being an acetic acid solution diluted with deionized water. The specific steps are as follows: adding biomass matrix powder to the acetic acid solution; pouring the salt-precipitating solution powder into the biomass matrix acetic acid solution; magnetically stirring for 30 minutes at 200 r / min and 30°C; and then sonicating for 10 minutes to ensure a complete reaction. This invention combines salt-precipitation with dust suppression technology, using high-concentration salt solutions such as sodium citrate and sodium sulfate. Utilizing the physicochemical interaction between salt ions and biomass material molecules, and through the synergistic effect of salt-precipitation-assisted precipitation and weak ion cross-linking, it breaks the limitations of traditional cross-linking methods, promoting the rapid formation of a three-dimensional network structure, thereby constructing a high-strength hydrogel membrane. This method allows for the simple and convenient preparation of a long-lasting and safe dust suppressant, effectively improving dust suppression efficiency and reducing dust suppression costs.

The invention relates to a drug sustained-release anti-adhesion hydrogel membrane and a preparation method and application thereof.The hydrogel membrane achieves physical adhesion resistance through a matrix of the hydrogel membrane and achieves the anti-hyperplasia effect through continuous release of loaded vitepofen, and the hydrogel membrane and the loaded vitepofen cooperate with each other, so that the clinical problem of two complications of stenosis and adhesion after a cavity pipeline operation is effectively solved.

The invention discloses a chitosan / sodium carboxymethyl cellulose / calcium ion antibacterial composite hydrogel self-supporting membrane as well as a preparation method and application thereof. The composite hydrogel membrane takes nano-hydroxyapatite as a multifunctional calcium source and an adsorption enhancing component, and chitosan and sodium carboxymethyl cellulose are crosslinked through mandelic acid steam to form a dual-network matrix. The hydrogel film prepared by the method has the advantages of large metal ion adsorption capacity, excellent antibacterial property, good mechanical property and the like, and can realize the targets of high-efficiency removal of heavy metal ions in industrial wastewater and low-consumption pollution degradation.

The application relates to a Ca3(PO4)2 crystal reinforced zwitterionic hydrogel membrane and a preparation method and application thereof, the application uses PVDF as a base film, the material is low in price, good in mechanical performance, friendly to the environment and good in recycling performance. Through a polyphenol-metal dual autocatalysis method, a layer of zwitterionic hydrogel is simply and efficiently grafted on the surface of the PVDF film without heating and ultraviolet irradiation. Through a mineralization technology, the zwitterionic hydrogel membrane reinforced by inorganic crystals is used for constructing an inorganic crystal reinforced zwitterionic hydrogel membrane, preparing an oil-water separation membrane which is resistant to pollution, good in mechanical performance and long-term stable and cyclic. The inorganic crystal reinforced zwitterionic hydrogel membrane has the advantages of strong hydration performance and high mechanical stability, has a high separation efficiency on oil-in-water emulsion, shows obvious anti-pollution performance and good cyclic stability. The preparation method is simple, convenient to operate, low in energy consumption, easy to handle and free of secondary pollution, meets the green chemistry concept and has a good application prospect in the field of oil-water separation.

The invention discloses an AMPS-ethylenediaminetetraacetic acid antibacterial composite hydrogel film for removing heavy metal ions in industrial wastewater as well as a preparation method and application of the AMPS-ethylenediaminetetraacetic acid antibacterial composite hydrogel film. According to the composite hydrogel film, carbon felt is used as a reinforcing carrier and a skeleton, 2-acrylamide-2-methylpropanesulfonic acid (AMPS) and ethylenediamine tetraacetic acid are subjected to cross-linking polymerization through polyethylene glycol diacrylate to form a three-dimensional network active matrix, and methacryloyloxyethyl trimethyl ammonium chloride is introduced to provide antibacterial performance. The hydrogel membrane prepared by adopting a cross-linking polymerization-solid solution pouring method has the advantages of large heavy metal ion adsorption capacity, excellent antibacterial property, good mechanical property and the like, and can realize simultaneous and efficient removal of various heavy metal ions such as copper, lead, nickel, cadmium and the like in industrial wastewater and stable operation of the membrane process.

This application discloses a taratin waste residue hydrogel membrane and its preparation method and application. The method includes: S100, pretreating the taratin waste residue and modifying it using an alkali activation method to obtain modified taratin waste residue; S200, preparing a matrix solution using a water-soluble polymer matrix and adding the modified taratin waste residue to the matrix solution, then dispersing and mechanically stirring to obtain a uniform mixture; S300, pouring the mixture into a mold for spreading and allowing it to stand for 24-48 hours to obtain the taratin waste residue hydrogel membrane. This application uses tannic acid in the taratin waste residue as a crosslinking agent, fully utilizing the active groups in the waste residue to form a multi-site hydrogen-bonded complex hydrogel membrane with polymers, thereby improving the mechanical strength and adsorption performance of the hydrogel membrane; the preparation method is simple, green, and mild.

This invention belongs to the field of water treatment membrane material technology, and more specifically relates to a high-strength SA-based hydrogel membrane and its preparation method based on a two-level pore-forming strategy and dual-nano synergistic reinforcement. This invention introduces CNF as a three-dimensional interpenetrating network framework, utilizing its high aspect ratio to construct a "steel bar"-like support structure within the membrane; simultaneously, GO is introduced as a two-dimensional interface enhancer, utilizing the abundant oxygen-containing functional groups in GO sheets to form strong hydrogen bonds between the SA matrix and the CNF framework, solving the problem of weak interfacial bonding between one-dimensional fibers and the polymer matrix. Based on this, this invention employs a two-level pore-forming strategy, utilizing the synergistic occupancy and elution of small-molecule PEG and large-molecule PEG to construct a hierarchical pore structure of macroporous water transport and microporous sieving, breaking the trade-off effect of traditional membrane material flux and retention rate.

The invention discloses a CMC (Carboxymethyl Cellulose) / PVA (Polyvinyl Alcohol) nanofluid hydrogel membrane. The CMC / PVA nanofluid hydrogel membrane is prepared by soaking citric acid cross-linked CMC / PVA hydrogel in a structure promoting ionic salt solution. The invention also provides a method for preparing the CMC / PVA nanofluid hydrogel membrane and application of the CMC / PVA nanofluid hydrogel membrane in osmotic energy conversion. The high-performance nanofluid hydrogel membrane forms a compact dual-crosslinked network, presents a high-charge nanopore structure, has significantly improved power density when applied to osmotic energy conversion, has excellent tensile strength, realizes rapid ion transmission and excellent cation selectivity, and can be used in the field of osmotic energy conversion. Meanwhile, the energy can be effectively dissipated by remarkably improving the mechanical strength.

The invention relates to the technical field of biological separation, and discloses a directional extraction and purification method of giant spiny frog skin bradykinin, which comprises the following steps: S1, preparing an intelligent integrated molecularly imprinted hydrogel membrane; s2, enabling the intelligent integrated molecular imprinting hydrogel film to be in contact with skin tissues of giant spiny frogs; s3, applying specific external stimulation to the intelligent integrated molecularly imprinted hydrogel film; and S4, collecting the giant spiny frog skin bradykinin dissociated from the intelligent integrated molecularly imprinted hydrogel film. By means of the antibody-level recognition capacity of molecular imprinting sites, high-specificity capture of the giant spiny frog skin bradykinin is achieved, co-extraction of non-target molecules is effectively avoided, active driving force is provided for the main target peptide through application of an external electric field, release of the main target peptide from tissue and migration of the main target peptide into a hydrogel film are accelerated, and the hydrogel film has a good application prospect. The efficiency and pertinence of the extraction process are greatly improved from the source, and a high-purity foundation is laid for subsequent purification work.

This invention discloses a polyurea hydrogel membrane and its preparation method. The method includes the following steps: (1) adding polyisocyanate trimer, blocking agent, solvent and catalyst into a reactor in sequence, starting stirring and heating to obtain a blocked polyisocyanate component; (2) adding the blocked polyisocyanate component to a certain proportion of deionized water, stirring evenly, filtering to remove catalyst impurities; (3) mixing the product obtained in step (2) with polyetheramine in a certain proportion, transferring to a vacuum drying oven, and removing small molecule impurities for 36-48 hours at room temperature and -0.1-0 MPa to obtain a purified blocked polyisocyanate and polyetheramine composition; (4) coating the purified blocked polyisocyanate and polyetheramine composition onto a mold and heating to obtain a polyurea hydrogel membrane. The polyurea hydrogel membrane prepared by this invention has the characteristics of low temperature resistance, transparency and flexibility.

This invention provides a glucose-sensitive and antifouling bifunctional probe, its preparation method, and its application, belonging to the field of glucose detection technology. It addresses the problems of poor sensitivity and antifouling stability in existing biological probes used for glucose detection. The preparation method of the glucose-sensitive and antifouling bifunctional probe includes: preparing a phenylboronic acid hydrogel membrane as a glucose-sensitive functionalized probe; mixing 2-bromoisobutyric acid, 3,4-bis(tert-butyl-dimethyl-siloxy)-1-phenylalanine, and a chemical bridge containing a primary amine group, and performing an amidation reaction to obtain an ATRP initiator; mixing an antifouling monomer and the ATRP initiator, and performing an ATRP reaction to obtain an antifouling coating solution; wherein the chemical bridge containing the primary amine group is 1,3-diamino-isopropanol and / or pentaerythritol; and spin-coating the antifouling coating solution onto the surface of the phenylboronic acid hydrogel membrane of the glucose-sensitive functionalized probe to obtain a glucose-sensitive and antifouling bifunctional probe with an antifouling coating. This glucose-sensitive and antifouling bifunctional probe exhibits high sensitivity and antifouling stability.

This invention belongs to the field of polymer hydrogel materials technology, specifically a strong and tough hydrogel membrane and its superassembly preparation method. The superassembly preparation method includes: firstly, dissolving polyvinyl alcohol (PVA), acrylic acid (AA), 2-acrylamide-2-methylpropanesulfonic acid (AMPS), bis(2-methacryloyloxyethyl) phosphate (BMEP), and a photoinitiator in a solvent to form a homogeneous precursor solution; then, curing by ultraviolet light initiation to prepare an initial gel membrane; finally, immersing the initial gel membrane in a zirconium chloride aqueous solution at room temperature, achieving superassembly reinforcement of the hydrogel membrane through coordination crosslinking of metal ions and the polymer network. This invention features a simple process, mild conditions, and readily available raw materials. The resulting hydrogel membrane exhibits excellent mechanical properties and good deformation recovery under different pressures, making it suitable for large-scale preparation of high-performance hydrogel membranes.

The invention belongs to the field of high polymer materials, and particularly relates to a photo-thermal antibacterial and pH-responsive hydrogel film as well as preparation and application thereof. The hydrogel film contains polysaccharide, polyphenol and metal ions, the polysaccharide and the polyphenol form a stable gel network through hydrogen bonds and electrostatic interaction, the metal ions are embedded into the gel network through coordination with the polyphenol and form a metal polyphenol network, mechanical and pH response performance is enhanced, the hydrogel film is endowed with a photothermal effect, and the hydrogel film has a good application prospect. The defects of an existing natural polysaccharide-based film in the aspects of mechanical performance, antibacterial ability, photo-thermal conversion efficiency, environmental stability, intelligent monitoring and the like are overcome. The method is suitable for application and development in the fields of food packaging, medical health, intelligent monitoring and the like.

A biocompatible membrane comprised of alginate and hyaluronate. The membrane may be used to prevent unwanted scarring after surgery. The tissue adherence and the rate of bioresorption of the membrane may be modified through an external stimulus comprising a sequestering agent and a viscosity modifier.

Aspects of the present invention relate to a microfluidic concentrator chip device including a microfluidic chip having a flat body with a top and bottom surface, a first end, a second end, and a length therebetween, a channel in the body of the chip, extending from near the first end of the chip to near the second end of the chip, the channel comprising a bottom surface, a top surface, sidewalls extending from the bottom surface to the top surface, and a first end, a second end, and a length therebetween, a hydrogel membrane having a height and a width positioned within the channel, a buffer solution contained within the channel, a first electrode positioned near the first end of the channel in fluid communication with the buffer solution, a second electrode positioned near the second end of the channel in fluid communication with the buffer solution, and a power supply connected to the first and second electrodes, configured to apply a voltage across the channel.

The application discloses a yin-yang structure wound dressing, which comprises two layers, wherein the upper layer is a dense hydrophobic layer, which is a polytrimethylene carbonate fiber membrane and simulates an epidermis structure; and the lower layer is a hydrophilic layer, which is a natural high molecular fiber hydrogel membrane and simulates a dermis structure. Meanwhile, the application also discloses a preparation method of the yin-yang structure wound dressing. The multifunctional wound dressing with the yin-yang membrane structure is prepared by firstly adopting electrospinning technology to prepare a natural high molecular fiber hydrogel membrane and a polytrimethylene carbonate fiber membrane with two different properties, and then bonding the two membranes with different properties together by a photo-crosslinking method to construct a multi-level wound repair dressing with a stable structure and simulating skin, so that the nanofiber structure of human skin is restored to the maximum extent, and the purpose of promoting the growth of granulation tissue at a wound and the recovery of structures such as hair follicles, blood vessels and nerves is achieved from the structure of the skin itself.