72 results about "Polyethersulfone membrane" patented technology

The invention provides a preparation method and application of a lithium-ion-imprinted polyethersulfone composite membrane, belonging to the technical field of preparation of functional materials. The lithium-ion-imprinted polyethersulfone composite membrane is prepared with a polyethersulfone membrane as a substrate membrane material, lithium ions as a template, 12-crown-4-ether as a binding site, methacrylic acid as a functional monomer, ethylene glycol dimethacrylate as a cross-linking agent and azodiisobutyronitrile as an initiator by using a combination of dopamine surface modification technology, silica nanometer compounding technology and imprinted polymerization technology. Static adsorption experiments are conducted to research the adsorption equilibrium, kinetic performance and selective recognition performance of the prepared lithium-ion-imprinted polyethersulfone composite membrane; and selective permeation experiments are carried out to research the permeation action of the prepared lithium-ion-imprinted polyethersulfone composite membrane on target ions (lithium ions) and non-target ions (sodium ions and potassium ions). The lithium-ion-imprinted polyethersulfone composite membrane prepared in the invention has high specific lithium ion adsorption capability and lithium ion recognition and separation capability.

The invention relates to a method for separating cow milk beta-casein and whey protein at the low temperature through microfiltration to simulate composition of human lactoprotein. Skim milk, whole milk, dried skim milk, concentrated milk protein powder and the like are taken as raw materials, decalcification pretreatment is performed with the adoption of citrate, glucono-delta-lactone and other chelating agents or an acidifier, microfiltration and filter wash are performed with the adoption of a ceramic membrane or a polyethersulfone membrane and the like under the low-temperature (0-15 DEG C) condition, beta-casein and whey protein are selectively enriched into a permeating liquid, the permeating liquid is subjected to spray drying and dewatering after lactose and mineral substances are removed through ultrafiltration and concentration, and high-protein powder containing rich beta-casein and whey protein is prepared. An adopted technical process has the characteristics of being environment-friendly, efficient, high in operability, good in safety and the like and is suitable for large-scale industrial production. The obtained compound protein powder can serve a novel functional lactoprotein ingredient to replace whey protein and is used for research and development of infant food such as formula milk powder and the like, so that the protein molecule composition of the compound protein powder is closer to that of human lactoprotein.

The invention relates to a method for preparing large-aperature polyethersulfone film. Where, it comprises that: 1, as mass percentages, dissolving 9-15% polyethersulfone at 0.4-0.6 viscosity, polyvinyl pyrrolidon additive at 5-10% into organic solvent at 75-86%; mixing into casting film solution; 2, extending said solution on the non-woven cloth, the scrap film thickness is 0.20-0.35mm, the filming speed is 1.5-4.5m/min; 3, processing general gel water bath on the non-woven cloth to obtain film. The inventive film has 0.05-0.35micrometer aperture, as the filter film of filter biological reactor.

The invention provides a polyamide thin-layer composite reverse osmosis membrane as well as a preparation method and application thereof. The preparation method comprises the steps: preparing an ultrathin metal organic framework nanosheet zinc-meso-tetra(4-carboxyphenyl)porphin; ultrasonically dissolving the ultrathin metal organic framework nanosheet zinc-meso-tetra(4-carboxyphenyl)porphin in alcohol, performing filter pressing on a polyethersulfone ultrafiltration membrane through a filter pressing method to prepare an ultrathin middle layer, and soaking the composite membrane in a resorcinol aqueous solution and a n-hexane solution containing polybenzoyl chloride to form the polyamide thin-layer composite reverse osmosis membrane. The middle layer of the metal organic framework nanosheet can be used as a water permeation channel, so that the geometric resistance of water molecules infiltrating from a polyamide membrane to a polyether sulfone membrane is reduced, and the permeation rate of water in a polyamide thin-layer composite reverse osmosis membrane is increased; the ultrathin middle layer provides a good reaction container for formation of interfacial polymerization reaction, the surface area and crosslinking degree of the prepared polyamide membrane are increased, the internal thickness of the polyamide membrane is reduced, and the salt rejection rate is also improvedwhile the membrane flux is greatly increased.

The invention relates to a preparation method and application of an anti-pollution polyethersulfone membrane grafted with polydimethylsiloxane on the surface. The preparation of the membrane material is completed through the following three steps, that is, the polyethersulfone base membrane is first prepared by the immersion precipitation phase inversion method; then a highly reactive polydopamine molecular layer is grafted on its surface; The active quinone group on the dopamine molecular layer and the amino-terminated polydimethylsiloxane undergo Michael addition reaction to prepare the polyethersulfone membrane grafted with polydimethylsiloxane (PDMS) on the surface. The preparation method of the membrane material is simple and does not require harsh reaction conditions. When treating oil-water emulsions, the rejection rate is as high as 100%, the flux depletion rate can be reduced to 13.9%, and the flux recovery rate is as high as 94.0%. It has a wide range of applications in the field of oily sewage treatment. application prospects.

The invention relates to a heparin affinity chromatography method of recombinant herpes simplex virus. The method comprises: filtering out cell debris from the virus supernatant, and concentrating by using a polyethersulfone membrane disc type filter; carrying out cryopreservation on the concentrated solution in a -80 DEG C refrigerator; loading heparin into a HR 5/5 column, thawing the concentrated sample, and then loading the thawed sample into the column; and carrying out elution, collecting three peak value eluents, and carrying out cryopreservation at a temperature of -80 DEG C or in liquid nitrogen. The method of the present invention has the following advantages that: the molecular characteristic that the heparin affinity chromatography column has a large number of negatively charged sulfate groups is used, the negatively charged sulfate groups can be adopted as the affinity ligand in protein and virus purification so as to selectively bind with the protein molecules and other molecules on the virus surface, and the salt ions with different concentrations are used to carry out gradient elution so as to achieve the separate virus elution purpose.

The invention belongs to the technical field of medicines, and relates to a preparation method of a sulfydryl-containing modified blood purification membrane. The preparation method comprises the following steps: 1) preparation of aminated polyether sulfone, 2) preparation of sulfydryl polyether sulfone, and 3) preparation of a sulfydryl polyether sulfone membrane. The invention also discloses thesulfydryl-containing modified blood purification membrane prepared by the preparation method. The sulfydryl-containing modified blood purification membrane has the advantages of improvement of the oxidation resistance of a dialysis membrane, protection of leucocytes, reduction of the vascular permeability, simple preparation method, and realization of industrial batch production.

The invention discloses an aluminum ion cross-linked MXene-ascorbic acid membrane and a preparation method thereof, and belongs to the field of environment-friendly water treatment. According to the invention, ascorbic acid and aluminum ions are utilized to carry out composite cross-linking on MXene nanosheets to load the MXene nanosheets to the surface of a 100kd polyethersulfone membrane. The aluminum ion cross-linked MXene-ascorbic acid membrane prepared by the invention has excellent oxidation resistance, can stably operate in water for a long time, intercepts pollutants in water through a size exclusion effect, and also can effectively inhibit permeation of sodium chloride ions in a forward osmosis process. The method is simple and easy to operate, easy for large-scale application and beneficial to popularization.

The invention provides a lead ion responsive smart membrane, which is composed of a polyethersulfone membrane substrate and poly(N-isopropylacrylamide-co-benzo-18-crown-6acrylamide) nanospheres. The nanospheres and the polyethersulfone membrane substrate are in a mass ratio of (12-17):100. The smart membrane has an interpenetrating membrane structure and a micron-scale membrane pore size. The nanospheres are distributed on the surface of the smart membrane and hole wall surfaces of the membrane holes. The smart membrane can realize measurement of the membrane flux under gravity driving, and has temperature and lead ion dual response properties. The invention also provides a preparation method of the smart membrane and a detection method for lead ions in a water sample based on the smart membrane, and realizes convenient and high sensitivity detection of lead ions under atmospheric pressure condition.

The invention discloses a purification method maintaining cystatin C antibody-latex covalently coupled compound activity. The method consists of: transferring a to-be-purified cystatin C antibody-latex covalently coupled compound crude solution to a tangential flow filtration system, setting the shear force, arranging an ultrafiltration membrane in a hollow fiber membrane filter, wherein the ultrafiltration membrane is a modified polyethersulfone membrane with a molecular weight cut-off of 500KD, setting the shearing force at 2000s<-1>, a corresponding membrane area of 115cm<2>-2600cm<2> and a pump speed of 30ml/min-1150ml/min; concentrating the solution within 60min by 5 times to obtain a crude concentrated cystatin C antibody-latex covalently coupled compound solution; and within 60min using a buffer solution to elute the crude concentrated cystatin C antibody-latex covalently coupled compound solution by 5 times. The method provided by the invention needs short time, the purified antibody-latex compound has high reaction activity, is not only suitable for small-scale preparation in laboratories, but also suitable for industrial large-scale production.

The invention provides a polyethersulfone temperature-sensing catalytic membrane and a preparation method and an application thereof. The polyethersulfone temperature-sensing catalytic membrane is composed of a polyethersulfone membrane base material and temperature responsive microsphere carried with a nano metal catalyst distributed in the base material, the temperature responsive microsphere iscomposed of poly-isopropyl acrylamide microsphere, a poly dopamine coating positioned at the surface of the N-isopropyl acrylamide microsphere and the nano metal catalyst fixed at the poly dopamine coating. The catalytic membrane has a cell-shaped hole structure, the composition of the temperature responsive microsphere is mainly distributed at a hole wall of the cell-shaped hole structure. The flux and catalysis performance of the catalytic membrane is changed by responding the change of the temperature, when the usage temperature of the catalytic membrane is conversed from lower than the volume phase transition temperature of the poly N-isopropyl acrylamide to higher than the volume phase transition temperature of the N-isopropyl acrylamide, The catalysis reaction rate constant of the catalytic membrane is subjected to abrupt increase.

The invention discloses a preparation method of the extract of Daphniphyllum calycinum and Polygonum hydropiper L., which comprises the following steps: 1) taking the mixture of Daphniphyllum calycinum and Polygonum hydropiper L., decocting with water to obtain decoction; 2) purifying the decoction obtained in the step 1) by means of microfiltration and/or ultrafiltration at a filtration pressureof 0.20-0.40 MPa at 30-90 DEG C, with membrane flux being 50-400L/m<2>.h, wherein, the membrane used for the microfiltration is one of cellulose ester membrane, polypropylene membrane, metal membrane,ceramic membrane and glass membrane, and the pore diameter is 30-200 nm; the membrane used for the ultrafiltration is one of polyethersulfone membrane, tubular membrane, magnetic composite membrane,polysulfone, polyethersulfone, cellulose acetate, polyamide and polytetrafluoroethylene, and the molecular weight cut-off is 10,000-100,000 dalton; 3) concentrating that filtrate into thick paste, drying, and pulverizing into fine powder. The active ingredient enrichment effect of the method is good, and the purity of the obtained extract is high. When the extract is used for prepare a pharmaceutical composition for treating acute and chronic gastroenteritis, the obtained pharmaceutical composition has good stability.

The invention discloses a permanent antibacterial polyether sulfone membrane material and a preparation method thereof. According to the invention, through a Co-gamma radiation grafting chemical modification method, a unsaturated bond-containing ionic liquid connected by chemical bonds is uniformly distributed on the surface of polyethersulfone, wherein a mass ratio of the ionic liquid to the polyethersulfone is 2-11:100; according to the method, through radiation irradiation, the ionic liquid of the blended flat plate membrane is connected to the polymer through the chemical bond; and due togood compatibility between the polymer and the ionic liquid, the small molecules of the ionic liquid can fully contact the polymer during radiation irradiation, so that the small molecules of the ionic liquid are grafted to the PES molecular chain.

The invention discloses a polyethersulfone hollow fibrous membrane with supporting materials and a preparation method thereof. The preparation method of the polytetrafluoroethylene hollow fibrous composite membrane with the supporting materials has the following steps: taking Tween 80 or polyethylene glycol as an additive and N-methylpyrrolidone or N,N-dimethylformamide as a solvent to prepare the polyethersulfone hollow fibrous membrane by a dry-wet method, ensuring monofilaments to enter into a spinneret from other inlets and blending the polyethersulfone hollow fibrous membrane with the monofilaments, wherein the monofilament fibrous materials are polyester, spandex, nylon 6, nylon 66 or polyurethane and have diameter of 0.01-2mm. According to the invention, the defect that the hollow fibrous membranes without supports have insufficient physical tensile strength and are easy to suffer from filament break is overcome; the physical tensile strength of the membrane disclosed by the invention is improved by more than several times compared with that of the hollow fibrous membranes without supports; support and membrane stripping can be avoided; the water flux and manufacturing cost of the membrane disclosed by the invention are equivalent to those of the hollow fibers without supports; and the membrane has technical and economic breakthroughs, can replace the existing hollow fiber products and has great economic and social benefits.

The invention discloses a preparation method of a polydopamine modified polyethersulfone imprinted composite membrane, and belongs to the field of carbon material preparation, surface functional modification and application, and can solve the problem that specific separation cannot be realized when an existing membrane separation technology is applied to removal of phenol in industrial wastewater., The preparation method includes the following steps: preparing glucose microporous carbon nanospheres with a hydrothermal method, and performing surface activation by using a silane coupling agent;modifying the surface of the polyethersulfone membrane by adopting a dopamine biomimetic modification technology; by taking glucose as a carrier, phenol as a template molecule and 4-vinylpyridine as afunctional monomer, compounding functionalized glucose microporous carbon spheres with a dopamine-modified polyether sulfone membrane through a thermal initiation polymerization reaction, and performing cross-linking polymerization on the surface of the membrane to form an imprinted polymer layer with a specific recognition function on phenol molecules. According to the imprinted composite membrane, a surface molecular imprinting technology and a membrane separation technology are combined, and the prepared material has a large specific surface area and high-affinity phenol imprinting recognition sites.

The invention discloses a nano drug delivery system of a grassland spodoptera litura sex attractant and application of the nano drug delivery system. The amphiphilic lipid molecule loaded sex pheromone and the synergist linalool are formed by self-assembly of amphiphilic lipid molecules DSPE-mPEG5000 (1, 2-distearoyl-sn-glycerin-3-phosphoethanolamine-N-[methoxy(polyethylene glycol)-5000]), sex pheromone and linalool through a cosolvent method, and then the amphiphilic lipid molecule loaded sex pheromone and the synergist linalool are adsorbed onto a sustained-release carrier 0.22 [mu]m polyether sulfone membrane. The sex pheromone is composed of (Z)-9-tetradecene-1-alcohol acetate, (Z)-7-dodecene-1-alcohol acetate and (Z)-11-hexadecene-1-alcohol acetate in a mass ratio of 90: 0.5: 9.5. Theinvention further discloses a moth luring effect of the moth luring agent as a grassland spodoptera litura sex luring agent in the field.

The invention provides a lanthanide fluoride two-dimensional nanosheet membrane as well as a preparation method and application thereof, and belongs to the technical field of membrane separation. The preparation method comprises the following steps: mixing water-soluble lanthanide metal salts with a sodium acetate aqueous solution in inert gas to obtain a mixed solution; mixing the mixed solution with a fluorine-containing salt aqueous solution, and carrying out precipitation reaction to obtain a lanthanide fluoride two-dimensional nanosheet suspension; depositing the lanthanide fluoride two-dimensional nanosheet suspensionon a porous substrate, carrying out drying to obtain the lanthanide fluoride two-dimensional nanosheet membrane, wherein the porous substrate is a polyethersulfone membrane, a nylon membrane, a polyvinylidene fluoride membrane, a polycarbonate membrane, a ceramic membrane, a metal membrane or an anodic aluminum oxide membrane. The lanthanide fluoride two-dimensional nanosheet membrane prepared by the invention has the characteristics of high permeability, high separation precision and good stability, and the preparation method is simple; and when the porous substrate is an inorganic membrane, the prepared lanthanide fluoride two-dimensional nanosheet membrane has high solvent resistance and separation performance.

The invention discloses a sewage treatment membrane with high decontamination efficiency. The sewage treatment membrane is prepared from the following raw materials in parts by weight: 60 to 70 partsof polyethersulfone resin, 4 to 6 parts of a functional filler, 9 to 11 parts of a modification polymer, 20 to 24 parts of a pore-forming agent and 400 to 500 parts of N,N-dimethylformamide. The invention also discloses a preparation method of the sewage treatment membrane. The sewage treatment membrane provided by the invention is a polyethersulfone membrane prepared by using the pore-forming agent, not only has high acid and alkali resistance, but also has good retention performance; the polyethersulfone resin is modified by the modification polymer, a stable hydration layer can be formed onthe surface of the membrane, a low-adhesion micro region can be formed, excellent pollution release self-cleaning ability is given to the membrane surface without affecting the flux of the membrane,so that the decontamination efficiency of the membrane can be improved; and the functional filler is added into raw materials of the membrane, and the filler can not only exert physical and chemical adsorption, but also play a photocatalytic effect, has stronger sewage treatment capacity, and effectively improves the treatment efficiency of the membrane.

The invention relates to the technical field of membrane filtration, and discloses a preparation method of a high-flux polytetrafluoroethylene composite nanofiltration membrane. The preparation methodcomprises the following steps: S1, carrying out activation modification on a hydrophobic polytetrafluoroethylene microporous membrane by utilizing sodium alginate to obtain a hydrophilic polytetrafluoroethylene microporous membrane; S2, carrying out surface modification treatment on the quartz glass fibers by utilizing a silane coupling agent; S3, grafting trihydroxy quaternary ammonium salt to the surface of the quartz glass fiber to obtain modified quartz glass fiber; S4, depositing the modified quartz glass fiber on a hydrophilic polytetrafluoroethylene microporous membrane by a standing adsorption method to form a fiber net so as to obtain a pretreated polytetrafluoroethylene microporous membrane; and S5, coating the surface of the pretreated polytetrafluoroethylene microporous membrane with a polyethersulfone membrane casting solution, and drying to form the membrane. In the preparation process of the polytetrafluoroethylene composite nanofiltration membrane, macromolecular organic substances can be prevented from permeating into the polytetrafluoroethylene composite nanofiltration membrane from cracks in the surface of the polytetrafluoroethylene microporous membrane to block membrane holes so that the water flux of polytetrafluoroethylene composite nanofiltration is improved.

The invention discloses a preparation method of a disposable polyethersulfone liquid medicine membrane, belonging to the technical field of biomedical polymer materials. The method disclosed by the invention comprises the following steps of: step 1, mixing and dissolving polyethersulfone with an organic solvent at 40-80 DEG C, adding a pore-forming agent, carrying out sufficient stirring and dissolving, filtering out insoluble substances, and carrying out vacuum defoaming to obtain a membrane casting solution, wherein the membrane casting solution comprises, in parts by weight, 15-20 parts ofpolyethersulfone, 45-60 parts of the organic solvent and 1-10 parts of the pore-forming agent; and step 2, casting the membrane casting solution on a support body, and conducting knifing by using a scraper to obtain a primary membrane. According to the preparation method, hydrophilic bonds can be better grafted to a base membrane of the polyethersulfone micro-filtration membrane, so the hydrophilicity of the polyethersulfone membrane is greatly improved, and the flux of liquid is improved; and due to the existence of charges, the anti-pollution capability of the filtration membrane is improved, the service life of the filtration membrane is prolonged, use cost is reduced, and good economic benefits are obtained.

The invention provides a high-flux polyethersulfone membrane. A polyethersulfone ultrafiltration membrane blended with hydrophilic molecular sieves is prepared by mixing ball-milled NaA molecular sieves with a conventional polyethersulfone casting membrane solution; the membrane is placed in a NaA molecular sieve synthesis solution for carrying out hydrothermal crystallization, so that ball-milledNaA molecular sieve particles at the edges of pore passages are used for inducing and synthesizing integrated NaA molecular sieves, and the water flux of the membrane is obviously improved. The prepared polyethersulfone membrane material can be used in the field of hematodialysis.

The invention relates to a preparation method of animal glue for improving hair loss. The preparation method comprises the following steps of (1) thoroughly cleaning fresh Qinghai-Tibet plateau yak skin having hair, and performing illumination through an ultraviolet lamp so as to obtain illuminated yak skin; (2) cutting the illuminated yak skin into blocks, performing extraction in boiling water,taking out the yak skin blocks after extraction, and cutting through the yak skin with a multi-stab board; (3) putting the cut-through yak skin in enzymatic hydrolysate of 0.5-10% for enzymolysis, andperforming filtration so as to obtain yak skin after enzymolysis and a first-time enzymolysis solution; (4) adding the yak skin after enzymolysis into water, and performing boiling so as to obtain filtrate; (5) adding activated carbon to the filtrate, performing sufficient stirring, then performing standing, and performing filtration so as to obtain filter residues; (6) putting the filter residues in enzymatic hydrolysate of 0.5-8% for enzymolysis, and performing filtration so as to obtain a second-time enzymolysis solution; (7) merging the first-time enzymolysis solution with the second-timeenzymolysis solution, performing boiling, and performing separation so as to obtain supernatant; and (8) filtrating the supernatant with a polyethersulfone membranes, cutting off keratin liquid of which the molecular weight is 40-75kDa and yak skin micromolecule peptide of which the molecular weight is 5kDa or below, and performing freeze drying so as to obtain yak glue. The method disclosed by the invention is simple and easy to implement.