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907 results about "Hollow fibre" patented technology

Method of selectively shaping hollow fibers of heat exchange catheter

A group of multiple hollow fibers may be shaped to introduce angular divergence among the fibers, or to introduce a selected longitudinal oscillation into the fibers. In one shaping technique, the fibers are held in parallel while upper and lower crimping assemblies of parallel crimping bars are drawn together on opposite sides of the parallel fibers. When bars of the opposing assemblies draw sufficiently close, they sandwich the fibers in between them, causing each fiber to assume a shape that oscillates as the fiber repeatedly goes over and then under successive bars. Since the crimping bars are aligned at oblique angles to the fibers, the peaks and troughs of successive fibers are offset. While in this position, the fibers are heated and then cooled to permanently retain their shapes. A different shaping technique utilizes a lattice of crisscrossing tines defining multiple apertures. In this technique, the lattice and fibers are positioned so that each fiber passes through one of the apertures. Then, the lattice and/or the fibers are slid apart or together until the lattice holds the fibers in a desired configuration, where the fibers have a prescribed outward divergence relative to each other. While in this position, the fibers are heated and then cooled to permanently retain this angular divergence.
Owner:ZOLL CIRCULATION

Method for preparing polyvinylidene fluoride ultra-filtration membranes

The invention discloses a method for preparing polyvinylidene fluoride ultra-filtration membranes. The method includes the steps of mixing the polyvinylidene fluoride with diluents, and heating the mixture to form a homogeneous phase solution, wherein the diluents are a mixture of a solvent and a non-solvent of the polyvinylidene fluoride, and at least one of the solvent and the non-solvent of the polyvinylidene fluoride can be dissolved in water; subjecting the homogeneous phase solution to knife coating on a supporting screen to form a plate-shaped membrane casting solution or to be spinned into a membrane casting solution in a hollow fiber shape by a spinneret, submerging the membrane casting solution into a cooling liquid to be cooled, subjecting the membrane casting solution to phase separation and solidifying into membranes; extracting the diluents in the membranes through an extracting agent to obtain the polyvinylidene fluoride membranes. Sections of the polyvinylidene fluoride membranes are in a homogeneous spongeous structure with bore diameters in a range of 0.02 to 4 microns, and the membranes have surface layers with surface bore diameters ranging from 2 nanometers to 100 nanometers. Simultaneously, the polyvinylidene fluoride ultra-filtration membranes have the advantages of high strength, porosity, flux and separation accuracy.
Owner:TSINGHUA UNIV

Hollow fiber type composite nano-filtration membrane and preparation method thereof

The invention relates to a hollow fiber type composite nano-filtration membrane and a preparation method thereof. The hollow fiber type composite nano-filtration membrane comprises a hollow fiber microporous base membrane adopted as a supporting layer, a polysulfone transition layer, and a polyamide composite layer, wherein the polysulfone transition layer is positioned inside membrane holes of the hollow fiber microporous base membrane, and the polyamide composite layer is positioned inside membrane holes of the polysulfone transition layer. The preparation method comprises: adopting a thermally induced phase separation method to obtain an asymmetric microporous base membrane, adopting an impregnation phase transformation method to obtain the polysulfone transition layer in the micro holes, and adopting pressure control and an interface condensation polymerization reaction to obtain the polyamide composite layer. The hollow fiber type composite nano-filtration membrane provides a sodium chloride salt solution entrapment rate of more than 90%, a divalent salt ion entrapment rate of more than 95%, and a pollutant entrapment rate of more than 99% under 0.2-0.8 MPa, such that the hollow fiber type composite nano-filtration membrane has characteristics of high strength, washing resistance, large flux and the like, wherein the pollutants have a molecular weight of 300-200,000 Daltons.
Owner:TSINGHUA UNIV

Preparation method of layer-by-layer self-assembled hollow fiber forward osmosis membrane

The invention discloses a preparation method of a layer-by-layer self-assembled hollow fiber forward osmosis membrane. The preparation method comprises the steps of: preparing hollow fiber forward osmosis base film, modifying hollow fiber ultrafiltration base film, repeating layer-by-layer assembly of polycation and polyanion layers, performing interface cross-linking polymerization for preparinga selective functional layer, conducting moisturizing, and carrying out treatment and storage so as to prepare the layer-by-layer self-assembled hollow fiber forward osmosis membrane. The surface of the hollow fiber self-support base film which is prepared by using a phase conversion method is activated firstly, layer-by-layer assembly of polycation and polyanion is repeated on the surface of thefilm so as to form an functional polarization layer for an electrolyte solution, and the polyamide selective layer is prepared through interfacial chemical cross-linking polymerization. The prepared hollow fiber forward osmosis membrane has a controllable thickness and an internal polarization layer with a high charge capacity, and the internal concentration polarization phenomenon can be alleviated effectively during the forward osmosis process; therefore, the hollow fiber forward osmosis membrane can simultaneously obtain high flux and low reverse salt flux, has high filtration separation efficiency, easy cleaning and a long service life, and can be widely applied to seawater desalination and concentration and desalination of brine.
Owner:西安金藏膜环保科技有限公司

Preparation method for regularly electrostatic spinning hollow fibre

The present invention relates to a preparation method for regularized static electricity spinning hollow fiber, and the method comprises the procedures that: firstly, high molecular compound is dissolved in good solvent to be made into uniform solution; secondly, poor solvent is added to be dispensed into spinning raw liquid, and the volume ratio of the good solvent and the poor solvent is 10/1 to 1/3; thirdly, the spinning raw liquid is added into a container, is controlled and extruded by a micro-syringe pump, a jet opening is connected with a high voltage positive pole, a grounding microelectrode with the removable area of 0 to 100 mm 2 is taken as a negative pole, various parameters of static electricity spinning are adjusted, and the spinning raw liquid carries on the static electricity spinning; fourthly, the grounding microelectrode backwards and continuously moves, and a continuous regularized static electricity spinning hollow fiber bundle is obtained; fifthly, the continuous hollow fiber bundle obtains the regularized static electricity spinning hollow fiber through winding and collecting. The preparation method provided by the present invention is simple and feasible, and the obtained static electricity spinning hollow fiber has the potential application and the prospect in the fields such as nanowire devices, filtering materials, and composite reinforcing materials, etc.
Owner:DONGHUA UNIV

High-throughput hollow fiber composite nanofiltration membrane, and preparation method thereof

InactiveCN105617875AGuaranteed set retention performanceGuarantee that the nanofiltration membrane has a set cut-off performanceSemi-permeable membranesFiberContact formation
The invention discloses a high-throughput hollow fiber composite nanofiltration membrane. The high-throughput hollow fiber composite nanofiltration membrane is composed of a supporting layer and a separating layer; the supporting layer is prepared from a higher molecular hollow fiber ultrafiltration membrane; the separating layer is a polyamide layer obtained via interfacial polymerization of multi-amines and multi-acyl chlorides; pure water flux of the high-throughput hollow fiber composite nanofiltration membrane is high, and removing rates of the high-throughput hollow fiber composite nanofiltration membrane on NaCl in NaCl aqueous solution, and MgSO4 in MgSO4 aqueous solution are both high. A preparation method of the high-throughput hollow fiber composite nanofiltration membrane comprises following steps: nonsolvent induced phase separation method is adopted so prepare a high molecular hollow fiber ultrafiltration membrane; the high molecular hollow fiber ultrafiltration membrane is immersed into a multi-amine aqueous solution containing an acid-binding agent so as to obtain a nanofiltration memebrane precursor; the nanofiltration memebrane precursor is contacted with an organic solution of multi-acyl chlorides so as to form the polyamide separation layer and obtain hollow fiber composite nanofiltration membrane wires; and at last an oxidizing agent is used for oxidation treatment, and curing treatment is carried out so as to obtain a finished product. The high-throughput hollow fiber composite nanofiltration membrane is high in water flux, low in cost, and excellent in performance, and is convenient to prepare.
Owner:ZHUZHOU TIMES NEW MATERIALS TECH
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