Preparation method of electrostatic spinning hollow fiber membrane

A technology of electrospinning and electrospinning process, which is applied in the field of preparation of electrospinning hollow fiber membranes, can solve problems such as complex operation steps, influence of hollow fiber performance, and incomplete removal of core layer materials, and achieve high separation accuracy , Improve the bonding strength, improve the effect of mechanical properties

Active Publication Date: 2017-11-14
TIANJIN POLYTECHNIC UNIV
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Problems solved by technology

Application No. 201210217561.8 discloses a method for preparing hollow polymer nanofibers, using glycerol or a mixture of glycerol and water as the inner phase electrospinning solution, and polymer solution as the outer phase electrospinning solution to prepare hollow nanofibers by coaxial electrospinning , but the operation steps are relatively complicated, and two different solutions need to be prepared as the shell solution and the core layer solution respectively, and subsequent washing, extraction and other steps are required to remove the core layer material to obtain hollow fiber
At the same time, the material of the core layer cannot be completely removed sometimes, and the residual core layer material may affect the performance of the hollow fiber

Method used

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  • Preparation method of electrostatic spinning hollow fiber membrane
  • Preparation method of electrostatic spinning hollow fiber membrane
  • Preparation method of electrostatic spinning hollow fiber membrane

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preparation example Construction

[0025] The invention provides a method for preparing an electrospun hollow fiber membrane, which is characterized in that it comprises the following steps:

[0026] A. Preparation of hollow braided tube: use two-dimensional braiding technology to weave fiber filaments into a hollow braided tube, and use the hollow braided tube as a reinforcement for electrospinning hollow fiber membranes;

[0027] The fiber filaments are at least one of polyacrylonitrile filaments, polyester filaments, polyamide filaments or polypropylene filaments; the weaving pitch is 1-3mm, the speed of the two-dimensional braiding machine is 500-1500rpm, and the pitch The smaller, the thinner the hollow braided tube;

[0028] B. Preparation of spinning solution: dissolving 5-20wt% polymer resin and 0-10wt% additive in 70-95wt% solvent to form spinning solution, the sum of each component being 100wt%;

[0029] The polymer resin is a conventional fiber-forming polymer, such as at least one of polyacrylonitr...

Embodiment 1

[0037] A. Fabrication of Hollow Braided Tubes

[0038]Using a 24-spindle two-dimensional braiding machine, set the braiding pitch to 2 mm, and the rotation speed to 800 rpm, to braid the polyester fiber filaments into a polyester hollow braided tube with an outer diameter of 2.0 mm.

[0039] B. Preparation of spinning solution

[0040] Weigh 5 g of dried polyacrylonitrile resin (model: P1361; molecular weight: 90,000), prepare it into a N,N-dimethylacetamide solution with a polyacrylonitrile mass fraction of 10 wt%, add 2 wt% PEG600, and heat at 75°C Stir for 3 hours to obtain a homogeneous solution, and obtain a spinning solution after vacuum defoaming.

[0041] C. Preparation of electrospinning hollow fiber membrane: Immerse the polyester braided tube in N,N-dimethylacetamide solution with a mass fraction of 1 wt% polyacrylonitrile for 1 min, inject 5 ml of the prepared spinning solution into the electrostatic In the spinning injector device, the spinning parameters are se...

Embodiment 2

[0043] A. Fabrication of Hollow Braided Tubes

[0044] A 24-spindle two-dimensional braiding machine was used to set the braiding pitch to 1 mm and the rotational speed to be 700 rpm to braid polypropylene fiber filaments into a polypropylene hollow braided tube with an outer diameter of 1.6 mm.

[0045] B. Preparation of spinning solution

[0046] Weigh 5 g of dried polyvinylidene fluoride resin (model: Solvay 1002; molecular weight: 90,000) to prepare a N,N-dimethylacetamide solution with a mass fraction of polyvinylidene fluoride of 8 wt%, and add 0.1 wt% Lithium chloride was stirred at 75°C for 3 hours to obtain a homogeneous solution, and the spinning solution was obtained after vacuum defoaming.

[0047] C. Preparation of Electrospun Hollow Fiber Membranes

[0048] Immerse the polypropylene braided tube in the N,N-dimethylacetamide solution with a mass fraction of polyvinylidene fluoride of 2wt% for 1 min, inject the prepared spinning solution into three 5ml electrospi...

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Abstract

The invention discloses a preparation method of an electrostatic spinning hollow fiber membrane. The method comprises the steps of (A) preparing a hollow braided tube: braiding fiber filaments into the hollow braided tube by adopting a two-dimensional braiding technology; (B) preparing a spinning liquid: dissolving 5-20w% of polymer resin and 0-10wt% of an additive into 70-95wt% of solvent to prepare a spinning liquid, wherein the sum of various components is 100wt%; and (C) preparing the electrostatic spinning hollow fiber membrane: sleeving a filament receiving device with the hollow braided tube obtained in the step (A), injecting the spinning liquid obtained in the step (B) into a spinning device, carrying out electrostatic spinning and air solidification, and then solidifying and forming in a coagulating bath to obtain the electrostatic spinning hollow fiber membrane. The hollow fiber membrane is prepared by adopting the method of combining the two-dimensional braiding technology and an electrostatic spinning method. The prepared electrostatic spinning hollow fiber membrane mainly comprises a reinforcement body and a separation layer, and meanwhile has the advantages of high porosity, high separation accuracy and high strength.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a method for preparing an electrostatic spinning hollow fiber membrane. Background technique [0002] Electrospinning technology can continuously produce polymer fibers with a diameter of submicron or even nanometer, the fiber diameter is controllable, has a large specific surface area, and exhibits good functional properties. The advantages of cost, high yield and easy control have aroused great interest of researchers over the years. [0003] Hollow fiber membrane is one of the main forms of separation membrane. Compared with plate membrane and other forms, it has the advantages of large effective area per unit volume, good separation effect, compact structure and easy integration. At present, the preparation of hollow fiber membranes mostly adopts solution spinning method, melt spinning stretching method and thermal phase separation method; [0004] Previous researchers us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/42B01D71/34B01D71/16B01D71/30B01D71/48B01D71/56B01D71/26B01D71/68B01D69/08B01D67/00
CPCB01D67/0002B01D69/087B01D71/16B01D71/26B01D71/30B01D71/34B01D71/42B01D71/48B01D71/56B01D71/68
Inventor 黄庆林黄岩高尚鹏张梦媛
Owner TIANJIN POLYTECHNIC UNIV
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