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Method for producing nano-fibre film with macromolecular solution electrostatic filature and implementing equipment

A nanofiber membrane and electrospinning technology, which is applied in fiber processing, textiles and papermaking, filament/thread forming, etc., can solve the problem of limited viscosity range of electrospinning liquid, difficulty in electrospinning of solution, and non-rigid storage tank of electrospinning liquid. issues of closure

Inactive Publication Date: 2008-07-16
北京汇益科技有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

This technology has several major disadvantages: the viscosity range of the electrospinning solution is limited, and it is difficult to electrospin a solution above 300 centipoise; in order to facilitate electrospinning, electrolytes are added to adjust the conductivity of the electrospinning solution, thereby changing the properties of the electrospinning product; The non-closed nature of the electrospinning solution storage tank is unfavorable to the volatile solvent system of the electrospinning solution

Method used

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  • Method for producing nano-fibre film with macromolecular solution electrostatic filature and implementing equipment

Examples

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Effect test

example 1

[0009] Example 1. Polyvinylidene fluoride (PVDF) was used as the electrospun material, the molecular weight Mw=800,000, dimethylformamide (DMF) was used as the solvent, and acetone was used as the regulator. An electrospinning solution with a PVDF content of 8% was prepared with a mixed solvent of DMF:acetone=8:2 (V / V), and its viscosity was 300 centipoise. The nanofiber membrane is prepared by using the electrospinning membrane forming device of the present invention. The electrospinning liquid is transported to the liquid storage tank 1 by an automatic infusion pump, and then flows into the liquid storage tank of the nozzle group 5 . Then the electrospinning solution passes through the inner small cylinder of the double-layer structure cylinder nozzle, and flows out from the top of the outer cylinder. The high-voltage end of the DC high-voltage power supply is connected to the nozzle group 5, and the other end is grounded, and the wire connecting cylinder is also connected ...

example 2

[0010] Example 2. Polyacrylonitrile (PNA) was used as the electrospun material, the molecular weight Mw=65,000, and dimethylformamide (DMF) was used as the solvent. A solution with a PNA content of 10% was prepared with a viscosity of 280 centipoise. The nanofiber membrane is prepared by using the electrospinning membrane forming device of the present invention. Control the electrospinning voltage to 23,000 volts, the temperature to 30°C, and the distance between the nozzle and the wire-connecting cylinder to be 180mm. A nanofibrous membrane with a thickness of 25 μm and a porosity of 75% was obtained.

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Abstract

The invention relates to a method for preparing nanometer fiber films using polymer solutions and a device used for implementing the method. The method for preparing nanometer fiber films of the invention is an electrostatic spinning method and the device used for implementing the method is an electrostatic spinning filming device. The composition characteristic of the device is that the device is provided with a nozzle group consisting of double-layer structure cylindrical nozzles. Each nozzle consists of an outer layer cylinder and a little inner layer cylinder and the electro spinning solution flows from the inner layer to the outer layer to carry out electrostatic spinning film-making in the interlayer. The method can improve the unit time spinning amount of each nozzle and the spinning amount is three times larger than that of a single-layer nozzle, which is beneficial to industrial production. By adopting the electrostatic spinning filming device of the invention, appropriate high polymer solutions are used for preparing nanometer fiber films, which can form continuous production. The device can produce various nanometer fiber films.

Description

technical field [0001] The invention relates to a method for preparing a nanofiber membrane from a polymer solution and equipment for implementing the method. The method for preparing the nanofiber membrane involved in the present invention is an electrospinning method, and the equipment for implementing the method is an electrospinning membrane making device. Background technique [0002] Membranes formed from nanofibers are a new class of materials with many valuable properties. The most typical application fields of this type of membrane are battery separators, filter membranes, composite materials, drug carriers, etc. Preparation of polymer nanofiber membranes by electrospinning is described in patents WO127365; WO250346; US2002175449; US2002084178. In these technical solutions, the spinning nozzle is a cylindrical capillary with a diameter of about 0.5 mm. Each capillary processes about 0.1 grams of high molecular weight in one hour, and industrial production require...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/00C08J5/18
Inventor 刘冉
Owner 北京汇益科技有限公司
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