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Nanofiber microfiltration membrane and preparation method thereof

A technology of nanofibers and nanofiber webs, applied in the field of membrane separation, can solve the problems of small entanglement force between fibers, difficult microfiltration membranes, high porosity, etc., and achieve low filtration pressure drop, high production efficiency, and large flux Effect

Inactive Publication Date: 2013-05-22
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, unlike the densely packed nanofibers in electrospun nanofiber membranes, due to the action of high-speed airflow, the solution-sprayed nanofiber webs are very fluffy, have high porosity and large pore size, and small interfiber entanglement, making it difficult to use as a microfiltration membrane.

Method used

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  • Nanofiber microfiltration membrane and preparation method thereof
  • Nanofiber microfiltration membrane and preparation method thereof
  • Nanofiber microfiltration membrane and preparation method thereof

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preparation example Construction

[0026] see figure 1 , the preparation method of the nanofiber microfiltration membrane of the present invention comprises the steps: the spinning solution is supplied to the spinneret die head, the spinning solution is extruded from the spinneret holes to form a fine flow of the spinning solution, and at the same time, at least one The high-speed airflow blows the fine stream of spinning liquid at an injection angle of 0-30 degrees to the fine stream of spinning liquid to achieve stretching and refinement of the fine stream of spinning liquid, and at the same time accelerates the volatilization of solvent in the spinning liquid to form nanofibers and The nanofiber net is condensed on the receiving device to obtain the nanofibrous net; the nanofibrous net is hot-rolled to obtain the nanofiber microfiltration membrane.

[0027] What is not mentioned in the present invention is applicable to the prior art.

Embodiment 1

[0030] (1) dissolving polyvinylidene fluoride (PVDF) in N,N-dimethylacetamide / acetone (8:2, v / v) to obtain a spinning solution with a mass concentration of 16%, which is supplied to the The 20-hole spinneret die is extruded from the spinneret holes with a diameter of 0.3mm to form a thin stream of spinning solution, and at the same time, the high-speed airflow with a temperature of 30°C and 3200 times higher than the speed of the fine flow of spinning solution passes through the air gap Spray the thin stream of spinning solution at a jet angle of 30 degrees to achieve stretching and thinning of the spinning solution, and promote the volatilization of the solvent in the spinning solution to form a PVDF nanofiber network. The scanning electron microscope picture is shown in the attachment figure 2 , it can be seen that the main distribution of its fiber diameter is 60-340nm, and the average diameter is 170nm; the above-mentioned PVDF nanofibrous web is hot-rolled through a pair ...

Embodiment 2

[0034]Polyamide 6 (PA6) is dissolved in formic acid to obtain a spinning solution with a mass concentration of 18%, which is supplied to a spinning die containing 20 holes through a metering pump, and is extruded from a spinning hole with a diameter of 0.3mm to form a spinning solution. At the same time, the high-speed air flow at a temperature of 20°C and 1800 times higher than the speed of the spinning dope fine flow is blown through the air gap at an injection angle of 10 degrees to achieve the control of the spinning dope fine flow. Stretch and refine, and promote the volatilization of the solvent in the spinning solution to form a PA6 nanofiber web. The above-mentioned PA6 nanofibrous web is hot-rolled through a pair of rolls. The hot-rolling temperature is 160°C and the pressure is 0.4MPa. Afterwards, the scanning electron microscope observed that the surface fibers were fused due to hot rolling, and the overall strength was greatly improved. The scanning electron microsc...

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Abstract

The invention belongs to the field of membrane separation, and in particular relates to a microfiltration membrane prepared from nanofibers as raw materials and a preparation method thereof. The method comprises the following steps: supplying a polymer spinning solution to a spinneret; extruding the spinning solution from a spinneret orifice to form a spinning solution streamlet; spraying the spinning solution streamlet by utilizing the high-speed airflow with a spray angle of 0 to 30 degrees so as to obtain the nanofibers; condensing the nanofibers on a receiving device to form a nanofiber net; and carrying out hot rolling treatment on the nanofiber net so as to obtain the nanofiber microfiltration membrane. The prepared nanofiber microfiltration membrane is formed by the fibers with the diameter of less than 1000 nm, the diameter range of a pore space between the fibers is from 0.4 to 15 mu m, the thickness range is from 20 to 200 mu m, and the surface fibers are combined together. The nanofiber microfiltration membrane has the advantages that the filtration pressure drop is small, the flux is large, the rejecting rate to micron-level particles is high and the like. The method is high in production efficiency and simple in preparation process, thereby being suitable for industrialized application.

Description

technical field [0001] The invention belongs to the field of membrane separation, and in particular relates to a microfiltration membrane obtained by using nanofiber as a raw material and a preparation method thereof. Background technique [0002] Microfiltration is a mechanical filtration method, which is suitable for separating the tiny suspended substances in the liquid to the maximum extent. It has the characteristics of mild treatment conditions, no phase transition, no additives, low energy consumption, and easy use. It has been widely used in Biotechnology, electronics, chemical industry and food industry and other fields. However, the commonly used polymer porous microfiltration membranes have some unavoidable limitations due to their inherent pore structure, such as low flux, high filtration resistance, and easy contamination. [0003] Recent studies have shown that nanofiber membranes composed of random stacks of electrospun nanofibers can overcome the defects of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/06B01D67/00
Inventor 庄旭品程博闻石磊康卫民焦晓宁
Owner TIANJIN POLYTECHNIC UNIV
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