Method for preparing synthetic polymer nano-fiber membrane by freeze-drying

A technology for synthesizing macromolecules and nanofiber membranes, applied in the chemical characteristics of fibers, single-component synthetic polymer rayon, single-component polyether rayon, etc. Problems such as troublesome post-processing and poor repeatability

Inactive Publication Date: 2012-04-18
HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In view of the fact that the currently prepared synthetic polymer nanofibers have relatively high requirements on process factors and environmental factors, the post-processing of the preparation method is troublesome, and the repeatability is not strong. The purpose of the present invention is to provide a method for preparing synthetic polymer nanofiber membranes. Methods

Method used

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  • Method for preparing synthetic polymer nano-fiber membrane by freeze-drying
  • Method for preparing synthetic polymer nano-fiber membrane by freeze-drying

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Polyoxyethylene is dissolved in deionized water to prepare a solution with a weight percentage of 0.001 wt%, and then the solution is fully stirred so that it is completely dissolved to obtain a polyoxyethylene solution.

[0019] (2) The polyethylene oxide solution prepared in step (1) is transferred to a liquid nitrogen freezing device, the freezing device is opened, and the prepared polyethylene oxide solution is rapidly frozen in a liquid nitrogen environment, and then the frozen polyethylene The ethylene oxide solution was transferred to a freeze dryer, and freeze-dried for 12 hours at a temperature of -10° C. and a vacuum of 100 Pa to obtain polyethylene oxide nanofibers.

Embodiment 2

[0021] (1) Dissolving polyvinylpyrrolidone in deionized water to prepare a solution with a weight percentage of 0.1 wt%, and then fully stirring the solution so as to completely dissolve, thus obtaining a polyvinylpyrrolidone solution.

[0022] (2) Transfer the polyvinylpyrrolidone solution prepared in step (1) to a liquid nitrogen freezer, open the freezer, freeze the prepared polyvinylpyrrolidone solution rapidly in a liquid nitrogen environment, and then freeze the frozen polyvinylpyrrolidone The solution was transferred to a freeze dryer, and freeze-dried for 48 hours at a temperature of -80° C. and a vacuum of 600 Pa to obtain polyvinylpyrrolidone nanofibers.

Embodiment 3

[0024] (1) Polyethylene glycol is dissolved in deionized water to form a solution with a weight percentage of 0.01 wt%, and then the solution is fully stirred so that it is completely dissolved to obtain a polyethylene glycol solution.

[0025] (2) The polyethylene glycol solution prepared in step (1) is transferred to a liquid nitrogen freezing device, the freezing device is opened, and the prepared polyethylene glycol solution is rapidly frozen in a liquid nitrogen environment, and then the frozen polyethylene glycol solution is frozen. The ethylene glycol solution was transferred to a freeze dryer, and freeze-dried for 24 hours at a temperature of -40° C. and a vacuum of 300 Pa to obtain polyethylene glycol nanofibers.

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Abstract

The invention relates to a method for preparing a synthetic polymer nano-fiber membrane by freeze-drying. The method comprises the following steps of: dissolving synthetic polymer powder in a corresponding solvent to prepare an extremely diluted solution of which the concentration is 0.001-0.1wt%; after the synthetic polymer is completely dissolved in the solvent, transferring the synthetic polymer solution to a liquid nitrogen freezing device so as to enable the solution to be quickly frozen in the liquid nitrogen environment under the conditions that the temperature is (-10)-(-80) DEG C and the vacuum degree is 1-600Pa; and then, freeze-drying for 12-48 hours by using a freeze-dryer to obtain a synthetic polymer nano-fiber. In the invention, the operation process has mild conditions, simple steps and low cost, is easy to control, and realizes the large batch production of synthetic polymer nano-fiber membranes.

Description

technical field [0001] The invention relates to the preparation of a synthetic polymer-based nanofiber membrane by a freeze-drying method. Background technique [0002] Vacuum freeze-drying technology is to use the principle of ice crystal sublimation to remove the moisture in the pre-frozen material directly by sublimating into water vapor in the ice state without melting the ice, so as to obtain dry products. According to the phase equilibrium theory in chemical thermodynamics, it can be known that at a certain pressure and temperature, a certain phase equilibrium is reached among the three forms of water, and the phase diagram of water ( figure 1 ). The triple point shows the pressure and temperature conditions under which the gas, liquid and solid phases of water coexist. The OA line in the figure is the boundary line between the solid phase and the gas phase, called the sublimation line; the OB line is the boundary line between the liquid phase and the gas phase, call...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/66D01F6/20D01F6/14D01F6/18D01F6/70D01F6/62D01F6/22D01F6/16
Inventor 马贵平刘洋聂俊
Owner HANGZHOU INST OF ADVANCED MATERIAL BEIJING UNIV OF CHEM TECH
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