Bead-like porous PLA (Poly Lactic Acid) nano fiber as well as preparation method and application thereof

A nanofiber and bead-like technology, which is applied in the field of beaded porous PLA nanofiber and its preparation, to achieve the effects of facilitating circulation, reducing filling rate, and simplifying the preparation process

Active Publication Date: 2014-07-30
江苏正大易方科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the preparation of PLA beaded porous nanofibers by electrospinning and their application in air filter materials

Method used

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  • Bead-like porous PLA (Poly Lactic Acid) nano fiber as well as preparation method and application thereof
  • Bead-like porous PLA (Poly Lactic Acid) nano fiber as well as preparation method and application thereof
  • Bead-like porous PLA (Poly Lactic Acid) nano fiber as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1: a kind of preparation method of beaded porous PLA nanofiber, its steps are as follows:

[0038] 1) Preparation of spinning solution

[0039] Mix dichloromethane and N,N-dimethylacetamide in a mass ratio of 10:1 as a mixed solvent, weigh 0.5 g of PLA polymer particles and dissolve them in 9.5 g of the above mixed solvent, and then Under stirring with a magnetic stirrer, a uniformly mixed transparent solution (spinning solution) with a mass fraction of 5% was prepared.

[0040] 2) Preparation of beaded porous PLA nanofiber air filtration membrane

[0041] The spinning solution prepared in step 1) is subjected to electrospinning, and the process conditions of electrospinning are as follows:

[0042] Electrospinning was carried out under the conditions of spinning voltage of 15kV, spinning liquid flow rate of 1ml / h, collection roller speed of 5.5m / min, and spinning distance of 12cm.

[0043] The conventional horizontal electrospinning method is adopted, and t...

Embodiment 2

[0047] Embodiment 2: a kind of preparation method of beaded porous PLA nanofiber, its steps are as follows:

[0048] 1) Preparation of spinning solution

[0049] Dichloromethane and N,N-dimethylacetamide are mixed in a mass ratio of 10:1 as a mixed solvent, and 0.45g of PLA polymer particles are weighed, dissolved in 9.55g of the mixed solvent, and then A homogeneously mixed transparent solution (spinning solution) with a mass fraction of 4.5% was prepared by stirring with a magnetic stirrer at room temperature.

[0050] 2) Preparation of beaded porous PLA nanofiber air filtration membrane

[0051] The spinning solution prepared in step 1) is subjected to electrospinning, and the process conditions of electrospinning are as follows:

[0052] Electrospinning was carried out under the conditions of a spinning voltage of 15kV, a spinning solution flow rate of 1ml / h, a collection roller speed of 5.5m / min, and a spinning distance of 12cm.

[0053] The conventional horizontal ele...

Embodiment 3

[0056] Embodiment 3: a kind of preparation method of beaded porous PLA nanofiber, its steps are as follows:

[0057] 1) Preparation of spinning solution

[0058] Mix dichloromethane and N,N-dimethylacetamide in a mass ratio of 10:1 as a mixed solvent, weigh 0.55g of PLA polymer particles and dissolve them in 9.45g of mixed solvent, and then pass through Stirring with a magnetic stirrer prepared a homogeneously mixed transparent solution (spinning solution) with a mass fraction of 5.5%.

[0059] 2) Preparation of beaded porous PLA nanofiber air filtration membrane

[0060] The spinning solution prepared in step 1) is subjected to electrospinning, and the process conditions of electrospinning are as follows:

[0061] Electrospinning was carried out under the conditions of spinning voltage 15kV, spinning solution flow rate 1ml / h, collection roller speed 5.5m / min, and spinning distance 12cm.

[0062] The conventional horizontal electrospinning method is adopted, and the convent...

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Abstract

The invention discloses a bead-like porous PLA (Poly Lactic Acid) nano fiber which is characterized in that pearls in the bead-like porous PLA nano fiber accounts for 8.0-22% of the area of the bead-like porous PLA nano fiber and the geometrical dimensions of stringed beads are as follows: the pearls have the mean area of 10-80mu m <2> and the length-width ratio of 2-4; the average diameter of fibers for connecting the beads is 100-800nm; the surface pore coverage rate of the beads is 3-30%. Due to the bead-shaped porous structure and the nano porous fibers for connecting the beads, the bead-like porous PLA nano fiber has high specific surface area, and high surface energy is provided for absorbing micro particles; meanwhile, the bead-like porous PLA nano fiber is beneficial to gas circulation, the air filtration resistance is reduced, especially the air filtratione efficiency for micro particles with the mass median diameter of 75nm is 99.9-99.999%, and the average filtration resistance is 120-360 Pa. The invention also provides a preparation method of the bead-like porous PLA nano fiber and application of the bead-like porous PLA nano fiber serving as an air filtration film.

Description

technical field [0001] The invention relates to a beaded porous PLA nanofiber, a preparation method and application thereof. Background technique [0002] Electrospinning technology is a simple and efficient method for preparing ultrafine fibers. The principle is mainly to use a high-voltage electric field to charge the solution to generate an electric field force, overcome the surface tension of the polymer solution, and form a Taylor cone at the injection port, and then the polymer solution is stretched under the action of the electric field force, and the solvent is volatilized. Nanoscale fibers are obtained on the collection screen. Because this technology has the advantages of simple device and low price, researchers at home and abroad have used this spinning method to prepare hundreds of various electrospun nanofiber materials in recent years. [0003] Nanofibers with a beaded porous structure have a large number of tiny pores on the surface of the beads and a small ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/20D01D5/00D01F6/62B01D71/48B01D53/22
Inventor 潘志娟王哲
Owner 江苏正大易方科技有限公司
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