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Preparation method of nanofibrous membrane

A nanofiber membrane, nanofiber technology, applied in fiber processing, textiles and papermaking, non-woven fabrics, etc., can solve the problems of limited application, secondary pollution, poor strength, etc.

Active Publication Date: 2017-11-14
江苏八达科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these fibers have the disadvantages of poor stability, poor strength, and easy to produce secondary pollution.
Moreover, the biggest obstacle of poor flexibility and poor strength of inorganic fibers severely limits their practical application.

Method used

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  • Preparation method of nanofibrous membrane
  • Preparation method of nanofibrous membrane
  • Preparation method of nanofibrous membrane

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Experimental program
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Embodiment Construction

[0034] A method for preparing a high-strength superhydrophobic and superoleophilic nanofiber membrane, comprising the following process steps:

[0035] (1) Synthesis of polyamic acid:

[0036] Add 2.9422 g of biphenyltetracarboxylic dianhydride (BPDA) and 1.0814 g of p-phenylenediamine (PDA) respectively (molar ratio 1:1) into a dry four-necked flask equipped with a mechanical stirrer, a thermometer, and a nitrogen gas inlet and outlet tube, and mix well ; Under strong mechanical stirring, add 40ml DMAc, react at -15°C-5°C for 24 hours, and then end the reaction to obtain polyamic acid;

[0037] (2) Preparation of polyamic acid (PAA) nanofiber membrane:

[0038] Use 1-5% (wt) PAA DMAc solution to spin in a high-voltage electrostatic field with a voltage of 30Kv (+20, -10KV), the receiving distance from the needle tip of the syringe to the flywheel is 10-15cm, and the speed of the flywheel is 1000- 2000 rev / min, the speed of electrospinning is 0.5-1ml / h, spins into polyamic a...

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Abstract

The present invention is a preparation method of nanofiber membrane, comprising: (1) synthesizing polyamic acid; (2) preparing polyamic acid (PAA) nanofiber membrane; (3) preparing polyamic acid nanofiber membrane and imidizing it into polyimide Amine membrane; (4) Preparation of CA nanofiber membrane; (5) Coaxial electrospun cellulose acetate-polyamic acid; (6) Imidization of CA-PAA nanofiber membrane: (7) Synthesis of benzoxazine monomer ; (8) CA, PI, CA‑PI nanofiber membranes cured in situ by benzoxazine; (9) CA, PI, CA‑PI nanofiber membranes cured by benzoxazine / silica in situ. Advantages: CA-PI nanofiber membranes with biodegradability, low cost and significant mechanical strength are obtained; functional fiber membrane materials are obtained by modifying the surface of the fiber membranes; this high-strength hydrophobic membrane material is used in oil-water separation, It has broad application prospects in sewage treatment and deep sea oil spills.

Description

technical field [0001] The invention relates to a method for preparing a nanofiber membrane, in particular to a method for preparing a high-strength superhydrophobic and superoleophilic nanofiber membrane used for gravity-driven oil-water separation. Background technique [0002] By electrospinning, many literatures on nanofibrous membranes such as polystyrene, polycaprolactone, polymethyl methacrylate, polyurethane, and inorganic silica fibers have been reported. However, these fibers have the disadvantages of poor stability, poor strength, and easy to produce secondary pollution. Moreover, the biggest obstacle of poor flexibility and poor strength of inorganic fibers seriously limits their practical application. Contents of the invention [0003] The present invention proposes a method for preparing a high-strength superhydrophobic and superoleophilic nanofiber membrane used for gravity-driven oil-water separation. Its purpose is to overcome the above-mentioned defects ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/728D04H1/42D04H1/4334D01D5/00
Inventor 黄超伯马文静刘中车郭中富华大威陈鄞琛
Owner 江苏八达科技股份有限公司