Polyimide nanofiber membrane with surface coated with nano titanium dioxide and preparation method for polyimide nanofiber membrane

A nano-titanium dioxide, nano-fiber membrane technology, applied in fiber processing, fiber chemical characteristics, spinning solution preparation, etc.

Inactive Publication Date: 2014-06-18
北京凯越嘉诚科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the present invention, polyamic acid or semi-cyclized polyimide fiber membranes are first prepared, and then heat-treated after dipping in titanium dioxide sol to obtain composite nanofibers coated with nano-titanium dioxide on the surface of the nanofibers. Research on membrane materials has not been reported

Method used

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  • Polyimide nanofiber membrane with surface coated with nano titanium dioxide and preparation method for polyimide nanofiber membrane
  • Polyimide nanofiber membrane with surface coated with nano titanium dioxide and preparation method for polyimide nanofiber membrane
  • Polyimide nanofiber membrane with surface coated with nano titanium dioxide and preparation method for polyimide nanofiber membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Preparation of PMDA / ODA system polyamic acid nanofiber membrane soaked in titanium dioxide sol diluted 3 times, dried, and thermal imidization to obtain polyimide and titanium dioxide composite nanofiber membrane. (1) Weigh 2.0g of pyromellitic dianhydride (PMDA) and 1.8g of 4,4`-diaminodiphenyl ether (ODA) with a molar ratio of 1:1, and dissolve all ODA in 30ml of N,N ‐Dimethylformamide (DMF) solvent, stirring mechanically, after ODA is completely dissolved in DMF, under the condition of ice-water bath, add PMDA step by step, after obtaining a polyamic acid solution with moderate viscosity, stir mechanically for 2 hours, then put The polyamic acid solution was put into a 20ml syringe, and the polyamic acid nanofiber film was prepared by electrospinning technology. The specific parameters of the electrospinning machine were spinning voltage: 15.34kV; spinning temperature: room temperature; spinning humidity: 30 %; Syringe needle diameter: No. 12; Receiving roller speed:...

Embodiment 2

[0035] Preparation of PMDA / 6FDA / ODA system polyamic acid nanofiber membrane soaked in 1-fold diluted titanium dioxide sol, dried, and thermal imidization to obtain polyimide and titanium dioxide composite nanofiber membrane. (1) Weigh 1.0g of pyromellitic dianhydride (PMDA), 2.1g of 4,4`-(hexafluoroethylene propylene) diphthalic anhydride (6FDA), 4,4` -Diaminodiphenyl ether (ODA) 1.9g, dissolve all ODA in 30ml of N,N‐dimethylformamide (DMF) solvent, stir mechanically, wait until ODA is completely dissolved in DMF, under the condition of ice water bath , first add 6FDA step by step, then add PMDA step by step, after obtaining a polyamic acid solution with moderate viscosity, after mechanical stirring for 2 hours, put the polyamic acid solution into a 20ml syringe, and use electrospinning technology to prepare polyamic acid Nanofiber membrane, electrospinning machine specific parameters are spinning voltage: 16.78kV; spinning temperature: room temperature; spinning humidity: 33%...

Embodiment 3

[0037] Preparation of 6FDA / ODA system polyamic acid nanofiber membrane soaked in 0-fold diluted titanium dioxide sol, dried, and thermal imidization to obtain a composite nanofiber membrane of polyimide and titanium dioxide. (1) Weigh 3.4g of 4,4`-(hexafluoroethylenepropylene) diphthalic anhydride (6FDA) and 1.5g of 4,4`-diaminodiphenyl ether (ODA) with a molar ratio of 1:1, and mix the ODA Dissolve all in 30ml of N,N‐dimethylformamide (DMF) solvent, stir mechanically, after ODA is completely dissolved in DMF, add 6FDA step by step under the condition of ice-water bath to obtain polyamic acid solution with moderate viscosity Finally, after mechanical stirring for 2 hours, the polyamic acid solution was put into a 20ml syringe, and the polyamic acid nanofiber film was prepared by electrospinning technology. The specific parameters of the electrospinning machine were spinning voltage: 17.62kV; spinning temperature : Room temperature; Spinning humidity: 35%; Syringe needle diamet...

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Abstract

The invention discloses a polyimide nanofiber membrane with the surface coated with nano titanium dioxide and a preparation method for the polyimide nanofiber membrane. The preparation method comprises the steps of synthesizing polyamide acid through diamine and binary anhydride to prepare a nanofiber membrane by an electrospinning technology, and then immersing the nanofiber membrane into titanium dioxide sol with different concentrations or partially cyclizing a polyamide acid nano fiber membrane, immersing the cyclized polyamide acid nano fiber membrane into the titanium dioxide sol, drying and preparing the polyimide nanofiber membrane with the surface coated with the nano titanium dioxide through gradient heating thermal imidization. The polyimide nanofiber composite membrane provided through the preparation method disclosed by the invention is formed by coating the surface of a polyimide nanofiber with titanium dioxide particles or a titanium dioxide layer; the particle size of the titanium dioxide particles is 10-150nm, and the titanium dioxide layer is 10-200nm; the diameter of the polyimide nanofiber is 30-600nm; the composite membrane is 10-90 microns thick; due to the coating of the titanium dioxide nano layer, the surface wettability, the size stability and the heat resistance performance of the polyimide nanofiber membrane are improved; the implementation process is simple and is easy to processize; the polyimide nanofiber membrane has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of polyimide nanofiber membranes, and in particular relates to a polyimide nanofiber membrane whose surface is coated with nano-titanium dioxide and a preparation method thereof. Background technique [0002] With the development and progress of science and technology, people's demand for materials is increasing, and various new materials continue to appear. Composite materials are a kind of composite material composed of two or more substances with different physical and chemical properties. phase solid material. Although its component materials remain relatively independent, its performance is not a simple summation of the properties of the component materials, but a combination of the advantages of each component material and plays a multi-functional role. [0003] Polymer-based composite materials are widely used in construction, chemistry, transportation, machinery and electrical appliances, electronic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728C08L79/08C08G73/10D01D1/02D01D5/00D01F1/10
Inventor 齐胜利牟洪伟刘丙学田国峰闫晓娜武德珍
Owner 北京凯越嘉诚科技发展有限公司
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