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PI& graphene oxide composite nanofiber film preparation method

A composite technology of nanofiber membrane and graphene, applied in the direction of graphene, chemical instruments and methods, nanocarbon, etc., can solve the problems of small pores and low tensile strength of PI nanofiber membrane

Active Publication Date: 2017-10-20
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on this, the present invention provides a material based on PI nanofiber membrane, which solves the problem of low tensile strength of PI nanofiber membrane, and retains the advantages of its small pores, which can effectively prevent fogging as a mask material Haze PM2.5

Method used

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  • PI& graphene oxide composite nanofiber film preparation method
  • PI& graphene oxide composite nanofiber film preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of PI spinning solution

[0024] Dissolve 1g of PI in DMF to make a 10ml solution, and adjust the pH of the solution to 6; make 0.2g of sodium lauryl sulfate into a 10ml solution; take 10ml of sodium lauryl sulfate solution and add it dropwise to the PI solution; After the addition, put it in an oil bath at 90°C for 1 hour.

[0025] (2) Preparation of small-sheet graphene oxide

[0026] Add 1g of expandable natural graphite powder with a particle size of 100nm to 100ml of concentrated sulfuric acid, then slowly add 50ml of fuming nitric acid, stir in an ice bath for 24 hours, then pour into 1000ml of deionized water to dilute, filter and wash with water, and store at 50°C Dry for 24 hours, then expand in microwave at 1000w for 1min to obtain expanded graphite; take the above-mentioned expanded graphite and add it to 300ml of concentrated sulfuric acid, then add 4.2g of potassium persulfate and 6g of phosphorus pentoxide, stir at 80°C for 5h, then pour i...

Embodiment 2

[0032] (1) Preparation of PI aqueous solution

[0033] Dissolve 3g of PI in DMF to make a 20ml solution, and adjust the pH of the solution to 6; make 0.6g of sodium lauryl sulfate into a 10ml solution; take 10ml of sodium lauryl sulfate solution and add it dropwise to the PI solution; After the addition is complete, put it in an oil bath and react at 100°C for 0.5h.

[0034] (2) Preparation of small-sheet graphene oxide

[0035] Add 2g of expandable natural graphite powder with a particle size of 200nm to 200ml of concentrated sulfuric acid, then slowly add 75ml of fuming nitric acid, stir in an ice bath for 24 hours, pour into 1500ml of deionized water to dilute, filter and wash with water, and put Dry for 24 hours, then expand in microwave for 2 minutes at 1000w to obtain expanded graphite; take the above-mentioned expanded graphite and add it to 400ml of concentrated sulfuric acid, then add 6g of potassium persulfate and 8g of phosphorus pentoxide, stir at 80°C for 8h, and...

Embodiment 3

[0040] (1) Preparation of PI aqueous solution

[0041] Dissolve 5g of PI in DMF to make a 40ml solution, and adjust the pH of the solution to 6; make 1g of sodium lauryl sulfate into a 20ml solution; take 20ml of sodium lauryl sulfate solution and add it dropwise to the PI solution; add dropwise After completion, put it in an oil bath at 95°C for 1 hour.

[0042] (2) Preparation of small-sheet graphene oxide

[0043] Add 5g of expandable natural graphite powder with a particle size of 300nm to 350ml of concentrated sulfuric acid, then slowly add 100ml of fuming nitric acid, stir in an ice bath for 48 hours, pour into 2000ml of deionized water to dilute, filter and wash with water, and put Dry for 24 hours, then expand in microwave for 5 minutes at 1000w to obtain expanded graphite; take the above-mentioned expanded graphite and add it to 500ml of concentrated sulfuric acid, then add 8g of potassium persulfate and 10g of phosphorus pentoxide, stir at 80°C for 10h, and then pour ...

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Abstract

The invention belongs to the field of PI nanofiber film preparation, and particularly relates to a PI& graphene oxide composite nanofiber film preparation method. The method includes: a step a, preparation of a PI spinning solution: dissolving PI and a surfactant in the same organic solvent, adjusting the pH of the PI solution to be acidic, adding the surfactant solution into the PI solution, performing reaction at the temperature of 80-100 DEG C for 0.5-1.5 hours to acquire the PI spinning solution; a step b, preparation of small lamellar graphene oxide: using nano-graphite as a raw material, performing gradual oxidization through concentrated sulfuric acid, fuming nitric acid and potassium permanganate, and acquiring a graphene oxide dispersion liquid through centrifugation and washing; a step c, preparation of a composite spinning solution: mixing products acquired from the step a and the step b to acquire the composite spinning solution; a step d, acquisition of the composite nanofiber film through spinning. The prepared nanofiber film is fine in diameter, is small in hole, is excellent in tensile strength, has better filtering performance than the conventional nonwoven fabric filter films, and can effectively prevent suction of PM 2.5.

Description

technical field [0001] The invention belongs to the technical field of nanofiber membranes, in particular to a preparation method of PI&graphene oxide composite nanomaterials. Background technique [0002] Haze weather is a state of air pollution. Haze is a general expression of the excessive content of various suspended particulate matter in the atmosphere, especially PM2.5 (particulate matter with an aerodynamic equivalent diameter less than or equal to 2.5 microns) is considered to cause haze. The "culprit" of the weather. Along with the deterioration of air quality, increasing appears in the phenomenon of cloudy weather, and harm increases the weight of. In many areas of China, the haze weather phenomenon is incorporated into fog as a disastrous weather warning and forecast. [0003] Wearing a mask is currently a common protective method for people who need to go out, but not all masks can effectively block the haze PM2.5. At present, the domestically produced masks o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H3/005C01B32/198C01B32/184
CPCC01P2004/03D04H3/005
Inventor 闵永刚惠志清马素萍邓云凯崔岱麒
Owner NANJING UNIV OF POSTS & TELECOMM
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