CN102704190A - Method for preparing polyvinylidene fluoride and titanium dioxide (PVDF/TiO2) compounded nanofiber membrane - Google Patents
Method for preparing polyvinylidene fluoride and titanium dioxide (PVDF/TiO2) compounded nanofiber membrane Download PDFInfo
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- CN102704190A CN102704190A CN2011104503010A CN201110450301A CN102704190A CN 102704190 A CN102704190 A CN 102704190A CN 2011104503010 A CN2011104503010 A CN 2011104503010A CN 201110450301 A CN201110450301 A CN 201110450301A CN 102704190 A CN102704190 A CN 102704190A
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Abstract
The invention relates to a method for preparing a polyvinylidene fluoride and titanium dioxide (PVDF/TiO2) compounded nanofiber membrane. According to the preparing method, a sol-gel method, an electrostatic spinning method and a solvothermal method are combined. The prepared PVDF/TiO2 compounded nanofiber membrane has a relatively large specific surface area, and is high in photocatalytic activity and plasticity. By the method, the difficulty in the process of recycling titanium dioxide powder is overcome; simultaneously, a soft matrix is provided, and a titanium plate or conductive glass on which TiO2 grows is broken through. The PVDF/TiO2 compounded nanofiber membrane prepared by the electrostatic spinning method is a matrix for growth of TiO2 particles, and each nanofiber is provided with uniformly scattered TiO2 precursors; and after being treated by the solvothermal method for some time, the TiO2 particles can be uniformly distributed on each nanofiber for growth. According to the method, the technical process is simple, the quality is reliable, and the repeatability is high; and the prepared PVDF/TiO2 compounded nanofiber membrane can be widely applied to fields of photocatalysis and filtering and has a good market prospect.
Description
Technical field
The invention belongs to inorganic thin film material technology field, relate to the preparation of a kind of Kynoar/titanium dioxide composite nano fiber.
Background technology
Composite not only can improve the various aspects of performance of material as a kind of new material, can also give polymer composites new function, makes new material have more wide application space.
Kynoar (PVDF) is the copolymer of vinylidene fluoride homopolymer or vinylidene and other a small amount of fluorine-containing vinyl monomers.Except having good chemical resistance, heat-resisting quantity, weatherability (long-term serviceability temperature-70 ℃-150 ℃; Following its performance that do not change basically of long-term ultraviolet light 200nm-400nm irradiation), outside the anti-x radiation x performance; Also have properties such as piezoelectricity, dielectricity, pyroelectricity; Be that output is second largest product in the present fluoro-containing plastic, global annual production is above 4.3 ten thousand tons.It mainly uses petrochemical industry, electronic apparatus and the fluorocarbon coating three big fields of concentrating on.
Titanium dioxide is the inanimate matter photochemical catalyst that application potential is arranged up to now most; Nano titanium oxide has special skin effect, small-size effect and Kubo effect etc. because of it, organic pollution, degerming, the degraded water surface petroleum pollution of the processing, degraded that can effectively be applied to organic pollution in the liquid phase in the atmosphere, removes nitrogen oxide and deodorizing etc. in the air.In recent years because the nontoxic character and the cheapness of titanium dioxide also receive warm welcome on the carbon dioxide photo catalytic reduction.At present, main preparation methods has chemical precipitation method, sol-gel method, microemulsion, gas-phase reaction method etc.Utilize sol-gel technology like Gao Jiwei etc., adopt butyl titanate-absolute ethyl alcohol-hydrochloric acid system material, prepare and have the good light catalytic performance and get the titanium oxide crystal sol; F.-D.Duminica etc. utilize the AP-MOCVD method,, on stainless steel and silicon (110) substrate, deposit and have photocatalysis performance and hydrophilic TiO less than 420 ℃ in temperature
2Film (F.-D.Duminica, F.Maury and R.Hausbrand.Growth of TiO
2Thin films by AP-MOCVD on stainless steel substrates for photocatalytic applications.Surface and Coatings Technology.Surf.Coat.Technol. (2007), doi:10.1016/j.surfcoat.2007.04.011).
Carbon dioxide reduction generally on titanium dioxide semiconductor since broad stopband character to cause its conversion efficiency be very low, conventional solution be on semiconductor, carry out various metals nonmetallic substance mixes or deposition to change the original broad stopband character of titanium dioxide.Help separating the electron hole pair that the optoacoustic carrier produced and strengthen the performance of titanium dioxide through reducing energy gap or establishing a charge transfer center at carbon dioxide reduction.Because titanium dioxide nanoparticle is prone to reunite, many bibliographical informations utilize electro-conductive glass such as FTO or the titanium plate substrate [5,9] as the titanium dioxide nanostructure growth.These baseplate materials have lower flexibility and bigger weight, and therefore having limited to practical application has also increased cost of transportation.
The PVDF nano fibrous membrane not only has bigger specific area extraordinary flexibility is also arranged, and is light and can produce on a large scale.Though PVDF has very low Seebeck coefficient (0.24X10
-8P
TCoul/cm
2℃) but its dielectric constant has only 13 therefore relative big of power output.Cause the displacement of PVDF material crystalline phase to form electric charge at sunlight heat energy under irradiation, the negative ions individual separation has formed a built-in field, combines semi-conductive compound (titanium dioxide) that electron-hole pair is separated then.Built-in field has been separated the recombination probability that electron-hole pair helps to reduce electron-hole pair, has increased the life-span of electronics.These electronics that are activated carry out the reducing carbon dioxide molecule again and become combustion gas such as methane on every PVDF fiber surface.
Summary of the invention
The purpose of this invention is to provide Kynoar/titanium dioxide (PVDF/TiO with highlight catalytic active
2) preparation method of composite nano fiber.
The preparation method of a kind of Kynoar/titanium dioxide composite nano-fiber membrane may further comprise the steps:
1) 2～2.8g Kynoar is dissolved in the mixed solution of N-N dimethyl formamide that cumulative volume is 20ml and acetone; Add the 5g butyl titanate again and carry out magnetic agitation; Wherein butyl titanate and N-N dimethyl formamide mass ratio are 7: 3, stir to become the homogeneous precursor solution in 24 hours.
Described N-N dimethyl formamide and acetone volume ratio are 7: 3.
2) utilize electrostatic spinning apparatus, precursor solution is processed Kynoar/butyl titanate composite nano-fiber membrane.
3) after the drying Kynoar/butyl titanate composite nano-fiber membrane torn from aluminium-foil paper and carry out solvent heat treatment again, make the titanium dioxide growth, form Kynoar/titanium dioxide composite nano-fiber membrane.
The supply voltage of described electrostatic spinning apparatus is 18～20kV, and spinning head is 10～15cm with the distance that receives substrate, and feeding speed is 0.5～0.7ml/h.
The present invention prepares in the process, through changing the mass percent of butyl titanate, can change PVDF/TiO
2The photocatalysis performance of composite nano-fiber membrane.
Beneficial effect of the present invention is:
1. the present invention utilizes the PVDF/TiO of method of electrostatic spinning preparation
2Nano fibrous membrane obtains electric spinning diameter at 50～150nm.Because the tunica fibrosa specific area that electric spinning forms is bigger, thereby improves its photocatalytic activity greatly.
2. the PVDF/TiO that makes of the present invention
2Composite nano-fiber membrane, because to have combined to have plasticity strong, and the Kynoar of advantage such as high temperature resistant, it is high that this has just overcome pure titinium dioxide nanofiber fragility, the defective of easy fracture.
3. technical process of the present invention is simple, and reliable in quality is repeatable high.The PVDF/TiO that makes
2Compound submicron fiber film can be widely used in photocatalysis and filtration art, thereby makes it to have good market prospects.
Description of drawings
The butyl titanate electricity that Fig. 1-1 adds 5ml for the PVDF colloidal sol of 2.0g spin nanofiber at solvent heat treatment scanning electrograph not, its fiber diameter is 75.57nm;
The butyl titanate electricity that Fig. 1-2 adds 5ml for the PVDF colloidal sol of 2.2g spin nanofiber at solvent heat treatment sem photograph not, its fiber diameter is 155.30nm;
The butyl titanate electricity that Fig. 1-3 adds 5ml for the PVDF colloidal sol of 2.4g spin nanofiber at solvent heat treatment sem photograph not, its fiber diameter is 130.59nm;
The butyl titanate electricity that Fig. 1-4 adds 5ml for the PVDF colloidal sol of 2.6g spin nanofiber at solvent heat treatment sem photograph not, its fiber diameter is 154.25nm;
The butyl titanate electricity that Fig. 1-5 adds 5ml for the PVDF colloidal sol of 2.6g spin nanofiber at solvent heat treatment sem photograph not, its fiber diameter is 138.94nm.
Fig. 2-1 is 2gPVDF/TiO
2Nanofiber is at solvent heat treatment sem photograph after 6 hours;
Fig. 2-2 is 2gPVDF/TiO
2Nanofiber is at solvent heat treatment sem photograph after 9 hours;
Fig. 2-3 is 2gPVDF/TiO
2Nanofiber is at solvent heat treatment sem photograph after 12 hours;
Fig. 2-4 is 2gPVDF/TiO
2Nanofiber is at solvent heat treatment sem photograph after 15 hours.
Fig. 3 is PVDF/TiO
2Composite nano fiber light absorption figure.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
1) the 2g Kynoar is dissolved in the mixed solution of N-N dimethyl formamide that cumulative volume is 20ml and acetone; Add the 5g butyl titanate again and carry out magnetic agitation; Wherein butyl titanate and N-N dimethyl formamide mass ratio are 7: 3, stir to become the homogeneous precursor solution in 24 hours.
Described N-N dimethyl formamide and acetone volume ratio are 7: 3.
2) uniform solution that makes has the precursor solution (PVDF-Ti (OC of certain viscosity
4H
9)
4) in the plastic injector of the electrostatic spinning apparatus of packing into.
3) adjustment electrostatic spinning parameter is following: supply voltage 20kV, receive between substrate and the spinning head apart from 12cm, feeding speed 0.6ml/h obtains Kynoar/butyl titanate composite nano-fiber membrane.(seeing Fig. 1-1)
The composite cellulosic membrane that 4) will prepare through method of electrostatic spinning carries out solvent heat treatment to this composite membrane again after 80 ℃ of dryings: 90 ℃ of insulation 6h (seeing Fig. 2-1), 9h (seeing Fig. 2-2), 12h (seeing Fig. 2-3) and 15h (seeing Fig. 2-4) make titanium oxide formation particle.Form Kynoar/titanium dioxide composite nano-fiber membrane.
PVDF-TiO
2The light absorption detection method of nanofiber is following: with PVDF/TiO
2Nano fibrous membrane is put into and is carried out the light absorption test under the ultraviolet-visual spectrometer, and change absworption peak with optical wavelength and also changing, thus assessment PVDF/TiO
2The photocatalysis performance of nano fibrous membrane (like Fig. 3).
Instance 2
1) the 2.2g Kynoar is dissolved in the mixed solution of N-N dimethyl formamide that cumulative volume is 20ml and acetone; Add the 5g butyl titanate again and carry out magnetic agitation; Wherein butyl titanate and N-N dimethyl formamide mass ratio are 7: 3, stir to become the homogeneous precursor solution in 24 hours.
Described N-N dimethyl formamide and acetone volume ratio are 7: 3.
2) uniform solution that makes has the precursor solution (PVDF-Ti (OC of certain viscosity
4H
9)
4) in the plastic injector of the electrostatic spinning apparatus of packing into.
3) adjustment electrostatic spinning parameter is following: supply voltage 20kV, receive between substrate and the spinning head apart from 12cm, feeding speed 0.6ml/h obtains Kynoar/butyl titanate composite nano-fiber membrane.(seeing Fig. 1-2)
The composite cellulosic membrane that 4) will prepare through method of electrostatic spinning carries out solvent heat treatment to this composite membrane again after 80 ℃ of dryings: 90 ℃ of insulation 6h, 9h, 12h and 15h make titanium oxide form particle.Form Kynoar/titanium dioxide composite nano-fiber membrane.
PVDF-TiO
2The light absorption detection method of nanofiber is following: with PVDF/TiO
2Nano fibrous membrane is put into and is carried out the light absorption test under the ultraviolet-visual spectrometer, and change absworption peak with optical wavelength and also changing, thus assessment PVDF/TiO
2The photocatalysis performance of nano fibrous membrane (like Fig. 3).
Instance 3
1) the 2.4g Kynoar is dissolved in the mixed solution of N-N dimethyl formamide that cumulative volume is 20ml and acetone; Add the 5g butyl titanate again and carry out magnetic agitation; Wherein butyl titanate and N-N dimethyl formamide mass ratio are 7: 3, stir to become the homogeneous precursor solution in 24 hours.
Described N-N dimethyl formamide and acetone volume ratio are 7: 3.
2) uniform solution that makes has the precursor solution (PVDF-Ti (OC of certain viscosity
4H
9)
4) in the plastic injector of the electrostatic spinning apparatus of packing into.
3) adjustment electrostatic spinning parameter is following: supply voltage 20kV, receive between substrate and the spinning head apart from 12cm, feeding speed 0.6ml/h obtains Kynoar/butyl titanate composite nano-fiber membrane (seeing Fig. 1-3).
The composite cellulosic membrane that 4) will prepare through method of electrostatic spinning carries out solvent heat treatment to this composite membrane again after 80 ℃ of dryings: 90 ℃ of insulation 6h, 9h, 12h and 15h make titanium oxide form particle.Form Kynoar/titanium dioxide composite nano-fiber membrane.
PVDF-TiO
2The light absorption detection method of nanofiber is following: with PVDF/TiO
2Nano fibrous membrane is put into and is carried out the light absorption test under the ultraviolet-visual spectrometer, and change absworption peak with optical wavelength and also changing, thus assessment PVDF/TiO
2The photocatalysis performance of nano fibrous membrane (like Fig. 3).
Instance 4
1) the 2.6g Kynoar is dissolved in the mixed solution of N-N dimethyl formamide that cumulative volume is 20ml and acetone; Add the 5g butyl titanate again and carry out magnetic agitation; Wherein butyl titanate and N-N dimethyl formamide mass ratio are 7: 3, stir to become the homogeneous precursor solution in 24 hours.
Described N-N dimethyl formamide and acetone volume ratio are 7: 3.
2) uniform solution that makes has the precursor solution (PVDF-Ti (OC of certain viscosity
4H
9)
4) in the plastic injector of the electrostatic spinning apparatus of packing into.
3) adjustment electrostatic spinning parameter is following: supply voltage 20kV, receive between substrate and the spinning head apart from 12cm, feeding speed 0.6ml/h obtains Kynoar/butyl titanate composite nano-fiber membrane (seeing Fig. 1-4).
The composite cellulosic membrane that 4) will prepare through method of electrostatic spinning carries out solvent heat treatment to this composite membrane again after 80 ℃ of dryings: 90 ℃ of insulation 6h, 9h, 12h and 15h make titanium oxide form particle.Form Kynoar/titanium dioxide composite nano-fiber membrane.
PVDF-TiO
2The light absorption detection method of nanofiber is following: with PVDF/TiO
2Nano fibrous membrane is put into and is carried out the light absorption test under the ultraviolet-visual spectrometer, and change absworption peak with optical wavelength and also changing, thus assessment PVDF/TiO
2The photocatalysis performance of nano fibrous membrane (like Fig. 3).
Instance 5
1) the 2.8g Kynoar is dissolved in the mixed solution of N-N dimethyl formamide that cumulative volume is 20ml and acetone; Add the 5g butyl titanate again and carry out magnetic agitation; Wherein butyl titanate and N-N dimethyl formamide mass ratio are 7: 3, stir to become the homogeneous precursor solution in 24 hours.
Described N-N dimethyl formamide and acetone volume ratio are 7: 3.
2) uniform solution that makes has the precursor solution (PVDF-Ti (OC of certain viscosity
4H
9)
4) in the plastic injector of the electrostatic spinning apparatus of packing into.
3) adjustment electrostatic spinning parameter is following: supply voltage 20KV, receive between substrate and the spinning head apart from 12cm, feeding speed 0.6ml/h obtains Kynoar/butyl titanate composite nano-fiber membrane (seeing Fig. 1-5).
The composite cellulosic membrane that 4) will prepare through method of electrostatic spinning carries out solvent heat treatment to this composite membrane again after 80 ℃ of dryings: 90 ℃ of insulation 6h, 9h, 12h and 15h make titanium oxide form particle.Form Kynoar/titanium dioxide composite nano-fiber membrane.
PVDF-TiO
2The light absorption detection method of nanofiber is following: with PVDF/TiO
2Nano fibrous membrane is put into and is carried out the light absorption test under the ultraviolet-visual spectrometer, and change absworption peak with optical wavelength and also changing, thus assessment PVDF/TiO
2The photocatalysis performance of nano fibrous membrane (like Fig. 3).
Pure PVDF does not absorb the light (Pure PVDF) of any wave band basically.Without solvent heat treatment, along with the weight ratio of PVDF reduces, the intensity of absorption increases gradually.After the process solvent heat treatment, all samples show that all the same absorption spectrum is like (2g PVDF+5g butyl titanate (H)).But owing to select the minimum PVDF/TiO of diameter
2Sample to be reaching largest specific surface area, so sample is an optimum with the butyl titanate of 2gPVDF+5g.Therefore, this sample is elected next step experiment parameter as and is regulated and control power supply low pressure, receives distance and feeding speed between substrate and the spinning head.
Instance 6
1) the 2g Kynoar is dissolved in the mixed solution of N-N dimethyl formamide that cumulative volume is 20ml and acetone; Add the 5g butyl titanate again and carry out magnetic agitation; Wherein butyl titanate and N-N dimethyl formamide mass ratio are 7: 3, stir to become the homogeneous precursor solution in 24 hours.
Described N-N dimethyl formamide and acetone volume ratio are 7: 3.
2) uniform solution that makes has the precursor solution (PVDF-Ti (OC of certain viscosity
4H
9)
4) in the plastic injector of the electrostatic spinning apparatus of packing into.
3) adjustment electrostatic spinning parameter is following: supply voltage 18kV, receive between substrate and the spinning head apart from 12cm, feeding speed 0.6ml/h obtains Kynoar/butyl titanate composite nano-fiber membrane.
The composite cellulosic membrane that 4) will prepare through method of electrostatic spinning carries out solvent heat treatment to this composite membrane again after 80 ℃ of dryings: 90 ℃ of insulation 6h, 9h, 12h and 15h make titanium oxide form particle.Form Kynoar/titanium dioxide composite nano-fiber membrane.
PVDF-TiO
2The light absorption detection method of nanofiber is following: with PVDF/TiO
2Nano fibrous membrane is put into and is carried out the light absorption test under the ultraviolet-visual spectrometer, and change absworption peak with optical wavelength and also changing, thus assessment PVDF/TiO
2The photocatalysis performance of nano fibrous membrane.
Instance 7
1) 2 Kynoar is dissolved in the mixed solution of N-N dimethyl formamide that cumulative volume is 20ml and acetone; Add the 5g butyl titanate again and carry out magnetic agitation; Wherein butyl titanate and N-N dimethyl formamide mass ratio are 7: 3, stir to become the homogeneous precursor solution in 24 hours.
Described N-N dimethyl formamide and acetone volume ratio are 7: 3.
2) uniform solution that makes has the precursor solution (PVDF-Ti (OC of certain viscosity
4H
9)
4) in the plastic injector of the electrostatic spinning apparatus of packing into.
3) adjustment electrostatic spinning parameter is following: supply voltage 18kV, receive between substrate and the spinning head apart from 15cm, feeding speed 0.6ml/h obtains Kynoar/butyl titanate composite nano-fiber membrane.
The composite cellulosic membrane that 4) will prepare through method of electrostatic spinning carries out solvent heat treatment to this composite membrane again after 80 ℃ of dryings: 90 ℃ of insulation 6h, 9h, 12h and 15h make titanium oxide form particle.Form Kynoar/titanium dioxide composite nano-fiber membrane.
PVDF-TiO
2The light absorption detection method of nanofiber is following: with PVDF/TiO
2Nano fibrous membrane is put into and is carried out the light absorption test under the ultraviolet-visual spectrometer, and change absworption peak with optical wavelength and also changing, thus assessment PVDF/TiO
2The photocatalysis performance of nano fibrous membrane.
Instance 8
1) the 2g Kynoar is dissolved in the mixed solution of N-N dimethyl formamide that cumulative volume is 20ml and acetone; Add the 5g butyl titanate again and carry out magnetic agitation; Wherein butyl titanate and N-N dimethyl formamide mass ratio are 7: 3, stir to become the homogeneous precursor solution in 24 hours.
Described N-N dimethyl formamide and acetone volume ratio are 7: 3.
2) uniform solution that makes has the precursor solution (PVDF-Ti (OC of certain viscosity
4H
9)
4) in the plastic injector of the electrostatic spinning apparatus of packing into.
3) adjustment electrostatic spinning parameter is following: supply voltage 18kV, receive between substrate and the spinning head apart from 12cm, feeding speed 0.6ml/h obtains Kynoar/butyl titanate composite nano-fiber membrane.
The composite cellulosic membrane that 4) will prepare through method of electrostatic spinning carries out solvent heat treatment to this composite membrane again after 80 ℃ of dryings: 90 ℃ of insulation 6h, 9h, 12h and 15h make titanium oxide form particle.Form Kynoar/titanium dioxide composite nano-fiber membrane.
PVDF-TiO
2The light absorption detection method of nanofiber is following: with PVDF/TiO
2Nano fibrous membrane is put into and is carried out the light absorption test under the ultraviolet-visual spectrometer, and change absworption peak with optical wavelength and also changing, thus assessment PVDF/TiO
2The photocatalysis performance of nano fibrous membrane.
Instance 9
1) the 2g Kynoar is dissolved in the mixed solution of N-N dimethyl formamide that cumulative volume is 20ml and acetone; Add the 5g butyl titanate again and carry out magnetic agitation; Wherein butyl titanate and N-N dimethyl formamide mass ratio are 7: 3, stir to become the homogeneous precursor solution in 24 hours.
Described N-N dimethyl formamide and acetone volume ratio are 7: 3.
2) uniform solution that makes has the precursor solution (PVDF-Ti (OC of certain viscosity
4H
9)
4) in the plastic injector of the electrostatic spinning apparatus of packing into.
3) adjustment electrostatic spinning parameter is following: supply voltage 18kV, receive between substrate and the spinning head apart from 12cm, feeding speed 0.5ml/h obtains Kynoar/butyl titanate composite nano-fiber membrane.
The composite cellulosic membrane that 4) will prepare through method of electrostatic spinning carries out solvent heat treatment to this composite membrane again after 80 ℃ of dryings: 90 ℃ of insulation 6h, 9h, 12h and 15h make titanium oxide form particle.Form Kynoar/titanium dioxide composite nano-fiber membrane.
PVDF-TiO
2The light absorption detection method of nanofiber is following: with PVDF/TiO
2Nano fibrous membrane is put into and is carried out the light absorption test under the ultraviolet-visual spectrometer, and change absworption peak with optical wavelength and also changing, thus assessment PVDF/TiO
2The photocatalysis performance of nano fibrous membrane.
Instance 10
1) the 2g Kynoar is dissolved in the mixed solution of N-N dimethyl formamide that cumulative volume is 20ml and acetone; Add the 5g butyl titanate again and carry out magnetic agitation; Wherein butyl titanate and N-N dimethyl formamide mass ratio are 7: 3, stir to become the homogeneous precursor solution in 24 hours.
Described N-N dimethyl formamide and acetone volume ratio are 7: 3.
2) uniform solution that makes has the precursor solution (PVDF-Ti (OC of certain viscosity
4H
9)
4) in the plastic injector of the electrostatic spinning apparatus of packing into.
3) adjustment electrostatic spinning parameter is following: supply voltage 18kV, receive between substrate and the spinning head apart from 12cm, feeding speed 0.7ml/h obtains Kynoar/butyl titanate composite nano-fiber membrane.
The composite cellulosic membrane that 4) will prepare through method of electrostatic spinning carries out solvent heat treatment to this composite membrane again after 80 ℃ of dryings: 90 ℃ of insulation 6h, 9h, 12h and 15h make titanium oxide form particle.Form Kynoar/titanium dioxide composite nano-fiber membrane.
PVDF-TiO
2The light absorption detection method of nanofiber is following: with PVDF/TiO
2Nano fibrous membrane is put into and is carried out the light absorption test under the ultraviolet-visual spectrometer, and change absworption peak with optical wavelength and also changing, thus assessment PVDF/TiO
2The photocatalysis performance of nano fibrous membrane.
Claims (2)
1. the preparation method of Kynoar/titanium dioxide composite nano-fiber membrane is characterized in that this method may further comprise the steps:
1) 2～2.8g Kynoar is dissolved in the mixed solution of N-N dimethyl formamide that cumulative volume is 20ml and acetone; Add the 5g butyl titanate again and carry out magnetic agitation; Wherein butyl titanate and N-N dimethyl formamide mass ratio are 7:3, stir to become the homogeneous precursor solution in 24 hours;
Described N-N dimethyl formamide and acetone volume ratio are 7:3;
2) utilize electrostatic spinning apparatus, precursor solution is processed Kynoar/butyl titanate composite nano-fiber membrane;
3) after the drying Kynoar/butyl titanate composite nano-fiber membrane torn from aluminium-foil paper and carry out solvent heat treatment again, make the titanium dioxide growth, form Kynoar/titanium dioxide composite nano-fiber membrane.
2. the preparation method of Kynoar according to claim 1/titanium dioxide composite nano-fiber membrane; It is characterized in that: the supply voltage of electrostatic spinning apparatus is 18～24kV; Spinning head is 10～15cm with the distance that receives substrate, and feeding speed is 0.5～0.7ml/h.
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