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Polyvinylidene fluoride nanocomposite material and its preparation method and application

A nano-composite material, polyvinylidene fluoride technology, applied in the direction of separation methods, chemical instruments and methods, and other chemical processes, can solve the problems of obtaining β phase, which is difficult to direct, etc., so as to improve the service life and simplify the power injection process Effect

Active Publication Date: 2019-12-13
北京中科艾加科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The direct crystallization from the molten state of PVDF is generally α phase, and it is difficult to directly obtain β phase by traditional techniques.

Method used

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  • Polyvinylidene fluoride nanocomposite material and its preparation method and application
  • Polyvinylidene fluoride nanocomposite material and its preparation method and application
  • Polyvinylidene fluoride nanocomposite material and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0065] Embodiment 1, preparation of β-phase polyvinylidene fluoride

[0066] Normally, PVDF is mainly α-phase. In this patent, graphene oxide microchips and PVDF powder are dissolved in N,N-dimethylformamide (DMF), stirred, ultrasonically dispersed, centrifuged, and the supernatant is obtained by filtration. The solution was cast on a flat glass sheet and cured in a vacuum oven at 70°C for 15 hours. The crystal structure of PVDF crystalline state before and after doping is tested by XRD to determine whether it is a β phase, such as Figure 4 shown. Usually, the XRD peaks of α-phase PVDF are 17.9°, 18.6°, and 20.3°, corresponding to crystal planes (020), (100) and (110), respectively. When the β-phase appears after the incorporation of graphene oxide, a new peak is added at 19.3°, and 2θ=19.3° corresponds to the crystal planes (110) and (200) of β-phase PVDF. The XRD diffraction peaks of PVDF films doped with GO changed, and with the increase of doping concentration, the pea...

Embodiment 2

[0067] Embodiment 2, the optimal content of nanomaterials and the phase transition temperature of composite materials in PVDF nanocomposites

[0068] Using differential scanning calorimeter to test the phase transition temperature of PVDF nanocomposites modified with different contents of graphene oxide, the results are as follows Figure 5 shown. Pure PVDF has only one phase transition peak, while the PVDF nanocomposites modified with graphene oxide nanosheets have two phase transition peaks, indicating that the modified PVDF nanocomposites have α-phase transitions. Combined with the results of XRD, it can be judged as the β phase with pyroelectric effect, and its corresponding phase transition temperature can be determined. As the content of nanomaterials increases, the strength of β phase increases obviously, but when the content increases to a certain value, the change is not obvious. Combined with the actual use conditions and the mechanical properties of the composite ...

Embodiment 3

[0069] Embodiment 3, PVDF nanocomposite pyroelectric effect

[0070] In order to characterize the pyroelectric effect of PVDF nanocomposites, it is necessary to measure the surface potential of PVDF film after temperature difference. In this embodiment, a template with a certain pattern is used to locally and selectively heat the PVDF film, so that the heated area appears electrical to the outside. The surface potential of the patterned and heated PVDF nanocomposite film (film thickness about 50nm) was measured by electrostatic force microscopy (EFM), as Figure 6 As shown, the heated area is positively charged to the outside, which proves the pyroelectric effect of PVDF nanocomposites under the action of temperature difference. Since the PVDF film used for EFM testing is thin, and its charge is positively correlated with the film thickness, the charge is relatively small.

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Abstract

The invention provides a polyvinylidene fluoride nanocomposite material and its preparation method and application. The polyvinylidene fluoride nanocomposite material is prepared from polyvinylidene fluoride and a surface carboxyl-modified nanocomposite material through compounding. The surface carboxyl-modified nanocomposite material comprises carboxylated graphene oxide and carboxylated carbon nanotubes. The invention discloses a use of the polyvinylidene fluoride nanocomposite material as an air filter material in adsorption of atmospheric particulates. A method for adsorption of atmospheric particulates comprises heating the PVDF nanocomposite material, placing the heated PVDF nanocomposite material in an atmospheric environment and carrying out adsorption of atmospheric particulates. The method further comprises regeneration of the PVDF nanocomposite material adsorbing the atmospheric particulates. Through use of the surface carboxyl-modified nano-filler in the PVDF, the carboxyl group in the surface carboxyl-modified nano-filler and >CF2 in the PVDF produce strong interaction so that the dipole moments of the PVDF molecular chain are arranged along a direction. The polyvinylidene fluoride nanocomposite material has a beta phase molecular structure so that PVDF has strong pyroelectric effects.

Description

technical field [0001] The invention belongs to the field of electret air purification, and in particular relates to a polyvinylidene fluoride nanocomposite material and a preparation method and application thereof. Background technique [0002] In recent years, the scope and severity of smog weather has intensified, which has seriously affected people's daily life and brought great harm to people's health, which has aroused widespread concern and attention from the society. Smog contains a large amount of harmful gases and fine suspended particles, which cause serious harm to the respiratory tract, cardiovascular system, and central nervous system of human respiratory immune function. Reducing the emission of suspended particles in the air is crucial to environmental protection and human health. important. Haze includes two meanings of fog and haze: fog is an aerosol system composed of a large number of tiny water droplets or ice crystals suspended in the air near the surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/34B03C3/00
Inventor 关丽郝建宇张美宁裘晓辉
Owner 北京中科艾加科技有限公司
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