Two-dimensional nanosheet-polymer flexible composite film and preparation method thereof

A two-dimensional nano-composite thin film technology, which is applied in the field of dielectric composite material manufacturing, can solve the problems of reduced breakdown field strength of composite thin films and reduced flexibility of composite materials, and achieve excellent mechanical and electrical properties, high dielectric constant, The effect of improving the breakdown field strength

Active Publication Date: 2019-05-17
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are obvious problems in this solution. A higher amount of inorganic ceramic particles is required to increase the dielectric constant of the composite material. The volume fraction of inorganic ceramic particles is generally greater than 50%, which will greatly reduce the flexibility of the composite material.
In addition, the addition of too many inorganic components will cause defects and reduce the breakdown field strength of the composite film

Method used

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  • Two-dimensional nanosheet-polymer flexible composite film and preparation method thereof
  • Two-dimensional nanosheet-polymer flexible composite film and preparation method thereof
  • Two-dimensional nanosheet-polymer flexible composite film and preparation method thereof

Examples

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Embodiment 1

[0031] Example 1, see Figure 1 to Figure 4 :

[0032] The invention provides a two-dimensional nanosheet-polymer flexible composite film, and a preparation method comprising the following steps:

[0033] 1) Preparation of HCa with perovskite structure 2 Nb 3 o 10 Two-dimensional nanosheets:

[0034] a) Weigh 1.4558g potassium carbonate (K 2 CO 3 ), 4.0164g calcium carbonate (CaCO 3 ) and 8.000g niobium pentoxide (Nb 2 o 5 ) was ground in an agate mortar for 60 min, and then calcined in a high temperature furnace at 1200 °C for 12 h to obtain KCa 2 Nb 3 o 10 sample;

[0035] b) Weigh 2.5g of synthetic KCa 2 Nb 3 o 10 Powder is placed in the Erlenmeyer flask that 100ml nitric acid (5mol / L) is housed, and Erlenmeyer flask is fixed on the vibration 72h on the small shaker, after proton exchange reaction finishes, filter, the sample that obtains is washed with ultrapure water (resistivity greater than 18MΩ) to wash off the residual nitric acid on the surface, and o...

Embodiment 2

[0040] Example 2, see figure 2 :

[0041] The raw materials and preparation process of this embodiment are basically the same as in Example 1, the difference is that in step d), 2ml of the emulsion after the stripping of the two-dimensional nanosheets is measured, and the finished product is a two-dimensional nanosheet with a filler of 2%. Nanosheet-polymer flexible composite films.

Embodiment 3

[0049] The raw materials and preparation process of this example are basically the same as those of Example 1, except that the polymer is PVDF-HFP.

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Abstract

The invention provides a two-dimensional nanosheet-polymer flexible composite film and a preparation method thereof. The two-dimensional nanosheet-polymer flexible composite film is prepared from a two-dimensional nanosheet and a polymer matrix, the two-dimensional nanosheet is prepared from any one or more materials in a (Ca, Sr)2(Nb, Ta)3O10 system with a perovskite structure, and the polymer isprepared from any one or more materials of polyvinylidene fluoride, polyvinylidene fluoride-trifluoroethylene, polyvinylidene fluoride-hexafluoropropylene, epoxy resin, polypropylene and polyimide; and the preparation method comprises the preparation process that a KCa2Nb3O10 material is synthesized in a high-temperature sintering mode; an HCa2Nb3O10.1.5H2O material is synthesized through a proton-exchange reaction; the HCa2Nb3O10.1.5H2O material is stripped into the two-dimensional nanosheet; and then a flexible composite film product is prepared through a tape casting method. By adding thetwo-dimensional nanosheet into the polymer matrix, a polymer matrix composite with excellent performance is obtained at the low inorganic matter additive amount, thus the good flexibility of the polymer matrix of the polymer matrix composite is retained, and the breakdown field strength of the composite film is improved.

Description

technical field [0001] The invention relates to the technical field of dielectric composite material manufacturing, in particular to a two-dimensional nanosheet-polymer flexible composite film and a preparation method thereof. Background technique [0002] With the rapid development of high-tech industries such as the Internet of Things, big data, new energy vehicles, and smart terminals, the global capacitor market has achieved rapid growth, expanding from $17.3 billion in 2012 to $20.9 billion in 2017. According to the requirements of different application scenarios, capacitors with different dielectric materials have also been derived. Now ceramic capacitors, aluminum electrolytic capacitors, tantalum electrolytic capacitors and film capacitors are widely used in the market. Ceramic dielectric is widely used because of its high dielectric constant, but its disadvantages such as high brittleness, high loss, and inability to be used in printed circuit boards (PCB) cannot be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/16C08L63/00C08L23/12C08K7/00C08K3/22C08J5/18
Inventor 何亮汪聪李宝文
Owner WUHAN UNIV OF TECH
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