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A kind of multilayer polymer nanocomposite material and preparation method thereof

A nanocomposite material and nanocomposite technology, applied in the field of multilayer polymer nanocomposite materials and their preparation, can solve problems such as difficult preparation of composite films, defects, and difficulty in accurately controlling the thickness of composite layers

Active Publication Date: 2020-11-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this microlayer coextrusion method is difficult to prepare composite multilayer materials with added nanoparticles, because it is difficult for polymers to be well and uniformly dispersed with fillers—especially small-sized nanoparticles—in the molten state.
However, the above-mentioned method for preparing sandwich structure composite materials is generally a solution casting method, which is difficult to obtain a composite material with a multilayer (more than five layers) structure on a large scale within a certain thickness (about 10 microns).
Because the solution casting method is difficult to prepare a composite film with a thickness of less than 2 microns and a uniform thickness
At the same time, using the solution casting method, incomplete interface contact, defects, pores, and unevenness are prone to occur inside the composite material, which affects the dielectric properties of the composite material.
Finally, the solution casting method is also difficult to precisely control the thickness of each layer of the composite layer, especially with the method of layer-by-layer scraping

Method used

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  • A kind of multilayer polymer nanocomposite material and preparation method thereof
  • A kind of multilayer polymer nanocomposite material and preparation method thereof
  • A kind of multilayer polymer nanocomposite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Embodiment 1, preparation multilayer polymer nanocomposite material

[0074] according to figure 1 The flow diagram shown in the figure prepares formal 4-layer, formal 8-layer and formal 16-layer polymer nanocomposites respectively, and the specific steps are as follows:

[0075] (1) Measure 1 g of polymer P(VDF-HFP) (molecular weight: 470,000), add it to a mixed solvent of 3 mL of DMF and 2 mL of acetone, and stir until a stable sol is obtained to obtain precursor sol A.

[0076] (2) Measure 1g of polymer P(VDF-HFP) (molecular weight is 470,000), add it to a mixed solvent of 3mL of DMF and 2ml of acetone, and stir until a stable sol is obtained to obtain a precursor sol; BaTiO 3 Nanoparticles were added to the above P(VDF-HFP) sol to prepare BaTiO 3 Nanoparticle / P (VDF-HFP) sol, stir evenly and to stable state, obtain precursor sol B (in the gained precursor sol, the mass concentration of polymer P (VDF-HFP) is 20%; BaTiO 3 The adding amount of nanoparticles is cont...

Embodiment 2

[0083] Embodiment 2, preparation multilayer polymer nanocomposite material

[0084] according to figure 1 The schematic flow chart shown in the preparation of trans 4-layer, trans 8-layer and trans 16-layer polymer nanocomposites respectively, the specific steps are as follows:

[0085] (1) Measure 1 g of polymer P(VDF-HFP) (molecular weight: 470,000), add it to a mixed solvent of 3 mL of DMF and 2 mL of acetone, and stir until a stable sol is obtained to obtain precursor sol A.

[0086] (2) Measure 1g of polymer P(VDF-HFP) (molecular weight is 470,000), add it to a mixed solvent of 3mL of DMF and 2ml of acetone, and stir until a stable sol is obtained to obtain a precursor sol; BaTiO 3 Nanoparticles were added to the above P(VDF-HFP) sol to prepare BaTiO 3 Nanoparticle / P (VDF-HFP) sol, stir evenly and to stable state, obtain precursor sol B (in the gained precursor sol, the mass concentration of polymer P (VDF-HFP) is 20%; BaTiO 3 The amount of nanoparticles added is contr...

Embodiment 3

[0093] Embodiment 3, preparation polymer nanocomposite material

[0094] Prepare polymer nanocomposites according to the following steps:

[0095] (1) Measure 1 g of polymer P(VDF-HFP) (molecular weight: 470,000), add it to a mixed solvent of 3 mL of DMF and 2 mL of acetone, and stir until a stable sol A is formed.

[0096](2) Measure 1g of polymer P(VDF-HFP) (molecular weight is 470,000), add it to a mixed solvent of 3mL of DMF and 2ml of acetone, and stir until a stable sol is obtained to obtain a precursor sol; BaTiO 3 Nanoparticles were added to the above P(VDF-HFP) sol to prepare BaTiO 3 Nanoparticles / P (VDF-HFP) sol, stir evenly to steady state, obtain precursor sol C (in the gained precursor sol, the mass concentration of polymer P (VDF-HFP) is 20%; BaTiO 3 The amount of nanoparticles added is controlled in the final composite material BaTiO 3 The volume fraction of nanoparticles is 5%).

[0097] (3) Measure 1g of polymer P(VDF-HFP) (molecular weight is 470,000), ad...

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Abstract

The invention discloses a multilayer polymer nanocomposite and a preparation method thereof. The preparation method comprises the following steps that (1) composite non-woven fabric with a layered structure is prepared by adopting an electrostatic spinning method, wherein the composite non-woven fabric comprises a polymer nano composite layer, polymer nano fibers forming the polymer nano compositelayer take polymers as a main body fiber framework, and nano fillers are dispersed in the main body fibers; and (2) and hot pressing and heat treatment are carried out on the composite non-woven fabric in sequence so as to obtain the multilayer polymer nanocomposite. According to the multilayer polymer nanocomposite and the preparation method thereof, the preparation of a multilayer level structure composite material is realized, the inner fillers of the composite material are uniformly dispersed, the layer level structure is obvious, the interface is clear and complete, the contact is tight,the number of layers of the composite material and the thickness of the single layer are fine and controllable within a large range, and meanwhile, the multilayer composite material has excellent dielectric property and quite high performance stability.

Description

technical field [0001] The invention belongs to the technical field of electronic composite material preparation, and in particular relates to a multilayer polymer nanocomposite material and a preparation method thereof. Background technique [0002] With the development of modern technology, as an important basic electronic component and high-power energy storage device, capacitors are widely used in consumer electronics, communication products, automation control, high-speed railways, new energy vehicles, aviation and military equipment . In 2016, the sales revenue of my country's capacitor industry reached nearly 50 billion yuan. Among them, ceramic capacitors, aluminum / tantalum electrolytic capacitors and film capacitors account for more than 90% of the capacitor market. In recent years, electronic devices and energy storage devices are gradually developing in the direction of miniaturization, flexibility and environmental protection. The core material of ceramic capa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C70/30B29C70/54B29C71/02
CPCB29C70/30B29C70/54B29C71/02B29C2071/025
Inventor 沈洋江建勇但振康林元华南策文
Owner TSINGHUA UNIV