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A kind of composite material and its preparation method and application

A composite material, melt blending technology, used in fixed capacitor parts, multilayer capacitors, thin film/thick film capacitors, etc. problems, such as poor blending effect of polypropylene and polyvinylidene fluoride, etc., to achieve the effect of improving the dielectric constant

Active Publication Date: 2021-08-31
TSINGHUA UNIV +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Film capacitors made of biaxially oriented polypropylene are important electrical and electronic components and are widely used in many fields. They can play the role of filtering, smoothing and rectification, and can also be used as DC supports, but their low dielectric constant ( ~2.2) It limits its capacitance per unit volume and energy storage characteristics. The excessive volume of film capacitors has become an obstacle to the further development of electronic and electrical systems. Therefore, it is imperative to promote the miniaturization of capacitors.
[0003] At present, one of the main research directions to improve the dielectric constant of dielectric materials is to add inorganic nanoparticles, but the easy agglomeration of inorganic nanoparticles and poor compatibility with the polymer matrix make the processing performance of inorganic nanoparticles / polypropylene system extremely poor , it is difficult to obtain engineering application in practice
The use of high dielectric polymers blended with polypropylene to improve the dielectric properties of the material can overcome the shortcomings of inorganic nanoparticle fillers, but ordinary high dielectric polymers are compatible with non-polar polypropylene due to their high polarity There are also certain problems in the compatibility, for example, the blending effect of polypropylene and polyvinylidene fluoride is very poor, and uniform mixing cannot be achieved, and a large amount of compatibilizer needs to be added to improve its compatibility.

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  • A kind of composite material and its preparation method and application
  • A kind of composite material and its preparation method and application

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preparation example Construction

[0026] On the other hand, the embodiment of the present invention provides the preparation method of the above-mentioned composite material, and the preparation method includes the following steps: the polyvinylidene fluoride-hexafluoropropylene and polypropylene are prepared by melt blending to obtain the composite material.

[0027] In the examples of the present application, the melt blending temperature is 190-280°C.

[0028] In the embodiment of the present application, the melt blending time is 10-60 min.

[0029] On the other hand, the embodiments of the present invention provide the application of the above-mentioned composite material in power transmission and power storage.

[0030] In the embodiment of the present application, the composite material is applied to a high dielectric film or an insulating pipe.

[0031] In the embodiment of the present application, the thickness of the high dielectric film is 5-30 μm; optionally, the dielectric constant of the high di...

Embodiment 1

[0036] 1) Stir 2.4 grams of polyvinylidene fluoride-hexafluoropropylene (30vol.%) and 2.6 grams of polypropylene (70vol.%) evenly, add them to the container, blend at 190°C and 70rpm for 30 minutes, and extrude It is granulated to make polyvinylidene fluoride-hexafluoropropylene / polypropylene composite material.

[0037] 2) Place a certain amount of polyvinylidene fluoride-hexafluoropropylene / polypropylene pellets on a polyimide film with a fixed thickness (20 microns) template, and then cover with a layer of polyimide film, Then sandwich it between two steel plates with smooth surfaces, preheat at 190°C for 10 minutes, and then hot press at 10MPa for 10 minutes. The ethylene-hexafluoropropylene / polypropylene film was removed.

[0038] The polyvinylidene fluoride-hexafluoropropylene / polypropylene capacitor film prepared by the formula and process of the present invention has a filler such as figure 1 As shown, the compatibility and dispersion are good, which ensures the unif...

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Abstract

A composite material and its preparation method and application, the composite material is composed of polyvinylidene fluoride-hexafluoropropylene and polypropylene. The present invention adopts polyvinylidene fluoride-hexafluoropropylene as a raw material, and prepares polyvinylidene fluoride-hexafluoropropylene / polypropylene composite material through a method of melt blending. In the composite material, polyvinylidene fluoride-hexafluoropropylene and polypropylene matrix Compatibility and dispersion are good, and the 5-30 micron film made by further hot pressing or co-extrusion has the advantages of high dielectric constant and good processing performance, and has broad application prospects in the fields of film capacitors and the like.

Description

technical field [0001] This paper relates to the technology of organic thin film dielectric capacitors, especially a kind of composite material and its preparation method and application. Background technique [0002] Polypropylene material is widely used in many fields, among which it occupies an important position in the dielectric material for capacitors, because polypropylene film has low dielectric loss and high breakdown strength. Film capacitors made of biaxially oriented polypropylene are important electrical and electronic components and are widely used in many fields. They can play the role of filtering, smoothing and rectification, and can also be used as DC supports, but their low dielectric constant ( ~2.2) It limits its capacitance per unit volume and energy storage characteristics. The excessive volume of film capacitors has become an obstacle to the further development of electronic and electrical systems. Therefore, it is imperative to promote the miniaturiz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L27/16C08L27/20H01G4/18H01G4/33
CPCC08L23/12C08L27/16C08L27/20H01G4/18H01G4/33
Inventor 党智敏郑明胜张翀邢照亮戴熙瀛张翔宇
Owner TSINGHUA UNIV