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High-energy storage density polypropylene-maleic anhydride grafted polypropylene-nano-zirconia composite material and preparation method thereof

A technology of grafting polypropylene and nano-zirconia is applied in the field of power capacitors to achieve the effect of increasing the breakdown field strength and increasing the dielectric constant

Active Publication Date: 2018-05-04
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The current research is mostly limited to low dielectric constant nanoparticles (nano-silicon dioxide, nano-alumina, etc., with a dielectric constant less than 10) to improve the breakdown field strength of polypropylene-based composites or high dielectric constant nanoparticles ( Nano-barium titanate, nano-titanium oxide, etc., the dielectric constant is greater than 100 or even greater) to improve the dielectric of the polypropylene matrix and improve its energy storage characteristics, the effect has certain limitations
However, there is almost no research on nano-zirconium dioxide and polypropylene composites with a dielectric constant between the two types of nanoparticles (between high and low dielectric constants).

Method used

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  • High-energy storage density polypropylene-maleic anhydride grafted polypropylene-nano-zirconia composite material and preparation method thereof
  • High-energy storage density polypropylene-maleic anhydride grafted polypropylene-nano-zirconia composite material and preparation method thereof
  • High-energy storage density polypropylene-maleic anhydride grafted polypropylene-nano-zirconia composite material and preparation method thereof

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Embodiment 1

[0028] Example 1: Preparation of high energy storage density polypropylene-maleic anhydride grafted polypropylene-nano zirconia composite material

[0029] The first step (masterbatch preparation):

[0030] Add maleic anhydride-grafted polypropylene and nano-zirconia into the torque rheometer, and antioxidant 1010 with a mass fraction of 0.3%, and melt blend at 180° C. for 10 minutes to obtain a masterbatch.

[0031] The second step (composite material preparation):

[0032] Add polypropylene, maleic anhydride grafted polypropylene and masterbatch into the torque rheometer, and after the torque is stable, add 0.12g of antioxidant 1010 (accounting for 0.3% of the total mass). Under the conditions of 40r / min and 180°C, melt compounding was carried out for 20 minutes.

[0033] In the mixture, the total mass of polypropylene and maleic anhydride-grafted polypropylene is 40g, and the mass proportions of maleic anhydride-grafted polypropylene are 0, 10%, 30%, 50%, and 70%, respect...

Embodiment 2

[0034] Example 2: Preparation of a high energy storage density polypropylene-maleic anhydride grafted polypropylene-nano zirconia composite film

[0035] 1) Cut a circular hole with a diameter of 50 mm on a polyimide film with a thickness of about 120 μm as a mold.

[0036] 2) Put 0.26g of composite material into each round hole of the mold, use a flat vulcanizer, preheat for a period of time at 190°C, exhaust, and then hot press at 20MPa to obtain polypropylene-maleic anhydride Grafted polypropylene-nano zirconia composite film.

[0037] Among them, the preheating time at 190°C can be set to 280-320s, for example, it can be set to 300s, and the number of exhausts can be set to 10-15 times, each time 9-11s, for example, it is set to exhaust 10 times, every time The time is 10s; under 20MPa, the hot pressing time can be set to 280-320s, for example, it can be set to 300s, the diameter of the film sample is 50mm, and the thickness is about 130μm.

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Abstract

The invention provides a high-energy storage density polypropylene-maleic anhydride grafted polypropylene-nano-zirconia composite material and a preparation method thereof. The preparation method comprises the step: performing melt blending on pure polypropylene, maleic anhydride grafted polypropylene and nano zirconia in a certain ratio, wherein the polypropylene is isotatic polypropylene; the grafting rate of the maleic anhydride grafted polypropylene is 1%; the diameter of the nano-zirconia is 10-30 nm; the surface of the nano-zirconia is subjected to KH570 silane coupling. In addition, a composite material film is prepared from the composite material. The dielectric constant and the breakdown field strength of a ternary system composite medium are remarkably improved, and with a weightratio of polypropylene to maleic anhydride medium polypropylene to nano-zirconia, the energy storage density is maximally increased, and in addition, dielectric loss and a pure polypropylene phase ratio are kept unchanged. By adopting the technique, a technical base is provided for increase of energy storage density of a film capacitor.

Description

technical field [0001] The invention belongs to the field of power capacitors, in particular to a high energy storage density polypropylene-maleic anhydride grafted polypropylene-nanometer zirconia composite material. Background technique [0002] Polypropylene is the most widely used dielectric material in power capacitors. It has the advantages of high breakdown field strength, low dielectric loss, and wide source, but its low dielectric constant limits the energy storage of polypropylene and its Further wider application. [0003] There are many studies on doping polypropylene with inorganic nanoparticles to form nanocomposites to improve the energy storage properties of polymers: for example, Lisa A.Fredin et al. ("Adv.Mater." 2012) studied nano-zirconia coated alumina , forming core-shell structure nanoparticles and then doping and modifying polypropylene, and did not use maleic anhydride-mediated polypropylene as a compatibilizer to construct a ternary system. A.M.Ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L51/06C08K9/06C08K3/22C08K5/134C08J3/22C08J5/18
CPCC08J3/226C08J5/18C08J2323/12C08J2351/06C08J2451/06C08K3/22C08K5/1345C08K9/06C08K2003/2244C08K2201/003C08K2201/011C08L23/12C08L51/06C08L2203/16
Inventor 刘文凤程璐刘晓伟刘成明李盛涛迟晓红
Owner XI AN JIAOTONG UNIV
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