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Polypropylene composite dielectric with high energy storage density interlayer and preparation method thereof

A high energy storage density, dielectric technology, applied in chemical instruments and methods, layered products, flat products, etc., can solve the problems of reduced breakdown field strength and unsatisfactory improvement of energy storage performance, and achieve high energy storage performance Effect

Active Publication Date: 2022-04-15
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The study found that doping high dielectric constant inorganic nanoparticles, such as BaTiO 3 , SrTiO 3 , CCTO and other high-dielectric inorganic nanoparticles can significantly increase the dielectric constant of polymers, but at the same time the breakdown field strength tends to decrease, so the effect of improving energy storage performance is not ideal

Method used

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  • Polypropylene composite dielectric with high energy storage density interlayer and preparation method thereof
  • Polypropylene composite dielectric with high energy storage density interlayer and preparation method thereof
  • Polypropylene composite dielectric with high energy storage density interlayer and preparation method thereof

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preparation example Construction

[0047] The preparation method of interlayer polypropylene composite dielectric with high energy storage density comprises the following steps:

[0048] Step 1, using two-step method to melt blend polypropylene (PP) base material and nanometer BaTiO 3 Granules, 10wt%, 20wt%, 30wt%, 40wt%, 45wt%, 50wt%, 55wt% and 60wt% PP / BaTiO 3 Nanocomposite dielectric samples were then hot-pressed PP / BaTiO with a flat vulcanizer using a step-by-step pressure boost method 3 Nanocomposite dielectrics, the vulcanization process of the flat vulcanizer is: first preheat for 20 minutes without pressure, then press for 5 minutes under 5MPa pressure, then press for 5 minutes under 10MPa pressure, and finally press for 5 minutes under 15MPa. After the end, keep the pressure and water cool to Take out the mold at about 35°C to get PP / BaTiO with a certain thickness 3 Single layer composite dielectric thin film specimen.

[0049] Step 2, adopt two-step method melt-blending polypropylene (PP) base mate...

Embodiment 1

[0064] refer to figure 1 , the preparation method of ABA type sandwich structure polypropylene nanocomposite dielectric (wherein A layer is 25 μm thick, the PP / MgO nanocomposite dielectric of doping content 0.5wt%; B layer is 50 μm thick, the PP / BaTiO of doping content 10wt% 3 single-layer composite dielectric), the specific steps are as follows:

[0065] Step 1, 50μm thick PP / BaTiO 3 Preparation of Nanocomposite Dielectric Films

[0066] Step 1.1. Preheat the mixer at 180°C. After reaching the set temperature, set the rotation speed to 5r / min. Put in 16g of PP base material, then increase the rotation speed to 50r / min, melt for 3min, and then reduce the rotation speed to 5r / min, then slowly add 24g of BaTiO 3 Nanoparticles, after being completely poured in, increase the speed to 50r / min, and blend for 20min; take out the blended sample to obtain PP / BaTiO with a concentration of 60wt%. 3 Nanocomposite dielectric masterbatch.

[0067] Step 1.2. Preheat the mixer at 180°C, ...

Embodiment 2

[0076] The preparation method of ABA type sandwich structure polypropylene nanocomposite dielectric (wherein A layer is 25 μm thick, the PP / MgO nanocomposite dielectric of doping content 0.5wt%; B layer is 50 μm thick, the PP / BaTiO of doping content 20wt% 3 single-layer composite dielectric), the specific steps are as follows:

[0077] Step 1, 50μm thick PP / BaTiO 3 Preparation of Nanocomposite Dielectric Films

[0078] Step 1.1, using melt blending to prepare PP / BaTiO with a concentration of 60wt% 3 Nanocomposite dielectric masterbatch, the specific implementation steps are the same as in Example 1.

[0079] Step 1.2. Preheat the mixer at 180°C. After it reaches the set temperature, adjust the speed to 5r / min. Put 20g of pure PP and 10g of 60wt% PP / BaTiO obtained in the previous step 3 For the nanocomposite dielectric masterbatch, increase the rotation speed to 50r / min, and blend for 20min. Take out the sample to obtain the concentration of 20wt% PP / BaTiO 3 Nanocomposite ...

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Abstract

The invention discloses an interlayer polypropylene composite dielectric with high energy storage density and a preparation method thereof, and the method for preparing the interlayer polypropylene composite dielectric with high energy storage density comprises the following steps: (1) adding a polypropylene base material into a high-temperature torque rheometer for melting, respectively adding BaTiO3 and MgO nanoparticles, and uniformly stirring; stirring and blending at a high temperature for a certain time to prepare a PP / BaTiO3 and PP / MgO nano composite dielectric with a certain concentration; (2) exhausting and hot-pressing by using a press vulcanizer by adopting a step-by-step boosting method to obtain a PP / BaTiO3 and PP / MgO nano composite dielectric film with a certain thickness; and (3) stacking the prepared single-layer PP / BaTiO3 or PP / MgO films according to the sequence of ABA or BAB, and pressing for 5 minutes by using a press vulcanizer at 10MPa to obtain the sandwich-structure polypropylene nano-composite dielectric film. The breakdown performance and the energy storage performance are tested to find that the energy storage performance of the sandwich structure polypropylene nano composite dielectric is effectively improved due to the gain of breakdown field strength brought by the layer A and the high dielectric constant brought by the layer B.

Description

technical field [0001] The invention belongs to the technical field of polymer nanocomposite dielectrics, in particular to interlayer polypropylene composite dielectrics with high energy storage density and a preparation method thereof. Background technique [0002] Polymer dielectric capacitors have the advantages of megawatt-level power density, microsecond-level charge-discharge rate, million-cycle life, easy processing, and environmental protection, and are widely used in pulse power devices and power systems. The rapid development of compact pulsed power devices, wind turbines, electric vehicles, and aerospace power systems urgently requires the development of high-temperature, high-energy-density dielectric capacitors. Polymer-based nanocomposite dielectrics combine the excellent dielectric and thermal properties of inorganic fillers with the high breakdown strength and ease of processing of polymer matrix, which is an effective way to improve the breakdown and energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29D7/01B29C43/00B29C43/14B29C43/20B32B9/00B32B9/04B32B27/32B32B27/06B29K23/00B29K505/00
Inventor 闵道敏蔡姝娆糜芮武庆周王威望李盛涛
Owner XI AN JIAOTONG UNIV
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