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A preparation method of polypropylene/nanocomposite dielectric with high DC breakdown field strength

A nano-composite, breakdown field strength technology, applied in the direction of fixed capacitor dielectric, flat products, fixed capacitor components, etc., can solve the problem of affecting the safe and stable operation of UHV power transmission system, DC filter single capacitor failure, unbalance Alarm and other problems, to achieve the effect of improving the medium safety margin, improving the DC breakdown strength, and reducing the operation failure rate

Active Publication Date: 2019-09-10
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The DC filter of the converter station frequently has a single capacitor failure, resulting in multiple unbalance alarms, and the system is forced to shut down, seriously affecting the safe and stable operation of the UHV transmission system

Method used

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  • A preparation method of polypropylene/nanocomposite dielectric with high DC breakdown field strength
  • A preparation method of polypropylene/nanocomposite dielectric with high DC breakdown field strength
  • A preparation method of polypropylene/nanocomposite dielectric with high DC breakdown field strength

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A preparation method of a polypropylene / nano composite dielectric with high DC breakdown field strength, the specific steps are as follows:

[0039] (1) Preparation of pure polypropylene dielectric

[0040] a) The HC-312 polypropylene base material particles produced by Borealis were kept at 50° C. for 2 hours to remove moisture. 30 g of dried polypropylene particles were weighed.

[0041] b) Keep the dried polypropylene base material in a HAAKE PolyLab QC torque rheometer at 170-180° C. for 5 minutes, and adjust the temperature to 170° C. after the base material particles are completely melted. The rotational speed of the torque rheometer is divided into three gears, each of which is 50 rpm, 100 rpm and 150 rpm, and each is continuously stirred for 30 min.

[0042] c) After stirring, adjust the torque rheometer to 150°C. Turn on the stirring chamber of the torque rheometer to obtain a pure polypropylene medium, which is placed at room temperature to cool.

[0043] ...

Embodiment 2

[0070] A preparation method of polypropylene / nano composite dielectric with high DC breakdown field strength, comprising the following steps:

[0071] 1) Select a silane coupling agent to modify the surface of the nanoparticles; the nanoparticles are MgO;

[0072] 2) Add the polypropylene base material into the torque rheometer cavity, heat up the particles until the particles are melted, add the nanoparticles modified with the silane coupling agent, and keep stirring at 170 °C to obtain polypropylene / nano-MgO with uniformly dispersed nanoparticles. Composite dielectric; nanoparticles account for 0.5% of the mass of polypropylene particles;

[0073] 3) The sandwich structure is used to hot press polypropylene / nano composite dielectric with a flat vulcanizer. The vulcanization process of the flat vulcanizer is: preheating for 300s, exhausting 15 times, prepressing for 10s, and curing time for 250s; MgO composite dielectric films. (Other specific steps are the same as in Examp...

Embodiment 3

[0075] A preparation method of polypropylene / nano composite dielectric with high DC breakdown field strength, comprising the following steps:

[0076] 1) Select a silane coupling agent to modify the surface of the nanoparticles; the nanoparticles are SiO 2 ;

[0077] 2) Add the polypropylene base material into the torque rheometer cavity, heat up until the particles are melted, add the nanoparticles modified by the silane coupling agent, and keep stirring at 175°C to obtain polypropylene / nano-SiO with uniform dispersion of nanoparticles. 2 Composite dielectric; nanoparticles account for 5% of the mass of polypropylene particles;

[0078] 3) The sandwich structure is used to hot press polypropylene / nano composite dielectric with a flat vulcanizer. The vulcanization process of the flat vulcanizer is: preheating for 400s, exhausting 13 times, prepressing 8s, and curing time 260s; SiO 2 Composite dielectric films. (Other specific steps are the same as in Example 1)

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Abstract

The invention discloses a method for preparing a polypropylene / nano composite dielectric with high direct current breakdown field strength, and the method is as follows: (1) silane coupling agent KH570 is selected for surface modification of AlN nanoparticles and alpha-phase Al2O3 nanoparticles to enhance the bridging effect of inorganic nanoparticles and a polymer matrix; (2) a polypropylene base material is added in a high temperature torque rheometer cavity, when the particles are melted, silane coupling agent modified AlN and Al2O3 nanoparticles are respectively added, and after high-speed stirring for a certain time at high temperature, the nano composite dielectric with uniformly dispersed nanoparticles can be prepared; and (3) polypropylene / AlN and polypropylene / Al2O3 thin film samples with the thickness of 150 mu m can be prepared by use of a press vulcanizer by hot pressing by a sandwich structure. The direct current breakdown field strength can be tested by a continuous voltage increasing mode, and test results show that: the direct current breakdown field strength of the polypropylene / AlN nano composite dielectric and the direct current breakdown field strength of the polypropylene / Al2O3 nano composite dielectric are respectively increased by 13% and 35% compared with that of a pure polypropylene medium.

Description

technical field [0001] The invention belongs to the field of preparation of nanocomposite dielectrics, and in particular relates to a preparation method of polypropylene / nanocomposite dielectrics with high DC breakdown field strength. Background technique [0002] Among the ultra-high voltage power equipment, the working field strength of the power capacitor medium is the highest. For example, the designed working field strength of the ultra-high voltage DC filter capacitor is above 100kV / mm, while the designed working field strength of the DC pulse capacitor is above 300kV / mm. , the probability of dielectric breakdown under strong electric field increases, which may easily lead to failure of power equipment. The unrecoverable breakdown of solid insulating medium can easily lead to catastrophic failure of power equipment. The development of nanotechnology provides new ideas and solutions for the development of nanocomposite dielectrics suitable for high voltage levels and c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08K3/28C08K3/22C08K9/06C08K3/36H01G4/18B29C43/20B29C35/02B29C43/58B29L7/00
Inventor 谢东日闵道敏李盛涛湛海涯闵超
Owner XI AN JIAOTONG UNIV
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