Method for preparing polypropylene / nano composite dielectric with high direct current breakdown field strength

A nano-composite, breakdown field strength technology, applied in fixed capacitor dielectrics, flat products, fixed capacitor components, etc., can solve problems affecting the safe and stable operation of UHV transmission systems, DC filter single capacitor failure, unbalanced Alarms and other problems, to achieve the effect of improving the safety margin of the medium, increasing the DC breakdown strength, and reducing the operating failure rate

Active Publication Date: 2017-09-15
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

Method used

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  • Method for preparing polypropylene / nano composite dielectric with high direct current breakdown field strength
  • Method for preparing polypropylene / nano composite dielectric with high direct current breakdown field strength
  • Method for preparing polypropylene / nano composite dielectric with high direct current breakdown field strength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A preparation method of 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) Insulate the HC-312 polypropylene base particles produced by Borealis at 50° C. for 2 hours to remove moisture. Weigh 30 g of dried polypropylene granules.

[0041] b) Heat 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 being 50 rpm, 100 rpm, and 150 rpm, and each is continuously stirred for 30 minutes.

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

[0043] (2) Surface mo...

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 cavity of the torque rheometer, heat up the particles and add the nanoparticles modified by the silane coupling agent after the particles are melted, and keep stirring at 170°C to prepare polypropylene / nano-MgO with uniformly dispersed nanoparticles. Composite dielectric; nanoparticles account for 0.5% of the mass of polypropylene particles;

[0073] 3) Use a flat vulcanizer to heat press polypropylene / nanocomposite dielectrics with a sandwich structure. The vulcanization process of the flat vulcanizer is: preheating for 300s, exhausting for 15 times, precompressing for 10s, and vulcanization time for 250s; MgO composite dielectric film. (other concrete steps are with...

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 cavity of the torque rheometer, heat up the particles and add the nanoparticles modified by the silane coupling agent after the particles are melted, and keep stirring at 175°C to obtain polypropylene / nano-SiO with uniformly dispersed nanoparticles 2 Composite dielectric; nanoparticles account for 5% of the mass of polypropylene particles;

[0078] 3) Use a flat vulcanizer to heat press polypropylene / nanocomposite dielectrics with a sandwich structure. The vulcanization process of the flat vulcanizer is: preheating for 400s, exhausting 13 times, precompressing for 8s, and vulcanization time for 260s; SiO 2 Composite Dielectric Films. (other concrete steps are wit...

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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, in particular to a method for preparing polypropylene / nanocomposite dielectrics with high DC breakdown field strength. Background technique [0002] In ultra-high voltage and ultra-high voltage power equipment, the working field strength of the power capacitor medium is the highest. For example, the design working field strength of UHV DC filter capacitor is above 100kV / mm, while the design working field strength of DC pulse capacitor is above 300kV / mm , the probability of dielectric breakdown under strong electric field increases, which easily leads to failure of power equipment. The non-recoverable breakdown of solid insulating dielectric can easily lead to catastrophic failure of electrical equipment. The development of nanotechnology provides new ideas and solutions for the development of nanocomposite dielectrics suitable for high voltage levels and complex working co...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08K3/28C08K3/22C08K9/06C08K3/36H01G4/18B29C43/20B29C35/02B29C43/58B29L7/00
CPCH01G4/18C08K3/22C08K3/28C08K3/36C08K9/06B29C35/02B29C43/203B29C43/58C08K2003/222C08K2003/2227C08K2003/282B29C2043/5816B29L2007/00C08L23/12
Inventor 谢东日闵道敏李盛涛湛海涯闵超
Owner XI AN JIAOTONG UNIV
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