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Preparation method of meta-aramid insulating paper for suppressing space charge accumulation

A space charge and insulating paper technology, applied in the direction of insulators, organic insulators, plastic/resin/wax insulators, etc., can solve problems affecting insulation performance, achieve the effects of increasing recombination probability, inhibiting space charge accumulation, and reducing motion speed

Active Publication Date: 2019-04-02
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0004] Meta-aramid insulating paper is a common insulating material for oil-immersed transformers, but the meta-aramid insulating paper under the action of a strong field will also affect its insulation performance due to the effect of space charge accumulation. Therefore, it is necessary to design a A preparation method of meta-aramid insulating paper capable of suppressing space charge accumulation

Method used

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  • Preparation method of meta-aramid insulating paper for suppressing space charge accumulation

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preparation example Construction

[0020] The preparation method of the meta-aramid insulating paper that suppresses the accumulation of space charges in this embodiment comprises the following steps:

[0021] a. After mixing meta-aramid chopped fiber and meta-aramid fiber pulp, disperse, disperse, and beat to prepare pulp mixed solution;

[0022] B, the pulp mixed solution that makes in the step a and nanometer TiO 2 After the deionized aqueous solution is mixed and decomposed, the nano-TiO is prepared by beating 2 Modified meta-aramid pulp;

[0023] C, the nano-TiO that makes in the step b 2 Modified meta-aramid pulp is paper-formed to produce meta-aramid insulating paper that inhibits space charge accumulation;

[0024] Nano TiO 2 Modification of meta-aramid insulating paper can make the meta-aramid insulating paper which has excellent performance suppress the accumulation of space charge, making it suitable for strong electric field environment. Nano-TiO 2 The reason why it can be used for the modific...

Embodiment 1

[0038] 1. Nano-TiO 2 Preparation of deionized aqueous solution: take nano TiO at a weight ratio of 1:400 2 Particles (with a particle size of 35nm) were mixed with deionized water to prepare a suspension, and then the suspension was placed at a temperature of 50°C and ultrasonically treated for 15 minutes to obtain dispersed nano-TiO 2 Deionized aqueous solution;

[0039] 2. Preparation of pulp mixed solution:

[0040] (1) Mixing and dispersion treatment: After mixing meta-aramid chopped fibers and meta-aramid fiber pulp at a weight ratio of 1:0.15, ultrasonic dispersion is carried out in deionized water using an ultrasonic dispersing processor model FS-1800N Processing, in the process of ultrasonic treatment, the frequency set by the processor is 20kHZ, the power is 1200W, the temperature during ultrasonication is 50°C, and the dispersion time is 10min;

[0041] (2) Deflagging treatment: after the dispersing treatment, use a fiber dissociator of model IMT-SJ0104 to perform...

Embodiment 2

[0050] 1. Nano-TiO 2 Preparation of deionized aqueous solution: take nano TiO at a weight ratio of 1:400 2 Particles (with a particle size of 32nm) were mixed with deionized water to prepare a suspension, and then the suspension was placed at a temperature of 60°C and ultrasonically treated for 10 minutes to obtain dispersed nano-TiO 2 Deionized aqueous solution;

[0051] 2. Preparation of pulp mixed solution:

[0052] (1) Mixing and dispersion treatment: After mixing meta-aramid chopped fibers and meta-aramid fiber pulp at a weight ratio of 1:0.20, ultrasonic dispersion is carried out in deionized water using an ultrasonic dispersing processor model FS-1800N Processing, in the process of ultrasonic treatment, the frequency set by the processor is 20kHZ, the power is 1200W, the temperature during ultrasonication is 60°C, and the dispersion time is 15min;

[0053] (2) Deflagging treatment: after the dispersing treatment, the fiber disintegrator model IMT-SJ0104 is used for d...

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Abstract

The invention provides a method for preparing meta-aramid-fiber insulating paper capable of inhibiting space charge accumulation. Through modifying meta-aramid-fiber insulating paper by using nano TiO2, the meta-aramid-fiber insulating paper, which has excellent performance, can inhibit space charge accumulation, has excellent insulating property and mechanical properties and is applicable to high-electric-field environments. The method provided by the invention comprises the following steps: a. mixing meta-aramid-fiber chopped fibers and meta-aramid-fiber pulp, and carrying out dispersing, relieving and pulping, so as to prepare a paper pulp mixed solution; b. mixing the paper pulp mixed solution prepared in the step (a) with nano TiO2 and a deionized water solution, carrying out relieving, then, carrying out pulping, so as to prepare nano TiO2 modified meta-aramid-fiber paper pulp; carrying out papermaking forming on the nano TiO2 modified meta-aramid-fiber paper pulp prepared in the step (b), thereby preparing the meta-aramid-fiber insulating paper capable of inhibiting space charge accumulation.

Description

technical field [0001] The invention relates to the interdisciplinary technical field of papermaking industry and material industry, in particular to a preparation method of meta-aramid insulating paper that suppresses space charge accumulation. Background technique [0002] Large oil-immersed power transformers are widely used in power transmission and distribution, and are one of the most important power equipment in power systems. The main insulation form inside a large oil-immersed power transformer is an oil-paper insulation structure, which will gradually age during the operation of the transformer. Since the aging process of transformer oil-paper insulation is irreversible, and the insulating paper is wound on the winding, it is difficult to solve the aging problem by replacing the insulating paper. Therefore, the aging state of the insulating paper largely determines the service life of the transformer. [0003] Studies have shown that when an insulating material is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H27/12D21H17/63D21H11/16
CPCD21H11/16D21H17/63D21H27/00
Inventor 李小平王谦唐超李永福彭华东李旭杨雍华廖玉祥王小波殷飞
Owner STATE GRID CORP OF CHINA
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