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Preparation method for cable insulating material capable of realizing self-repairing of early-stage electrical-tree defects

A cable insulation and self-repair technology, which is applied in the production of bulk chemicals, etc., can solve the problems of high resource consumption, not widely used, and poor effect, and achieve high repair efficiency, increased repair ability, and simple preparation process.

Inactive Publication Date: 2017-05-10
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These traditional methods require a lot of manual intervention, consume a lot of resources, have poor results, and cannot repair insulation defects caused by electrical branches
The technology of adding other materials to the cable insulation to suppress the development of electric tree branches has not been widely used because it cannot fundamentally repair the defects of electric tree branches.

Method used

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  • Preparation method for cable insulating material capable of realizing self-repairing of early-stage electrical-tree defects
  • Preparation method for cable insulating material capable of realizing self-repairing of early-stage electrical-tree defects
  • Preparation method for cable insulating material capable of realizing self-repairing of early-stage electrical-tree defects

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 Shown is the preparation process of cable insulation materials for self-repairing early electric tree defects, specifically:

[0028] 1) Weigh 5 g of urea, mix 10 g of formaldehyde solution with a mass fraction of 37% in a container, and mechanically stir at a speed of 400 r / min until the urea is completely dissolved, adjust the pH to 8 with triethanolamine, and store at 70° C. After reacting for 1 hour, 40 g of distilled water was added to form a stable and transparent urea-formaldehyde prepolymer for use.

[0029] 2) Weigh 1 g of emulsifier sodium dodecylbenzene sulfonate and mix it with 10 g of molten dicyclopentadiene, stir it mechanically for 20 minutes at 50°C to fully emulsify it, and add 40 g of it dropwise During the emulsification process, an appropriate amount of defoamer n-octanol was added dropwise to eliminate the foam to obtain a core material emulsion.

[0030] 3) Add the solution obtained in step 1) dropwise to the solution obtained i...

Embodiment 2

[0033] 1) Weigh 5 g of urea, mix 10 g of formaldehyde solution with a mass fraction of 37% in a container, and mechanically stir at a speed of 400 r / min until the urea is completely dissolved, adjust the pH to 9 with triethanolamine, and store at 70° C. After reacting for 1 hour, 45 g of distilled water was added to form a stable and transparent urea-formaldehyde prepolymer for use.

[0034] 2) Weigh 1 g of emulsifier sodium dodecylbenzene sulfonate and mix it with 10 g of molten dicyclopentadiene, stir mechanically for 20 minutes at 50°C to fully emulsify, and add 34 g of emulsifier dropwise During the emulsification process, an appropriate amount of defoamer n-octanol was added dropwise to eliminate the foam to obtain a core material emulsion.

[0035] 3) Add the solution obtained in step 1) dropwise to the solution obtained in step 2) with mechanical stirring at a speed of 450r / min, and adjust the pH to about 3.5 with hydrochloric acid. After the microcapsules are formed, s...

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Abstract

The invention relates to a preparation method for a cable insulating material capable of realizing self-repairing of early-stage electrical-tree defects. The cable insulating material is composite material prepared by blending 1 to 3 wt% of a microcapsule containing a liquid repairing agent and a low-density polyethylene base material, then adding 0.02 to 0.05 wt% of a Grubbs catalyst, carrying out extrusion with an extruder and then carrying out cooling and drying, wherein the microcapsule containing the liquid repairing agent is a urea-formaldehyde resin-coated dicyclopentadiene nanometer microcapsule. Early-stage electrical-tree defects are repaired through a chemical reaction of the repairing agent with the catalyst imbedded in a substrate, so the dielectric strength of the cable insulating material is prevented from obvious decrease. The material prepared in the invention has the characteristics of simple preparation, high repairing efficiency, capacity of maintaining dielectric strength for a long time, etc., is extensively applicable to electric insulation layers of cables and has effectively improved service life and usage stability.

Description

technical field [0001] The invention belongs to the technical field of electrical equipment, and relates to a preparation method of a cable insulating material for self-repairing of early electric tree branch defects. Background technique [0002] Polyethylene cables are increasingly used in power transmission projects. Under the synergistic effect of various factors during use, defects such as electrical branches will inevitably occur inside them. The further development of these micro-defects will lead to aging and damage of material insulation, causing Cable insulation failures and equipment failures reduce power supply reliability. Therefore, if the polymer material can be made to have the function of self-healing, the above-mentioned problems can be solved in the early stage of the development of the electric tree, the service life of the cable insulation material can be significantly extended, and the reliability and safety of the product can be improved. [0003] In ...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08K9/10C08K5/01C08G12/12
CPCC08G12/12C08K5/01C08K9/10C08L23/06Y02P20/52
Inventor 王有元陈伟根廖瑞金张占喜李剑杜林杨丽君周湶王灿肖坤
Owner CHONGQING UNIV
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