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Composite test material for testing whether water enters a cable, its preparation method and application

A technology for testing cables and water ingress, which is applied in the direction of analyzing materials through chemical reactions and observing the effects of chemical indicators on materials, etc., which can solve problems such as insufficient reliability, increased costs, and troublesome processes, and achieve Excellent water absorption, easy maintenance, strong identification effect

Active Publication Date: 2022-02-08
中电保力(北京)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Indicators are greatly affected by ambient heat, low resolution
More importantly, simply put the color-changing test paper or the color-changing reagent into the cable, and the color will change in a low humidity environment. At this time, the reagent has not reached the excessive value of the moisture content inside the cable. At this time, the cable is tested on the spot. Or replace, will result in a great increase in cost
Therefore, simply placing the water-absorbing and discoloring material directly into the cable is cumbersome in process, and it is not reliable enough to judge whether the water content of the cable exceeds the standard. Based on this, it is urgent to develop a material that can effectively test whether the cable has entered water, and has excellent comprehensive performance. , mechanical strength up to standard, easy to manufacture, fast-response material

Method used

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  • Composite test material for testing whether water enters a cable, its preparation method and application
  • Composite test material for testing whether water enters a cable, its preparation method and application
  • Composite test material for testing whether water enters a cable, its preparation method and application

Examples

Experimental program
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Effect test

preparation example 1

[0042] (1) The aqueous solution of monomeric acrylic acid and acrylamide is fed in a certain molar ratio, heated to reflux at 90°C under an inert atmosphere, and 0.3wt% of the total monomer mass is added as an initiator potassium persulfate-sodium bicarbonate (1:1, w / w) Initiate the polymerization reaction for 0.5-1h;

[0043] (2) Add 3,3'-diallyl diphenol (the molar ratio of acrylic acid, acrylamide, 3,3'-diallyl diphenol is 5:1:0.1), continue at 80 React at -90°C for 6 hours, dehydrate, cool, wash, and dry to obtain a water-absorbent resin, hereinafter referred to as water-absorbent resin 1. The weight-average molecular weight of the water-absorbent resin obtained through GPC test was 957200 g / mol, and PDI=1.92.

preparation example 2

[0045] Other conditions and steps are the same as in Preparation Example 1, except that the molar ratio of acrylic acid, acrylamide, and 3,3'-diallyl biphenol is 5:1:0.2. The weight-average molecular weight of the water-absorbing resin obtained through GPC test was 1268400 g / mol, and PDI=2.13. Hereinafter, it is referred to as water-absorbent resin 2 .

preparation example 3

[0047] Other conditions and steps are the same as in Preparation Example 1, except that the molar ratio of acrylic acid, acrylamide, and 3,3'-diallyl biphenol is 5:1:0.3. The weight-average molecular weight of the water-absorbent resin obtained through GPC test was 1457100 g / mol, and PDI=2.28. Hereinafter, it is referred to as water-absorbent resin 3 .

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Abstract

The invention provides a composite test material for testing whether a cable has entered water, which comprises the following raw materials: water-absorbing resin, polyurethane acrylic resin, inorganic color developer, plasticizer, filler and flame retardant. Wherein the water-absorbing resin is a copolymer of acrylic acid, acrylamide and 3,3'-diallyl biphenol as monomers; the inorganic developer is anhydrous copper sulfate or anhydrous cobalt chloride; the filler Hydrophobically modified calcium carbonate. These components play a synergistic effect, which makes the composite material change color under the humidity of 35-45%, and at the same time, the mechanical properties meet the standards. The composite material provided by the invention can be conveniently made into a linear or cloth-shaped material. When using it, it is only necessary to put the composite test material into the cable, open the cable joint when necessary, and observe whether the composite material changes color to judge the progress inside the cable. Water conditions, convenient, fast, stable and reliable.

Description

technical field [0001] The invention belongs to the field of electrical equipment and polymer composite materials, and in particular relates to a composite test material for testing whether a cable has entered water, a preparation method and an application thereof. Background technique [0002] Our country is a big power country, and the cable is made of one or more mutually insulated conductors covered with an insulating layer and a protective layer, and is used to transmit electricity or information from one place to another. Usually overhead cables or underground cables. Cables have very high requirements for waterproof and moisture-proof. Once the cable is flooded and damp, it will gradually form water branch discharge under the action of high-voltage electromagnetic field, destroying the main insulation, until the breakdown discharge. Therefore, the quality assurance of cable construction and laying is very important for the reliable operation of cables in the future; ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/02C08L75/14C08K13/06C08K9/06C08K3/26C08K3/30C08K3/16C08K5/523C08K3/22C08K5/12G01N21/78
CPCC08L33/02G01N21/78C08L2203/20C08L2201/02C08K2003/2227C08K2003/2224C08K2003/3045C08L75/14C08K13/06C08K9/06C08K3/26C08K3/30C08K5/523C08K3/22C08K5/12C08K3/16
Inventor 王宏伟袁振王少华王宇川张海凤
Owner 中电保力(北京)科技有限公司
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