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Modified expandable graphite, coating film for cable fire prevention and explosion prevention and production method thereof

A technology of expanded graphite and coating film, which is applied in the direction of insulating cables, chemical instruments and methods, cables, etc., and can solve problems such as lack of adhesion of cables, poor fire resistance of fireproof materials, and easy aging

Active Publication Date: 2021-07-06
XUCHANG SIDA ELECTRIC POWER EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, fire-resistant cables are expensive and not universal; the long-lasting adhesion of fire-resistant coatings to cables is poor, and the construction is limited by the site, so it needs to be painted many times, and a dense covering layer cannot be formed. The hardness of the carbonized layer is poor, and it is easy to be burned through or Blowing down, cracks are easy to appear at the bend of the cable, poor fire resistance, easy aging, and there is a risk of organic solvent volatilization; the disadvantage of traditional non-self-adhesive flame-retardant tapes is the lack of lasting adhesion with the cable, and the fire-resistant performance of fire-resistant materials is poor. The service life is short and the timeliness is poor. After long-term operation, its flame retardant effect will be weakened, and repeated construction is required, which increases the cost and burden of cable operation and maintenance.

Method used

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  • Modified expandable graphite, coating film for cable fire prevention and explosion prevention and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A modification method of expandable graphite, specifically comprising the following steps:

[0033] 1) Set the temperature of the puffing furnace to 350°C, send the expandable graphite into the puffing furnace, and puff it in the puffing furnace for 6 seconds to obtain pre-expanded graphite worms;

[0034] Expandable graphite is prepared from natural flake graphite through oxidative intercalation reaction. It is a conventional chemical raw material and can be purchased and used by itself, or prepared and used by the method of the prior art.

[0035] The intercalants contained in expandable graphite, the driving force generated by vaporization under high temperature conditions can open the graphite sheets, so the expansion temperature is an important parameter affecting the structure of expanded graphite. From 300-900 ° C, the expansion of expanded graphite The volume will gradually increase with the increase of the expansion temperature. This shows that with the increas...

Embodiment 2

[0043]A modification method of expandable graphite, specifically comprising the following steps:

[0044] 1), set the temperature of the puffing furnace to 450°C, send the expandable graphite into the puffing furnace, and puff it in the puffing furnace for 3 seconds to obtain pre-expanded graphite worms;

[0045] 2), mixing pre-expanded graphite worms with water, and then adding a dispersant for ultrasonic dispersion to obtain a pre-expanded graphite worm dispersion;

[0046] The mass ratio of the pre-expanded graphite worms to water is 1:70, and the added amount of the dispersant is 2% of the weight of the pre-expanded graphite worms. The dispersant can be a conventional dispersant, such as active calcium phosphate and sodium polyacrylate.

[0047] 3), adding basic copper carbonate to the pre-expanded graphite worm dispersion, and continuing ultrasonic dispersion to obtain the target dispersion;

[0048] The addition amount of basic copper carbonate is 10% of pre-expanded g...

Embodiment 3

[0051] A modification method of expandable graphite, specifically comprising the following steps:

[0052] 1) Set the temperature of the puffing furnace to 400°C, send the expandable graphite into the puffing furnace, and puff it in the puffing furnace for 5 seconds to obtain pre-expanded graphite worms;

[0053] 2), mixing pre-expanded graphite worms with water, and then adding a dispersant for ultrasonic dispersion to obtain a pre-expanded graphite worm dispersion;

[0054] The mass ratio of the pre-expanded graphite worms to water is 1:60, and the added amount of the dispersant is 1% of the weight of the pre-expanded graphite worms. The dispersant can be a conventional dispersant, such as active calcium phosphate and sodium polyacrylate.

[0055] 3), adding basic copper carbonate to the pre-expanded graphite worm dispersion, and continuing ultrasonic dispersion to obtain the target dispersion;

[0056] The addition amount of basic copper carbonate is 60% of pre-expanded g...

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Abstract

The invention relates to modified expandable graphite, a graphite-based coating film for cable fire prevention and explosion prevention and a production method thereof, the expandable graphite is pre-expanded, and then the pre-expanded expandable graphite is modified by basic cupric carbonate. The coating film for cable fire prevention and explosion prevention is composed of a fiber layer and modified expanded graphite layers wrapping the two faces of the fiber layer, the modified expanded graphite layers are obtained by pressing the modified expandable graphite, and the modified expanded graphite layers and the fiber layer are bonded together through solid gum. The coating film has excellent fireproof performance, explosion-proof performance and anti-static and anti-electromagnetic interference effects, and graphite has good conductivity and can be effectively connected with a grounding grid, so that electrostatic current quickly flows into the ground through the grounding grid, and the anti-static and anti-electromagnetic interference effects are achieved.

Description

technical field [0001] The invention relates to the technical field of cable protection materials, in particular to a modified expandable graphite, a graphite-based coating film for cable fire and explosion protection and a production method thereof. Background technique [0002] Wires and cables are the carriers of power transmission. With the development of social power systems, on the one hand, a large number of traditional above-ground cables, pipes, and public facilities are built underground, resulting in the same crowded underground space as the ground; on the other hand, power cables are in operation. Once a short-circuit fault occurs, huge energy will be released instantly at the fault point, accompanied by the physical processes of electrostatic radiation, electromagnetic radiation, thermal radiation, and pressure radiation. These physical processes will inevitably cause various disasters such as electromagnetic interference, combustion, and explosion. Under the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/225H01B7/29
CPCC01B32/225H01B7/29
Inventor 张国锋吕金勇务孔永段绍辉吕坤阳李付磊李建鑫张明磊陈瑞斌陈四甫胡松江陈明喜陈晓朋陈见甫邢远郑伟周媛李景丽王森谭波吕亮丁卫东郭洁
Owner XUCHANG SIDA ELECTRIC POWER EQUIP
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