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Tracking-resistant ethylene propylene diene monomer sealing material and preparation method thereof

An EPDM rubber, anti-tracking technology, applied in mechanical equipment, engine components, piston rings, etc., can solve problems affecting the safe operation of converter valves, seal ring ablation, seal failure, etc., to improve durability The effect of tracking performance and mechanical properties, reducing ablation and improving thermal conductivity

Inactive Publication Date: 2019-04-02
EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the electrode seal ring is made of EPDM rubber material without a flame retardant system. As the current at the seal ring gradually increases, electric tracking is formed on the surface of the seal ring, which ablates the seal ring and causes a tight seal. Failure, affecting the safe operation of the entire converter valve

Method used

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  • Tracking-resistant ethylene propylene diene monomer sealing material and preparation method thereof

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Effect test

Embodiment 1

[0028] A tracking-resistant EPDM sealing material, the raw materials of which include by weight: 100 parts of EPDM rubber, 60 parts of carbon black, 60 parts of activated aluminum hydroxide, 20 parts of nano-alumina, multi-walled carbon 10 parts of nanotubes, 20 parts of paraffin oil, 5 parts of zinc oxide, 4 parts of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, 1 part of tripropenyl isocyanurate share. Among them, the Mooney viscosity of EPDM rubber (ML1+4, 125°C) is 25, the content of ethylene monomer is 53%, the content of the third monomer ethylidene norbornene is 6%; the carbon black is fast extrusion furnace black , the particle size is 40nm; the activated aluminum hydroxide is activated aluminum hydroxide surface modified by the silane coupling agent KH550, the mesh number is 2000 mesh, and the purity is above 99.6%; the diameter of the multi-walled carbon nanotube is 10nm, and the tube length is 30μm. The purity is more than 98%; the crystal form of nano-alumina is α...

Embodiment 2

[0036] A tracking-resistant EPDM sealing material, the raw materials of which include by weight: 100 parts of EPDM rubber, 40 parts of carbon black, 70 parts of activated aluminum hydroxide, 20 parts of nano-alumina, multi-walled carbon 30 parts of nanotubes, 10 parts of paraffin oil, 3 parts of zinc oxide, 3.5 parts of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, 1.5 parts of tripropenyl isocyanurate share. Among them, the Mooney viscosity of EPDM rubber (ML1+4, 125°C) is 28, the content of ethylene monomer is 48%, the content of the third monomer ethylidene norbornene is 7.8%; the carbon black is fast extrusion furnace black , with a particle size of 40nm; activated aluminum hydroxide is surface-modified activated aluminum hydroxide with a titanate coupling agent (tetrabutyl orthotitanate), with a mesh number of 5000 mesh and a purity of over 99.6%; multi-walled carbon nano The tube has a diameter of 10nm, a tube length of 20μm, and a purity of more than 98%; the crystal f...

Embodiment 3

[0044]A tracking-resistant EPDM sealing material, the raw materials of which include by weight: 100 parts of EPDM rubber, 60 parts of carbon black, 70 parts of activated aluminum hydroxide, 15 parts of nano-alumina, multi-walled carbon 20 parts of nanotubes, 15 parts of paraffin oil, 4 parts of zinc oxide, 3 parts of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, 1.5 parts of tripropenyl isocyanurate share. Among them, the Mooney viscosity of EPDM rubber (ML1+4, 125°C) is 25, the content of ethylene monomer is 53%, the content of the third monomer ethylidene norbornene is 6%; the carbon black is fast extrusion furnace black , the particle size is 40nm; the activated aluminum hydroxide is activated aluminum hydroxide surface modified by the silane coupling agent KH550, the mesh number is 5000 mesh, and the purity is above 99.6%; the multi-walled carbon nanotubes have a diameter of 10nm and a length of 20μm , with a purity of over 98%; the crystal form of nano-alumina is α phase...

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Abstract

The invention discloses a tracking-resistant ethylene propylene diene monomer sealing material and a preparation method thereof. In the prior art, the electrode sealing ring is made of the flame-retardant-system-free ethylene propylene diene monomer material, and the tracking is formed on the surface of the sealing ring, such that the ablation is formed on the sealing ring to cause the sealing failure so as to affect the safe operation of the whole current conversion valve. According to the present invention, the tracking resistance and the mechanical property of the ethylene propylene diene monomer are improved by adding the flame retardants of active aluminum hydroxide, nanometer alumina and multi-wall carbon nano-tubes, such that the problem in the prior art can be solved.

Description

Technical field: [0001] The invention relates to a sealing material, in particular to a tracking-resistant EPDM sealing material and a preparation method thereof. Background technique: [0002] Converter valve is one of the core equipment in DC transmission project. The converter valve cooling system is an important component of the converter, and it is responsible for cooling the components such as valve plates and reactors. Its safety and reliability are directly related to the safe and normal operation of the converter station. One of the main causes of water leakage in the cooling system of the converter valve is the corrosion of the sealing ring of the equalizing electrode. As deposits are continuously deposited on the surface of the voltage equalizing electrode, the resistance of the voltage equalizing electrode increases gradually. The thickness of the deposit attached to the equalizing electrode is not consistent, especially the deposition near the sealing ring is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08L91/06C08K13/06C08K9/06C08K3/04C08K3/22C08K5/14F16J9/28
CPCC08K2003/2227C08K2003/2296C08K2201/003C08K2201/004C08K2201/011C08K2201/014C08L23/16F16J9/28C08L91/06C08K13/06C08K9/06C08K3/04C08K3/22C08K3/041C08K5/14
Inventor 王振国建宝
Owner EXAMING & EXPERIMENTAL CENT OF ULTRAHIGH VOLTAGE POWER TRANSMISSION COMPANY CHINA SOUTHEN POWER GRID
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