CN109401614B - Performance repairing method for prolonging service life of silicone rubber - Google Patents

Performance repairing method for prolonging service life of silicone rubber Download PDF

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Publication number
CN109401614B
CN109401614B CN201811249623.7A CN201811249623A CN109401614B CN 109401614 B CN109401614 B CN 109401614B CN 201811249623 A CN201811249623 A CN 201811249623A CN 109401614 B CN109401614 B CN 109401614B
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parts
weight
silicon rubber
repairing
cleaning
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CN109401614A (en
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宋志强
宋利强
宋聚强
游传榜
王晓
吴少鹏
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Hebei Silicon Valley Chemical Co ltd
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Hebei Silicon Valley Chemical Co ltd
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    • C09D183/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen, and oxygen
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C73/00—Repairing of articles made from plastics or substances in a plastic state, e.g. of articles shaped or produced by using techniques covered by this subclass or subclass B29D
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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Abstract

A performance repairing method for prolonging the service life of silicon rubber belongs to the technical field of converter station insulator repairing, and comprises the steps of pre-cleaning, fine cleaning, pre-finishing, permeation repairing and establishing a new external insulation surface, wherein the pre-cleaning comprises the steps of cleaning surface ageing, removing cracks, removing dirt and removing a powdering layer on the silicon rubber to be treated; the fine cleaning is carried out by adopting an insulating cleaning agent; the pre-finishing adopts silicon rubber repairing putty to repair silicon rubber; the infiltration repairing adopts a silicon infiltration activating agent to carry out repairing and shaping; the new outer insulation surface is formed by coating a high-performance fluorosilicone rubber coating material on the surface of the silicon rubber subjected to permeation repair to form an outer sealing layer. The repairing method is simple, the repaired insulator recovers the original performance, the service life of the equipment can be prolonged, and the equipment can be ensured to continuously run safely and reliably.

Description

Performance repairing method for prolonging service life of silicone rubber
Technical Field
The invention belongs to the technical field of repair of insulators of converter stations, and relates to a performance repair method for prolonging the service life of silicon rubber.
Background
The configuration of the external insulation of the outdoor direct-current field of the converter station is the first problem faced by direct-current transmission engineering, and the safety operation of a direct-current transmission system is obviously influenced by the level of the external insulation of direct-current field equipment. The traditional porcelain insulation can not meet the requirement of direct current field equipment, the composite external insulation is inevitably selected as an outer sleeve of the direct current field equipment, and a wall bushing, a direct current PT (potential transformer), a CT (current transformer), a lightning arrester and a direct current voltage divider which are used in a direct current field of a +/-500 kV converter station all adopt silicon rubber composite insulators, and most of the silicon rubber composite insulators are liquid silicon rubber composite insulators. Compared with the traditional ceramic material, the silicon rubber composite material has light weight, good hydrophobicity and high pollution flashover voltage, improves the running safety of direct current field equipment, but along with the prolonging of the operation time of converter station equipment, the aging of the silicon rubber composite insulator material becomes an increasingly urgent problem. Therefore, the invention develops a composite insulator performance repairing method.
Disclosure of Invention
The invention aims to solve the problems and provides a performance repairing method for prolonging the service life of silicon rubber, so that the service life of the silicon rubber is prolonged.
The technical scheme adopted by the invention for realizing the purpose is as follows:
a performance repairing method for prolonging the service life of silicon rubber comprises pre-cleaning, fine cleaning, pre-finishing, infiltration repairing and establishing a new external insulation surface. The pre-cleaning comprises the steps of cleaning surface aging substances, removing cracks, removing dirt and removing a powdering layer of the silicon rubber to be treated; the fine washing adopts an insulating cleaning agent to clean the surface of the silicone rubber jacket, so as to achieve deep cleanness and drive adsorbed moisture; the pre-finishing refers to performing gap filling, curing, grinding and the like on defects, falling off, cracks, cavities, electric erosion channels and the like by using silicon rubber repairing putty; the infiltration repair adopts a silicon infiltration activating agent for repair and shaping, the silicon infiltration activating agent is fused with the substrate molecule level in a reverse infiltration mode according to the adsorption-capillary hole principle and the principle of forming a hydrogen bond with the hydroxyl at the aging depolymerization tail end, the aging surface end group is activated, and the chemical combination of a covalent bond and the hydrogen bond and the physical compatibility of the winding of a molecular chain segment are formed; the new outer insulation surface is established by coating a high-performance fluorosilicone rubber coating material on the surface of the silicon rubber subjected to pre-finishing and infiltration repairing to form an outer sealing layer firmly combined with the substrate, so that the hydrophobicity of the insulator silicon rubber jacket is recovered, and the durable protection of ultraviolet resistance, pollution resistance and weather resistance is provided.
The insulating cleaning agent comprises, by weight, 2-3 parts of bromopropane, 0.5-1 part of sodium methylsiliconate, 2-3 parts of No. 120 solvent oil, 1-2 parts of No. 150 solvent oil, 1-2 parts of cyclohexanol and 0.5-1 part of polyether modified polysiloxane. The polyether modified polysiloxane is obtained by condensing alkoxy silicone oil and hydroxyl terminated polyether.
The silicon rubber repairing putty comprises, by weight, 3-5 parts of hydroxyl-terminated polydimethylsiloxane, 1-3 parts of polyether modified polysiloxane, 0.1-0.5 part of aminopropyltriethoxysilane, 0.1-0.5 part of 3- (2, 3-epoxypropoxy) propyltriethoxysilane (KH-561), 1-2 parts of nano silicon dioxide, 1-2 parts of elastic atomic ash and 0.1-0.5 part of methyltrimethoxysilane.
The silicon penetration activator comprises 1-2 parts of hydroxyl silicone oil, 1-2 parts of amino modified silicone oil, 1-2 parts of diphenyl silanediol, 1-2 parts of 150# solvent oil, 1-2 parts of trichloroethane, 0.5-1 part of nano titanium dioxide, 0.1-0.5 part of methyl mercaptopropyl dimethoxysilane and 0.1-0.5 part of barium salt by weight; the barium salt is selected from one or a combination of more of barium chloride, barium carbonate and barium stearate. The silicon penetration activator has low surface tension, good spreadability, permeability and reactivity.
The high-performance fluorosilicone rubber coating material comprises, by mass, 2-3 parts of fluorosilicone rubber, 1-2 parts of organosilicon modified epoxy resin, 0.5-1 part of polyvinyl difluoride, 1-3 parts of hydroxyl-terminated polysiloxane, 0.5-1 part of hydrogen-containing silicone oil, 0.1-0.5 part of urea propyl triethoxysilane, 0.1-0.5 part of gamma-epoxy propoxy trimethoxysilane, 1-3 parts of fumed silica, 1-2 parts of decabromodiphenylethane, 1-2 parts of antimony trioxide and 1-3 parts of aluminum hydroxide.
The invention has the beneficial effects that:
the defects generated by the deterioration of the liquid silicone rubber material can be eliminated by selecting the composite insulator performance repairing material, the physical and chemical properties and the electrical performance of the composite insulator can be recovered, the outer sealing layer has excellent hydrophobicity and strong electric field and environmental aging resistance, the original performance of the surface of the insulator can be recovered by a reasonable repairing process, the service life of equipment can be prolonged, and the continuous safe and reliable operation of the equipment can be guaranteed. If the composite insulator is not subjected to aging repair of the insulator, only equipment disassembly can be selected to return to a manufacturing plant, or only the insulator composite outer sleeve is replaced by adopting machine and mold forming, the route is complex in technology, high in disassembly, transportation, installation and debugging cost, long in construction period and high in risk. Therefore, the insulator repairing process greatly saves the cost and improves the stable operation of the power system.
According to the invention, through the design of the insulating cleaning agent, the silicon permeation activator and the high-performance fluorosilicone rubber coating material and the control of the component proportion, the repairing treatment is carried out from three aspects, the outer sealing layer is formed through fine cleaning, activation and final design, the outer sealing layer is buckled in a ring-by-ring mode and is progressive layer by layer, and finally the repaired silicon rubber insulator has excellent performance.
Detailed Description
The liquid silicone rubber composite outer sleeve repairing strategy comprises the following aspects
1 selection of repair protocol
The ageing of the composite jacket material of the converter station equipment is not exactly equal to the ageing of the equipment. When the hydrophobicity of the composite outer sleeve material is weakened or lost and the deterioration phenomena of hardening, powdering, cracking and the like of the outer sleeve are not serious, if effective repairing measures are adopted, the performance of the liquid silicone rubber composite outer sleeve is recovered, the service life of the equipment can be prolonged, and the continuous safe and reliable operation of the equipment is ensured. When the liquid silicone rubber composite outer sleeve is seriously aged, the glass fiber reinforced plastic insulating cylinder can be damaged, and new composite insulating equipment needs to be replaced. Therefore, it is necessary to monitor the aging of the liquid silicone rubber composite casing and repair the casing in time.
For the liquid silicon rubber composite outer sleeve with serious aging damage, equipment can be selected to be disassembled and returned to a manufacturing plant to replace the glass fiber reinforced plastic insulating cylinder and the composite outer sleeve, or a machine and a die are adopted for molding to only replace the liquid silicon rubber composite outer sleeve. The route has the advantages of complex technology, high disassembly, transportation, installation and debugging cost, long construction period and high risk.
For moderate or below aging of liquid silicone rubber composite casings, the aging is induced from the surface, but the casing material with a surface below 1mm maintains almost intact electrical, physicochemical properties. Therefore, the high-performance organic silicon coating material can be adopted for field repair, the aging defect is eliminated, and the performance of the liquid silicon rubber composite outer sleeve of the converter station equipment is recovered.
The aging mechanism analysis of the liquid silicone rubber material shows that ultraviolet irradiation, electric field action and the like are main factors causing the aging of the liquid silicone rubber material, and the aging process is realized by breaking the lateral group and the main chain of polysiloxane; therefore, the fluorosilicone polymer is introduced into the coating material repaired on the aging site of the liquid silicone rubber composite outer sleeve, the carbon-fluorine bond (C-F) bond energy is 485KJ/mol, and the aging resistance of the repair material is improved.
2 liquid silicon rubber composite outer sleeve on-site repair
The field repair of the aging of the liquid silicon rubber composite jacket of the convertor station equipment comprises two aspects of materials and processes. The material design can eliminate the defect generated by the deterioration of the liquid silicone rubber material and recover the physical and chemical properties and the electrical properties of the liquid silicone rubber material, and the outer sealing layer has excellent hydrophobicity and strong electric field and environmental aging resistance. The field repair process should solve three problems:
(1) inspection and cleaning of composite jacket aging status
Comprehensively and systematically checking the aging state of the liquid silicone rubber composite jacket of the equipment, and grading the aging forms of different areas if necessary; cleaning the surface aged substance by a proper method, removing dirt at deep parts of cracks and gullies, removing the powdering layer, and carrying out fine cleaning by using an insulating cleaning agent, wherein the surface of the outer sleeve has no loose aged substance, dust, oil stain and water.
(2) Eliminating and modifying
The physical damage of the liquid silicon rubber composite outer sleeve is shaped by using repair cement (silicon rubber repair putty) to recover the appearance of the outer sleeve; the liquid silicone rubber material is mostly aged with cracks of different depths, and the composite outer sleeve is subjected to permeation repair by using an organic silicon permeation activator to activate the siloxane end group of the liquid silicone rubber, form intermolecular crosslinking fixation and recover the function of the composite outer sleeve.
(3) New external insulation surface
And coating a high-performance fluorosilicone rubber coating material on the surface of the liquid silicone rubber composite outer sleeve after the infiltration repair to form an outer sealing layer, wherein the fluorosilicone rubber sealing layer not only protects the liquid silicone rubber composite outer sleeve, but also provides a new outer insulating surface for equipment.
The present invention will be further described with reference to the following specific examples.
Detailed description of the preferred embodiments
Example 1
(1) Inspection and cleaning of composite insulator surface aging state
Comprehensively and systematically checking the aging state of the surface of the composite insulator of the equipment, and grading the aging forms of different areas: cleaning surface aging substances, removing dirt at deep parts of cracks and gullies, and removing a powdering layer;
the aging state is represented by the following properties measured: surface hydrophobicity, powdering layer thickness, specular gloss, tracking resistance, relative content of C, O and Si elements in the liquid silicone rubber, and pressure resistance value:
the surface hydrophobicity of the liquid silicone rubber is detected to be HC5 by adopting a water spray grading method (the hydrophobicity is divided into 7 grades, namely HC1, HC2, HC3, HC4, HC5, HC6 and HC7, wherein HC1 is completely hydrophobic, and HC7 is completely hydrophilic); measuring the thickness of the pulverized layer of the liquid silicone rubber by using a thickness gauge to be 0.28 mm; measuring the specular glossiness of the liquid silicone rubber to be 21 by adopting a glossiness meter; measuring the tracking resistance TMA2.5 of the liquid silicone rubber according to GB/T6553; measuring the relative contents of C, O and Si elements in the liquid silicone rubber by adopting X-ray photoelectron spectroscopy analysis, wherein the relative content of C element accounts for 35% of the total proportion of C, O, Si three elements; the withstand voltage value is tested according to the electrical test method of part 2 of GB/T775.2-2003 insulator test method, and the withstand voltage value is 20 KV.
(2) Fine washing
The insulating cleaning agent is used for fine cleaning, and loose aging substances, dust, oil stains, water and the like do not exist on the surface of the coat. The insulating cleaning agent comprises, by weight, 2 parts of bromopropane, 0.5 part of sodium methyl silanol, 2 parts of No. 120 solvent oil, 1 part of No. 150 solvent oil, 1 part of cyclohexanol and 0.5 part of polyether modified polysiloxane.
(3) Preliminary finishing
Restoring the appearance of the jacket, and filling, curing, polishing and the like of the defects, the falling, the cracks, the cavities, the electric erosion channels and the like by using silicon rubber repairing putty. The silicon rubber repairing putty comprises, by weight, 3 parts of hydroxyl-terminated polydimethylsiloxane, 1 part of polyether modified polysiloxane, 0.1 part of aminopropyltriethoxysilane, 0.1 part of 3- (2, 3-epoxypropoxy) propyltriethoxysilane (KH-561), 1 part of nano-silica, 1 part of elastic atomic ash and 0.1 part of methyltrimethoxysilane.
(4) Osmotic repair
The composite insulator is mostly aged with cracks with different depths, physical damage on the surface of the composite insulator is pre-finished by a silicon permeation activator, daub is repaired for shaping, siloxane end groups of liquid silicon rubber are activated, intermolecular crosslinking fixation is formed, and the function of the composite jacket is recovered. The silicon penetration activator comprises 2 parts of fluorosilicone rubber, 1 part of organic silicon modified epoxy resin, 0.5 part of polyvinyl difluoride, 1 part of hydroxyl-terminated polysiloxane, 0.5 part of hydrogen-containing silicone oil, 0.1 part of urea propyl triethoxysilane, 0.1 part of gamma-epoxy propoxy trimethoxysilane, 1 part of fumed silica, 1 part of decabromodiphenylethane, 1 part of antimony trioxide and 1 part of aluminum hydroxide in parts by weight.
(5) Establishing a new external insulating surface
The surface of the composite insulator after infiltration repair is coated with a high-performance fluorosilicone rubber coating material to form an outer sealing layer, the fluorosilicone rubber sealing layer not only protects the composite insulator, but also provides a new outer insulating surface of equipment, a fluorosilicone polymer is introduced, the carbon-fluorine bond (C-F) bond energy is 485KJ/mol, and the aging resistance of the repair material is improved. The high-performance fluorosilicone rubber coating material comprises 1 part of ethylene propylene rubber, 1 part of alicyclic epoxy resin, 2 parts of polytetrafluoroethylene, 2 parts of organic silicon, 2 parts of polysiloxane and 2 parts of polysilane.
Detecting the performance of the repaired silicon rubber insulator:
detecting the surface hydrophobicity of the liquid silicone rubber to be HC1 by adopting a water spraying classification method; measuring the thickness of the powdering layer of the liquid silicone rubber to be 0 by using a thickness gauge; measuring the specular glossiness of the liquid silicone rubber to be 70 by adopting a glossiness meter; measuring the tracking resistance TMA 4.5 of the liquid silicone rubber according to GB/T6553; measuring the relative contents of C, O and Si elements in the liquid silicone rubber by adopting X-ray photoelectron spectroscopy analysis, wherein the relative content of C element accounts for 50.8 percent of the total proportion of C, O, Si three elements; the withstand voltage value is tested according to the electrical test method of part 2 of GB/T775.2-2003 insulator test method, and the withstand voltage value is 55KV, which shows that the silicon rubber insulator repaired by the repairing method can have a higher withstand voltage value again.
Example 2
(1) Inspection and cleaning of composite insulator surface aging state
Comprehensively and systematically checking the aging state of the surface of the composite insulator of the equipment, and grading the aging forms of different areas: cleaning surface aging substances, removing dirt at deep parts of cracks and gullies, and removing a powdering layer;
the aging state is represented by the following properties measured: surface hydrophobicity, powdering layer thickness, specular gloss, tracking resistance, relative content of C, O and Si elements in the liquid silicone rubber, and pressure resistance value:
detecting the surface hydrophobicity of the liquid silicone rubber to be HC5 by adopting a water spraying classification method; measuring the thickness of the pulverization layer of the liquid silicone rubber by using a thickness gauge to be 0.25 mm; measuring the specular glossiness of the liquid silicone rubber to be 24 by adopting a glossiness meter; measuring the tracking resistance TMA2.8 of the liquid silicone rubber according to GB/T6553; measuring the relative contents of C, O and Si elements in the liquid silicone rubber by adopting X-ray photoelectron spectroscopy analysis, wherein the relative content of C element accounts for 32.3 percent of the total proportion of C, O, Si three elements; and (3) carrying out a withstand voltage value test according to the electrical test method of part 2 of GB/T775.2-2003 insulator test method, wherein the withstand voltage value is 24 KV.
(2) Fine washing
The insulating cleaning agent is used for fine cleaning, and loose aging substances, dust, oil stains, water and the like do not exist on the surface of the coat. The insulating cleaning agent comprises, by weight, 3 parts of bromopropane, 1 part of sodium methylsiliconate, 3 parts of No. 120 solvent oil, 2 parts of No. 150 solvent oil, 2 parts of cyclohexanol and 1 part of polyether modified polysiloxane.
(3) Preliminary finishing
Restoring the appearance of the jacket, and filling, curing, polishing and the like of the defects, the falling, the cracks, the cavities, the electric erosion channels and the like by using silicon rubber repairing putty. The silicon rubber repairing putty comprises, by weight, 5 parts of hydroxyl-terminated polydimethylsiloxane, 3 parts of polyether modified polysiloxane, 0.5 part of aminopropyltriethoxysilane, 0.5 part of 3- (2, 3-epoxypropoxy) propyltriethoxysilane (KH-561), 2 parts of nano silicon dioxide, 2 parts of elastic atomic ash and 0.5 part of methyltrimethoxysilane.
(4) Osmotic repair
The composite insulator is mostly aged with cracks with different depths, physical damage on the surface of the composite insulator is pre-finished by a silicon permeation activator, daub is repaired for shaping, siloxane end groups of liquid silicon rubber are activated, intermolecular crosslinking fixation is formed, and the function of the composite jacket is recovered. The silicon penetration activator comprises 2 parts of hydroxyl silicone oil, 2 parts of amino modified silicone oil, 2 parts of diphenyl silanediol, 2 parts of 150# solvent oil, 2 parts of trichloroethane, 1 part of nano titanium dioxide, 0.5 part of methyl mercaptopropyl dimethoxysilane and 0.5 part of barium salt in parts by weight.
(5) Establishing a new external insulating surface
The surface of the composite insulator after infiltration repair is coated with a high-performance fluorosilicone rubber coating material to form an outer sealing layer, the fluorosilicone rubber sealing layer not only protects the composite insulator, but also provides a new outer insulating surface of equipment, a fluorosilicone polymer is introduced, the carbon-fluorine bond (C-F) bond energy is 485KJ/mol, and the aging resistance of the repair material is improved. The high-performance fluorosilicone rubber coating material comprises, by weight, 3 parts of fluorosilicone rubber, 2 parts of organosilicon modified epoxy resin, 1 part of polyvinyl difluoride, 3 parts of hydroxyl-terminated polysiloxane, 1 part of hydrogen-containing silicone oil, 0.5 part of urea propyl triethoxysilane, 0.5 part of gamma-epoxy propoxy trimethoxysilane, 3 parts of fumed silica, 2 parts of decabromodiphenylethane, 2 parts of antimony trioxide and 3 parts of aluminum hydroxide.
Detecting the performance of the repaired silicon rubber insulator:
detecting the surface hydrophobicity of the liquid silicone rubber to be HC1 by adopting a water spraying classification method; measuring the specular gloss of the liquid silicone rubber to be 68 by using a gloss meter; measuring the tracking resistance TMA 4.5 of the liquid silicone rubber according to GB/T6553; measuring the relative contents of C, O and Si elements in the liquid silicone rubber by adopting X-ray photoelectron spectroscopy analysis, wherein the relative content of C element accounts for 51.2 percent of the total proportion of C, O, Si three elements; and (3) carrying out a withstand voltage value test according to the electrical test method of part 2 of GB/T775.2-2003 insulator test method, wherein the withstand voltage value is 56KV, which shows that the silicon rubber insulator repaired by the repairing method can have a higher withstand voltage value again.
Comparative example 1
(1) Inspection and cleaning of composite insulator surface aging state
Comprehensively and systematically checking the aging state of the surface of the composite insulator of the equipment, and grading the aging forms of different areas: cleaning surface aging substances, removing dirt at deep parts of cracks and gullies, and removing a powdering layer;
the aging state is represented by the following properties measured: surface hydrophobicity, powdering layer thickness, specular gloss, tracking resistance, relative content of C, O and Si elements in the liquid silicone rubber, and pressure resistance value:
detecting the surface hydrophobicity of the liquid silicone rubber to be HC5 by adopting a water spraying classification method; measuring the thickness of the pulverization layer of the liquid silicone rubber by using a thickness gauge to be 0.27 mm; measuring the specular gloss of the liquid silicone rubber to be 22 by using a gloss meter; measuring the tracking resistance TMA2.7 of the liquid silicone rubber according to GB/T6553; measuring the relative contents of C, O and Si elements in the liquid silicone rubber by adopting X-ray photoelectron spectroscopy analysis, wherein the relative content of C element accounts for 33.6 percent of the total proportion of C, O, Si three elements; the withstand voltage value is tested according to the electrical test method of part 2 of GB/T775.2-2003 insulator test method, and the withstand voltage value is 22 KV.
(2) Fine washing
And (4) carrying out fine washing by using alcohol.
(3) Preliminary finishing
Restoring the appearance of the jacket, and filling, curing, polishing and the like of the defects, the falling, the cracks, the cavities, the electric erosion channels and the like by using silicon rubber repairing putty. The silicon rubber repairing putty comprises, by weight, 3 parts of hydroxyl-terminated polydimethylsiloxane, 1 part of polyether modified polysiloxane, 0.1 part of aminopropyltriethoxysilane, 0.1 part of 3- (2, 3-epoxypropoxy) propyltriethoxysilane (KH-561), 1 part of nano-silica, 1 part of elastic atomic ash and 0.1 part of methyltrimethoxysilane.
(4) Osmotic repair
The physical damage to the surface of the composite insulator is pre-finished by a silicon penetration activator, wherein the silicon penetration activator comprises 1 part of hydroxyl silicone oil, 1 part of amino modified silicone oil, 1 part of diphenyl silanediol, 1 part of 150# solvent oil, 1 part of trichloroethane, 0.5 part of nano titanium dioxide, 0.1 part of methyl mercaptopropyl dimethoxysilane and 0.1 part of barium salt in parts by weight.
(5) New external insulation surface
And coating a high-performance fluorosilicone rubber coating material on the surface of the composite insulator after the infiltration repair to form an outer closed layer (namely, a newly-built outer insulating surface). The high-performance fluorosilicone rubber coating material comprises 2 parts of fluorosilicone rubber, 1 part of organic silicon modified epoxy resin, 0.5 part of polyvinyl difluoride, 1 part of hydroxyl-terminated polysiloxane, 0.5 part of hydrogen-containing silicone oil, 0.1 part of urea propyl triethoxysilane, 0.1 part of gamma-epoxy propoxy trimethoxysilane, 1 part of fumed silica, 1 part of decabromodiphenylethane, 1 part of antimony trioxide and 1 part of aluminum hydroxide.
Detecting the performance of the repaired silicon rubber insulator:
detecting the surface hydrophobicity of the liquid silicone rubber to be HC3 by adopting a water spraying classification method; measuring the specular glossiness of the liquid silicone rubber to be 40 by adopting a glossiness meter; measuring the tracking resistance TMA 3.4 of the liquid silicone rubber according to GB/T6553; measuring the relative contents of C, O and Si elements in the liquid silicone rubber by adopting X-ray photoelectron spectroscopy analysis, wherein the relative content of C element accounts for 42.1 percent of the total proportion of C, O, Si three elements; the withstand voltage value is tested according to the electrical test method of part 2 of GB/T775.2-2003 insulator test method, and the withstand voltage value is 40 KV.
Comparative example 2
(1) Inspection and cleaning of composite insulator surface aging state
Comprehensively and systematically checking the aging state of the surface of the composite insulator of the equipment, and grading the aging forms of different areas: cleaning surface aging substances, removing dirt at deep parts of cracks and gullies, and removing a powdering layer;
the aging state is represented by the following properties measured: surface hydrophobicity, powdering layer thickness, specular gloss, tracking resistance, relative content of C, O and Si elements in the liquid silicone rubber, and pressure resistance value:
detecting the surface hydrophobicity of the liquid silicone rubber to be HC5 by adopting a water spraying classification method; measuring the thickness of the pulverization layer of the liquid silicone rubber by using a thickness gauge to be 0.25 mm; measuring the specular glossiness of the liquid silicone rubber to be 24 by adopting a glossiness meter; measuring the tracking resistance TMA2.8 of the liquid silicone rubber according to GB/T6553; measuring the relative contents of C, O and Si elements in the liquid silicone rubber by adopting X-ray photoelectron spectroscopy analysis, wherein the relative content of C element accounts for 33.2 percent of the total proportion of C, O, Si three elements; the withstand voltage value is tested according to the electrical test method of part 2 of GB/T775.2-2003 insulator test method, and the withstand voltage value is 22.8 KV.
(2) Fine washing
The insulating cleaning agent is used for fine cleaning, and loose aging substances, dust, oil stains, water and the like do not exist on the surface of the coat. The insulating cleaning agent comprises, by weight, 2 parts of bromopropane, 0.5 part of sodium methyl silanol, 2 parts of No. 120 solvent oil, 1 part of No. 150 solvent oil, 1 part of cyclohexanol and 0.5 part of polyether modified polysiloxane.
(3) Preliminary finishing
Restoring the appearance of the jacket, and filling, curing, polishing and the like of the defects, the falling, the cracks, the cavities, the electric erosion channels and the like by using silicon rubber repairing putty. The silicon rubber repairing putty comprises, by weight, 3 parts of hydroxyl-terminated polydimethylsiloxane, 1 part of polyether modified polysiloxane, 0.1 part of aminopropyltriethoxysilane, 0.1 part of 3- (2, 3-epoxypropoxy) propyltriethoxysilane (KH-561), 1 part of nano-silica, 1 part of elastic atomic ash and 0.1 part of methyltrimethoxysilane.
(4) New external insulation surface
And coating a high-performance fluorosilicone rubber coating material on the surface of the pre-finished composite insulator to form an outer sealing layer. The high-performance fluorosilicone rubber coating material comprises 2 parts of fluorosilicone rubber, 1 part of organic silicon modified epoxy resin, 0.5 part of polyvinyl difluoride, 1 part of hydroxyl-terminated polysiloxane, 0.5 part of hydrogen-containing silicone oil, 0.1 part of urea propyl triethoxysilane, 0.1 part of gamma-epoxy propoxy trimethoxysilane, 1 part of fumed silica, 1 part of decabromodiphenylethane, 1 part of antimony trioxide and 1 part of aluminum hydroxide.
Detecting the performance of the repaired silicon rubber insulator:
detecting the surface hydrophobicity of the liquid silicone rubber to be HC3 by adopting a water spraying classification method; measuring the specular glossiness of the liquid silicone rubber by using a glossiness meter to be 42; measuring the tracking resistance TMA2.7 of the liquid silicone rubber according to GB/T6553; measuring the relative contents of C, O and Si elements in the liquid silicone rubber by adopting X-ray photoelectron spectroscopy analysis, wherein the relative content of C element accounts for 43.5 percent of the total proportion of C, O, Si three elements; the withstand voltage value is tested according to the electrical test method of part 2 of GB/T775.2-2003 insulator test method, and the withstand voltage value is 33 KV.
Comparative example 3
(1) Inspection and cleaning of composite insulator surface aging state
Comprehensively and systematically checking the aging state of the surface of the composite insulator of the equipment, and grading the aging forms of different areas: cleaning surface aging substances, removing dirt at deep parts of cracks and gullies, and removing a powdering layer;
the aging state is represented by the following properties measured: surface hydrophobicity, powdering layer thickness, specular gloss, tracking resistance, relative content of C, O and Si elements in the liquid silicone rubber, and pressure resistance value:
detecting the surface hydrophobicity of the liquid silicone rubber to be HC5 by adopting a water spraying classification method; measuring the thickness of the pulverized layer of the liquid silicone rubber by using a thickness gauge to be 0.28 mm; measuring the specular glossiness of the liquid silicone rubber to be 23 by adopting a glossiness meter; measuring the tracking resistance TMA2.8 of the liquid silicone rubber according to GB/T6553; measuring the relative contents of C, O and Si elements in the liquid silicone rubber by adopting X-ray photoelectron spectroscopy analysis, wherein the relative content of C element accounts for 34.2 percent of the total proportion of C, O, Si three elements; the withstand voltage value is tested according to the electrical test method in part 2 of GB/T775.2-2003 insulator test method, and the withstand voltage value is 21.5 KV.
(2) Fine washing
The insulating cleaning agent is used for fine cleaning, and loose aging substances, dust, oil stains, water and the like do not exist on the surface of the coat. The insulating cleaning agent comprises, by weight, 2 parts of bromopropane, 0.5 part of sodium methyl silanol, 2 parts of No. 120 solvent oil, 1 part of No. 150 solvent oil, 1 part of cyclohexanol and 0.5 part of polyether modified polysiloxane.
(3) Preliminary finishing
Restoring the appearance of the jacket, and filling, curing, polishing and the like of the defects, the falling, the cracks, the cavities, the electric erosion channels and the like by using silicon rubber repairing putty. The silicon rubber repairing putty comprises, by weight, 3 parts of hydroxyl-terminated polydimethylsiloxane, 1 part of polyether modified polysiloxane, 0.1 part of aminopropyltriethoxysilane, 0.1 part of 3- (2, 3-epoxypropoxy) propyltriethoxysilane (KH-561), 1 part of nano-silica, 1 part of elastic atomic ash and 0.1 part of methyltrimethoxysilane.
(4) Osmotic repair
The physical damage to the surface of the composite insulator is pre-finished by a silicon penetration activator, wherein the silicon penetration activator comprises 1 part of hydroxyl silicone oil, 1 part of amino modified silicone oil, 1 part of diphenyl silanediol, 1 part of 150# solvent oil, 1 part of trichloroethane, 0.5 part of nano titanium dioxide, 0.1 part of methyl mercaptopropyl dimethoxysilane and 0.1 part of barium salt in parts by weight.
(5) New external insulation surface
And coating PRTV anti-pollution flashover composite paint on the surface of the composite insulator after the infiltration repair to form a new outer insulating layer.
Detecting the performance of the repaired silicon rubber insulator:
detecting the surface hydrophobicity of the liquid silicone rubber to be HC3 by adopting a water spraying classification method; measuring the specular glossiness of the liquid silicone rubber to be 45 by adopting a glossiness meter; TMA 3.6 of the tracking resistance and the electrical erosion resistance of the liquid silicone rubber is measured according to GB/T6553; measuring the relative contents of C, O and Si elements in the liquid silicone rubber by adopting X-ray photoelectron spectroscopy analysis, wherein the relative content of C element accounts for 43.6 percent of the total proportion of C, O, Si three elements; the withstand voltage value is tested according to the electrical test method in part 2 of GB/T775.2-2003 insulator test method, and the withstand voltage value is 43 KV.
According to the analysis and comparison, the performance repairing method for prolonging the service life of the silicon rubber is adopted, and the repaired silicon rubber insulator has good performance recovery and can have a higher withstand voltage value again after pre-cleaning, fine cleaning of an insulating cleaning agent, pre-finishing of a silicon permeation activator and new construction of an outer insulating surface by using a high-performance fluorosilicone rubber coating material.
Comparative example 4
(1) Inspection and cleaning of composite insulator surface aging state
Comprehensively and systematically checking the aging state of the surface of the composite insulator of the equipment, and grading the aging forms of different areas: cleaning surface aging substances, removing dirt at deep parts of cracks and gullies, and removing a powdering layer;
the aging state is represented by the following properties measured: surface hydrophobicity, powdering layer thickness, specular gloss, tracking resistance, relative content of C, O and Si elements in the liquid silicone rubber, and pressure resistance value:
detecting the surface hydrophobicity of the liquid silicone rubber to be HC5 by adopting a water spraying classification method; measuring the thickness of the pulverized layer of the liquid silicone rubber by using a thickness gauge to be 0.28 mm; measuring the specular glossiness of the liquid silicone rubber to be 23 by adopting a glossiness meter; measuring the tracking resistance TMA2.8 of the liquid silicone rubber according to GB/T6553; measuring the relative contents of C, O and Si elements in the liquid silicone rubber by adopting X-ray photoelectron spectroscopy analysis, wherein the relative content of C element accounts for 35.1 percent of the total proportion of C, O, Si three elements; the withstand voltage value is tested according to the electrical test method of part 2 of GB/T775.2-2003 insulator test method, and the withstand voltage value is 22 KV.
(2) Fine washing
The insulating cleaning agent is used for fine cleaning, and loose aging substances, dust, oil stains, water and the like do not exist on the surface of the coat. The insulating cleaning agent comprises, by weight, 2 parts of bromopropane, 0.5 part of sodium methyl silanol, 2 parts of No. 120 solvent oil, 1 part of No. 150 solvent oil, 1 part of cyclohexanol and 0.5 part of polyether modified polysiloxane.
(3) Osmotic repair
The physical damage to the surface of the composite insulator is pre-finished by a silicon penetration activator, wherein the silicon penetration activator comprises 1 part of hydroxyl silicone oil, 1 part of amino modified silicone oil, 1 part of diphenyl silanediol, 1 part of 150# solvent oil, 1 part of trichloroethane, 0.5 part of nano titanium dioxide, 0.1 part of methyl mercaptopropyl dimethoxysilane and 0.1 part of barium salt in parts by weight.
(4) Establishing a new external insulating surface
And coating a high-performance fluorosilicone rubber coating material on the surface of the pre-finished composite insulator to form an outer sealing layer. The high-performance fluorosilicone rubber coating material comprises 2 parts of fluorosilicone rubber, 1 part of organic silicon modified epoxy resin, 0.5 part of polyvinyl difluoride, 1 part of hydroxyl-terminated polysiloxane, 0.5 part of hydrogen-containing silicone oil, 0.1 part of urea propyl triethoxysilane, 0.1 part of gamma-epoxy propoxy trimethoxysilane, 1 part of fumed silica, 1 part of decabromodiphenylethane, 1 part of antimony trioxide and 1 part of aluminum hydroxide.
Detecting the performance of the repaired silicon rubber insulator:
detecting the surface hydrophobicity of the liquid silicone rubber to be HC3 by adopting a water spraying classification method; measuring the specular gloss of the liquid silicone rubber by using a gloss meter to be 43; TMA3.5 is used for measuring the tracking resistance and the electrical erosion resistance of the liquid silicone rubber according to GB/T6553; measuring the relative contents of C, O and Si elements in the liquid silicone rubber by adopting X-ray photoelectron spectroscopy analysis, wherein the relative content of C element accounts for 40.3 percent of the total proportion of C, O, Si three elements; the withstand voltage value is tested according to the electrical test method in part 2 of GB/T775.2-2003 insulator test method, and the withstand voltage value is 37 KV.
According to the analysis and comparison, the performance repairing method for prolonging the service life of the silicon rubber is adopted, and the repaired silicon rubber insulator has good performance recovery and can have a higher withstand voltage value again by utilizing the high-performance fluorosilicone rubber coating material to newly construct the outer insulating surface through pre-cleaning, fine cleaning of the insulating cleaning agent, pre-finishing and permeation repairing.

Claims (3)

1. A performance repairing method for prolonging the service life of silicon rubber comprises the steps of pre-cleaning, fine cleaning, pre-finishing, permeation repairing and establishing a new external insulation surface, and is characterized in that the pre-cleaning comprises the steps of cleaning surface ageing, removing cracks, removing dirt and removing a pulverization layer on the silicon rubber to be treated; the fine cleaning adopts an insulating cleaning agent to clean the surface of the silicone rubber jacket; the pre-finishing adopts silicon rubber repairing putty to repair silicon rubber; the silicon rubber is repaired and shaped by adopting a silicon permeation activator in the permeation repair, wherein the silicon permeation activator comprises 1-2 parts by weight of hydroxyl silicone oil, 1-2 parts by weight of amino modified silicone oil, 1-2 parts by weight of diphenyl silanediol, 1-2 parts by weight of 150# solvent oil, 1-2 parts by weight of trichloroethane, 0.5-1 part by weight of nano titanium dioxide, 0.1-0.5 part by weight of methyl mercaptopropyl dimethoxysilane and 0.1-0.5 part by weight of barium salt; the new outer insulation surface is established by coating a high-performance fluorosilicone rubber coating material on the surface of the silicon rubber subjected to permeation repair to form an outer sealing layer;
the insulating cleaning agent comprises, by weight, 2-3 parts of bromopropane, 0.5-1 part of sodium methylsiliconate, 2-3 parts of No. 120 solvent oil, 1-2 parts of No. 150 solvent oil, 1-2 parts of cyclohexanol and 0.5-1 part of polyether modified polysiloxane;
the high-performance fluorosilicone rubber coating material comprises, by mass, 2-3 parts of fluorosilicone rubber, 1-2 parts of organosilicon modified epoxy resin, 0.5-1 part of polyvinyl difluoride, 1-3 parts of hydroxyl-terminated polysiloxane, 0.5-1 part of hydrogen-containing silicone oil, 0.1-0.5 part of urea propyl triethoxysilane, 0.1-0.5 part of gamma-epoxy propoxy trimethoxysilane, 1-3 parts of fumed silica, 1-2 parts of decabromodiphenylethane, 1-2 parts of antimony trioxide and 1-3 parts of aluminum hydroxide.
2. The method for repairing performance of silicon rubber according to claim 1, wherein the silicon rubber repair putty comprises 3-5 parts by weight of hydroxyl-terminated polydimethylsiloxane, 1-3 parts by weight of polyether modified polysiloxane, 0.1-0.5 part by weight of aminopropyltriethoxysilane, 0.1-0.5 part by weight of 3- (2, 3-glycidoxy) propyltriethoxysilane (KH-561), 1-2 parts by weight of nano-silica, 1-2 parts by weight of elastic atomic ash and 0.1-0.5 part by weight of methyltrimethoxysilane.
3. The method for repairing the performance of the silicon rubber used for prolonging the service life of the silicon rubber as claimed in claim 1, wherein the barium salt is selected from one or a combination of barium chloride and barium nitrate.
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