CN110003843B - Electric composite insulator repairing adhesive and preparation method thereof - Google Patents

Electric composite insulator repairing adhesive and preparation method thereof Download PDF

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Publication number
CN110003843B
CN110003843B CN201910270975.9A CN201910270975A CN110003843B CN 110003843 B CN110003843 B CN 110003843B CN 201910270975 A CN201910270975 A CN 201910270975A CN 110003843 B CN110003843 B CN 110003843B
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parts
composite insulator
silane
electric composite
coupling agent
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CN110003843A (en
Inventor
王建辉
赵悦菊
滕济林
夏益青
苗文华
张培林
赵春风
刘杨
郑永立
李星伟
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Beijing Guodian Futong Science and Technology Development Co Ltd
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Beijing Guodian Futong Science and Technology Development Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/04—Non-macromolecular additives inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
    • C09J183/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2217—Oxides; Hydroxides of metals of magnesium
    • C08K2003/2224—Magnesium hydroxide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2227—Oxides; Hydroxides of metals of aluminium
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/38—Boron-containing compounds
    • C08K2003/387—Borates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Organic Insulating Materials (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention discloses an electric composite insulator repairing adhesive and a preparation method thereof, and relates to the technical field of adhesives. The electric composite insulator repairing glue comprises the following raw materials, by weight, 80-200 parts of polysiloxane, 5-40 parts of silane modified polyether prepolymer, 2-30 parts of white carbon black, 40-280 parts of flame retardant, 5-30 parts of cross-linking agent, 10-50 parts of coupling agent and 0.1-3 parts of catalyst; preferably, the polysiloxane is a hydroxyl terminated polydimethylsiloxane. The preparation method of the electric composite insulator repairing glue takes the formula as a raw material, and the prepared repairing glue has good weather resistance and good cohesiveness, can be quickly cured at a low temperature, and has good compatibility with a composite insulator body material.

Description

Electric composite insulator repairing adhesive and preparation method thereof
Technical Field
The invention relates to the technical field of adhesives, and particularly relates to an electric power composite insulator repairing adhesive and a preparation method thereof.
Background
The electric power industry relates to the major industry of the national civilization, and the safe and stable operation of an electric power system is the basic guarantee of the national Tai Min's safety. The insulator is a key product for improving the insulation stability of outdoor power transmission and transformation facilities, wherein the composite insulator is synthesized by silicon rubber and filler, has light weight and high insulation strength, and is widely applied to high-voltage power transmission.
Due to long-term outdoor service, the composite insulator is subjected to ultraviolet aging, wind and sand abrasion, high and low temperature aging, ablation aging of leakage current and electric arc, and aging phenomena such as cracking, pulverization, erosion of pot holes, large-area shed falling and the like gradually occur due to pollution of certain industrial areas, acid rain, high conductivity fog and the like in coastal areas. The change of the umbrella skirt causes the electrical insulation performance of the insulator to be greatly reduced, and under the synergistic effect of the wetting action of severe environments such as dense fog, rain, snow, frost and the like and the leakage current of the operating voltage, arc discharge is very easy to occur, so that pollution flashover accidents are caused. At present, due to the fact that power failure time is short, replacement procedures are complex, and replacement and repair work of the power composite insulator is difficult to develop, the simplest repair and repair mode is to use glue with good compatibility and high insulation strength to adhere a cracked umbrella skirt, seal an ablated pot hole, repair and renovate a part of the pulverized and cracked surface of the umbrella skirt, but the special repair material is not available in the market.
At present, building sealants and structural sealants are relatively close to those in the existing products, but the building sealants are designed and developed by combining the application conditions of the building industry, wherein a plurality of performance indexes are not suitable for repairing composite insulators, for example, the building sealants are poor in flowability, and the repairing process is relatively difficult to operate. In addition, most building sealants have no flame retardance or low flame retardance, which is a fatal defect for electric external insulation materials; thirdly, the curing time of the building sealant is usually longer, especially under low temperature conditions, which is almost impossible for insulator repair with short power off time and high-altitude operation. Finally, the compatibility between the matrix resin used by the building adhesive and the material of the composite insulator is poor, so that the problem of stress concentration is easily caused; although the bonding strength can be satisfied, the weather resistance is not good, and the working condition requirement of long-term outdoor service is difficult to satisfy.
Disclosure of Invention
The invention aims to provide a repairing adhesive for an electric composite insulator, which is specially used for the electric composite insulator, has good electric insulation strength, flame retardance and flowing constructability, and can realize the effect of quick bonding and sealing at a lower temperature.
The invention also aims to provide a preparation method of the repair adhesive for the electric composite insulator, which is simple and feasible, and the prepared repair adhesive is suitable for the electric composite insulator.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The invention provides an electric composite insulator repairing adhesive which comprises, by weight, 80-200 parts of polysiloxane, 5-40 parts of silane modified polyether prepolymer, 2-30 parts of white carbon black, 40-280 parts of flame retardant, 5-30 parts of cross-linking agent, 10-50 parts of coupling agent and 0.1-3 parts of catalyst;
preferably, the polysiloxane is a hydroxyl terminated polydimethylsiloxane.
The invention also provides a preparation method of the electric composite insulator repairing glue, which comprises the following steps:
uniformly mixing polysiloxane, silane modified polyether prepolymer, white carbon black, flame retardant, crosslinking agent, coupling agent and catalyst.
The embodiment of the invention provides a repairing adhesive for an electric composite insulator, which has the beneficial effects that: the hydroxyl-terminated polydimethylsiloxane, the silane modified polyether prepolymer, the white carbon black and the flame retardant are used as main raw materials, and the crosslinking agent, the coupling agent and the catalyst are matched, so that the obtained repair adhesive has the following advantages: (1) the coating has good weather resistance and is suitable for outdoor use; (2) the material has good compatibility with the material of the composite insulator body, and the cured material has the same hardness and elasticity with the material of the body, so that the phenomenon of stress or field intensity concentration is not easy to cause; (3) the overall adhesion of the repair adhesive is strong, and the curing rate is high at low temperature.
The invention also provides a preparation method of the electric composite insulator repairing adhesive, the formula of the electric composite insulator repairing adhesive is used as a raw material, the method is simple and easy to implement, the prepared adhesive has good weather resistance and good cohesiveness, can be quickly cured at a low temperature, and has good compatibility with a composite insulator body material.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The following describes the repair adhesive for the electric composite insulator and the preparation method thereof provided by the embodiment of the invention.
The electric composite insulator repairing adhesive provided by the embodiment of the invention comprises the following raw materials, by weight, 80-200 parts of polysiloxane, 5-40 parts of silane modified polyether prepolymer, 2-30 parts of white carbon black, 40-280 parts of flame retardant, 5-30 parts of cross-linking agent, 10-50 parts of coupling agent and 0.1-3 parts of catalyst; preferably, the polysiloxane is a hydroxyl terminated polydimethylsiloxane.
In particular, the polysiloxane may be of another type, such as polymethylphenylsiloxane, but the use of hydroxy-terminated polydimethylsiloxane is less costly and performs well.
The formula is adopted as the raw material, so that various performances of the repairing adhesive can be obviously improved, and the repairing adhesive is a special adhesive for the electric power composite insulator. The obtained repair adhesive has the following advantages: (1) the coating has good weather resistance and is suitable for outdoor use; (2) the material has good compatibility with the material of the composite insulator body, and the cured material has the same hardness and elasticity with the material of the body, so that the phenomenon of stress or field intensity concentration is not easy to cause; (3) the overall adhesion of the repair adhesive is strong, and the curing rate is high at low temperature.
The excellent weather resistance is probably due to the polysiloxane insulating material in the formula, so that the prepared adhesive is suitable for outdoor use and has good weather resistance; the compatibility with the material of the composite insulator body is good, which is probably because the molecular structure of the polysiloxane insulating material in the formula is similar to that of the silicon rubber material of the composite insulator body; the adhesion and the rapid low-temperature curing performance are the effects which can be achieved by the integral formula, the most critical is probably the use of the silane modified polyether prepolymer, and the addition of the coupling agent and the catalyst also enhances the adhesion of the material and a substrate and the stability of the whole system.
The inventor further optimizes the use amount of each component in the formula, and preferably, the raw materials of the electric composite insulator repair adhesive comprise 80-150 parts of hydroxyl-terminated polydimethylsiloxane, 10-30 parts of silane modified polyether prepolymer, 5-20 parts of white carbon black, 50-200 parts of flame retardant, 8-15 parts of cross-linking agent, 20-40 parts of coupling agent and 0.2-2 parts of catalyst. The inventor finds that the comprehensive performance, particularly the bonding performance and the stability of the repair adhesive can be further improved by controlling the dosage of each component in the formula within the range.
Specifically, the hydroxyl-terminated polydimethylsiloxane and the silane-modified polyether prepolymer are both commercially available raw materials, for example, the hydroxyl-terminated polydimethylsiloxane is purchased from Shandong Dayi chemical industry Co., Ltd, the silane-modified polyether prepolymer is purchased from Jiangsu Ruiyang Antai New Material Co., Ltd, and the silane is modified into polyether with trimethoxy end capping, triethoxy end capping or dimethoxy and diethoxy mixed end capping. The white carbon black is hydrophobic silicon dioxide, and the specific surface area of the white carbon black is 100-400 m2And/g, the mechanical property of the repair adhesive is influenced by the fact that the specific surface area of the white carbon black is too large or too small.
Preferably, the hydroxyl-terminated polydimethylsiloxane is selected from one or more of adhesives with the viscosity of 5000-. The viscosity of the silane-modified polyether prepolymer was 5000-. The molecular weights of the hydroxyl-terminated polydimethylsiloxane and the silane modified polyether prepolymer can influence the viscosity, and the excessive or insufficient molecular weights of the hydroxyl-terminated polydimethylsiloxane and the silane modified polyether prepolymer can influence the bonding performance and the low-temperature curing rate of the finally obtained repair adhesive.
Further preferably, the coupling agent is selected from one or more of gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, vinyltris (2-methoxyethoxy) silane, gamma-aminopropyltriethoxysilane, N- (. beta. -aminoethyl) -gamma-aminopropylmethyldimethoxysilane and gamma-aminoethylaminopropyltrimethoxysilane. The inventor finds that the coupling agent is most suitable for the electric composite insulator by selecting the raw materials, so that the finally obtained repair adhesive has ideal bonding performance.
Specifically, the flame retardant is selected from one or more of aluminum hydroxide, magnesium hydroxide, quartz powder, aluminum oxide, zinc borate, decabromodiphenyl ether, ammonium polyphosphate, hydrotalcite and antimony trioxide. The flame retardant is most suitable to be selected, and is suitable for the electric composite insulator under the condition of controlling the using amount of the flame retardant. However, the amount of the flame retardant needs to be regulated, and too little amount of the flame retardant affects the flame retardant performance of the repair adhesive, and too much amount of the flame retardant affects the construction of the repair adhesive.
Specifically, the catalyst is selected from one or more of dibutyltin diacetate, dibutyltin dilaurate, chelated tin and stannous octoate. The catalyst is added to improve the curing rate of the repair adhesive, so that the repair adhesive can be rapidly cured at low temperature to adapt to the repair process of the electric composite insulator.
Specifically, the crosslinking agent is selected from one or more of methyl tributyl ketoximino silane, vinyl tributyl ketoximino silane, tetrabutoximino silane and methyl triacetoxy silane. The addition of the cross-linking agent mainly improves the bonding strength of the repair adhesive, and the use of the cross-linking agents adopts the raw materials such as the hydroxyl polydimethylsiloxane at the matched end, the silane modified polyether prepolymer and the like, so that the bonding strength of the repair adhesive can be remarkably improved.
Preferably, the raw materials of the electric composite insulator repairing glue also comprise 0.2-2 parts of ultraviolet absorbent, 1-20 parts of plasticizer and 0.5-5 parts of leveling agent; more preferably, the ultraviolet absorbent is 0.5-1.5 parts, the plasticizer is 2-10 parts, and the leveling agent is 1-5 parts. The plasticizer and the leveling agent are mainly prepared from matched hydroxyl polydimethylsiloxane, silane modified polyether prepolymer and other raw materials, and can enhance the fluidity and the leveling property of the system and form a flat and smooth surface in repair.
Specifically, the ultraviolet absorbent is a benzotriazole compound. The leveling agent is polyether modified polysiloxane. The plasticizer is selected from any one or more of alcohol plasticizers, ester plasticizers and alkyl-terminated polysiloxane, and is preferably alkyl-terminated polysiloxane; preferably, the viscosity of the alkyl-terminated polysiloxane is 500-500000 mPas. The plasticizer and the leveling agent are selected mainly by considering that the fluidity and the leveling property of the system are increased on the premise of not influencing the low-temperature curing property of the repair adhesive, and the raw materials are all suitable.
Specifically, the alkyl-terminated polysiloxane is a commercially available raw material, available from Dai chemical industries, Inc., Shandong.
In some embodiments, in order to meet different process requirements, the raw material of the electric composite insulator repair adhesive further comprises 1-8 parts of pigment, wherein the pigment is iron oxide red and/or titanium dioxide.
The embodiment of the invention also provides a preparation method of the electric composite insulator repairing glue, which comprises the following steps: uniformly mixing hydroxyl-terminated polydimethylsiloxane, silane modified polyether prepolymer, white carbon black, flame retardant, cross-linking agent, coupling agent and catalyst. In further embodiments, the raw materials further include an ultraviolet absorber, a plasticizer, and a leveling agent. The direct mixing mode is adopted, and the method is simple and easy to implement.
Preferably, the preparation method of the electric composite insulator repairing glue comprises the following steps: uniformly mixing the coupling agent, heating and refluxing, and then cooling to obtain a coupling agent reflux object; mixing hydroxyl-terminated polydimethylsiloxane, silane modified polyether prepolymer, white carbon black and a flame retardant, and then mixing the mixture for 3-5h at the temperature of 100-140 ℃ to obtain a primary mixed rubber; grinding the primarily mixed glue to obtain base glue, and then mixing the base glue, the cross-linking agent, the coupling agent reflux and the catalyst.
Compared with the direct mixing method, the method of mixing the coupling agent and other raw materials can further improve the bonding performance of the repair adhesive.
Preferably, the heating reflux process of the coupling agent is reflux at the temperature of 110-130 ℃ for 0.5-1.5 h. The coupling agent can be well and uniformly mixed at the temperature of about 120 ℃, and the bonding strength of the repair adhesive is improved. More preferably, the mixing in each step is performed under vacuum, and may be protected with nitrogen.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The embodiment provides an electric power composite insulator repairing adhesive which comprises the following raw materials in parts by weight: 80 parts of hydroxyl-terminated polydimethylsiloxane with the viscosity of 5000mPa.s, 5 parts of silane modified polyether prepolymer with the viscosity of 5000mPa.s and the specific surface area of 400cm22 parts of white carbon black per gram, 40 parts of flame retardant, 5 parts of cross-linking agent, 10 parts of coupling agent and 0.1 part of catalyst. Wherein the flame retardant comprises 15 parts of aluminum hydroxide, 10 parts of magnesium hydroxide, 5 parts of zinc borate and 10 parts of hydrotalcite; the cross-linking agent is methyl tributyl ketoxime silane; the coupling agent comprises 10 parts of gamma-aminopropyltriethoxysilane, 5 parts of gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane and 10 parts of gamma-aminoethylaminopropyltrimethoxysilane; the catalyst was dibutyltin dilaurate.
The embodiment also provides a preparation method of the electric composite insulator repairing adhesive, which takes the formula as a raw material and comprises the following steps:
(1) the coupling agent is stirred evenly and distilled at the high temperature of 110 ℃ for 1.5 hours, and then cooled to obtain the coupling agent reflux.
(2) Fully mixing the hydroxyl-terminated polydimethylsiloxane, the silane modified polyether prepolymer, the white carbon black and the flame retardant in a kneading machine, and then vacuumizing and mixing for 5 hours at the high temperature of 100 ℃ to obtain the initial mixed rubber.
(3) And (3) passing the primarily mixed glue obtained in the step (2) through a three-roll grinder to obtain uniform base glue.
(4) And (3) cooling the base adhesive obtained in the step (3), transferring the base adhesive into a powerful dispersion machine, adding the cross-linking agent, the coupling agent reflux and the catalyst under high-speed stirring, fully mixing and stirring, and discharging.
Example 2
The embodiment provides an electric power composite insulator repairing adhesive which comprises the following raw materials in parts by weight: 200 parts of hydroxyl-terminated polydimethylsiloxane with the viscosity of 80000mPa.s, 40 parts of silane modified polyether prepolymer with the viscosity of 50000mPa.s and the specific surface area of 100cm230 parts of white carbon black per gram, 280 parts of flame retardant, 30 parts of cross-linking agent, 50 parts of coupling agent and 3 parts of catalyst. Wherein the flame retardant comprises 180 parts of aluminum hydroxide, 35 parts of quartz powder, 40 parts of ammonium polyphosphate, 15 parts of aluminum oxide and 10 parts of zinc borate; the cross-linking agent is 4 parts of methyl tributyl ketoxime silane, 2 parts of tetrabutoxime silane and 0.2 part of methyl triacetone hydroxyimino silane; the coupling agent comprises 35 parts of gamma-aminopropyltriethoxysilane and 15 parts of gamma-aminoethylaminopropyltrimethoxysilane; the catalyst is 3 parts of dibutyltin diacetate.
The embodiment also provides a preparation method of the electric composite insulator repairing adhesive, which takes the formula as a raw material and comprises the following steps:
(1) the coupling agent is stirred evenly and distilled at the high temperature of 130 ℃ for 0.5 hour, and then cooled to obtain the coupling agent reflux.
(2) Fully mixing the hydroxyl-terminated polydimethylsiloxane, the silane modified polyether prepolymer, the white carbon black and the flame retardant in a kneading machine, and then vacuumizing and mixing for 2 hours at the high temperature of 140 ℃ to obtain the initial mixed rubber.
(3) And (3) passing the primarily mixed glue obtained in the step (2) through a three-roll grinder to obtain uniform base glue.
(4) And (3) cooling the base adhesive obtained in the step (3), transferring the base adhesive into a powerful dispersion machine, adding the cross-linking agent, the coupling agent reflux and the catalyst under high-speed stirring, fully mixing and stirring, and discharging.
Example 3
The embodiment provides an electric power composite insulator repairing adhesive which comprises the following raw materials in parts by weight: 80 parts of hydroxyl-terminated polydimethylsiloxane with viscosity of 10000mPa.s, 10 parts of silane modified polyether prepolymer with viscosity of 8000mPa.s and specific surface area of 400cm210 parts of white carbon black per gram, 50 parts of flame retardant, 8 parts of cross-linking agent, 20 parts of coupling agent and 0.2 part of catalyst. Wherein, the flame retardant package40 parts of hydrotalcite, 7 parts of decabromodiphenyl oxide and 3 parts of antimony trioxide; the cross-linking agent is tetrabutyl ketoxime silane; the coupling agent comprises 14 parts of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane and 6 parts of gamma-aminoethyl aminopropyl trimethoxy silane; the catalyst is chelated tin.
The embodiment also provides a preparation method of the electric composite insulator repairing adhesive, which takes the formula as a raw material and comprises the following steps:
(1) the coupling agent is stirred evenly and distilled for 1 hour at the high temperature of 120 ℃ and then cooled to obtain the coupling agent reflux.
(2) Fully mixing the hydroxyl-terminated polydimethylsiloxane, the silane modified polyether prepolymer, the white carbon black and the flame retardant in a kneading machine, and then vacuumizing and mixing for 4 hours at a high temperature of 120 ℃ to obtain the initial mixed rubber.
(3) And (3) passing the primarily mixed glue obtained in the step (2) through a three-roll grinder to obtain uniform base glue.
(4) And (3) cooling the base adhesive obtained in the step (3), transferring the base adhesive into a powerful dispersion machine, adding the cross-linking agent, the coupling agent reflux and the catalyst under high-speed stirring, fully mixing and stirring, and discharging.
Example 4
The embodiment provides an electric power composite insulator repairing adhesive which comprises the following raw materials in parts by weight: 150 parts of hydroxyl-terminated polydimethylsiloxane with viscosity of 20000mPa.s, 30 parts of silane modified polyether prepolymer with viscosity of 20000mPa.s and specific surface area of 200cm220 parts of white carbon black per gram, 100 parts of flame retardant, 15 parts of cross-linking agent, 40 parts of coupling agent and 2 parts of catalyst. Wherein the flame retardant comprises 70 parts of magnesium hydroxide, 25 parts of decabromodiphenyl and 5 parts of antimony trioxide; the cross-linking agent is 12 parts of methyl tributyrinoxime silane and 3 parts of vinyl tributyrinoxime silane; the coupling agent comprises 15 parts of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane and 10 parts of gamma-aminoethyl aminopropyl trimethoxy silane, 5 parts of N- (beta-aminoethyl) -gamma-aminopropyl methyl dimethoxy silane and 10 parts of vinyl tri (2-methoxyethoxy) silane; the catalyst is stannous octoate 1.5 parts and dibutyltin dilaurate 0.5 part.
The embodiment also provides a preparation method of the electric composite insulator repairing adhesive, which takes the formula as a raw material and comprises the following steps:
(1) the coupling agent is stirred evenly and distilled for 1 hour at the high temperature of 120 ℃ and then cooled to obtain the coupling agent reflux.
(2) Fully mixing the hydroxyl-terminated polydimethylsiloxane, the silane modified polyether prepolymer, the white carbon black and the flame retardant in a kneading machine, and then vacuumizing and mixing for 3 hours at a high temperature of 120 ℃ to obtain the initial mixed rubber.
(3) And (3) passing the primarily mixed glue obtained in the step (2) through a three-roll grinder to obtain uniform base glue.
(4) And (3) cooling the base adhesive obtained in the step (3), transferring the base adhesive into a powerful dispersion machine, adding the cross-linking agent, the coupling agent reflux and the catalyst under high-speed stirring, fully mixing and stirring, and discharging.
Example 5
The embodiment provides an electric composite insulator repairing adhesive, which comprises the raw materials in the formula in the embodiment 3, and is characterized in that: the adhesive also comprises 1 part of plasticizer and 0.5 part of flatting agent, wherein the plasticizer is alkyl terminated polysiloxane with the viscosity of 500mPa.s, and the flatting agent is polyether modified polysiloxane.
The embodiment also provides a preparation method of the electric composite insulator repairing adhesive, which takes the formula as a raw material and comprises the following steps:
(1) the coupling agent is stirred evenly and distilled for 1 hour at the high temperature of 120 ℃ and then cooled to obtain the coupling agent reflux.
(2) Fully mixing the hydroxyl-terminated polydimethylsiloxane, the silane modified polyether prepolymer, the white carbon black, the flame retardant, the plasticizer and the flatting agent in a kneading machine, and then vacuumizing and mixing for 3 hours at a high temperature of 120 ℃ to obtain the initial mixed rubber.
(3) And (3) passing the primarily mixed glue obtained in the step (2) through a three-roll grinder to obtain uniform base glue.
(4) And (3) cooling the base adhesive obtained in the step (3), transferring the base adhesive into a powerful dispersion machine, adding the cross-linking agent, the coupling agent reflux and the catalyst under high-speed stirring, fully mixing and stirring, and discharging.
Example 6
The embodiment provides an electric composite insulator repairing adhesive, which comprises the raw materials in the formula in the embodiment 4, and is characterized in that: the adhesive also comprises 20 parts of a plasticizer and 5 parts of a leveling agent, wherein the plasticizer is alkyl terminated polysiloxane with the viscosity of 500000mPa.s, and the leveling agent is polyether modified polysiloxane.
The embodiment also provides a preparation method of the electric composite insulator repairing glue, which takes the formula as the raw material, and the specific steps are the same as those in the embodiment 5.
Example 7
The embodiment provides an electric composite insulator repairing adhesive, which comprises the raw materials in the formula in the embodiment 3, and is characterized in that: the adhesive also comprises 2 parts of a plasticizer and 1 part of a flatting agent, wherein the plasticizer is alkyl terminated polysiloxane with the viscosity of 5000mPa.s, and the flatting agent is polyether modified polysiloxane.
The embodiment also provides a preparation method of the electric composite insulator repairing glue, which takes the formula as the raw material, and the specific steps are the same as those in the embodiment 5.
Example 8
The embodiment provides an electric composite insulator repairing adhesive, which comprises the raw materials in the formula in the embodiment 4, and is characterized in that: the paint also comprises 10 parts of a plasticizer and 5 parts of a flatting agent, wherein the plasticizer is alkyl terminated polysiloxane with the viscosity of 50000mPa.s, and the flatting agent is polyether modified polysiloxane.
The embodiment also provides a preparation method of the electric composite insulator repairing glue, which takes the formula as the raw material, and the specific steps are the same as those in the embodiment 5.
Example 9
The embodiment provides an electric composite insulator repairing adhesive, which comprises the raw materials in the formula in the embodiment 8, and is characterized in that: also comprises 0.2 part of ultraviolet absorbent (benzotriazole) and 1 part of iron oxide red.
The embodiment also provides a preparation method of the electric composite insulator repairing adhesive, which takes the formula as a raw material and comprises the following steps:
(1) the coupling agent is stirred evenly and distilled for 1 hour at the high temperature of 120 ℃ and then cooled to obtain the coupling agent reflux.
(2) Fully mixing hydroxyl-terminated polydimethylsiloxane, silane modified polyether prepolymer, white carbon black, flame retardant, plasticizer, leveling agent, ultraviolet absorbent and iron oxide red in a kneader, and then vacuumizing and mixing for 4 hours at the high temperature of 120 ℃ to obtain the initial mixed rubber.
(3) And (3) passing the primarily mixed glue obtained in the step (2) through a three-roll grinder to obtain uniform base glue.
(4) And (3) cooling the base adhesive obtained in the step (3), transferring the base adhesive into a powerful dispersion machine, adding the cross-linking agent, the coupling agent reflux and the catalyst under high-speed stirring, fully mixing and stirring, and discharging.
Example 10
The embodiment provides an electric composite insulator repairing adhesive, which comprises the raw materials in the formula in the embodiment 8, and is characterized in that: also comprises 2 parts of ultraviolet absorbent (benzotriazol) and 8 parts of titanium dioxide.
The embodiment also provides a preparation method of the electric composite insulator repairing glue, which takes the formula as the raw material, and the specific steps are the same as those in the embodiment 9.
Example 11
This embodiment provides an electric composite insulator repairing adhesive, which has the same raw material formula as that in embodiment 4.
The embodiment also provides a preparation method of the electric composite insulator repairing adhesive, which takes the formula as a raw material and comprises the following steps:
the components except the cross-linking agent, the coupling agent and the catalyst in the formula are mixed at normal temperature, rolled, added with the cross-linking agent, the coupling agent and the catalyst, stirred for 2 hours, filled and discharged.
Example 12
This embodiment provides an electric composite insulator repairing adhesive, which has the same raw material formula as that in embodiment 5.
The embodiment also provides a preparation method of the electric composite insulator repairing adhesive, which takes the formula as a raw material and comprises the following steps:
mixing the components except the cross-linking agent, the coupling agent and the catalyst in the formula at 120 ℃ under normal pressure for 7h, cooling to room temperature, adding the cross-linking agent, the coupling agent and the catalyst, stirring for 1 h, discharging and filling.
Comparative example 1
The comparative example provides a repair adhesive, which has a raw material formula substantially the same as that of example 8, except that: the hydroxyl-terminated polydimethylsiloxane in the formula is replaced by polyphenyl methyl siloxane with the same viscosity.
The comparative example also provides a preparation method of the repair adhesive, and the specific steps refer to example 8.
Comparative example 2
The comparative example provides a repair adhesive, which has a raw material formula substantially the same as that of example 8, except that: the hydroxyl-terminated polydimethylsiloxane in the formula is replaced by polyurethane with the same viscosity.
The comparative example also provides a preparation method of the repair adhesive, and the specific steps refer to example 8.
Comparative example 3
The comparative example provides a repair adhesive, which has a raw material formula substantially the same as that of example 8, except that: the hydroxyl-terminated polydimethylsiloxane in the formula is replaced by epoxy resin with the same viscosity.
The comparative example also provides a preparation method of the repair adhesive, and the specific steps refer to example 8.
Comparative example 4
The comparative example provides a repair adhesive, which has a raw material formula substantially the same as that of example 8, except that: does not comprise silane modified polyether prepolymer, and replaces the silane modified polyether prepolymer with the same amount of hydroxyl-terminated polydimethylsiloxane.
The method specifically comprises the following steps: 180 parts of hydroxyl-terminated polydimethylsiloxane with viscosity of 20000mPa.s and specific surface area of 200cm220 parts of white carbon black per gram, 100 parts of flame retardant, 15 parts of cross-linking agent, 40 parts of coupling agent, 2 parts of catalyst, 10 parts of plasticizer and 5 parts of flatting agent. Wherein the flame retardant comprises 70 parts of magnesium hydroxide, 25 parts of decabromodiphenyl and 5 parts of antimony trioxide; the cross-linking agent is 12 parts of methyl tributyrinoxime silane and 3 parts of vinyl tributyrinoxime silane; the coupling agent comprises gamma- (2, 3-epoxypropoxy)15 parts of propyl trimethoxy silane, 10 parts of gamma-aminoethyl aminopropyltrimethoxy silane, 5 parts of N- (beta-aminoethyl) -gamma-aminopropylmethyldimethoxy silane and 10 parts of vinyl tri (2-methoxyethoxy) silane; the catalyst is 1.5 parts of stannous octoate and 0.5 part of dibutyltin dilaurate; the plasticizer is an alkyl terminated polysiloxane with the viscosity of 3000 mPa.s; the leveling agent is polyether modified polysiloxane.
The comparative example also provides a preparation method of the repair adhesive, which takes the formula as a raw material, and the specific steps refer to example 8.
Comparative example 5
The comparative example provides a repair adhesive, which has a raw material formula substantially the same as that of example 8, except that: the coupling agent comprises 20 parts of gamma-methacryloxypropyltrimethoxysilane and 20 parts of isopropyl triisostearate.
The comparative example also provides a preparation method of the repair adhesive, which takes the formula as a raw material, and the specific steps refer to example 8.
Test example 1
The repair pastes obtained in examples 1 to 12 and comparative examples 1 to 5 were tested for weather resistance, adhesive strength and low-temperature curing rate, and the results are shown in table 1.
The test method comprises the following steps: (1) weather resistance: refer to the national standard GB/T19519-. (2) Bonding strength: referring to GBT 14683-2017 silicone and modified silicone building sealant 6, the test method is carried out, wherein one surface of the bonding piece is made of a silicone rubber material, and the other surface of the bonding piece is made of glass. (3) Low-temperature curing rate: controlling the test environment temperature to be-10 ℃, and performing the test according to GB/T13477.5-2002; (4) flame retardant property: reference is made to GB/T13488 rubber combustion performance measurement-vertical combustion method.
Table 1 repair adhesive performance test results
Figure BDA0002018368980000181
Figure BDA0002018368980000191
In summary, the electric composite insulator repair adhesive provided by the invention uses hydroxyl-terminated polydimethylsiloxane, silane modified polyether prepolymer, white carbon black and flame retardant as main raw materials, and is matched with crosslinking agent, coupling agent and catalyst, so that the repair adhesive has the following advantages:
(1) the coating has good weather resistance and is suitable for outdoor use; (2) the material has good compatibility with the material of the composite insulator body, and the cured material has the same hardness and elasticity with the material of the body, so that the phenomenon of stress or field intensity concentration is not easy to cause; (3) the overall adhesion of the repair adhesive is strong, and the curing rate is high at low temperature.
The invention also provides a preparation method of the electric composite insulator repairing adhesive, the formula of the electric composite insulator repairing adhesive is used as a raw material, the method is simple and easy to implement, the prepared adhesive has good weather resistance and good cohesiveness, can be quickly cured at a low temperature, and has good compatibility with a composite insulator body material.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims (11)

1. The electric composite insulator repairing glue is characterized by comprising, by weight, 80-200 parts of polysiloxane, 5-40 parts of silane modified polyether prepolymer, 2-30 parts of white carbon black, 40-280 parts of flame retardant, 5-30 parts of cross-linking agent, 10-50 parts of coupling agent and 0.1-3 parts of catalyst;
the polysiloxane is hydroxyl-terminated polydimethylsiloxane; the hydroxyl-terminated polydimethylsiloxane is selected from one or more adhesives with the viscosity of 5000-; the viscosity of the silane modified polyether prepolymer is 1000-50000 mPa.s;
the coupling agent is selected from one or more of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, vinyl tri (2-methoxyethoxy) silane, gamma-aminopropyl triethoxy silane and N- (beta-aminoethyl) -gamma-aminopropyl methyl dimethoxy silane;
the preparation process of the electric composite insulator repairing adhesive comprises the following steps: heating and refluxing the coupling agent, and then cooling to obtain a coupling agent reflux object; mixing the polysiloxane, the silane modified polyether prepolymer, the white carbon black and the flame retardant, and then mixing the mixture for 2-5h at the temperature of 100-140 ℃ to obtain a primary mixed rubber; grinding the primarily mixed glue to obtain base glue, and then mixing the base glue, the cross-linking agent, the coupling agent reflux and the catalyst; the heating and refluxing process of the coupling agent is to reflux for 0.5-1.5h under the temperature condition of 110-130 ℃.
2. The electric power composite insulator repairing glue according to claim 1, wherein raw materials comprise 80-150 parts of hydroxyl-terminated polydimethylsiloxane, 10-30 parts of silane modified polyether prepolymer, 5-20 parts of white carbon black, 50-200 parts of flame retardant, 8-15 parts of cross-linking agent, 20-40 parts of coupling agent and 0.2-2 parts of catalyst.
3. The electric composite insulator repair glue according to claim 1 or 2, wherein the raw materials of the electric composite insulator repair glue further comprise 0.2-2 parts of an ultraviolet absorber, 1-20 parts of a plasticizer and 0.5-5 parts of a leveling agent.
4. The electric composite insulator repair glue according to claim 3, wherein the ultraviolet absorber is 0.5-1.5 parts, the plasticizer is 2-8 parts, and the leveling agent is 1-3 parts.
5. The electric composite insulator repair glue according to claim 3, wherein the electric composite insulator repair glue further comprises 1-8 parts of pigment, and the pigment is iron oxide red and/or titanium dioxide.
6. The electric power composite insulator repair glue according to claim 3, wherein the ultraviolet absorber is a benzotriazole compound, and the leveling agent is polyether-modified polysiloxane.
7. The electric composite insulator repair glue of claim 3, wherein the plasticizer is selected from any one or more of an alcohol plasticizer, an ester plasticizer, and an alkyl terminated polysiloxane.
8. The electric composite insulator repair glue of claim 7, wherein the plasticizer is an alkyl terminated polysiloxane; the viscosity of the alkyl-terminated polysiloxane was 500-500000 mPa.s.
9. The electric composite insulator repair glue according to claim 1, wherein the flame retardant is selected from one or more of aluminum hydroxide, magnesium hydroxide, quartz powder, aluminum oxide, zinc borate, decabromodiphenyl oxide, ammonium polyphosphate, hydrotalcite and antimony trioxide.
10. The power composite insulator repair paste of claim 1 wherein the catalyst is selected from one or more of dibutyltin diacetate, dibutyltin dilaurate, tin chelates, and stannous octoate.
11. The electric composite insulator repair paste of claim 1 wherein the cross-linking agent is selected from one or more of methyl tributyrinoxime silane, vinyl tributyrinoxime silane, tetrabutoximino silane, and methyl tripropionoximinosilane.
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