CN110819113A - Bare conductor heat-conducting insulating coating material and preparation method thereof - Google Patents
Bare conductor heat-conducting insulating coating material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a bare conductor heat-conducting insulating coating material and a preparation method thereof, wherein the bare conductor heat-conducting insulating coating material comprises the following components in parts by weight: 50-200 parts of a main film forming material, 5-20 parts of a reinforcing material, 20-100 parts of a heat conducting filler, 20-80 parts of a flame retardant, 0-10 parts of a pigment, 2-30 parts of a curing agent, 2-25 parts of an adhesion promoter and 0.01-3 parts of a catalyst. The preparation process comprises the following steps: firstly, fully mixing a main film forming material, a reinforcing filler, a heat-conducting filler, a flame retardant and a pigment in a vacuumizing manner to obtain a primary mixed rubber; grinding the primarily mixed rubber by a roller to prepare base rubber; cooling the base rubber, adding the curing agent, the adhesion promoter and the catalyst under high-speed stirring, fully mixing and stirring, and discharging. The bare conductor heat-conducting insulating coating material can transform a bare conductor into an insulated conductor, so that the circuit is completely insulated; the curing agent can be rapidly cured in an outdoor environment, does not need heating or baking, can be constructed in an online outdoor manner, greatly reduces the construction cost, shortens the construction time and saves manpower and material resources.
Description
Technical Field
The invention relates to a bare conductor heat-conducting insulating coating material and a preparation method thereof, belonging to the technical field of electric power external insulation protection.
Background
The power transmission line has wide range of members and large population in China, so the power transmission line has wide distribution, long length and complex line environment, and the safe and stable operation of the power transmission line directly influences the reliability of a power supply system. The power is mainly transmitted by bare conductors in an overhead line mode, and particularly, the bare conductors of the distribution network are low in height and are easy to contact trees, buildings and the like to form short circuits. Along with the rapid development of a power distribution network, the scale is gradually enlarged, trees are planted in a power supply area continuously, the influence of various factors such as increasingly severe environment corrosion and bird damage is inevitable to occur in operation, faults such as damage caused by external force, interphase short circuit, disconnection and the like are more and more frequent, the production power consumption of enterprises and the life power consumption of residents are directly influenced, and the reliability of the power distribution network faces new difficulty.
The insulation transformation of the overhead line of the power distribution network is a problem which is urgently needed to be solved at present. At present, the insulation of the cable is basically that the cable is subjected to insulation coating before leaving a factory, and one or more layers of polyethylene or polyvinyl chloride insulation layers are coated outside the aluminum stranded wire or the copper stranded wire; however, for the overhead cable in use, only the insulated conductor can be replaced for insulation, so that not only a new tower needs to be erected, but also a long power failure time is needed, the engineering quantity is large, the investment cost is high, and the construction is complex.
Chinese patent No. ZL 201210078483.8 discloses a halogen-free flame retardant resin composition comprising 35 to 70 mass% of polypropylene having a melting peak temperature of 160 ℃ or higher, 25 to 60 mass% of an ethylene- α -olefin copolymer having a melting peak temperature of 90 ℃ or lower, 5 to 20 mass% of an ethylene-based copolymer modified with maleic anhydride, and 5 to 20 mass% of a metal hydrate, and an insulated wire using the same, which is suitable for use as an insulated wire in which appearance defects are effectively prevented from occurring during crimping even when the distance between the terminal of a connector and the crimping punch of a crimping machine is smaller than that of the conventional art, and which can be applied to various types of crimping connectors and conditions of crimping process.
Moreover, the existing insulation composition capable of being coated on site is basically a coating, and is generally coated in a spraying or brushing way, but the thickness of the coating which can be coated once is only 0-0.1 mm, so that a bare wire is easy to appear, the coating needs to be repeated for multiple times, on one hand, the construction time is prolonged, on the other hand, the bare wire is easy to appear after multiple coating, and the safety is difficult to ensure; in addition, the coating needs to be added with an organic solvent as a diluent, and the organic solvent is volatile and pollutes the environment.
Disclosure of Invention
The purpose of the invention is as follows: the invention provides a bare conductor heat-conducting insulating coating material and a preparation method of the bare conductor heat-conducting insulating coating material, aiming at the problems that overhead bare conductors in the prior art have frequent faults and poor circuit transmission safety, and the existing insulation transformation has complex transformation process, cannot be constructed on line, pollutes the environment and the like.
The technical scheme is as follows: the invention relates to a bare conductor heat-conducting insulating coating material which comprises the following components in parts by weight: 50-200 parts of a main film forming material, 5-20 parts of a reinforcing material, 20-100 parts of a heat conducting filler, 20-80 parts of a flame retardant, 0-10 parts of a pigment, 2-30 parts of a curing agent, 2-25 parts of an adhesion promoter and 0.01-3 parts of a catalyst.
Preferably, the heat-conducting insulating coating comprises the following components in parts by weight: 80-120 parts of a main film forming material, 6-12 parts of a reinforcing material, 50-100 parts of a heat conducting filler, 30-60 parts of a flame retardant, 0-10 parts of a pigment, 6-20 parts of a curing agent, 2-15 parts of an adhesion promoter and 0.01-1 part of a catalyst.
Among them, the main film-forming material is preferably one or two or more kinds of gums having a viscosity of 5000cs to 1000000c, and more preferably at least one kind of hydroxyl-terminated dimethylpolysiloxane, hydroxyl-terminated methylethylpolysiloxane, hydroxyl-terminated methylphenylpolysiloxane, and hydroxyl-terminated methylvinylpolysiloxane having a viscosity of 5000cs to 1000000 c.
Preferably, the reinforcing material is at least one of precipitated silica, fumed silica, fine silica powder, silicone resin, and the like having a particle size of 50 μm to 5 nm. The heat conductive filler can be one or more of aluminum oxide, aluminum nitride, zinc oxide, magnesium oxide, boron nitride and silicon carbide. The flame retardant can be at least two of aluminum hydroxide, magnesium hydroxide, melamine, ammonium polyphosphate, pentabromoethyl benzene, decabromodiphenyl ether, zinc borate, antimony trioxide and the like. The pigment can be one of superfine carbon black, iron oxide red and titanium dioxide.
The curing agent can be at least one of methyl triethoxysilane, vinyl triethoxysilane, methyl tributyrinoxime silane, methyl triacetoneoxime silane, vinyl tributyrinoxime silane, tetrabutoximino silane, and phenyl triethoxysilane; the catalyst can be at least one of dibutyltin diacetate, dibutyltin dilaurate, stannous octoate and titanate; the adhesion promoter can be at least one of gamma-aminopropyltriethoxysilane, gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane and gamma-aminoethylaminopropyltrimethoxysilane.
The invention discloses a preparation method of a bare conductor heat-conducting insulating coating material, which comprises the following steps:
(1) heating and fully mixing the main film forming material, the reinforcing filler, the heat-conducting filler, the flame retardant and the pigment under the vacuum condition of less than-0.09 Mpa to obtain a primary mixed rubber;
(2) cooling the primary mixed glue obtained in the step (1) to room temperature, and grinding the primary mixed glue by a roller to obtain uniform base glue;
(3) strongly dispersing the base adhesive obtained in the step (2), adding a curing agent, an adhesion promoter and a catalyst under vacuum stirring, keeping the vacuum below-0.09 Mpa, fully mixing and stirring, and discharging. Preferably, the stirring speed is 20-60 rpm.
Preferably, in the step (1), the mixing temperature under vacuum condition is 120-150 ℃, and the mixing time is 3-5 hours.
Has the advantages that: compared with the prior art, the invention has the advantages that: (1) according to the bare conductor heat-conducting insulating coating material, a bare conductor can be transformed into an insulated conductor, so that the circuit is completely insulated, and the safety of electric energy transmission is improved; (2) the insulating coating material can be rapidly cured in an outdoor environment, heating or baking and other steps are not needed, the insulating coating material can be coated on an overhead bare conductor in an online outdoor construction mode, insulation transformation of the bare conductor of a power distribution network is achieved, shutdown and power failure are not needed, power failure time is greatly reduced, construction cost of insulation transformation of an overhead line is greatly reduced, construction time is shortened, transformation operation efficiency is improved, and manpower and material resources are saved; (3) compared with the existing insulating composition or coating, the insulating coating does not need to be added with an organic solvent, and is safer and more environment-friendly; moreover, one of the coating layers can be coated to a thickness of 2-5 mm, can completely cover the bare conductor, and is high in safety; (4) the bare conductor heat-conducting insulating coating material disclosed by the invention has multiple performances of excellent electrical insulation, heat conductivity, flame retardance, excellent ultraviolet resistance, good wear resistance, heat conductivity, water and air permeation resistance and the like, can meet the external insulation requirement of a distribution network line, is excellent in weather resistance, is particularly suitable for outdoor use, is particularly suitable for lines erected by bare conductors in areas with various trees, metal dust, high pollution, salt fog and dense population, can greatly delay the corrosion of atmospheric pollution, salt fog and the like on the bare conductors, prolongs the service life of the lines, and ensures the safe and stable operation of the lines.
Detailed Description
The technical solution of the present invention is further explained below.
According to the insulation protection design of the bare conductor heat-conducting insulation coating material for the overhead bare conductor, the bare conductor can be transformed into an insulated conductor, so that the circuit is completely insulated, and the safety of electric energy transmission is improved; the coating robot can be used for online outdoor rapid construction through the coating robot, can be cured at room temperature, does not need heating or baking and other steps, and is simple and convenient to operate, high in efficiency and reliable in performance. In addition, the insulating coating material has multiple performances of excellent electrical insulation, thermal conductivity, flame retardance, ultraviolet resistance and the like, and can meet the requirement of external insulation of distribution network lines.
Example 1
A bare conductor heat-conducting insulating coating material comprises the following components in parts by weight:
100 parts of hydroxyl-terminated methyl ethyl polysiloxane with the viscosity of 5000mPa.s, 5 parts of white carbon black with the particle size of 20 micrometers, 19 parts of aluminum hydroxide, 1 part of zinc borate, 70 parts of aluminum oxide, 30 parts of aluminum nitride, 11 parts of methyl tributyl ketoxime silane, 25 parts of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane and 0.1 part of dibutyltin dilaurate.
The preparation process comprises the following steps:
(1) premixing base rubber: putting the solid mixture of hydroxyl-terminated methyl ethyl polysiloxane, white carbon black, aluminum hydroxide, zinc borate, aluminum oxide and aluminum nitride in a kneader, heating to 120 ℃, vacuumizing to-0.094 Mpa, and fully mixing for 3 hours at a stirring speed of 20 r/min to obtain a primary mixed glue;
(2) passing the primarily mixed glue obtained in the step (1) through a three-roll grinder to prepare uniform base glue;
(3) and (3) cooling the base adhesive obtained in the step (2), transferring the base adhesive into a powerful dispersion machine, adding methyl tributyl ketoxime silane, gamma- (2, 3-epoxy propoxy) propyl trimethoxy silane and dibutyltin dilaurate under vacuum stirring, keeping the vacuum degree at-0.094 Mpa, fully mixing and stirring, and discharging.
Example 2
A bare conductor heat-conducting insulating coating material comprises the following components in parts by weight:
150 parts of terminal hydroxyl methyl phenyl polysiloxane with the viscosity of 50000 mPas, 50 parts of terminal hydroxyl methyl phenyl polysiloxane with the viscosity of 10000 mPas, 20 parts of white carbon black with the particle size of 1 mu m, 5 parts of zinc oxide, 10 parts of magnesium oxide, 5 parts of boron nitride, 40 parts of aluminum hydroxide, 20 parts of magnesium hydroxide, 15 parts of pentabromoethyl benzene, 5 parts of antimonous oxide, 8 parts of carbon black, 23 parts of methyl tributyl ketoxime silane, 2 parts of methyl triethoxysilane, 5 parts of vinyl tributoxy ketoxime silane, 2 parts of gamma-aminopropyl triethoxysilane and 3 parts of stannous octoate.
The preparation process comprises the following steps:
(1) premixing base rubber: putting a solid mixture of hydroxyl-terminated methyl phenyl polysiloxane, white carbon black, zinc oxide, magnesium oxide, boron nitride, aluminum hydroxide, magnesium hydroxide, pentabromoethyl benzene, antimony trioxide and carbon black in a kneader, heating to 150 ℃, vacuumizing to-0.098 Mpa, and fully mixing for 5 hours at a stirring speed of 60 r/min to obtain a primary mixed glue;
(2) passing the primarily mixed glue obtained in the step (1) through a three-roll grinder to prepare uniform base glue;
(3) and (3) cooling the base adhesive obtained in the step (2), transferring the base adhesive into a powerful dispersion machine, adding methyl tributyl ketoxime silane, methyl triethoxysilane, vinyl tributyloxime silane, gamma-aminopropyl triethoxysilane and stannous octoate under vacuum stirring, keeping the vacuum degree at-0.098 Mpa, fully mixing and stirring, and discharging.
Example 3
A bare conductor heat-conducting insulating coating material comprises the following components in parts by weight:
30 parts of hydroxyl-terminated dimethylpolysiloxane with the viscosity of 1000000 mPas, 20 parts of hydroxyl-terminated dimethylpolysiloxane with the viscosity of 8000 mPas, 8 parts of white carbon black with the particle size of 5nm, 10 parts of silicon carbide, 20 parts of magnesium oxide, 10 parts of melamine, 10 parts of ammonium polyphosphate, 10 parts of decabromodiphenyl ether, 1 part of antimony trioxide, 5 parts of iron oxide red, 4 parts of methyl tributyrinoxime silane, 2 parts of tetrabutyl oxime silane, 0.2 part of methyl tripropionoxime silane, 1 part of gamma-aminopropyltriethoxysilane, 11 parts of gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, 1 part of gamma-aminoethylaminopropyltrimethoxysilane and 0.3 part of dibutyltin dilaurate.
The preparation process comprises the following steps:
(1) premixing base rubber: putting a solid mixture of hydroxyl-terminated dimethyl polysiloxane, white carbon black, silicon carbide, magnesium oxide, melamine, ammonium polyphosphate, decabromodiphenyl ether, antimony trioxide and iron oxide red into a kneader, heating to 120 ℃, vacuumizing to-0.096 Mpa, and fully stirring and mixing for 4 hours at the speed of 30 revolutions per minute to obtain a primary mixed rubber;
(2) passing the primarily mixed glue obtained in the step (1) through a three-roll grinder to prepare uniform base glue;
(3) and (3) cooling the base adhesive obtained in the step (2), transferring the base adhesive into a powerful dispersion machine, adding methyl tributyrinoxime silane, tetrabutoximino silane, methyl tripropionoximino silane, gamma-aminopropyltriethoxysilane, gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane, gamma-aminoethyl aminopropyltrimethoxysilane and dibutyltin dilaurate under vacuum stirring, keeping the vacuum degree at-0.096 Mpa, fully mixing and stirring, and discharging.
Example 4
A bare conductor heat-conducting insulating coating material comprises the following components in parts by weight:
60 parts of hydroxyl-terminated dimethyl polysiloxane with the viscosity of 100000cs, 20 parts of hydroxyl-terminated methyl vinyl polysiloxane, 6 parts of white carbon black with the particle size of 5 mu m, 25 parts of zinc oxide, 25 parts of magnesium oxide, 28 parts of aluminum hydroxide, 2 parts of zinc borate, 6 parts of methyl tributyl ketoxime silane, 2 parts of gamma-aminopropyl triethoxysilane and 0.01 part of dibutyltin dilaurate.
The preparation process comprises the following steps:
(1) premixing base rubber: putting a solid mixture of hydroxyl-terminated dimethyl polysiloxane, hydroxyl-terminated methyl vinyl polysiloxane, white carbon black, aluminum hydroxide, zinc oxide, magnesium oxide and zinc borate into a kneader, heating to 120 ℃, vacuumizing to-0.094 Mpa, and fully mixing for 3 hours at a stirring speed of 30 revolutions per minute to obtain a primary mixed rubber;
(2) passing the primarily mixed glue obtained in the step (1) through a three-roll grinder to prepare uniform base glue;
(3) and (3) cooling the base adhesive obtained in the step (2), transferring the base adhesive into a powerful dispersion machine, adding methyl tributyl ketoxime silane, gamma-aminopropyl triethoxysilane and dibutyltin dilaurate under vacuum stirring, keeping the vacuum degree at-0.094 Mpa, fully mixing and stirring, and discharging.
Example 5
A bare conductor heat-conducting insulating coating material comprises the following components in parts by weight:
120 parts of hydroxyl-terminated methyl ethyl polysiloxane with the viscosity of 10000mPa.s, 12 parts of white carbon black with the particle size of 20nm, 55 parts of aluminum hydroxide, 4 parts of decabromodiphenyl ether, 1 part of antimony trioxide, 70 parts of aluminum oxide, 30 parts of boron nitride, 10 parts of titanium dioxide, 20 parts of methyl tributyl ketoxime silane, 15 parts of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane and 1 part of stannous octoate.
The preparation process comprises the following steps:
(1) premixing base rubber: putting a solid mixture of hydroxyl-terminated methyl ethyl polysiloxane, white carbon black, aluminum hydroxide, decabromodiphenyl ether, antimony trioxide, alumina, boron nitride and titanium dioxide into a kneader, heating to 130 ℃, vacuumizing to-0.094 Mpa, stirring at 40 rpm, and fully mixing for 3 hours to obtain a primary mixed gel;
(2) passing the primarily mixed glue obtained in the step (1) through a three-roll grinder to prepare uniform base glue;
(3) and (3) cooling the base adhesive obtained in the step (2), transferring the base adhesive into a powerful dispersion machine, adding methyl tributyl ketoxime silane, gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane and stannous octoate under vacuum stirring, keeping the vacuum degree at-0.094 Mpa, fully mixing and stirring, and discharging.
Example 6
A bare conductor heat-conducting insulating coating material comprises the following components in parts by weight:
100 parts of hydroxyl-terminated dimethyl polysiloxane with the viscosity of 20000mPa.s, 8 parts of white carbon black with the particle size of 5nm, 50 parts of aluminum hydroxide, 1 part of zinc borate, 100 parts of aluminum oxide, 7 parts of methyl tributyl ketoxime silane, 5 parts of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane and 0.03 part of dibutyltin dilaurate.
The preparation process comprises the following steps:
(1) premixing base rubber: putting the solid mixture of hydroxyl-terminated dimethyl polysiloxane, white carbon black, aluminum hydroxide, zinc borate and aluminum oxide into a kneader, heating to 120 ℃, vacuumizing to-0.094 Mpa, and fully mixing for 3 hours at a stirring speed of 30 revolutions per minute to obtain a primary mixed glue;
(2) passing the primarily mixed glue obtained in the step (1) through a three-roll grinder to prepare uniform base glue;
(3) and (3) cooling the base adhesive obtained in the step (2), transferring the base adhesive into a powerful dispersion machine, adding methyl tributyl ketoxime silane, gamma- (2, 3-epoxy propoxy) propyl trimethoxy silane and dibutyltin dilaurate under vacuum stirring, keeping the vacuum degree at-0.094 Mpa, fully mixing and stirring, and discharging.
The heat-conducting insulating coating materials prepared in the embodiments 1 to 6 are added into automatic coating equipment respectively, the coating materials are extruded to the surface of a bare wire through the automatic coating equipment, the coating materials are rapidly cured in an outdoor environment, an insulating coating layer is formed on the surface of the bare wire, and the performance of the insulating coating layer formed by the coating materials prepared in each embodiment is tested, as shown in the following table 1.
TABLE 1 service Performance parameters of the thermally conductive insulating coating materials prepared in examples 1 to 6
As can be seen from Table 1, the heat-conducting insulating coating material for the bare conductor prepared by the invention can be rapidly cured at room temperature, so that online construction can be realized, meanwhile, the coating thickness of the coating material for the bare conductor can reach 2-5 mm, the bare conductor can be completely coated, and the safety is high; in addition, the composite material also has excellent insulating property, thermal conductivity and flame retardant property. Moreover, compared with the embodiments 1 to 3, the bare conductor heat-conducting insulating coating materials prepared in the embodiments 4 to 6 within the range of optimized raw material parameters have better heat conductivity and flame retardance, and the surface drying time is more suitable for construction; generally, the surface drying time of about 20-30 min is suitable for construction, so that high construction efficiency can be guaranteed, and the problem that construction pipelines are blocked due to the fact that the curing speed is too high is solved.
Claims (10)
1. A bare conductor heat-conducting insulating coating material is characterized by comprising the following components in parts by weight: 50-200 parts of a main film forming material, 5-20 parts of a reinforcing material, 20-100 parts of a heat conducting filler, 20-80 parts of a flame retardant, 0-10 parts of a pigment, 2-30 parts of a curing agent, 2-25 parts of an adhesion promoter and 0.01-3 parts of a catalyst.
2. The bare conductor heat-conducting insulating coating material as claimed in claim 1, which is characterized by comprising the following components in parts by weight: 80-120 parts of a main film forming material, 6-12 parts of a reinforcing material, 50-100 parts of a heat conducting filler, 30-60 parts of a flame retardant, 0-10 parts of a pigment, 6-20 parts of a curing agent, 2-15 parts of an adhesion promoter and 0.01-1 part of a catalyst.
3. The bare conductor heat-conducting insulating coating according to claim 1, wherein the main film forming material is at least one of hydroxyl-terminated dimethyl polysiloxane, hydroxyl-terminated methyl ethyl polysiloxane, hydroxyl-terminated methyl phenyl polysiloxane and hydroxyl-terminated methyl vinyl polysiloxane with a viscosity of 5000-1000000 cs.
4. The bare conductor heat-conducting insulating coating material according to claim 3, wherein the reinforcing material is white carbon black with a particle size of 5 nm-50 μm.
5. The bare conductor heat-conducting insulating coating according to claim 1, wherein the heat-conducting filler is one or more of aluminum oxide, aluminum nitride, zinc oxide, magnesium oxide, boron nitride, and silicon carbide.
6. The bare conductor heat-conducting insulating coating material according to claim 1, wherein the flame retardant is at least two of aluminum hydroxide, magnesium hydroxide, melamine, ammonium polyphosphate, pentabromoethyl benzene, decabromodiphenyl ether, zinc borate and antimony trioxide; the pigment is one of superfine carbon black, iron oxide red and titanium dioxide.
7. The bare conductor heat-conducting insulating coating according to claim 1, wherein the curing agent is at least one of methyltriethoxysilane, vinyltriethoxysilane, methyltributanoxime silane, vinyltributketoxime silane, tetrabutoxime silane, and phenyltriethoxysilane.
8. The bare conductor heat-conducting insulating coating according to claim 1, wherein the catalyst is at least one of dibutyltin diacetate, dibutyltin dilaurate, stannous octoate and titanate; the adhesion promoter is at least one of gamma-aminopropyltriethoxysilane, gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane and gamma-aminoethylaminopropyltrimethoxysilane.
9. The preparation method of the bare conductor heat-conducting insulating coating material according to claim 1, characterized by comprising the following steps:
(1) heating and fully mixing the main film forming material, the reinforcing filler, the heat-conducting filler, the flame retardant and the pigment under the vacuum condition of less than-0.09 Mpa to obtain a primary mixed rubber;
(2) cooling the primary mixed glue obtained in the step (1) to room temperature, and grinding the primary mixed glue by a roller to obtain uniform base glue;
(3) strongly dispersing the base adhesive obtained in the step (2), adding a curing agent, an adhesion promoter and a catalyst under vacuum stirring, keeping the vacuum below-0.09 Mpa, fully mixing and stirring, and discharging.
10. The method for preparing the bare conductor heat-conducting insulating coating material according to claim 9, wherein in the step (1), the mixing temperature is 120-150 ℃ under vacuum condition, and the mixing time is 3-5 hours.
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