CN114216354A - Insulating heat pipe with compact anti-seepage fluororesin coating - Google Patents
Insulating heat pipe with compact anti-seepage fluororesin coating Download PDFInfo
- Publication number
- CN114216354A CN114216354A CN202210163255.4A CN202210163255A CN114216354A CN 114216354 A CN114216354 A CN 114216354A CN 202210163255 A CN202210163255 A CN 202210163255A CN 114216354 A CN114216354 A CN 114216354A
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- China
- Prior art keywords
- epoxy
- pipe
- heat
- heat pipe
- insulating
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- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical class C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D5/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, using the cooling effect of natural or forced evaporation
- F28D5/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, using the cooling effect of natural or forced evaporation in which the evaporating medium flows in a continuous film or trickles freely over the conduits
-
- 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
-
- 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
- C08K3/28—Nitrogen-containing compounds
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C09D127/16—Homopolymers or copolymers of vinylidene fluoride
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D127/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C09D127/18—Homopolymers or copolymers of tetrafluoroethene
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
- C09D129/10—Homopolymers or copolymers of unsaturated ethers
-
- 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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
-
- 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
- C08K3/28—Nitrogen-containing compounds
- C08K2003/282—Binary compounds of nitrogen with 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
- C08K2003/382—Boron-containing compounds and nitrogen
- C08K2003/385—Binary compounds of nitrogen with boron
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2245/00—Coatings; Surface treatments
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to an insulated heat pipe with a compact anti-seepage fluororesin coating. The insulating heat pipe comprises at least one group of heat pipe subunits, each heat pipe subunit comprises an epoxy heat absorption pipe, an epoxy heat dissipation pipe, a heat conduction epoxy heat dissipation fin and an insulating flexible connecting pipe, each heat pipe subunit is made of high-filling ultrahigh heat conduction epoxy resin materials, a compact anti-seepage fluororesin coating is plated on the inner wall and/or the outer wall of the insulating heat pipe, and insulating cooling liquid is filled in the epoxy heat absorption pipe. The invention can select the highly filled epoxy resin material with ultrahigh heat conductivity, the evaporation and condensation cycle of the insulating cooling liquid and the arrangement of the fluororesin coating, which are three-in-one, supplement each other and have no defects, thereby jointly realizing that the invention improves the mechanical strength and the electrical performance of the insulating heat pipe while improving the heat dissipation efficiency, can also prolong the service life of the insulating heat pipe, and is safely and efficiently applied to the field of high-voltage electrical equipment.
Description
Technical Field
The invention belongs to the technical field of insulating heat-conducting heat pipes and impermeable coatings, and particularly relates to an insulating heat pipe with a compact impermeable fluororesin coating.
Background
The heat pipe is a common component in the field of heat conduction and heat dissipation, but the heat pipe technology is very rare in the field of electricians, in particular in the field of high-voltage electrical equipment, and the heat pipe cannot be applied due to the poor insulating property of the heat pipe. However, with the increasing heat dissipation requirements of miniaturized and high-capacity equipment, if the working condition oil temperature of the high-voltage converter transformer reaches 80 ℃, the core winding temperature reaches nearly 100 ℃, forced air cooling cannot meet the requirement of stable working conditions of the equipment, and the application and search of a more efficient heat conduction and heat dissipation mode must be scheduled.
Patent CN103618394A discloses a disc type motor stator using heat pipe windings, each phase of heat pipe windings in the patent is composed of a plurality of coils connected in series or in parallel, each coil is composed of one or more heat pipes, the heat pipes forming the same coil are connected together through the end of the heat pipe, the heat pipe is a hollow pipeline with two closed ends, the interior of the heat pipe is filled with non-conductive cooling liquid, and the outer surface of the heat pipe is subjected to insulation treatment. However, the heat pipe has poor insulation performance, and cannot meet the application requirements of high-voltage electrical appliances, and meanwhile, the heat pipe is not subjected to anti-leakage treatment, so that leakage of cooling liquid is easy to occur, and the service life of the heat pipe is affected.
Therefore, more researches have been focused on adding a hydrophobic anti-seepage coating on the wall of the heat pipe, and patent CN106225531A discloses a preparation method of a non-uniform-wettability high-efficiency phase-change coating and a gravity heat pipe device; comprises a tube body with two sealed ends, and liquid working medium is filled in the tube body; the upper part of the tube body is a condensation section, and the lower part of the tube body is an evaporation section; the inner top wall of the condensation section is a sawtooth structure surface; the inner side wall of the condensation section, the surface of the sawtooth-shaped structure and the inner bottom surface of the evaporation section are covered with non-uniform wettability coatings; the non-uniform wettability coating includes hydrophobic and hydrophilic regions. The uneven wettability coating structure covered on the zigzag structure surface of the condensation section is straight stripes formed by alternate hydrophobic areas and hydrophilic areas; the direction of the straight stripe is vertical to the sawtooth grooves of the sawtooth-shaped structure surface. However, the invention aims to improve the heat dissipation capability of the heat pipe, has poor insulation performance and cannot be applied to high-voltage electrical equipment.
Therefore, it is a problem to be solved by those skilled in the art to design an insulating heat pipe with good heat dissipation capability and excellent insulating property, which is applied to high-voltage electrical equipment and ensures safety, and simultaneously prevents the insulating cooling liquid filled in the heat pipe from seeping and drying up.
Disclosure of Invention
In view of the above-mentioned drawbacks in the prior art, an object of the present invention is to provide an insulating heat pipe for high-voltage equipment and a method for plating a dense impermeable fluororesin coating on the inner wall and/or outer wall of the insulating heat pipe, so as to ensure the safe application in the field of electricians while achieving efficient heat dissipation, and to prolong the service life of the heat pipe.
In order to achieve the purpose, the invention provides the following technical scheme:
an insulated heat pipe for high voltage electrical equipment, the insulated heat pipe comprising at least one set of heat pipe sub-units; the insulating heat pipe is obliquely arranged at the surface heating position of the electrical equipment, is positioned in a high-temperature area of the high-voltage electrical equipment, and has the temperature higher than 70 ℃ and even can be positioned in an ultrahigh-temperature area of the electrical equipment, and has the temperature higher than 120 ℃. The volume resistance of the insulating heat pipe is more than or equal to 1 multiplied by 1013Omega cm, the insulating heat pipe has good insulating capability no matter in a pasting or pre-embedding working mode, and the appearance design of the insulating heat pipe is combined to meet the safety production specification of a power system.
The heat pipe subunit comprises an epoxy heat absorption pipe, an epoxy radiating pipe, a heat conduction epoxy radiating fin and an insulation flexible connecting pipe;
the epoxy heat absorption tubes are positioned below the epoxy radiating tubes, and the tail ends of the epoxy heat absorption tubes and the tail ends of the epoxy radiating tubes are embedded into the heat-conducting epoxy radiating fins;
two ends of the insulating flexible connecting pipe extend into the epoxy heat absorption pipe and the epoxy radiating pipe and are used for communicating the epoxy heat absorption pipe with the epoxy radiating pipe;
the insulating heat pipe is prepared from a high-filling ultrahigh heat-conducting epoxy resin material, wherein the epoxy resin material comprises an epoxy resin base material and heat-conducting powder; the epoxy resin base material is one or two of tetrabromobisphenol A type epoxy resin or hydrogenated bisphenol A type epoxy resin; the heat conducting powder is one or more of boron nitride, aluminum oxide, aluminum nitride and zinc oxide.
The inner wall and/or the outer wall of the insulating heat pipe is/are provided with a compact anti-seepage fluororesin coating; the dielectric strength of the coating is 40-70kV · mm; the insulating heat pipe is at least coated with a layer of fluororesin coating on the inner side and/or the outer side of the pipe wall of the epoxy heat absorption pipe, the epoxy radiating pipe and the insulating flexible connecting pipe, so that the insulating cooling liquid in the insulating heat pipe is prevented from seeping and drying up, and the service life of the insulating heat pipe is effectively prolonged.
And insulating cooling liquid is filled in the epoxy heat absorption pipe, and the insulating cooling liquid comprises fluorine-containing solution and alcohol solution.
Further, the highly filled ultrahigh heat-conducting epoxy resin material is prepared by mixing an epoxy resin base material and heat-conducting powder; the mass percentage ratio of the epoxy resin base material to the heat-conducting powder is 100 (100-165).
Furthermore, the thermal conductivity of the epoxy resin material is more than or equal to 2.5 W.m-1·K-1Volume resistance is not less than 2.2X 1015Ω·cm。
Further, the preparation method of the fluororesin coating comprises the following steps:
a. pretreating the surface of the insulating heat pipe;
b. preparing a coating:
and (3) uniformly coating the fluororesin coating on the wall of the insulating heat pipe, and drying to obtain the compact impermeable fluororesin coating.
Further, the preparation method of the fluororesin coating comprises the following steps:
s1: uniformly mixing a solvent, a fluororesin monomer, a vinyl monomer, an initiator and a dispersing agent according to a ratio to prepare a mixed solution A; solution A is the basic solution for preparing the anti-seepage coating, and fluororesin monomers and vinyl monomers are alternately polymerized under the action of an initiator.
S2: uniformly mixing a solvent, acrylic acid, diallyldodecylamine and an initiator according to a ratio to obtain a mixed solution B; the solution B is a functional solution, wherein both acrylic acid and diallyldodecylamine are functional monomers, the acrylic acid monomer can increase the adhesive force between the fluororesin coating and the heat pipe, and the diallyldodecylamine can increase the hydrophobicity of the coating.
S3: mixing the solution A and the solution B, and heating and stirring;
s5: and after the reaction is finished, performing ultrasonic dispersion for 10-20 minutes at the ultrasonic frequency of 20-50KHz to prepare the fluororesin coating.
Further, the solution A comprises the following components in percentage by mass: solvent: fluoroolefin monomer: vinyl monomer (B): initiator: dispersant = (10-12): (3-5): (3-5): (1.4-2): (0.6-1);
the solution B comprises the following components in percentage by mass: solvent: acrylic acid: diallyldodecylamine: initiator = (10-13): (2-3): (5-7): (0.6-1).
Further, the fluoroolefin monomer is selected from one or more of vinylidene fluoride, tetrafluoroethylene, trifluoropropene and hexafluoropropylene.
The vinyl is one or two of vinyl ethers and vinyl esters; the initiator is selected from one or more of benzoyl peroxide, dibenzoyl peroxide, azobisisobutyronitrile, azobisisovaleronitrile and tert-butyl peroxybenzoate; the solvent is one or more selected from diisobutyl ketone, methyl amyl ketone, isophorone, dimethyl carbonate and methoxybutyl acetate; the dispersant is polyvinyl alcohol.
Further, the fluororesin coating layer has a vapor permeability coefficient k of 1.0X 10 or less-11g/(m.h.Pa); the invention uses the vapor permeability coefficient to represent the anti-seepage function of the material, combines the thickness of the coating, and can use the vapor permeability resistance to measure the anti-seepage function of the coating, and the specific formula is as follows:
wherein the content of the first and second substances,
represents the vapor permeation resistance of the fluororesin coating, and has the unit of (m)2·h·Pa）/g，
Represents a vapor permeability coefficient in the unit of g/(m.h.Pa),
the coating thickness is expressed in m. The thickness of the fluororesin coating is 1-100 mu m, the surface tension is less than or equal to 12mN/m, the hydrophobic angle is more than 150 degrees, and the volume resistance is more than or equal to 4.6 multiplied by 1016Omega cm, surface resistance not less than 1.0X 1017Ω 。
Further, the fluorine-containing solution comprises one or more of decafluoropentane, hexafluorobutene and hydrofluoroether; the alcohol solution is ethylene glycol; the mass percentage ratio of the ethylene glycol to the fluorine-containing solution is 1: (0.5-1.5). The boiling point of the fluorine-containing mixed solution is adjusted by the glycol, so that the working temperature range of the insulating cooling liquid in the heat pipe is 50-120 DEG C
Furthermore, the density of the insulating cooling liquid is 1.3-1.6g/ml, and the volume resistance is more than or equal to 1.0 multiplied by 109Omega cm, and the volume of the filling tube cavity is 30-50%. The volume of the insulating cooling liquid is not more than half of the volume of the tube cavity, so that the insulating cooling liquid is prevented from generating gas after being heated and boiled to cause explosion of the insulating heat tube.
The invention increases the insulating property of the insulating heat pipe by using the highly filled ultrahigh heat conduction epoxy resin as the heat pipe material, and the evaporation vaporization-condensation liquefaction reflux circulation of the insulating condensate effectively improves the heat transfer and dissipation in the strong magnetic and strong electric environment. In conclusion, the selection of the highly filled ultrahigh heat conduction epoxy resin material, the evaporation and condensation cycle of the insulating cooling liquid and the arrangement of the fluororesin coating are three-in-one and complement each other, and all the above are absent, so that the heat dissipation efficiency is improved, the heat dissipation device is safely and efficiently applied to the field of high-voltage electrical equipment, and the service life of the insulating heat pipe can be prolonged.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:
FIG. 1 is a schematic diagram illustrating a heat pipe subunit according to the present invention;
FIG. 2 is a schematic diagram illustrating a heat pipe subunit according to the present invention;
fig. 3 is a schematic view illustrating the application of an insulated heat pipe to a high voltage electrical device according to the present invention.
Description of reference numerals: the heat-absorbing epoxy pipe comprises an epoxy heat-absorbing pipe-1, an epoxy heat-radiating pipe-2, a heat-conducting epoxy heat-radiating fin-3, an insulating flexible connecting pipe-4, insulating cooling liquid-S, a normal temperature area-a, a high temperature area-b and an extra-high temperature area-c.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1-2, in a heat pipe subunit, an epoxy heat absorption pipe 1, an epoxy heat dissipation pipe 2, a heat conduction epoxy heat dissipation fin 3 and an insulation flexible connection pipe 4 are included; the epoxy heat absorption tube 1 is positioned below the epoxy radiating tube 2, and the volume of the tube cavity of the epoxy radiating tube 2 is larger than or equal to that of the tube cavity of the epoxy heat absorption tube 1. The epoxy radiating pipe 2 avoids the insulating cooling liquid S from being heated and boiled to generate a large amount of gas and being heated, expanded and exploded through larger pipe cavity volume and negative pressure in the pipe cavity, the use safety of the insulating heat pipe is ensured, and the negative pressure in the pipe cavity is 1 multiplied by 10-2Pa. The tail ends of the epoxy heat absorption pipe 1 and the epoxy radiating pipe 2 are embedded into the heat-conducting epoxy radiating fins 3. The heat conduction epoxy heat dissipation fins 3 embedded in the epoxy heat absorption tubes 1 rapidly guide heat of electrical equipment into the epoxy heat absorption tubes 1 to enable the insulating cooling liquid S to boil, the heat conduction epoxy heat dissipation fins 3 at the epoxy heat dissipation tubes 2 rapidly absorb the heat in the epoxy heat dissipation tubes 2 through a larger heat dissipation area to achieve heat dissipation, the vaporized insulating cooling liquid S is condensed into liquid again, and the liquid flows back to the epoxy heat absorption tubes 1 from the insulating flexible connecting tubes 4 to achieve evaporation-condensation circulation of the insulating cooling liquid S in the heat tubes.
The epoxy heat absorption tube 1 is filled with insulating cooling liquid S, the insulating cooling liquid S is prepared by mixing one or more of decafluoropentane, hexafluorobutene and hydrofluoroether with ethylene glycol, and the ethylene glycol is used for adjusting the boiling point of the insulating cooling liquid. The content of the insulating cooling liquid S is 30-50% of the volume of the epoxy heat absorption tube 1, and the volume resistance is more than or equal to 1.0 multiplied by 109Omega cm, density of 1.3-1.6g/ml, boiling point of 50-120 deg.C. This application makes the unable hundred per cent boiling of insulating coolant liquid through the selection of insulating coolant liquid kind and the ratio combination of various insulating coolant liquid components, prevents that insulating coolant liquid from being heated and producing gas after the boiling and leading to the explosion of insulating heat pipe.
Specifically, the preparation method of the insulating cooling liquid S comprises the following steps:
the first step is as follows: pouring fluorine-containing solution and glycol in a vacuum stirring vessel according to the mass percentage;
the second step is that: standing the mixed solution for 20-30min after vacuumizing;
the third step: mixing and stirring at 8-12 ℃ by using a paddle stirrer, wherein the stirring speed is 300-550 rpm;
the fourth step: and filling and sealing the stirred liquid.
The shape of the insulating flexible connecting pipe 4 is a linear type or one or more U-shaped end-to-end connection, and the insulating flexible connecting pipe can be straightened or bent according to the heat dissipation requirement or the backflow of the insulating cooling liquid S, and the position of the insulating flexible connecting pipe cannot be lower than the relative height of the epoxy heat absorption pipe 1, so that the backflow of the insulating cooling liquid S is ensured to be normal. The two ends of the heat-absorbing tube are extended into the epoxy heat-absorbing tube 1 and the epoxy radiating tube 2, and the heat-absorbing tube 1 and the epoxy radiating tube 2 are communicated and are used for sealing the epoxy heat-absorbing tube 1 and the epoxy radiating tube 2, so that the insulating cooling liquid S in the heat-absorbing tube is prevented from losing.
As shown in fig. 3, the present invention provides an insulated heat pipe, where a rectangular parallelepiped represents a high-voltage electrical device, and a dotted line divides the device into three regions, where a region is a normal temperature region, b region is a high temperature region, and c region is an extra high temperature region. The insulating heat pipe is obliquely arranged at the surface heating position of the electrical equipment, the included angle between the installation angle and the horizontal plane is 3-177 degrees, so that the backflow of the insulating cooling liquid is guaranteed, the epoxy radiating pipe 2 is located in the normal-temperature area a, the epoxy heat absorbing pipe 1 is located in the high-temperature area b of the high-voltage electrical equipment, the temperature of the area is higher than 70 ℃, and the epoxy heat absorbing pipe 1 can even be located in the ultrahigh-temperature area c of the electrical equipment, and the temperature of the area is higher than 120 ℃. The insulating heat pipe is installed in a pre-embedded mode or a pasting mode; the heat conductivity coefficient of the heat pipe can be more than or equal to 60W/(m.k), and is far more than 1-5W/(m.k) of the normal heat conductivity coefficient of the common heat conduction material.
The insulating heat pipe is made of a high-filling ultrahigh-heat-conductivity epoxy resin material, one or two of tetrabromobisphenol A type epoxy resin or hydrogenated bisphenol A type epoxy resin is mixed with one or more of boron nitride, aluminum oxide, aluminum nitride and zinc oxide, vacuum casting is carried out after vacuum defoaming treatment, segmented heating and curing are carried out, and the insulating heat pipe is prepared after natural cooling, wherein the mass percentage ratio of the epoxy resin base material to the heat-conducting powder is 100 (100-165). The material has excellent mechanical property and electrical property, and provides an important foundation for the application of the insulating heat pipe prepared by the invention in the field of high-voltage electrical equipment.
The inner wall and/or the outer wall of the insulated heat pipe are/is coated with a compact anti-seepage fluororesin coating. The fluororesin layer coating was prepared by the following method.
First, a fluororesin coating material is prepared.
In the first step, solution a is prepared. The weight percentage ratio is (10-12): (3-5): (3-5): (1.4-2): (0.6-1) uniformly mixing the solvent, the fluoroolefin monomer, the vinyl monomer, the initiator and the dispersant to prepare a solution A; wherein the solvent is selected from one or more of diisobutyl ketone, methyl amyl ketone, isophorone, dimethyl carbonate and methoxybutyl acetate; the fluoroolefin monomer is selected from one or more of vinylidene fluoride, tetrafluoroethylene, trifluoropropene and hexafluoropropylene; the vinyl monomer is one or two of vinyl ethers and vinyl esters; the initiator is selected from one or more of benzoyl peroxide, dibenzoyl peroxide, azobisisobutyronitrile, azobisisovaleronitrile and tert-butyl peroxybenzoate; the dispersant is polyvinyl alcohol.
Second, solution B is prepared. Mixing the following components in percentage by mass (10-13): (2-3)(5-7): (0.6-1) uniformly mixing the solvent, acrylic acid, diallyldodecylamine and the initiator to obtain a solution B; wherein, the selection of the solvent and the initiator is the same as that of the solution A.
Adding the solution A into a three-mouth reaction bottle, wherein the three-mouth reaction bottle is respectively connected with a reflux condenser tube, a dropping funnel and a constant-temperature heating stirrer, adding the solution B into the dropping funnel, heating to 70-85 ℃, starting the constant-temperature heating stirrer, and slowly dropping the solution B in the dropping funnel into the three-mouth reaction bottle within 1.5-2 h;
fourthly, reacting for 1 to 2 hours after the dropwise adding is finished, and performing ultrasonic dispersion for 10 to 20 minutes at the ultrasonic frequency of 20 to 50KHz to prepare the fluororesin coating.
Secondly, the surface of the insulating heat pipe is pretreated. Phosphoric acid and hydrogen peroxide are mixed according to the mass percentage of 1: (0.8-1.2) preparing a cleaning solution, soaking the insulated heat pipe in the cleaning solution for 15-25min, taking out, checking that the surface is free of pollution, ultrasonically cleaning the insulated heat pipe by using deionized water for 10-20min, putting the insulated heat pipe into a drying box after the ultrasonic cleaning is finished, drying for 5-10min at 70-90 ℃, and taking out for later use after the ultrasonic cleaning is finished.
And finally, coating and drying the coating. And uniformly coating the fluororesin coating on the inner wall and/or the outer wall of the insulated heat pipe, wherein the coating thickness is 1-100 mu m, and then putting the insulated heat pipe into a drying box, and drying the insulated heat pipe for 10-20min at 70-90 ℃ to obtain the compact impermeable fluororesin coating.
Example 1
The utility model provides an insulating heat pipe with fluororesin coating, includes epoxy heat absorption pipe, epoxy cooling tube, heat conduction epoxy heat dissipation wing and insulating flexible coupling pipe, and the epoxy heat absorption pipe is located epoxy cooling tube below, and the lumen volume of epoxy cooling tube equals with the lumen volume of epoxy heat absorption pipe. The tail ends of the epoxy heat absorption tube and the epoxy radiating tube are embedded into the heat-conducting epoxy radiating fins, the fins are fan-shaped, the insulating flexible connecting tube is linear, and two ends of the insulating flexible connecting tube extend into the epoxy heat absorption tube and the epoxy radiating tube.
The epoxy heat absorption pipe is filled with insulating cooling liquid, the content of the insulating cooling liquid is 40% of the volume of the epoxy heat absorption pipe, and the preparation method of the insulating cooling liquid comprises the following steps: in a vacuum stirring vessel, according to the mass percentage ratio of 100: 70: 50: 100 pouring decafluoropentane, hexafluorobutene, hydrofluoroether and ethylene glycol; vacuum-pumping to 1.5X 10-2Standing the mixed solution for 25min after Pa; mixing and stirring are carried out at 10 ℃ by using a paddle stirrer at 400rpm, and filling and sealing are carried out. The prepared insulating cooling liquid has the density of 1.5g/ml and the boiling point of 60 ℃.
The insulating heat pipe is made of a high-filling ultrahigh-heat-conductivity epoxy resin material, the material is prepared by mixing tetrabromobisphenol A type epoxy resin with boron nitride, aluminum oxide, aluminum nitride and zinc oxide heat-conducting powder, performing vacuum defoamation treatment, then performing vacuum casting, heating and curing in sections, and naturally cooling, wherein the mass percentage ratio of the tetrabromobisphenol A type epoxy resin to the heat-conducting powder is 100: 150.
The inner wall of the insulated heat pipe is provided with a compact impermeable fluororesin coating. Wherein, the fluororesin coating is prepared by the following method:
first, a fluororesin coating material is prepared.
In the first step, solution a is prepared. According to the mass percentage, 52 percent of methyl amyl ketone solvent, 18 percent of tetrafluoroethylene monomer, 18 percent of cyclohexyl vinyl ether monomer, 8 percent of tert-butyl peroxybenzoate and 4 percent of polyvinyl alcohol are uniformly mixed to prepare solution A.
Second, solution B is prepared. According to the mass percentage, 58 percent of methyl amyl ketone solvent, 12 percent of acrylic acid monomer, 26 percent of diallyl lauryl amine monomer and 4 percent of tert-butyl peroxybenzoate are mixed uniformly to prepare solution B.
Adding the solution A into a three-mouth reaction bottle, wherein the three-mouth reaction bottle is respectively connected with a reflux condenser tube, a dropping funnel and a constant-temperature heating stirrer, adding the solution B into the dropping funnel, heating to 80 ℃, starting the constant-temperature heating stirrer, and slowly dropping the solution B in the dropping funnel into the three-mouth reaction bottle within 2 h;
and fourthly, reacting for 1.5 hours after the dropwise adding is finished, and performing ultrasonic dispersion for 15 minutes at the ultrasonic frequency of 40KHz to prepare the fluororesin coating.
Secondly, the surface of the insulating heat pipe is pretreated. Phosphoric acid and hydrogen peroxide are mixed according to the mass percentage of 1: 1, soaking the insulated heat pipe in the cleaning solution for 20min, then taking out, checking that the surface is free of pollution, ultrasonically cleaning the insulated heat pipe by using deionized water for 15min, after that, putting the insulated heat pipe into a drying box, drying for 8min at 80 ℃, and taking out for later use.
And finally, coating and drying the coating. And (3) uniformly coating the fluororesin coating on the inner wall of the insulated heat pipe, wherein the coating thickness is 60 microns, putting the insulated heat pipe into a drying oven, and drying the insulated heat pipe for 15min at the temperature of 80 ℃ to obtain the compact impermeable fluororesin coating.
Example 2
The utility model provides an insulating heat pipe with fluororesin coating, includes epoxy heat absorption pipe, epoxy cooling tube, heat conduction epoxy heat dissipation wing and insulating flexible coupling pipe, and the epoxy heat absorption pipe is located epoxy cooling tube below, and the lumen volume of epoxy cooling tube is greater than the lumen volume of epoxy heat absorption pipe. The tail ends of the epoxy heat absorption pipe and the epoxy radiating pipe are embedded into the heat-conducting epoxy radiating fins, the fins are circular, the insulating flexible connecting pipe is in a U-shaped bent pipe, the bent pipe can be straightened, and two ends of the insulating flexible connecting pipe extend into the epoxy heat absorption pipe and the epoxy radiating pipe.
The epoxy heat absorption tube is filled with insulating cooling liquid, the content of the insulating cooling liquid is 45% of the volume of the epoxy heat absorption tube, and the preparation method of the insulating cooling liquid comprises the following steps: in a vacuum stirring vessel, according to the mass percentage ratio of 100: 75: 100: 70 pouring decafluoropentane, hexafluorobutene, hydrofluoroether and ethylene glycol; vacuum-pumping to 1.5X 10-2Standing the mixed solution for 30min after Pa; mixing and stirring are carried out at the temperature of 10 ℃ by using a paddle stirrer at the speed of 550rpm, and filling and sealing are carried out. The prepared insulating cooling liquid has the density of 1.6g/ml and the boiling point of 45 ℃.
The insulating heat pipe is made of a high-filling ultrahigh-heat-conductivity epoxy resin material, the material is prepared by mixing tetrabromobisphenol A type epoxy resin with boron nitride, aluminum oxide, aluminum nitride and zinc oxide heat-conducting powder, performing vacuum defoaming treatment, performing vacuum casting, heating and curing in sections, and naturally cooling, wherein the mass percentage ratio of the tetrabromobisphenol A type epoxy resin to the heat-conducting powder is 100: 165.
The inner wall of the insulated heat pipe is coated with a dense impermeable fluororesin coating. Wherein, the fluororesin coating is prepared by the following method:
first, a fluororesin coating material is prepared.
In the first step, solution a is prepared. According to the mass percentage, 50% of dimethyl carbonate solvent, 25% of vinylidene fluoride monomer, 15% of vinyl acetate monomer, 7% of azobisisovaleronitrile and 3% of polyvinyl alcohol are uniformly mixed to prepare solution A.
Second, solution B is prepared. According to the mass percentage, 50 percent of dimethyl carbonate solvent, 15 percent of acrylic acid monomer, 30 percent of diallyl dodecylamine monomer and 5 percent of tert-butyl peroxybenzoate are uniformly mixed to prepare solution B.
Adding the solution A into a three-mouth reaction bottle, wherein the three-mouth reaction bottle is respectively connected with a reflux condenser tube, a dropping funnel and a constant-temperature heating stirrer, adding the solution B into the dropping funnel, heating to 85 ℃, starting the constant-temperature heating stirrer, and slowly dropping the solution B in the dropping funnel into the three-mouth reaction bottle within 2 h;
and fourthly, reacting for 2 hours after the dropwise adding is finished, and performing ultrasonic dispersion for 20 minutes at the ultrasonic frequency of 50KHz to prepare the fluororesin coating.
Secondly, the surface of the insulating heat pipe is pretreated. Phosphoric acid and hydrogen peroxide are mixed according to the mass percentage of 1: 1.2, preparing a cleaning solution, soaking the insulated heat pipe in the cleaning solution for 25min, then taking out, checking that the surface is free of pollution, ultrasonically cleaning the insulated heat pipe with deionized water for 20min, after that, putting the insulated heat pipe into a drying box, drying for 10min at 90 ℃, and taking out for later use.
And finally, coating and drying the coating. And uniformly coating the fluororesin coating on the inner wall surface of the insulated heat pipe, wherein the coating thickness is 100 microns, putting the insulated heat pipe into a drying box, and drying the insulated heat pipe for 20min at 90 ℃ to obtain the compact impermeable fluororesin coating.
Example 3
The utility model provides an insulating heat pipe with fluororesin coating, includes epoxy heat absorption pipe, epoxy cooling tube, heat conduction epoxy heat dissipation wing and insulating flexible coupling pipe, and the epoxy heat absorption pipe is located epoxy cooling tube below, and the lumen volume of epoxy cooling tube equals the lumen volume of epoxy heat absorption pipe. The tail ends of the epoxy heat absorption pipe and the epoxy radiating pipe are embedded into the heat-conducting epoxy radiating fins, the insulating flexible connecting pipe is linear, and two ends of the insulating flexible connecting pipe extend into the epoxy heat absorption pipe and the epoxy radiating pipe.
The epoxy heat absorption tube is filled with insulating cooling liquid, the content of the insulating cooling liquid is 30% of the volume of the epoxy heat absorption tube, and the preparation method of the insulating cooling liquid comprises the following steps: in a vacuum stirring vessel, according to the mass percentage ratio of 100: 50: 100: 200 pouring decafluoropentane, hexafluorobutene, hydrofluoroether and ethylene glycol; vacuum-pumping to 1.5X 10-2Standing the mixed solution for 20min after Pa; mixing and stirring are carried out at 10 ℃ by using a paddle stirrer at 300rpm, and filling and sealing are carried out. The prepared insulating cooling liquid has the density of 1.3g/ml and the boiling point of 75 ℃.
The insulating heat pipe is made of a high-filling ultrahigh-heat-conductivity epoxy resin material, the material is prepared by mixing tetrabromobisphenol A type epoxy resin with boron nitride, aluminum oxide, aluminum nitride and zinc oxide heat-conducting powder, performing vacuum defoamation treatment, then performing vacuum casting, heating and curing in sections, and naturally cooling, wherein the mass percentage ratio of the tetrabromobisphenol A type epoxy resin to the heat-conducting powder is 100: 100.
The outer wall of the insulated heat pipe is provided with a compact impermeable fluororesin coating. Wherein, the fluororesin coating is prepared by the following method:
first, a fluororesin coating material is prepared.
In the first step, solution a is prepared. According to the mass percentage, 60 percent of methyl amyl ketone solvent, 15 percent of tetrafluoroethylene monomer, 15 percent of cyclohexyl vinyl ether monomer, 7 percent of tert-butyl peroxybenzoate and 3 percent of polyvinyl alcohol are uniformly mixed to prepare solution A.
Second, solution B is prepared. According to the mass percentage, 60 percent of methyl amyl ketone solvent, 10 percent of acrylic acid monomer, 25 percent of diallyl lauryl amine monomer and 5 percent of tert-butyl peroxybenzoate are uniformly mixed to prepare solution B.
Adding the solution A into a three-mouth reaction bottle, wherein the three-mouth reaction bottle is respectively connected with a reflux condenser tube, a dropping funnel and a constant-temperature heating stirrer, adding the solution B into the dropping funnel, heating to 70 ℃, starting the constant-temperature heating stirrer, and slowly dropping the solution B in the dropping funnel into the three-mouth reaction bottle within 1.5 h;
and fourthly, reacting for 1 hour after the dropwise adding is finished, and performing ultrasonic dispersion for 10 minutes at the ultrasonic frequency of 20KHz to prepare the fluororesin coating.
Secondly, the surface of the insulating heat pipe is pretreated. Phosphoric acid and hydrogen peroxide are mixed according to the mass percentage of 1: 0.8, soaking the insulated heat pipe in the cleaning solution for 15min, taking out, checking that the surface is free of pollution, ultrasonically cleaning the insulated heat pipe by using deionized water for 10min, putting the insulated heat pipe into a drying box after the ultrasonic cleaning is finished, drying the insulated heat pipe for 5min at 70 ℃, and taking out for later use.
And finally, coating and drying the coating. And uniformly coating the fluororesin coating on the outer wall surface of the insulating heat pipe, wherein the coating thickness is 1 mu m, and then putting the insulating heat pipe into a drying oven to dry for 10min at 70 ℃ to obtain the compact impermeable fluororesin coating.
Comparative example 1
Comparative example 1 differs from example 1 in that the fluororesin coating was prepared only with solution a and not with solution B.
Comparative example 2
The comparative example 2 is different from the example 1 in that the insulating heat pipe has no fluororesin coating.
The properties of the fluororesin coatings prepared in examples 1 to 3 above were compared with those of the fluororesin coating prepared in comparative example 1, and the specific results are shown in table 1:
TABLE 1 comparison of the coating Properties of fluorine resins of different examples and comparative examples
According to the data, the anti-seepage capability of the heat pipe can be effectively improved by coating the fluororesin coating on the inner wall of the insulating heat pipe; the hydrophobic anti-seepage performance of the coating can be obviously improved by adding the functional monomer when the fluororesin coating is prepared, and the adhesive force between the coating and the pipe wall is improved; the insulated heat pipe coated with the fluororesin coating on the inner wall has more excellent hydrophobic barrier properties than the heat pipe coated with the coating on the outer wall.
The performance of the insulated heat pipes prepared in the above examples 1 to 3 and comparative examples 1 to 2 was compared, and the specific results are shown in table 2:
TABLE 2 comparison of the performance of the insulated heat pipes of the different examples and the comparative example
The data show that the anti-seepage capability of the heat pipe is improved and the mechanical property and the electrical property of the heat pipe can be further improved by coating the inner wall of the insulating heat pipe with the fluororesin coating; the addition of the functional monomer during the preparation of the fluororesin coating can obviously improve the hydrophobic and anti-seepage performance of the coating, improve the adhesive force between the coating and the pipe wall and also play a positive role in the electrical performance of the insulated heat pipe.
In conclusion, the insulating heat pipe has the advantages that the insulating heat pipe is integrated, supplemented and interacted by the highly-filled ultrahigh-heat-conductivity epoxy resin material, the insulating cooling liquid evaporation and condensation circulation and the fluororesin coating, so that the heat dissipation efficiency of the insulating heat pipe is improved, the insulating heat pipe is ensured to be safely and efficiently applied to the field of high-voltage electrical equipment, and the service life of the insulating heat pipe can be prolonged.
The foregoing describes preferred embodiments of the present invention, and is intended to provide a clear and concise description of the spirit and scope of the invention, and not to limit the same, but to include all modifications, substitutions, and alterations falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An insulated heat pipe with a compact impermeable fluororesin coating is characterized in that the insulated heat pipe comprises at least one group of heat pipe subunits;
the heat pipe subunit comprises an epoxy heat absorption pipe, an epoxy radiating pipe, a heat conduction epoxy radiating fin and an insulation flexible connecting pipe;
the epoxy heat absorption tubes are positioned below the epoxy radiating tubes, and the tail ends of the epoxy heat absorption tubes and the tail ends of the epoxy radiating tubes are embedded into the heat-conducting epoxy radiating fins;
two ends of the insulating flexible connecting pipe extend into the epoxy heat absorption pipe and the epoxy radiating pipe and are used for communicating the epoxy heat absorption pipe with the epoxy radiating pipe;
the insulating heat pipe is prepared from a high-filling ultrahigh heat-conducting epoxy resin material, wherein the epoxy resin material comprises an epoxy resin base material and heat-conducting powder;
the inner wall and/or the outer wall of the insulating heat pipe is/are provided with a compact anti-seepage fluororesin coating;
and insulating cooling liquid is filled in the epoxy heat absorption pipe, and the insulating cooling liquid comprises fluorine-containing solution and alcohol solution.
2. The insulated heat pipe of claim 1, wherein the highly filled ultra-high thermal conductive epoxy material is made by mixing an epoxy base material with a thermal conductive powder; the mass percentage ratio of the epoxy resin base material to the heat-conducting powder is 100: (100-165).
3. The insulated heat pipe of claim 1, wherein the epoxy material has a thermal conductivity of 2.5 w.m or more-1·K-1Volume resistance is not less than 2.2X 1015Ω·cm。
4. An insulated heat pipe as claimed in claim 1, wherein said fluororesin coating layer is prepared by a method comprising the steps of:
a. pretreating the surface of the insulating heat pipe;
b. preparing a coating:
and (3) uniformly coating the fluororesin coating on the wall of the insulating heat pipe, and drying to obtain the compact impermeable fluororesin coating.
5. An insulated heat pipe as set forth in claim 4, wherein said fluororesin coating is prepared by a method comprising the steps of:
s1: uniformly mixing a solvent, a fluoroolefin monomer, a vinyl monomer, an initiator and a dispersing agent according to a ratio to prepare a mixed solution A;
s2: uniformly mixing a solvent, acrylic acid, diallyldodecylamine and an initiator according to a ratio to obtain a mixed solution B;
s3: mixing the solution A and the solution B, and heating and stirring;
s5: and after the reaction is finished, performing ultrasonic dispersion for 10-20 minutes at the ultrasonic frequency of 20-50KHz to prepare the fluororesin coating.
6. An insulating heat pipe as claimed in claim 5, wherein the solution A comprises the following components in percentage by mass: solvent: fluoroolefin monomer: vinyl monomer (B): initiator: dispersant = (10-12): (3-5): (3-5): (1.4-2): (0.6-1);
the solution B comprises the following components in percentage by mass: solvent: acrylic acid: diallyldodecylamine: initiator = (10-13): (2-3): (5-7): (0.6-1).
7. The insulated heat pipe of any of claims 5 to 6 wherein the fluoroolefin monomer is selected from one or more of vinylidene fluoride, tetrafluoroethylene, trifluoropropene, hexafluoropropene.
8. An insulated heat pipe as set forth in claim 1, characterized in that said fluororesin coating has a vapor permeability coefficient k of 1.0 x 10 or less-11g/(m · s · Pa); the thickness is 1-100 μm, the surface tension is less than or equal to 12mN/m, the hydrophobic angle is more than 150 degrees, and the volume resistance is more than or equal to 4.6 multiplied by 1016Omega cm, surface resistance not less than 1.0X 1017Ω。
9. The insulated heat pipe of claim 1 wherein the fluorine-containing solution comprises one or more of decafluoropentane, hexafluorobutene, hydrofluoroether; the alcohol solution is ethylene glycol; the mass percentage ratio of the ethylene glycol to the fluorine-containing solution is 1: (0.5-1.5).
10. The insulated heat pipe of claim 1, wherein the density of the insulating coolant is 1.3-1.6g/ml, and the volume resistance is 1.0 x 109Omega cm, and the volume of the filling tube cavity is 30-50%.
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