KR102109721B1 - Hybrid Heat Insulation Sheet - Google Patents

Abstract

The present invention relates to a hybrid insulating sheet, a heat spreader for dissipating the transferred heat; A heat delay unit that conducts the heat dispersed in the heat spreader by delaying time; And a heat insulating part that collects and insulates the heat conducted by the time delay in the heat delay part to insulate.

Description

Hybrid heat insulation sheet

The present invention relates to a heat-insulating sheet, and more particularly, to a hybrid heat-insulating sheet capable of improving heat insulation efficiency by hybridizing a structure capable of sequentially performing heat dispersion, heat delay, and heat insulation.

In recent years, electronic products including portable terminals have been continuously developed, and electronic products are promoting high performance and multifunctionality according to user demands.

In particular, in order to maximize the portability and convenience of the user, the portable terminal is required to be compact and lightweight, and components integrated in an increasingly small space are mounted for high performance. Accordingly, the parts used in the portable terminal have a high heat generation temperature due to high performance, and the increased heat generation temperature causes a problem of deteriorating the performance of the portable terminal by applying an influence to adjacent parts.

In order to solve the problem by such heat generation, various insulating materials have been applied to portable terminals, but various researches and technology developments have been made on insulation since an optimal insulating material having a thin thickness and excellent insulation performance has not been developed.

Korean Registered Patent Publication No. 10-1134880 discloses a portable terminal having an insulating film composed of an insulating film disposed on the front of the LCD, so that heat generated from the portable terminal is transferred to the user's face through the LCD. There is an advantage that can be prevented. However, such a heat-insulating film has a problem in that its configuration is not specific and the heat-insulating performance cannot be known, so that it is impossible to solve the heat problem generated in the recently high-performance portable terminal.

Accordingly, the present inventors continuously conducted research on insulation technology capable of slimming and excellent insulation performance to derive structural characteristics of an insulation sheet that can sequentially perform heat dispersion, heat delay, and insulation. By inventing, the present invention was completed to be more economical, applicable and competitive.

Korean Registered Patent Publication No. 10-1134880

The present invention has been devised in view of the problems of the prior art, and its object is to provide a hybrid heat insulating sheet capable of maximizing heat insulating efficiency by hybridizing a multi-functional structure capable of blocking heat.

Another object of the present invention is to provide an ultra-thin and ultra-slim hybrid insulating sheet by applying a structure capable of sequentially performing heat dissipation, heat delay, and heat insulation, and thinning.

Another object of the present invention is to include a nano-fiber web arranged in a three-dimensional network structure in a heat-insulating sheet, a hybrid capable of improving heat-insulating performance with three-dimensional nano-sized fine pores of a nano-fiber web having a large heat trapping ability. In providing an insulating sheet.

In order to achieve the above object, an embodiment of the present invention, a heat spreader for dispersing the transferred heat; A heat delay unit that conducts the heat dispersed in the heat spreader by delaying time; And a heat insulating part that collects and insulates the heat conducted by the time delay in the heat delay part to insulate.

As described above, in the present invention, a hybrid insulating sheet having a multilayer structure in which a structure for dissipating heat generated in a heating element, a structure for delaying the dispersed heat in time, and a structure for trapping and blocking heat is stacked is implemented. There is an advantage that can maximize the insulation efficiency.

In the present invention, by adopting an insulating sheet of nanofiber webs in which electrospun nanofibers are arranged in a three-dimensional network structure, it is possible to improve thermal insulation performance with three-dimensional nano-sized micro-pores of nanofiber webs with high heat trapping ability. Technology.

In the present invention, the heat-insulating sheet containing a phase change material capable of delaying the heat conduction time is hybridized with a sheet capable of heat dissipation and heat insulation, which has the advantage of improving the heat blocking efficiency.

In the present invention, since heat dissipation, heat delay, and heat insulation can be performed sequentially, it is excellent in heat insulation performance and can be mounted on high-performance electronic products. At the same time, the thickness of the three-layer structure can be thinned, resulting in ultra-thin and ultra-slim. There is an effect that can be applied to electronic products, including portable terminals.

1 is a conceptual cross-sectional view for explaining a hybrid thermal insulation sheet according to an embodiment of the present invention,
2A and 2B are conceptual cross-sectional views for explaining a laminated structure of a nanofiber web and a nonwoven fabric applied as a heat insulating part of the hybrid heat insulating sheet of FIG. 1,
3 is a conceptual cross-sectional view for explaining the heat flow in the hybrid thermal insulation sheet according to an embodiment of the present invention,
4 is a schematic cross-sectional view showing an electrospinning device forming a nanofiber web applied to a hybrid thermal insulation sheet according to an embodiment of the present invention.

The terms or words used in the present specification and claims should not be interpreted as being limited to ordinary or dictionary meanings, and the inventor can appropriately define the concept of terms in order to best describe his or her invention. Based on the principle that it should be interpreted as meanings and concepts consistent with the technical spirit of the present invention.

Therefore, the configuration shown in the embodiments and drawings described in this specification is only one of the most preferred embodiments of the present invention and does not represent all of the technical spirit of the present invention, and thus can replace them at the time of application. It should be understood that there may be equivalents and variations.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

The hybrid thermal insulation sheet of the present invention described later may be applied to a portable terminal, a refrigerator, and a building, but the present invention is not limited thereto, and the same may be applied to thermal insulation materials used in other industrial fields.

1 is a conceptual cross-sectional view for explaining a hybrid thermal insulation sheet according to an embodiment of the present invention, and FIGS. 2A and 2B illustrate a laminated structure of a nanofiber web and a nonwoven fabric applied as thermal insulation of the hybrid thermal insulation sheet of FIG. 1 It is a conceptual section for doing.

Referring to FIG. 1, a hybrid heat insulating sheet 100 according to an embodiment of the present invention includes a heat spreader 110, a heat delay part 120, and a heat insulating part 130.

The heat spreader 110, the heat delay part 120, and the heat insulating part 130 are sequentially stacked, so that the hybrid heat insulating sheet 100 has a three-layer structure.

The heat spreader 110 dissipates heat transferred from the outside. That is, the heat spreader 110 prevents the heat generated from the heat generating component from being concentrated in one place and disperses heat. Heat spreader 110 has a high thermal conductivity, it is preferable to use an inexpensive copper or aluminum material, nickel plating can be performed on the heat spreader 110 of the copper material to solve the oxidation and corrosion problems. have. And, the thickness of the heat spreader 110 is preferably 10㎛-40㎛.

The heat delay unit 120 delays the heat dissipated from the heat spreader 110 to conduct to the heat insulation unit 130 in time. It is preferable that the thermal delay part 120 includes a phase change material (PCM). The phase change material absorbs the heat transferred and retards the thermal conductivity. That is, the phase change material absorbs heat while changing from a solid phase to a liquid phase by absorbing heat when heat is transferred. And the phase change material changes back to solid phase when the ambient temperature drops.

When explaining an example of the manufacturing method of the thermal delay unit 120, first, the phase change material is powdered, and then mixed with the powder, binder, and solvent of the phase change material to prepare a slurry in which the powder of the phase change material is dispersed, and The slurry is filmed to prepare a film in which the powder of the phase change material is dispersed, and this is applied to the heat delay unit 120.

In addition, in another example of the manufacturing method of the heat delay part 120, the heat spreader 110 is placed on a hot plate, and a powder of a phase change material is applied on the top of the heat spreader 110, so that the temperature of the hot plate ( For example, after the powder of the phase change material is made into a liquid at approximately 65 ° C., and the heat spreader 110 is removed from the hot plate, the phase change material becomes a film. The thickness of the heat delay portion 120 is preferably 10㎛-30㎛.

The heat insulation unit 130 collects heat conducted by the heat delay unit 120 to block heat. At this time, the heat insulating unit 130 is preferably applied as a nanofiber web having a three-dimensional microporous structure integrated by nanofibers. In addition, the thickness of the insulating portion 130 is preferably 10㎛-30㎛.

As described above, the hybrid insulating sheet 100 according to an embodiment of the present invention can sequentially perform heat dissipation, heat delay, and heat insulation, and thus has excellent heat insulation performance, and thus can be applied to a high-performance portable terminal. Since the thickness of the three-layer structure can be made thin, there is an advantage that it can be adopted in ultra-thin and ultra-slim portable terminals.

In addition, the nanofiber web is arranged in a three-dimensional network structure in which electrospun nanofibers are irregularly stacked. The nanofibers form irregularly distributed three-dimensional fine pores in the nanofiber web, and the three-dimensional fine pores increase the heat trapping ability of the nanofiber web, thereby providing excellent thermal insulation performance.

On the other hand, the nanofiber web is capable of electrospinning and mixes a polymer material with a low thermal conductivity and a solvent in a certain ratio to make a spinning solution, and the spinning solution is electrospun to form nanofibers, and the nanofibers are accumulated to form a number of It is formed in the form of nanofiber webs with pores.

The smaller the diameter of the nanofibers, the greater the specific surface area of the nanofibers and the greater the heat trapping ability of the nanofibrous web with a large number of micropores, thereby improving the thermal insulation performance.

The nanofibers are made of, for example, a diameter of 1 um or less, and the nanoweb made of nanofibers can trap and trap air inside the micropores as it has a plurality of micropores in a three-dimensional structure.

The micropore formed in the nanoweb is preferably set to 4nm to 1um or less, and can be implemented by adjusting the diameter of the nanofiber.

Here, the spinning method applied to the present invention includes general electrospinning, air-electrospinning (AES), electrospray, electrobrown spinning, and centrifugal electrospinning. , Flash-electrospinning can be used.

In the present invention, for the purpose of improving the heat resistance of the nanofibrous web of the hybrid insulating sheet, a polymer with low heat conductivity and heat resistance at the same time or a polymer with low heat conductivity and a polymer having excellent heat resistance are electrospinned by electrospinning. The obtained nanoweb can be applied.

At this time, the polymer usable in the present invention is preferably dissolved in an organic solvent and capable of spinning, and at the same time has a low thermal conductivity, and more preferably excellent heat resistance.

Polymers capable of spinning and having low thermal conductivity are, for example, polyurethane (PU), polystyrene, polyvinyl chloride, cellulose acetate, polyvinylidene fluoride (PVDF), polyacrylonitrile (PAN), polymethyl methacrylate , Polyvinyl acetate, polyvinyl alcohol, polyimide, and the like.

In addition, a polymer having excellent heat resistance can be dissolved in an organic solvent for electrospinning and has a melting point of 180 ° C or higher, for example, polyacrylonitrile (PAN), polyamide, polyimide, polyamideimide, poly ( Aromatic polyesters such as meta-phenylene isophthalamide), polysulfone, polyether ketone, polyethylene terephthalate, polytrimethylene telephthalate, polyethylene naphthalate, polytetrafluoroethylene, polydiphenoxyphosphazene, poly Polyurethane copolymers including polyphosphazenes such as {bis [2- (2-methoxyethoxy) phosphagen], polyurethane and polyether urethane, cellulose acetate, cellulose acetate butylate, cellulose acetate propionate Etc. can be used.

The thermal conductivity of the polymer is preferably set to less than 0.1W / mK.

Among the polymers, polyurethane (PU) has a thermal conductivity of 0.016 to 0.040 W / mK, and polystyrene and polyvinyl chloride are known to have a thermal conductivity of 0.033 to 0.040 W / mK, and the nanoweb obtained by spinning them also has a low thermal conductivity.

In addition, it can be manufactured to have a variety of thickness by laminating the nano-web in multiple layers. That is, the insulating sheet of the nanofiber web applied to the present invention can be made of an ultra-thin structure and have high insulating performance.

Solvents are DMA (dimethyl acetamide), DMF (N, N-dimethylformamide), NMP (N-methyl-2-pyrrolidinone), DMSO (dimethyl sulfoxide), THF (tetra-hydrofuran), DMAc (di-methylacetamide), EC ( Any one or more selected from the group consisting of ethylene carbonate), DEC (diethyl carbonate), DMC (dimethyl carbonate), EMC (ethyl methyl carbonate), PC (propylene carbonate), water, acetic acid, and acetone can be used. Can be.

Since the nanofiber web is manufactured by an electrospinning method, the thickness is determined according to the amount of radiation of the spinning solution. Therefore, there is an advantage that it is easy to make the thickness of the nanofiber web to a desired thickness.

As described above, since the nanofibers are formed in the form of nanofiber webs in which nanofibers are accumulated by the spinning method, it can be made into a form having a plurality of pores without a separate process, and it is also possible to control the size of the pores according to the amount of radiation of the spinning solution. Therefore, it is possible to make a large number of pores, so it is excellent in heat shielding performance, and accordingly, thermal insulation performance can be improved.

In the present invention, inorganic particles, which are insulating fillers for blocking heat transfer, may be contained in the spinning solution for forming the nanofiber web. In this case, the nanofibers of the nanofiber web may contain inorganic particles. The inorganic particles are located inside the spun nanofiber, or a part of the nanofiber surface is exposed to block heat transfer. In addition, the inorganic particles can improve the strength of the nanofiber web as an insulating filler.

Preferably, the inorganic particles are SiO ₂ , SiON, Si ₃ N ₄ , HfO ₂ , ZrO ₂ , Al ₂ O ₃ , TiO ₂ , Ta ₂ O ₅ , MgO, Y ₂ O ₃ , BaTiO ₃ , ZrSiO ₄ , HfO One or more particles selected from the group consisting of ₂ , or one or more particles selected from the group consisting of glass fiber, graphite, rock wool, and clay are preferred, but are not limited thereto, and these alone or 2 It can be included in the spinning solution by mixing more than one species.

In addition, fumed silica may be included in the spinning solution for forming the nanofiber web.

Referring to Figures 2a and 2b, the insulating portion 130 of the hybrid insulating sheet according to an embodiment of the present invention is a laminated structure of the nanofiber web 131 and the nonwoven fabric 132 (Figure 2a), or nanofiber web It can be applied as a laminated structure (FIG. 2B) of (131) / non-woven fabric 132 / nanofiber web 133. At this time, the thickness t1 of the nanofiber web 131 is preferably thinner than the thickness t2 of the nonwoven fabric 132.

As described above, when the insulating portion 130 is applied in a stacked structure of the nanofiber web 131 and the nonwoven fabric 132, the nonwoven fabric 132 is cheaper than the nanofiber web 131 and has high strength. It is possible to improve the strength while reducing the manufacturing cost of the hybrid insulating sheet. In addition to this, the nonwoven fabric 132 also has a plurality of pores, and thus has a function of collecting heat to serve as a heat insulator.

Here, the nanofiber web 131 and the nonwoven fabric 132 may be fused due to thermal compression, and the melting point of the nanofiber web 131 is designed to be lower than the melting point of the nonwoven fabric 132, and the heat is applied during heat compression. It is preferable that the nanofiber web 131 is melted and fused to the nonwoven fabric 132. For example, when the polymer material for forming the nanofiber web 131 is applied as PVdF, the melting point of PVdF is 155 ° C, so the nonwoven fabric 132 is a polyester series having a melting point higher than 155 ° C, A nonwoven fabric 132 made of one of nylon and cellulose is applied.

Therefore, upon thermal compression, the region of the nanofiber web 131 in contact with the nonwoven fabric 132 melts and fuses with the nonwoven fabric 132. Here, since the pore size of the nonwoven fabric 132 is significantly larger than the pore size of the nanoweb, a portion of the melted nanofiber web 131 penetrates into the pores of the nonwoven fabric 132. That is, the nanofiber web 131 melted in the direction of the nanofiber web 131 and the nonwoven fabric 132 at the interface after heat pressing, based on the interface between the nonwoven fabric 132 and the nanofiber web 131 before being thermally compressed. ) Is diffused and distributed. Based on these technical characteristics, when the degree of the amount of melt of the nanofiber web 131 is adjusted, the nanofiber web 131 is melted in the pores of the nonwoven fabric 132, and the nano-permeated nanopores in the nonwoven fabric 132. The fiber web 131 performs a role of locking, thereby improving adhesion between the nanofiber web 131 and the nonwoven fabric 132.

In the present invention, as a polymer material forming a nano web, a polymer material in which PVdF and PAN are mixed in a ratio of 5; 5 can be applied. At this time, the electrospun nanofibers are formed in a structure having a core made of PAN and an outer skin made of PVdF surrounding the core outer circumferential surface, and the nanofibers having such a structure are stacked to form a nanofiber web 131. When the nanofiber web 131 and the nonwoven fabric 132 on which the nanofibers having the core and outer skin structures are stacked are thermally compressed, PVdF of the outer skin melts and permeates and fuses to the nonwoven fabric 132.

3 is a conceptual cross-sectional view for explaining the heat flow in the hybrid thermal insulation sheet according to an embodiment of the present invention.

Hybrid insulation sheet according to an embodiment of the present invention is attached to a heating component, a structure for dispersing heat generated in the heating component, a structure for delaying the heat dispersed in time, and a structure for trapping heat to block heat It can maximize the insulation efficiency.

Referring to FIG. 3, when a hotspot 111 in which heat is intensively transferred to a local area of the heat spreader 110 is generated, heat transferred from the hotspot 111 is distributed throughout the heat spreader 110. do.

When the heat transferred from the hot spot 111 of the heat spreader 110 is filled in the heat spreader 110, it is transferred to the heat delay unit 120. Here, even if the heat spreader 110 is not full of heat, heat is transferred to the heat delay unit 120 that is close to the hot spot 111.

The heat delay unit 120 delays the time when the transferred heat is transferred from the heat delay unit 120 to the heat insulation unit 130. That is, since the heat delay unit 120 includes a phase change material (PCM), heat transferred to the heat delay unit 120 is absorbed by the phase change material. At this time, the phase change material continuously absorbs heat for a predetermined period of time until it is completely changed from the solid phase to the liquid phase, so that the time transferred from the heat delay part 120 to the heat insulating part 130 can be delayed.

The heat delayed from the heat delay unit 120 is transferred to the heat insulation unit 130. The heat insulating part 130 made of the nanofiber web traps heat transferred from the heat insulating part 130 as three-dimensional fine pores to block heat.

As described above, the hybrid thermal insulation sheet according to an embodiment of the present invention disperses heat transferred from the heat generating component from the heat spreader 110 and delays heat in the thermal delay unit 120 to the thermal insulation unit 130. It is a hybrid thermal insulation structure that transmits and collects and blocks heat transferred from the thermal insulation unit 130.

For example, when 100 ° C. heat is conducted to the hot spot 111 of the heat spreader 110, heat of 90 ° C. is transferred to the heat delay unit 120 by the dispersion function in the heat spread 110, and the heat delay unit ( In 120), while delaying the time of heat transfer to the heat insulating part 130, the heat is lowered to 70 ° C by latent heat by the endothermic reaction of the phase change material and transferred to the heat insulating part 130. In the heat insulating part 130, heat is collected from the nanofiber web and stored at a lower temperature of 30 ° C to 40 ° C to accumulate heat to improve heat insulation performance.

On the other hand, the hybrid thermal insulation sheet according to an embodiment of the present invention, the heat delay unit 120 so that the latent heat function can be effectively exhibited, the heat spreader 110 to the heat delay unit 120 than the temperature of the heat conducting 2 ℃ -5 It is preferable to implement the thermal delay unit 120 with a phase change material that is phase-changed at a low temperature.

4 is a schematic cross-sectional view showing an electrospinning device forming a nanofiber web applied to a hybrid thermal insulation sheet according to an embodiment of the present invention.

Referring to FIG. 4, the electrospinning apparatus is a mixing incorporating a stirrer 2 using a mixing motor 2a using pneumatics as a driving source to prevent phase separation until mixing is performed by mixing a polymer material and a solvent having low thermal conductivity and spinning. It includes a mixing tank (1) and a plurality of radiation nozzles (4) connected to a high voltage generator. The polymer solution discharged from the mixing tank (1) to a plurality of spinning nozzles (4) connected via a metering pump (not shown) and a transfer pipe (3) passes through the spinning nozzle (4) charged by a high voltage generator while nanofibers ( The nanofibers 5 are accumulated on the grounded collector 6 in the form of a conveyor that is discharged to 5 and moves at a constant speed to form a porous nanofiber web 7.

In general, when a multi-hole spinning pack (for example, 245mm / 61 holes) is applied for mass production, mutual interference between multi-holes occurs, and fibers are blown away, and collection is not performed. As a result, the separation membrane obtained by using a multi-hole radiation pack becomes too bulky, and thus the formation of the separation membrane becomes difficult and serves as a cause of trouble of radiation.

In consideration of this, in the present invention, as illustrated in FIG. 4, porous nanofibers are produced by an air electrospinning method in which air 4a is injected for each spinning nozzle 4 using a multi-hole spinning pack. The web 7 is produced.

That is, in the present invention, when electric spinning is performed by air electrospinning, air is sprayed from the outer periphery of the spinning nozzle, and thus, air is more rigid by collecting and accumulating fibers made of high-volume polymers, thereby making air more dominant. It is possible to produce this high-fiber nanofiber web, and it is possible to minimize spinning troubles that may occur while fibers are flying.

In the present invention, when mixing and spinning a polymer material having low thermal conductivity and a heat-resistant polymer material, it is preferable to prepare a mixed spinning solution by adding it to a two-component solvent.

The obtained porous nanofiber web 7 is then calendered at a temperature below the melting point of the polymer in the calender device 9 to obtain a thin film nanofiber web 10 used as a core material.

In the present invention, as necessary, the porous nanofiber web 7 obtained as described above remains on the surface of the nanofiber web 7 while passing through a pre-air dry zone by the preheater 8. It is also possible to go through a process of adjusting the amount of solvent and moisture, followed by a calendaring process.

The pre-air dry zone by the preheater 8 applies air of 20-40 ° C. to the web using a fan, and the solvent remaining on the surface of the nanofiber web 7 and By controlling the amount of moisture, the nanofiber web 7 is controlled to be bulky, thereby increasing the strength of the separator and simultaneously controlling the porosity.

In this case, when calendaring is performed in a state in which the volatilization of the solvent is excessive, the porosity increases, but the strength of the nanofiber web decreases, and when the volatilization of the solvent decreases, the nanofiber web melts.

The method of forming the porous nanofiber web 10 by using the electrospinning device of FIG. 4 is first, a polymer material with low thermal conductivity alone, a mixture of a polymer material with low thermal conductivity and a heat-resistant polymer material dissolved in a solvent to dissolve the spinning solution. Prepare. In this case, a predetermined amount of inorganic particles may be added to the spinning solution to reinforce heat resistance, if necessary. In addition, preferably, when a nanofiber web is formed using a polymer material having low heat conductivity and excellent heat resistance, for example, polyurethane (PU), it has both heat insulating properties and heat resistance properties.

Thereafter, the spinning solution is directly radiated to the collector 6 using an electrospinning device, or radiated to a porous substrate 11 such as a non-woven fabric to form a monolayered porous nanofiber web 10 or a porous nanofiber web 10 A nano-fiber web sheet having a multi-layered structure made of a super-porous substrate 11 is produced.

In the present invention, the porous nanofiber web 10 can be applied as a heat insulating material for a portable terminal, and can be applied as a heat insulating material for a building or a refrigerator. After preparing a large area nanofiber web sheet according to the use, It is also possible to use it by cutting in a predetermined shape.

In the case of a heat insulating material for construction or refrigerator, after the obtained nanofiber web sheet is cut to a desired width when it is wide, it is folded several times in a plate shape to have a desired thickness, or wound in a plate shape by a winding machine, or a plurality of desired shapes. After cutting the core sheet, it is laminated in multiple layers. In addition, after stacking in multiple layers, it can be cut into a desired shape. If necessary, the stacking density can be increased by hot or cold pressing a plurality of stacked nanofiber web sheets.

On the other hand, in the present invention, when forming a nanofiber web, the spinning solution is spun on a transfer sheet made of paper, a nonwoven fabric made of a polymer material that does not dissolve by a solvent contained in a spinning solution, or a polyolefin-based film. After the web is formed, the nanofiber web sheet can be produced by separating the nanofiber web from the transfer sheet and laminating with a nonwoven fabric, and the obtained sheet can be stacked in multiple stages. As the nanofiber web is produced using the transfer sheet described above, productivity can be improved in a mass production process.

In the above, the present invention has been shown and described with reference to specific preferred embodiments, for example, but the present invention is not limited to the above-described embodiments, and is within the scope of the present invention without departing from the spirit of the present invention. Various changes and modifications will be possible by those who have.

100: hybrid insulation sheet 110: heat spreader
120: thermal delay 130: thermal insulation
131,133: Nanofiber web 132: Non-woven fabric

Claims (17)

A heat spreader that disperses the transferred heat;
A heat delay unit that conducts the heat dispersed in the heat spreader by delaying time; And
It includes; a heat insulating unit for collecting heat insulated by delaying the time from the heat delay unit;
The heat insulation portion comprises a nanofiber web having a plurality of pores for heat collection and made of irregularly accumulated nanofibers of a polymer material having a diameter of 1 μm or less by electrospinning of a spinning solution obtained by mixing a polymer material and a solvent, ,
The insulating portion is a hybrid insulating sheet, characterized in that the two-layer structure in which the nanofiber web and the nonwoven fabric are laminated, or the three-layer structure in which the nanofiber web is laminated on both sides of the nonwoven fabric. The hybrid insulating sheet according to claim 1, wherein the material of the heat spreader is copper. The hybrid heat insulating sheet according to claim 2, wherein the heat spreader further comprises a nickel plating layer plated on the copper. The hybrid insulating sheet of claim 1, wherein the heat delay part includes a phase change material (PCM). The hybrid heat insulating sheet according to claim 4, wherein the phase change material is phase-changed at a temperature of 2 ° C to 5 ° C lower than the temperature of heat conducted from the heat spreader to the heat delay part. The hybrid insulating sheet according to claim 4, wherein the heat delay part is a film in which the powder of the phase change material is dispersed. delete The hybrid insulating sheet of claim 1, wherein the spinning solution further comprises inorganic particles.
delete According to claim 1, The thickness of the nanofiber web is a hybrid thermal insulation sheet thinner than the thickness of the nonwoven fabric. The hybrid insulating sheet of claim 1, wherein the nonwoven fabric and the nanofiber web are thermally compressed to melt a nanofiber web region in contact with the nonwoven fabric and fuse to the nonwoven fabric. The method of claim 11,
A hybrid insulating sheet having a melting point of the nanofiber web lower than that of the nonwoven fabric. The method of claim 11,
The nanofiber web is made of PVdF,
The non-woven fabric is a hybrid insulating sheet that is one of polyester, nylon and cellulose series. The method of claim 11,
A portion of the melted nanofiber web is a hybrid insulating sheet that penetrates into the pores of the nonwoven fabric. The method of claim 11,
The polymer material is a hybrid insulating sheet that is a polymer material mixed with PVdF and PAN 5; 5. The method of claim 15,
The nanofibers constituting the nanofiber web, a hybrid insulating sheet having a core made of PAN and an outer skin made of PVdF surrounding the outer circumferential surface of the core. The method of claim 16,
When the nanofibrous web and the nonwoven fabric are thermally compressed, a PVDF of the outer skin is melted and fused to the nonwoven fabric to be a hybrid insulating sheet.

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