KR20150043051A - Hybrid Heat Insulation Sheet and Manufacturing Method thereof - Google Patents

Abstract

The present invention relates to a hybrid insulation sheet and a manufacturing method thereof. The hybrid insulation sheet comprises: a heat spreader spreading transmitted heat; a heat delay unit delaying the heat spread from the heat spreader in time to be conducted; an outer cover unit which covers the heat delay unit and is fixated on the heat spreader; and an insulation unit collecting the heat conducted from the outer cover unit to be insulated.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hybrid thermal insulation sheet,

The present invention relates to a heat insulating sheet, and more particularly, to a heat insulating structure in which a heat spreading edge, which is a phase change material, is interposed between an outer skin and a heat spreader and an outer skin is fixed to a heat spreader, Heat dispersion, and heat insulation in order to improve the heat insulation performance, and to provide an ultra-thin and ultra-thin hybrid heat-insulating sheet and a method of manufacturing the same.

2. Description of the Related Art In recent years, electronic products including portable terminals have been continuously developed, and electronic products have been promoted in terms of high performance and versatility according to the needs of users.

Particularly, in order to maximize the portability and convenience of users, miniaturization and weight reduction are indispensable for a portable terminal, and components integrated in smaller and smaller spaces are mounted for high performance. Accordingly, the parts used in the portable terminal have higher performance and higher heat generation temperature, and the increased heat generation temperature affects the adjacent components, thereby causing a problem of deteriorating the performance of the portable terminal.

Various heat insulating materials have been applied to portable terminals in order to solve the problem by such heat generation. However, various researches and technologies have been developed for insulation since an optimal heat insulating material having a thin thickness and excellent heat insulating performance has not been developed.

Korean Patent Publication No. 10-1134880 discloses a portable terminal having a heat insulating film including a heat insulating film disposed on the front surface of an LCD, and heat generated from the portable terminal is transmitted to the user's face through an LCD There is an advantage that it can be prevented. However, such a heat insulating film is not specific in its constitution, and its heat insulating performance can not be known, and there is a problem that a heat problem generated in a recent high performance portable terminal can not be solved.

Therefore, the inventors of the present invention have continued to study insulation technology capable of being slim and capable of excelling in heat insulation performance, thereby deriving the structural characteristics of a heat-insulating sheet capable of successively performing heat dispersion, heat delay, and insulation By inventing, we have completed the present invention which is more economical, usable and competitive.

Korean Patent Registration No. 10-1134880

SUMMARY OF THE INVENTION The present invention has been accomplished in view of the problems of the prior art, and it is an object of the present invention to provide a heat spreader, which is a phase change material placed between an outer skin and a heat spreader, Which is capable of preventing leakage when the phase is changed to the phase-changeable state, and a method of manufacturing the same.

Another object of the present invention is to provide a hybrid thermal insulation sheet capable of maximizing heat insulation efficiency by hybridizing a multi-functional structure capable of blocking heat, and a method of manufacturing the same.

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

It is still another object of the present invention to provide a nanofiber web in which a nanofiber web arranged in a three-dimensional network structure is included in a heat insulating sheet, An insulating sheet and a method of manufacturing the same.

In order to achieve the above-mentioned object, an embodiment of the present invention is a heat spreader for dispersing heat transferred thereto; A heat spread edge which conducts the heat dispersed in the heat spreader with a time delay; An outer skin that surrounds the heat paper edge and is fixed to the heat spreader; And a heat insulating portion for collecting and insulating the heat conducted from the outer skin.

In addition, an embodiment of the present invention provides a heat spreader for dispersing heat transferred thereto; A guide portion fixed to the heat spreader and having at least one through hole; A heat spread edge portion which is filled in the through hole of the guide portion and which conducts the heat dispersed in the heat spreader with a time delay; An outer skin surrounding the heating edge and fixed to the guide; And a heat insulating portion for collecting and insulating the heat conducted from the outer skin.

In addition, an embodiment of the present invention provides a method of manufacturing a heat spreader, comprising: stacking a heat paper edge on a heat spreader for dispersing transmitted heat; Fixing the outer skin to the heat spreader so as to surround the heat paper edge; And laminating the heat insulating portion on the outer skin.

As described above, in the present invention, a structure in which the heat-softening edge portion, which is a phase change material, is interposed between the outer skin and the heat spreader, and the outer skin is fixed to the heat spreader, It is possible to prevent leakage of the liquid to the outside or penetration into the fine pores of the heat insulating portion when the changing material is phase-changed.

In the present invention, a hybrid having a multi-layered structure in which a structure for dispersing heat generated from an exothermic part, a structure for delaying the dispersed heat temporally, a structure for redistributing time delayed heat, and a structure for heat- There is an advantage that the heat insulating efficiency can be maximized by implementing the heat insulating sheet.

The present invention adopts a heat insulating sheet of a nanofiber web in which electrospun nanofibers are arranged in a three-dimensional network structure to improve heat insulation performance by using three-dimensional nano-sized micropores of a nanofiber web having a large heat collecting ability Technology can be provided.

In the present invention, the heat insulating sheet including the phase change material capable of delaying the heat conduction time is advantageously hybridized with the sheet capable of dispersing and insulating heat, thereby improving the heat blocking efficiency.

According to the present invention, heat dissipation, thermal delay, heat dispersion, and heat insulation can be performed successively, thereby providing excellent heat insulation performance and mounting to high-performance electronic products. At the same time, the thickness of the heat insulating sheet can be reduced, The present invention can be applied to electronic products including portable terminals.

1 is a schematic cross-sectional view of a hybrid thermal insulation sheet according to a first embodiment of the present invention,
2A to 2C are schematic cross-sectional views illustrating a method of manufacturing a hybrid thermal insulation sheet according to a first embodiment of the present invention,
3 is a conceptual sectional view for explaining a hybrid thermal insulation sheet according to a second embodiment of the present invention,
4A to 4D are schematic cross-sectional views illustrating a method of manufacturing a hybrid thermal insulation sheet according to a second embodiment of the present invention,
5 is a perspective view schematically showing a state in which a guide is fixed to a heat spreader according to a second embodiment of the present invention,
6A and 6B are conceptual sectional views illustrating a laminated structure of a nanofiber web and a nonwoven fabric applied as a heat insulating portion of a hybrid thermal insulation sheet according to first and second embodiments of the present invention,
7 is a schematic cross-sectional view showing an electrospinning apparatus for forming a nanofiber web applied to a hybrid thermal insulation sheet according to first and second embodiments of the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

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

The hybrid heat-insulating sheet of the present invention to be described later can be applied to a portable terminal, a refrigerator, and a building, but the present invention is not limited thereto and can be similarly applied to a heat insulation material used in other industrial fields.

The hybrid heat-insulating sheet of the present invention adopts a hybrid sheet structure composed of an ultra-thin structure capable of sequentially dispersing the heat transmitted from the heat-generating component, delaying the heat, dispersing the heat and insulating the heat sequentially, It is possible to improve the heat shield efficiency. Such a hybrid insulation sheet basically includes a heat spreader, a heat spread edge, an outer skin, and a heat insulating portion.

FIG. 1 is a schematic sectional view of a hybrid thermal insulation sheet according to a first embodiment of the present invention, and FIGS. 2A to 2C are schematic cross-sectional views illustrating a method of manufacturing a hybrid thermal insulation sheet according to a first embodiment of the present invention .

Referring to FIG. 1, a hybrid thermal insulation sheet according to a first embodiment of the present invention includes a heat spreader 110 for dispersing transmitted heat; A heat spread zone 120 for delaying and conducting the heat dispersed in the heat spreader 110 in time; An outer skin 130 that surrounds the heat spreader 120 and is fixed to the heat spreader 110; And a heat insulating part (140) for collecting and insulating the heat conducted from the outer skin (130).

In the hybrid heat-insulating sheet according to the first embodiment of the present invention, when heat is conducted from the heat-generating component to the heat spreader 110, the heat is dispersed in the heat spreader 110 and then transferred to the heat- The heat transferred to the heat spread zone 120 is delayed in time and is conducted to the outer skin 130. The heat transferred to the outer skin 130 is dispersed and transferred to the heat insulating part 140. In the heat insulating part 140, The heat is collected and the heat is blocked.

In other words, the hybrid thermal insulation sheet according to the first embodiment of the present invention disperses heat conducted in the heat spreader 110, conducts heat to the outer skin 130 by delaying the heat in the heat spread zone 120, The heat transferred from the heat exchanger 140 is collected and heat is cut off, thereby maximizing the heat insulation efficiency.

2A to 2C, a method of manufacturing a hybrid thermal insulation sheet according to a first embodiment of the present invention comprises the steps of preparing a heat spreader 110 for dispersing transmitted heat, The edge portions 120 are laminated (Fig. 2C). Next, the outer skin 130 is fixed to the heat spreader 110, and the heat insulating part 140 is laminated on the outer skin 130 (FIG. 2C ).

In the present invention, when fixing the outer skin 130 to the heat spreader 110, an adhesive may be used, but other fixing means may be used instead. The heat spreader 120 is positioned at the center of the heat spreader 110 and the outer skin 130 is fixed to the edge of the heat spreader 110 to heat the heat spreader 110 between the outer skin 130 and the heat spreader 110. [ The edge 120 is embedded.

The outer skin 130 prevents the phase change material, which is the heat paper edge 120, which has been phase-changed into liquid by the heat transmitted from the heat spreader 110, from leaking to the micropores of the heat insulating portion 140 or to the outside, (120) between the outer skin (130) and the heat spreader (110).

Therefore, in the hybrid heat-insulating sheet according to the first embodiment of the present invention, the heat-softening edge portion 120, which is a phase change material, is interposed between the outer skin 130 and the heat spreader 110, When the phase change material 120, which is the thermally supported portion 120, is phase-changed due to the endothermic reaction due to the transferred heat, it leaks to the outside or permeates into the micropores of the heat insulating portion 140 .

FIG. 3 is a conceptual sectional view for explaining a hybrid thermal insulation sheet according to a second embodiment of the present invention, and FIGS. 4A to 4D are schematic views for explaining a method of manufacturing a hybrid thermal insulation sheet according to a second embodiment of the present invention And FIG. 5 is a perspective view schematically showing a state in which the guide is fixed to the heat spreader according to the second embodiment of the present invention.

Referring to FIG. 3, a hybrid thermal insulation sheet according to a second embodiment of the present invention includes a heat spreader 110 for dispersing transmitted heat; A guide part 150 fixed to the heat spreader 110 and having at least one through hole 151 formed therein; A heat spreading edge portion 120 filled in the through hole 151 of the guide portion 150 for delaying and conducting heat dispersed in the heat spreader 110 in time; An outer skin 130 which surrounds the heat paper edge 120 and is fixed to the guide portion 150; And a heat insulating part (140) for collecting and insulating the heat conducted from the outer skin (130).

The hybrid thermal insulation sheet according to the second embodiment of the present invention is formed by filling the through hole 151 of the guide part 150 fixed to the heat spreader 110 with the phase change material as the heat release edge 120, The outer skin 130 surrounding the phase change material 120 as the phase change material is fixed to the guide portion 150 so that the outer skin 130 is prevented from leaking to the outside when the heat release edge portion 120, And it is possible to prevent penetration into the fine pores of the heat insulating portion 140. [

The heat transferred to the hybrid thermal insulation sheet according to the second embodiment of the present invention is also dispersed in the heat spreader 110, delayed in time at the thermo soft edge portion 120, dispersed in the outer skin 130, The heat insulating performance can be improved by having a structure in which heat is trapped and insulated from the heat insulating portion 140. [

Meanwhile, the guide part 150 may be made of the same material as the heat spreader 110 and may be made of a metal material different from that of the heat spreader 110. At this time, it is most preferable that the guide part 150 is made of the same material as the heat spreader 110. That is, the guide part 150 and the heat spreader 110 must have the same thermal expansion coefficient to prevent the interface between the guide part 150 and the heat spreader 110 from peeling off from the heat transmitted to the heat spreader 110 have.

5, the guide portion 150 is fixed to the heat spreader 110 so that the through-hole 151 of the guide portion 150 is shaped like a groove, The groove formed by the through hole 151 and the heat spreader 110 is filled with a phase change material which is a thermally punched edge 120.

4A to 4D, a method of manufacturing a hybrid thermal insulation sheet according to a second embodiment of the present invention includes a heat spreader 110 for dispersing heat transmitted through a guide portion (at least one through hole 151) 4A) and the open piercing hole 120 is filled in the through hole 151 of the guide part 150 (FIG. 4B). After the outer skin 130 is fixed to the guide unit 150 (FIG. 4C), the heat insulation unit 140 is laminated on the outer skin 130 (FIG. 4D).

As described above, the hybrid thermal insulation sheet according to the first and second embodiments of the present invention basically includes the heat spreader 110, the heat spreading edge 120, the outer skin 130, and the heat insulating portion 140.

The heat spreader 110 disperses heat transmitted from the outside. That is, the heat spreader 110 functions to dissipate heat by preventing the heat generated from the heat generating component from concentrating in one place. The heat spreader 110 is preferably made of a copper material or an aluminum material which has a high thermal conductivity and is inexpensive and performs nickel plating on the heat spreader 110 of the copper material in order to solve oxidation and corrosion problems . It is preferable that the thickness of the heat spreader 110 is 10 占 퐉 to 40 占 퐉.

The heat spreader 120 temporally delays the heat dissipated in the heat spreader 110 from being conducted to the heat insulating portion 140. It is preferable that the heat spreading edge portion 120 includes a phase change material (PCM). The phase change material absorbs the transmitted heat and delays heat conduction. That is, the phase-change material absorbs heat as it changes from a solid phase to a liquid phase by endothermic reaction when heat is transferred. And the phase change material changes back to a solid phase when the ambient temperature falls.

A method of manufacturing an example of the heat-softening edge 120 will be described. First, a phase-change material is powdered and then mixed with a phase change material powder, a binder, and a solvent to prepare a slurry in which powder of the phase- The slurry is made into a film to produce a film in which the powder of the phase change material is dispersed, and this is applied to the heat spread edge 120.

Another example of the method of manufacturing the thermally fringed portion 120 includes placing a heat spreader 110 on a hot plate and applying a powder of phase change material on the heat spreader 110 to change the temperature of the hot plate For example, when the heat spreader 110 is detached from the hot plate after making the phase change material powder into a liquid state at about 65 ° C, the phase change material becomes a film form. It is preferable that the thickness of the thermally fringed portion 120 is 10 占 퐉 to 30 占 퐉.

The outer skin 130 can be applied as a thin metal plate such as an aluminum foil to disperse the heat transmitted from the heat-

The heat insulating portion 140 collects the heat conducted in the heat spreading portion 120 to block heat. At this time, it is preferable that the heat insulating part 140 is integrated with a nanofiber and applied as a nanofiber web having a three-dimensional micropore structure. The thickness of the heat insulating portion 140 is preferably 10 占 퐉 to 30 占 퐉.

As described above, the hybrid thermal insulation sheet according to the first and second embodiments of the present invention can perform heat dispersion, heat delay, heat dispersion, and heat insulation sequentially, and thus is excellent in heat insulation performance and can be applied to a high performance portable terminal At the same time, the thickness can be reduced, which is advantageous in that it can be adopted in ultra-thin and ultra slim portable terminals.

In addition, nanofiber webs are randomly stacked with electrospun nanofibers arranged in a three-dimensional network structure. The nanofibers result in the formation of irregularly distributed three-dimensional micropores in the nanofiber web, and the ability of the nanofiber web to collect heat by the three-dimensional micropores, resulting in excellent thermal insulation performance.

Therefore, the hybrid thermal insulation sheet according to the first and second embodiments of the present invention is attached to a heat generating component and has a structure (heat spread) for dispersing heat generated from the heat generating component, a structure for delaying the dispersed heat temporally (Outer skin), and a structure (heat insulating portion) that catches heat and collects heat to form a laminated structure, thereby maximizing heat insulation efficiency.

In such a hybrid insulation sheet, heat generated from a hot spot is dispersed throughout the heat spreader 110 when a hotspot is intensively transferred to a local region of the heat spreader 110.

When the heat transmitted from the hot spot of the heat spreader 110 is filled in the heat spreader 110, the heat spreader 120 is transferred. Here, even if the heat spreader 110 is not filled with heat, heat is transmitted to the heat spread edge 120, which is close to the hot spot 111.

The piercing edge 120 delays the time that the transferred heat is transferred from the piercing edge 120 to the outer skin 130. That is, since the heat spread zone 120 includes a phase change material (PCM), the heat transmitted to the heat spread zone 120 is absorbed by the phase change material. At this time, since the phase-change material continuously absorbs heat for a predetermined time until the phase-change material completely changes from the solid phase to the liquid phase, it is possible to delay the time from the heat-softening edge portion 120 to the outer skin 130.

The heat transmitted from the outer skin 130 to the heat insulating portion 140 is collected and blocked by the heat insulating portion 140 formed of the nanofiber web. Dimensional micropores collect heat collected from the heat insulating part 140 to block heat.

As described above, the hybrid thermal insulation sheet according to the first and second embodiments of the present invention disperses the heat transmitted from the heat-generating component in the heat spreader 110, delays the heat in the heat- The outer skin 130 disperses heat and then transfers the heat to the heat insulating part 140. The heat insulating part 140 collects and blocks the heat.

The hybrid thermal insulation sheet according to the first and second embodiments of the present invention is designed so that the temperature of the heat conducted from the heat spreader 110 to the heat paper edge 120 is 2 ° C It is desirable to implement the hot edge 120 as a phase change material which is phase-changed at a low temperature of -5 占 폚.

On the other hand, a nanofiber web is produced by preparing a spinning solution by mixing a polymer material having a low thermal conductivity and a solvent at a certain ratio, spinning the spinning solution to form nanofiber, And is formed in the form of a nano web having pores.

As the diameter of the nanofibers is smaller, the specific surface area of the nanofibers is increased and the heat collecting ability of the nanofiber web having a plurality of micropores is increased, thereby improving the heat insulating performance.

The nanofibers have a diameter of, for example, 1 .mu.m or less, and the nanofibers made of nanofibers have a plurality of micropores having a three-dimensional structure, thereby trapping and trapping air in the micropores.

The micropores formed in the nano-web are preferably set to 4 nm to 1 μm or less, and may be implemented by controlling the diameter of the nanofibers.

Here, the spinning method applied to the present invention is a spinning method using general electrospinning, air-electrospinning (AES), electrospray, electrobrown spinning, centrifugal electrospinning, , And flash-electrospinning may be used.

For the purpose of improving the heat resistance of a nanofiber web of a hybrid thermal insulation sheet, a mixed polymer having a low thermal conductivity and excellent heat resistance, or a mixture of a polymer having a low thermal conductivity and a polymer having a high heat resistance, The obtained nano-web can be applied.

At this time, the polymer which can be used in the present invention is preferably dissolved in an organic solvent to be spinnable and low in thermal conductivity, and more preferably excellent in heat resistance.

Polymers that are capable of radiation and have low thermal conductivity include, for example, polyurethane (PU), polystyrene, polyvinyl chloride, cellulose acetate, polyvinylidene fluoride (PVDF), polyacrylonitrile , Polyvinyl acetate, polyvinyl alcohol, polyimide, and the like.

The polymer having excellent heat resistance is a resin which can be dissolved in an organic solvent for electrospinning and has a melting point of 180 ° C or higher. Examples of the resin include polyacrylonitrile (PAN), polyamide, polyimide, polyamideimide, poly Aromatic polyesters such as polyethylene terephthalate, polyethylene terephthalate, polyethylene terephthalate, and the like, polytetrafluoroethylene, polydiphenoxaphospazene, poly (ethylene terephthalate), poly Polyphosphazenes such as bis [2- (2-methoxyethoxy) phosphazene], polyurethane copolymers including polyurethane and polyether urethane, cellulose acetate, cellulose acetate butyrate, cellulose acetate propionate Etc. may be used.

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

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

In addition, the nano web can be manufactured to have various thicknesses by stacking the nano webs in multiple layers. That is, the heat insulating sheet of the nanofiber web applied to the present invention can have a high heat insulating performance while being manufactured in an ultra thin structure.

The solvent is selected from the group consisting of DMA (dimethyl acetamide), N, N-dimethylformamide, N-methyl-2-pyrrolidinone, DMSO, THF, DMAc, ethylene carbonate, DEC, dimethyl carbonate, ethyl methyl carbonate, propylene carbonate, water, acetic acid, and acetone. .

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

As described above, since the nanofibers are formed by the nanofiber web in which the nanofibers are accumulated by the spinning method, they can be formed into a plurality of pores without any additional process, and the size of the pores can be controlled according to the spinning amount of the spinning solution. Therefore, it is possible to finely form a large number of pores, so that the heat shielding performance is excellent and the heat insulating performance can be improved accordingly.

In the present invention, the spinning liquid for forming the nanofiber web may contain inorganic particles, which are heat insulating fillers for blocking heat transfer. In this case, the nanofibers of the nanofiber web may contain inorganic particles. The inorganic particles are located inside the radiated nanofiber, or are partially exposed to the surface of the nanofiber to block heat transfer. Further, the inorganic particles can improve the strength of the nanofiber web with 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 ₂ , or one or more particles selected from the group consisting of glass fibers, graphite, rock wool, and clay are preferable, but not always limited thereto, More than one species may be mixed and included in the spinning solution.

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

6A and 6B are conceptual cross-sectional views illustrating a laminated structure of a nanofiber web and a nonwoven fabric applied as a heat insulating portion of a hybrid thermal insulation sheet according to first and second embodiments of the present invention.

6A and 6B, the heat insulating portion 140 of the hybrid thermal insulation sheet according to the first and second embodiments of the present invention includes a laminated structure (FIG. 6A) of the nanofiber web 141 and the nonwoven fabric 142, Or a laminated structure of the nanofiber web 141 / nonwoven fabric 142 / nanofiber web 143 (FIG. 6B). At this time, it is preferable that the thickness t1 of the nanofiber web 141 is thinner than the thickness t2 of the nonwoven fabric 142.

If the heat insulating portion 140 is applied to the laminated structure of the nanofiber web 141 and the nonwoven fabric 142, the nonwoven fabric 142 is less expensive and has a higher strength than the nanofiber web 141, The manufacturing cost of the hybrid heat-insulating sheet can be reduced and the strength can be improved. In addition, the nonwoven fabric 142 also has a function of collecting heat due to the presence of a plurality of pores, thereby performing the role of the heat insulating portion.

The nano-fiber web 141 and the nonwoven fabric 142 can be fused due to the thermal compression bonding. By designing the melting point of the nano-fiber web 141 to be lower than the melting point of the nonwoven fabric 142, It is preferable that the nanofiber web 141 is melted and fused to the nonwoven fabric 142. For example, when the polymer material for forming the nanofiber web 141 is applied as PVdF, since the melting point of the PVdF is 155 ° C, the nonwoven fabric 142 is a polyester-based material having a melting point higher than 155 ° C, A nonwoven fabric 142 made of one of nylon series and cellulosic series is applied.

Therefore, at the time of thermocompression bonding, the region of the nanofiber web 141 contacting the nonwoven fabric 142 melts and is fused to the nonwoven fabric 142. Since the pore size of the nonwoven fabric 142 is much larger than the pore size of the nano-web 142, a part of the molten nano-fiber web 141 penetrates into the pores of the nonwoven fabric 142. That is, after the thermocompression bonding is performed with respect to the interface between the nonwoven fabric 142 before the thermocompression and the nano-fiber web 141, the nano-fiber web 141 ) Is spread and distributed. When the degree of melting of the nanofiber web 141 is controlled, the nanofiber web 141 is melted into the pores of the nonwoven fabric 142, and the nano- The adhesive force between the nano-fiber web 141 and the nonwoven fabric 142 can be improved by locking the fiber web 141.

In the present invention, a polymer substance in which PVdF and PAN are mixed in a ratio of 5: 5 can be applied as a polymer material forming a nano-web. At this time, the electrospun nanofibers are formed of a structure comprising a core made of PAN and an outer skin made of PVdF surrounding the core, and the nanofibers having such a structure are laminated to form a nanofiber web 141. When the nanofiber web 141 and the nonwoven fabric 142 laminated with the core and the outer skin structure are thermally compressed, the PVdF of the outer skin is melted and fused to the nonwoven fabric 142.

7 is a schematic cross-sectional view showing an electrospinning apparatus for forming a nanofiber web applied to a hybrid thermal insulation sheet according to first and second embodiments of the present invention.

7, the electrospinning device includes a mixer 2 incorporating a stirrer 2 using a pneumatic mixing motor 2a as a driving source so as to prevent phase separation until a polymer material having a low thermal conductivity is mixed with a solvent, A mixing tank 1, and a plurality of spinning nozzles 4 to which a high voltage generator is connected. The polymer solution discharged from the mixing tank 1 to the plurality of spinning nozzles 4 connected to the metering pump not shown through the transfer tube 3 is passed through the spinning nozzle 4 charged by the high voltage generator, 5, and the nanofibers 5 are accumulated on the grounded collector 6 in the form of a conveyor moving at a constant speed to form the porous nanofiber web 7.

Generally, when a multi-hole radiation pack (for example, 245 mm / 61 holes) is applied for mass production, mutual interference occurs between the multi-holes, so that the fibers are blown away and are not collected. As a result, the separation membrane obtained using a multi-hole spinning pack becomes too bulky, making it difficult to form a separation membrane and causing radiation trouble.

In view of this, in the present invention, as shown in FIG. 7, by using an air electrospinning method in which air 4a is jetted for each spinning nozzle 4 by using a multi-hole spinning pack, The web 7 is produced.

That is, according to the present invention, air is injected from the outer circumference of the spinning nozzle when electrospinning is performed by air electrospinning, and thus the fiber composed of a polymer having a high volatility plays a dominant role in collecting and accumulating air, Can produce this high nanofiber web and minimize the radiation problems that may occur as the fibers fly.

In the present invention, when a polymer material having a low thermal conductivity is mixed with a heat-resistant polymer material, the mixture is preferably added to a two-component solvent to prepare a mixed spinning solution.

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

In the present invention, if necessary, the porous nanofiber web 7 obtained as described above is allowed to remain 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 carry out a calendering process after a process of controlling the amount of solvent and moisture.

The Pre-Air Dry Zone by the preheater 8 is a method in which air of 20 to 40 ° C is applied to the web by using a fan to remove the solvent remaining on the surface of the nanofiber web 7 By regulating the amount of water, the nanofiber web 7 can be controlled to be bulky, thereby increasing the strength of the separator and controlling the porosity.

In this case, when calendering is performed while the solvent is excessively volatilized, the porosity is increased but the strength of the nanofiber web is weakened. On the other hand, when the volatilization of the solvent is low, the nanofiber web is melted.

The method of forming the porous nanofiber web 10 using the electrospinning apparatus of FIG. 7 is such that a polymer material having a low thermal conductivity is first solved, a mixture of a polymer material having a low thermal conductivity and a heat resistant polymer material is dissolved in a solvent, Prepare. In this case, a predetermined amount of inorganic particles may be added to the spinning solution to reinforce the heat resistance, if necessary. In addition, when a nanofiber web is formed using a polymer material having a low thermal conductivity and an excellent heat resistance, for example, polyurethane (PU), the heat insulating property and the heat resistance property are simultaneously obtained.

Thereafter, the spinning solution is directly radiated to the collector 6 using an electrospinning device or is radiated to a porous substrate 11 such as a nonwoven fabric to form a single-layer porous nanofiber web 10 or a porous nanofiber web 10, And a porous substrate (11).

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 manufacturing a nanofiber web sheet having a large area, It is also possible to use it.

In the case of a heat insulating material for a building or a refrigerator, if the obtained nanofiber web sheet is wide in width, it can be cut to a desired width and then folded in a plate shape to have a desired thickness or wound in a plate shape by a winding machine, After the core sheet is cut, a plurality of layers are laminated. In addition, after laminating in multiple layers, it can be cut into a desired shape. If necessary, a plurality of laminated nanofiber web sheets can be hot-pressed or cold-pressed to increase the lamination density.

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

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the embodiments set forth herein. Various changes and modifications may be made by those skilled in the art.

110: Heat spreader 120: Heat spread edge
130: outer skin 140:
141, 143: Nano fiber web 142: Nonwoven fabric
150: guide part 151: through hole

Claims (11)

A heat spreader for dispersing the transmitted heat;
A heat spread edge which conducts the heat dispersed in the heat spreader with a time delay;
An outer skin that surrounds the heat paper edge and is fixed to the heat spreader; And
And a heat insulating portion for collecting and insulating the heat conducted from the outer skin. The hybrid thermal insulation sheet according to claim 1, wherein the outer skin is a metal thin plate. The hybrid thermal insulation sheet according to claim 1, wherein the heat-softening edge portion comprises a phase change material (PCM). 4. The hybrid thermal insulation sheet according to claim 3, wherein the phase change material is phase-changed at a temperature of 2 DEG C to 5 DEG C lower than the temperature of heat conducted from the heat spreader to the heat paper edge. The hybrid thermal insulation sheet according to claim 1, wherein the heat insulating portion is a nanofiber web integrated with a nanofiber and having a three-dimensional micropore structure. The hybrid thermal insulation sheet according to claim 1, wherein the heat insulating portion is a laminated structure of a nanofiber web and a nonwoven fabric, or a structure in which a nanofiber web, a nonwoven fabric and a nanofiber web are sequentially laminated. A heat spreader for dispersing the transmitted heat;
A guide portion fixed to the heat spreader and having at least one through hole;
A heat spread edge portion which is filled in the through hole of the guide portion and which conducts the heat dispersed in the heat spreader with a time delay;
An outer skin surrounding the heating edge and fixed to the guide; And
And a heat insulating portion for collecting and insulating the heat conducted from the outer skin. The hybrid thermal insulation sheet according to claim 7, wherein the guide portion is made of the same material as the heat spreader. Stacking a heat spreader on a heat spreader that disperses the transmitted heat;
Fixing the outer skin to the heat spreader so as to surround the heat paper edge; And
And laminating the heat insulating portion on the outer skin. 10. The method of claim 9,
The heat-
Fabrication of a hybrid insulation sheet, which is one of a laminated structure of a nanofiber web, a nanofiber web and a nonwoven fabric having a three-dimensional microporous structure integrated by a nanofiber, or a structure in which a nanofiber web, a nonwoven fabric and a nanofiber web are sequentially laminated Way. 10. The method of claim 9,
Wherein the outer skin is a thin metal plate.

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