KR20160024352A - Heat insulation sheet using porous substrate - Google Patents

Heat insulation sheet using porous substrate Download PDF

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Publication number
KR20160024352A
KR20160024352A KR1020150117430A KR20150117430A KR20160024352A KR 20160024352 A KR20160024352 A KR 20160024352A KR 1020150117430 A KR1020150117430 A KR 1020150117430A KR 20150117430 A KR20150117430 A KR 20150117430A KR 20160024352 A KR20160024352 A KR 20160024352A
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KR
South Korea
Prior art keywords
porous substrate
heat
nanofiber web
pores
nanofiber
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KR1020150117430A
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Korean (ko)
Inventor
황승재
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주식회사 아모그린텍
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Publication of KR20160024352A publication Critical patent/KR20160024352A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B32B5/20—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material foamed in situ
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/02—Cellular or porous
    • B32B2305/026—Porous

Abstract

The present invention relates to a heat insulation sheet using a porous substrate. The heat insulation sheet comprises: a porous substrate equipped with a plurality of pores; and a nanofiber web laminated on one side or both sides of the porous substrate, and formed by electrospinning a polymer substance. The heat insulation sheet is capable of improving heat insulation properties, reducing production costs, and having excellent handling properties.

Description

TECHNICAL FIELD [0001] The present invention relates to a heat insulating sheet using a porous substrate,

The present invention relates to a heat insulating sheet, and more particularly, to a heat insulating sheet using a porous substrate formed by laminating a nanofiber web on a porous substrate.

Background Art [0002] With the recent increase in use of electronic devices, miniaturization, light weight, and high performance of devices have been progressing radically.

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. As a result, the components used in the portable terminal have higher performance and higher heat generation temperature, and the increased heat temperature affects the adjacent components, thereby deteriorating the performance of the portable terminal.

The heat generated during the operation of the passenger device not only causes deterioration of the internal parts as described above but also causes the heat of the electronic device to be transmitted to the outside to cause the user's discomfort or even the user to be exposed to a low temperature .

Accordingly, it is necessary to dissipate the heat generated from the heat generating component of the electronic device to dissipate heat and to prevent the external transmission of the heat to maintain the temperature of the electronic device case at a predetermined temperature or less. In the specification.

On the other hand, heat dissipation and thermal insulation of the above-described electronic devices are very effective when the thickness of the heat dissipating member and / or the heat insulating member is increased. However, in recent trends of electronic equipment which is thin and thin, the adoption of thick heat dissipating and / It is impossible.

Therefore, it is urgent to develop a heat-insulating sheet capable of suppressing external transfer of heat generated in a heat generating component of an electronic device while having a very thin thickness.

Korean Patent Laid-Open Publication No. 2014-0078338

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a heat insulating sheet using a porous substrate that maintains excellent heat insulating performance by using a nanofiber web having a plurality of micropores produced by electrospinning, .

Another object of the present invention is to provide a heat insulating sheet using a porous substrate which is excellent in manufacturing cost reduction and handling property and can further improve the heat insulating performance by laminating a nanofiber web on a porous substrate such as a nonwoven fabric.

According to an aspect of the present invention, there is provided a heat insulating sheet using a porous substrate, comprising: a porous substrate having a plurality of pores; And a nanofiber web laminated on one or both surfaces of the porous substrate and formed by electrospinning a polymeric material.

According to one embodiment of the present invention, the porous substrate may be a nonwoven fabric of any one of polyester series, nylon series, polyolefin series and cellulosic series.

In addition, the nanofiber web may have a structure in which a plurality of micropores are formed by accumulation of nanofibers into which a polymer material is electrospun, or a nanofiber web in which the plurality of pores are formed may be calendered at a temperature lower than the melting point of the polymer material Or an inorganic ball state structure obtained by heat treatment.

Here, the pore size of the porous substrate may be larger than the pore size of the nanofiber web.

The diameter of the nanofibers may be less than or equal to 1 um.

In addition, the thermal conductivity of the polymer material may be less than 0.1 W / mK.

In addition, the thickness of the nanofiber web may be less than the thickness of the porous substrate.

The porous substrate and the nanofiber web may be adhered to each other by thermal fusion or an adhesive.

The adhesive may be one of acrylic, epoxy, urethane, polyamide, polyethylene, EVA, polyester, and PVC, or a thermally adherable fiber. And may be a hot melt adhesive sheet in a web state or an inorganic ball state having a plurality of pores.

On the other hand, the adhesive may include an insulating filler such as an airgel.

As described above, according to the present invention, the nanofiber web is laminated on one side or both sides of the porous substrate, and the convection of the air trapped in the pores of the porous substrate and the nanofiber web is not smooth, Can be improved.

According to the present invention, a heat-insulating sheet having an ultra-thin structure made of a nanofiber web laminated on both sides of a porous substrate can be realized, the manufacturing cost can be reduced, and the handling property can be improved.

1A and 1B are sectional views of a heat insulating sheet using a porous substrate according to a first embodiment of the present invention,
2 is a conceptual sectional view for explaining a state where fine pores are formed in a heat insulating sheet using a porous substrate according to a first embodiment of the present invention;
3 is a view for explaining a nanofiber web applied to a heat insulating sheet according to a first embodiment of the present invention,
4 is a sectional view of a heat insulating sheet according to a second embodiment of the present invention,
5 is a sectional view of a heat insulating sheet according to a third embodiment of the present invention,
6 is a cross-sectional view of a heat insulating sheet according to a fourth embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1A and 1B, a heat insulating sheet using a porous substrate according to a first embodiment of the present invention includes a porous substrate 110 having a plurality of pores; And nanofiber webs 120 and 130 laminated on one or both surfaces of the porous substrate 110 and formed by electrospinning a polymeric material.

In the heat insulating sheet using the porous substrate according to the first embodiment of the present invention, the nanofiber webs 120 and 130 surround one or both surfaces of the porous substrate 110, and the porous substrate 110 A part or all of a plurality of pores existing in a region of the porous substrate 110 is closed to make the pores of the porous substrate 110 a closed pore, thereby suppressing the convection of the trapped air, .

The nanofiber webs 120 and 130 may have a structure in which nanofibers having electrospun nanofibers mixed with a polymer material and a solvent are accumulated to form a plurality of pores or a nanofiber web having a plurality of pores is formed at a temperature lower than the melting point of the polymer material Or may be an inorganic ball structure obtained by calendering or heat treatment.

Since the one or both surfaces of the porous substrate 110 are wrapped by the nanofiber webs 120 and 130, the air trapped in the pores of the porous substrate 110 is not smoothly convected, and the heat transmitted to the heat- .

At this time, it is preferable that the size of the pores of the porous substrate 110 is larger than the size of the pores of the nanofiber webs 120 and 130.

As described above, when the nanofiber webs 120 and 130 are inorganic porous structures, when the nanofiber webs 120 and 130 are laminated on one or both surfaces of the porous substrate 110, the porous substrate 110, which is in contact with the nanofiber webs 120 and 130, All of the plurality of pores existing in the region are closed, and convection of air is suppressed, so that the heat insulating property is obtained.

Even when the nanofiber webs 120 and 130 have a pore structure, the pore size of the nanofiber webs 120 and 130 is smaller than the pore size of the porous substrate 110, and the pore size of the porous substrate 110, which is in contact with the nanofiber webs 120 and 130, A part of the existing pores may be closed to have an adiabatic characteristic.

In addition, in the present invention, an air barrier layer is formed by accumulating liquid droplets obtained by spraying a liquid mixture of a polymer material and a solvent onto a porous substrate so that a large number of pores of the porous substrate have excellent heat insulating properties. It is possible.

Here, an air-blocking layer may be formed on one side or both sides of the porous substrate, and the air-blocking layer may accumulate droplets to be inorganic porous, blocking external air from entering and leaving the pores of the porous substrate, The convection of the air trapped in the pores is suppressed to provide the heat insulating property.

At this time, the droplet may penetrate into a plurality of pores of the porous substrate to reduce a size of a plurality of pores of the porous substrate to have a size substantially similar to a size of pores of the nanofiber web, It is possible to realize a heat insulating sheet with low manufacturing cost.

2, when the nanofibrous webs 120 and 130 having the plurality of pores 121 and 131 formed thereon are laminated on the porous substrate 110, a part of the pores 111 of the porous substrate 110 may be formed on the nanofiber web 110 120 and 130 to become a closed pore, and convection of the air trapped in the pores 111 is suppressed.

When a nanofiber web (not shown) in an inorganic ball state is laminated on the porous substrate 110, all of the pores 111 of the porous substrate 110 are blocked by the nanofiber web in the inorganic state, The heat insulating performance of the heat insulating sheet of the present invention can be further enhanced.

In other words, although air is generally known as an excellent heat insulating material having low thermal conductivity, it can not be used as a heat insulating material by convection or the like. However, in the heat insulating sheet according to the present invention, convection of the air trapped in the pores 111, 121, 131 of the porous substrate 110 and the nanofiber webs 120, 130 is not smooth and air is trapped in the pores 111, 121, 131, It is possible to obtain an excellent heat insulating property.

Therefore, the heat insulating sheet using the porous substrate according to the first embodiment of the present invention can improve the heat insulating performance with the ultra-thin structure made of the nanofiber web laminated on both sides of the porous substrate.

In the present invention, the thicknesses t1 and t2 of the nanofiber webs 120 and 130 are made thinner than the thickness t3 of the porous substrate 110 so that a small amount of the expensive nanofiber webs 120 and 130 are used in the heat- By using relatively much less expensive porous substrate 110, it is possible to drastically reduce manufacturing cost.

In addition, the heat-insulating sheet of the present invention can soften the nanofibrous webs 120 and 130 on the porous base material 110 having excellent strength to improve handling properties.

In the present invention, the porous substrate 110 may be a nonwoven fabric of any one of polyester series, nylon series, polyolefin series and cellulosic series.

Here, the usable nonwoven fabric may be any one of a melt-blown nonwoven fabric, a spun bond nonwoven fabric, a thermal bond nonwoven fabric, a chemical bond nonwoven fabric, and a wet-laid nonwoven fabric Can be used. The nonwoven fabric may have a fiber diameter of 30 to 60 mu m and a pore size of about 50 to 200 mu m.

The nonwoven fabric may be a commercially available two- or three-layered polyolefin-based porous membrane, for example, a PP or PE membrane or a PP / PE / PP membrane or a monolayer PP or PE membrane, It is also possible to use a PET nonwoven fabric made of polyethylene terephthalate (PET) fiber, or a nonwoven fabric made of PP / PE fibers having a double structure coated with PET.

The porous substrate 110 serves as a supporting layer for supporting the first and second nanofiber webs 120 and 130 to maintain a plate shape.

The first and second nanofiber webs 120 and 130 are formed in the form of a nanofiber web having a plurality of micropores in which nanofibers are accumulated by an electrospinning method.

3 is a view for explaining a nanofiber web applied to a heat insulating sheet according to a first embodiment of the present invention.

Referring to FIG. 3, the nanofiber web applied to the heat insulating sheet of the present invention is prepared by mixing an electrospun polymer material and a solvent at a predetermined ratio to prepare a spinning solution. When the spinning solution is spinned by electrospinning, And the nanofibers 122 are accumulated to form a web in which a plurality of pores 121 are formed.

In such a nanofiber web, electrospun nanofibers 122 are irregularly stacked and arranged in a three-dimensional network structure. The nanofibers 122 form irregularly distributed fine pores 121 in the nanofiber web, and the nanofiber web also has a heat shielding ability by the fine pores 121.

As the diameter of the nanofibers 122 is smaller, the specific surface area of the nanofibers 122 is increased and the heat shielding ability of the nanofibrous web having a plurality of micropores 121 is increased, thereby improving the heat insulating performance.

The nanofibers 122 are made of, for example, a diameter of 5 μm or less, preferably 1 μm or less. The nanofiber web 122 made of nanofibers 122 has a number of micropores 121, And the air trapped in the fine pores 121 to restrict the convection of the entrapped air is excellent in the ability to block transmitted heat.

The fine pores 121 formed in the nanofiber web are preferably set to a few nm to 10 μm, preferably 5 μm or less, and the diameter of the nanofibers 122 may be controlled.

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.

In the present invention, for the purpose of improving the heat resistance of a nanofiber web of a heat insulating sheet, a polymer material having a low thermal conductivity and excellent heat resistance, or a mixed polymer material obtained by mixing a predetermined amount of a polymer material having a low thermal conductivity and a polymer having a high heat resistance A nanofiber web obtained by electrospinning can be applied.

At this time, the polymeric material usable in the present invention is preferably dissolved in an organic solvent to allow spinning and low 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 material is preferably set to less than 0.1 W / mK.

Among the above polymer materials, 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 a nanofiber web obtained by spinning the polystyrene and polyvinyl chloride has a low thermal conductivity do.

The thickness of the nanofiber web may be set to be between 5 袖 m and 50 袖 m, preferably between 10 袖 m and 30 袖 m.

Further, the nanofiber web may be laminated in multiple layers to have various thicknesses. 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 nanofiber web of 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.

4 is a sectional view of a heat insulating sheet according to a second embodiment of the present invention, FIG. 5 is a sectional view of a heat insulating sheet according to a third embodiment of the present invention, FIG. 6 is a cross- Fig.

In the present invention, a thermal fusion process or an adhesion process can be applied as a method of making the porous substrate 110 and the nanofiber webs 120 and 130 complex.

For example, when the porous substrate 110 is applied as a nonwoven fabric, the nanofibrous webs 120 and 130 are laminated on one or both sides of the nonwoven fabric, heated to a temperature lower than the melting point of the nonwoven fabric and higher than the melting point of the nanofiber webs 120 and 130, The fibrous webs 120 and 130 are thermally welded to each other to produce a heat insulating sheet.

In this way, in the heat-sealable heat insulating sheet structure, a structure in which 1/5 to 1/2 thickness portions of the nanofiber webs 120 and 130 penetrate and adhere to the nonwoven fabric may be used.

4, the heat insulating sheet according to the second embodiment of the present invention is manufactured by adhering the nanofiber webs 120 and 130 to the end face or the both faces of the porous substrate 110 with the adhesives 151 and 152, .

The adhesive 151 or 152 may be one of acrylic, epoxy, urethane, polyamide, polyethylene, EVA, polyester, and PVC, May be a hot melt adhesive sheet in a web state or an inorganic ball state having a plurality of pores.

The present invention may further include at least one reinforcing sheet 150 laminated on one or both sides of the heat insulating sheet.

That is, in the structure of FIG. 1B in which the nanofiber web 120 is laminated on one side of the porous substrate 110, the reinforcing sheet 150 may be laminated on the porous substrate 110 or the nanofiber web 120.

5, the heat insulating sheet according to the third embodiment of the present invention has a structure in which the nanofiber webs 120 and 130 are laminated on both surfaces of the porous substrate 110, As shown in Fig.

Here, the reinforcing sheet 150 may be a heat insulating member or a heat dissipating member, and the heat insulating sheet and the reinforcing sheet may be adhered to each other with an adhesive interposed between the heat insulating sheet and the reinforcing sheet 150.

The heat radiating member preferably includes a thin plate sheet made of a metal or a non-metal having a thermal conductivity of 200 W / mK or more, and the thin plate sheet may be any one of a graphite sheet, a Cu thin film, an Al thin film and an Ag thin film or a laminated structure thereof .

6, the heat insulating sheet according to the fourth embodiment of the present invention is a heat insulating sheet structure in which a nanofiber web 120 is laminated on one surface of a porous substrate 110, heat is applied to the other surface of the porous substrate 110 A heat insulating adhesive film in which the insulating filler to be shielded is dispersed, or a heat radiating adhesive film 131 in which the heat conductive filler is dispersed is further formed.

The heat insulating filler of the heat insulating adhesive film is preferably made of an airgel having excellent heat insulating properties, but is not limited thereto.

For example, when the heat insulating filler of a plate-like type is arranged in the horizontal direction of the heat insulating adhesive film, the size of the heat insulating filler in the vertical direction of the heat insulating adhesive film The blocking efficiency of the transmitted heat can be increased.

The thermally conductive filler of the heat dissipating adhesive film 131 is composed of a first thermally conductive filler for horizontally diffusing the heat generated from the exothermic component and a second thermally conductive filler for transferring heat generated from the exothermic component to the first thermally conductive filler . ≪ / RTI >

Here, the first and second thermally conductive fillers are dispersed in the heat-sealable adhesive layer 131 to promote diffusion of the heat of the heat-generating components in the horizontal direction, The temperature of the heat transmitted in the vertical direction can be lowered.

The second thermally conductive filler can be located in the region of the heat dissipation adhesive film 131 where the first thermally conductive filler is absent and transfers the heat of the exothermic component to the first thermally conductive filler to change the heat path.

The first thermally conductive filler preferably has a plate-like structure (or a rectangular structure) so as to diffuse in the horizontal direction of the heat dissipating adhesive film 131. The first thermally conductive filler may be a graphite nano fiber (GNF), a carbon nanotube (CNT) And may be made of at least one of AlN (Aluminum nitride) and BN (Boron nitride). The first thermally conductive filler is preferably formed in a shape having an aspect ratio of 1: 100.

The second thermally conductive filler may have a spherical structure to transfer heat to the first thermally conductive filler. At this time, the second thermally conductive filler receives the heat transferred from the heat-generating component and diffuses the heat to the spherical surface, 131 to change the path of the heat transmitted in the vertical direction to quickly transfer heat to the first thermally conductive filler. The second thermally conductive filler is preferably made of at least one of MgO, Al 2 O 3 , SiC, and diamond.

Here, the first thermally conductive filler may be arranged on a plurality of layers having vertically spaced layers of the heat-sealable adhesive film 131, and the second thermally conductive filler may be positioned between the layers of the first thermally conductive filler .

The first and second thermally conductive fillers may be made of a material having a thermal conductivity of about 200 to 3000 W / mk.

It is preferable that the first and second thermally conductive fillers contain 5 to 15 wt% of the total weight of the heat dissipating adhesive film 131. When the heat dissipating adhesive film 131 contains the first and second thermally conductive fillers of 5 wt% or less, a desired level of heat radiation efficiency can not be obtained. If the heat-insulating adhesive film 131 contains the first and second thermally conductive fillers of 15 wt% There is a drawback that the performance is deteriorated.

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.

The present invention is applied to a heat insulating sheet capable of realizing an ultra-thin insulating sheet in which a nanofiber web is laminated on a porous substrate, and capable of improving the heat insulating ability while reducing manufacturing costs.

Claims (10)

A porous substrate having a plurality of pores; And
And a nanofiber web laminated on one side or both sides of the porous substrate and formed by electrospinning a polymer material. The method according to claim 1,
Wherein the porous substrate is a nonwoven fabric of any one of polyester series, nylon series, polyolefin series and cellulosic series. The method according to claim 1,
The nanofiber web may have a structure in which a plurality of micropores are formed by accumulating nanofibers in which a polymer material is electrospun or a nanofiber web in which the plurality of pores are formed is calendered at a temperature lower than the melting point of the polymer material, A heat-insulating sheet using a porous substrate having an inorganic-inorganic structure obtained by heat treatment. The method of claim 3,
Wherein the pore size of the porous substrate is larger than the pore size of the nanofiber web. The method of claim 3,
Wherein the diameter of the nanofiber is 1um or less. The method of claim 3, wherein
Wherein the polymer material has a thermal conductivity of less than 0.1 W / mK. The method of claim 1, wherein
Wherein the thickness of the nanofiber web is thinner than the thickness of the porous substrate. The method of claim 1, wherein
Wherein the porous substrate and the nanofiber web are bonded to each other by thermal fusion or an adhesive. The method of claim 8, wherein
The adhesive may be one of acrylic, epoxy, urethane, polyamide, polyethylene, EVA, polyester, and PVC, or a thermally adherable fiber. Wherein the porous sheet is a hot melt adhesive sheet in a web state or an inorganic ball state having a plurality of pores. 10. The method of claim 9,
Wherein the adhesive comprises an insulating filler.















KR1020150117430A 2014-08-21 2015-08-20 Heat insulation sheet using porous substrate KR20160024352A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102118977B1 (en) * 2019-01-03 2020-06-05 주식회사 나노플랜 Manufacturing method of functional nanofiber fabric
KR20200084812A (en) * 2020-02-25 2020-07-13 주식회사 나노플랜 Functional nanofiber fabric and its manufacturing apparatus
WO2023224405A1 (en) * 2022-05-18 2023-11-23 주식회사 아모그린텍 Composite sound-absorbing material

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140078338A (en) 2012-12-17 2014-06-25 김연세 High-efficiency insulation sheet

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140078338A (en) 2012-12-17 2014-06-25 김연세 High-efficiency insulation sheet

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102118977B1 (en) * 2019-01-03 2020-06-05 주식회사 나노플랜 Manufacturing method of functional nanofiber fabric
KR20200084812A (en) * 2020-02-25 2020-07-13 주식회사 나노플랜 Functional nanofiber fabric and its manufacturing apparatus
WO2023224405A1 (en) * 2022-05-18 2023-11-23 주식회사 아모그린텍 Composite sound-absorbing material

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