CN115771318A - Vacuum heat insulating material and method for producing same - Google Patents

Vacuum heat insulating material and method for producing same Download PDF

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Publication number
CN115771318A
CN115771318A CN202211099802.3A CN202211099802A CN115771318A CN 115771318 A CN115771318 A CN 115771318A CN 202211099802 A CN202211099802 A CN 202211099802A CN 115771318 A CN115771318 A CN 115771318A
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China
Prior art keywords
vacuum insulation
insulation material
glass fiber
sheets
vacuum
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CN202211099802.3A
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Chinese (zh)
Inventor
韩精弼
林东圭
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Ace Global Ltd
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Ace Global Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/06—Arrangements using an air layer or vacuum
    • F16L59/065—Arrangements using an air layer or vacuum using vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • 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
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/02—Layered products essentially comprising sheet glass, or glass, slag, or like fibres in the form of fibres or filaments
    • 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
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • 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
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/08—Interconnection of layers by mechanical means
    • B32B7/09—Interconnection of layers by mechanical means by stitching, needling or sewing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials

Abstract

The invention discloses a vacuum heat-insulating material and a preparation method thereof. The disclosed vacuum insulation material may include: a skin material for forming an inner space; a core material filled in the inner space of the outer skin material; and an adsorbent disposed in the inner space of the outer skin material together with the core material, wherein the core material may have a multilayer structure in which a plurality of sheets are laminated, the sheets may include glass fibers (glass fibers), respectively, the multilayer structure may include 10 or more sheets, and the inner space of the outer skin material in which the core material and the adsorbent are disposed may be in a vacuum state. In each of the above monoliths, the glass fiber may have a weight per unit area of less than 100g/m 2 . In each of the above monoliths, the glass fiber may have a weight per unit area of about 50g/m 2 ～70g/m 2 . The glass fibers may have an average diameter of about 13 μm or less.

Description

Vacuum heat insulating material and method for producing same
Technical Field
The present invention relates to a thermal insulation material and a method for manufacturing the same, and more particularly, to a vacuum thermal insulation material and a method for manufacturing the same.
Background
With the increasing demand for energy conservation and environmental protection worldwide, regulations and regulations relating thereto are becoming more stringent. Therefore, it is required to improve the heat insulation performance in order to reduce heat loss of various products, structures, or buildings related to energy saving and the like.
In the conventional heat insulating material, it is necessary to increase the thickness thereof in order to improve the heat insulating performance, and in this case, the thickness of the heat insulating layer of the product or the structure is increased, which causes a problem in terms of space efficiency and the like. For example, a conventional thermal insulator such as polyurethane (polyurethane) has a thermal conductivity of about 20 mW/(m · K), and when it is used, the thickness of the outer wall of the refrigerator increases, which leads to a reduction in storage capacity, that is, a reduction in internal volume. Therefore, in order to solve the problems as described above, it is necessary to use a high efficiency heat insulating material capable of exhibiting excellent heat insulating performance with a relatively thin thickness.
The vacuum insulation material, which is a high efficiency insulation material, can realize excellent insulation performance with a relatively thin thickness by minimizing the convection effect of air in a vacuum state. The vacuum insulation material is excellent in thermal insulation performance about 5 to 10 times as compared to the conventional insulation material, and can reduce energy by about 20 to 30% when applied to home appliances and can reduce energy by 50% or more at most when applied to buildings, although the effect thereof can be varied according to the application area and the application place. In addition, the heat insulating layer can be reduced in thickness due to high efficiency in addition to the reduction in energy, and therefore, there is an advantage in that the use space is increased.
Recently, as energy standards of various countries become more stringent, the demand for improvement in performance of vacuum insulation materials is increasing. Therefore, research and development for further improving the thermal insulation performance by reducing the initial thermal conductivity of the vacuum insulation material to a predetermined level of about 1.5mW/mk or less have been carried out. In addition, a vacuum insulation material and a process for manufacturing the same are required, which can reduce the manufacturing cost of the vacuum insulation material and can easily adjust the thickness according to the application.
Disclosure of Invention
Technical problem
The present invention aims to provide a vacuum heat insulating material having a low thermal conductivity of a predetermined level or less and excellent heat insulating performance, and a method for manufacturing the same.
Further, another object of the present invention is to provide a vacuum insulation material and a method for manufacturing the same, which can simplify the manufacturing process and reduce the manufacturing cost, and in which the thickness can be easily adjusted according to the application.
The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned will be clearly understood by those skilled in the art to which the present invention pertains from the following contents.
Technical scheme
In order to achieve the above object, an embodiment of the present invention provides a vacuum insulation material including: a skin material for forming an inner space; a core material filled in the inner space of the outer skin material; and an adsorbent disposed in the inner space of the outer skin material together with the core material, wherein the core material has a multilayer structure in which a plurality of single sheets each including glass fibers (glass fibers) are laminated, the multilayer structure includes 10 or more single sheets, and the inner space of the outer skin material in which the core material and the adsorbent are disposed is in a vacuum state.
In each of the above monoliths, the glass fiber may have a weight per unit area of less than 100g/m 2 。
In each of the above monoliths, the glass fiber may have a weight per unit area of about 10g/m 2 ～70g/m 2 。
The glass fibers may have an average diameter of about 13 μm or less.
The glass fiber may have an average diameter of about 6 μm or more.
The average length of the glass fiber may be about 1mm to 50mm.
The thickness of the single sheet may be about 5mm or less.
The vacuum insulation material may have a thermal conductivity of about 1.5 mW/(m.K) or less.
The sheath material may include a multi-film structure, and the multi-film structure may include a linear low density polyethylene (L-LDPE) layer or a cast polypropylene (CPP) layer/an aluminum layer or a vacuum metalized ethylene vinyl alcohol copolymer (VM-EVOH) layer/a nylon layer and a vacuum metalized polyethylene terephthalate (VM-PET) layer, which are sequentially stacked.
The adsorbent may include a moisture absorbent (getter) and a gas getter (gas getter).
A method for manufacturing a vacuum insulation material according to still another embodiment of the present invention includes the steps of: preparing a sheath material, a core material and an adsorbent material for forming an internal space, respectively; disposing the core material and the adsorbent in an inner space of the outer cover material; and a step of preparing the core material by forming an inner space of the outer skin material in which the core material and the adsorbent are arranged in a vacuum state, the step including: forming a plurality of monolithic sheets comprising glass fibers (glass fibers); and laminating the plurality of single sheets and forming a multilayer structure by press-fitting, the multilayer structure including 10 or more of the single sheets.
The step of forming the multilayer structure may include a step of performing a thermocompression bonding process on a laminate formed by laminating the plurality of individual sheets.
The step of forming the above-described multilayer structure may include the steps of: performing a needling (needling) process on a laminate formed by laminating the plurality of single sheets; and performing a thermocompression bonding process on the laminate.
The needling (needling) process may be performed from one surface of the laminate to a partial thickness of the laminate.
In each of the above monoliths, the glass fiber may have a weight per unit area of less than 100g/m 2 。
In each of the above monoliths, the glass fiber may have a weight per unit area of about 50g/m 2 ～70g/m 2 。
The glass fibers may have an average diameter of about 13 μm or less.
The glass fibers may have an average length of about 1mm to 50mm.
In the vacuum insulation material, the thickness of the single sheet may be about 5mm or less.
The vacuum insulation material may have a thermal conductivity of about 1.5 mW/(mK) or less.
Another embodiment of the present invention provides a vacuum insulation material including:a skin material for forming an inner space; a core material filled in the inner space of the outer skin material; and an adsorbent disposed in the inner space of the outer cover together with the core material, wherein the core material has a multilayer structure in which a plurality of single sheets are laminated, each of the single sheets includes glass fibers (Na) containing sodium oxide (Na) 2 O), the total content of the sodium oxide in the glass fiber is 0.3 wt% or less, and an inner space of the sheath material in which the core material and the adsorbent are disposed is in a vacuum state.
The above multilayer structure may comprise more than 10 of the above single sheets.
In each of the above monoliths, the glass fiber may have a weight per unit area of less than 100g/m 2 。
In each of the above monoliths, the glass fiber may have a weight per unit area of about 50g/m 2 ～70g/m 2 。
The glass fibers may have an average diameter of about 13 μm or less.
The glass fibers may have an average diameter of about 6 μm or less.
The average length of the glass fiber may be about 1mm to 50mm.
The thickness of the single sheet may be about 5mm or less.
The vacuum insulation material may have a thermal conductivity of about 1.5 mW/(mK) or less.
The sheath material may include a multi-film structure, and the multi-film structure may include a linear low density polyethylene (L-LDPE) layer or a cast polypropylene (CPP) layer/an aluminum layer or a vacuum metalized ethylene vinyl alcohol copolymer (VM-EVOH) layer/a nylon layer and a vacuum metalized polyethylene terephthalate (VM-PET) layer, which are sequentially stacked.
The adsorbent may include a moisture absorbent (moisture absorbent) and a gas getter (gas absorbent).
ADVANTAGEOUS EFFECTS OF INVENTION
The vacuum heat insulating material of the embodiment of the invention not only has low heat conductivity below a specified level, but also has excellent heat insulating performance. For example, the vacuum insulation material according to the embodiment of the present invention has a thermal conductivity (initial thermal conductivity) of about 1.5 mW/(m · K) or less and has excellent thermal insulation performance corresponding thereto. In the case of using such a vacuum insulation material, not only the thickness of the heat insulating layer is reduced, but also energy efficiency can be improved by reducing heat loss.
Also, the vacuum insulation material and the method for manufacturing the same according to the embodiments of the present invention may enable manufacturing to be simple and manufacturing costs to be reduced, and may easily adjust the thickness according to the use and enable the surface state of the core material to be excellent.
Also, the vacuum insulation material and the method for manufacturing the same according to the embodiments of the present invention can provide an environmental effect capable of minimizing environmental pollution by using glass fiber (glass fiber) harmless to the human body.
Drawings
Fig. 1 is a sectional view of a vacuum insulation material for explaining an embodiment of the present invention.
Fig. 2 is a sectional view illustrating a structure of a core material applicable to a vacuum insulation material according to an embodiment of the present invention.
Fig. 3 is a sectional view illustrating a structure of a core material applied to a vacuum insulation material according to a comparative example.
Fig. 4 is a view showing a microstructure of glass fibers included in a core material applied to a vacuum insulation material according to an embodiment of the present invention.
Fig. 5a and 5b are sectional views for explaining a process of forming a core material applied to a vacuum insulation material according to an embodiment of the present invention.
Fig. 6a to 6d are views for explaining a process of forming a core material applied to a vacuum insulation material according to an embodiment of the present invention.
Fig. 7 is a view for explaining a method of forming a core material applied to a vacuum insulation material according to still another embodiment of the present invention.
Fig. 8 is a sectional view showing a structure of a skin material applicable to a vacuum insulation material according to an embodiment of the present invention.
Fig. 9 is a cross-sectional view showing a deformed shape of a vacuum insulation material according to an embodiment of the present invention.
Fig. 10 is a perspective view illustrating an overall shape of a vacuum insulation material according to an embodiment of the present invention.
Fig. 11 is a photographic image illustrating a vacuum insulation material prepared according to an embodiment of the present invention.
Fig. 12 to 16 are photographic images of various structures that the vacuum insulation material according to the embodiment of the present invention may have.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The following examples of the present invention are provided to enable those skilled in the art to more fully understand the present invention, and the scope of the present invention is not limited to the following examples, which may be modified in various other ways.
In the present specification, the terms used are only used for describing specific embodiments, and do not limit the present invention. In this specification, terms expressing the singular number may include the plural number unless the context clearly dictates otherwise. It should be understood that the terms "includes," "comprises," "including" and "comprising," and the like, used herein, are intended to specify the presence of stated features, steps, integers, operations, elements, components, and combinations thereof, but do not preclude the presence or addition of one or more other features, steps, integers, operations, elements, components, and combinations thereof. In the present specification, the term "connected" is used to include a meaning in which a certain element is directly connected to another element and a meaning in which another element is indirectly connected to another element.
In the present specification, the term "above" means that a certain component is located "above" another component, and includes a case where a certain component is in contact with another component and a case where another component is present between the two components. In this specification, the term "and/or" includes one and all combinations of more than one of the respective listed items. In addition, in the present specification, terms of expression degree such as "about", "actual", and the like are used only for understanding the present application, and the inherent manufacturing and material tolerances are to be considered to be used in the meaning of their numerical value, degree category or close thereto in order to prevent an infringer from illegally using the disclosure referring to the exact numerical value or the absolute numerical value.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. To ensure the clarity of the description and the convenience of the description, the dimensions of regions or parts shown in the drawings may be slightly exaggerated. Throughout the detailed description, like reference numerals denote like structural elements.
Fig. 1 is a sectional view of a vacuum insulation material 200 for explaining an embodiment of the present invention.
Referring to fig. 1, a vacuum insulation material 200 according to an embodiment of the present invention may include: a skin material 100 for forming an internal space SP1 (i.e., a receiving space); a core member 150 filled in the internal space SP1 of the skin material 100; and an adsorbent 170 disposed in the inner space SP1 of the sheath material 100 together with the core member 150.
Skin material 100 may include a first skin material 110 and an opposing second skin material 120. Edge portions of the first and second skin materials 110 and 120 may be joined, and an internal space SP1 may be defined between the first and second skin materials 110 and 120. In fig. 1, reference numeral E10 denotes a portion referring to an edge portion where the first skin material 110 is joined to the second skin material 120, i.e., denoted as a "wing portion". The wing portion E10 may be an extension or an expansion. Hereinafter, a specific structure that the skin material 100 may have will be described in further detail with reference to fig. 8.
The core material 150 may include an inorganic substance having a high porosity, for example, a porosity (porosity measured by mercury porosimetry) of 50% or more or 70% or more with respect to the entire volume of the core material 150. The inorganic substance may include glass fibers (glass fibers), and may have a porous structure in which pores are formed between adjacent glass fibers. Hereinafter, a specific structure that the core material 150 may have will be described in further detail with reference to fig. 2 and the like.
The adsorbent material 170 may be a member for adsorbing moisture and/or gas. Although only one adsorbent 170 is shown in fig. 1 in order to ensure convenience in description, the adsorbent 170 may actually include a moisture absorbent (moisture absorbent) and a gas getter (gas absorbent) separately formed therefrom. One or more moisture absorbents and one or more gas getters may be disposed in the internal space SP1 of the skin material 100.
For example, the moisture absorbent may include calcium oxide (calcium oxide), and may further include metal oxide (metal oxide) in addition to the calcium oxide. The moisture absorbent may be in the form of a thin pack (pack) or a pouch (pouch). However, the material and shape of the moisture absorbent are not limited thereto, and various changes may be made.
The gas getter can adsorb oxygen, nitrogen or carbon dioxide (CO) 2 ) And the like. For example, the gas getter may include metal oxides such as silver (Ag) oxide, copper (Cu) oxide, etc., and may further include a small amount of calcium oxide and metal, such as cobalt (Co), barium (Ba) or lithium (Li), in addition to the metal oxides. The gas getter may have a coin (coin) shape. However, the substance and shape of the gas getter are not limited thereto, and various changes may be made.
Also, in fig. 1, the position of the adsorbing material 170 is merely an example, and the position thereof may be variously changed. At least one of the moisture absorbent and the gas getter may be disposed in a predetermined region such as the middle of the internal space SP1, spaced apart from the first sheath 110 and the second sheath 120. Accordingly, the moisture and gas in the internal space SP1 can be easily removed by providing the moisture absorbent and/or the gas getter, and as a result, the heat insulation performance of the vacuum insulation material 200 can be improved.
The inner space SP1 of the skin material 100 in which the core member 150 and the adsorbent 170 are arranged may be in a vacuum state. Between the internal space SP1 and the core material, air in the air holes formed between the glass fibers constituting the core material can be actually removed to make the internal space SP1 in a vacuum state. E.g., relative to about 10 5 Pa, the degree of vacuum of the internal space SP1 can be reduced to about 10Pa or less. Excellent heat insulating performance can be achieved with a relatively thin thickness by minimizing the convection effect of air through a vacuum state. The vacuum insulation material 200 according to the embodiment of the present invention may have excellent insulation performance (low thermal conductivity) about 12 times or more as compared to the conventional polyurethane foam (polyurethane foam) insulation material. In addition, when comparing the thicknesses required for achieving the same thermal insulation performance, the conventional polyurethane foam requires a thickness of about 125mm, and the vacuum insulation material 200 according to the embodiment of the present invention requires a thickness of about 10mm or less. In fig. 1, the illustrated vacuum insulation material 200 may be a Vacuum Insulation Panel (VIP). However, the vacuum insulation material 200 may have other shapes than the plate shape in various cases.
Fig. 2 is a sectional view illustrating a structure of a core material applicable to a vacuum insulation material according to an embodiment of the present invention.
Referring to fig. 2, the core material applicable to the vacuum insulation material according to the embodiment of the present invention may include a multi-layer structure MS11 in which a plurality of single sheets S11 are stacked. The multilayer structure MS11 may be a glass fibre board. Wherein the single sheets S11 may respectively include glass fibers (glass fibers). In each of the monoliths S11, the single layer (single layer) standard basis weight (basis weight) or areal density of the glass fibers is less than about 160g/m 2 And more preferably, may be less than 100g/m 2 . In each of the sheets S11, when the sheet S11 is composed of a single layer of glass fibers, the areal density of the glass fibers may mean the total weight per unit area of the glass fibers. In each of the individual sheets S11, the above-mentioned area density of the glass fiber being smaller may mean that the thickness of the individual sheet S11 is relatively thin or that the diameter of the above-mentioned glass fiber used for the individual sheet S11 is relatively small.
For example, according to one embodiment, the areal density of the glass fibers may be about 10g/m in each of the individual sheets S11 2 ～70g/m 2 . The average diameter of the glass fiber may be about 13 μm or less. For example, the average diameter of the glass fibers can beIs about 6 to 13 μm in diameter. In the vacuum insulation material, the thickness of each single sheet S11 may be as thin as about 5mm or less. Also, the plurality of structures MS11 includes a plurality of single pieces S11, for example, includes about 10 or more single pieces S11, and preferably, may include about 15 or more single pieces S11. The number of the single sheets S11 constituting the multilayer structure MS11 may be about 10 or more and 100 or less. When the entire core maintains a predetermined thickness, the thickness of each segment S11 decreases with the number of stacked segments S11.
In one embodiment, the horizontal alignment characteristic of the glass fiber can be greatly improved based on the whole multilayer structure MS11 formed by stacking more than 15 single sheets. Specifically, in each of the sheets S11, the glass fibers have a nonwoven fabric characteristic of being randomly arranged, but have an areal density of 50g/m 2 ～70g/m 2 The horizontally aligned component of the glass fibers is larger than the vertically aligned component in each of the sheets S11, and therefore, in the thin-thickness sheet S11, it results in maximizing the arrangement density of the glass fibers in the horizontal direction. As a result, the connection of the glass fibers in the vertical direction between the plurality of single sheets S11 can be minimized. As the plurality of sheets S11 are stacked, since the glass fibers are arranged in the respective sheets S11 in the substantially horizontal direction, the connection between the glass fibers can be point (point) contact between two adjacent sheets S11, and the continuity of the connection in the vertical direction can be minimized or effectively suppressed. Thus, the heat conduction through the glass fibers can be achieved mainly in the horizontal direction along the plane of the sheet S11, and the heat conduction between the sheets S11 in the vertical direction can be effectively blocked. As a result, the vacuum insulation material according to the embodiment of the present invention can inhibit heat conduction between the facing surfaces of the vacuum insulation material by blocking heat conduction between the single sheets S11 as well as blocking heat conduction between the vacuum insulation material and the vacuum insulation material due to radiation, and thus can have very excellent heat insulation performance. For example, the vacuum insulation material of the embodiment of the present invention may have a very low level of thermal conductivity (initial thermal conductivity) of about 1.5 mW/(m · K) or less. However, the maximum thermal conductivity of the vacuum insulation material may be greater than about 0.5 mW/(m · K).
In each of the sheets S11, the glass fiber has a basis weight of about 100g/m 2 For example, about 50g/m 2 ～70g/m 2 The average diameter of the glass fiber is about 13 μm or less, for example, about 6 to 13 μm, and in each of the individual sheets S11 of the multilayer structure MS11, it is advantageous to minimize the heat conduction path as the horizontal alignment characteristic of the glass fiber is improved. In particular, in each of the sheets S11, when the weight per unit area of the glass fiber is controlled to be about 50g/m 2 ～70g/m 2 And the number of the stacked sheets S11 is increased, the arrangement limitation and the arrangement density in the horizontal direction can be improved, and when glass fiber having a low diameter of about 13 μm or less or 8.5 μm or less is used, the effect of minimizing the heat conduction path can be obtained. In each of the sheets S11, when the weight per unit area of the glass fiber is 100g/m 2 In the above case, or when the average diameter of the glass fiber is larger than 13 μm or more, as the thickness of the sheet S11 becomes thicker and the number of usable sheets S11 decreases, the vertical arrangement of the glass fiber in each sheet S11 increases (the heat conduction is proportional to the diameter and inversely proportional to the length, and therefore, the amount of heat conducted through the cross section of the glass fiber increases as the diameter increases), and therefore, it becomes difficult to ensure low thermal conductivity. On the other hand, in each of the sheets S11, when the weight per unit area of the above glass fiber is less than about 50g/m 2 Alternatively, if the average diameter of the glass fibers is less than about 6 μm, it may be difficult to manufacture the sheet S11 itself because the thickness of the sheet S11 is too small or the strength is low. Therefore, according to the embodiment of the present invention, in each of the single sheets S11, it is preferable that the weight per unit area of the glass fiber is about 50g/m 2 ～100g/m 2 Or about 50g/m 2 ～70g/m 2 The average diameter of the glass fiber is about 6 to 13 μm, and more preferably, about 6 to 8.5 μm.
On the other hand, the average length of the glass fiber may be about 1mm to 50mm. The glass fiber used in the embodiment of the present invention may be a long fiber. The glass fiber may be "chopped glass fiber". In this case, in each of the individual sheets S11, the horizontal alignment characteristic of the glass fibers can be further improved. Therefore, it is more advantageous to reduce the thermal conductivity (initial thermal conductivity) of the vacuum insulation material of the embodiment to 1.5 mW/(m · K).
In the vacuum insulation material according to the embodiment of the present invention, the thickness of the vacuum-compressed multilayer structure MS11 is about 0.5cm to 5cm, and for example, may be about 0.8cm to 1cm. However, such a thickness range is merely an example, and the thickness of the multi-layer structure MS11 may be variously changed as appropriate according to the use of the vacuum insulation material.
In the embodiment of the present invention, the single sheet S11 is composed of only glass fibers, or may include glass fibers as a main component, and in some cases, may include porous powder such as silica powder (silica powder) and organic fibers (PP, PET fiber) or organic substances in addition to glass fibers.
Fig. 3 is a sectional view illustrating a structure of a core material applied to a vacuum insulation material according to a comparative example.
Referring to fig. 3, the core material applied to the vacuum insulation material of the comparative example may include a multi-layered structure MS22 in which ge sheets S22 are laminated. The single sheets S22 may include glass fibers (glass fibers), respectively. In each of the sheets S22, the glass fiber may have a basis weight or an areal density of 100g/m 2 ～145g/m 2 . The average diameter of the glass fiber may be 13 to 12 μm. Also, with respect to the multilayer structure MS11 of the embodiment shown in fig. 2, if the total thickness of the multilayer structure MS22 of the comparative example is the same as the total thickness of the multilayer structure MS11, the number of the individual pieces S22 constituting the multilayer structure MS22 may be half or close to half.
As shown in the comparative example of FIG. 3, in each of the sheets S22, the glass fiber has a basis weight of 100g/m 2 ～145g/m 2 The average diameter of the glass fiber is 13 to 12 μm, and when the number of stacked sheets S22 is relatively small, the thermal conductivity (initial thermal conductivity) of the vacuum insulation material having the multilayer structure MS22 to which the sheet S22 is applied in the comparative example is about 1.75 mW/(m · K), which is larger than that of the embodiment to which the multilayer structure S11 shown in fig. 2 is appliedThe thermal conductivity of the vacuum insulation material of the example (about 1.5 mW/(mK) or less). Therefore, the vacuum insulation material of the embodiment using the multi-layered structure S11 shown in fig. 2 may exhibit more excellent thermal insulation performance than the vacuum insulation material of the comparative example using the multi-layered structure S22 shown in fig. 3.
Fig. 4 is a view showing a microstructure of glass fibers included in a core material applied to a vacuum insulation material according to an embodiment of the present invention.
Referring to fig. 4, the glass fiber included in the core material applied to the vacuum insulation material according to the embodiment of the present invention may be arranged in a horizontal direction parallel to the circumference of the multi-layered structure to form a network structure within a single sheet or in a multi-layered structure formed by stacking single sheets. The glass fibers may also have a fiber structure similar to that of nonwoven fabrics. However, the microstructure of the glass fiber shown in fig. 4 is merely an example, and various changes may be made.
The method for preparing a vacuum insulation material according to an embodiment of the present invention may include the steps of: preparing a sheath material, a core material and an adsorbent material for forming an internal space, respectively; disposing the core material and the adsorbent in an inner space of the outer cover material; and forming an inner space of the outer skin material in which the core material and the adsorbent are arranged in a vacuum state. The outer skin material is formed by arranging a first outer skin material and a second outer skin material facing each other, the second outer skin material has a shape corresponding to the first outer skin material, and the edge portions of the first outer skin material and the second outer skin material are joined by thermal welding to form the internal space therebetween. The edge members of the first and second outer skins are used as an opening (entrance) for allowing the internal space to be accessed from the outside while maintaining a partially unjoined state. The core material and the adsorbent are disposed in the internal space formed by the sheath material through the opening. Next, the air in the internal space is removed by suction through the opening to form a vacuum state, and the opening is sealed by heat fusion. The core material and the adsorbent may correspond to the core material 150 and the adsorbent 170 described with reference to fig. 1 and 2. However, the above-mentioned specific method for preparing the vacuum insulation material is merely an example, and reference may be made to a known technique in the corresponding technical field.
In the method of manufacturing a vacuum insulation material according to an embodiment, the step of preparing the core material includes the steps of: forming a plurality of monolithic sheets comprising glass fibers (glass fibers); and laminating said plurality of sheets and heat-sealing them to form a multilayer structure, wherein in each of said sheets, said glass fiber may have a weight per unit area of less than about 100g/m 2 。
Fig. 5a and 5b are sectional views for explaining a process of forming a core material applied to a vacuum insulation material according to an embodiment of the present invention.
Referring to fig. 5a, the step of preparing the core material may include the step of forming a plurality of single sheets S10 including glass fibers (glass fibers).
Referring to fig. 5b, the step of preparing the core material may include a step of stacking a plurality of the sheets S10 and forming a multi-layered structure by press-fitting.
As shown in fig. 5b, the multi-layer structure MS10 is placed in the inner space of the outer cover together with the adsorbent so that the inner space can be in a vacuum state. With the internal space in a vacuum state, the multilayer structure MS10 can be further compressed in its thickness direction. The "multilayer structure" of the core material disposed inside the vacuum insulation material prepared in the above-described method may correspond to the multilayer structure MS11 described with reference to fig. 2.
In each of the individual sheets S10, the glass fibers have a basis weight of less than about 100g/m 2 For example, it may be about 50g/m 2 ～70g/m 2 . The glass fiber has an average diameter of about 13 μm or less, and may have a diameter of about 6 to 13 μm, for example. The average length of the glass fiber may be about 1mm to 50mm. The multilayer structure MS10 may include more than 15 individual sheets S10. After the vacuum insulation material is prepared, the thickness of the single piece (i.e., corresponding to S11 of fig. 2) may be about 5mm or less in a state where the vacuum insulation material is included. The above conditions and their technical effects may be the same as those described with reference to fig. 2. As a result, thermal conductivity (initial thermal conductivity) can be prepared according to embodiments of the present inventionRate) of about 1.5 mW/(m · K) or less. In the case of using such a vacuum insulation material, not only the thickness of the heat insulation layer is reduced, but also the energy efficiency can be greatly improved by reducing heat loss.
Fig. 6a to 6d are views for explaining a process of forming a core material applied to a vacuum insulation material according to an embodiment of the present invention.
Referring to fig. 6a, a glass fiber that may be used to make the core material is shown. The glass fibers may have an average diameter of about 13 μm or less or about 8.5 μm or less. The glass fiber may have an average length of about 1mm to 50mm.
Fig. 6b shows the equipment (thin film equipment) required for making the above glass fiber into a thin film. Such an apparatus can be used to disperse the glass fibers onto the surface of a roll to form a single sheet in which the glass fibers are randomly arranged mainly in the horizontal direction. The single sheet may have a prescribed thickness. In each of said monoliths, said glass fibers have a basis weight of less than about 100g/m 2 For example, it may be about 50g/m 2 ～70g/m 2 . For example, the above-described single sheet can be manufactured in a manner similar to that of nonwoven fabric. Thus, a plurality of individual pieces can be manufactured by the above-described method.
Referring to fig. 6c, a stack can be driven by stacking the plurality of single disks. The laminate is denoted by reference numeral MS10 a.
Referring to fig. 6d, a multilayer structure in which the plurality of sheets are pressed (bonded) may be formed by performing a thermocompression bonding process on a stacked body MS10a in which the plurality of sheets are stacked. In this case, a prescribed thermocompression bonding apparatus HP1 may be used. The above-mentioned thermocompression bonding apparatus HP1 may include a hot press (hot press). For example, in the thermocompression bonding step, the thermocompression bonding temperature may be about 600 ℃. For example, in the above thermocompression bonding process, the stacked body MS10a may be heated to about 500 to 750 ℃. Thus, the multi-layer structure MS10 as shown in fig. 5b may be formed by the above-described method.
In some cases, before the step of performing the thermocompression bonding step, a temporary bonding step of performing a needle punching (knitting) step on the laminated body MS10a in which a plurality of individual sheets are laminated may be further included. In other words, the step of forming the above-described multilayer structure may include the steps of: performing a needling (needling) process on a laminated body MS10a formed by laminating a plurality of single sheets; and performing a thermocompression bonding process on the stacked body MS10 a. The needling (needling) process is exemplified as shown in fig. 7.
Referring to fig. 7, after arranging a needle mat NM1 including a plurality of needle-punched holes N10 on a laminated body MS10a in which a plurality of single sheets are laminated, a needle punching (needling) step of punching the laminated body MS10a with the plurality of needle-punched holes N10 is performed by moving the needle mat NM1 up and down. The end of the needle N10 may be bent into a predetermined shape. Thus, temporary bonding is induced by entanglement between adjacent sheets.
In one embodiment, the needling (needling) process described above is performed on one side (the upper surface in the drawing) of the laminate MS10a for only a partial thickness of the laminate MS10a, or may be performed for a limited time and number of times at a level that maintains the horizontally oriented components of the glass fibers greater than the vertically oriented components.
The above needling (needling) process for a partial thickness is performed for a partial thickness of only one surface (upper surface in the drawing) of the laminate MS10a without penetrating the laminate MS10a in the thickness direction. The above-described needling process is performed for the thickness portion for minimizing the orientation of the glass fibers induced to be entangled in the thickness direction of the laminate so as to prevent the thermal conductivity between the facing main surfaces from being increased by the glass fibers mainly including the vertical-direction component for entanglement. In the needling (needling) step, the plurality of sheets can be temporarily joined to a predetermined degree as the glass fibers are entangled in the vertical direction in a part of the laminate MS10 a. After the needle punching (needling) process is performed, a multi-layer structure may be formed by performing a thermal compression bonding process as shown in fig. 6 d. However, the needling (needling) process described with reference to fig. 7 may be an exemplary or alternative process.
According to the embodiment of the present invention, the core material having excellent horizontal alignment characteristics and excellent surface conditions of the glass fiber can be easily formed. Also, the thickness of the core material can be very easily adjusted according to the application by adjusting the number of times of laminating the individual sheets. In addition, the method for manufacturing the vacuum insulation material according to the embodiment not only has excellent workability, but also is advantageous in reducing manufacturing costs.
Fig. 8 is a sectional view showing a structure of a skin material applicable to a vacuum insulation material according to an embodiment of the present invention.
Referring to fig. 8, the outer skin material applicable to the vacuum insulation material according to the embodiment of the present invention may include a multi-film structure. For example, the multi-film structure may include a linear low density polyethylene (L-LDPE) layer 10 or a cast polypropylene (CPP) layer 10/an aluminum layer 20 or a vacuum metalized ethylene vinyl alcohol copolymer (VM-EVOH) layer 20/a nylon layer 30 and a vacuum metalized polyethylene terephthalate (VM-PET) layer 40, which are sequentially stacked from the inside to the outside. The aluminum layer 20 may be an aluminum foil (foil). In the above-described multiple film structure, linear low density polyethylene as a bonding layer, bonding may be performed by thermal welding or ultrasonic welding.
The above-described multiple film structure is applicable to the first skin material 110 and the second skin material 120 of fig. 1. The sheath material with the structure can effectively block the permeation of gas and moisture and play a role in protecting the core material and the adsorbing material. However, the structure of the skin material described with reference to fig. 8 is an example, and various changes may be made in different cases.
Fig. 9 is a cross-sectional view showing a deformed shape of the vacuum insulation material 200 according to the embodiment of the present invention. Fig. 9 illustrates a state in which the wing portion E10 is folded and attached to the body portion of the vacuum insulation material 200 in the structure illustrated in fig. 1. The wing E10 may be attached toward the lower surface or the upper surface side of the body. When attaching the wing portion E10, a predetermined adhesive member such as an adhesive tape may be used. Since the wing part E10 is folded and attached, the vacuum insulation material 200 may have a rectangular plate or hexahedral shape or a chamfered polyhedron with a partial edge thereof cut.
Fig. 10 is a perspective view illustrating an overall shape of a vacuum insulation material 200 according to an embodiment of the present invention. As shown in fig. 10, the vacuum insulation material 200 according to the embodiment of the present invention may have a rectangular plate or a hexahedral shape. The structure of the vacuum insulation material 200 shown in fig. 10 may correspond to the case where the wing portion E10 shown in fig. 9 is folded to be attached to the body portion.
Fig. 11 is a photographic image illustrating a vacuum insulation material prepared according to an embodiment of the present invention. The vacuum insulation material of fig. 11 may have a structure corresponding to the vacuum insulation material 200 shown in fig. 10.
However, the structure of the vacuum insulation material according to the embodiment of the present invention is not limited to the flat plate-shaped structure, and various changes may be made.
Fig. 12 to 16 are photographic images of various structures that the vacuum insulation material according to the embodiment of the present invention may have.
Fig. 12 illustrates a vacuum insulation material of a flat (flat) structure, fig. 13 illustrates a vacuum insulation material of a dent (dent) structure in which a dent region exists, fig. 14 illustrates a vacuum insulation material of a slanted (bending) structure, fig. 15 illustrates a vacuum insulation material of a curved (curved) structure, and fig. 16 illustrates a vacuum insulation material formed with a hole (hole) structure. In addition, the vacuum insulation material may have various modified structures such as a cutting type, a slim type, a cylinder type, and a circular arc type.
The vacuum heat-insulating material of the embodiment of the invention can be applied to various fields of household appliances, industry, buildings and the like. For example, in the case of being applied to home appliances, it can be applied to various home appliances such as general refrigerators, kimchi refrigerators, water purifiers, electric cookers, and the like. In the case of industrial applications, it is applicable to refrigerated warehouses, refrigerated/refrigerated vehicles, refrigerated containers, vending machines, and the like. In the case of application to buildings, it can be applied to interior/exterior heat insulating materials, entry doors/fire doors, and the like of buildings. In addition to being used as an insulation material surrounding a fuel tank of a Liquefied Natural Gas (LNG) fuel line or a liquefied natural gas storage tank, the vacuum insulation material according to an embodiment of the present invention may be applicable to all fields to which the insulation material is applied.
As described above, the vacuum insulation material according to the embodiment of the present invention has excellent thermal insulation performance as well as low thermal conductivity of a predetermined level or less. For example, the vacuum insulation material according to the embodiment of the present invention has a thermal conductivity (initial thermal conductivity) of about 1.5 mW/(m · K) or less and has excellent thermal insulation performance corresponding thereto. In the case of using such a vacuum insulation material, not only the thickness of the heat insulating layer is reduced, but also energy efficiency can be improved by reducing heat loss. Also, the vacuum insulation material and the method for manufacturing the same according to the embodiments of the present invention may enable the manufacturing to be simple and the manufacturing cost to be reduced, and may enable the thickness to be easily adjusted according to the use and the surface state of the core material to be excellent. Also, the vacuum insulation material and the method for manufacturing the same according to the embodiments of the present invention can provide an environmental effect of minimizing environmental pollution by using glass fiber harmless to the human body.
Further, in the embodiments as described above, the glass fiber suitable for the vacuum insulation material may include silicon dioxide (SiO) 2 ) Alumina (Al) 2 O 3 ) Calcium oxide (CaO) as a main component, potassium oxide (K) 2 O) and sodium oxide (Na) 2 O) as a subcomponent. In the above glass fiber, potassium oxide (K) needs to be controlled in order to maintain the heat insulating property 2 O) and sodium oxide (Na) 2 O), the above total content may be about 1.5 weight percent or less. For example, in the glass fiber, the potassium oxide (K) is 2 O) may be present in an amount of about 0.2 to 1 weight percent, for example, the sodium oxide may be present in an amount of about 0.05 to 0.8 weight percent. In the glass fiber, the potassium oxide (K) may be 2 O) may be present in an amount of about 0.31 weight percent, the above-mentioned sodium oxide (Na) 2 O) may be present in an amount of about 0.28 weight percent. For example, the above potassium oxide (K) 2 O) may be present in an amount of about 0.71 weight percent, the above-mentioned sodium oxide (Na) 2 O) may be present in an amount of about 0.32 weight percent. For example, the above potassium oxide (K) 2 O) may be present in an amount of about 0.096 weight percent, sodium oxide (Na) as described above 2 O) may be present in an amount of about 0.24 weight percent. For example, the above potassium oxide (K) 2 O) may be present in an amount of about 0.084 weight percent, the oxidation described aboveSodium (Na) 2 O) may be present in an amount of about 0.66 weight percent.
In the glass fiber, the potassium oxide (K) is 2 O) and sodium oxide (Na) 2 O) may be present in a total amount of about 0.25 weight percent or more. In the above glass fiber, when the above potassium oxide (K) is used 2 O) and sodium oxide (Na) 2 O) is more than about 1.5 weight percent, the thermal conductivity and strength of the glass fiber may be difficult to apply to the multi-layer sheet, and it is difficult to achieve excellent thermal insulation performance. Therefore, it is preferable that the potassium oxide (K) is contained in the glass fiber 2 O) and sodium oxide (Na) 2 O) should be about 1.5 weight percent or less. On the other hand, in addition to the above potassium oxide (K) 2 O) and sodium oxide (Na) 2 O), the glass fiber may additionally contain boron oxide (B) 2 O 3 ) Magnesium oxide (MgO), iron oxide (Fe) 2 O 3 ) And the like.
The vacuum insulation material may be manufactured to recognize colors according to the performance difference, and may be managed according to a color recognition method. For example, the management can be realized by recognizing the peripheral color by expressing the vacuum insulator having the thermal conductivity of 1.5mW/mk or less in black, the vacuum insulator having the thermal conductivity of 1.86mW/mk or less in green, the vacuum insulator having the thermal conductivity of 2.3mW/mk or less in yellow, the vacuum insulator having the thermal conductivity of 2.9mW/mk or less in red, and the vacuum insulator having the thermal conductivity of 4.0mW/mk or less in ivory. Therefore, when a refrigerator or the like is disposed of, the performance related to the vacuum insulation material suitable for it can be visually recognized, and it can be easily recycled for use as a vacuum insulation material for construction or other uses.
The present specification discloses preferred embodiments of the present invention, and in the course of this specification, although specific terms are used, such terms are used for the understanding of the present invention, have the ordinary meanings used for the simple explanation of the technical contents of the present invention, and do not limit the scope of the present invention. It is obvious to those skilled in the art to which the present invention pertains that other modifications derived from the technical idea of the present invention can be implemented in addition to the embodiments disclosed herein. For example, various modifications may be made to the vacuum insulation material and the method of manufacturing the same according to the embodiments described with reference to fig. 1 to 16 by those of ordinary skill in the art to which the present invention pertains. Therefore, the scope of the present invention is not limited to the embodiments described above, and should be defined based on the technical idea described in the claims.
Description of reference numerals
Reference numerals relating to the main parts of the drawings
100: outer skin material 110: first skin material
120: second outer skin material 150: core material
170: adsorbing material 200: vacuum heat insulating material
E10: wing part SP1: inner space
S10, S11: monolithic MS10, MS11: multilayer structure
HP1: thermocompression bonding apparatus NM1: needled felt

Claims (21)

1. A vacuum insulation material characterized in that,
the method comprises the following steps:
a skin material for forming an inner space;
a core material filled in the inner space of the outer skin material; and
an adsorbent disposed in the inner space of the sheath material together with the core material,
the core material has a multilayer structure in which a plurality of individual sheets each including glass fibers are laminated, the multilayer structure including 10 or more of the individual sheets,
the inner space of the outer skin material in which the core material and the adsorbent are disposed is in a vacuum state.
2. The vacuum insulation material according to claim 1, wherein the glass fiber has a weight per unit area of less than 100g/m in each of the sheets 2 。
3. The vacuum insulation material according to claim 2, wherein the glass fiber has a weight per unit area of 10g/m in each of the sheets 2 ～70g/m 2 。
4. The vacuum insulation material according to claim 1, wherein the glass fiber has an average diameter of 13 μm or less.
5. The vacuum insulation material according to claim 4, wherein the glass fiber has an average diameter of 6 μm or more.
6. The vacuum insulation material according to claim 1, wherein the glass fiber has an average length of 1mm to 50mm.
7. The vacuum insulation material according to claim 1, wherein the thickness of the single sheet is 5mm or less.
8. The vacuum insulation material according to claim 1, wherein the vacuum insulation material has a thermal conductivity of 1.5 mW/(m-K) or less.
9. The vacuum insulation material according to claim 1,
the skin material includes a multi-layer film structure,
the multi-layer film structure comprises a linear low-density polyethylene layer or a casting polypropylene layer/an aluminum layer or a vacuum metalized ethylene-vinyl alcohol copolymer layer/a nylon layer and a vacuum metalized polyethylene terephthalate layer which are sequentially laminated.
10. The vacuum insulation material according to claim 1, wherein the adsorbent includes a moisture absorbent and a gas getter.
11. A method for preparing a vacuum insulation material is characterized in that,
the method comprises the following steps:
preparing a sheath material, a core material and an adsorbent material for forming an internal space, respectively;
disposing the core material and the adsorbent in an inner space of the outer cover material; and
so that the inner space of the outer skin material in which the core material and the adsorbent are arranged is in a vacuum state,
the step of preparing the core material comprises the following steps:
forming a plurality of monoliths comprising glass fibers; and
the above-mentioned plurality of individual sheets are laminated and laminated to form a multilayer structure,
the multilayer structure comprises more than 10 of the above single sheets.
12. The method of manufacturing a vacuum insulation material according to claim 11, wherein the step of forming the multilayer structure includes a step of performing a thermocompression bonding process on a laminate formed by laminating the plurality of individual sheets.
13. The method of manufacturing a vacuum insulation material according to claim 11, wherein the step of forming the multi-layered structure comprises the steps of:
performing a needling process on a laminate formed by laminating the plurality of single sheets; and
and performing a thermocompression bonding process on the laminate.
14. The method of manufacturing a vacuum insulation material according to claim 13, wherein the needling step is performed from one surface of the laminate to a partial thickness of the laminate.
15. The method of claim 11, wherein the glass fiber has a weight per unit area in each of the individual sheetsThe amount is less than 100g/m 2 。
16. The method of claim 15, wherein the glass fiber has a weight per unit area of 50g/m in each of the sheets 2 ～70g/m 2 。
17. The method of manufacturing a vacuum insulation material according to claim 11, wherein the glass fiber has an average diameter of 13 μm or less.
18. The method of claim 11, wherein the glass fiber has an average length of 1mm to 50mm.
19. The method of manufacturing a vacuum insulation material according to claim 11, wherein the thickness of the single piece is 5mm or less.
20. The method according to claim 11, wherein the vacuum insulation material has a thermal conductivity of 1.5 mW/(m · K) or less.
21. A vacuum insulation material characterized in that,
the method comprises the following steps:
a skin material for forming an inner space;
a core material filled in an inner space of the outer skin material; and
an adsorbent disposed in the inner space of the sheath material together with the core material,
the core material has a multilayer structure in which a plurality of single sheets are stacked, each of the single sheets including a glass fiber, the glass fiber containing potassium oxide and sodium oxide, the total content of the sodium oxide in the glass fiber being 1.5 wt% or less,
the inner space of the outer skin material in which the core material and the adsorbent are arranged is in a vacuum state.
CN202211099802.3A 2021-09-07 2022-09-07 Vacuum heat insulating material and method for producing same Pending CN115771318A (en)

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CN115771318A true CN115771318A (en) 2023-03-10

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