TW201622984A - Envelope for vacuum insulation panel and vacuum insulation panel including the same - Google Patents

Abstract

An outer skin material for a vacuum insulation comprising: a protection layer; a barrier layer that is a film containing no metal; and a sealing layer, and a vacuum insulation including the same are provided.

Description

Skin material for vacuum insulation material and vacuum insulation material containing the same

The present invention relates to a sheath material for a vacuum insulation material and a vacuum insulation material comprising the same.

The vacuum insulation material is excellent in heat insulation effect due to a sheath material having a low gas or moisture permeability and a core material imparting a vacuum state, and the heat insulation performance is higher than that of an existing heat insulating material such as polyurethane or styrofoam. Several times more advanced raw materials.

A sheath material of a general vacuum insulation material is formed of a composite film in which a plurality of layers are laminated. By using a sheath material composed of such a composite film to seal the core material, the sheath material of the vacuum insulation material can greatly affect the durability and heat insulation of the vacuum insulation material depending on its composition and physical properties.

Problem to be solved by the invention

An example of the present invention provides a sheath material for a vacuum insulation material which ensures excellent heat insulation performance by preventing a heat-bridge phenomenon and achieves excellent long-term durability.

Another example of the present invention provides a vacuum insulation material including the above-described skin material for a vacuum insulation material, which can ensure excellent heat insulation and durability based on the above-mentioned skin material for a vacuum insulation material.

Technical means of solving problems

In an example of the present invention, a sheath material for a vacuum insulation material is provided, the sheath material for a vacuum insulation material comprising: a protective layer; a barrier layer which is not a metal film; and a sealing layer.

The above metal-free film may be a biaxially oriented polyvinyl alcohol (BO-PVOH) film.

The above barrier layer may have a thickness of 10 μm to 30 μm.

The protective layer may include at least one selected from the group consisting of polyethylene terephthalate (PET), nylon, and combinations thereof.

The above protective layer may have a thickness of 5 μm to 20 μm.

The above sealing layer may comprise a resin film having a melting point of from 125 ° C to 170 ° C.

The sealing layer may include at least one selected from the group consisting of cast polypropylene (CPP), linear low density polyethylene (LLDPE), and combinations thereof.

The above sealing layer may have a thickness of 25 μm to 60 μm.

The water permeability of the outer skin material for a vacuum insulation material may be 0.1 g/m ² •day or less under the conditions of a temperature of 38 ° C and a relative humidity (RH) of 100%.

The oxygen permeability of the outer skin material for a vacuum insulation material may be 0.05 cc/m ² •day or less under the conditions of a temperature of 23 ° C and a relative humidity of 0%.

In another example of the present invention, a vacuum insulation material is provided, the vacuum insulation material comprising: a core material comprising glass fibers; and the above-mentioned outer skin material for vacuum insulation material for accommodating the core material and for coating the vacuum insulation material The inside of the material is depressurized.

The glass fiber may have an average diameter of 10 μm or less.

The linear thermal insulation material may have a linear thermal conductivity of 2 mW/mK or less.

Control the efficacy of prior art

The above-mentioned material for the vacuum insulation material can achieve barrier properties and thermal insulation properties together. Further, the vacuum heat insulating material including the above-mentioned outer skin material for a vacuum heat insulating material can achieve excellent long-term durability and heat insulation together.

The advantages and features of the present invention, as well as the methods for achieving these advantages and features, will be more apparent from the various embodiments described hereinafter. However, the present invention is not limited to the various embodiments disclosed below, and can be implemented in various ways that are different from each other. This embodiment is only used to make the disclosure of the present invention more complete and contribute to the general technical field of the present invention. The skilled artisan fully understands the scope of the invention, which is defined in accordance with the scope of the invention. Throughout the specification, the same reference numerals refer to the same structural elements.

In an example of the present invention, a sheath material for a vacuum insulation material is provided, the sheath material for a vacuum insulation material comprising: a protective layer; a barrier layer which is not a metal film; and a sealing layer.

A conventional vacuum insulation material outer skin material uses a multilayer film as a barrier layer, and the multilayer film is formed using a metal deposition film or a foil. A barrier layer using a foil is advantageous in terms of long-term durability, but causes a heat-bridge phenomenon due to excellent thermal conductivity of the metal itself, resulting in a problem of lowering the heat insulating property of the vacuum insulation material. Further, the barrier layer using the metal deposition film is prepared by depositing a metal such as aluminum on a film of a transparent resin such as polyethylene terephthalate (PET), and when it is used as a barrier layer, The thermal bridge phenomenon is reduced compared to the foil, but it is still not easy to improve the thermal insulation performance due to the basic metal thermal conductivity.

1 shows a cross section of a sheath material 100 for a vacuum insulation material according to an example of the present invention. The sheath material 100 for a vacuum insulation material includes a protective layer 30, a barrier layer 20, and a seal layer 10, and the barrier layer may be a metal-free film. The above "metal-free film" means a film which does not contain a film of a metal material or a metal deposition layer at all. The above-mentioned outer skin material for a vacuum insulation material includes a barrier layer which does not contain a metal film to prevent thermal bridge phenomenon, thereby achieving not only excellent heat insulation performance but also excellent long-term durability.

Specifically, the above-mentioned metal-free film may be a biaxially oriented polyvinyl alcohol (BO-PVOH) film. Generally, in the case of a cast polyvinyl alcohol (PVOH) film, the oxygen permeability measured at a temperature of 23 ° C exhibits a value of about 0.1 cc / m 2 • day, and instead, biaxially stretched poly The vinyl alcohol (BO-PVOH) film can exhibit a value of 0.05 cc/m 2 day or less under the same temperature conditions. This is because the general polyvinyl alcohol (PVOH) increases the degree of orientation of the polymer in the case of biaxial stretching, and as a result, the barrier property is improved. That is, the above-mentioned metal-free film contains a biaxially oriented polyvinyl alcohol (BO-PVOH) film, and excellent barrier properties can be achieved even without containing a metal.

The above metal-free film may have a thickness of from about 10 μm to about 30 μm. The above-mentioned metal-free film has a thickness in the above range, so that the above-mentioned barrier layer including the same can ensure excellent long-term durability and flexibility. In the case where the thickness of the above-mentioned non-metal-containing film is less than about 10 μm, it is difficult to ensure long-term durability because the barrier property is lowered, and in the case where the thickness of the above-mentioned non-metal-containing film is more than about 30 μm, since the film rigidity increases, Therefore, there is a concern that a defect occurs in the folded portion when preparing the vacuum heat insulating material.

The above-mentioned skin material for a vacuum insulation material includes a protective layer which functions to protect the vacuum insulation material from the outside for the first time. The protective layer may be a single film formed of one type of film, or may be a multilayer film in which a plurality of films of the same or different materials are laminated.

Specifically, the protective layer may include at least one selected from the group consisting of polyethylene terephthalate (PET), nylon, and a combination thereof.

The protective layer may comprise a nylon membrane, and a nylon membrane may be formed in the outermost layer in order to maximize protection from external impacts that may occur during preparation and transportation. When a nylon film is formed on the outermost periphery of the above protective layer, it is advantageous in terms of abrasion resistance.

The above protective layer may have a thickness of from about 5 μm to about 20 μm. In the case where the thickness of the protective layer is less than about 5 μm, the possibility of generating a hole by an external impact is large, and in the case where the thickness of the protective layer is more than about 20 μm, the impact resistance satisfies a predetermined level, but there is The rigidity of the film increases, and the defect of the defective portion of the vacuum insulation material occurs. The thickness of the protective layer satisfies the above range, so that excellent thermal insulation properties can be ensured together with the above-mentioned barrier layer, and excellent impact resistance and flexibility required for processing can be ensured together.

The outer skin material for a vacuum insulation material includes a sealing layer, and the sealing layer serves to maintain the panel shape by adhering the outer skin material for the vacuum insulation material to the core material, and sealing the core material by thermocompression bonding. effect.

The sealing layer is for effectively maintaining a vacuum state inside the sheath material for a vacuum insulation material, and may include a resin film having a melting point of about 125 ° C or higher, for example, a resin film having a melting point of about 125 ° C to about 170 ° C. When the resin film used as the above sealing layer has a melting point in the above range, the barrier property under high temperature conditions can be improved. In the case where the melting point of the above sealing layer is less than about 125 ° C, there is a problem that the barrier property is lowered under high temperature conditions. In the case where the melting point of the above sealing layer is greater than about 170 ° C, there is a seal during the preparation of the vacuum insulation material. In the process, there is a concern that defects of other adjacent films are caused.

The sealing layer may include at least one selected from the group consisting of cast polypropylene (CPP), linear low density polyethylene (LLDPE), and combinations thereof.

Specifically, the above sealing layer may comprise linear low density polyethylene (LLDPE) and a polymer having a high melting point, for example, a film prepared by mixing polypropylene. In this case, the resin film used as the above-mentioned sealing layer can easily ensure the melting point in the above range, whereby the heat resistance of the above-mentioned sealing layer is enhanced, and excellent barrier properties can be exhibited under high temperature conditions, even if the above-mentioned outer skin material Including the absence of a metal barrier layer also ensures excellent barrier properties.

Further, the sealing layer may comprise a cast polypropylene (CPP) film, in which case the cast polypropylene (CPP) has low oxygen permeability and low water permeability, even if the outer skin material includes no The metal barrier layer also ensures excellent barrier properties.

The above sealing layer may have a thickness of from about 25 μm to about 60 μm. In the case where the thickness of the sealing layer is less than about 25 μm, the sealing strength may be lowered. When the thickness of the sealing layer is greater than about 60 μm, the barrier property may be lowered due to an increase in oxygen permeability and water permeability in the horizontal direction. . That is, the thickness of the above-mentioned sealing layer is maintained in the above range, so that excellent sealing strength and barrier properties can be achieved together.

The moisture permeability of the outer skin material for a vacuum insulation material may be about 0.1 g/m ² ·day or less, for example, about 0.01 to about 0.1, at a temperature of about 38 ° C and a relative humidity (RH) of about 100%. g/m ² • day, for example, may be from about 0.01 to about 0.05 g/m ² •day. The above "water permeability" means the degree of penetration of water vapor through the sheath material, and the amount of water vapor permeated during 24 hours (one day) per unit area of the above-mentioned sheath material per square meter is expressed by the number of grams (g). The above-mentioned vacuum insulation material sheath material maintains a low water permeability as in the above range, so that excellent barrier properties against moisture can be achieved even if a metal-containing barrier layer is included, and long-term durability of the vacuum insulation material including the above range can be improved. Sex.

Further, under the condition that the temperature is about 23 ° C and the relative humidity (RH) is about 0%, the oxygen permeability of the outer skin material for vacuum insulation material may be about 0.05 cc / m ² • day or less. The above "oxygen permeability" means the degree of penetration of oxygen through the sheath material, and the above-mentioned vacuum insulation material maintains a low oxygen permeability as described above with the sheath material, so that even a barrier layer containing no metal film can be realized with respect to the gas. (gas) excellent barrier properties, and can improve the long-term durability of the vacuum insulation material including the above range.

The above-mentioned skin material for a vacuum insulation material can achieve low water permeability and low oxygen permeability as described above even if it is included as a barrier layer containing no metal film, and finally contains no metal, thereby exhibiting excellent heat insulation performance. It also ensures excellent barrier properties and long-term durability.

In another example of the present invention, a vacuum insulation material is provided, the vacuum insulation material comprising: a core material comprising glass fibers; and the above-mentioned outer skin material for vacuum insulation material for accommodating the core material and for coating the vacuum insulation material The inside of the material is depressurized.

Fig. 2 shows a cross section of a vacuum insulation material of another example of the present invention. The vacuum insulation material 200 includes a core material 40 and a sheath material 100, and the above-described outer skin material 100 is as described above. The vacuum insulation material 200 includes the above-described outer skin material 100 for a vacuum insulation material, thereby ensuring excellent heat insulation performance and long-term durability together.

The vacuum insulation material 200 includes a core material 40, and the core material may include an inorganic compound having a low thermal conductivity and little gas generation. For example, the core material may include a glass fiber and a fumed cerium oxide (fumed). At least one of the group consisting of silica, a silica board, an organic fiber, an organic foam, and combinations thereof.

The core material 40 may include a glass fiber, and specifically, the core material 40 may include a fiberglass board. The core material 40 may include a plate-like laminate that thermally-pressure-bonds a plurality of glass fiber sheets. In the case where the above-mentioned core material 40 contains glass fibers, excellent strength can be ensured, and it is advantageous in terms of improving heat insulating performance.

The glass fibers may have an average diameter of about 10 μm or less. For example, the glass fibers may have an average diameter of from about 0.5 μm to about 2 μm. At this time, the above "average diameter" means the average diameter of the cross section cut in a perpendicular manner with respect to the longitudinal direction of the above glass fiber. In the case where the average diameter of the above glass fibers is more than about 10 μm, since the voids inside the core material containing the above glass fibers are excessively large, serious convection of the gas entering the inside occurs, thereby possibly reducing the long-term durability of the vacuum insulation material. Sex.

The outer skin material 100 for vacuum insulation material includes a barrier layer 20 as a metal-free film. In this case, the core material 40 sealed by the outer skin material 100 contains glass fibers having an average diameter in the above-mentioned size range, so that the vacuum insulation is performed. The material 200 can ensure excellent thermal insulation performance and excellent long-term durability.

The vacuum thermal insulation material may have a linear thermal conductivity of about 2 mW/mK or less. For example, the vacuum thermal insulation material may have a linear thermal conductivity of about 1.5 mW/mK or less. The above "linear thermal conductivity" means the thermal conductivity per 1 mm unit length with respect to the edge portion of the vacuum insulation material. The closer the linear thermal conductivity of the above vacuum insulation material is to 0 (zero), the better the heat insulation performance.

The above-mentioned vacuum heat insulating material is prepared by using the above-mentioned outer skin material for a vacuum heat insulating material as a barrier layer containing no metal film, thereby ensuring the linear thermal conductivity in the above range, thereby ensuring not only the barrier property above a predetermined level but also ensuring the barrier property. A significantly improved thermal insulation performance is obtained.

Referring to FIG. 2, the above vacuum insulation material 200 may further include a getter 50. The getter 50 remains in the interior of the vacuum insulation material, or is used to absorb new inflowing gas and moisture. For example, the getter 50 may include an alloy selected from the group consisting of calcium oxide (CaO), zeolite, lithium, and lanthanum (BaLi). At least one of the group consisting of cobalt oxide (CoO), barium oxide (BaO), and combinations thereof.

The getter 50 described above may be prepared in the form of a block or a rectangular parallelepiped shape, and may be included in the vacuum heat insulating material by a method of being inserted into the inside of the above core material 40.

The getter 50 may have a specific surface area of from about 1 m ² /g to about 100 m ² /g. For example, the getter 50 may have a specific surface area of from about 0.1 m ² /g to about 20 m ² /g. The specific surface area of the getter 50 satisfies the above range, and the moisture adsorption performance can be improved, and together with the above-mentioned outer skin material for a vacuum heat insulating material, it is possible to improve long-term durability and to secure appropriate mechanical properties.

Hereinafter, various specific embodiments of the present invention are proposed. However, the various embodiments described below are only intended to illustrate or illustrate the invention, and the invention should not be limited thereto.

Examples and comparative examples

Example 1

A core material having a size of 200 mm × 200 mm × 12 mm (length × width × thickness) was prepared by laminating glass fiber sheets having an average diameter of 2 μm. A 25 μm nylon film, a 12 μm polyethylene terephthalate (PET) film, a 12 μm biaxially oriented polyvinyl alcohol (BO-PVOH) film, and a 30 μm cast polypropylene were formed in this order from the outermost layer. (CPP) film outer skin material. Each film was bonded with a two-component adhesive of a urethane series. Next, 5 g of a getter prepared by placing calcium oxide (CaO) having a specific surface area of 4 m 2 /g and a purity of 95% in the bag was inserted into the surface of the above core material. Next, the core material was sealed with the above-mentioned outer skin material, and pressure-reduced at 4 Pa, thereby finally preparing a vacuum heat insulating material having a size of 200 mm × 200 mm × 8 mm (length × width × thickness).

Comparative example 1

A skin material obtained by laminating a 12 μm polyethylene terephthalate (PET) film, a 25 μm nylon film, a 7 μm aluminum foil, and a 50 μm linear low density polyethylene (LLDPE) film in this order from the outermost layer was used. Further, a vacuum insulation material was prepared in the same manner as in the above Example 1.

Comparative example 2

A 12 μm polyethylene terephthalate (PET) film in which a 25 μm nylon film was laminated in this order from the outermost layer, a 0.1 μm aluminum oxide film, and 12 μm ethylene oxide in which 0.1 μm of aluminum was deposited was used. A vacuum insulation material was prepared in the same manner as in the above Example 1, except that a sheath material of an alcohol (EVOH, ethylene vinyl alcohol) film and a cast polypropylene (CPP) film of 30 μm was used.

Evaluation

Experimental example 1 : Determination of water permeability

With respect to the outer skin materials for vacuum insulation materials of the above examples and comparative examples, a 24-hour period per square area was measured using a Aquatron apparatus of Mocon under the conditions of a temperature of 38 ° C and a relative humidity of 100%. The amount of water permeated, and the measured value of the measured value of water permeability.

Experimental example 2 : Determination of oxygen permeability

With respect to the outer skin materials for vacuum insulation materials of the above examples and comparative examples, the Oxygen apparatus of Memcom was used to measure oxygen permeation per square area for 24 hours under the conditions of a temperature of 23 ° C and a relative humidity of 0%. The amount and the oxygen permeability are extracted from the measured values.

Experimental example 3 : Determination of long-term durability

For each center portion of the vacuum insulation materials of the above-described examples and comparative examples, the initial thermal conductivity at room temperature was measured using a HC-074-200 (manufactured by EKO) apparatus in one day after preparation. Next, the thermal conductivity after leaving for 30 days was measured under the conditions of a temperature of 70 °C. The increase in thermal conductivity after 30 days with respect to the initial thermal conductivity described above was remitted.

Experimental example 4 : Determination of linear thermal conductivity

For the vacuum insulation materials of the above embodiments and comparative examples, one vacuum insulation material of 600×600×8 mm size and two vacuum insulation materials of 300×600×8 mm size were prepared, and passed through HC-074- of the company A 600 device was used to determine the linear thermal conductivity. Specifically, a vacuum insulation material of a size of 600×600×8 mm measures the thermal conductivity of a predetermined area in the center, and two vacuum insulation materials of a size of 300×600×8 mm are arranged side by side, so that after they are in contact with each other, the relative measurement is made. The thermal conductivity of a specified area near the contact surface. Thereafter, the measured thermal conductivity was used to calculate the linear thermal conductivity.

Table 1

Referring to the results of the above Table 1, it is understood that the vacuum insulation material of the above-described Example 1 is prepared by using a sheath material as a barrier layer not containing a metal film, and is in comparison with the existing metal-containing composites in terms of water permeability and oxygen permeability. 1 and Comparative Example 2 exhibited similar or more preferred barrier properties. Further, in the case of the above-described Example 1, it is understood that the thermal conductivity is increased in comparison with Comparative Example 1 and Comparative Example 2, and the long-term durability is excellent, and the linear thermal conductivity is remarkably low, and the thermal insulation performance is low. Obviously excellent.

100‧‧‧Veneer materials for vacuum insulation materials
200‧‧‧Vacuum insulation material
10‧‧‧ Sealing layer
20‧‧‧Barrier
30‧‧‧Protective layer
40‧‧‧ core material
50‧‧‧ getter

Fig. 1 shows a cross section of a sheath material for a vacuum insulation material according to an example of the present invention. Fig. 2 shows a vacuum insulation material of another example of the present invention.

100‧‧‧Veneer materials for vacuum insulation materials

200‧‧‧Vacuum insulation material

10‧‧‧ Sealing layer

20‧‧‧Barrier

30‧‧‧Protective layer

40‧‧‧ core material

50‧‧‧ getter

Claims (13)

A sheath material for a vacuum insulation material, comprising: a protective layer; a barrier layer which is not containing a metal film; and a sealing layer. The outer skin material for a vacuum insulation material according to claim 1, wherein the metal-free film is a biaxially oriented polyvinyl alcohol (BO-PVOH) film. The outer skin material for a vacuum insulation material according to claim 1, wherein the barrier layer has a thickness of from 10 μm to 30 μm. The outer skin material for a vacuum insulation material according to claim 1, wherein the protective layer comprises at least one selected from the group consisting of polyethylene terephthalate (PET), nylon, and a combination thereof. The outer skin material for a vacuum insulation material according to claim 1, wherein the protective layer has a thickness of from 5 μm to 20 μm. The outer skin material for a vacuum insulation material according to claim 1, wherein the sealing layer comprises a resin film having a melting point of from 125 ° C to 170 ° C. The outer skin material for a vacuum insulation material according to claim 1, wherein the sealing layer comprises a layer selected from the group consisting of cast polypropylene, linear low density polyethylene (LLDPE), and a combination thereof. At least one of the groups. The outer skin material for a vacuum insulation material according to claim 1, wherein the sealing layer has a thickness of from 25 μm to 60 μm. The outer skin material for a vacuum insulation material according to claim 1, wherein the moisture permeability of the outer skin material for the vacuum insulation material is 0.1 g/m ² •day at a temperature of 38 ° C and a relative humidity (RH) of 100%. the following. The requested item under vacuum insulation material 1 by the sheath material, wherein the temperature is 23 ℃ and a relative humidity conditions of 0%, the oxygen permeability of a vacuum insulation material of the sheath material 0.05cc / m ² • day or less. A vacuum insulation material, comprising: a core material comprising a glass fiber; and the outer skin material for a vacuum insulation material according to any one of claims 1 to 10, for accommodating the core material and for covering the vacuum insulation material The inside of the material is depressurized. The vacuum insulation material according to claim 11, wherein the glass fiber has an average diameter of 10 μm or less. The vacuum insulation material according to claim 11, wherein the vacuum insulation material has a linear thermal conductivity of 2 mW/mK or less.