KR20160113452A

KR20160113452A - Core material for vacuum insulation panel and vacuum insulation panel

Info

Publication number: KR20160113452A
Application number: KR1020150038896A
Authority: KR
Inventors: 김은주; 정승문; 이명; 김하나
Original assignee: (주)엘지하우시스
Priority date: 2015-03-20
Filing date: 2015-03-20
Publication date: 2016-09-29

Abstract

A core material for a vacuum insulator comprising a fiber sheet comprising macro-glass short fibers having an average diameter of 1 탆 to 3 탆 and a vacuum insulation material comprising the same.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core material for a vacuum insulation material and a vacuum insulation material.

A core material for a vacuum insulation material, and a vacuum insulation material.

The vacuum insulation material is a heat insulation material which exhibits heat insulation performance by using a vacuum and a low thermal conductivity property by decompressing the inside of the vacuum insulation material. The vacuum insulation material may include a cover material which can be generally realized in a panel form and vacuum-packs the core material and the core material . Generally, the vacuum insulation material uses glass fiber as a core material, and the glass fiber can be classified into short fiber or long fiber depending on the production method.

As the diameter of the glass fiber is small and the arrangement is horizontal, the heat insulating performance can be improved. The long fibers of the glass fiber are uniform in the diameter distribution and are horizontally arranged, but the diameter of the long fibers is not so small, and the heat insulating performance is not sufficient, and the long fibers having a small diameter are expensive and uneconomical.

In one embodiment of the present invention, there is provided a core for a vacuum insulation material which simultaneously realizes excellent heat insulation and excellent economical efficiency.

In another embodiment of the present invention, there is provided a vacuum insulator including the core for vacuum insulator.

In one embodiment of the invention, there is provided a core for vacuum insulation comprising a fiber sheet comprising macroscopic glass short fibers having an average diameter of about 1 [mu] m to about 3 [mu] m.

The fiber sheet may comprise about 50% by weight or more of the macro-glass short fibers.

The fibrous sheet may not contain an organic binder and an inorganic binder separately.

The length of the macroscopic short fiber may be from about 1 mm to about 3 mm.

The fiber sheet may further comprise micro-glass short fibers having an average diameter of about 0.1 탆 to about 0.8 탆.

The weight ratio of the macro-glass short fibers to the micro-glass short fibers may be from about 1: 0.01 to about 1: 1.

The thickness of the fibrous sheet may be from about 0.5 mm to about 2.0 mm.

The number of the fiber sheets may be 10 to 28.

The plurality of fiber sheets may be laminated by needling.

The porosity of the fibrous sheet can be from about 60% to about 80%.

The macroscopic glass staple fiber may include at least one selected from the group consisting of organic ultra-fine fibers, fumed silica powder, silica powder, pearlite powder, airgel powder, and combinations thereof.

In another embodiment of the present invention, there is provided a vacuum insulation material including the core material for the vacuum insulation material and the sheath material.

The vacuum insulation material may have a thermal conductivity in the thickness direction of about 1.0 W / mK to about 2.7 W / mK.

The core material for vacuum insulation material can simultaneously realize excellent heat insulation and excellent economy.

1 is a schematic cross-sectional view of a vacuum insulator according to another embodiment of the present invention.
Fig. 2 is a SEM photograph of a section of the core for vacuum insulator in the lateral direction of Example 2 of the present invention. Fig.
3 is a SEM photograph of a section of the core material for vacuum insulator according to the third embodiment of the present invention taken in the lateral direction.
4 is a SEM photograph of a cross section of the core material for vacuum insulator of Comparative Example 1 of the present invention in the lateral direction.
5 is a SEM photograph of a section of the core material for vacuum insulator of Comparative Example 1 of the present invention taken in the direction of the top surface perpendicular to the side surface.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. However, the present invention is not limited thereto, and the present invention is only defined by the scope of the following claims.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

In the drawings, the thickness is enlarged to clearly represent the layers and regions. In the drawings, for the convenience of explanation, the thicknesses of some layers and regions are exaggerated.

Hereinafter, the formation of any structure in the "upper (or lower)" or the "upper (or lower)" of the substrate means that any structure is formed in contact with the upper surface (or lower surface) of the substrate However, the present invention is not limited to not including other configurations between the substrate and any structure formed on (or under) the substrate.

Generally, the core material for a vacuum insulator can be produced, for example, by forming a sheet or a board using glass fiber having heat insulation performance. The glass fiber is processed into a sheet form while having a small average diameter If the array is horizontal, the insulation performance can be improved.

The long fibers of this glass fiber are, for example, glass fibers having an average length of about 5 mm to about 25 mm, and have a uniform diameter distribution, and are horizontally arranged when processed into a sheet form, while long fibers usually used have an average diameter of about 9 Mu] m to about 12 mu m, insufficient heat insulation performance, and long fibers having a small average diameter of about 5 [mu] m to about 9 [mu] m are uneconomical because they are very expensive. In addition, in the case of long fibers, in order to produce a sheet having a constant strength, the organic binder must be contained in a relatively larger amount, so that the vaporization phenomenon of the organic binder occurs more greatly in the vacuum packaging process, The heat conduction phenomenon by the binder increases, and the heat insulating performance may be deteriorated.

On the other hand, the short glass fiber glass fibers are, for example, glass fibers having an average length of about 1 mm to about 3 mm, which are small in diameter and low in cost, have a wide and nonuniform distribution of the diameter of short fibers that are usually used, The arrangement of the short fibers is randomly formed to deteriorate the heat insulating performance.

In the present specification, fibers which can be easily formed in a relatively horizontal arrangement when forming an average diameter of about 1 탆 to about 4 탆 and processed into a sheet form among short fibers are defined as macro fibers, Is defined as microfibers that are formed at a level of from about 0.1 microns to about 0.8 microns and are relatively more twisted between fibers.

Accordingly, in one embodiment of the present invention, the fiber sheet included in the core material for vacuum insulator includes macroscopic glass short fibers suitably small at an average diameter of about 1 탆 to about 3 탆, It is possible to easily form an arrangement horizontally, and at the same time to have an inexpensive cost, so that the heat insulating performance of the vacuum insulator core material can be effectively improved at low cost, Economical efficiency can be realized at the same time.

The fibrous sheet may comprise, for example, at least about 50% by weight of the macroscopic short fiber, and specifically about 60% to about 100% by weight, and more specifically about 60% By weight to about 90% by weight. By including it in the content within the above-mentioned range, it is possible to sufficiently form a horizontal arrangement when processing into a sheet form, and more excellent heat insulating property can be realized. For example, in the case of containing less than about 50%, specifically less than about 60%, the ratio of the micro-glass short fibers having a random arrangement in the processed fiber sheet is increased, and the effect of improving the heat insulation is not sufficient .

The fibrous sheet may not contain an organic binder and an inorganic binder separately. In other words, the macro-glass short fibers can form a more horizontal arrangement relative to the micro-glass short fibers, thereby realizing a high level of heat insulation. However, the macro- The organic binder and the inorganic binder may not be required to firmly adhere them.

Accordingly, since the vaporization phenomenon of the organic binder or the inorganic binder does not occur during the vacuum packaging process, the degree of vacuum of the vacuum insulation material can be realized at a higher level, and at the same time, a separate binder component is present in the core material for the vacuum insulation material The heat transfer due to conduction is further reduced, and the heat insulating performance can be further improved.

The organic binder may include, for example, an acrylic resin, a phenolic resin, and the like. The inorganic binder may include, for example, silica sol and the like, each of which may be an organic binder Or an inorganic binder.

The length of the macroscopic short fiber may be, for example, from about 1 mm to about 3 mm, but is not limited thereto.

The macroscopic glass staple fiber may include at least one selected from the group consisting of organic ultrafine fibers, fumed silica powder, silica powder, pearlite powder, airgel powder, and combinations thereof.

In one embodiment, the fibrous sheet may further comprise micro-glass short fibers having an average diameter of from about 0.1 microns to about 0.8 microns.

When the fiber sheet further comprises the microglass short fibers, the weight ratio of the macroglass short fibers to the microglass short fibers may be, for example, from about 1: 0.01 to about 1: 1, and specifically about 1: 0.01 to about 1: 0.67, and more specifically from about 1: 0.1 to about 1: 0.67. By including the macro-glass short fibers sufficiently in the above-mentioned range, it is possible to sufficiently form the horizontal arrangement when the sheet is processed into a sheet form, so that the core material for the vacuum insulation material can realize a high level of heat insulation.

The fiber sheet may comprise, for example, up to about 50% by weight of the micrographic staple fibers, specifically from about 0% by weight to about 40% by weight, and more specifically about 10% by weight % To about 40 wt%. By incorporating the low content within the above range, it is possible to realize the random arrangement of the glass short fibers at a sufficiently low level in the case of processing into the sheet form, and thus the heat insulating performance of the core material for vacuum insulator can be maintained at a good level.

The length of the microglass staple fibers may be, for example, from about 1 mm to about 3 mm, but is not limited thereto.

The porosity of the fibrous sheet can be from about 60% to about 80%. By having a porosity within the above range, the thermal conductivity due to conduction in the core of the vacuum insulation material can be lowered by vacuum packaging to improve the heat insulation performance. The curvature can be measured by, for example, a mercury porosimeter method, but is not limited thereto.

In one embodiment, the thickness of the fibrous sheet can be from about 0.5 mm to about 2 mm. By having a thickness of a thin level within the above range, the arrangement of the macro-glass short staple fibers can be formed more horizontally, thereby realizing more excellent heat insulating property.

The number of the fiber sheets may be 10 to 28. By including them in the above-mentioned range, it is possible to realize a heat insulating property which is sufficiently excellent without excessively increasing the thickness of the core material for vacuum insulator.

The plurality of fiber sheets may be laminated by needling.

The needling is a method different from needle punching in that, for example, another glass fiber sheet is placed on the upper surface of a glass fiber sheet, and a plurality of points are sewn on the edges of the glass fiber sheets by using needles. The number of points sewn and fixed at the edge portion may be, for example, four to twelve, but may be appropriately determined as the number required for fixing a plurality of glass fiber sheets, and is not particularly limited. In addition, the position of the point may be symmetrically formed at each vertex at the rim, but is not particularly limited.

In another embodiment of the present invention, there is provided a vacuum insulation material including the core material for the vacuum insulation material and the sheath material. The core material for the vacuum insulator is as described above in one embodiment. Fig. 2 schematically shows a cross-section of the vacuum insulator 100. Fig.

As described above, the vacuum insulating material 100 includes the macro-glass short fibers appropriately small to a level at which the average diameter of the fiber sheet included in the vacuum insulator core 110 is about 1 μm to about 3 μm When the glass fiber is processed into a sheet form, it can be easily arranged horizontally and at a low cost, and the heat insulating performance of the vacuum insulator core material can be effectively improved at a low cost, Accordingly, there is an advantage that excellent heat insulation and excellent economical efficiency can be realized at the same time.

In another embodiment, the vacuum insulator 100 may have a thermal conductivity in the thickness direction of, for example, from about 1.0 W / mK to about 2.7 W / mK, and more specifically from about 1.0 W / mK to about 2.0 W / Lt; / RTI > By having a sufficiently low thermal conductivity within the above range, the vacuum insulation panel 100 can exhibit excellent heat insulation properties.

The cover material 120 may be a multi-layer thin film structure in which an adhesive layer, a metal barrier layer and a protective layer are sequentially laminated. When the core material 110 is placed inside the envelope material 120 and then vacuum-packed The adhesive layer may be thermally welded to seal the core member 110. [

The adhesive layer can directly coat the core member 110, can be formed by heat welding by heat sealing, can function to maintain the vacuum state of the core member 110, , The adhesive layer may be formed of a thermoplastic plastic film which is easy to be thermally welded.

For example, the adhesive layer may be formed of a high density polyethylene (HDPE), a low density polyethylene (LDPE), a linear low density polyethylene (LLDPE), an unoriented polypropylene (CPP), a stretched polypropylene (OPP), a polyvinylidene chloride A thermoplastic resin containing at least one selected from the group consisting of vinyl chloride (PVC), ethylene-vinyl acetate copolymer (EVA), ethylene-vinyl alcohol copolymer (EVOH), and combinations thereof.

The adhesive layer may include calcium oxide as a moisture absorbent for adsorbing moisture and the like, and the adhesive layer may contact the core material 110 to adsorb moisture remaining in the core material 110, thereby improving the degree of vacuum In addition, it is possible to block the moisture permeating from the outside of the outer cover 120 during use, and to realize excellent durability for a long period of time.

The calcium oxide may be included in an amount of about 30 to about 40 wt% based on the total weight of the adhesive layer. By including it in the above-mentioned range, the adhesive strength can be maintained at a high level while realizing sufficient performance as a hygroscopic agent. The thickness of the adhesive layer may be from about 50 탆 to about 100 탆.

The metal barrier layer may be laminated on the adhesive layer to block the gas, protect the core member 110, and the metal barrier layer may be formed of a metal layer or a metal oxide layer. The thickness of the metal barrier layer may be from about 6 [mu] m to about 12 [mu] m.

In addition, a protective layer may be formed on the metal barrier layer to prevent a crack from occurring in the metal barrier layer when the shell member 120 is folded.

The protective layer may include at least one of a polyethylene terephthalate (PET) film, a nylon film, and a combination thereof, and may thus be formed as a single layer or a multilayer film. The thickness of the protective layer may be about 10 탆 to about 20 탆.

Further, a flame-retardant coating may be further formed on the upper surface of the outer cover 120 to realize excellent flame retardancy. The flame retardant coating may comprise a thermoplastic plastics material comprising a flame retardant.

The flame retardant may include, but is not limited to, at least one selected from the group consisting of phosphorus compounds of a non-halogen type, nitrogen compounds, aluminum hydroxide, antimony trioxide, and combinations thereof.

The phosphorus compound may be a phosphorus flame retardant such as phosphoric acid ester and the like, and the nitrogen compound may be a flame retardant such as melamine type, urea type, amine type or amide type. The flame retardant performance can be further enhanced by using the nitrogen compound and the phosphorus compound in combination.

The vacuum insulator 100 may further include a getter 130 to effectively absorb gas and moisture that may occur in the encapsulant 120 and the getter 130 may be used in the art Known types can be used without limitation.

The getter 130 may be included in the core material 110 or may be included between the core material 110 and the casing material 120.

Hereinafter, specific embodiments of the present invention will be described. It should be noted, however, that the embodiments described below are only intended to illustrate or explain the present invention, and the present invention should not be limited thereby.

Example

Example One

Macro-glass short fibers having an average diameter of 1.5 mu m and an average length of 1 mm; And micro-glass short fibers having an average diameter of 0.40 mu m and an average length of 1 mm, 28 pieces of the fiber sheets having 80% porosity are laminated, and then the four corners of the fiber sheets are fixed by needling, Was prepared.

In the fiber sheet, the weight ratio of the macro-glass short fibers to the micro-glass short fibers was 1: 0.67, the content of the macro-glass short fibers was 60% by weight, and the content of the micro-glass short fibers was 40%

Example 2 (when the content of macroscopic short fiber is smaller than that of Example 1)

Macro-glass short fibers having an average diameter of 3.0 mu m and an average length of 1 mm; And micro-glass short fibers having an average diameter of 0.40 mu m and an average length of 1 mm, 28 pieces of the fiber sheets having 80% porosity are laminated, and then the four corners of the fiber sheets are fixed by needling, Was prepared.

In the fiber sheet, the weight ratio of the macro-glass short fibers to the micro-glass short fibers was 1: 0.92, the content of the macro-glass short fibers was 52% by weight, and the content of the micro-glass short fibers was 48% by weight.

Example 3 (when the content of macroscopic short fiber is less than that of Example 2)

Macro glass short fibers having an average diameter of 1.55 mu m and an average length of 1 mm; And micro-glass short fibers having an average diameter of 0.40 mu m and an average length of 1 mm, 28 pieces of the fiber sheets having 80% porosity are laminated, and then the four corners of the fiber sheets are fixed by needling, Was prepared.

In the fiber sheet, the weight ratio of the macro-glass short fiber to the micro-glass short fiber was 1: 5.25, the content of the macro-glass short fiber was 16 wt%, and the content of the micro-glass short fiber was 84 wt%.

Comparative Example 1 (in the case of not including glass short fibers but including glass long fibers)

The same procedure and conditions as those of Example 1 were used except that glass short fibers were not included and glass long fibers having an average diameter of 13 탆 and an average length of 12 mm were contained and a fiber sheet having a porosity of 50% Was prepared.

The core material for the vacuum insulation material contained 5% of the organic binder by using the glass long fibers.

Comparative Example 2 (in the case of not including macro short glass fibers but including micro glass short fibers)

Except that the macro-glass short fibers were not included and the micro-glass short fibers having an average diameter of 0.5 탆 and an average length of 1 mm were used and a fiber sheet having a porosity of 60% was used, A core material for a vacuum insulator was prepared.

evaluation

Sectional view of the core material for vacuum insulators of Examples 1-3 and Comparative Example 1 taken in the side direction, that is, in the side direction, was taken by scanning electron microscope and shown in Figs. 2 to 4, The cross section in the direction of the top surface perpendicular to the side surface, that is, the direction of the top surface perpendicular to the side surface, was photographed by a scanning electron microscope and is shown in Fig.

The core materials for vacuum insulation materials of Examples 1-3 and Comparative Examples 1 and 2 were placed in a jacket material and vacuum-packed at the same degree of vacuum to prepare respective vacuum insulation materials. The properties of the vacuum insulation materials were evaluated, .

(Thermal conductivity)

Measurement method: Measured using a thermal conductivity meter (EKO, HC-074-200) at an average temperature of 20 ± 5 ° C according to the measurement conditions of KS L 9016).

(SEM image photograph)

Measurement method: Scanning was performed using a scanning electron microscope (HITACHI, SU-8010).

Thermal conductivity (W / mK) Example 1 1.7 Example 2 2.6 Example 3 2.7 Comparative Example 1 3.2 Comparative Example 2 3.0

As shown in Table 1, it is clearly expected that the core material of the vacuum insulation material according to Examples 1 to 3 has a low thermal conductivity, and in particular, the thermal conductivity is lower in Example 1, thereby realizing excellent heat insulation performance at low cost .

On the other hand, in the case of the core material of the vacuum insulation material according to the comparative example 1, as shown in FIG. 4, as shown in FIG. 4, as shown in FIG. 5, a binder is filled between the fibers, Therefore, it can be clearly predicted that the thermal conductivity is inferior due to the fact that the thermal conductivity is significantly increased to 3.2 W / mK.

In addition, in the case of the core material of the vacuum insulation material according to Comparative Example 2, it was clearly confirmed that the arrangement of the glass short fibers was randomly formed and the thermal conductivity was high.

100: Vacuum insulation
110: core material
120:
130: Getter

Claims

A core material for a vacuum insulator comprising a fiber sheet comprising macro-glass short fibers having an average diameter of 1 탆 to 3 탆.

The method according to claim 1,
Wherein said fiber sheet comprises at least 50%
Core for Vacuum Insulation.

The method according to claim 1,
Wherein the fiber sheet does not contain an organic binder and an inorganic binder separately
Core for Vacuum Insulation.

The method according to claim 1,
Wherein the length of the macroscopic short fiber is from 1 mm to 3 mm
Core for Vacuum Insulation.

The method according to claim 1,
Wherein the fiber sheet further comprises micro-glass short fibers having an average diameter of 0.1 mu m to 0.8 mu m
Core for Vacuum Insulation.

6. The method of claim 5,
Wherein the weight ratio of the macro-glass short fiber to the micro-glass short fiber is from 1: 0.01 to 1: 1
Core for Vacuum Insulation.

The method according to claim 1,
Wherein the thickness of the fiber sheet is 0.5 mm to 2.0 mm
Core for vacuum finishing.

The method according to claim 1,
Wherein the fiber sheet comprises 10 to 28
Core for Vacuum Insulation.

In the eighth aspect,
Wherein the plurality of fiber sheets are laminated by needling
Core for Vacuum Insulation.

The method according to claim 1,
Wherein the fiber sheet has a porosity of 60% to 80%
Core for Vacuum Insulation.

The method according to claim 1,
Wherein the macroglass staple fiber comprises at least one selected from the group consisting of organic microfine fibers, fumed silica powder, silica powder, pearlite powder, airgel powder, and combinations thereof
Core for Vacuum Insulation.

A vacuum insulator comprising a core material for a vacuum insulation material according to any one of claims 1 to 11 and a jacket material.

13. The method of claim 12,
A thermal conductivity in the thickness direction of 1.0 W / mK to 2.7 W / mK
Vacuum insulation.