KR101452211B1 - Core material for vacuum insulator and vacuum insulator using the same - Google Patents

Abstract

The present disclosure is directed 34 to a 59.9% of silica by weight, and comprises a 39 to 57% by weight of the inorganic powder and the reinforcing fibers of 1 to 7% by weight, the inorganic powder is a SiO ₂ content of more than 93%, Al ₂ O ₃ content And a cover material surrounding the core material, wherein the inside of the cover material is vacuum-sealed. The vacuum insulator comprises a core material for vacuum insulation material made of diatomaceous earth of 2% or less and a core material for the vacuum insulation material. The present disclosure also relates to a method of making a composite material comprising mixing 34 to 59.9 weight percent silica, 39 to 57 weight percent inorganic powder, and 1 to 7 weight percent reinforcing fibers to form a mixture; And compression-molding the mixture, wherein the inorganic powder comprises diatomaceous earth having a SiO ₂ content of 93% or more and an Al ₂ O ₃ content of 2% or less, and a method of manufacturing the core material for vacuum insulation material, Producing a core material for a vacuum insulator; Enclosing the core material with a jacket material; And a step of decompressing the inside of the jacket material and sealing the vacuum jacket. According to an aspect of the present invention, it is possible to maintain a low thermal conductivity property of a vacuum insulation material, thereby ensuring high heat insulation performance, and remarkably reducing manufacturing cost, and exert excellent effects in terms of handling property and workability at the time of manufacturing a core material. The efficiency of the process can be improved.

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 using the core material.

The present invention relates to a core material for a vacuum insulation material and a vacuum insulation material using the core material. More particularly, the present invention relates to a core material for a vacuum insulation material capable of improving handling properties, workability and durability, will be.

Vacuum insulation is a high performance insulation material that utilizes the low thermal conductivity of vacuum and can be applied to refrigerator, freezer, low temperature liquefaction tank, freezer container, cold / on vending machine, building panel and so on.

Generally, the vacuum insulation panel is made in the form of a panel having a certain thickness, which is also called a vacuum insulation panel. The vacuum insulator is a heat insulator having a core material serving as a spacer inserted into a sheathing material having gas barrier properties and sealing the interior by decompression, and has a very low thermal conductivity.

An organic core material such as a polyurethane foam or an inorganic core material such as glass fiber and silica is used as the vacuum insulation core.

However, since the polyurethane foam is an organic material, there is a problem that the vacuum degree and the heat insulation performance are deteriorated by outgassing in which gas is generated from the organic material in the vacuum over time, and since the foam is a foam, it is disadvantageous in terms of environmental friendliness There is also.

When glass fiber is used as an inner core material, there is a problem that the product condition and finishing property are lowered in vacuum packaging, and since the vacuum insulation material is manufactured by pressing at a high pressure, when leakage occurs in the internal vacuum, the glass fiber is restored to its original state, The expansion may cause structural problems in the applied product or building. In addition, there is a disadvantage in that durability is deteriorated due to occurrence of outgassing in the inside and the manufacturing time is long.

On the other hand, in the case of silica, the process of producing the powder in the form of a board is complicated and difficult, and dust and fine dust are generated in the manufacturing process, which poses problems in human health and environmental pollution. In addition, there is a problem in that the manufacturing cost is increased due to high material cost in the practical aspect, and there is a problem in that the insulation performance is poor due to the inability to absorb heat in the infrared region from the technical point of view.

The present invention can reduce the manufacturing cost while improving the heat insulating performance of the vacuum insulating material, improve the handling and workability of the powder during manufacturing of the core material, increase the mixing efficiency, and eliminate or minimize deterioration of the vacuum insulating material by outgassing To provide a core material for a vacuum insulation material capable of securing long-term durability and a vacuum insulation material using the same.

One aspect of the present invention for solving the above problems includes a 34 ~ of 59.9% by weight silica and 39 - 57% by weight inorganic powder, and 1 to 7% by weight reinforcing fibers, wherein the inorganic powder is a SiO ₂ content of 93 % Of Al ₂ O ₃ and 2% or less of Al ₂ O ₃ .

According to another aspect of the present invention, there is provided a vacuum insulation material comprising the core material for the vacuum insulation material and a casing material surrounding the core material, wherein the inside of the casing material is pressure-sealed.

According to another aspect of the present invention, there is provided a method for producing a composite fiber, comprising: mixing 34 to 59.9 wt% of silica, 39 to 57 wt% of inorganic powder, and 1 to 7 wt% of reinforcing fibers to form a mixture; And compressing and molding the mixture, wherein the inorganic powder is composed of diatomaceous earth having a SiO ₂ content of 93% or more and an Al ₂ O ₃ content of 2% or less. do.

According to another aspect of the present invention, there is provided a method of manufacturing a vacuum insulator, Enclosing the core material with a jacket material; And a step of decompressing and sealing the inside of the jacket material.

According to the present invention, by using an inorganic powder made of diatomaceous earth as a material of a core material together with silica so as to obtain an optimized effect in terms of thermal conductivity of a vacuum insulation material, moldability of a core material, efficiency of a manufacturing process, It is possible to maintain the thermal conductivity characteristic and to secure a high heat insulating performance while remarkably reducing the manufacturing cost, thereby exerting an excellent effect in terms of economy.

In addition, handling and workability of powders can be remarkably improved in manufacturing a core material of a vacuum insulation material, and the efficiency of the manufacturing process can be improved by increasing the mixing efficiency.

In addition, it is possible to prevent the generation of noxious gases and moisture by the outgassing, and to prevent the deterioration of the heat insulating performance due to the lowering of the vacuum degree, thereby improving the durability for the long term.

Further, by applying the infrared absorbent, heat transmission by infrared rays can be prevented, and the heat insulating performance can be further improved.

Furthermore, using environmentally friendly materials can reduce greenhouse gas emissions and maximize energy efficiency.

1 is a schematic view of a vacuum insulator according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

One aspect of the present invention is 34 ~ 59.9 relates to a core material for vacuum insulation material comprising by weight percent of silica, 39-57% by weight of an inorganic powder and 1-7% reinforcing fibers by weight and wherein the inorganic powder is SiO ₂ content Or more and 93% or more, and an Al ₂ O ₃ content of 2% or less.

Referring to FIG. 1, the core member 2 supports the envelope material 3 during the internal vacuum of the vacuum insulation material 1, maintains its shape and prevents movement of some remaining gas molecules, thereby minimizing heat transfer do.

In the present invention, by using an inorganic powder composed of diatomaceous earth having a SiO ₂ content of 93% or more and an Al ₂ O ₃ content of 2% or less together with silica as a core material of the vacuum insulation material as a filler, the heat insulation performance of the vacuum insulation material can be maintained , The handleability of the powder, the moldability and the workability can be improved and the powder coating on the inner wall of the mixer can be prevented and the mixing efficiency can be increased.

In addition, the inorganic powder used in the present invention has excellent compatibility with fumed silica as compared with other inorganic powders, so that the heat insulating performance of the vacuum heat insulating material can be further improved.

The inorganic powder is preferably contained in an amount of 39 to 57% by weight, more preferably 40 to 50% by weight, based on the total weight of the core material (2).

When the content of the inorganic powder is less than 39% by weight, the effect of lowering the production cost by substituting silica as the main constituent of the core material is insignificant in practical use, and the handleability and workability of the powder are inferior. %, The thermal conductivity of the vacuum insulation increases, and the heat insulating performance is deteriorated.

The inorganic powder preferably has a particle diameter of 12 탆 or more and a specific surface area of 3 m 2 / g or less.

When the particle diameter of the inorganic powder is less than 12 탆, the phenomenon that the fine powder is blown out during the process tends to occur, and the handleability and workability of the powder may be deteriorated. When the specific surface area of the inorganic powder is more than 3 m < 2 > / g, it is difficult to use the inorganic powder in combination with silica, which may result in deterioration of moldability and workability.

In the present invention, the silica is preferably contained in an amount of 34 to 59.9% by weight, more preferably 40 to 55% by weight based on the total weight of the core material (2).

When the content of silica is less than 34% by weight, the thermal conductivity of the vacuum heat insulating material is increased to deteriorate the heat insulating performance. When the content exceeds 59.9% by weight, it is difficult to be practically applied due to an excessive increase in manufacturing cost. There is a problem that the handling property and workability are inferior, the strength of the core material is lowered, and the formability is poor.

The silica may be selected from the group consisting of fumed silica, precipitated silica, and mixtures thereof.

The fumed silica can be prepared by any of the methods known in the art, for example, by reacting silicon tetrachloride, oxygen and hydrogen at a temperature close to 1000 ° C to produce a high purity fumed silica together with hydrogen chloride.

In one embodiment, the specific surface area of the fumed silica is preferably 200 to 400 m < 2 > / g.

When the specific surface area of the fumed silica is less than 200 m < 2 > / g, the thermal conductivity of the vacuum insulation increases and the heat insulating performance deteriorates. When the specific surface area exceeds 400 m & Occurs.

The precipitated silica can also be produced by a suitable method among those known in the art, for example, a precipitated silica can be produced by a wet method.

The precipitated silica has the advantages of low cost while maintaining the heat insulation performance of the fumed silica, but the specific gravity is larger than that of the fumed silica.

In one embodiment, the precipitated silica may preferably have a specific surface area of 150 to 250 m < 2 > / g.

When the specific surface area of the precipitated silica is less than 150 m < 2 > / g, the thermal conductivity of the vacuum insulation increases to deteriorate the heat insulating performance. When the specific surface area exceeds 250 m ≪ / RTI >

It is also preferred that the precipitated silica has a moisture content of 1 to 15% by weight.

Since the precipitated silica is produced by a wet process, the drying cost is large to maintain the moisture content to less than 1 wt%, and when the moisture content exceeds 15 wt%, the sedimented silica is poorly mixed with the fumed silica.

These silicas can be selected from the available products available on the market.

In one embodiment, the silica is a mixture of fumed silica and precipitated silica having a specific surface area of 150 to 250 m < 2 > / g, and the weight ratio of fumed silica to precipitated silica is preferably 95: 5 to 85:15.

When a mixture of fumed silica and precipitated silica is used as the core material, when the content of precipitated silica is less than the above range, it is difficult to expect a cost saving effect obtained by replacing the fumed silica with the precipitated silica, There is a possibility that molding of the core material becomes difficult due to the high specific gravity of the precipitated silica.

In the present invention, the reinforcing fibers serve to reinforce the strength of the core material and improve handling properties.

The reinforcing fibers are preferably contained in an amount of 1 to 7% by weight based on the weight of the core material (2).

If the content of the reinforcing fibers is less than 1% by weight, there is a problem that the handling strength of the core is not secured. When the content exceeds 7% by weight, the productivity is not increased due to an increase in manufacturing cost. There is a possibility of deterioration.

The reinforcing fibers may be one or more organic fibers or inorganic fibers and may be made of, for example, glass fibers, carbon fibers, nylon fibers, polyethylene terephthalate (PET) fibers, polypropylene (PP) fibers and polyvinyl alcohol At least one selected from the group consisting of

The reinforcing fibers preferably have a fiber diameter of 5 to 20 μm and a length of 6 to 25 μm.

If the fiber diameter and length are less than the above range, there is a possibility that the handling strength of the core material may not be sufficiently secured. If the fiber diameter and length are out of the above range, the mixing property with the silica and the inorganic powder may deteriorate and the composition of the core material may become uneven.

In one embodiment, the core material 2 of the vacuum insulator of the present invention may further comprise an infrared absorbing agent selected from the group consisting of graphite, carbon black and mixtures thereof in an amount of 0.1 to 2.0% by weight based on the total weight of the core material.

By including the infrared absorbent in this way, heat transmission due to infrared rays can be prevented, and the heat insulating performance of the vacuum insulating material can be further improved.

If the content of the infrared absorbing agent is less than the above range, the infrared absorbing effect may be insufficient. If the content of the infrared absorbing agent is more than the above range, there is a possibility that the compatibility with other core component components may be problematic.

The infrared absorbing agent may preferably have a particle size of 4 to 50 탆.

If the particle size of the infrared absorbing agent is less than 4 탆, there may be a problem in mixing with other core components. If the particle size exceeds 50 탆, the infrared ray wavelength can not be absorbed and the heat insulating performance of the vacuum insulating material may be deteriorated.

In one embodiment, the core 2 may be in the form of a compression molded platelet, and the density of the core 2 may range from 100 to 300 kg / m3.

When the density of the core material (2) is less than 100 kg / m3, there is a problem that the handling strength of the core material is not secured. When the density exceeds 300 kg / m3, the thermal conductivity of the vacuum insulation material increases, have.

According to another aspect of the present invention, there is provided a vacuum insulator (1) comprising the core material for vacuum insulation material (2) and a cover material (3) surrounding the core material, wherein the inside of the cover material (3) will be.

In the present invention, in order to obtain optimized effects in terms of the thermal conductivity of the vacuum insulation material, the formability of the core material, the manufacturing process efficiency, and the manufacturing cost, the selected silica, SiO ₂ content is 93% or more, Al ₂ O ₃ content is 2% Or less and a reinforcing fiber, it is possible to reduce the thermal conductivity of the vacuum insulation material to secure the heat insulation performance, to have excellent moldability, to have an excellent manufacturing process efficiency, and to have a practical advantage in terms of manufacturing cost A vacuum insulator can be provided.

In the present invention, the outer cover material (3) surrounds the core (2) and maintains an internal vacuum state to prevent permeation of moisture and air and seal the inside by heat fusion.

Therefore, the outer cover 3 is preferably made of a material having air permeability or water / gas barrier properties.

The sheath material usable in the present invention is not particularly limited as long as the characteristics of the vacuum insulation material are not impaired, and those known in the art can be suitably used.

In one embodiment, the sheathing may be a composite film that is basically laminated with several layers of film including a protective layer, a barrier layer, and a sealing layer.

The protective layer serves to primarily protect the vacuum insulation from external impacts. For example, the protective layer may be formed of a material such as a polyethylene terephthalate (PET) film, a nylon film, a polyester film, a polyethylene film, a polyvinyl chloride film, Vinylidene film, polystyrene film, and polypropylene film may be used alone or as a mixture of two or more thereof.

The barrier layer maintains an internal degree of vacuum and shields external gases and water vapor. For example, an aluminum evaporated film in which aluminum is deposited on a resin film such as a PET film, an aluminum foil on a resin film such as a PET film A laminated film or an aluminum foil or the like.

For example, the sealant layer may be formed of a material such as a linear low density polyethylene (LLDPE) film, a low density polyethylene (LDPE) film, a high density polyethylene (HDPE) CPP (Casting Polyethylene) film, or the like, or a mixture of two or more thereof.

The vacuum insulator 1 according to the present invention exhibits excellent heat insulating performance with a thermal conductivity of 0.006 W / mK or less and can lower the manufacturing cost and has a practical advantage as well as an optimized effect in terms of handling strength.

In another aspect of the present invention, there is provided a method for producing a composite material, comprising: mixing 34 to 59.9 wt% of silica, 39 to 57 wt% of inorganic powder, and 1 to 7 wt% of reinforcing fibers to form a mixture; And compression-molding the mixture, wherein the inorganic powder is composed of diatomaceous earth having a SiO ₂ content of 93% or more and an Al ₂ O ₃ content of 2% or less will be.

In this case, the mixing amount, type, BET specific surface area and length of the fumed silica, the inorganic powder and the fiber are selected so as to be optimized in terms of the thermal conductivity of the vacuum insulation material, the moldability of the core material and the manufacturing cost, As described above for the embodiment relating to silica.

The compression molding may be performed so that the core material is formed into a plate-like shape having a density of 100 to 300 kg / m < 3 >, and in one embodiment is spun at 0.5 to 10 minutes, preferably 0.8 to 3 minutes ≪ / RTI >

The plate shape of the core can be determined according to the shape and size of the final vacuum insulation.

According to another aspect of the present invention, there is provided a method of manufacturing a vacuum insulator, Enclosing the core material with a jacket material; And a step of decompressing the inside of the jacket material and sealing the vacuum jacket.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the following examples are illustrative of the present invention, and the scope of the present invention is not limited to the following examples.

Example

Example  One

Oxygen, and hydrogen were reacted at a temperature of about 1000 캜 to produce highly pure fumed silica together with hydrogen chloride. The effect of the thus prepared fumed silica BET specific surface area on the thermal conductivity was evaluated.

In order to evaluate the effect of the inorganic powder on the kind of the fumed silica, the fumed silica was mixed in an amount of 47.5 wt% of the core weight, the inorganic powder was 47.5 wt% of the core weight, the nylon fiber was 5 wt% Thereby forming the core of the vacuum insulation material. The core material was surrounded by an aluminum foil multilayer film, vacuum evacuated and sealed to form a vacuum insulation material. The vacuum degree and the thermal conductivity of the vacuum insulation material were measured, and the results are shown in Table 1 below.

Inorganic powder Diatomaceous earth Purite china clay Zeolite Vacuum degree (Torr) 5.45 x 10 ^-2 5.42 x 10 ^-2 5.46 x 10 ^-2 5.43 x 10 ^-2 Thermal conductivity (W / mK) 0.0052 0.0060 0.0072 0.0072

From the results shown in Table 1, it can be seen that when diatomaceous earth is used as the inorganic powder, the thermal conductivity of the vacuum insulation material is the lowest.

Particularly, from the viewpoint of handling at the time of production, it is preferable that the diatomite has a particle diameter of 12 mu m or more and a specific surface area of 3 m < 2 > / g or less. When the particle diameter of the inorganic powder is less than 12 탆, the phenomenon that the fine powder is blown out during the process tends to occur, and the handleability and workability of the powder may be deteriorated. When the specific surface area of the inorganic powder is more than 3 m < 2 > / g, it is difficult to use the inorganic powder in combination with silica, which may result in deterioration of moldability and workability.

Example  2

In order to investigate the influence of the particle size of the infrared absorbent on the thermal conductivity of the vacuum insulator, the thermal conductivity of the vacuum insulator was measured by varying the particle size using carbon black as the infrared absorber. As a core material, fumed silica having a specific surface area of 300 m < 2 > / g was used without an additional filler in order to understand the influence of the particle size of the infrared absorbing agent. The fumed silica was mixed in an amount of 94% by weight of the core material, the infrared absorbent in an amount of 1% by weight of the core material, the nylon fiber in an amount of 5% by weight of the core material, and pressed into a plate to form the core of the vacuum insulation material. The core material was surrounded by an aluminum foil multilayer film, vacuum evacuated and sealed to form a vacuum insulation material. The vacuum degree and the thermal conductivity of the vacuum insulating material were measured, and the results are shown in Table 2 below.

Carbon Black Particle Size (탆) 2 4 10 30 50 60 Vacuum degree (10-2 Torr) 5.45 5.42 5.43 5.44 5.44 5.43 Thermal conductivity (W / mK) 0.0065 0.0049 0.0048 0.0051 0.0050 0.0068

From the results shown in the above Table 2, it was confirmed that when the particle size of the carbon black is 4 to 50 μm, the thermal conductivity of the heat insulating material of the vacuum insulating material is lowered and the heat insulating performance is improved.

In particular, the carbon black may preferably have a particle size of 4 to 50 mu m. When the particle size of the carbon black is less than 4 mu m, there is a problem in mixing with constituent components. When the particle size exceeds 50 mu m, the infrared wavelength can not be absorbed and the heat insulating performance of the vacuum insulating material is lowered.

Example  3

On the basis of the preferred inorganic powder and infrared absorber according to the results of Examples 1 and 2 above, tests were carried out on precipitated silica to lower the production cost. After confirming the pore structure of the various silica by BET specific surface area measurement and SEM analysis, precipitated silica was selected from the viewpoint of replacement possibility for fumed silica. 47.5 wt% of fumed silica and diatomaceous earth, 1 wt% of carbon black having a particle size of 4 mu m, 5 wt% of nylon fiber, and precipitated silica having different contents were mixed and pressed into a plate to form a core of vacuum insulation. The total amount of fumed silica and precipitated silica was always maintained at 47.5% by weight and the core density was 200 kg / m 3. The core material was surrounded by an aluminum foil multilayer film, vacuum evacuated and sealed to form a vacuum insulation material. The thermal conductivity of the vacuum insulation material and the formability of the core material were measured according to the precipitated silica content, and the results are shown in Table 3 below. The formability was evaluated by visually observing the shape compressed in a plate form.

The precipitated silica (% by weight) 2 3 5 7 8 9 Fumed silica (wt.%) 45.5 44.5 42.5 40.5 39.5 38.5 Formability Great Great Good Good Bad Bad Thermal conductivity (W / mK) 0.0051 0.0052 0.0050 0.0051 - -

From the results in Table 3, it was confirmed that the ratio of replacing the fumed silica with the precipitated silica can be confirmed. Even if the amount of fumed silica was replaced with precipitated silica, the heat insulation performance of the vacuum insulation did not change, but it was confirmed that there was a problem in the formability when the substitution ratio was increased.

In particular, the weight ratio of fumed silica to precipitated silica is suitably from 95: 5 to 85:15. If the ratio is 95: 5 or less, the cost saving effect is insignificant. If the ratio is 85:15 or more, there is a problem in core molding.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments or constructions. Various changes, substitutions and alterations can be made hereto without departing from the spirit and scope of the invention. It will be clear to those who have knowledge.

1: vacuum insulation material 2: core material
3:

Claims (20)

34 to 59.9 wt.% Of silica, 39 to 57 wt.% Of inorganic powder, 1 to 7 wt.% Of reinforcing fibers, and 0.1 to 2.0 wt.% Of infrared absorbing agent,
The inorganic powder is composed of diatomaceous earth having a SiO ₂ content of 93% or more and an Al ₂ O ₃ content of 2% or less,
Wherein the infrared absorbent is graphite, carbon black, or a mixture of graphite and carbon black
Core for Vacuum Insulation.
The method according to claim 1,
Wherein the infrared absorbing agent has a particle size of 4 to 50 mu m
Core for Vacuum Insulation.
The method according to claim 1,
Wherein the silica is a mixture of fumed silica, precipitated silica, or fumed silica and precipitated silica
Core for Vacuum Insulation.
The method according to claim 1,
Wherein the silica is a mixture of fumed silica and precipitated silica having a specific surface area of 150 to 250 m < 2 > / g, wherein the weight ratio of fumed silica to precipitated silica is 95: 5 to 85:15
Core for Vacuum Insulation.
5. The method of claim 4,
Characterized in that the precipitated silica has a water content of 1 to 15% by weight
Core for Vacuum Insulation.
The method according to claim 1,
Wherein the reinforcing fiber is at least one selected from the group consisting of glass fiber, carbon fiber, nylon fiber, polyethylene terephthalate (PET) fiber, polypropylene (PP) fiber and polyvinyl alcohol (PVA)
Core for Vacuum Insulation. The method according to claim 1,
Wherein the reinforcing fibers have a fiber diameter of 5 to 20 mu m and a length of 6 to 25 mu m
Core for Vacuum Insulation.
A vacuum insulator comprising a core material for vacuum insulation material according to any one of claims 1 to 7 and a casing material surrounding the core material, wherein the inside of the casing material is pressure-sealed.
Mixing 34 to 59.9 weight percent silica, 39 to 57 weight percent inorganic powder, 1 to 7 weight percent reinforcing fiber, and 0.1 to 2.0 weight percent infrared absorbing agent to form a mixture; And
Compression molding the mixture,
The inorganic powder is composed of diatomaceous earth having a SiO ₂ content of 93% or more and an Al ₂ O ₃ content of 2% or less,
Wherein the infrared absorbent is graphite, carbon black, or a mixture of graphite and carbon black
Method of manufacturing core material for vacuum insulation.
10. The method of claim 9,
Wherein the infrared absorbing agent has a particle size of 4 to 50 mu m
Method of manufacturing core material for vacuum insulation.
10. The method of claim 9,
Wherein the silica is a mixture of fumed silica, precipitated silica, or fumed silica and precipitated silica
Method of manufacturing core material for vacuum insulation.
10. The method of claim 9,
Wherein the silica is a mixture of fumed silica and precipitated silica having a specific surface area of 150 to 250 m < 2 > / g, wherein the weight ratio of fumed silica to precipitated silica is 95: 5 to 85:15
Method of manufacturing core material for vacuum insulation.
13. The method of claim 12,
Characterized in that the precipitated silica has a water content of 1 to 15% by weight
Method of manufacturing core material for vacuum insulation.
10. The method of claim 9,
Wherein the reinforcing fiber is at least one selected from the group consisting of glass fiber, carbon fiber, nylon fiber, polyethylene terephthalate (PET) fiber, polypropylene (PP) fiber and polyvinyl alcohol (PVA)
Method of manufacturing core material for vacuum insulation.
10. The method of claim 9,
Wherein the reinforcing fibers have a fiber diameter of 5 to 20 mu m and a length of 6 to 25 mu m
Method of manufacturing core material for vacuum insulation.
16. A method of manufacturing a vacuum insulated core according to any one of claims 9 to 15,
Enclosing the core material with a jacket material; And
And a step of decompressing and sealing the inside of the envelope material
A method of manufacturing a vacuum insulation material. delete delete delete delete

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