JP2003042386A - Heat-insulating material, solidifying method therefor and apparatus using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solidify a highly efficient heat-insulating material exhibiting thermal conductivity equal to or lower than static air by a binder without deteriorating the heat-insulating property. SOLUTION: The heat-insulating material is produced by solidifying silica secondary particles 3 of an element heat-insulating material exhibiting the thermal conductivity equal to or lower than the static air with the usage of 10% to 30% of the binder 5. Thus, the heat-insulating material capable of being easily handled and exhibiting the high heat-insulating property, the solidifying method thereof and the apparatus with the usage of it can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating material which is solidified without deteriorating the heat insulating performance of a raw heat insulating material, a method for solidifying the heat insulating material and a device using the same.

[0002]

2. Description of the Related Art FIG. 10 shows the relationship between temperature and thermal conductivity of various heat insulating materials. Among various heat insulating materials, a heat insulating material such as xerogel and WDS (manufactured by Wacker) has a thermal conductivity smaller than that of still air and has a very high heat insulating property. In addition, these high-performance heat insulating materials are usually manufactured in the form of powder or particles.

As a conventional method of using the heat insulating material, there are a method in which a non-woven fabric is made into a bag shape, a method in which it is packed in a box-shaped resin container or a metal container and used, but it is formed into a complicated shape. There are problems that can not be done and heat that is transmitted through the metal container itself.

In order to solve these problems, there is a method of solidifying and using a heat insulating material. As a method for solidifying the heat insulating material, for example, a high performance heat insulating material called aerogel (including xerogel) having a thermal conductivity of about 30 mW / mK is solidified by using an inorganic binder. Things are known.

[0005]

However, in the method using the inorganic binder as used in the above-mentioned prior art, the thermal conductivity of the heat insulating material bonded by the inorganic binder is 15
It deteriorates to 0 mW / m · K and lowers its heat insulating property. This is because a large amount of binder deteriorates the heat insulation performance. Therefore, it is necessary to increase the strength even when the binder amount is reduced as much as possible. There is also a problem that the heat insulating performance of the heat insulating material has a large temperature dependency.

The present invention is intended to solve the above-mentioned problems of the prior art, and an object thereof is to provide a solidified heat insulating material which hardly deteriorates the heat insulating performance.

[0007]

In order to achieve the above-mentioned conventional objects, the heat insulating material of the present invention and its solidifying method solidify a raw heat insulating material having a thermal conductivity of still air or less with a binder. This makes it possible to obtain a heat-insulating material which is easy to handle and exhibits high heat-insulating performance, and can be applied to various devices.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The invention described in claims 1 to 5 is 10 wt.
% To 30 wt% of a solidified heat insulating material, specifically, the elementary heat insulating material is silica xerogel,
Further, the binder is a resin powder, particularly a thermosetting resin powder, and further, a filler which is bound or entangled with the raw heat insulating material or the binder is used.

As a result, a solidified heat insulating material having a heat conductivity equal to or lower than that of stationary air can be obtained, which is easy to handle, exhibits high heat insulating performance, and can be applied to various devices.

The invention described in claims 6 to 13 is defined by claim 1.
The method for solidifying a heat insulating material according to any one of items 1 to 5, wherein a heat insulating material that is easy to handle and exhibits high heat insulating performance can be obtained.

The invention as set forth in claim 14 is the first to fifth aspects.
A heat-insulating material according to any one of claims 1 to 6 or a heat-insulating material obtained by the method for solidifying a heat-insulating material according to any one of claims 6 to 13, which is an electric water heater,
It can be configured as a heating device such as a jar rice cooker, a microwave oven, and a fish roaster, or a device such as a cool box and a warm box, and other devices.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) A first embodiment of the present invention will be described below.

Among various heat insulating materials, xerogel and WDS
An insulating material such as (made by Wacker) has a thermal conductivity smaller than that of still air and has a very high insulating performance.
These can be used by making a bulk body at the time of making the heat insulating material or solidifying the finished raw heat insulating material by compression molding or the like. In particular, a xerogel produced by using supercritical drying in a xerogel drying step is called an aerogel, and it is possible to produce a bulk body, but its strength is very weak, which is not practical. Also, WDS and the like can be molded and solidified by compression, but their use is limited because their strength is weak.

Next, the xerogel will be briefly described with reference to FIG. The xerogel is obtained by gelating water glass or a metal alkoxide such as tetramethoxysilane under a certain condition and evaporating and drying the solvent inside.
What is normally dried with hot air shrinks due to the surface tension of the solvent when it dries, and does not function as a heat insulating material. However, supercritically dried ones, gel surface hydrophobized, further substituted with a solvent such as toluene, acetone or hexane, and dried with hot air, the surface tension hardly works, as shown in the figure. The silica primary particles 1 having a diameter of about 1 to 10 nm are aggregated, and 40 to 100 n
It becomes an aggregate having a distance 2 between particles of about m. Therefore, the interparticle distance 2 forms pores and becomes a porous body. Since this 40 to 100 nm is about the same size as the mean free path of air molecules, heat conduction due to collisions between air molecules becomes small, and xerogel exhibits high heat insulation performance.
Then, the aggregate of the silica primary particles 1 forms the silica secondary particles 3 having a size of about 1 μm to 10 mm, as shown in FIG. This becomes a powder or granular heat insulating material.

Next, a method for solidifying the heat insulating material will be described. Although there are many methods for solidifying a powdery substance using a binder, it is very difficult to solidify while maintaining high heat insulation performance. If you put too much binder in it,
This is because the heat insulating performance is extremely lowered, and when the amount of the binder is reduced, the strength of the heat insulating material which is not solidified or solidified is small. Therefore, the ratio of the binder to the heat insulating material, the particle size of the binder, etc. are important factors.

FIG. 2 shows a state in which the powdery binder 4 and the silica secondary particles 3 as the elementary heat insulating material are mixed. As a mixing method, the silica secondary particles 3 and the binder 4 are mixed in the same container, and mixed using a mixer, a mix rotor or the like so as to be as uniform as possible.

As the binder 4, there are resin binders such as phenol resin, silicone resin, polyethylene and polypropylene, and inorganic binders such as sodium silicate powder and phosphate powder. It is better to use a resin binder
Pressure molding and injection molding are possible, good moldability,
According to the shape of the mold, it can be solidified into a free shape, and a molded product with appropriate flexibility can be obtained.

A resin binder is used as the binder 4, and after mixing with the silica secondary particles 3, it is put into a mold and heated to melt the binder 4, so that the silica secondary particles 3 are solidified and a heat insulating material can be molded. At this time, the mold may or may not be pressed. FIG. 3 is an enlarged view of a part of the heat insulating material after solidification. That is, the binder 4 melts and deforms to become the binder 5, which binds the silica secondary particles 3 to each other.

At this time, when a thermosetting resin such as a phenol resin or a silicone resin is used as the binder 4, the heat insulating material after solidification can be used without losing its shape even at a high temperature of about 300 ° C. .

The average particle size of the powdery binder 4 is preferably as small as possible, and at least smaller than the average particle size of the silica secondary particles 3. This is to improve the dispersibility of the binder 4 and facilitate more uniform mixing. If the particle size of the binder 4 is extremely large, the binder 6 deformed as shown in FIG.
This is because the binder 6 deformed by heat has the same thickness as the secondary silica particles 3 and heat flows through the binder 6, deteriorating the heat insulating performance of the solidified heat insulating material. .

The mixing ratio of the binder 4 and the silica secondary particles 3 is not particularly limited, but is preferably about 5 wt% to 50 wt% of the binder, and practically 10 wt%.
% To 30 wt% is preferable. When the amount of the binder is increased, the binders 7 are entangled with each other as shown in FIG. 5, and heat flows through the binder 7, so that the heat insulation performance is deteriorated. Also,
When the amount of the binder is reduced, it cannot be solidified or the strength becomes low.

As shown in FIG. 6, by further adding a filler 9 to the silica secondary particles 3 and the binder 4 (here, 8), it is possible to increase the strength without deteriorating the heat insulation performance. At this time, as the filler 9, the binder 8 is used.
A fibrous material is preferable so as to be entangled with. Even if the silica secondary particles 3 as the elementary heat insulating material are not bound to each other by the binder 8, the binders 8 bound to the silica secondary particles 3 can be bound by the filler 9, resulting in the silica secondary particles. Since the particles 3 can be bound, the strength can be increased by adding the filler 9. Moreover, the amount of the filler 9 to be added is not particularly limited.

As the fibrous filler 9, there are glass fiber, polyester fiber, metal fiber, kinol fiber, carbon fiber and the like. Especially, when glass fiber or kinol fiber is used, solidified heat insulating material is used at high temperature. Furthermore, since they have lower thermal conductivity than metal fibers, they are optimal for use as heat insulating materials. Further, when carbon fibers are used, infrared rays are absorbed, so that the heat insulating performance at high temperatures can be further improved.

Further, a substance that reflects infrared rays, such as a metal oxide represented by titanium oxide, ATO (antimony oxide-doped tin oxide), ITO (indium oxide-doped tin oxide), or the like is mixed, pulverized coal, carbon black, or the like. If a substance that absorbs infrared rays is mixed, the heat insulation performance at high temperatures can be further improved.

An example of an experiment relating to solidification of the elementary heat insulating material will be shown below.

<Experimental Example 1> An average particle size of 40 μm is applied to the raw heat insulating material.
Silica xerogel powder (hereinafter referred to as xerogel in this example) was selected, and phenolic resin BELLPEARL (manufactured by Kanebo) was selected as the binder.

A mixture of 6 g of xerogel and 0.3 g of bell pearl (hereinafter referred to as sample 1 in this example), a mixture of 6 g of xerogel and 0.7 g of bell pearl (hereinafter referred to as sample 1 in this example) Sample 2), 6 g of xerogel and 1 g of bell pearl mixed in a mixer (hereinafter, referred to as sample 3 in this example), 6 g of xerogel and 2.4 g of bell pearl mixed in a mixer (hereinafter, in this example Sample 4), 6 g of xerogel and 6 g of bell pearl mixed with a mixer (hereinafter, referred to as sample 5 in this example), 6 g of xerogel and 12 g of bell pearl mixed with a mixer (hereinafter, sample 6 in this example). 6g of heat insulating material packed in polyethylene terephthalate non-woven fabric (hereinafter It was prepared as sample 7) in the present embodiment.

Samples other than sample 7 were
The mold was placed in a 10 cm square mold, and the mold was sandwiched between a heater and a stainless steel plate with a built-in water cooling device. At this time, almost no pressure was applied to the mold. After that, turn on the heater and gradually raise the mold temperature to about 40
Heated to 200 ° C. in minutes. And 200 for about 10 minutes
The temperature was maintained at 0 ° C, and the temperature was cooled to room temperature by a water cooling device in about 15 minutes. Then, the mold was opened and each sample was taken out. Sample 1 was not solidified. Sample 1
The thermal conductivity of solidified heat insulating materials other than was measured, and the strength was confirmed. The results are shown in (Table 1).

[0030]

[Table 1]

From the above, it is possible to solidify the binder by adding about 10% by weight or more. In addition, when the binder is added in the range of approximately 14 wt% to 30 wt%,
The powdery heat insulating material can be solidified with almost no deterioration in heat insulating performance.

<Experimental Example 2> Average particle size of 40 μm for the raw heat insulating material
Silica xerogel powder (hereinafter referred to as xerogel in this example) is selected, and three binders, namely, pearl pearl (made by Kanebo) which is a phenol resin, silicone resin, and flow beads (made by Sumitomo Seika) which are high density polyethylene are selected. It is.

A mixture of 6 g of xerogel and 1 g of bell pearl (hereinafter referred to as phenol product in this embodiment), a mixture of 6 g of xerogel and 1 g of silicone resin (hereinafter referred to as silicone product in this embodiment) ), A mixture of 6 g of xerogel and 1 g of flow beads in a mixer (hereinafter, referred to as HDPE product in this example) was prepared.

Each sample was placed in a 10 cm square die, and the die was sandwiched between a heater and a stainless steel plate with a built-in water cooling device. At this time, almost no pressure was applied to the mold. Then turn on the heater,
Gradually raise the mold temperature. For phenol and silicone products, heat up to 200 ° C in about 40 minutes and
The temperature was maintained at 200 ° C. for 0 minutes, and the temperature was cooled to room temperature by a water cooling device in about 15 minutes. The HDPE product was heated to 150 ° C. in about 30 minutes, maintained at 150 ° C. for about 10 minutes, and cooled to room temperature in about 15 minutes by a water cooling device.

Then, the mold was opened and each sample was taken out. The heat conductivity of each solidified heat insulating material sample was measured, and after that, the heat insulating material sample was put into a constant temperature bath at 250 ° C. for 10 days, and then its strength and heat conductivity were measured. The results (Table 2)
Shown in.

[0036]

[Table 2]

The silicone product and the phenol product maintained the same strength even after the heat resistance test, and the heat insulation performance was not deteriorated. The HDPE product could not retain its shape after the heat resistance test, but the heat insulating performance was not deteriorated. Therefore, by using a thermosetting resin such as phenol resin or silicone resin, the solidified heat insulating material can be used even at high temperature.

<Experimental Example 3> An average particle size of 40 μm was applied to the raw heat insulating material.
Silica xerogel powder (hereinafter referred to as xerogel in this example) was selected, and phenolic resin BELLPEARL (manufactured by Kanebo) was selected as the binder. Furthermore, as a filler,
I chose glass fiber.

A mixture of 6 g of xerogel and 1 g of bell pearl (hereinafter referred to as a product without filler in this embodiment), 6 g of xerogel and 1 g of bell pearl were mixed with a mixer, and 0.33 g of glass fiber was added,
What was mixed in a mixer (hereinafter, referred to as a 5% filler product in this example), 6 g of xerogel and 1 g of bell pearl were mixed in a mixer, and 1.5 g of glass fiber was further added and mixed in a mixer (hereinafter In this embodiment, 6 g of xerogel and 1 g of bell pearl were mixed in a mixer, 3 g of glass fiber was further added, and mixed in a mixer (hereinafter, referred to as a 30% filler product in this embodiment). ), 6 g of xerogel and 1 g of bell pearl are mixed with a mixer, and further 7 g of glass fiber
What was added and mixed in a mixer (hereinafter referred to as a 50% filler product in this example), 6 g of xerogel and 1 g of bell pearl were mixed in a mixer, and further 1 glass fiber was added.
4 g was added and mixed with a mixer (hereinafter, referred to as 67% filler product in this example).

Each sample was placed in a 10 cm square die, and the die was sandwiched between a heater and a stainless steel plate with a built-in water cooling device. At this time, almost no pressure was applied to the mold. Then turn on the heater,
The temperature of the mold was gradually raised, and the temperature was raised to 200 ° C. in about 40 minutes. Then, the temperature was maintained at 200 ° C. for about 10 minutes, and it was cooled to room temperature by a water cooling device in about 15 minutes. Then, the mold was opened and each sample was taken out. The thermal conductivity of the solidified heat insulating material was measured, and its strength was confirmed. The results are shown in (Table 3).

[0041]

[Table 3]

Therefore, the strength can be increased by adding the filler.

<Experimental Example 4> An average particle diameter of 40 μm was applied to the raw heat insulating material.
Silica xerogel powder (hereinafter referred to as xerogel in this example) was selected, and a phenol resin was selected as a binder.

The average particle diameters of the phenol resin are 20 μm, 40 μm, 80 μm, 200 μm and 500 μm, respectively.
m and 1000 μm were prepared.

6 g of xerogel and 1 g of a phenol resin having an average particle size were mixed in a mixer (hereinafter, in this example, 20 products, 40 products, 80 products and 200 products, respectively).
Products, 500 products, 1000 products).

Each sample was placed in a 10 cm square mold, and the mold was sandwiched between a heater and a stainless steel plate with a built-in water cooling device. At this time, almost no pressure was applied to the mold. Then turn on the heater,
The temperature of the mold was gradually raised, and the temperature was raised to 200 ° C. in about 40 minutes. Then, the temperature was maintained at 200 ° C. for about 10 minutes, and it was cooled to room temperature by a water cooling device in about 15 minutes. Then, the mold was opened and each sample was taken out. The thermal conductivity of the solidified heat insulating material was measured, and its strength was confirmed. The results are shown in (Table 4).

[0047]

[Table 4]

Therefore, when the average particle size of the binder is smaller than the average particle size of the raw heat insulating material, the heat insulating performance of the solidified heat insulating material is high.

<Experimental Example 5> An average particle size of 40 μm was applied to the raw heat insulating material.
Silica xerogel powder (hereinafter referred to as xerogel in this example) was selected, and phenolic resin BELLPEARL (manufactured by Kanebo) was selected as the binder. Titanium oxide was selected as a substance that reflects infrared rays, and carbon black was selected as a substance that absorbs infrared rays.

Polyethylene terephthalate non-woven fabric filled with 6 g of heat insulating material (hereinafter referred to as powder product in this embodiment), 6 g of xerogel and 1 g of bell pearl mixed with a mixer (hereinafter referred to as solid product in this embodiment) ),
6 g of xerogel, 1 g of bell pearl and 0.8 g of titanium oxide
Mixed with a mixer (hereinafter, referred to as a solidified reflector in this embodiment), 6 g of xerogel and 1 g of bell pearl.
And a mixture of 0.8 g of carbon black in a mixer (hereinafter, referred to as absorbent solidified product in this example) were prepared.

For each sample other than the powdered product, 10
It was put into a cm square mold, and the mold was sandwiched between a heater and a stainless steel plate with a built-in water cooling device. At this time, almost no pressure was applied to the mold. Then, the heater was turned on, the temperature of the mold was gradually raised, and the temperature was raised to 200 ° C. in about 40 minutes. Then, the temperature was maintained at 200 ° C. for about 10 minutes, and it was cooled to room temperature by a water cooling device in about 15 minutes. Then, the mold was opened and each sample was taken out. Then, the thermal conductivity at room temperature and the thermal conductivity at 70 ° C. of the powder product and each solidified heat insulating material were measured. The results are shown in (Table 5).

[0052]

[Table 5]

Therefore, those to which the infrared reflecting agent and the absorbing agent are added can exhibit high heat insulating performance at high temperature.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings. By using the solidified heat insulating material shown in Example 1 for a heating device such as an electric water heater, a jar rice cooker, a microwave oven, and a fish roaster, it is possible to contribute to achieving significant energy saving.

An example of applying the solidified heat insulating material to an electric water heater will be described below. In FIG. 7, reference numeral 21 denotes a main body of the electric water heater (hereinafter simply referred to as a main body), which has a water storage container 22 (hereinafter simply referred to as a container 22) having an inner diameter of 184 mm and a depth of 200 mm for storing water therein. Two
Reference numeral 3 is an inner plug adapted to seal the mouth of the container 22. Reference numeral 24 is an upper lid that covers the upper portion of the main body 21 so as to be openable and closable. Reference numeral 25 denotes a vapor passage provided in the upper lid 24, one end of which penetrates the inside plug 23 to communicate with the inside of the container 22, and the other end of which communicates with the atmosphere. A water leakage prevention valve 26 is arranged in the steam passage 25, and shuts off the steam passage 25 when it falls. Here, the steam passage 2
5 is complicatedly bent. As a result, when the pressure inside the container 22 becomes higher than that in the atmosphere, such as when the water in the container 22 boils, steam passes through the steam passage 25 and the main body 2
However, the outside air does not easily mix with the air between the water surface in the container 22 and the upper lid 24 (hereinafter referred to as the inside air).

27 is a motor provided at the bottom between the main body 21 and the container 22, 28 is a pump driven by the motor 27, and its suction port 29 communicates with the bottom of the container 22. A discharge port 30 of the pump 28 communicates with the hot water outlet pipe 31. Reference numeral 32 denotes a hot water outlet from which the hot water is discharged to the outside of the electric water heater. Therefore, the hot water outlet path is from the container 22 to the suction port 29, the pump 28, the discharge port of the pump 28,
It passes through the tap pipe 31 and becomes a tap 32. Reference numeral 33 denotes a heater for heating, which has a doughnut-shaped central portion and is attached to the lower portion of the container 22. Reference numeral 34 is a temperature detector for detecting the hot water temperature. Reference numeral 35 is a start switch for driving the motor 27, which has a variable resistor, and has a push button 36.
It is operated via the rod 37 by the push operation switch of. 38 is a compression type spring.
Always urges the rod 37 to be pushed upward. Reference numeral 39 is a control device, which takes in a signal from the temperature detector 34 and controls the heater 33 and the like. 40 is container 2
The heat of the container 22 is heat insulating material that covers the side surface of the main body 21.
Plays a role in suppressing the escape from the side.

As the heat insulating material 40, the silica xerogel solidified in the first embodiment is used. Due to the solidification of Example 1,
A three-dimensional solid shape can be freely created. Therefore, a solidified heat insulating material having a shape that fits the container 22 from which the heater 33, the temperature detector 34, and the suction port 29 at the bottom of the container 22 are removed was produced. If a thermosetting resin is selected for the binder, the vicinity of the heater 33 can be covered with a heat insulating material.

The operation of this embodiment will be described below. Container 2
When water is put into 2 and then energized, the temperature of the water in the container 22 is measured by the temperature detector 34 and a signal thereof is sent to the controller 39, and the controller 39 starts energizing the heater 33. When the water in the container 22 boils, the power supply to the heater 33 ends. After that, in response to the signal from the temperature detector 34, the control device 39 controls the heater 33 so that the temperature of the container 22 becomes substantially constant. When tapping, the push button 36 is pushed. The motor 27 operates and the water in the container 22 is pumped by the pump 2
8, the water passes through the hot water outlet pipe 31 and is discharged from the hot water outlet 32 to the outside of the electric water heater for use.

An experimental example of the heat insulating property of the solidified heat insulating material will be shown below.

<Experimental Example 6> An average particle size of 40 μm was applied to the raw heat insulating material.
Silica xerogel powder (hereinafter referred to as xerogel in this example) was selected, and phenolic resin BELLPEARL (manufactured by Kanebo) was selected as the binder. Titanium oxide was selected as the substance that reflects infrared rays, and glass fiber was selected as the filler.

6 g of xerogel, 1 g of bell pearl, 0.33 g of glass fiber and 0.8 g of titanium oxide were mixed in a mixer, placed in a mold and heated to solidify. An electric water heater having this solidified heat insulating material (hereinafter referred to as having a heat insulating material in this embodiment) and an electric water heater having no heat insulating material (hereinafter referred to as having no heat insulating material in this embodiment) are prepared. Then, water was put into these electric water heaters, and the heat insulation power of each was measured. The temperature of the heat retaining water was 96.5 ° C and the ambient temperature was 20 ° C. The measurement was performed after reaching a sufficient equilibrium state. Experimental results (Table 6)
Shown in.

[0062]

[Table 6]

Therefore, the heat insulating power of the electric water heater can be greatly reduced by using the solidified heat insulating material.

In the present embodiment, the electric water heater is described as the heating device, but the heating device is not limited to this, and it can be configured as a device such as a cool box or a warm box, or another device. is there.

[0065]

As described above, according to the invention described in claims 1 to 14, it is possible to provide a heat insulating material which is easy to handle and has high heat insulating performance, a solidification method thereof, and a device using the same.

[Brief description of drawings]

FIG. 1 is an enlarged schematic view of a part of a silica xerogel in Example 1 of the present invention.

FIG. 2 is an enlarged view showing a state in which a raw heat insulating material and a binder are mixed in Example 1 of the present invention.

FIG. 3 is an enlarged schematic view of a part of the solidified heat insulating material in Example 1 of the present invention.

FIG. 4 is an enlarged schematic view of a part of an inappropriate heat insulating material according to the first embodiment of the present invention.

FIG. 5 is an enlarged schematic view of a part of a heat insulating material showing another inappropriate example in the first embodiment of the present invention.

FIG. 6 is an enlarged schematic view of a part of a heat insulating material using a filler in Example 1 of the present invention.

FIG. 7 is a vertical sectional view of an electric water heater according to a second embodiment of the present invention.

FIG. 8 is a characteristic diagram showing heat insulating performance of various conventional heat insulating materials.

[Explanation of symbols]

1 Silica primary particles 2 Distance between particles 3 Elementary heat insulating material (silica secondary particles) 4-8 binder 9 Filler 22 Water storage container 33 heater 40 insulation

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takashi Hashida             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Masaaki Suzuki             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F term (reference) 3E067 BB14A CA18 FC01 GA01                       GA06 GA11                 3H036 AA08 AA09 AB15 AB18 AB23                       AB24                 3L102 JA01 MB17                 4B055 AA32 BA23 FB12 FC11 FD10

Claims (14)

[Claims] 1. A heat insulating material which is solidified by using a binder of 10 wt% to 30 wt% with respect to an elementary heat insulating material having a thermal conductivity of still air or less. 2. The heat insulating material according to claim 1, wherein the elementary heat insulating material is silica xerogel. 3. The heat insulating material according to claim 1, wherein the binder is resin powder. 4. The heat insulating material according to claim 1, wherein the binder is a thermosetting resin powder. 5. The filler according to claim 1, wherein the filler is bound or entangled with an elemental heat insulating material or a binder.
Insulation according to item. 6. A method of solidifying a heat insulating material, wherein a material heat insulating material is bonded and solidified by using a binder so that the heat conductivity of the solidified heat insulating material is equal to or lower than the heat conductivity of stationary air. 7. The method for solidifying a heat insulating material according to claim 6, wherein the elementary heat insulating material is silica xerogel. 8. The method for solidifying a heat insulating material according to claim 6, wherein the binder is resin powder. 9. The method for solidifying a heat insulating material according to claim 6, wherein the binder is a thermosetting resin powder. 10. The method for solidifying a heat insulating material according to claim 6, wherein the diameter of the binder is smaller than the particle diameter of the raw heat insulating material before solidification. 11. The method for solidifying a heat insulating material according to claim 6, wherein a filler that binds or is entwined with the raw heat insulating material or the binder is used. 12. The method for solidifying a heat insulating material according to claim 11, wherein at least one of glass fiber, kinol fiber, and carbon fiber is used as the filler. 13. The method according to claim 6, further comprising at least one of a substance that reflects and absorbs infrared rays.
13. The solidification method of the heat insulating material according to any one of 12 above. 14. A heat insulating material according to any one of claims 1 to 5 or a heat insulating material obtained by the method for solidifying a heat insulating material according to any one of claims 6 to 13 is used. machine.