JP2001099393A - Heat insulating material, manufacture thereof and heat insulating box body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a bad effect on a heat insulating characteristic by binder components by using porous body granule excellent in heat insulating performance and provide a heat insulating material and a heat insulating box body having an excellent heat insulating property. SOLUTION: This heat insulting material is one made of porous body granule 5 having a diameter of 10 mm or below and resin film 6 coating porous body granule 5. Porous body granule 5 is characterized by adhering to adjacent porous body granule 5 at only the contact by resin coating the surface and forming molding body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a refrigerator, a freezer,
The present invention relates to a heat insulating material used for building materials and the like, a method of manufacturing the heat insulating material, and a heat insulating box filled with the heat insulating material.

[0002]

2. Description of the Related Art In recent years, energy saving has been demanded due to the importance of preventing global warming, which is a global environmental problem, and energy saving has been promoted for consumer appliances. In particular, with respect to equipment and houses utilizing hot and cold heat, a heat insulating material having excellent heat insulating properties is required from the viewpoint of efficiently using heat.

As a general heat insulating material, a fibrous body such as glass wool or a foamed body such as urethane foam is used. However, in order to improve the heat insulating properties of these heat insulating materials, it is necessary to increase the thickness of the heat insulating materials. There is a limit to the space where the heat insulating material can be filled, so that it cannot be applied when space saving or effective use of space is required.

Therefore, for example, Japanese Patent Application Laid-Open No. 7-138375
In the publication, a porous body of silica obtained by supercritically drying a gel compound using alkoxysilane as a raw material is disclosed. The pore diameter of the pores is 100 nm or less. It is known to be obtained.
In this method, if the pore size is less than the mean free path of the gas,
This is based on the phenomenon that the thermal conductivity of gas decreases.

The heat insulating material obtained by the above technique has a lower thermal conductivity than general-purpose heat insulating materials such as glass wool and urethane foam, and shows high heat insulating properties even at the same thickness.

In order to obtain a porous silica material, a gel compound is formed from alkoxysilane as a raw material, and then dried.

[0007] In the gel-like compound, a solvent is filled in the voids of the network skeleton in the gel. When such a gel is dried by natural drying, heat drying or drying under reduced pressure,
Since the gas-liquid interface exists in the void, when the gas-liquid interface recedes into the gel, the gel contracts due to the meniscus retreat stress caused by the surface tension. Therefore, in order to eliminate the shrinkage, a supercritical drying method is used in which the solvent is brought into a critical state where a gas and a liquid cannot be distinguished, and the solvent is dried without a gas-liquid interface in the network skeleton.

Here, in order to bring the solvent into a supercritical state, a pressure vessel for raising the pressure of the solvent to a pressure higher than the critical point is required. When producing a monolithic silica porous material,
Its size is limited to the size of the high pressure vessel and it is difficult to make large insulation. In addition, the amount that can be produced at one time is limited, and there is a problem in productivity.

Therefore, by making the wet gel into a granular form, filling it in a high-pressure container, and performing supercritical drying, it is possible to improve not only the drying property but also the productivity.

However, the granular porous body needs to be molded when used as a heat insulating material. Therefore, in JP-A-10-152360, molding is performed using a binder made of an inorganic hydraulic material. In addition, Table 5
In 09940, molding is performed as a composite material with an inorganic binder.

[0011]

However, in the prior art, at least 5% or more of the binder component needs to be added to mix the binder component and the porous particles to form a heat insulating material. At this time, since the high solid thermal conductivity of the binder component adversely affects the heat insulating performance, there is a problem that the excellent heat insulating properties of the porous body are reduced. In order to reduce the influence of the binder component on the heat insulation performance at or below the measurement level, at least the amount of the binder component added must be less than 5%.

In view of the above problems, an object of the present invention is to provide a heat-insulating material having excellent heat-insulating properties by using porous particles having excellent heat-insulating properties, suppressing the adverse effects of the binder component on the heat-insulating properties, It is another object of the present invention to provide a method of manufacturing the same.

It is another object of the present invention to provide a heat-insulating box having excellent heat-insulating properties by suppressing the adverse effects of the binder component on the heat-insulating properties.

[0014]

According to the present invention, there is provided a heat insulating material comprising:
mm or less, and a resin coating covering the porous particles, wherein the porous particles are adhered at the contact points between adjacent porous particles by the resin coating on the surface thereof. It is characterized by having.

Further, the porous particles have a porosity of 60% or more and an average pore diameter of 100 nm or less.

Further, the porous particles are a polyurethane-based dry gel.

Further, the present invention is characterized in that the thickness of the resin coating is not more than 1/100 of the diameter of the porous particles.

Further, the softening temperature or the curing temperature of the coating resin is 150 ° C. or less.

According to the present invention, a heat-insulating material having excellent heat-insulating properties, in which the adverse effects of the binder component are suppressed, can be obtained by using porous particles having excellent heat-insulating properties.

In the method for producing a heat insulating material of the present invention, a step of coating a porous resin particle with a thermoplastic resin, a step of filling the resin-coated porous particle into an arbitrary mold, and heating the mold are provided. Thereby melting the coating resin, and curing the coating resin by cooling to adhere the porous particles to each other.

Further, the resin temperature in the heating / melting step is equal to or higher than the softening temperature of the resin and lower than a temperature obtained by adding 30 ° C. to the softening temperature.

A step of coating the porous particles with a thermosetting resin; a step of filling the resin-coated porous particles into an arbitrary mold; and a step of heating the mold to cure the coating resin. Bonding the porous particles to each other.

Further, the resin temperature in the heating / curing step is equal to or higher than the curing temperature of the resin and is lower than a temperature obtained by adding 30 ° C. to the curing temperature.

Further, the porous particles have a porosity of 60% or more, and the average pore diameter is 100 nm or less.

Further, the porous particles are a polyurethane-based dry gel.

The thickness of the resin film is not more than 1/100 of the diameter of the porous particles.

Further, the softening temperature or the curing temperature of the coating resin is 150 ° C. or less.

Further, the present invention is characterized in that the porous particles are formed together with the face material in the mold.

According to the present invention, it is possible to provide a method for producing a heat insulating material having excellent heat insulating properties, in which adverse effects due to a binder component are suppressed, using porous particles having excellent heat insulating performance.

The heat-insulating box of the present invention has a space formed by a first wall member, a second wall member, the first wall member, and the second wall member having a thickness of 10 mm or less. Characterized by the fact that the porous particles that fluctuate in diameter are adhered only to the adjacent porous particles by the resin covering the surface of the porous particles at their contact points, and are filled with a heat insulating material forming a molded body. It is.

The porous particles have a porosity of 60% or more and an average pore diameter of 100 nm or less.

Further, the porous particles are a polyurethane-based dry gel.

The resin film is characterized in that the thickness of the resin film is 1/100 or less of the diameter of the porous particles.

Further, the coating resin is characterized in that a softening temperature or an expensive temperature is 150 ° C. or less.

According to the present invention, there is provided a high-performance heat-insulating box provided with a heat-insulating material having excellent heat-insulating properties, in which adverse effects caused by a binder component are suppressed, using porous particles having excellent heat-insulating properties. Obtainable.

[0036]

BEST MODE FOR CARRYING OUT THE INVENTION The heat insulating material according to the first aspect of the present invention comprises porous particles having a diameter of 10 mm or less, and a resin coating covering the porous particles. Is characterized in that it is bonded at the contact point with the adjacent porous particles by a resin film on the surface thereof. Since the particle bonding component is provided as a resin film, the amount of addition is less than 5%. Thus, a heat insulating material having excellent heat insulating properties in which the adverse effect of the binder component on the heat insulating performance is suppressed can be obtained.

Further, the diameter of the porous particles is set to 10 mm or less, which indicates that the diameter of the porous particles ranges from the minimum diameter in a range in which the porous particles can be manufactured to 10 mm, and preferably 100 μm or more and 10 mm or less. .

According to the above configuration, the porous particles are formed into a molded product that is bonded to the adjacent porous particles only at the contact points through the resin coating the porous particles.

Further, since the thin resin coating the porous body adheres only to the contact points of the granules and acts as a shape retaining portion, there is no increase in resin heat conduction due to the addition of the binder substance, and the heat insulating properties of the porous body And a heat insulating material having excellent heat insulating performance, in which the adverse effects of the present invention are suppressed.

The heat insulating material according to claim 3 of the present invention is characterized in that the porous particles have a porosity of 60% or more and an average pore diameter of 100 nm or less. Since the body adhesive component is provided as a resin film, molding can be performed with an addition amount of less than 5%. As a result, a heat insulating material having excellent heat insulating properties, in which the adverse effect of the binder component on heat insulating performance is suppressed, is obtained. can get.

Here, the porosity of 60% is 60% or more and 1% or more.
Less than 00%, preferably 80% or more.

Further, the average pore diameter of 100 nm refers to 1 nm or more and 100 nm or less, and preferably 60 nm or less.

Due to the above hardness, the porosity is 60% or more, so the resin thermal conductivity is low, and the average pore diameter is 100 n.
m or less, a heat insulating material having low gas thermal conductivity and excellent heat insulating properties can be obtained.

The heat insulating material according to the fourth aspect of the present invention is characterized in that the porous particles are a polyurethane-based dry gel, and the particle adhesive component is provided as a resin film. Molding is possible with an addition amount of less than 5%,
As a result, a heat insulating material having excellent heat insulating properties, in which the adverse effect of the binder component on the heat insulating performance is suppressed, is obtained.

With the above configuration, the thermal conductivity is further reduced, and the density of the heat insulating material can be reduced.

A heat insulating material according to a fifth aspect of the present invention is characterized in that the thickness of the resin film is not more than 1/100 of the diameter of the porous particles, and the particle bonding component is a resin. Since it is provided as a film, molding can be performed with an addition amount of less than 5%, and as a result, a heat insulating material having excellent heat insulating properties, in which the adverse effect of the binder component on the heat insulating performance is suppressed, is obtained.

According to the above configuration, the porous granules are formed into a molded product which is bonded to the adjacent porous granules only at the contact points through the resin coating the porous bodies.

When the thickness of the resin film is 1/100 or less of the diameter of the porous particles, the volume ratio of the resin film acting as the shape retaining portion to the porous material is 3% or less. The detrimental effect on the heat insulation performance of the components is below the measurement level.

A heat insulating material according to a sixth aspect of the present invention is characterized in that the softening temperature or the curing temperature of the coating resin is 150 ° C. or less, and the granular adhesive component is provided as a resin film. Therefore, molding can be performed with an addition amount of less than 5%, and as a result, a heat insulating material having excellent heat insulating properties in which the adverse effect of the binder component on the heat insulating performance is suppressed can be obtained.

According to the above configuration, the porous particles are formed into a molded product that is bonded to the adjacent porous particles only at the contact points thereof through the resin coating the porous bodies.

Further, since the softening temperature or the curing temperature of the coating resin is 150 ° C. or less, the heating conditions in the molding step are mild, and the heat insulating properties of the organic porous material are not adversely affected.

Also, when applied to a heat insulating material integrated with other parts, there is no adverse effect on other members.

According to a seventh aspect of the present invention, there is provided a method of manufacturing a heat insulating material, comprising the steps of: coating a porous resin particle with a thermoplastic resin; and filling the resin-coated porous particle into an arbitrary mold. A step of melting the coating resin by heating the mold, and a step of curing the coating resin by cooling to bond the porous particles to each other, wherein the particle bonding component is a resin coating. Since it is provided, molding becomes possible with an addition amount of less than 5%, and as a result, a heat insulating material having excellent heat insulating properties, in which the adverse effect of the binder component on the heat insulating performance is suppressed, is obtained.

According to the above configuration, since the porous particles are coated with the resin, the porous particles have good slipperiness and can be easily and densely filled in an arbitrary mold.

[0055] The method for manufacturing a heat insulating material according to claim 8 of the present invention is characterized in that the resin temperature in the heating and melting step is equal to or higher than the softening temperature of the resin and lower than the temperature obtained by adding 30 ° C to the softening temperature. Since the granular adhesive component is provided as a resin film, it can be molded with an addition amount of less than 5%, and as a result, the adverse effect of the binder component on the heat insulating performance is suppressed. A heat insulating material having improved heat insulating properties is obtained.

With the above configuration, the coating resin melts gently without being melted down from the porous material due to rapid melting, and adheres to the resin coating coated on the adjacent porous material particles to form a molded product. Form.

Further, the heat insulating property of the organic porous material is not adversely affected.

According to a ninth aspect of the present invention, in the method for manufacturing a heat insulating material, a step of applying a thermosetting resin to the porous particles and a step of filling the resin-coated porous particles into an arbitrary mold are provided. And, the step of heating the mold to cure the coating resin, and bonding the porous particles to each other, characterized in that the particle adhesive component is applied as a resin coating, Molding becomes possible with an addition amount of less than 5%, and as a result, a heat insulating material having excellent heat insulating properties, in which the adverse effect of the binder component on the heat insulating performance is suppressed, is obtained.

According to the above configuration, since the porous particles are coated with the resin, they have good slipperiness and can be easily and densely filled in an arbitrary mold.

Further, since the coating resin is a thermosetting resin, the heat-resistant temperature of the heat insulating material is improved.

[0061] The method for manufacturing a heat insulating material according to claim 10 of the present invention is characterized in that the resin temperature in the heating / curing step is equal to or higher than the curing temperature of the resin and lower than the temperature obtained by adding 30 ° C to the curing temperature. Since the granular adhesive component is provided as a resin film, molding can be performed with an addition amount of less than 5%, and as a result, excellent heat insulation in which the adverse effect of the binder component on the heat insulating performance is suppressed is achieved. A heat insulating material having properties is obtained.

According to the above configuration, the coated resin adheres to the resin film coated on the adjacent porous particles without deteriorating the resin due to rapid heating to form a molded product.

Further, the heat insulating property of the organic porous material is not adversely affected.

A method for producing a heat insulating material according to claim 11 of the present invention is characterized in that the porous particles have a porosity of 60% or more and an average pore diameter of 100 nm or less. Yes, since the granular adhesive component is provided as a resin film, it can be molded with an addition amount of less than 5%, and as a result, has excellent heat insulating properties in which the adverse effect of the binder component on heat insulating performance is suppressed. Insulation is obtained.

Here, the porosity of 60% is 60% or more and 1% or more.
Less than 00%, preferably 80% or more.

Further, the average pore diameter of 100 nm refers to 1 nm or more and 100 nm or less, preferably 60 nm or less.

According to the above structure, the porosity is 60% or more, so that the thermal conductivity of the resin is low, and the average pore diameter is 100 n.
m or less, a heat insulating material having low gas thermal conductivity and excellent heat insulating properties can be obtained.

A method for producing a heat insulating material according to a twelfth aspect of the present invention is characterized in that the porous particles are a polyurethane-based dry gel, and the particle adhesive component is applied as a resin film. Therefore, molding can be performed with an addition amount of less than 5%, and as a result, a heat insulating material having excellent heat insulating properties in which the adverse effect of the binder component on the heat insulating performance is suppressed can be obtained.

With the above configuration, the thermal conductivity is further reduced, and the density of the heat insulating material can be reduced.

In the method for manufacturing a heat insulating material according to a thirteenth aspect of the present invention, the thickness of the resin film is 1/100 of the diameter of the porous particles.
Since the granular adhesive component is provided as a resin film, molding can be performed with an addition amount of less than 5%, and as a result, the adverse effect of the binder component on the heat insulating performance is reduced. A heat insulating material having suppressed and excellent heat insulating properties is obtained.

With the above configuration, the porous particles are formed into a molded product which is bonded to the adjacent porous particles only at the contact points through the resin coating the porous bodies.

When the thickness of the resin film is 1/100 or less of the particle diameter of the porous material, the volume ratio of the resin film acting as the shape retaining portion to the porous material is 3% or less. The detrimental effect on the heat insulation performance of the components is below the measurement level.

In the method for producing a heat insulating material according to the present invention, the softening temperature or the curing temperature of the coating resin is 150 ° C.
Since the granular adhesive component is provided as a resin film, molding can be performed with an addition amount of less than 5%, and as a result, the adverse effect of the binder component on the heat insulating performance is reduced. A heat insulating material having suppressed and excellent heat insulating properties is obtained.

With the above configuration, the porous particles are formed into a molded product that is bonded to the adjacent porous particles only at the contact points through the resin coating the porous bodies.

Further, since the softening temperature or the curing temperature of the coating resin is 150 ° C. or less, the heating conditions in the molding stage are mild, and the heat insulating properties of the organic porous material are not adversely affected.

Also, when applied to a heat insulating material integrated with other parts, no adverse effect is exerted on other members.

A method for manufacturing a heat insulating material according to a fifteenth aspect of the present invention is characterized in that porous particles are formed together with a face material in a mold, and the particle adhesive component is formed as a resin film. Since it is provided, molding becomes possible with an addition amount of less than 5%, and as a result, a heat insulating material having excellent heat insulating properties, in which the adverse effect of the binder component on the heat insulating performance is suppressed, is obtained.

According to the above configuration, adhesion between the mold and the heat insulating material can be prevented, and the heat insulating material can be easily removed from the mold.

The heat insulating box according to claim 16 of the present invention comprises:
A first wall member, a second wall member, and the first wall member,
And, in the space formed by the second wall member,
A porous particle having a diameter of 10 mm or less, and a resin film covering the porous particle, wherein the porous particle adheres at a contact point between adjacent porous particles by a resin film on the surface thereof. Since the heat insulating material is filled, and the granular adhesive component is provided as a resin film, molding can be performed with an addition amount of less than 5%, and as a result, As a result, a heat insulating box having excellent heat insulating properties in which adverse effects on the heat insulating performance due to the binder component are suppressed can be obtained.

The heat insulating box according to the seventeenth aspect of the present invention comprises:
The porous particles have a porosity of 60% or more and an average pore diameter of 100 nm or less. Since the particle adhesive component is provided as a resin film, the porous particles have a porosity of 5% or less.
% Can be formed, and as a result, a heat-insulating box having excellent heat-insulating properties, in which the adverse effect of the binder component on heat-insulating performance is suppressed, can be obtained.

The heat-insulating box according to claim 18 of the present invention comprises:
The porous granules are characterized by being a polyurethane-based dry gel, and since the granule adhesive component is provided as a resin film, molding can be performed with an addition amount of less than 5%. As a result, a heat insulating box having excellent heat insulating properties in which adverse effects on the heat insulating performance due to the binder component are suppressed can be obtained.

The heat insulation box according to claim 19 of the present invention is
The film thickness of the resin film is not more than 1/100 of the diameter of the porous particles. Since the particle adhesive component is provided as a resin film, the resin film is formed with an addition amount of less than 5%. As a result, a heat-insulating box having excellent heat-insulating properties in which the adverse effect of the binder component on heat-insulating performance is suppressed can be obtained.

The heat insulation box according to claim 20 of the present invention is
It is characterized in that the softening temperature or the curing temperature of the coating resin is 150 ° C. or less. Since the granular adhesive component is provided as a resin film, it can be molded with an addition amount of less than 5%. As a result, a heat-insulating box having excellent heat-insulating properties, in which the adverse effect of the binder component on the heat-insulating performance is suppressed, is obtained.

Hereinafter, the embodiment will be described with reference to FIGS.
This will be described with reference to FIG.

(Embodiment 1) FIG. 1 is a partially cutaway perspective view of a heat insulating box according to one embodiment of the present invention. In the drawing, reference numeral 1 denotes a heat insulating box, and a vacuum of an ABS resin composition is shown. A heat insulating material 4 made of a porous material composition is filled and buried in a space formed by the first wall member 2 which is a formed body and the second wall member 3 formed by processing a steel plate.

The porous molded heat insulating material 4 will be described with reference to FIG. 2. The porous molded heat insulating material 4 is composed of a porous granular material 5 and a coating resin coating 6, and the adjacent porous granular material is adhered by the coating resin film. .

(Embodiment 2) A method of manufacturing a heat insulating material will be described with reference to FIG.

FIG. 3 shows a method for producing a heat insulating material according to the present invention, in which a porous resin particle is coated with a thermoplastic resin.
Filling the resin-coated porous particles into an arbitrary mold, melting the coating resin by heating the mold, curing the coating resin by cooling, and bonding the porous particles to each other; And steps.

(Embodiment 3) A method of manufacturing a heat insulating material will be described with reference to FIG.

FIG. 4 shows a method of manufacturing a heat insulating material of the present invention, in which a step of applying a thermosetting resin coating to porous particles is provided.
The method includes a step of filling the resin-coated porous particles into an arbitrary mold, and a step of heating the mold to cure the coating resin and adhere the porous particles to each other.

The porous particles of the present invention have low density and good heat insulating properties, such as inorganic oxide aerogels such as silica aerogel and alumina aerogel, and organic aerogels such as polyurethane aerogel, polyisocyanate aerogel and phenol aerogel. The porous particles shown can be applied. In the present invention, polyurethane airgel can be preferably used because it has a low thermal conductivity. Further, a mixture of two or more airgels may be used. If the particle size is 10 mm or less, a mixture of two or more particle sizes may be used.

The resin film of the present invention is formed on the surface of the porous granular material by a rolling fluidized bed coating device, a centrifugal flow type coating device, or the like. In order for the porous particles to adhere to each other by heating and melting and cooling and curing the resin film, the coating resin only needs to be present at least at the contact point between the porous particles and the adjacent porous particles. Is required to be partially coated, so that the resin coverage does not need to be 100%, and the resin coating may be defective.

The coated thermoplastic resin material of the present invention includes:
It is a material that can cover the porous particles, and olefin-based resins such as polyethylene resin and polystyrene resin, and thermoplastic resins such as polyamide and polyester can be applied. Low molecular weight coating materials such as paraffin wax and microcrystalline wax are also applicable.

The coated thermosetting resin material of the present invention includes:
A material capable of covering the porous particles, and a thermosetting resin such as a polyurethane resin or a polyphenol resin can be applied.

The combination of the materials of the present invention has good adhesiveness and good recyclability.
Organic aerogels, particularly polyurethane-based aerogels and polyurethane-based coating agents are preferred.

[0096]

The present invention will be specifically described below with reference to examples. The present invention is not limited only to these.

(Example 1) Silica aerogel having an average particle size of 300 µm, a porosity of 90%, and an average pore size of 40 nm was used as the porous granular material, and polyethylene was used as a main component in a centrifugal flow type coating device manufactured by Freund Corporation. Softening temperature 10
A coating film having an average thickness of 2 μm was formed using a coating agent at 6 ° C.

The above resin-coated silica airgel was filled into a mold, kept at a resin temperature of 110 ° C. for a certain period of time, then returned to room temperature, and a heat insulating material was molded.

(Example 2) Polyurethane airgel having an average particle size of 300 µm, a porosity of 90%, and an average pore size of 40 nm was used as the porous granular material, and polyethylene was used as a main component in a centrifugal flow type coating device manufactured by Freund Corporation. A film having an average film thickness of 2 μm was formed using a resin having a softening temperature of 106 ° C.

The resin-coated polyurethane aerogel was filled in a mold, kept at a resin temperature of 110 ° C. for a certain period of time, then returned to room temperature, and a heat insulating material was molded.

(Example 3) Polyurethane airgel having an average particle size of 300 µm, a porosity of 90%, and an average pore size of 40 nm was used as the porous granular material, and polyurethane was used as a main component in a centrifugal flow type coating device manufactured by Freund Corporation. A coating film having an average film thickness of 2 μm was formed using a resin having a curing temperature of 100 ° C.

The above resin-coated polyurethane aerogel was filled in a mold, kept at a resin temperature of 110 ° C. for a certain period of time, then returned to room temperature, and a heat insulating material was molded.

(Example 4) Polyurethane aerogel having an average particle diameter of 300 µm, a porosity of 90%, and an average pore diameter of 40 nm was used as the porous granular material, and synthetic wax was used as a main component in a centrifugal flow type coating device manufactured by Freund Corporation. A film having an average film thickness of 2 μm was formed using a resin having a softening temperature of 74 ° C.

The above resin-coated polyurethane aerogel was filled in a mold, kept at a resin temperature of 80 ° C. for a certain period of time, then returned to room temperature, and a heat insulating material was molded.

Comparative Example 1 The porous particles had an average particle size of 30.
A silica airgel having a pore size of 0 μm, a porosity of 90%, and an average pore diameter of 40 nm is used. A paste obtained by kneading Portland cement and water in a ratio of 100: 35 as a binder component is used. The silica airgel and the paste are mixed in a ratio of 1: 1. Then, the plate was poured into a mold to produce a flat plate.

(Comparative Example 2) Silica aerogel having an average particle diameter of 300 µm, a porosity of 90%, and an average pore diameter of 40 nm was used as the porous granular material, and was mainly composed of synthetic wax by a centrifugal flow type coating device manufactured by Freund Corporation. Softening temperature 74 ° C
A resin film having an average film thickness of 2 μm was used.

The resin-coated silica airgel was filled in a mold, kept at a resin temperature of 80 ° C. for a certain period of time, then returned to room temperature, and a heat insulating material was molded.

Comparative Example 3 Porous silica having an average particle diameter of 300 μm, a porosity of 90%, and an average pore diameter of 200 nm was used as the porous granular material. A film having an average film thickness of 2 μm was formed using a resin having a softening temperature of 74 ° C.

The above resin-coated silica airgel was filled in a mold, kept at a resin temperature of 80 ° C. for a certain period of time, then returned to room temperature, and a heat insulating material was molded.

(Comparative Example 4) Silica aerogel having an average particle diameter of 300 µm, a porosity of 90%, and an average pore diameter of 200 nm was used as the porous granular material, and was mainly composed of synthetic wax by a centrifugal flow type coating device manufactured by Freund Corporation. Softening temperature 74
A coating having an average film thickness of 50 μm was formed using a resin having a temperature of ° C.

The above resin-coated silica airgel was filled in a mold, kept at a resin temperature of 80 ° C. for a certain period of time, then returned to room temperature, and a heat insulating material was molded.

(Comparative Example 5) Polyurethane aerogel having an average particle size of 300 µm was used as the porous granular material, and a resin having a softening temperature of 183 ° C containing tributylcellulose as a main component was measured using a centrifugal flow type coating device manufactured by Freund Corporation. A coating having an average film thickness of 2 μm was used.

The above resin-coated silica airgel was filled in a mold, kept at 184 ° C. for a certain period of time, then returned to room temperature, and a heat insulating material was molded.

(Comparative Example 6) Silica aerogel having an average particle diameter of 300 µm was used for the porous granular material, and a resin having a softening temperature of 74 ° C as a main component of synthetic wax was used in a centrifugal flow type coating device manufactured by Freund Corporation. A coating having a thickness of 2 μm was used.

The above resin-coated polyurethane aerogel was filled in a mold, kept at 100 ° C. for a certain period of time, returned to room temperature, and then molded into a heat insulating material.

The heat insulating materials of Examples 1 to 3 and Comparative Examples 1 to 6 were measured for density and thermal conductivity.

The thermal conductivity was measured by A, manufactured by Eiko Seiki Co., Ltd.
It was measured by UTO-Λ.

[0118]

[Table 1]

The heat insulating material of Example 1 of the present invention uses silica airgel for the porous particles and a coating agent mainly composed of polyethylene for the coating resin, so that the particle adhesive component is applied as a resin film. To be
Molding is possible with an addition amount of less than 5%, and as a result, a heat insulating material having excellent heat insulating properties in which the adverse effect of the binder component on the heat insulating performance is suppressed is obtained.

Further, in Example 1, the silica airgel had an average particle size of 300 μm, a porosity of 90%, and an average pore size of 40%.
Because of μm, the resin heat conduction and the gas heat conduction are low, indicating excellent heat insulation performance.

Further, since the softening temperature of the coating agent mainly composed of polyethylene is 106 ° C., and the resin temperature in the heating / melting step is 110 ° C., the silica airgel particles cover the polyethylene resin coating the surface thereof. Adheres to adjacent silica airgel particles, and can be regarded as a molded article.

Further, since the coating thickness of the resin film is 2 μm, the adverse effect on the heat insulation performance due to the binder component is suppressed.

In the heat insulating material of Example 2 of the present invention, a polyurethane airgel is used for the porous particles, and a coating agent mainly composed of polyethylene is used for the coating resin. Therefore, molding can be performed with an addition amount of less than 5%, and as a result, a heat insulating material having excellent heat insulating properties in which the adverse effect of the binder component on the heat insulating performance is suppressed can be obtained.

Further, in Example 2, since the polyurethane airgel had an average particle diameter of 300 μm, a porosity of 90%, and an average pore diameter of 40 μm, the resin heat conduction and gas heat conduction were low and exhibited excellent heat insulating performance. ing.

Further, since the softening temperature of the coating agent containing polyethylene as the main component is 106 ° C. and the resin temperature in the heating / melting step is 110 ° C., the polyurethane airgel particles are coated with polyethylene coating the surface thereof. The resin can be bonded to the adjacent polyurethane airgel particles by the resin to form a molded body.

Further, since the coating thickness of the resin film is 2 μm, the adverse effect of the binder component on the heat insulating performance is suppressed.

Further, since the porous particles are made of polyurethane, the heat insulating performance is better and the density is lower.

The brittle resistance was also improved as compared with the inorganic airgel.

The heat insulating material of the third embodiment of the present invention uses a polyurethane airgel for the porous particles and a coating agent containing polyurethane as a main component for the coating resin, so that the particle adhesive component is applied as a resin film. Therefore, molding can be performed with an addition amount of less than 5%, and as a result, a heat insulating material having excellent heat insulating properties in which the adverse effect of the binder component on the heat insulating performance is suppressed can be obtained.

Furthermore, in Example 3, since the polyurethane airgel had an average particle diameter of 300 μm, a porosity of 90%, and an average pore diameter of 40 μm, the resin heat conduction and the gas heat conduction were low and exhibited excellent heat insulating performance. ing.

Further, since the curing temperature of the coating agent containing polyurethane as a main component is 100 ° C. and the resin temperature in the heating / curing step is 110 ° C., the urethane airgel particles are coated on the polyethylene resin Thereby, it adheres to the urethane airgel particles adjacent to each other to form a molded body.

Further, since the coating thickness of the resin film is 2 μm, the adverse effect of the binder component on the heat insulating performance is suppressed.

Further, since the porous particles are made of polyurethane, the heat insulating performance is better and the density is lower.

The brittle resistance was also improved as compared with the inorganic airgel.

Further, since the coating resin is mainly composed of polyurethane, the heat resistance as a heat insulating material is also improved.

The heat insulating material of Example 4 of the present invention uses polyurethane aerogel for the porous particles and synthetic wax for the coating resin, so that the particle adhesive component is provided as a resin film. % Can be formed, and as a result, a heat insulating material having excellent heat insulating properties in which the adverse effect of the binder component on the heat insulating performance is suppressed can be obtained.

Further, since the softening temperature of the synthetic wax is 74%, and the resin temperature in the heating / melting step is 80 ° C., the polyurethane airgel granules are adjacent to the polyurethane airgel by the synthetic wax coating the surface thereof. It can adhere to the granules to form a compact.

Further, since the coating thickness of the resin film is 2 μm, the adverse effect of the binder component on the heat insulating performance is suppressed.

Further, since the porous particles are made of polyurethane, the heat insulating performance is better and the density is lower.

The brittle resistance was also improved as compared with the inorganic airgel.

In Comparative Example 1, the excellent heat resistance of the silica airgel was not exhibited. This is because 10 parts of Portland cement and water are used as binder components.
The paste kneaded at a ratio of 0:35 is used, and the silica airgel and the paste are mixed and molded at a ratio of 1: 1. Therefore, a large amount of a binder component is added, and the adverse effect of the excellent heat insulating performance of the silica airgel is obtained. Has become.

In Comparative Example 2, the thermal conductivity is large. This is because, since the porosity is less than 60%, the thermal conductivity of the resin is increased, and the heat insulating performance is deteriorated.

In Comparative Example 3, the thermal conductivity is large. This is because the average pore diameter of the porous silica body was 200 μm, so that the gas thermal conductivity increased and the electrothermal performance deteriorated.

In Comparative Example 4, the thermal conductivity is large. This is because the coating resin has a film pressure of 40 μm and is 1/100 or more of the average particle size of the silica airgel, and thus the coating resin is a harmful effect of the excellent heat insulating performance of the silica airgel.

In Comparative Example 5, the thermal conductivity is large. This is because the coating resin has a high softening temperature and the resin temperature in the heating / melting step is high, so that the polyurethane airgel is deteriorated and the porous structure is destroyed.

In Comparative Example 6, the thermal conductivity is large. This is because the resin temperature in the heating / melting step is 100 ° C., so that the resin is melted, partially melted off from the silica airgel, and locally forms a massive resin.

In addition, the moldability of the heat insulating material was impaired.

(Embodiment 5) The space formed by the first wall member, the second wall member, the first wall member, and the second wall member is the same as that of the third embodiment. Was filled with the heat insulating material, and the heat insulating box was provided to complete the refrigerator. As a result, the endothermic load was improved by 20% as compared with the conventional urethane foam.

As a result, it is possible to provide a heat insulating material having excellent heat insulating properties, a method of manufacturing the heat insulating material, and a heat insulating box in which the adverse effect of the binder component on the heat insulating performance is suppressed.

[0150]

As described above, according to the present invention, the porous body having excellent heat insulating performance is used, and the granular adhesive component is provided as a resin film. As a result, it is possible to provide a heat insulating material having excellent heat insulating properties, a method of manufacturing the heat insulating material, and a heat insulating box, in which the adverse effect of the binder component on the heat insulating performance is suppressed.

[Brief description of the drawings]

FIG. 1 is a partially cutaway inset view of a heat insulating box according to one embodiment of the present invention.

FIG. 2 is a schematic view of a foam insulation according to Embodiment 1 of the present invention.

FIG. 3 is a diagram showing a method for manufacturing a heat insulating material of the present invention.

FIG. 4 is a view showing a method for manufacturing a heat insulating material of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulated box 2 First wall member 3 Second wall member 4 Heat insulating material 5 Porous material 6 Coating resin

Continued on the front page (72) Inventor Masaaki Suzuki 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 3H036 AA08 AA09 AB18 AB23 AC01 AE13

Claims (20)

[Claims] The present invention comprises a porous particle and a resin coating for covering the porous particle, and the porous particle is adhered by a resin coating on the surface of the porous particle at a contact point with an adjacent porous particle. Insulation. 2. A porous particle having a diameter of 10 mm or less, and a resin film covering the porous particle, wherein the porous particle is adjacent to the porous particle by a resin film on its surface. A heat insulating material characterized by being adhered at a contact point. 3. The heat insulating material according to claim 2, wherein the porous particles have a porosity of 60% or more and an average pore diameter of 100 nm or less. 4. The heat insulating material according to claim 2, wherein the porous particles are a polyurethane-based dry gel. 5. The method according to claim 1, wherein the thickness of the resin coating is 1 / the diameter of the porous particles.
The heat insulating material according to any one of claims 2 to 3, wherein the heat insulating material is 100 or less. 6. The coating resin having a softening temperature or a curing temperature of 1
The heat insulating material according to any one of claims 2 to 5, wherein the temperature is 50 ° C. 7. A step of applying a thermoplastic resin coating to the porous particles, a step of filling the resin-coated porous particles into an arbitrary mold, and a step of melting the coating resin by heating the mold. And a step of curing the coating resin by cooling and bonding the porous particles to each other. 8. The method according to claim 7, wherein the resin temperature in the heating / melting step is equal to or higher than the softening temperature of the resin and lower than a temperature obtained by adding 30 ° C. to the softening temperature. 9. A step of applying a thermosetting resin coating to the porous particles, a step of filling the resin-coated porous particles into an arbitrary mold, and curing the coating resin by heating the mold. And adhering the porous particles to each other. 10. The method for manufacturing a heat insulating material according to claim 9, wherein the resin temperature in the heating / curing step is equal to or higher than the curing temperature of the resin and lower than a temperature obtained by adding 30 ° C. to the curing temperature. 11. The heat insulating material according to claim 7, wherein the porous particles have a porosity of 60% or more and an average pore diameter of 100 nm or less. Manufacturing method. 12. The method for producing a heat insulating material according to claim 7, wherein the porous particles are a polyurethane-based dry gel. 13. The method of claim 1, wherein the thickness of the coating resin is 1% of the diameter of the porous particles.
The method for producing a heat insulating material according to any one of claims 7 to 12, wherein the ratio is not more than / 100. 14. The method according to claim 7, wherein the softening temperature or the curing temperature of the coating resin is 150 ° C. or less. 15. The porous material is formed together with the face material in the mold.
The method for producing a heat insulating material according to any one of the above. 16. A porous body having a diameter of 10 mm or less in a space formed by a first wall member, a second wall member, the first wall member, and the second wall member. And a resin coating covering the porous particles, wherein the porous particles are adhered at a contact point between adjacent porous particles by a resin coating on the surface thereof. A heat-insulating box characterized by being filled with a material. 17. The heat insulating box according to claim 16, wherein the porous particles have a porosity of 60% or more and an average pore diameter of 100 nm or less. 18. The porous material according to claim 16, wherein the porous material is a polyurethane-based dry gel.
7. The heat-insulating box according to 7. 19. The film thickness of the resin film is one of the porous particle diameters.
The heat-insulating box according to any one of claims 16 to 18, wherein the ratio is not more than / 100. 20. The heat insulating box according to claim 16, wherein the softening temperature or the curing temperature of the coating resin is 150 ° C. or less.