JP2001279877A - Thermal insulation roof material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roof material having the thermal insulation property additionally while maintaining a function of a conventional roof material. SOLUTION: (1) High molecular binder layer containing closed cells due to hollow particles or/and foam, (2) fibrous basic material and the accumulated layer described in (1), (3) a layer packed in vacuum or (4) aerogel containing at least either component of silica and carbon or a layer in which they are packed in vacuum are accumulated on a rear surface of the roof material 2 such as a tile and a metallic plate as a thermal insulation layer 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-insulating roof material which can be used for a roof of a building and can provide heat insulation without using another heat-insulating material in combination.

[0002]

2. Description of the Related Art Various types of roofing materials have been used for finishing roofs of buildings. For example, an antile
Or a roof tile such as a glaze tile, a cement roof tile, a slate, or a metal roofing material such as aluminum or a steel plate.

[0003] In addition to this, waterproofing with a roof sheet or paint on a building does not mean that it constitutes a roofing material, and a special material, an area-limited one, or an awning is considered as one of the roofing materials. Although it is possible, here, the roof material is a plate-like body that can be carried by humans, and at the time of construction, the necessary number is arranged while raining and used to finish the roof Specifically, those made of ceramics such as the above tiles, cement tiles, or slate, or aluminum or aluminum alloys, for example, steel plates such as duralumin, iron, and stainless steel, copper, brass, titanium, and the like Metals such as

[0004] A building originally plays a role of a shelter for protecting people and the like from the natural environment, and the roof, walls, floors, and the like constituting the building each have a common role of heat insulation and the like. The material used and the construction method used are different in order to fulfill the function corresponding to the part.

[0005] Of these, the roof is roofed using the above-mentioned roofing material, and functions to block rainfall and snowfall and to prevent water leakage. Since the tiles occupied had a certain degree of heat insulation, little attention was paid to the heat insulation of the roofing material itself.

However, the roof is more susceptible to the effects of cold and warmth due to sunshine, rainfall, snowfall, etc.
In recent years, roofs have been required to have heat insulation properties due to the spread of slate as a roofing material due to changes in construction methods, and the need to improve energy efficiency in order to avoid global warming. Above all, roof materials made of metal have lower heat insulating properties than other materials, and there is a high need to improve heat insulating properties.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a roofing material which has the function of a conventional roofing material and further has a heat insulating property.

[0008]

The above-mentioned object is achieved by using a polymer binder layer having closed cells made of hollow particles and / or air bubbles as an insulating layer and laminating the insulating layer on the back surface of the roofing material, or by further forming the insulating layer. The problem is solved by using a laminate with a fibrous base material. The above problem is solved by laminating a heat insulating layer made of silica or carbon airgel on the back surface of the roofing material. The above problem is solved by laminating a heat insulating layer formed by vacuum-packing the heat insulating material on the back surface of the roofing material.

The first invention is characterized in that a heat insulating layer made of a polymer binder containing hollow particles or / and air bubbles is laminated on the back surface of a roof material made of metal or ceramics. It is about materials. According to a second invention, in the first invention, a polymer binder containing hollow particles or / and air bubbles is laminated on at least one surface of the fibrous base material on the back surface of the roofing material made of metal or ceramics. The present invention relates to a heat-insulating roofing material characterized in that a heat insulating layer having a structure is laminated. The third invention relates to a heat-insulating roofing material characterized in that a heat-insulating layer made of aerogel containing at least either silica or carbon is laminated on the back surface of a roofing material made of metal or ceramics. is there. The fourth invention relates to a heat-insulating roofing material characterized in that a heat-insulating layer formed by vacuum-packing a heat-insulating material is laminated on the back surface of a roofing material made of metal or ceramics. A fifth invention relates to the heat-insulating roofing material according to the fourth invention, wherein the heat-insulating layer is made of aerogel containing at least either silica or carbon.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A roofing material 1 according to the present invention is shown in FIG.
As shown in FIG. 2, the heat insulating layer 3 is laminated on the back surface of the tile 2a, and each roofing material 1 is fixed to a roof by hooking on a tile bar 5 provided on a roof foundation 4 in advance. Actually, the roof foundation 4 has a predetermined gradient, and becomes lower toward the left. Further, the roofing material 1 of the present invention has a heat insulating layer 3 laminated on a back surface of a metal plate 2b as shown in FIG.
Each roofing material 1 is fixed to a roof foundation 4 with nails 6 or the like.

In the present invention, the roofing material on which the heat insulating layer 3 is to be laminated is made of a ceramic material such as a tile, a cement tile or a slate, or an aluminum or aluminum alloy such as duralumin, iron or stainless steel. And a metal such as steel plate, copper, brass, titanium or the like. The heat insulating layer 3 laminated on the back surface of the roofing material 1 of the present invention can be roughly classified into (1) one made of a polymer binder containing hollow particles or / and air bubbles, and (2) one of a fibrous base material. The surface (1) wherein the polymer binder containing hollow particles or / and air bubbles is laminated, (3) the material comprising silica or carbon aerogel, and (4) the heat insulating material of (3) is vacuum-packed There are four types that are configured.

The heat insulating layer 3 of the type (1) made of a polymer binder containing hollow particles or / and air bubbles has a high number of closed cells inside the polymer binder layer 8. With such a structure, convection of air can be suppressed, and heat conduction can be minimized. Specifically, the myriad of closed cells in the polymer binder layer 8 are formed of fine bubbles, bubbles generated by foaming a chemical blowing agent, or hollow particles, or both.

In general, the coating composition is applied to form a foamed state by generating fine bubbles of a gas, particularly an inert gas, preferably a gas having a low thermal conductivity, by mechanical stirring or by using an organic compound. Either one or both of the chemical foaming agents made of a compound are blended in the coating composition as a foaming agent, and in any case, after application, the foaming is performed by heating. In the present invention, a general chemical blowing agent can be used as the blowing agent, and specifically, an azo blowing agent such as azodicarbonamide or azobisisobutyronitrile, benzenesulfonyl hydrazide, or p-
Examples include sulfonyl hydrazide such as toluenesulfonyl hydrazide, nitroso such as dinitrosopentamethylenetetramine, sodium bicarbonate, and ammonium bicarbonate.

A microcapsule type foaming agent having an outer wall of a capsule made of acrylonitrile resin or the like and containing a low-boiling hydrocarbon such as isobutane or neopentane is suitable for relatively low-temperature foaming and is a preferred foaming agent. As such a microcapsule-type foaming agent, for example, a foaming agent manufactured by Matsumoto Yushi Seiyaku Co., Ltd. (F-46, F-5 in product number)
0, F-55, F-80, or F-85, F-80
s, F-100, F-110 and the like can be used.
The expansion ratio is 20 times or more, which is preferable. When a chemical foaming agent is used, a foaming aid for lowering the foaming temperature to facilitate foaming may be used, if necessary.

As the hollow particles, those having an outer wall made of an organic or inorganic material can be used, and those made of an organic material such as a phenol resin, an acrylic resin, an acrylonitrile resin, or a polystyrene resin, and those made of an inorganic material such as a shirasu balloon. Can be used. These hollow particles preferably have a specific gravity of 0.3 or less.

In the former hollow particles having an organic substance as an outer wall, before the microcapsule-type foaming agent described in the preceding paragraph is blended into the coating composition, the hollow particles correspond to foaming agents, that is, foamed foaming agents. For example, hollow particles (product number: F-80ED or F-80E) manufactured by Matsumoto Yushi Seiyaku Co., Ltd. have a small density of 0.02 g / cm ^3. Therefore, it is effective in suppressing thermal conductivity, and it is preferable to use it.

The polymer binder layer 8 is composed of a polymer binder and bubbles or / and hollow particles formed by foaming the foaming agent therein. , Fine foam, foaming agent, hollow particles, polymer binder, and solvent, and, if necessary, various additives to be dissolved or dispersed to prepare a coating composition, which will be described later by an appropriate means. It is performed by applying to such a fibrous base material or applying to a metal belt or the like and drying, and then heating and foaming. The polymer binder layer 8 thus obtained functions as a heat insulating layer. When manufacturing on a metal belt, it is separated from the belt at an appropriate timing to form a single polymer binder layer.

The polymer binder constituting the polymer binder layer includes nitrocellulose, cellulose acetate, cellulose butyrate acetate, ethyl cellulose, polyamide resin,
Chlorinated rubber, cyclized rubber, polyamide resin, polyvinyl chloride resin, vinyl chloride / vinyl acetate copolymer resin, polyvinyl acetate resin, ethylene / vinyl acetate copolymer resin, chlorinated polypropylene, acrylic resin, polyurethane resin, polystyrene resin, Styrene maleic resin, polyvinyl alcohol resin, polyvinyl acetal (polyvinyl formal, polyvinyl butyral, etc.) resin, cyanoacrylate resin, polyvinyl alkyl ether resin, polyvinyl chloride, epoxy resin, urea resin, melamine resin, phenol resin, resorcinol resin, furan resin , Epoxy resin, unsaturated polyester resin, polyimide resin,
Polyamide-imide resin, polybenzimidazole resin,
Among polybenzothiazole resins and the like, one or two or more are selected and used according to the application. Also,
Natural rubber, recycled rubber, sutylene-butadiene rubber, acrylonitrile-butadiene rubber, chloroprene rubber,
Butyl rubber, polysulfide rubber, silicone rubber, polyurethane rubber, stereo rubber (synthetic natural rubber), ethylene propylene rubber, block copolymer rubber (SBS, SIS, SEBS, etc.) can also be used.

As additives to be added as required, there are an antifoaming agent, a surfactant, a dispersant, an anti-settling agent, and a foaming aid. Note that the hollow particles and the microcapsule-type foaming agent may be coated with silicone oil or silicone resin to enhance waterproofness.

The coating composition for forming a polymer binder layer is
When prepared using only the microcapsule-type foaming agent as a component for obtaining air bubbles, when the microcapsule-type foaming agent exceeds 10% by mass in the coating composition, when the polymer binder layer is foamed, As a result of volume expansion, the polymer binder layer may float from the object to be coated and peel off. In order to avoid this, it is preferable to perform the application from the lower surface side of the object to be applied and to mix particles having a low specific gravity into the coating composition. Particularly good results are obtained when low specific gravity particles having a specific gravity of 0.3 g / cm ³ or less are used. In this case, a polymer binder, a microcapsule type foaming agent, and a low specific gravity,
In particular, the mixing ratio of particles having a specific gravity of 0.3 g / cm ³ or less is
The density of the obtained heat insulating layer is 0.02 to 0.05 g / cm ³
It should be adjusted so that

As means for applying the coating composition on a fibrous base material or on a metal belt, there are known coating layer means such as roll coating, gravure coating, spray coating, curtain flow coating, or pouring. Yes, or printing means such as silk screen printing, flexographic printing, gravure printing, etc. can also be used, and it is preferable that the thickness of the coating film is large, but in consideration of application stability and dryness, foam the foaming agent It is preferable to form a coating film having a thickness of about 20 μm to 500 μm in a previously dried state. Further, the density of the finally obtained heat insulating layer is preferably from 0.03 to 0.05 g / cm ³ .

The heat-insulating layer of the type (2) of the heat-insulating layer 3 is formed by laminating the polymer binder layer 8 containing the hollow particles or / and air bubbles on one surface of the fibrous base material 7.
Alternatively, a part or all of the polymer binder layer 8 is impregnated in the fibrous base material 7. However, FIG. 2 shows a state in which the entirety of the polymer binder layer 8 is impregnated in the fibrous base material 7.

As the fibrous base material 7, cloth, non-woven fabric, paper or the like can be used. From the viewpoint of impregnation with the polymer binder 8 containing hollow cells and / or closed cells due to inclusion of cells, It is preferable to use a nonwoven fabric. Although there is no particular limitation, the weight per unit area is preferably 100 g / m ² or less. Further, as described later, since the polymer binder layer 8 as the upper layer of the fibrous base material 7 is manufactured by applying a coating composition, the polymer binder layer 8 is impregnated into the fibrous base material 7 and adheres. From the viewpoint of improving the air permeability, the air permeability is 100 seconds / 1
It is preferably not more than 00 cm ³ . When a film such as plastic or a non-woven fabric having a thickness of more than 100 g / m ² is used as a base material, the adhesiveness, particularly, the adhesiveness after foaming of the polymer binder layer 8 is not sufficient. This is not impregnating,
Or it is considered to be scarce.

It is desirable that the fibrous base material 7 has one surface smoothed by heating and pressing. Reference numeral 9 indicates that the vicinity 9 of the smoothed surface has an increased density and the hatching density is increased. The heat and pressure processing is preferably performed by a flat plate press, a roll press, or embossing. In the case of flat press,
In the case of a roll press, only one roll is heated, and in the case of embossing, only the embossing plate is heated. The surface of the fibrous base material 7 and the vicinity thereof are smoothed by thermal deformation or fusion only on the side where the press platen, roll, or embossing plate hits. When a general nonwoven fabric of a chemical fiber is used as the fibrous base material 7, the surface temperature of the press plate, roll, or embossing plate on the high-temperature side is set to about 70 to 130 ° C. The board or roll is preferably set to about 50 to 100 ° C.

Depending on the material, density, or required degree of smoothness of the fibrous base material 7 to be used, the heating is performed by pressing the fibrous base material 7 against the heated roll only by its tension. Pressure processing may be performed, and therefore, it is not always necessary to use a pair of press plates or a pair of rolls. Also, a method of blowing hot air or a method of passing over a flame can be adopted.

In the application of the coating composition, the density of the fibrous base material 7 on the side smoothed by the heat and pressure processing is increased, and the coating composition penetrates inside. Therefore, it is preferable to perform the heat treatment from the surface on the opposite side to the surface smoothed by the heat and pressure processing. After the application, heat drying is carried out by an appropriate drying means. However, prior to the heat drying, it may be left to dry naturally, or it may be air-dried by applying only air, and then may be heated and dried. Foaming may be performed after the above drying or foaming while drying. Either method is employed depending on the type of foaming agent, foaming temperature, and the like.

The heat insulating layer of the type (3) of the heat insulating layer 3 is made of silica or carbon (FIG. 3). These are called porous bodies. Examples of the porous bodies include calcium silicate and activated carbon. The porous body is
Since the structure has small voids on the order of nanometers (nm), it has good heat insulating properties. Moreover, since it is a molded body, it is easy to manufacture and handle, and the risk of breakage is very small. What is called an aerogel is also included in this range. Aerogels include silica aerogels, carbon aerogels, and resin aerogels, which have almost ideally several tens of nanometer voids in a unit volume, and the particles that serve as the skeleton of the structure are also in point contact. High effect.

[0028] These porous bodies are composed of particles serving as a skeleton of the structure.
The size of the element is as small as 1 nm to 100 nm,
In addition to providing thermal properties, the particles are close to point contact
Contact makes it difficult for heat to be transmitted,
Since the gap is small, the effect of convection can be reduced. these
Use the porous body as it is, or mix it with fiber, etc.
A porous body may be produced and used as a filler.
The density of the filler made of the above various porous materials is
0.005 to 1 g / cm ^ThreeIt is preferred that What
Regarding the material particles or porous material,
It is common to say so-called "bulk density",
When using una material alone or in combination with other materials
Is also compressed during filling and molding,
May be considered to be within the above-mentioned density range.

In the above-mentioned heat-insulating layer, even when the inside of which is sealed with the filler is at atmospheric pressure, the heat-insulating property can be exerted by the action of the filler, but the air inside (normal air of normal atmosphere) can be exhibited. By replacing (meaning) with a low heat conductive gas such as freon gas, carbon dioxide gas, cyclopentane, etc., better heat insulating properties can be obtained than when air is contained inside.

As shown in FIG. 4, the heat-insulating layer (4) of the type of the heat-insulating layer 3 is composed of a heat-insulating material 3 made of silica or carbon aerogel, and vacuum-packed with gas barrier sheets 11 and 11 'on the upper and lower sides. It was done.
When the inside of the heat insulating layer is set in a reduced pressure state or a vacuum state, higher heat insulating properties can be exhibited. As for the degree of the reduced pressure state or the vacuum state, it is preferable that the lower the lower the lower the probability of collision between gas molecules. Assuming that the air can easily reach about 1 Torr (= 1 mmHg), the mean free path of air is about 50 μm.
If the size of the space where air molecules can freely move around is surely smaller than 50 μm due to the presence of the filler, heat conduction due to collision of air molecules hardly occurs.
The production of airgel is performed by performing supercritical drying at high temperature and high pressure using a sol-gel reaction.

It should be noted that, depending on various dimensions of the material to be used as a filler, if the air is evacuated to a pressure of 10 Torr or less, a practically satisfactory heat insulating property can be obtained. If the degree of vacuum is further increased, the heat insulating property is enhanced, and as a lower limit, 10 ^-6 T
Orr is preferable because higher heat insulating properties are obtained, but practically, a predetermined degree of vacuum can be reached in a short time, and a lower limit of 10 ⁻³ Torr can be prevented during storage. Is more preferable.

If only the peripheral portion of the heat insulating layer 3 is sealed, if the flexible sheet or the sealing portion is finely damaged, the sealing property is lost and the pressure returns to the atmospheric pressure. Might be. As a workaround, use the required number of individual insulation layers 3 of relatively small size side by side, or use one insulation layer as in clothing quilting, but between each small enclosed space. It is even better if the seal is sealed and breakage should not affect the adjacent small sealed space. When divided and sealed in this way, there is also a negative point that the heat insulating property of the sealed part decreases, so with a heat insulating material,
A partition having a thickness of the heat insulating layer 3 or a frame of a lattice shape or the like may be formed, a filler may be filled in a space surrounded by the partition, and the upper and lower gas barrier sheets may be sealed through the partition. Alternatively, the filler once placed in a gas-permeable inner bag may be sealed with a gas barrier sheet to evacuate the inside.

Further, a substance serving as a getter, for example, calcium hydroxide, activated carbon, activated carbon fiber, silica gel, zeolite, molecular sieve, or the like is coexisted with the filler in the sealed packaging bag, or the getter itself is used as the filler. Or, if the getter is mixed in the packing material so that the packing material acts as a getter, etc., when moisture is removed or when the vacuum is maintained, the air or internal air that flows in due to minute vacuum leakage (E.g., in the case of a foamed polyurethane resin, carbon dioxide gas generated by reacting with moisture) generated by the temporal change of the filler may be adsorbed to maintain the degree of vacuum.

It is known in the field of vacuum heat insulation that the filling of the filler to suppress the collision of air molecules and obtain heat insulation is effective in a relatively low degree of vacuum. However, in such a case, the inside of the double wall is filled with a filler, and a material having a thickness of, for example, several tens mm is used only in the low-temperature industry, and as in the present invention, a flexible sheet, preferably There has not been an example in which a gas barrier sheet is used as a heat insulating layer by sealing with a gas barrier sheet and attaching to a building member.

Although the roofing material of the present invention basically has the above-described configuration, the surface of the roofing material may be provided with makeup by a known method. Typically, they are painted or embossed, but they may be combined or printed, or transferred or laminated with a film. By applying an acrylic resin film or a fluororesin film printed thereon after coating, a product excellent in durability can be obtained.

[0036]

EXAMPLES Example 1 A polyester nonwoven fabric (BT1611W, manufactured by Unicell Corporation, weight per unit area: 70 g / m ² , thickness: 220 μm) was prepared, and the following coating composition was applied using a comma coater, and then applied at 120 ° C. For 1 minute, and then foamed at a temperature of 150 ° C. to obtain a heat insulating sheet having a heat insulating layer with a thickness of 10 mm. The thermal conductivity of this heat insulating sheet was 0.035 kcal / mh ° C.

(Coating composition) Hollow particles 10 parts (outer diameter: 6 μm, outer wall: acrylonitrile resin, Matsumoto Yushi Pharmaceutical Co., Ltd., F-40E, specific gravity of particles: 0.1, solid content 40%) ・ Microcapsule type foaming agent ・ ・ ・ ・ ・ ・ ・ ・ ・ 57 Part (outer wall: acrylonitrile resin, Matsumoto Yushi Pharmaceutical Co., Ltd., F-55, specific gravity of particles; solid content 70%)-Binder resin ... ... 100 parts (Chuo Rika Co., Ltd., BE-920, solid content 50%)

(Example 2) Silica powder having an average particle size of 2.2 µm (Mizukasil P7, manufactured by Mizusawa Chemical Industry Co., Ltd.)
07, bulk specific gravity; 0.13 g / cm ³ ) air permeability; 1 second /
100 cc of acrylic fiber non-woven fabric (manufactured by Asahi Kasei Kogyo Co., Ltd., trade name: Shalelia C-1030), which was packaged with a pressed product, placed in an aluminum package film, heat-sealed in a state of being evacuated to 10 torr, The heat insulating sheet was vacuum packaged. This vacuum-packaged heat-insulating sheet had a thermal conductivity of 0.05 kcal / mh ° C. when the thickness was 20 mm.

Example 3 Ethanol, water, and 0.1%
By mixing with an aqueous solution of 01 mol / liter of ammonia,
Oligomers of tetramethoxysilane having an average molecular weight of 470 (trade name; manufactured by Colcoat Co., Ltd .; methyl silicate 5)
1), gradually added, tetramethoxysilane oligomer: ethanol: water: aqueous ammonia solution = 1: 12
A reaction solution having a mixing ratio of 0: 20: 2.16 (molar ratio) (=
Sol). The obtained sol was poured into a container and allowed to stand at room temperature to be gelled to obtain a gel compound.

The obtained gel compound was heated at a temperature of 18 ° C.
After performing an operation of replacing ethanol in the gel with carbon dioxide in carbon dioxide at a pressure of 55 kg / cm ² for 3 hours, the temperature was set to 80 ° C. and the pressure was 160 kg / cm ² , which are the critical conditions for carbon dioxide. Supercritical drying was performed for 10 hours to remove the solvent. Next, hexamethylene disilazane as a hydrophobizing agent is added to the atmosphere in the supercritical state at a rate of 0.3 mol / liter, and the hydrophobizing agent is diffused into the supercritical fluid over 2 hours. Then, the gel was allowed to stand in the supercritical fluid and subjected to a hydrophobic treatment. Thereafter, the pressure was reduced after flowing carbon dioxide in a supercritical state, and the ethanol and the hydrophobizing agent contained in the gel compound were removed.

From the introduction of the above hydrophobizing agent to the decompression, 15
After the time was required, the airgel block in the container was taken out, and the airgel blocks were piled up in layers of 0.05 kg / kg.
Each airgel block was adhered by applying a pressure of cm ² to obtain a bulk airgel having a thickness of 30 mm. The thermal conductivity in this state is 0.01 kcal / mh ° C.
Met.

Using the obtained airgel having a thickness of 30 mm, a heat insulating sheet vacuum-packaged in the same manner as in Example 2 was obtained.

(Preparation of Roofing Material) A heat ray reflective paint (Nagashima Special Paint Co., Ltd.) containing an acrylic resin emulsion and ceramic beads on the surface of an aluminum plate having a thickness of 1.0 mm.
(Trade name: Thermoshield) coated with 200 g / m ² was used as a roofing material, and the heat insulating sheets obtained in Examples 1, 2, and 3 above were all insulated on the back surface. The heat-insulating sheets were laminated so that the total thickness became 30 mm, and three types of heat-insulating roofing materials were prepared. The obtained heat-insulating roof material was applied to a roof, and the change in the temperature of the attic was examined. As a result, good heat insulating properties were exhibited in both summer and winter.

[0044]

According to the first aspect of the present invention, a high-performance heat insulating roofing material can be provided by providing a thin heat insulating layer on the back surface. According to the second aspect of the present invention, by interposing the fibrous base material, it is possible to provide a heat insulating roof material having high performance and excellent adhesion of the heat insulating layer. According to the third aspect of the present invention, it is possible to provide a high-performance heat-insulating roofing material in which the heat-insulating layer is made of an airgel containing at least one of silica and carbon. According to the fourth aspect of the present invention, since the heat-insulated layer is vacuum-packed, a heat-insulating roof material having higher performance can be provided. According to the invention of claim 5, in addition to the effect of the invention of claim 4, the heat insulating layer is made of silica,
Since it is made of an airgel containing at least one of carbon, it is possible to provide a heat insulating roofing material having higher performance.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a structure in which a heat insulating layer is laminated on the back surface of a roofing material (tile).

FIG. 2 is a cross-sectional view of a structure in which a heat insulating layer is laminated on the back surface of a metal roofing material.

FIG. 3 is a cross-sectional view of a heat insulating layer made of airgel.

FIG. 4 is a cross-sectional view of a heat insulating layer made of airgel which is hermetically packaged.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Roofing material 2 Tile or metal roofing material 3 Insulation layer 4 Roof base 5 Tile bar 6 Nail 7 Fiber base material 8 Polymer binder 10 Adhesive layer

Claims (5)

[Claims] 1. A heat-insulating roofing material characterized in that a heat-insulating layer made of a polymer binder containing hollow particles and / or air bubbles is laminated on the back surface of a roofing material made of metal or ceramics. 2. A heat insulating layer having a structure in which a polymer binder containing hollow particles and / or air bubbles is laminated on at least one surface of a fibrous base material on the back surface of a roof material made of metal or ceramics. The heat-insulating roofing material according to claim 1, wherein the roofing material is used. 3. A heat-insulating roofing material characterized in that a heat-insulating layer made of an airgel containing at least either silica or carbon is laminated on the back surface of a roofing material made of metal or ceramics. 4. A heat-insulating roofing material characterized in that a heat-insulating layer formed by vacuum-packing a heat-insulating material is laminated on the back surface of a roofing material made of metal or ceramics. 5. The heat-insulating roofing material according to claim 4, wherein the heat-insulating layer is made of an airgel containing at least either silica or carbon.