JP2023006352A - insulation board - Google Patents

Abstract

To provide an insulation board with a novel constitution having satisfactory fire retardancy.SOLUTION: An insulation board 10 in which a metal plate 21 is adhered at least to one face of a core material 11 with an adhesive agent 25, where the core material 11 is constituted by a laminate board in which a covering material 15 is adhered to both surfaces of a foamed body 13. It is preferable that the foamed body 13 be a polyisocyanurate foamed body. It is preferable that the covering material 15 be a surface material including a metal foil or papers to which fire retardancy is imparted. An aluminum foil is exemplified as the metal foil. An aluminum hydroxide paper, calcium carbonate paper or the like is exemplified as papers to which fire retardancy is imparted. It is preferable that the metal plate 21 be a molten metal plated steel sheet or a painting molten steel sheet.SELECTED DRAWING: Figure 1

Description

The present invention relates to an insulation board.

2. Description of the Related Art As a heat insulating board used for the interior of a building, there is a board in which a face member made of a metal plate is adhered to at least one surface of a core panel made of polyurethane foam (Patent Document 1).

Japanese Patent No. 6117972

However, there is a need for insulating boards of new construction with good flame retardancy.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a heat insulating board having a novel structure and good flame retardancy.

Means for solving the problems of the present invention is a heat insulating board having a core material with a metal plate adhered to at least one side, wherein the core material is a laminate board in which a covering material is adhered to both sides of a foam. Characterized by

According to the present invention, the core material is composed of a laminate board in which coating materials are adhered to both sides of the foam, so that better flame retardancy can be obtained than when there is no coating material.

1 is a cross-sectional view of an insulation board according to one embodiment of the present invention; FIG. It is a table|surface which shows a structure and the measurement result of a cone calorimeter test about a comparative example and each Example.

A heat insulating board 10 according to one embodiment of the present invention shown in FIG. The metal plate 21 is not limited to being adhered to both sides of the core material 21 as in this embodiment, and may be adhered to only one side.
The core material 11 is composed of a laminate board in which covering materials 15 are adhered to both sides of a foam 13 .
The thickness of the foam 13 is appropriately set, and an example is 10 to 200 mm.
As a material for the foam 13, a rigid polyurethane foam, a polyisocyanurate foam, or the like, which is excellent in heat insulation, is preferable. The polyisocyanurate foam is also excellent in flame retardancy, so it is suitable as a constituent material of the core material 11 in the heat insulating board 10 .

Polyisocyanurate foam is foamed from a composition containing polyol, blowing agent, catalyst, foam stabilizer, polyisocyanate, auxiliary agent, etc., using a specific catalyst and excessive polyisocyanate. It is different from rigid polyurethane foam in that it The density of the polyisocyanurate foam is 25-60 kg/m ³ , preferably 30-45 kg/m ³ . If the density is lower than this range, the strength of the foam is weak, and if the density is higher, the heat insulation performance is lowered, the weight per unit area is increased, and the workability is deteriorated.

The components constituting the composition for polyisocyanurate foam will be described.
Any of polyether polyols, polyester polyols and polyether ester polyols may be used as the polyol, and one or more of them may be used in combination.

Examples of polyether polyols include polyhydric alcohols such as ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, butylene glycol, neopentyl glycol, glycerin, pentaerythritol, trimethylolpropane, sorbitol, sucrose, and ethylene oxide (EO). and polyether polyols to which alkylene oxides such as propylene oxide (PO) are added.

Examples of polyester polyols include polycondensation of aliphatic carboxylic acids such as malonic acid, succinic acid and adipic acid, aromatic carboxylic acids such as phthalic acid, and aliphatic glycols such as ethylene glycol, diethylene glycol and propylene glycol. Mention may be made of the polyester polyols obtained.

Examples of polyether ester polyols include those obtained by reacting polyether polyols with polybasic acids to form polyesters, and those having both polyether and polyester segments in one molecule.

As the blowing agent, water, which is a chemical blowing agent, or a hydrocarbon such as pentane, which is a physical blowing agent, or a hydrofluoroolefin can be used alone or in combination. When water is used as a blowing agent, it reacts with polyisocyanate to generate carbon dioxide gas, and the carbon dioxide gas causes foaming of the composition. The amount of blowing agent is suitable.

As the catalyst, a trimerization catalyst alone or a combination of a trimerization catalyst and a urethanization catalyst can be used.
Examples of trimerization catalysts include: 1) metal oxides such as lithium oxide, sodium oxide and potassium oxide; 2) alkoxides such as sodium methoxy, sodium ethoxy, sodium propoxy and sodium butoxy; 3) potassium acetate and 2-ethyl 4) 2,4,6-tris(dimethylaminomethyl)phenol, 2,4-bis(dimethylaminomethyl)phenol, 2, Tertiary amines such as 4,6-tris(dialkylaminoalkyl)hexahydro-S-triazine, N,N′,N″-tris(dimethylaminopropyl)hexahydrotriazine, triethylenediamine; 5) derivatives of ethyleneimine; 6) Alkali metal, aluminum, acetylacetone chelates of transition metals, quaternary ammonium salts and the like.
These trimerization catalysts can be used alone or in combination of two or more. Among them, it is more preferable to use organic metal salts and quaternary ammonium salts. Suitable organometallic salts include a combination of potassium acetate and potassium octylate.

Examples of urethanization catalysts include triethylamine, tripropylamine, tributylamine, N-methylmorpholine, N-ethylmorpholine, dimethylbenzylamine, triethylenediamine, 2-methyltriethylenediamine, N,N,N',N'-tetra Amine catalysts such as methylhexamethylenediamine, bis-(2-dimethylaminoethyl) ether, dimethylethanolamine, tin catalysts such as stannus octoate, metal catalysts such as phenylmercuric propionate or lead octenate (organometallic Also called a catalyst.) can be mentioned.
A preferred amount of catalyst is 0.8 to 7 parts by weight per 100 parts by weight of the composition.

A known foam stabilizer can be used. Examples thereof include silicone-based foam stabilizers, fluorine-containing compound-based foam stabilizers, and known surfactants. The amount of foam stabilizer is preferably 0.2 to 3.0 parts by weight per 100 parts by weight of the composition.

An aromatic polyisocyanate is used as the polyisocyanate. Examples of aromatic polyisocyanates include toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), naphthalene diisocyanate, xylylene diisocyanate, polymeric polyisocyanate (crude MDI), and the like. Polyisocyanate may use 2 or more types together.

The amount of polyisocyanate is preferably such that the isocyanate index is 300-1000, more preferably 400-900. When the isocyanate index is less than 300, the polyisocyanurate foam becomes flammable and prone to thermal shrinkage, whereas when it is greater than 1000, the polyisocyanurate foam becomes brittle, resulting in compressive strength, bending physical properties, etc. is not preferable as a structure. The definition of the isocyanate index is a value obtained by dividing the number of moles of isocyanate groups in polyisocyanate by the total number of moles of active hydrogen groups such as hydroxyl groups of polyol and water as a blowing agent and multiplying the value by 100. [(Polyisocyanate Parts by weight/NCO equivalent of polyisocyanate)/(active hydrogen component weight/active hydrogen equivalent)×100].

Examples of auxiliary agents include flame retardants and colorants. Flame retardants include halogenated polymers such as polyvinyl chloride, chloroprene rubber, and chlorinated polyethylene; phosphoric esters and halogenated phosphoric ester compounds; organic flame retardants such as melamine resins and urea resins; Inorganic flame retardants such as aluminum can be used. The amount of the flame retardant is preferably 0.5 to 20 parts by weight, more preferably 5 to 16 parts by weight, still more preferably 8 to 16 parts by weight, based on 100 parts by weight of the composition.
Examples of coloring agents include pigments, dyes, and carbon.

The compositions are mixed in known foaming equipment to react and foam to form a polyisocyanurate foam.
In the case of a composition for rigid polyurethane foam, the composition reacts and foams by being mixed in a known foaming device to form a rigid polyurethane foam.

The covering material 15 is made of a thin material, such as a face material containing metal foil or a face material containing flame-retardant paper.
The material of the metal foil is not limited, and examples thereof include aluminum foil, copper foil, brass foil, stainless steel foil, tin foil, iron foil, and nickel foil. Aluminum foil is the preferred metal foil because it is easy to handle and inexpensive. The thickness of the metal foil is preferably 6-100 μm. If the metal foil is too thick, the insulation board 10 becomes heavy and difficult to handle.

Non-combustible paper or flame-retardant paper is preferable as the paper to which flame-retardant properties are imparted. Noncombustible papers include those impregnated or filled with aluminum hydroxide or calcium carbonate, such as aluminum hydroxide paper and calcium carbonate paper. The flame-retardant paper includes those containing a flame retardant and those coated with a flame retardant. Both non-combustible paper and flame-retardant paper are sometimes called “non-combustible paper” or “flame-retardant paper”.

Lamination adhesion of the foam 13 and the covering material 15 is performed by mixing and injecting the composition between the two covering materials 15, 15 separated by a predetermined distance, and foaming to form a foam, and The covering material 15 can be adhered to both sides of the foam 13 by the method.

The metal plate 21 has the effect of increasing the rigidity and durability of the insulation board 10 . As the metal plate 21, various steel plates are preferable, and hot-dip metal plated steel plates, coated hot-dip metal plated steel plates, and the like can be mentioned.

Examples of hot-dip metal plated steel sheets include hot-dip galvanized steel sheets (GI steel sheets), hot-dip 55% aluminum-galvanized steel sheets (galvalume steel sheets (GL steel sheets, registered trademark)), and the like.
A hot-dip 55% aluminum-galvanized steel sheet (Galvalume steel sheet (GL steel sheet, registered trademark)) is a preferable steel sheet because it has better heat resistance than hot-dip galvanized steel sheet (GI steel sheet).

Since the surface of the coated hot-dip metal plated steel sheet is coated, it is possible to impart decorativeness and improve corrosion resistance.
Examples of the painted hot dip galvanized steel sheet include painted hot dip galvanized steel sheet (painted GI steel sheet), painted hot dip 55% aluminum-galvanized steel sheet (painted galvalume steel sheet (painted GL steel sheet, registered trademark)), and the like.
Painted hot-dip 55% aluminum-galvanized steel sheets (painted GL steel sheets) are preferable steel sheets because they are superior in heat resistance to painted hot-dip galvanized steel sheets (painted GI steel sheets).

The metal plate 21 is adhered to the surface of the core material 11 with an adhesive 25 . The adhesive 25 is not particularly limited as long as it can be used for bonding metal plates, and may be a chloroprene rubber (CR) adhesive, a urethane resin adhesive, an epoxy resin adhesive, or an acrylic resin adhesive. etc. can be mentioned.

The bonding between the core material 11 and the metal plate 21 is performed by applying an adhesive 25 to one or both of the core material 11 and the metal plate 21, laminating the core material 11 and the metal plate 21 via the applied adhesive 25, and bonding. This is done by curing the agent 25 .
The method of applying the adhesive 25 is not limited, and examples thereof include spray application and roll coater application.
The amount of adhesive 25 is preferably 50-600 g/m ² , more preferably 100-400 g/m ² . If the amount of the adhesive 25 is too small, the adhesive force between the core material 11 and the metal plate 21 is lowered, and conversely, if the amount of the adhesive 25 is too large, flame retardancy is lowered.

The flame retardance of the heat insulating board 10 is judged by the measurement result of the cone calorimeter test (ISO5660 compliant).
The cone calorimeter test is a test in which a sample is heated by irradiating 50 kW/m ² with a radiant electric heater, the calorific value is measured, and noncombustible materials are evaluated according to the evaluation criteria.

Evaluation requirements for the results of the cone calorimeter test include the following (1) to (3).
(1) Total calorific value is 8 MJ/m ² or less.
(2) There should be no cracks or holes penetrating to the back side that are harmful in terms of fire prevention.
(3) The maximum heat release rate shall not exceed 200 kW/ ^m2 continuously for 10 seconds or longer.
It is classified into incombustible, semi-incombustible, and flame-retardant as follows, depending on the duration for which all of the evaluation requirements (1) to (3) can be satisfied.

The criteria for noncombustibility are to satisfy all of (1) to (3) within 1200 seconds (20 minutes) after the start of heating.
The semi-noncombustible standard is to satisfy all of (1) to (3) within 600 seconds (10 minutes) after the start of heating.
The criteria for flame retardancy are to satisfy all of (1) to (3) within 300 seconds (5 minutes) after the start of heating.

In the heat insulating board 10 of the present invention, the core material 11 is composed of a laminate board in which the covering material 15 is adhered to both sides of the foam 13, so that the total calorific value in the cone calorimeter test is is smaller than when the coating material 15 is not present in the inner wall, and the flame retardancy is improved.

The heat insulating boards of each comparative example and each example shown in FIG. 2 were produced as follows.
Using a mold (foaming mold) composed of a lower mold and an upper mold, coating materials are placed on the bottom surface of the cavity of the lower mold and on the mold surface of the upper mold, respectively, and the composition is heated at 15 ° C. at 5000 rpm. A required amount of the mixture was stirred with a propeller stirrer for 10 seconds, injected into the cavity, and foamed to prepare a laminate board in which the covering material was adhered to both sides of the foam, which was used as the core material of the example.

The cavity of the mold has planar dimensions of 300 mm×300 mm, and the thickness (depth) is the thickness shown in the column of the structure of the core material in FIG. 2 .
The injection amount of the composition into the cavity is adjusted so as to achieve the density shown in the composition column of the core material in FIG.
As the covering material, a face material containing aluminum foil or a face material containing flame-retardant paper shown in the composition column of the core material in FIG. 2 was used. The surface material containing aluminum foil has an epoxy resin coating layer of 3.0 g/m ² from the foam 13 side, the thickness of the aluminum foil is 20 μm in Examples 1 to 3 and 15, and 20 μm in Examples 4 to 7 and 9 to 11. A 35 μm aluminum surface material manufactured by UACJ Co., Ltd. is used, and in Examples 12 and 13, polyethylene film 45 μm, kraft paper 120 g/m ² , polyethylene film 20 μm, aluminum 7 μm, and polyethylene film 15 μm are used from the foam 13 side. A laminated aluminum craft face material manufactured by Nihon Matai Co., Ltd. was used. In Examples 8 and 14, a laminate of 50 μm polyethylene film and 150 g/m 2 calcium carbonate paper processed by Dai Nippon Printing Co., Ltd. was used as the face material containing flame-retardant paper. For the core materials of Comparative Examples 1 to 4, foaming was performed without placing the covering material in a mold, and the core material was composed only of the resulting foam.

Each component of the composition is as shown below. In the following description, the term "total amount of composition" refers to the composition in which all the components from the following polyester polyol to polyisocyanate are blended.
Polyester polyol: aromatic polyester polyol, hydroxyl value: 400 mgKOH/g, number of functional groups: 2, product name: MAXIMOL RDK-142, manufactured by Kawasaki Kasei Co., Ltd.... 100 parts by weight Diethylene glycol: hydroxyl value: 1057 mgKOH/g... 3.0 weight ratio Foaming agent: Silicone type, product name: Niax Silicone L-6638, manufactured by MOMENTIVE... 4.5 parts by weight Foaming agent: Cyclopentane... 6.5 parts by weight is contained when the total amount of the composition is 100 parts by weight. Catalyst: trimerization catalyst, product name: TMR-7, manufactured by Evonik Japan Co., Ltd. Adjusted so that it contains 3.0 parts by weight when the total amount of the composition is 100 parts by weight Flame retardant: Tris (1-chloro-2-propyl) phosphate (TCPP), product name: Leverguard PP, manufactured by LANXESS Co., Ltd. Adjusted so that the flame retardant content in FIG. 2 is obtained when the total amount of the composition is 100 parts by weight Poly Isocyanate: polymeric MDI, NCO%: 31.3, product name: Lupranate M20S, manufactured by BASF In addition, Examples 1 to 14 and Comparative Examples 1 to 4 were adjusted so that the isocyanate index (INDEX) was 425, and 15 was adjusted so that the isocyanate index (INDEX) was 860.

As the adhesive applied to both sides of the core material, in Example 7, a urethane-based adhesive, product name: Oshikadyne TU-318, manufactured by Oshika Co., Ltd. was used, and in other examples and comparative examples, a chloroprene rubber-based adhesive was used. (CR-based) adhesive, product name 8240NTH, manufactured by No Tape Industry Co., Ltd. was used. The adhesive was applied in the amount shown in FIG. 2 by a roll coater method and dried for 5 minutes. After that, a metal plate of the kind shown in FIG. 2 was placed on the adhesive, pressed with a force of 1 kg/m ² and released after 12 hours to obtain an insulating board. In addition, the "painted GL steel sheet" in the type of metal plate in Fig. 2 is a painted hot dip 55% aluminum-galvanized steel sheet (manufactured by JFE Steel Sheet), and the "painted GI steel sheet" is a painted hot dip galvanized steel sheet (JFE steel sheet). Co., Ltd.), and “GL steel plate” is an unpainted hot-dip 55% aluminum-galvanized steel plate (manufactured by JFE Steel Sheet Co., Ltd.).

For each comparative example and each example, a cone calorimeter test was performed in accordance with ISO5660 using a cone calorimeter C4 manufactured by Toyo Seiki Seisakusho Co., Ltd. The total calorific value and maximum calorific value obtained by cone calorimeter test at 5, 10 and 20 minutes are shown in FIG.

The configuration, total heat value, and maximum heat value of each comparative example and each example will be described below.
・Comparative example 1
Comparative Example 1 is an example in which there is no covering material on ^both sides of the foam. 300 g/m ² , the metal plate is a painted GL steel plate.
The results of the cone calorimeter test of the comparative example were a total calorific value of 5.32 MJ/m ² in 5 minutes, 5.84 MJ/m ² in 10 minutes, 6.20 MJ/m ² in 20 minutes, and a maximum heat release rate of It was 18.05kW/ ^m2 .

・Example 1
In Example 1, the thickness of the core material is 50 mm, the content of the flame retardant is 11%, the density of the core material is 36 kg/m ² , the coating material is an aluminum foil with a thickness of 20 μm, the adhesive is CR-based, and the amount of adhesive is 300 g/m. ^2. A metal plate is an example of a coated GL steel plate.
The cone calorimeter test results for Example 1 showed a total heat release of 1.31 MJ/m ² in 5 minutes, 2.22 MJ/m ² in 10 minutes, 2.67 MJ/m ² in 20 minutes, and a maximum heat release rate of It is 12.55 kW/m ² , and compared to Comparative Example 1, both the total heat generation amount and the maximum heat generation rate are small, and the flame retardancy is high.

・Example 2
Example 2 is an example in which the metal plate is a coated GI steel plate, and other configurations are the same as those of Example 1.
The results of the cone calorimeter test for Example 2 were a total heat release of 4.17 MJ/m ² at 5 minutes, 7.38 MJ/m ² at 10 minutes, 8.13 MJ/m ² at 20 minutes, and a maximum heat release rate of It is 23.63 kW/m ² , and both the total heat generation amount and the maximum heat generation rate are larger than in Example 1 in which the coated GL steel plate is used as the metal plate, and the flame retardancy is lowered.
・Comparative example 2
Comparative Example 2 is an example in which there is no covering material on both sides of the foam, and other configurations are the same as those in Example 2.
The results of the cone calorimeter test for Comparative Example 2 were a total calorific value of 5.67 MJ/m ² in 5 minutes, 9.41 MJ/m ² in 10 minutes, 10.58 MJ/m ² in 20 minutes, and a maximum heat release rate of It is 32.42 kW/m ² , and both the total calorific value and the maximum heat generation rate are larger than those of Example 2, and the flame retardancy is lowered.

・Example 3
Example 3 is an example in which the metal plate is an uncoated GL steel plate. Another configuration has a core thickness of 50 mm, a flame retardant content of 0.6%, a core density of 32 kg/m ² , a coating material of aluminum foil with a thickness of 20 μm, a CR-based adhesive, and an adhesive amount of 300 g. / ^m2 .
The results of the cone calorimeter test for Example 3 were a total heat release of 0.11 MJ/m ² in 5 minutes, 0.23 MJ/m ² in 10 minutes, 0.54 MJ/m ² in 20 minutes, and a maximum heat release rate of It is 1.74 kW/m ² , and compared to Examples 1 and 2 in which coated GL steel plates are used as metal plates, both the total heat value and the maximum heat release rate are small, and the flame retardancy is high. .

・Examples 4 to 6
Examples 4 to 6 are examples in which the thickness of the core material and the content of the flame retardant were varied.
In Example 4, the thickness of the core material is 20 mm, the content of the flame retardant is 11%, the density of the core material is 36 kg/m ² , the coating material is an aluminum foil with a thickness of 35 μm, the adhesive is CR-based, and the amount of adhesive is 300 g/m. ^2. The metal plate is a coated GL steel plate.
Cone calorimeter test results for Example 4 show a total heat release of 2.50 MJ/m ² in 5 minutes, 3.48 MJ/m ² in 10 minutes, 4.31 MJ/m ² in 20 minutes, and a maximum heat release rate of 13.40 kW/ ^m2 .

In Example 5, the thickness of the core material is 50 mm, the content of the flame retardant is 8%, the density of the core material is 36 kg/m ² , the covering material is an aluminum foil with a thickness of 35 μm, the adhesive is CR-based, and the amount of adhesive is 300 g/m. ^2. The metal plate is a coated GL steel plate.
Cone calorimeter test results for Example 5 show a total heat release of 1.30 MJ/m ² in 5 minutes, 2.50 MJ/m ² in 10 minutes, 2.87 MJ/m ² in 20 minutes, and a maximum heat release rate of 6.44 kW/ ^m2 .
In Example 5, since the thickness of the core material was increased from 20 mm in Example 4 to 50 mm, both the total calorific value and the maximum heat release rate were smaller than those in Example 4, and flame retardancy was enhanced. .

In Example 6, the thickness of the core material is 50 mm, the content of the flame retardant is 5%, the density of the core material is 36 kg/m ² , the coating material is an aluminum foil with a thickness of 35 μm, the adhesive is CR-based, and the amount of adhesive is 300 g/m. ^2. The metal plate is a coated GL steel plate.
The cone calorimeter test results for Example 6 showed a total heat release of 3.50 MJ/m2 in 5 minutes, 3.95 MJ/ ^m2 in 10 minutes, 4.31 MJ/ ^m2 in ²⁰ minutes, and a maximum heat release rate of 7.97 kW/ ^m2 .
In Example 6, the flame retardant content was reduced from 8% in Example 5 to 5%, so both the total calorific value and the maximum heat release rate increased compared to Example 5, and the flame retardancy decreased. bottom.

・Example 7
Example 7 is an example in which a urethane ^- based adhesive is used between the core material and the metal plate. aluminum foil, the adhesive is urethane-based, the amount of adhesive is 300 g/m ² , and the metal plate is a coated GL steel plate.
Cone calorimeter test results for Example 7 show a total heat release of 7.27 MJ/m ² at 5 minutes, 8.39 MJ/m ² at 10 minutes, 9.69 MJ/m ² at 20 minutes, and a maximum heat release rate of 62.50 kW/ ^m2 .
In Example 7, by using a urethane-based adhesive as an adhesive between the metal plate and the core material, both the total heat generation amount and the maximum heat generation rate are large compared to other examples using a CR-based adhesive. and the flame retardancy decreased.
・Comparative example 3
Comparative Example 3 is an example in which there is no covering material on both sides of the foam, and other configurations are the same as those in Example 7.
The results of the cone calorimeter test for Comparative Example 3 were 8.15 MJ/m ² in 5 minutes, 10.27 MJ/m ² in 10 minutes, 11.86 MJ/m ² in 20 minutes, and a maximum heat release rate of 84.32 kW/ ^m2 .
Compared to Example 7, both the total heat generation amount and the maximum heat generation rate are increased, and the flame retardancy is lowered.

・Example 8
Example ⁸ is an example in which calcium carbonate paper is used as the covering material. The adhesive is CR-based, the amount of adhesive is 300 g/m ² , and the metal plate is coated GL steel plate.
The results of the cone calorimeter test for Example 8 were 1.59 MJ/m ² in 5 minutes, 2.92 MJ/m ² in 10 minutes, 3.59 MJ/m ² in 20 minutes, and a maximum heat release rate of 7.62 kW/ ^m2 .

・Examples 9 to 11
Examples 9 to 11 are examples in which the amount of adhesive is varied. Other configurations are the same as in Examples 9 to 11, with a core thickness of 20 mm, a core density of 36 kg/m ² , a covering material of aluminum foil with a thickness of 35 μm, a CR-based adhesive, and a coated metal plate. GL steel plate.

Example 9 has an adhesive amount of 150 g/m ² and cone calorimeter test results of 0.53 MJ/m ² in 5 minutes, 0.67 MJ/m ² in 10 minutes, 20 0.83 MJ/m ² per minute and a maximum heat release rate of 4.33 kW/m ² .
Example 10 has an adhesive amount of 400 g/m ² and cone calorimeter test results of 3.36 MJ/m ² in 5 minutes, 3.86 MJ/m ² in 10 minutes, 20 5.20 MJ/m ² per minute and a maximum heat release rate of 48.61 kW/m ² .
Example 11 has an adhesive amount of 500 g/m ² and cone calorimeter test results of 5.29 MJ/m ² in 5 minutes, 6.12 MJ/m ² in 10 minutes, 20 7.52 MJ/m ² per minute and a maximum heat release rate of 47.93 kW/m ² .
Cone calorimeter test results for Examples 9-11 show that as the amount of adhesive increases, the total heat release increases and flame retardancy decreases.

・Comparative example 4
Comparative Example 4 is an example in which there is no covering material on both sides of the foam, and other configurations are the same as in Example 11.
The results of the cone calorimeter test for Comparative Example 4 were a total heat release of 7.86 MJ/m ² in 5 minutes, 8.61 MJ/m ² in 10 minutes, 10.05 MJ/m ² in 20 minutes, and a maximum heat release rate of 60.75 kW/ ^m2 .
Compared to Example 7, both the total heat generation amount and the maximum heat generation rate are increased, and the flame retardancy is lowered.

・Example 12
Example 12 is an example in which aluminum kraft paper having a thickness of 267 μm is used as the covering material, and other configurations are the same as those of Example 8.
The cone calorimeter test results for Example 12 show a total heat release of 0.95 MJ/m ² at 5 minutes, 1.34 MJ/m ² at 10 minutes, 2.36 MJ/m ² at 20 minutes, and a maximum heat release rate of 30.96 kW/ ^m2 .
・Example 13
Example 13 is an example in which the metal plate is a coated GI steel plate, and other configurations are the same as those of Example 12.
The results of the cone calorimeter test for Example 13 were a total heat release of 2.16 MJ/m2 in 5 minutes, 2.88 MJ/ ^m2 in 10 minutes, 4.02 MJ/ ^m2 in ²⁰ minutes, and a maximum heat release rate of 33.46 kW/ ^m2 .

・Example 14
Example 14 is an example in which the metal plate is a coated GI steel plate, and other configurations are the same as in Example 8.
Cone calorimeter test results for Example 14 show a total heat release of 3.25 MJ/m ² in 5 minutes, 4.43 MJ/m ² in 10 minutes, 5.37 MJ/m ² in 20 minutes, and a maximum heat release rate of 18.50 kW/ ^m2 .

・Example 15
Example 15 is an example in which the isocyanate index is 860, and other configurations are the same as in Example 1.
The cone calorimeter test results for Example 15 showed a total heat release of 4.50 MJ/m ² at 5 minutes, 4.96 MJ/m ² at 10 minutes, 5.13 MJ/m ² at 20 minutes, and a maximum heat release rate of 15.44 kW/ ^m2 .

As described above, the heat insulating board of the present invention has good flame retardancy because the core material is composed of the laminate board in which the covering material is adhered to both sides of the foam.
It should be noted that the present invention is not limited to the embodiments, and can be modified without departing from the gist of the invention.

REFERENCE SIGNS LIST 10 Insulation board 11 Core material 13 Foam 15 Coating material 21 Metal plate 25 Adhesive

Claims (7)

In an insulation board in which a metal plate is adhered to at least one side of a core material,
A heat insulating board, wherein the core material is a laminate board in which covering materials are adhered to both sides of a foam. 2. The insulation board of claim 1, wherein said foam is polyisocyanurate foam. The insulation board according to claim 1 or 2, wherein the covering material is a face material containing metal foil. 3. The insulation board according to claim 1, wherein the covering material is a face material containing papers imparted with flame retardancy. The heat insulation board according to any one of claims 1 to 4, wherein the metal plate is a hot-dip metal plated steel plate. The heat insulating board according to any one of claims 1 to 4, wherein the metal plate is a coated hot-dip metal plated steel plate. The heat insulating board according to any one of claims 1 to 6, wherein the amount of adhesive for bonding the core material and the metal plate is 50 to 600 g/ ^m2 .

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