JP6214923B2 - Non-combustible coating material, non-combustible heat insulating material, and method for constructing non-combustible heat insulating material - Google Patents

Description

  The present invention particularly relates to a non-combustible technology for a foamed resin heat insulating material.

  Structures (for example, building structures and civil engineering structures) are constructed of materials such as steel, concrete, mortar, stone, brick, wood, tile, plaster, glass, and earth. A structure constructed of these materials generally has a high thermal conductivity. Therefore, since heat easily escapes, air conditioning efficiency is poor. In order to solve this problem, a heat insulating material is used. A foamed resin (for example, beaded polystyrene foam, extruded polystyrene foam, rigid urethane foam, etc.) is known as a heat insulating material. However, many foamed resins are flammable. For this reason, there is a fear of fire due to ignition.

Japanese Patent No. 3240308

  Therefore, it is conceivable to provide a fireproof coating mortar on the surface of the foamed resin heat insulating material. That is, it was considered that if fire-resistant mortar was provided on the surface of the foamed resin, the risk of fire would be reduced.

  Japanese Patent No. 3240308 (Patent Document 1) discloses a fireproof coating material. For example, with respect to 100 parts by weight of an inorganic binder containing at least hydraulic cement, 15 parts by weight to 500 parts by weight of an endothermic substance, a light weight blended with an inorganic lightweight aggregate and an organic lightweight aggregate in a ratio of 2: 1 to 20: 1 There is a disclosure of a fireproof covering material comprising 12 parts by weight to 220 parts by weight of aggregate and 100 parts by volume of the lightweight aggregate with respect to 100 parts by volume of the inorganic binder and the endothermic substance. In addition, a light-weight blending ratio of 15 to 500 parts by weight of an endothermic substance, inorganic light-weight aggregate and organic light-weight aggregate in a ratio of 2: 1 to 20: 1 with respect to 100 parts by weight of an inorganic binder containing at least hydraulic cement. While adding 12 parts by weight to 220 parts by weight of aggregate and 300 parts by weight or less of the inorganic filler, 100 to 300 parts by weight of the lightweight aggregate with respect to 100 parts by volume of the inorganic binder, endothermic substance, and inorganic filler. There is a disclosure of a fireproof coating material that is a volume part. The endothermic material is, for example, aluminum hydroxide. The inorganic lightweight aggregate is, for example, pearlite. The organic lightweight aggregate is, for example, expanded polystyrene. Glass fiber (or rock wool fiber) is optionally included.

  Now, the fireproof coating material of the said patent document 1 was provided in the foamed resin material surface. The fire resistance of this material was examined. As a result, it was found that the fire resistance was poor. The reason was thought to be as follows. The fireproof covering material is harder than the foamed resin heat insulating material. And the said refractory coating | covering material and a foamed resin-type heat insulating material differ greatly in the dimension change characteristic by a heat | fever, drying, etc. Therefore, when the surface of the foamed resin-based heat insulating material is covered with the fireproof coating material, peeling is likely to occur at the interface between the fireproof coating material and the foamed resin-based heat insulating material. In addition, such a problem was not pointed out by the said patent document 1 because the fireproof coating material of the said patent document 1 was not with respect to a foamed resin material but with respect to the iron raw material.

  As a fireproof covering material, spray rock wool made of rock wool, cement and water is known.

  This kind of fireproof coating material was provided on the surface of the foamed resin material. The fire resistance of this material was examined. As a result, the total calorific value in the exothermic test prescribed in JIS A 5430 was a small value. The material was non-flammable. However, the foamed resin insulation was burnt. This greatly reduced the thickness of the material. When the thickness of the heat insulating material is reduced, the heat insulating property is greatly reduced.

  Therefore, the problem to be solved by the present invention is to solve the above problems. For example, when the surface of a foamed resin material is coated, the technology is to provide a technique that causes little deterioration in heat insulating properties even when exposed to high temperatures (the foamed resin-based heat insulating material is hardly damaged). Alternatively, for example, it is to provide a technology in which a foamed resin heat insulating material is difficult to burn. In particular, the present invention provides a technique in which even when exposed to high temperatures, there is little deterioration in heat insulation properties (the foamed resin-based heat insulating material is difficult to be damaged) and the foamed resin-based heat insulating material is difficult to burn.

The present invention
It is a non-combustible coating material for foamed resin insulation,
With rock wool,
Cement,
An incombustible coating material characterized by having aluminum hydrates is proposed.

The present invention
The incombustible coating material, preferably, the total amount of cement and aluminum hydrate is 50 to 300 parts by mass with respect to 100 parts by mass of rock wool, and the amount of aluminum hydrates is An incombustible coating material is proposed, which is 30 to 90 parts by mass with respect to 100 parts by mass of the total amount of cement and aluminum hydrates.

The present invention
A non-combustible coating material is proposed, wherein the aluminum hydrates preferably have an average particle size of 1 to 120 μm.

The present invention
An incombustible coating material is proposed, wherein the aluminum hydrate is preferably aluminum hydroxide.

The present invention
A foamed resin insulation,
Proposed is a nonflammable heat insulating material comprising the nonflammable coating material provided on the surface of the foamed resin heat insulating material.

The present invention
An incombustible heat insulating material is proposed, which is characterized in that an adhesive is preferably provided between the foamed resin heat insulating material and the incombustible coating material.

The present invention
Providing a foamed resin-based heat insulating material on the surface of the structure;
The present invention proposes a method for constructing a non-combustible heat insulating material, comprising the step of providing the non-combustible coating material on the surface of a foamed resin heat insulating material.

  The foamed resin material provided with the incombustible coating material of the present invention on the surface had little deterioration in heat insulation even when exposed to high temperatures. That is, the foamed resin was not easily damaged by heat. This means that even when exposed to high temperatures, there is little decrease in the heat insulating property of the foamed resin material. And the foamed resin-type heat insulating material was hard to burn. In particular, a foamed resin material having excellent heat insulation, flame retardancy, and durability was obtained.

Schematic plan view and cross-sectional view of the specimen during the electric furnace heating test

  The first invention is an incombustible coating material. In particular, it is an incombustible coating material for foamed resin-based heat insulating materials. The incombustible coating material has rock wool. The incombustible coating material has cement. The incombustible coating material has aluminum hydrates. The total amount of the cement and the aluminum hydrate is preferably 50 to 300 parts by mass with respect to 100 parts by mass of rock wool. Especially preferably, it is 70 mass parts or more. Particularly preferably, it is 260 parts by mass or less. More preferably, it is 100 parts by mass or more. More preferably, it is 200 mass parts or less. The amount of the aluminum hydrate is preferably 30 to 90 parts by mass with respect to 100 parts by mass of the total amount of the cement and the aluminum hydrate. Especially preferably, it is 40 mass parts or more. Particularly preferably, it is 85 parts by mass or less. More preferably, it is 50 mass parts or more. More preferably, it is 80 parts by mass or less. The aluminum hydrates preferably have an average particle size of 1 to 120 μm. Particularly preferably, it is 3 μm or more. Particularly preferably, it is 100 μm or less. More preferably, it is 10 μm or more. More preferably, it is 60 μm or less. The aluminum hydrate is particularly preferably aluminum hydroxide. In addition, the average particle diameter of aluminum hydrates is a volume average diameter.

  The second invention is a nonflammable heat insulating material. The non-combustible heat insulating material has a foamed resin heat insulating material. The incombustible heat insulating material has the incombustible coating material provided on the surface of the foamed resin heat insulating material. The incombustible heat insulating material preferably has an adhesive provided between the foamed resin heat insulating material and the incombustible coating material.

  3rd invention is the construction method of a nonflammable heat insulating material. The construction method includes a step of providing a foamed resin heat insulating material on the surface of the structure. The construction method includes a step of providing the incombustible coating material on the surface of the foamed resin-based heat insulating material.

  This will be described in more detail below.

In the present invention, rock wool is a material (mineral fiber) that is made into a fiber while quenching a material mainly composed of rocks, blast furnace slag and the like melted in a melting furnace. For example, slag wool manufactured from a material mainly composed of blast furnace slag is also included. The rock wool is a raw cotton obtained by collecting fiberized mineral fibers or a granular rock wool obtained by thinning the raw cotton with a defatting machine or the like (referred to as “non-molded product rock wool” in the present specification together with the raw cotton). )) And a molded product formed by adding a small amount of thermosetting resin such as phenol resin to the board or mat shape, and the rock wool is preferably a non-molded product. Rock wool, for example, granular rock wool (mainly granular rock wool). Non-molded rock wool does not burn because it does not contain resin. In order to make the raw cotton finer with an anti-tapping machine, etc., the process of unwinding with an anti-tapping machine, pulverization with a pulverizer, cutting with a cutting device, classification with a classifier such as a sieve, granulation with a granulator, etc. Two or more types can be combined. As the non-molded rock wool to be used, the density measured according to the method for measuring the density of wool specified in JIS A 9504: 1999 “Artificial mineral fiber heat insulating material” 6.4.1 is 80 to 300 kg / m ³ . It is preferable because it has good miscibility with cement and aluminum hydrates and is difficult to transfer heat to the foamed resin-based heat insulating material when used as a non-combustible coating material. The granular rock wool is obtained by one or a combination of two or more processes such as pulverization, defatting, cutting, classification (for example, sieving), granulation, and the like. When such rock wool is used, it is difficult for heat to be transferred to the foamed resin heat insulating material.

  In the present invention, the cement is, for example, a hydraulic cement. Specifically, for example, Portland cement (various Portland cements that are normal, early strength, very early strength, low heat, and moderate heat) can be used. Examples include eco-cement. Furthermore, various mixed cements in which, for example, fly ash, blast furnace slag, silica fume, limestone fine powder, or the like is mixed with the cement are also included. Alumina cement is also included. A super fast cement is also included. The super-hard cement is, for example, super jet cement (trade name: manufactured by Taiheiyo Cement) or jet cement (trade name: manufactured by Sumitomo Osaka Cement Co.). A preferred cement is, for example, Portland cement. Or it is ecocement. Or it is the cement (mixed cement) which has a calcium silicate mineral as a main component. A particularly preferred cement is Portland cement. The cement containing calcium silicate mineral as a main component contains 50 mass% or more of calcium silicate mineral (C3S, C2S) in the cement clinker pulverized product. More preferably, it contains 60% by mass or more. More preferably, it contains 70% by mass or more.

In the present invention, aluminum hydrates (aluminum compound hydrates) have an aluminum element (or aluminum ions) coordinated by water molecules (or hydroxide ions) and are dehydrated (heat dehydrated). It refers to a substance that produces Al ₂ O ₃ . As long as the effect of the present invention is not substantially inhibited, Fe ₂ O ₃ , SiO ₂ , TiO ₂ , K ₂ O, Na ₂ O, SO ₃ , MgO, MnO, Li ₂ O, P ₂ O ₅ , F, Impurities such as CO ₃ ²⁻ may be contained. The content of impurities in the aluminum hydrates is preferable because, for example, 30% by mass or less is highly effective in suppressing the temperature rise of the foamed resin heat insulating material when the same amount is added. Examples of aluminum hydrates include aluminum hydroxide, gibbsite, boehmite, diaspore, bauxite and the like. Among these, aluminum hydroxide was a particularly preferable aluminum hydrate because it had a high temperature rise suppressing effect in the foamed resin heat insulating material. Large aluminum hydrates having an average particle size exceeding 120 μm had a small effect of suppressing the temperature rise of the foamed resin heat insulating material. Accordingly, aluminum hydrates having an average particle size of 120 μm or less were preferred. Further, the size was 100 μm or less. In particular, the size was 60 μm or less. Conversely, aluminum hydrates having an average particle diameter of less than 1 μm may generate a lot of dust when the surface of the foamed resin-based heat insulating material is coated with the non-combustible coating material of the present invention by the spraying method. It was. Accordingly, aluminum hydrates having an average particle size of 1 μm or more were preferable. Furthermore, the average particle size was 3 μm or more. Particularly, it was 10 μm or more. Aluminum hydrates having a specific surface area of 0.05 m ² / cm ³ or more were highly effective in suppressing the temperature rise of the foamed resin-based heat insulating material. Therefore, aluminum hydrates having a specific surface area of 0.05 m ² / cm ³ or more were preferred. Furthermore, the specific surface area was 0.1 m ² / cm ³ or more. From the viewpoint of the amount of dust generated when used in the spraying method, aluminum hydrates having a specific surface area of 2 m ² / cm ³ or less were preferred. The average particle diameter and specific surface area are values (volume-specific specific surface area) obtained by a laser diffraction scattering method using a measuring instrument (Microtrac (trade name)).

  In the present invention, the total amount of aluminum hydrates and cement is preferably 50 to 300 parts by mass with respect to 100 parts by mass of rock wool. When the total of aluminum hydrates and cement was less than 50 parts by mass, the temperature rise suppressing effect of the foamed resin-based heat insulating material tended to be low. On the other hand, when it exceeds 300 parts by mass, it tends to fall or slide down when thickly applied to a foamed resin heat insulating material such as a ceiling part or a wall part at once. For these reasons, the above ratio was preferred. More preferably, the total amount of aluminum hydrates and cement was 100 to 200 parts by mass with respect to 100 parts by mass of rock wool.

  It was preferable that the aluminum hydrates were 30 to 90 parts by mass with respect to 100 parts by mass of the total amount of aluminum hydrates and cement. 70 to 10 parts by mass of cement was preferable with respect to 100 parts by mass of the total amount of aluminum hydrates and cement. When the total amount of aluminum hydrates and cement is 100 parts by mass, the amount of aluminum hydrates is less than 30 parts by mass, that is, the cement exceeds 70 parts by mass. It was low. That is, the foamed resin heat insulating material was easily damaged. When the total amount of aluminum hydrates and cement is 100 parts by mass, the amount of aluminum hydrates exceeds 90 parts by mass, that is, if the cement is less than 10 parts by mass, the cement contained in the incombustible coating material The amount was insufficient and the incombustible coating material was difficult to cure. Since the temperature rise suppression effect of the foamed resin-based heat insulating material is high and the foamed resin-based heat insulating material was not easily damaged, the aluminum hydrates were used for 100 parts by mass of the total amount of aluminum hydrates and cement. It was preferable that 40-90 mass parts and cement were 60-10 mass parts.

  In addition to rock wool, aluminum hydrates, and cement, one or more materials selected from various admixtures and aggregates can be used in combination for the incombustible coating material of the present invention. Examples of admixtures include cement polymers, expansive materials, gypsum, cement dispersants (water reducing agents, AE water reducing agents, high performance AE water reducing agents, high performance water reducing agents, fluidizing agents, etc.), waterproof materials, rust preventive agents, Shrinkage reducing agent, thickener, water retention agent, pigment, fiber, water repellent agent, anti-whitening agent, quick setting agent (material), quick hardening agent (material), setting retarder, antifoaming agent, foaming agent, blast furnace Slag fine powder, stone powder, silica fume, volcanic ash, air entraining agent, surface hardening agent and the like can be mentioned. Examples of the aggregate include river sand, land sand, sea sand, crushed sand, quartz sand, river gravel, land gravel, crushed stone, artificial aggregate such as perlite and foamed glass particles (glass balloon), slag aggregate, and the like.

  The incombustible coating material of the present invention is used in combination with water. The amount of water was preferably 50 to 300 parts by mass with respect to 100 parts by mass of the total amount of rock wool, cement and aluminum hydrates. If the amount is less than 50 parts by mass, the viscosity of the incombustible coating material becomes high, so that it is difficult to mix the materials. On the other hand, when the amount exceeds 300 parts by mass, the adhesion at the interface between the foamed resin heat insulating material and the non-combustible coating material tends to be poor.

  The method and apparatus for producing the incombustible coating material of the present invention are not particularly limited. For example, gravity mixers such as V type mixers and tiltable concrete mixers, Henschel mixers, ribbon mixers, pan type concrete mixers, pug mill type concrete mixers, gravity concrete mixers, grout mixers, hand mixers, plastering mixers, etc. It can be manufactured by putting the above materials into a mixer and mixing them. It can also be produced by pumping rock wool, cement, and aluminum hydrate through separate transport pipes in a separate route, and merging and mixing in a Y-shaped pipe or the like during the pumping. It can also be produced by adding cement and aluminum hydrates to rock wool being transported by a transporting device such as a pressure feed tube or a belt conveyor, and then feeding by pressure. A part of rock wool, cement, and aluminum hydrates may be mixed in advance by a mixer or the like. As with rock wool, cement and aluminum hydrates, materials other than rock wool, cement and aluminum hydrates may be added in the transport route of the material. You may mix with hydrates or some of these.

  The nonflammable heat insulating material of the present invention is characterized in that the above-mentioned nonflammable coating material combined with water is coated on the surface of a foamed resin heat insulating material. That is, the surface of the foamed resin heat insulating material is covered with a nonflammable coating material containing rock wool, aluminum hydrates, cement, and water. When an incombustible coating material is coated on the surface of the foamed resin insulation, a primer (for example, an adhesive) is applied to increase the adhesion strength between the foamed resin insulation and the incombustible coating material. It is very preferable that a primer layer (adhesive layer) is provided between the heat insulating material layer and the noncombustible coating material layer. Examples of the adhesive include synthetic rubber such as styrene / butadiene copolymer, chloroprene rubber, acrylonitrile / butadiene copolymer or methyl methacrylate / butadiene copolymer, natural rubber, polyolefin such as polyethylene and polypropylene, polychloropyrene, and polyacrylic. Acid ester, styrene / acrylic copolymer, all acrylic copolymer, polyvinyl acetate, vinyl acetate / acrylic copolymer, vinyl acetate / acrylic ester copolymer, modified vinyl acetate, ethylene / vinyl acetate copolymer, Vinyl acetate-based resins such as ethylene / vinyl acetate / vinyl chloride copolymer, vinyl acetate vinyl versatate copolymer, acrylic / vinyl acetate / veova (trade name of vinyl t-decanoate) copolymer, unsaturated polyester resin , Polyurethane resin, alkyd Synthetic resins such as butter and epoxy resins, bituminous, such as asphalt and rubber asphalt, and the like. These 1 type (s) or 2 or more types can be used.

  An example of the construction method of the nonflammable heat insulating material of the present invention is given below. A foamed resin-based heat insulating material is disposed on the surface of the structure, and the surface of the foamed resin-based heat insulating material is then covered with the above-described non-combustible coating material. Of course, it is not limited to this. The method for coating the surface of the foamed resin heat insulating material with the non-combustible coating material is not particularly limited. For example, using a brush, roller, spraying device, etc., a method of applying a non-combustible coating material to the surface of the foamed resin heat insulating material, and a formwork installed so that there is a space between the surface of the foamed resin heat insulating material In the method of filling the voids with a non-combustible coating material, the non-combustible coating material is formed into a plate, block or sheet, and the plate, block or sheet of non-combustible coating material is foamed resin-based heat insulation The method of sticking on the material surface is mentioned. Applying the primer (adhesive) to the surface of the foamed resin-based heat insulating material before coating the surface of the foamed resin-based heat insulating material with the non-combustible coating material results in adhesion between the foamed resin-based heat insulating material and the non-combustible coating material. This is preferable because it increases power. The method for disposing the foamed resin heat insulating material on the structure surface is not particularly limited. For example, a method of applying a foamed resin heat insulating material to the structure surface using a brush, roller, spraying device, etc., a method of bonding a foamed resin heat insulating material to the structure surface using an adhesive, A method of attaching foamed resin-based insulation using screws, bolts, nuts, nails or appropriate attachments, and a sheet, plate or block coated or bonded with foamed resin-based insulation on the surface of the structure using an adhesive A method of attaching, a sheet, plate or block coated or bonded with foamed resin insulation to the surface of the structure using screws, bolts, nuts, nails or appropriate fittings, or applying or bonding foamed resin insulation For example, a method of fitting the sheet, plate, or block into the structure or its gap so as to cover the surface of the structure. Of course, it is not limited to these. Two or more methods may be used in combination.

  Hereinafter, description will be made with specific examples. However, the present invention is not limited to the following specific examples. Various modifications and application examples are included as long as the features of the present invention are not greatly impaired.

[Example 1]
Hard urethane was sprayed on one plane of a flexible board (910 × 910 × 5 mm) to form a foamed resin heat insulating material layer made of hard urethane foam having a thickness of 20 mm. After curing for one week indoors, the rigid urethane foam was cut into 70 × 70 × 20 mm (length × width × thickness).

Granular rock wool (rock wool granular cotton (manufactured by Taiheiyo Material Co., Ltd.), density of wool as defined in 6.4.1 of JIS A 9504: 1999: 110 kg / m ³ , obtained by classifying rock wool raw cotton with a sieve), Using aluminum hydrates (aluminum hydroxide (manufactured by Nippon Light Metal Co., Ltd.), impurities less than 1% by mass), cement (ordinary Portland cement (manufactured by Taiheiyo Cement Co., Ltd.)), and water (city water in Sakura City, Chiba Prefecture) Coating materials (Nos. 1 to 6) shown in Table 1 below were produced.

注１：表中「粉体」は「アルミニウム水和物類とセメントとの合計」を意味する。
注２：マイクロトラック（商品名）による測定値。
表−１における「見掛け密度」は、以下の＜見掛け密度の測定＞に従って測定したコーティング材の見掛け密度（単位容積質量）である。
＜見掛け密度の測定＞
硬質ウレタン製容器（内側形状；７０×７０×２０ｍｍ（縦×横×高さ）の直方体）にコーティング材を充填し、２０℃，湿度６０％の恒温室内で１日養生後に、コーティング材を硬質ウレタン製容器から取り出し、ノギスによりコーティング材の縦（Ｘａ）、横（Ｘｂ）、高さ（Ｘｃ）を測定した。次式（１）により、コーティング材の体積（Ｖ）を求めた。
Ｖ（ｃｍ^３）＝Ｘａ（ｃｍ）×Ｘｂ（ｃｍ）×Ｘｃ（ｃｍ） 式(１)
次に、コーティング材を１０５℃の乾燥機を用いて質量が恒量となるまで乾燥させ、その時質量（ｗ）を用い、次式（２）により、コーティング材の見掛け密度（ρ）を求めた。
ρ（ｇ／ｃｍ^３）＝ｗ（ｇ）÷Ｖ（ｃｍ^３） 式（２） Table-1

Note 1: “Powder” in the table means “total of aluminum hydrates and cement”.
Note 2: Measured value by Microtrack (trade name).
The “apparent density” in Table-1 is the apparent density (unit volume mass) of the coating material measured according to the following <Measurement of Apparent Density>.
<Measurement of apparent density>
A hard urethane container (inner shape: rectangular parallelepiped of 70 x 70 x 20 mm (length x width x height)) is filled with a coating material and cured for one day in a temperature-controlled room at 20 ° C and 60% humidity. It took out from the container made from urethane, and measured the vertical (Xa), horizontal (Xb), and height (Xc) of the coating material with calipers. The volume (V) of the coating material was determined by the following formula (1).
V (cm ³ ) = Xa (cm) × Xb (cm) × Xc (cm) Formula (1)
Next, the coating material was dried using a dryer at 105 ° C. until the mass became a constant weight, and the apparent density (ρ) of the coating material was obtained by the following equation (2) using the mass (w).
ρ (g / cm ³ ) = w (g) ÷ V (cm ³ ) Formula (2)

  The coating material of the said Table-1 was apply | coated to the surface of the hard urethane foam with the mortar knife so that it might become thickness 20mm. Thereby, the test body (No. 1-6) by which the nonflammable coating material was provided in the hard urethane foam surface (70x70 mm) was produced. Before the coating material is applied, 0.25 g of a primer ("Pacific Spray Bond" (trade name, acrylic copolymer emulsion, solid content 60% by mass)) made by Taiheiyo Material Co., Ltd. is applied to the surface of the foamed resin-based heat insulating material. It was.

A quality test (electric furnace heating test, exothermic test) of the specimen was performed.
<Electric furnace heating test>
The surface of the test body (Nos. 1 to 6) was covered with the ceramic fiber heat insulating material 3 and the ceramic board heat insulating material 4. A part of the surface of the coating material 2 of the test body is exposed (see FIG. 1). The exposed part of the surface of the coating material 2 is a square of 60 × 60 mm. This was placed in a box electric furnace. The heating conditions reached 729 ° C. in 5 minutes from the start of heating, maintained at 729 ° C. for 15 minutes, then stopped heating and naturally cooled in the electric furnace. A thermocouple was installed in the test body, and the temperature at the interface between the foamed resin-based heat insulating material 1 and the coating material 2 (foamed resin-based heat insulating material surface temperature: tw) and the temperature (tm) at the surface of the coating material 2 were measured.

The test results are shown in Table-2.
Table-2

The evaluation criteria for this test are as follows.
[Evaluation criteria 1 (evaluation of nonflammability)]
The test piece whose maximum temperature (maximum value of tw) on the surface of the foamed resin-based heat insulating material did not reach 410 ° C., which is the ignition point of the foamed resin-based heat insulating material, was “◎”, and it took 30 minutes or more to reach 410 ° C. The test specimen was judged as “◯”, and the specimen that reached 410 ° C. in less than 30 minutes was judged as “x”.

[Evaluation Criteria 2 (Flame Retardancy Evaluation)]
At 20 minutes after the start of heating (at the end of heating), the test body whose surface temperature of the foamed resin-based heat insulating material was less than 100 ° C. was “◎”, and the test body whose temperature was 100 ° C. or more and less than 250 ° C. was “◯”. The test body that was 250 ° C. or higher was judged as “x”. In establishing this evaluation standard, the following tests were conducted.

  The foamed resin-based heat insulating material cut out to be 40 × 40 × 10 mm (length × width × thickness) is kept at a constant temperature for 10 minutes in increments of 10 ° C. within the range of 150 to 270 ° C. using an electric furnace. Heated. As a result of visually observing the foamed resin-based heat insulating material after heating at each temperature, none of the foamed resin-based heat insulating material heated at a heating temperature of 150 to 240 ° C. was discolored black and contracted. On the other hand, all of the foamed resin-based heat insulating material heated at 250 ° C. or more turned black and contracted. In particular, the foamed resin-based heat insulating material heated at a heating temperature of 180 ° C. or less hardly changed color and did not shrink. The discoloration caused by heating was thought to be due to scorching. In addition, all the foamed resin-type heat insulating materials heated at the heating temperature of 190-240 degreeC were discolored from yellow to brown.

  As for the test body (No. 1-5) using the incombustible coating material (No. 1-5) of this invention, as for all, the maximum temperature (maximum value of tw) of a foamed resin-type heat insulating material surface is a foamed resin type. It took 30 minutes or more to reach 410 ° C., the ignition point of the heat insulating material. That is, it turns out that it is flame-retardant. In particular, no. The specimens (Nos. 1 to 3) using the coating materials 1 to 3 did not reach 410 ° C., which is the ignition point of the foamed resin heat insulating material, and were particularly excellent in terms of nonflammability.

[Example 2]
Test specimens (Nos. 7 to 9) were produced in the same manner as in Example 1. This test body is a flexible board (100 × 100 × 5 mm) on which a foamed resin-based heat insulating material made of rigid urethane foam having a thickness of 20 mm and a coating material (No. 1 to 3) having a thickness of 20 mm are laminated, and thereafter for one month. It was cured indoors.

  An exothermic test of JIS A 5430 was conducted. The total calorific value for 20 minutes after the start of heating was determined. After heating for 20 minutes, the amount of reduction in the thickness of the foamed resin-based heat insulating material made of rigid urethane foam after the start of heating was determined.

The results are shown in Table-3.
Table-3

[Evaluation criteria 3 (evaluation of nonflammability)]
When the total calorific value for 20 minutes after the start of heating is 8.0 MJ / m ² or less and the amount of decrease in the thickness of the foamed resin-based heat insulating material due to heating for 20 minutes is 10 mm or less, it is determined that the nonflammability is good. The others were judged as bad.

DESCRIPTION OF SYMBOLS 1 Foamed resin type heat insulating material 2 Nonflammable coating material 3 Ceramic fiber type heat insulating material 4 Ceramic board type heat insulating material

Claims (6)

It is a non-combustible coating material for foamed resin insulation,
With rock wool,
Cement,
Aluminum hydrates,
The total amount of the cement and the aluminum hydrate is 50 to 300 parts by mass with respect to 100 parts by mass of the rock wool.
The incombustible coating material , wherein the amount of the aluminum hydrate is 30 to 90 parts by mass with respect to 100 parts by mass of the total amount of the cement and the aluminum hydrate. . The incombustible coating material according to claim 1, wherein the aluminum hydrate has an average particle size of 1 to 120 µm. The incombustible coating material according to claim 1 or 2, wherein the aluminum hydrate is aluminum hydroxide. A foamed resin insulation,
A nonflammable heat insulating material comprising the nonflammable coating material according to any one of claims 1 to 3 provided on a surface of the foamed resin heat insulating material. The incombustible heat insulating material according to claim 4, wherein an adhesive is provided between the foamed resin heat insulating material and the incombustible coating material. Providing a foamed resin-based heat insulating material on the surface of the structure;
And a step of providing the incombustible coating material according to any one of claims 1 to 3 on a surface of the foamed resin-based heat insulating material.

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