JP2014141868A - Incombustible spray material for foamed resin-based heat insulator, and incombustible heat insulation structure and construction method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an incombustible spray material for a foamed resin-based heat insulator, which imparts an incombustible property when coated on a surface of the foamed resin-based heat insulator, and suppressing performance against deterioration of a heat insulation property even if exposed under a fire, namely, which reduces a total heat generation amount in a heat generation property test specified in the JIS A 5430 and reduces a decrease amount of a thickness of the foamed resin-based heat insulator after the test, to provide an incombustible heat insulation structure having an incombustible property and reducing deterioration of heat insulation even if exposed under a fire, and to provide a construction method of the incombustible heat insulation structure.SOLUTION: Rock wool, cement and water are made confluent by a specific method. Namely, rock wool containing cement and cement slurry are made confluent by a spray device.

Description

  The present invention relates to a sprayed incombustible material for a foamed resin-based heat insulating material. More specifically, the present invention relates to a sprayed non-combustible material for a foamed resin-based heat insulating material that has non-flammability when coated on the surface of the foamed resin-based heat insulating material and has little decrease in heat insulating properties even when exposed to a flame. The present invention also relates to a nonflammable heat insulating structure. More specifically, the present invention relates to a nonflammable heat insulating structure using a foamed resin heat insulating material that has nonflammability and has little deterioration in heat insulating properties even when exposed to a flame. Moreover, this invention relates to the construction method of a nonflammable heat insulation structure. Specifically, the present invention relates to a method for constructing a nonflammable heat insulating structure using a foamed resin heat insulating material that has nonflammability and has little deterioration in heat insulating properties even when exposed to a flame.

  A building structure or a civil engineering structure is constructed of materials such as steel, concrete, mortar, stone, brick, wood, tile, plaster, glass, and earth. However, since the structure constructed only with these materials has high thermal conductivity and heat easily escapes, the efficiency of air conditioning is poor. For this reason, a heat insulating material is used. As this heat insulating material, foamed resin heat insulating materials such as beaded polystyrene foam, extruded polystyrene foam, and rigid urethane foam are widely used. However, many of these are flammable, and fires have occurred due to the flammability of foamed resin-based heat insulating materials, both domestically and overseas.

  By the way, there is a fireproof mortar in which cement, lightweight aggregate, admixture and water are kneaded (for example, see Patent Document 1). However, refractory coated mortar is harder than foamed resin-based heat insulating materials, or the behavior of length change due to heat, drying, etc. is different. There is a possibility that peeling occurs at the interface with the heat insulating material. In addition, spray rock wool made of rock wool, cement and water has fire resistance and is widely used as a fireproof coating material for steel and the like.

Japanese Patent No. 3240308

  The inventors of the present application have examined whether a spray rock wool made of rock wool, cement, and water can be applied as a spray incombustible material for a foamed resin heat insulating material. As a result of the examination, the total calorific value in the exothermic test specified in JIS A 5430 (hereinafter sometimes simply referred to as “test”) is a small value, and the thickness of the foamed resin-based heat insulating material is greatly reduced by the test. have done. If the thickness of the heat insulating material is greatly reduced, the heat insulating property is greatly reduced. Therefore, it is necessary to repair the heat insulating material in order to maintain the heat insulating property. Therefore, there is a demand for a sprayed non-combustible material for a foamed resin-based heat insulating material that has a small decrease in heat insulating properties even when exposed to a flame, that is, a small decrease in the thickness of the foamed resin-based heat insulating material.

  The present invention is non-flammable when coated on the surface of a foamed resin-based heat insulating material and has little deterioration in heat insulating properties even when exposed to a flame. That is, the total heat generation in a heat generation test defined in JIS A 5430 It aims at providing the incombustible material for foaming resin type heat insulating materials for which the quantity is small and the reduction amount of the thickness of the foamed resin type heat insulating material after a test is small.

  Further, the present invention is nonflammable and has little deterioration in heat insulation even when exposed to a flame, that is, the total heat generation in the exothermic test defined in JIS A 5430 is small, and foaming after the test is performed. It aims at providing the nonflammable heat insulation structure with the small reduction amount of the thickness of a resin-type heat insulating material.

  Further, the present invention is nonflammable and has little deterioration in heat insulation even when exposed to a flame, that is, the total heat generation in the exothermic test defined in JIS A 5430 is small, and foaming after the test is performed. It aims at providing the construction method of the nonflammable heat insulation structure from which the nonflammable heat insulation structure with a small reduction amount of the thickness of a resin-type heat insulating material is obtained.

As a result of intensive studies for solving the above problems, the present inventors have found that the above problems can be solved by joining rock wool, cement and water in a specific method, and have completed the present invention. That is, the present invention is a non-flammable material for a foamed resin-based heat insulating material represented by the following (1) to (3), a nonflammable heat insulating structure represented by (4), and a non-flammable material represented by (5) or (6) It is a construction method of a heat insulating structure.
(1) (A) A cement-containing rock wool containing rock wool and cement as main components, and (B) a cement slurry containing water and cement as main components are joined together by a spraying device. Non-flammable material for foamed resin insulation.
(2) The incombustible material for foamed resin-based heat insulating material according to (1), wherein the cement slurry is 50 to 200 parts by mass with respect to 100 parts by mass of the cement-containing rock wool.
(3) The light weight bulk density of the cement-containing rock wool is 0.06 to 0.70 g / cm ³ , and the cement is 45 to 85 parts by mass with respect to a total of 100 parts by mass of cement and rock wool contained. The incombustible material for spraying according to the above (1) or (2), wherein the rock wool is 15 parts by mass to 55 parts by mass.
(4) A nonflammable heat insulating structure, wherein the surface of a foamed resin heat insulating material is coated with any of the above-mentioned sprayed nonflammable materials (1) to (3).
(5) A foamed resin-based heat insulating material is disposed on the surface of the structure, and then the surface of the foamed resin-based heat insulating material is coated with any one of the above-mentioned (1) to (3) spraying incombustible materials by a spraying method. The construction method of the nonflammable heat insulation structure characterized by this.
(6) One or two or more emulsions selected from synthetic resins and bitumen, or one or more selected from cement, cement slurry, and mortar were mixed on the surface of the foamed resin heat insulating material. The method for constructing a nonflammable heat insulating structure according to (5), wherein a primer made of cement paste or mortar is applied and then the sprayed nonflammable material is coated.

  According to the present invention, when the surface of the foamed resin-based heat insulating material is coated, it has nonflammability, and even when exposed to a flame, there is little decrease in heat insulating properties, that is, in the exothermic test specified in JIS A 5430. A sprayable non-combustible material for a foamed resin-based heat insulating material having a small total heat generation and a small decrease in the thickness of the foamed resin-based heat insulating material after the test can be obtained. In addition, according to the present invention, it has nonflammability, and there is little deterioration in heat insulation even when exposed to a flame. That is, the total calorific value in the exothermic test specified in JIS A 5430 is small, and after the test. Thus, a nonflammable heat insulating structure with a small reduction in thickness of the foamed resin heat insulating material can be obtained. In addition, according to the present invention, it has nonflammability, and there is little deterioration in heat insulation even when exposed to a flame. That is, the total calorific value in the exothermic test specified in JIS A 5430 is small, and after the test. The construction method of the nonflammable heat insulation structure in which the nonflammable heat insulation structure with the small amount of reduction | decrease of the thickness of the foamed resin-type heat insulating material is obtained is obtained. According to the present invention, a structure that is excellent in heat insulation and incombustible can be obtained. Moreover, even if exposed to a flame, repair of a heat insulating material is unnecessary.

  The incombustible material for foamed resin-based heat insulating material of the present invention comprises (A) a cement-containing rock wool containing rock wool and cement as main components, and (B) a cement slurry containing water and cement as main components. It is characterized by merging with a spraying device.

The cement-containing rock wool (component A) used in the present invention is a mixture of granular or powdered rock wool and cement. It is preferable that the rock wool to be used is mainly composed of granular rock wool because it is difficult to transfer heat to the foamed resin heat insulating material. In order to make rock wool granular, rock wool can be produced by one or a combination of two or more processes such as pulverization, cotton breaking, cutting, sieving classification, granulation, and the like.
The cement used in the present invention may be a hydraulic cement. For example, various ordinary Portland cements, eco-cements, low-temperature and moderately-heated portland cements, eco-cements, and portland cements or eco-cements, such as fly Various cements mixed with ash, blast furnace slag, silica fume, limestone fine powder, etc., super-hard cement such as “Super Jet Cement” (trade name) manufactured by Taiheiyo Cement Co., Ltd. and “Jet Cement” (trade name) manufactured by Sumitomo Osaka Cement Co., Ltd. , Alumina cement, and the like, and one or more of these can be used. The cement used in the present invention is preferably a cement mainly composed of calcium silicate mineral such as Portland cement, eco-cement or mixed cement, and more preferably Portland cement. Here, the main component of calcium silicate mineral is to contain 50% by mass or more, preferably 60% by mass or more of calcium silicate mineral (C ₃ S, C ₂ S) in the pulverized cement clinker. More preferably 70% by mass or more.

  In addition to rock wool and cement, the cement-containing rock wool used in the present invention can be used in combination with one or more selected from admixtures, aggregates, and water within a range that does not substantially impair the effects of the present invention. . Examples of the admixture include a polymer for cement, an expansion material, gypsum, a cement dispersant (including a water reducing agent, an AE water reducing agent, a high performance AE water reducing agent, a high performance water reducing agent, and a fluidizing agent), a waterproof material, and an anti-proofing material. Rust agent, shrinkage reducing agent, thickener, water retention agent, pigment, fiber, water repellent, whitening prevention 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 hardener and the like. Examples of aggregates include river sand, land sand, sea sand, crushed sand, quartz sand, river gravel, land gravel, crushed stone, artificial aggregates such as perlite and foamed glass particles (glass balloons), and slag aggregate. It is done.

  There are no particular limitations on the method and apparatus for producing cement-containing rock wool by mixing rock wool and cement or, if necessary, further added materials. 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. Moreover, it can also manufacture by pumping rock wool and cement by another path | route through a separate transport pipe, and merging and mixing with a Y-shaped pipe etc. in the middle of pumping. Moreover, it can also manufacture by pumping, after adding to rock wool currently transporting with transport apparatuses, such as a pressure feed pipe and a belt conveyor, so that cement may be applied. Materials other than rock wool and cement may be added in the material transportation route in the same manner as rock wool or cement, or may be mixed with rock wool and / or cement in advance.

  The mixing ratio of cement and rock wool in cement-containing rock wool (component A) may be 20 to 60 parts by mass of cement and 40 to 80 parts by mass of rock wool with respect to a total of 100 parts by mass of cement and rock wool. preferable. When the amount of cement is less than 20 parts by mass, that is, the amount of rock wool is more than 80 parts by mass, the amount of decrease in the thickness of the foamed resin-based heat insulating material after the test is large, or adhesion at the interface between the foamed resin-based heat insulating material and the sprayed incombustible material. bad. Moreover, when there is more cement than 60 mass parts, that is, when there is less rock wool than 40 mass parts, there will be much dust generation amount at the time of spray construction.

The light bulk density in the cement-containing rock wool (component A) is preferably 0.06 to 0.70 g / cm ³ . When the light bulk density is less than 0.05 g / cm ³ , the amount of decrease in the thickness of the foamed resin-based heat insulating material after the test is large. On the other hand, when the light bulk density exceeds 0.70 g / cm ³ , the heat insulating effect of the sprayed incombustible material is reduced, and heat is easily transmitted to the foamed resin heat insulating material. The light bulk density in the present invention is such that the sample (cement-containing rock wool) is gently filled until it overflows into a steel container whose internal volume (Vx) is known, and the sample overflowing from the upper surface of the container is filled. The value (Mr) calculated by the following equation (1) from the mass (Wr) of the sample (cement-containing rock wool) in the steel container after being removed by scraping with a ruler.
Mr = Wr / Vx (1)

  Next, the cement slurry (component B) containing water and cement as main components is a mixture of water and cement. Furthermore, 1 type, or 2 or more types chosen from another admixture or an aggregate can be used together in the range which does not impair the effect of this invention substantially. As this admixture, those which can be added to the above-mentioned component A can be used. Examples of aggregates include river sand, land sand, sea sand, crushed sand, quartz sand, artificial fine aggregates such as perlite and foamed glass particles (glass balloons), slag fine aggregates, and the like. Is preferable because it is difficult to separate the material, that is, it is difficult to settle in the cement slurry (component B). Moreover, the cement used for cement slurry (B component) can use 1 type, or 2 or more types of said hydraulic cement which can be used for cement containing rock wool (A component).

  The blending ratio of cement and water in the cement slurry (component B) is preferably 50 to 300% in terms of water cement ratio. When it is less than 50%, the viscosity of the cement slurry is high and it is difficult to mix with the component A. If it exceeds 300%, adhesion at the interface between the foamed resin heat insulating material and the sprayed incombustible material is poor. In the cement slurry (component B), a more preferable blending ratio of water is 100 to 250% in terms of water cement ratio.

  The spraying device for joining cement-containing rock wool (component A) and cement slurry (component B) should be a spraying device used for spraying rock wool, spraying mortar, spraying concrete, spraying coating, etc. Can do. That is, the incombustible material for foamed resin-based heat insulating material according to the present invention comprises cement rock wool (component A) and cement slurry (component B), spray rock wool, spray mortar, spray concrete or spray concrete. It is a spraying incombustible material formed by spraying by joining with a spraying device used for painting or the like or other spraying devices. The merging of cement-containing rock wool (component A) and cement slurry (component B) is a method of adding component B in the pumping route of component A, a method of adding component A in the pumping route of component B, and a spraying device. A method in which the A component and the B component are separately fed to the mixing device that forms a part of the air and mixed by the mixing device, and then discharged from the discharge port, and the A component is discharged from the nozzle that forms a part of the spraying device. A method of mixing by spraying the B component is a suitable example. At this time, the number of spray nozzles for discharging the B component and atomizing it in the form of mist may be one or plural. In the case where there is one B component spray nozzle, the B component spray nozzle may be arranged in the center of the A component discharge port, located within 30 cm from the A component discharge port, You may arrange | position the B component spray nozzle in the position which can make the B component atomized aiming at the A component discharged. Further, when there are a plurality of B component spray nozzles, each B for surrounding the A component discharge port at a position where the B component atomized from the A component discharged from the discharge port can be joined. The component spray nozzle is preferably disposed, and a part of the component B spray nozzle may be disposed at the center of the A component discharge port.

  The cement slurry (component B) is preferably 50 to 200 parts by mass with respect to 100 parts by mass of cement-containing rock wool (component A). If the B component is less than 50 parts by mass, the amount of decrease in the thickness of the foamed resin-based heat insulating material after the test is large. If it exceeds 200 parts by mass, adhesion at the interface between the foamed resin heat insulating material and the sprayed incombustible material is poor. Since the amount of decrease in the thickness of the foamed resin-based heat insulating material after the test is smaller and adhesion at the interface between the foamed resin-based heat insulating material and the sprayed incombustible material is good, the B component is 60 to 150 masses per 100 mass parts of the A component. Part. More preferably, it is 95-145 mass parts.

  The proportion of cement and rock wool in the incombustible material after joining the A component and the B component is 45 parts by weight to 85 parts by weight of cement and 15 parts of rock wool for a total of 100 parts by weight of cement and rock wool. It is preferable that the amount is from 55 to 55 parts by mass because the amount of decrease in the thickness of the foamed resin heat insulating material after the exothermic test is small and the adhesion strength at the interface between the foamed resin heat insulating material and the sprayed incombustible material is high. When the amount of cement is less than 45 parts by mass, that is, when the amount of rock wool is more than 55 parts by mass, the amount of decrease in the thickness of the foamed resin-based heat insulating material after the exothermic test is large or at the interface between the foamed resin-based heat insulating material and the sprayed incombustible material. Adhesion may be bad. Further, when the cement is more than 85 parts by mass, that is, when the rock wool is less than 15 parts by mass, the deformation followability to the foamed resin-based heat insulating material is poor, and the foamed resin-based heat insulating material and the sprayed incombustible material are peeled off or sprayed incombustible. The material is damaged and the amount of decrease in the thickness of the foamed resin-based heat insulating material after the exothermic test is large. Since the decrease in the thickness of the foamed resin-based heat insulating material after the exothermic test is small and the adhesive strength at the interface between the foamed resin-based heat insulating material and the sprayed incombustible material is high, the total amount of cement and rock wool is 100 parts by mass. More preferably, the cement is 45 to 65 parts by mass and the rock wool is 55 to 35 parts by mass.

The apparent density of the sprayed incombustible material after joining the A component and the B component is 0.3 to 1.0 g / cm ^3, and the decrease in the thickness of the foamed resin-based heat insulating material after the test is small. It is preferable because falling due to its own weight hardly occurs after spraying, and 0.35-1.0 g / cm ³ is more preferable. When the apparent density is less than 0.3 g / cm ^{3, the} amount of decrease in the thickness of the foamed resin-based heat insulating material after the test is large. Moreover, when the apparent density is larger than 1.0 g / cm ³ , there is a high possibility of dropping due to its own weight after construction. In order to set the apparent density of the sprayed incombustible material after the A component and the B component are merged to 0.3 to 1.0 g / cm ³ , the light bulk density is 0.06 to 0.70 g / cm ³ . The proportion of cement and rock wool in the sprayed incombustible material after combining the components A and B is 45 parts by weight to 85 parts by weight with respect to a total of 100 parts by weight of cement and rock wool. What is necessary is just to adjust the mixture ratio of the cement and rock wool in A component, the water cement ratio of B component, and the mass ratio of A component and B component so that rock wool may be 15 mass parts-55 mass parts.

  The nonflammable heat insulating structure of the present invention is characterized in that the above-mentioned sprayed nonflammable material is coated on the surface of a foamed resin heat insulating material. That is, cement-containing rock wool (component A) and cement slurry (component B) are joined together by a spraying device, sprayed onto the surface of the foamed resin-based heat insulating material, and the surface of the foamed resin-based heat insulating material is coated with the sprayed incombustible material. Thus, the nonflammable heat insulating structure of the present invention is formed. When covering the surface of the foamed resin-based heat insulating material with the sprayed noncombustible material, a so-called primer or adhesive is applied to increase the adhesive strength between the foamed resin-based heat insulating material and the sprayed noncombustible material, A primer layer (adhesive layer) may be formed between the sprayed incombustible material layer, and that is preferable. Examples of the primer include synthetic rubber such as styrene / butadiene copolymer, chloroprene rubber, acrylonitrile / butadiene copolymer or methyl methacrylate / butadiene copolymer, natural rubber, polyolefin such as polyethylene or polypropylene, polychloropyrene, polyacrylic. Acid ester, styrene / acrylic copolymer, all acrylic copolymer, polyvinyl acetate, vinyl acetate / acrylic copolymer, vinyl acetate / acrylic acid ester copolymer, modified vinyl acetate, ethylene / vinyl acetate copolymer, Vinyl acetate 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, al De resins and synthetic resins such as epoxy resin, are mentioned as examples bituminous are preferable, such as asphalt and rubber asphalt can be used alone or in combination of two or more thereof. Moreover, as a primer, the cement paste or mortar which mixed the 1 type (s) or 2 or more types chosen from a synthetic resin and a bitumen, and 1 type (s) or 2 or more types chosen from cement, a cement slurry, and mortar is used as a primer. Is also preferable. When coating the surface of a foamed resin-based heat insulating material with a sprayed incombustible material, one or more emulsions selected from synthetic resins and bituminous materials, or one or two types selected from cement, cement slurry, and mortar. The primer layer is applied between the foamed resin-based heat insulating material layer and the sprayed non-combustible material layer by coating the surface of the foamed resin-based heat insulating material with a primer made of cement paste or mortar mixed with the above and then covering the sprayed non-combustible material. Is preferable because the adhesive strength between the foamed resin-based heat insulating material layer and the sprayed incombustible material layer is increased.

  Further, the method for constructing a non-combustible heat insulating structure of the present invention is a method in which a foamed resin-based heat insulating material is disposed on the surface of the structure, and then the surface of the foamed resin-based heat insulating material is coated with the sprayed non-combustible material by a spraying method. It is characterized by doing. In other words, a foamed resin-based heat insulating material is disposed on the surface of the structure, and cement-containing rock wool (component A) and cement slurry (component B) are joined to the surface of the foamed resin-based heat insulating material by a spraying device. It is characterized by doing. 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 a foamed resin-based heat insulating material using screws, bolts, nuts, nails or attachments, etc., and affixing a sheet, plate or block coated or bonded with a foamed resin-based heat insulating material to the structure surface using an adhesive Method, sheet coated or bonded with foamed resin-based heat insulating material, method of attaching a plate or block to the surface of the structure using screws, bolts, nuts, nails or fittings, etc., sheet coated or bonded with foamed resin-based heat insulating material A method of fitting a plate or a block into a structure or its gap so as to cover the surface of the structure may be used, and these may be used in combination. Moreover, you may apply | coat a primer (adhesive) to the surface of this foamed resin-type heat insulating material, before coat | covering said spraying noncombustible material on the surface of a foamed resin-type heat insulating material with a spraying construction method. As a primer, cement paste or mortar in which one or more emulsions selected from the above-mentioned primers, particularly synthetic resins and bitumen, or one or more selected from cement, cement slurry, and mortar are further mixed. It is preferable to use a primer comprising

[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, using a spraying device used for spraying semi-dry spraying rock wool, the spraying material prepared as shown in Table 1 on the surface of the foamed resin-based heat insulating material is 30 mm thick. It was sprayed to become. Before spraying the spray material on the surface of the foamed resin-based heat insulating material, Primer A (41.4 g) or Primer B (414.1 g) was applied as a primer to the surface of the foamed resin-based heat insulating material.

Also, the spray material is a component-containing rock wool produced by dry mixing granulated rock wool and cement in advance with a mixer, which is equipped with an anti-cotton machine and a quantitative supply machine and is quantitatively pumped by a blower connected to a blower. ) And B component (cement slurry produced by mixing water and cement with a mixer), which were metered by a pump, were discharged separately from the nozzle tip and joined to produce a spray material. The spray material was manufactured and sprayed on the surface of the foamed resin heat insulating material at the same time. The materials used for the spray material and the primers used are shown below.
[Materials used for spraying materials]
・ Cement: Ordinary Portland cement (manufactured by Taiheiyo Cement Co., containing 70 mass% or more of calcium silicate mineral)
・ Granular rock wool: Rock wool granular cotton (manufactured by Taiheiyo Materials)
・ Water: Tap water (Sakata City, Chiba Pref.)
[Primers used]
Primer A: “Pacific Spray Bond” (trade name, acrylic copolymer emulsion, solid content 60% by mass) manufactured by Taiheiyo Materials Co., Ltd., symbol: A
Primer B: 36.4 parts by mass of “Primer for Pacific Fendrite” (trade name, styrene / butadiene copolymer latex) manufactured by Taiheiyo Materials Co., Ltd. is added to 100 parts by mass of cement paste having a water cement ratio of 33.3%. Mixed cement paste, symbol: B

As a quality test of the produced A component (cement-containing rock wool), spraying material (spraying incombustible material) or nonflammable heat insulating structure, as shown below, light bulk density measurement, apparent density measurement, adhesion strength test and heat generation A test was conducted. The measurement results of the light bulk density of the component A are shown in Table 1, and the other test results are shown in Table 2.
<Measurement of light bulk density>
The lightly loaded bulk density of the prepared component A (cement-containing rock wool) was determined by the following procedure.
-The mass (Wx) of a steel container whose internal volume (Vx) was known (in this test, 2 L) was measured.
-Cement-containing rock wool was gently filled in the steel container until it overflowed from the steel container so as not to drop.
-Next, the sample of the A component in a state of being piled up on the upper surface of the container (sample overflowing from the upper surface of the container) was removed by scraping with a ruler.
・ Measure the mass of the container filled with the A component sample (total mass of the sample and the steel container) (Wy), and calculate the mass of the sample (cement-containing rock wool) in the steel container from the following formula (2) ( Wr) was calculated.
Wr = Wy−Wx (2)
-The lightly loaded bulk density (Mr) of the component A (cement-containing rock wool) was calculated by the following formula (3).
Mr = Wr / Vx (3)

<Measurement of apparent density>
The apparent density of the produced sprayed material (sprayed incombustible material) was determined by the following procedure.
-The said test body which laminated | stacked the foaming resin-type heat insulating material and spray material (spraying incombustible material) which consist of hard urethane foam on the flexible board produced above was cured indoors for one month after preparation.
-The thickness (Xa) which combined the spraying material (spraying incombustible material) of a nonflammable heat insulation structure and the foamed resin-type heat insulating material with the thickness gauge was measured.
-Only the spraying material (spraying incombustible material) was cut out with a spray rock wool exclusive cutting device with an inner diameter of 80 mm.
-The thickness (Xb) of the foamed resin-based heat insulating material at the location where only the spraying material (spraying incombustible material) was cut out was measured using a thickness gauge.
-The volume of the sprayed material cut out was calculated by the following formula (4).
V (cm ³ ) = 4 × 4 × π × (Xa−Xb) (4)
-The cut-out spray material was dried using a dryer until the mass became constant at 105 ° C.
-By the following formula (5), the apparent density ρ of the sprayed material (sprayed incombustible material) was determined using the mass w (g) when the mass became constant.
ρ (g / cm ³ ) = w (g) ÷ V (cm ³ ) (5)

<Adhesion strength test>
・ Incision to reach the flexible board from the spray material (spraying incombustible material) to the above test body in which the foamed resin-based heat insulating material made of rigid urethane foam and the spraying material (spraying incombustible material) are laminated on the flexible board produced above. When viewed from the surface, it was put in a cross-beam shape with a cutter knife so that the center of the cross-beam shape was a 100 × 100 mm square when viewed from directly above.
-A flat plate of a test jig in which a steel plate having a square end with a side of 100 mm and a hook-shaped steel bar at the top end is vertically set up and fixed to the center of the flat plate has a side of 100 mm at the center of the cut. The square surface was bonded with an epoxy adhesive.
-After the adhesive was cured, a push-pull gauge was attached to the hook-shaped portion of the test jig, the test jig was pulled vertically to break, and the maximum load at that time was measured.
・ The maximum load was divided by the breaking area to determine the bond strength.

<Exothermic test>
-Exothermic test of JIS A 5430 was conducted, and the total calorific value for 20 minutes after the start of heating was determined. At this time, the test body was a test body in which a foamed resin-based heat insulating material made of rigid urethane foam having a thickness of 20 mm and a spraying material having a thickness of 25 mm (blowing incombustible material) were laminated on a flexible board (100 × 100 × 5 mm). The prepared specimen was cured in the room for one month after preparation and then subjected to the test.
-It heated for 20 minutes and calculated | required the reduction | decrease amount of the thickness of the foamed resin-type heat insulating material which consists of a rigid urethane foam before and behind a heating.
・ As a nonflammability evaluation, the case where 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 by heating for 20 minutes is 10 mm or less. Judgment was good, and the others were judged as poor.

Each of the spray materials (formulation Nos. 1 to 6) corresponding to the examples of the present invention has a total calorific value of not more than 8.0 MJ / m ^{2 for} 20 minutes after the start of heating, and a foamed resin-based heat insulating material by heating for 20 minutes. The amount of reduction in thickness was 10 mm or less, and the evaluation of nonflammability was good. In particular, a blend of 99 to 142 parts by mass of cement slurry (component B) and 100 to 200% of the water-cement ratio of cement slurry (component B) to 100 parts by mass of cement-containing rock wool (component A) No. The spray materials of 2 to 6 are particularly non-flammable, with a total heat generation amount of 4.0 MJ / m ² or less for 20 minutes after the start of heating and a thickness reduction amount of the foamed resin-based heat insulating material by heating for 20 minutes of 4 mm or less. It was excellent. On the other hand, the formulation No. corresponding to the comparative example of the present invention. In the spray material of No. 7, the amount of decrease in the thickness of the foamed resin heat insulating material by heating for 20 minutes exceeded 10 mm, and the evaluation of nonflammability was poor. Moreover, as for the spraying material (formulation No. 1-6) which hits the Example of this invention, all use A component in the range whose light load bulk density is 0.06-0.70 g / cm < ³ >, A component and B The ratio of cement and rock wool in the spray material (spraying incombustible material) after combining the components is 45 to 85 parts by mass of cement and 15 parts by mass of rock wool for a total of 100 parts by mass of cement and rock wool. in the range of 55 parts by weight, an apparent density of Coatings after being merged with the a component and the B component in the range of 0.3~1.0g / cm ³ 0.35~0.96g / cm ³ .

  INDUSTRIAL APPLICABILITY Since the foamed resin heat insulating material can be made nonflammable, the present invention can be suitably used for construction work such as a building, a condominium, a warehouse, a factory, or a detached house.

Claims (6)

(A) Foam characterized by combining a cement-containing rock wool containing rock wool and cement as main components with (B) a cement slurry containing water and cement as main components by a spraying device. Non-flammable material for resin insulation. The blowing noncombustible material for a foamed resin-based heat insulating material according to claim 1, wherein the cement slurry is 50 to 200 parts by mass with respect to 100 parts by mass of the cement-containing rock wool. The light weight bulk density of the cement-containing rock wool is 0.06 to 0.70 g / cm ³ , and the total amount of cement and rock wool contained is 100 parts by mass, and 45 to 85 parts by mass of cement and rock wool. The incombustible material according to claim 1 or 2, wherein the incombustible material is 15 to 55 parts by mass. A non-combustible heat insulating structure, wherein the surface of a foamed resin heat insulating material is coated with the sprayed non-combustible material according to claim 1. A foamed resin-based heat insulating material is arranged on the surface of the structure, and then the surface of the foamed resin-based heat insulating material is coated with the sprayed incombustible material according to any one of claims 1 to 3 by a spraying method. Construction method of nonflammable heat insulation structure. A cement paste in which one or more emulsions selected from synthetic resins and bituminous materials, or one or more selected from cement, cement slurry, and mortar are mixed on the surface of the foamed resin-based heat insulating material, or 6. The method for constructing a non-combustible heat insulating structure according to claim 5, wherein the sprayed non-combustible material is coated after a mortar primer is applied.