Method for constructing heat insulation layer

Abstract

To provide a construction method suitable for constructing a heat insulating layer in winter or in cold regions.SOLUTION: A construction method of heat insulating layer in structure comprises at least steps of forming a first heat insulating layer on a surface of a building frame of the structure, and of forming, on the surface of the first heat insulating layer, a second heat insulating layer made of urethane foam having at least semi-noncombustibility in an exothermic test in accordance with ISO-5660. For the first heat insulating layer, urethane foam having a faster curing speed at low temperatures than the second heat insulating layer is used.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for constructing a heat insulation layer suitable for construction in winter or cold regions.

Background Art

[0002] When spraying a heat insulation layer with on-site foamed urethane foam, in a low-temperature environment such as winter or cold regions (e.g., the temperature of the sprayed surface is 10°C or lower), due to poor foaming caused by the temperature drop of each raw material after spraying, poor foaming and a decrease in the curing rate are likely to occur, so it is known that the construction time becomes longer. More specifically, when a large amount of isocyanurate component is present, the isocyanuration reaction hardly proceeds unless the ambient temperature is high. Therefore, if the heat of the resin is quickly taken away, it takes time to react. Therefore, in a low-temperature environment such as winter or cold regions, the one-time spraying thickness is set to 20 mm or more to ensure the heat of reaction, but it has taken a long time exceeding 60 minutes until adhesion and curing. As a result, the overall construction period has been prolonged.

Prior Art Documents

Non-Patent Documents

[0003]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The above problems in the low-temperature environment are not exceptions even in urethane foam with flame retardancy imparted. Even when using such urethane foam, it has been desired to provide a construction method that does not prolong the construction period.

[0005] Therefore, an object of the present invention is to provide a construction method suitable for constructing a heat insulation layer in winter or cold regions.

Means for Solving the Problem

[0006] The invention of the present application made to solve the above problems is 、 A method for constructing a heat insulation layer in a structure, comprising: forming a first heat insulation layer on the surface of the structure body; and forming a second heat insulation layer made of urethane foam having at least quasi-incombustibility in a heat generation test conforming to ISO-5660 on the surface of the first heat insulation layer, and having at least, the first heat insulation layer The constituent material of the second heat insulation layer The urethane foam that constitutes The curing rate at a lower temperature of is fast has a certain composition and is characterized by this. Further, in the present invention, the constituent material of the first heat insulating layer may be composed of a urethane foam having a composition different from that of the urethane foam constituting the second heat insulating layer, a synthetic rubber, an epoxy primer, or a urethane primer. Further, in the invention of the present application, the second heat insulation layer contains at least a polyisocyanate compound, an ester-based polyol compound, a trimerization catalyst, an additive, a foaming agent, and an acrylic-based surface conditioner, and does not contain a silicone-based foam stabilizer. Further, the additive may be composed of red phosphorus as an essential component and contain at least one or more of phosphate, phosphite, hypophosphite, monophosphate, pyrophosphate, and polyphosphate. Further, in the invention of the present application, the thickness of the first heat insulation layer may be 1 mm to 300 mm, and the thickness of the second heat insulation layer may be 30 mm or more. Further, in the invention of the present application, Regarding the constituent material, The adhesion time at 10 °C or lower of the first heat insulation layer can also be set to 5 minutes or less.

Effect of the Invention

[0007] According to the present invention, at least one of the following effects is achieved. (1) By making the first heat insulation layer formed on the surface of the structure body a urethane foam having a composition with a faster curing rate at a lower temperature than the second heat insulation layer, the spraying construction of the second heat insulation layer can be performed in a state where heat is hardly taken away from the structure body through the first heat insulation layer. (2) The first heat insulation layer with a fast curing rate at low temperatures can obtain an adhesive force with the structure even without being thickly sprayed, so that the prolongation of the construction period can be suppressed. (3) By making the urethane foam constituting the second heat insulation layer have a composition more excellent in flame retardancy than the urethane foam constituting the first heat insulation layer, a heat insulation structure imparted with desired flame retardancy can be realized even in a low temperature environment such as winter or a cold region.

Brief Description of the Drawings

[0008]

Figure 1

Embodiments for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Examples

[0010] <1>Overall Configuration (Fig. 1) The method for constructing the heat insulation layer according to this embodiment includes at least a step of forming a first heat insulation layer 10 on the surface of the structure's body A (the first step), and a step of forming a second heat insulation layer 20 made of urethane foam having at least quasi-incombustibility in a heat generation test compliant with ISO-5660 on the surface of the first heat insulation layer 10 (the second step). Fig. 1(a) shows a state in which a heat insulation structure is provided on the surface of a surface material that forms a ventilation layer between an outer wall material for wall insulation of a wooden house. Fig. 1(b) shows a state in which a heat insulation structure is provided on the surface of a concrete body for wall insulation of an RC structure. In each figure, an interior material or the like can be appropriately provided on the surface side of the second heat insulation layer 20, but illustration thereof is omitted in this figure. Hereinafter, details of each step will be described.

[0011] <2>The First Step (Formation of the First Heat Insulation Layer) The first heat insulation layer 10 is a heat insulation layer formed on the indoor side surface of the structure's body A and having excellent curing speed. The first heat insulation layer 10 is composed of a spray-applied urethane foam formed by a method of mixing and spraying a polyisocyanate compound (first liquid) and a polyol compound (second liquid) while spraying, or a method of spraying while mixing the two. The urethane foam can be formed. The thickness (t1) of the first heat insulation layer 10 is not particularly limited, but is usually designed in the range of 1 mm to 300 mm.

[0012] <2.1>Regarding the curing performance of the first heat insulation layer The urethane foam constituting the first heat insulation layer 10 shall have a composition with a faster curing rate than the urethane foam constituting the second heat insulation layer 20 described later. Compositions that can accelerate the curing rate may include Type A1, Type A1H, Type A2, Type A2H, etc. of JIS A9526. Those with an adhesion time to the housing A of within 5 minutes at a temperature of 10°C or lower are desirable, and those for winter use are particularly desirable. In addition, as the first heat insulation layer 10, a one-component or two-component fast-curing urethane foam, a fast-curing type synthetic rubber-based, epoxy-based, or urethane-based primer stored in an aerosol can or the like can also be used.

[0013] <3>Second step (formation of the second heat insulation layer) The second heat insulation layer 20 is a heat insulation layer having excellent flame retardancy performance formed on the surface of the first heat insulation layer 10. Regarding the second heat insulation layer 20 as well, similar to the first heat insulation layer 10, it is composed of a spray-applied urethane foam formed by a method of mixing and spraying a polyisocyanate compound (first liquid) and a polyol compound (second liquid) while spraying, or a method of spraying while mixing the two. It is preferable to start the spraying construction of the second heat insulation layer 20 after the first heat insulation layer 10 is completely adhered to the housing A. The first heat insulation layer 10 preferably has a thickness of 1 mm or more, more preferably 5 mm or more, so that it is difficult to be deprived of heat when the second layer is sprayed and the curing is easily promoted.

[0014] <3.1>Regarding the flame retardancy performance of the second heat insulation layer The urethane foam constituting the second heat insulation layer 20 shall have a composition with better flame retardancy than the urethane foam constituting the aforementioned first heat insulation layer 10. "Better flame retardancy" herein means having at least quasi-incombustibility in the heat release test conforming to ISO-5660 shown in Table 1 below. [Table 1] TIFF0007693444000001.tif38153The optimal mixing ratio of each material for having the above-mentioned incombustibility performance may be appropriately determined by experiments. The thickness (t2) of the second heat insulation layer 20 is not particularly limited, but it is usually designed to be 30 mm or more so as not to easily affect the first heat insulation layer thermally.

[0015] <3.2>Regarding the material of the second heat insulation layer As the urethane foam constituting the second heat insulation layer 20, the urethane foam disclosed in Patent No. 6725606, that is, a material containing at least a polyisocyanate compound, an ester-based polyol compound, a trimerization catalyst, an additive, a foaming agent, and an acrylic-based surface conditioner, and not containing a silicone-based foam stabilizer, and further, the additive contains red phosphorus as an essential component and at least one selected from phosphates, phosphites, hypophosphites, monophosphates, pyrophosphates, and polyphosphates can be selected. Detailed explanations of the details of these materials are omitted.

[0016] <3.3>Regarding the moisture permeability performance of the second heat insulation layer The foam obtained by the above composition preferably has a moisture permeability belonging to JISA9526 Type A 2H (moisture permeability rate of 4.5 [ng / (m·s·pa)] or less). The optimal mixing ratio of each material for having the above-mentioned moisture permeability performance may be appropriately determined by experiments. However, particularly by providing the volume ratio of the first liquid to the second liquid at 1:1, which is common in on-site foaming spraying equipment, good moisture permeability can be obtained. Moreover, the higher the independent bubble rate of the material, the lower the moisture permeability, and those with 80% or more, and further 90% or more are desirable.

[0017] <4> Comparative Experiment Based on the following test conditions, when constructing a heat insulation structure by the method of providing the first heat insulation layer 10 and the second heat insulation layer 20 according to the present invention, and when constructing a heat insulation structure only with the second heat insulation layer 20 according to the present invention, Table 2 shows the comparison results of the construction periods. [Table 2] TIFF0007693444000002.tif122150

[0018] As shown in Table 2 above, compared with the case of providing a heat insulation structure with a single-layer structure having flame retardancy on the surface of the housing A as in Comparative Example 1, even the two-layer structure heat insulation structure according to Example 1 has no influence on the flame retardancy, and the construction period could be significantly shortened.

Explanation of Reference Signs

[0019] A Housing 10 First Heat Insulation Layer 20 Second Heat Insulation Layer

Claims

1. A method for constructing a heat insulation layer in a structure, comprising: forming a first heat insulation layer on the surface of the structure body; forming a second heat insulation layer made of urethane foam having at least quasi-incombustibility in a heat generation test conforming to ISO-5660 on the surface of the first heat insulation layer; and having at least: wherein the constituent material of the first heat insulation layer has a composition with a faster curing rate at a lower temperature than the urethane foam constituting the second heat insulation layer; A method for constructing a heat insulation layer in a structure.

2. The constituent material of the first heat insulation layer is a urethane foam, a synthetic rubber, an epoxy primer, or a urethane primer having a composition different from that of the urethane foam constituting the second heat insulation layer, A method for constructing a heat insulation layer in the structure according to Claim 1.

3. wherein the second heat insulation layer contains at least a polyisocyanate compound, an ester polyol compound, a trimerization catalyst, an additive, a foaming agent, and an acrylic surface conditioner, and does not contain a silicone foam stabilizer, and further the additive has red phosphorus as an essential component and contains at least one or more of phosphate, phosphite, hypophosphite, monophosphate, pyrophosphate, and polyphosphate; A method for constructing a heat insulation layer in the structure according to Claim 1 or 2.

4. wherein the thickness of the first heat insulation layer is 1 mm to 300 mm, and the thickness of the second heat insulation layer is 30 mm or more; A method for constructing a heat insulation layer in the structure according to any one of Claims 1 to 3.

5. The adhesive time of the constituent material of the first heat insulation layer at 10 °C or lower is 5 minutes or less; A method for constructing a heat insulation layer in the structure according to any one of claims 1 to 4.

Images