JP2023023125A - Insulation structure of low-temperature warehouse - Google Patents

Abstract

An object of the present invention is to provide a heat insulating structure that does not require work related to application of a fireproof coat, has fire resistance in the heat insulating layer itself, and has moisture permeability suitable for use in a low-temperature warehouse. [Solution] A heat insulating structure for a low temperature warehouse including a refrigerated warehouse and a frozen warehouse, in which the heat insulating layer A provided on the frame B of the low temperature warehouse has moisture permeability that belongs to JISA9526A class 2H or B class, and has a density of 25 kg. /m3 or more, and is further provided with at least a first heat insulating layer 10 made of a field-sprayed urethane foam that is at least quasi-nonflammable in an exothermic test based on ISO-5660. Furthermore, the heat insulating layer A is a laminate further having a second heat insulating layer 20 having a different composition from the first heat insulating layer 10, and the laminate has at least quasi-nonflammability in an exothermic test based on ISO-5660. It may be configured as follows. [Selection diagram] Figure 1

Description

TECHNICAL FIELD The present invention relates to a heat insulating structure for low-temperature warehouses including cold storage warehouses and freezer warehouses.

When using an on-site foaming type urethane foam as a heat insulating layer in a low-temperature warehouse, if the urethane foam is poor in flame retardancy, as described in Non-Patent Document 1 below, the urethane foam after spraying is separately fireproof. A method of applying a coat has been practiced.

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At least one of the following problems arises when using the above method.
(1) The time required for applying the fireproof coating and for applying the primer prior to the application work is increased.
(2) Dew condensation is likely to occur in low-temperature warehouses because of the significant temperature difference between the inside and outside. In particular, if the urethane foam absorbs moisture or water due to condensation occurring in the fire-resistant coating layer, the fire-resistant coating is likely to fall off the urethane foam. .

Therefore, the present invention does not require work related to the application of a fire-resistant coating, etc., and the heat-insulating layer itself has fire resistance, and is equipped with moisture resistance (moisture permeability) suitable for use in low-temperature warehouses. The object is to provide a heat insulating structure.

The present invention, which has been made to solve the above problems, is a heat insulating structure for a low-temperature warehouse including a cold storage warehouse and a freezer warehouse, wherein a heat insulation layer provided on the frame of the low-temperature warehouse comprises a polyisocyanate compound, an ester-based polyol compound, and three containing at least a quantifying catalyst, an additive, a foaming agent and an acrylic surface conditioner, and not containing a silicone foam stabilizer, and further comprising red phosphorus as an essential component, and a phosphate; At least a first insulating layer of a spray-in-place urethane foam comprising at least one of phosphite, hypophosphite, monophosphate, pyrophosphate and polyphosphate. The urethane foam for the first heat insulating layer has a moisture permeability belonging to JISA9526A type 2H or B type, a density of 25 kg / m ³ or more, and furthermore, in a heat build-up test in accordance with ISO-5660 It is characterized by having at least semi-noncombustibility.
Further, in the present invention, the heat insulating layer is a laminate further having a second heat insulating layer having a composition different from that of the first heat insulating layer, and the laminate is at least quasi-noncombustible in an exothermic test in accordance with ISO-5660. It may be configured to have a property.

According to the present invention, at least one of the effects described below can be obtained.
(1) Since it has high flame resistance, there is no need to apply a separate fireproof coating to existing heat insulating materials.
(2) Since the moisture permeability is small, it is possible to suppress the occurrence of dew condensation even in a low-temperature warehouse where the temperature difference between the inside and outside is large, so it is possible to reduce the risk of urethane foam falling from the frame, freeze-thaw, mold, etc.
(3) Since the density of the first heat insulating layer is 25 kg/m ³ or more, it is suitable as a heat insulating layer for low-temperature warehouses requiring high strength.
(4) By replacing part or all of the existing heat insulating layer with urethane foam that constitutes the first heat insulating layer with high flame retardancy to create a laminated structure, without changing the thickness of the entire heat insulating layer, Flame retardancy can be imparted.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic sectional drawing which shows the heat insulation structure which concerns on 1st Example.

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

<1> Overall configuration The heat insulation structure according to the present embodiment is a concrete frame that constitutes a low-temperature warehouse, or a structure frame (hereinafter simply referred to as frame B) formed by installing heat insulating sandwich panels in a building. It has a heat insulating layer A provided.
In FIG. 1 , the heat insulating layer A is composed of a laminate of a first heat insulating layer 10 and a second heat insulating layer 20 .
In addition, although FIG. 1 shows a configuration in which a heat insulating layer is provided directly on the frame B, in the present invention, a moisture-proof layer or other molded heat insulating material is provided between the frame B and the heat insulating layer A. is not excluded, and similarly, a configuration in which a waterproof layer, interior material, pressing concrete, etc. are provided on the surface of the heat insulating layer A opposite to the building body B side is excluded.
Also, the heat insulating layer A may be provided on either the indoor side or the outdoor side of the frame B.
The details of each layer will be described below.

<2> First heat insulating layer (Fig. 1)
The first heat-insulating layer 10 is a heat-insulating layer imparted with flame retardancy.
The first heat insulating layer 10 is composed of a spray-on-site urethane foam, and the urethane foam is mixed with a polyisocyanate compound, an ester polyol compound, a trimerization catalyst, an additive, a foaming agent, and an acrylic surface conditioner. It contains at least and does not contain a silicon-based foam stabilizer, and the additive contains red phosphorus as an essential component, and a phosphate, a phosphite, a hypophosphite, a monophosphate, A composition comprising at least one or more of pyrophosphates and polyphosphates.
A method in which the above composition is divided into a polyisocyanate compound (first liquid) and other components (second liquid), and the two are mixed and sprayed while being sprayed, or both are mixed and sprayed. A heat insulating layer made of foam can be formed by, for example.

<2.1> Material of the first heat insulating layer Details of each material constituting the first heat insulating layer 10 can be appropriately selected from the contents disclosed in Japanese Patent No. 6725606, and the detailed description is omitted.

上記した不燃性能を有するための各材料の最適な配合比は、実験によって適宜導けば良い。 <2.2> Regarding the noncombustibility of the first heat insulating layer The foam obtained with the above composition shall have at least quasi-noncombustibility in the exothermic test according to ISO-5660 shown in Table 1 below. is preferred.
[Table 1]

The optimum compounding ratio of each material for having the above-described nonflammable performance can be appropriately derived through experiments.

<2.3> Moisture Permeability of the First Heat Insulating Layer · pa)] and below).
In low-temperature warehouses, the large temperature difference between the inside and outside makes it easy for condensation to occur. can.
The closed cell ratio of the material constituting the heat insulating layer is desirably 80% or more, and more preferably 90% or more from the viewpoint of reducing moisture permeability.
The optimum compounding ratio of each material for having the above-described moisture permeability can be appropriately derived by experiments. By providing, good moisture permeability can be obtained.

<2.4> Regarding Density of First Heat Insulating Layer It is preferable that the foam obtained by the above composition has a density of 25 kg/m ³ or more.
The heat insulating layer is formed by spray lamination, and as the number of times of lamination increases, the strength increases.
A heat insulation layer used in a low-temperature warehouse is required to have a certain level of strength, so a foam having a density equal to or higher than the above density can satisfy the required strength.
The optimum compounding ratio of each material for having the above-mentioned density can be appropriately derived by experiments, but in particular, the volume ratio of the first liquid to the second liquid, which is often used in on-site foaming spray equipment, should be 1:1. good density can be obtained.
In addition, cracks caused by contraction during freezing and cooling can be suppressed by appropriately arranging a mesh sheet such as a lath mesh between the heat insulating layers.

<3> Second heat insulation layer (Fig. 1)
The second heat insulating layer 20 is a heat insulating layer made of foam having a composition different from that of the first heat insulating layer 10 .
The second heat insulation layer 20 can use a known heat insulation material that has been used in the heat insulation structure of a low-temperature warehouse. It is preferable to appropriately select from those having at least one of the conditions such as those having a low thermal insulation performance, those having excellent heat insulation performance, and the like.
In addition, the second heat insulating layer 20 is not limited to the on-site spray type foamed urethane foam, and may be made of molded foamed urethane foam or the like.

<4> Regarding the non-combustible performance of the heat insulating layer as a whole In this example, the heat insulating layer consisting of the laminate of the first heat insulating layer 10 and the second heat insulating layer 20 as a whole was subjected to an exothermic test in accordance with ISO-5660. At least semi-noncombustible.
As conditions for satisfying the above configuration, it is considered that improving the flame retardancy of the heat insulating layer on the heating surface side, increasing the thickness of the heat insulating layer on the heating surface side, and the like are important.

<5> Performance test 1
A performance test for an example of the heat insulating structure according to the present invention will be described below.

<5.1> Test Materials In this test, the test materials constituting each layer are as follows.
(1) First heat insulating layer 10: Using Aquamoen (registered trademark) (manufactured by Japan Aqua Co., Ltd.) (undiluted solution names AQ800A/AQ100BJ), a foam was prepared according to JISA9526.
(2) Second heat insulating layer 20: Sprayed rigid urethane foam (for normal temperature, low temperature, refrigeration, and freezing) (manufactured by Japan Aqua Co., Ltd.) (undiluted solution name AQ700A / AQ100BJ) is used to form a foam based on the provisions of JISA9526. create.

上記試験体１，２について、コーンカロリーメーターＣ４（（株）東洋精機製作所）を用いて試験時間２０分、輻射熱５０ｋｗでの試験（ＩＳＯ－５６６０に準拠した発熱性試験）を実施した結果を以下の表２，３に示す。 [Table 1]

For the above test specimens 1 and 2, a test (exothermic test in accordance with ISO-5660) was performed using a cone calorimeter C4 (Toyo Seiki Seisakusho Co., Ltd.) for a test time of 20 minutes and a radiant heat of 50 kw. The results are as follows. Tables 2 and 3 of

<5.2> Test results [Table 2]

[Table 3]

As shown in Tables 2 and 3, both laminates of test samples 1 and 2 were found to be nonflammable in the exothermic test in accordance with ISO-5660.

<6> Performance test 2
Next, performance tests for other examples of the heat insulating structure according to the present invention will be described.

<6.1> Test Materials In this test, the test materials constituting each layer are as follows.
(1) First heat insulating layer 10: Using Aquamoen (registered trademark) (manufactured by Japan Aqua Co., Ltd.) (undiluted solution names AQ800A/AQ100BJ), a foam was prepared according to JISA9526.
(2) Second insulation layer 20: Freezer PUF (HFO)
Table 4 below shows the results of an exothermic test conducted in accordance with ISO-5660 by changing the thickness of each heat insulating layer as appropriate and using the first heat insulating layer 10 side as a heating surface.

<6.2> Test results [Table 4]

As shown in Table 4, when the thickness of the first heat insulating layer 10 was set to 30 mm or more as in Test Specimens 4 and 5, the exothermic property test conforming to ISO-5660 resulted in noncombustibility. In addition, when the thickness of the first heat insulating layer 10 was 20 mm as in the test sample 3, the total calorific value in the test time of 10 minutes was less than the reference value, so the thickness of the first heat insulating layer 10 was In the case of 20 mm or more, it was found to have quasi-noncombustibility in the exothermicity test based on ISO-5660.

<7> Summary According to the results shown in the performance tests 1 and 2, the heat insulation layer (having a thickness of about 200 mm) generally used in low-temperature warehouses has a thickness of 20 mm or more, more preferably 30 mm or more, according to the present invention. By replacing with the first heat insulating layer 10, it is possible to impart quasi-noncombustibility or non-combustibility in the exothermic test based on ISO-5660.

In addition, according to the present invention, the heat insulation layer A provided in the low-temperature warehouse can be configured by using only the first heat insulation layer 10 described in the first embodiment (not shown).
The first heat insulation layer 10 is excellent in flame retardancy, heat insulation performance, moisture permeability, density, dimensional change, cost, etc., compared to known heat insulation materials that have been used as heat insulation layers in low-temperature warehouses. For example, all the known heat insulating materials can be replaced with the first heat insulating layer 10 .

A Thermal insulation layer 10 First thermal insulation layer 20 Second thermal insulation layer B Frame

Claims (2)

A thermal insulation structure for low-temperature warehouses including cold storage warehouses and freezer warehouses,
As a heat insulating layer provided on the frame of the low-temperature warehouse,
It 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 the additive contains red phosphorus. A spray-on-site urethane foam containing at least one of phosphate, phosphite, hypophosphite, monophosphate, pyrophosphate and polyphosphate as an essential component having at least a first heat insulating layer,
The urethane foam related to the first heat insulating layer has a moisture permeability belonging to JISA9526A type 2H or B type, a density of 25 kg / m ³ or more, and a heat generation test based on ISO-5660 at least Characterized by having quasi-noncombustibility,
Insulation structure for low-temperature warehouses. The heat insulating layer is a laminate further having a second heat insulating layer having a composition different from that of the first heat insulating layer,
The laminate is characterized by having at least quasi-noncombustibility in an exothermic test in accordance with ISO-5660,
The heat insulation structure of the low-temperature warehouse according to claim 1.

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