JPS583860A - Heat insulating panel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a heat insulating panel.

BACKGROUND ART Conventionally, a heat insulating panel is known that is made by injecting a foamable urethane resin raw material into the middle of metal plates facing each other and foam-molding the material. This conventional heat insulation panel using urethane foam is mainly used in commercial refrigerators and freezers (ζ), but it has poor heat resistance and flame resistance, is smoke-emitting, and can be damaged by i4 panels at high temperatures. Because warping occurs,
For example, there is a problem in that it is unsuitable for applications such as wall materials for refrigerated and frozen warehouses, building interior materials, or wall materials for automobile painting booths used at high temperatures.

Therefore, phenol foam, which has good heat resistance and flame resistance, was used instead of urethane foam, but conventionally, a slab of phenol foam was made in advance, and metal plates were attached to both sides of the slab using an adhesive. Insulating panels were manufactured by joining. While I was
This makes manufacturing the heat insulating panel extremely troublesome and time-consuming, and the phenol foam is extremely brittle and has a problem of low bending strength. In addition, after pasting an inorganic board such as a sekko board on the opposing surface of the metal plate, a phenol foam slab is pasted to these, or a phenol resin raw material is injected between the metal plates with the inorganic board and foam molding is performed. However, since the surface layer of phenol foam becomes powdery and easily peels off, the adhesive force is weak, and therefore the insulation panel cannot have sufficient strength. In addition, there was a problem in that the weight of the panel was increased, and the panel thickness had to be increased because the inorganic board had poor heat insulation performance compared to phenol foam. Furthermore, it is also possible to manufacture insulation panels by injecting a foamable phenolic resin raw material between metal plates arranged facing each other and foaming the material, but the reaction during foam molding of phenolic resin Since the water produced by this method prevents the bonding of the phenolic resin and the metal plate, it has not been possible to produce an integrated heat insulating panel with sufficient strength using this method.

This invention has been made to solve the above problems, and its configuration will be explained below based on embodiments shown in the drawings.

In the drawings, (1) shows a heat insulating panel according to the present invention,
(2) is a pair of metal plates constituting the front and back surfaces of this, and these are made of an aluminum plate, a stainless steel plate, a vinyl chloride resin coated steel plate, or the like. Bent edges (2a) are provided on both left and right edges of the metal plate (2), which are bent inward in a KM shape with one valley and seven directions. (3) are water-absorbing sheets made of kraft paper pasted on the opposing surfaces of these metal plates (2), +41 and +51 are vinyl chloride resin placed on both left and right edges of the heat-insulating R flannel (1). Of these, the left frame material (4): This is a pair of frame materials consisting of a fitting recess (6
), and the right frame member (5) is provided with a fitting convex portion (7). (8) is a heat insulating material made of foamed phenolic resin filled between the metal plates (1) by injection foam molding, and includes a fiber reinforcing material (9) made of glass cloth or the like.

This fiber reinforcing material (9) is, for example, a heat insulating no.
It is contained at a ratio of 009/rre to 6005'/d.

Of course, the fiber reinforcing material (9) may be anything other than glass cloth as long as it has flame resistance. Including such a fiber reinforcement material (9) increases the strength of the heat insulating material (8). In addition, the heat insulating material (8) is joined to the water absorbent sheet (3) during foam molding of phenolic resin.
Therefore, the metal plates (2) on both the front and back sides of the insulation panel (1)
and the internal heat insulating material (8) are connected to each other through the water absorbent sheet (3).

To manufacture the above-mentioned heat insulating panel (1), a water-absorbent sheet (3) made of kraft paper is pasted on each side of a pair of front and back metal plates (2) in advance, and these metal plates with water-absorbent sheets ( 2) are placed facing each other. Then, a matte glass cloth (9) is placed between these metal plates (2), and a frame material [41 (5)] is placed on the left and right edges.Then, these metal plates (2) are placed between each other. A liquid raw material of foamable phenolic resin (resol type) is injected into the middle of the
Foam molding.

During this molding, water is generated due to the reaction of the phenolic resin, but at the interface between the water-absorbent sheet (3) made of kraft paper and the phenol resin raw material, the water is released from the water-absorbent sheet (3).
As the phenolic resin hardens, the water-absorbing sheet (3) and the heat insulating material (8) made of the phenol resin can be firmly bonded to each other, and as a result, the heat insulating panel (1) is integrally molded.

Further, when the glass cloth (3) is foam-molded with phenolic resin, the contact bonding portions between the fibers come off and are dispersed inside the phenolic resin. The heat insulating material (8) made of the foamed phenolic resin thus formed is made of glass cloth (
9), so its strength is very high. Here, the injection foam molding of the phenolic resin can be carried out in a batch mode or a continuous mode.

In the above embodiment, kraft paper is used as the water absorbent sheet (3), but other papers may also be used. It is also possible to use cloth such as cotton or linen, or a water-absorbing laminate made by laminating paper and synthetic resin film or fiber.

Also, instead of such a water absorbent sheet (3), a metal plate (
A moisture-curable urethane adhesive may be applied to the opposing surface of 2). In other words, when such a urethane adhesive is used, the water produced by the reaction of the phenol resin reacts with the urethane adhesive, hardening the adhesive, and removing the water. Insulating material (8) made of foamed phenolic resin including vanes (2) and fiber reinforcement (9)
and are integrally bonded via a urethane adhesive.

Note that it may be included in the heat insulating material (8) made of phenolic resin. Here, as the reinforcing material, glass powder, glass fiber chips, carbon ta fibers, shirasu balloons, phenol balloons, glass balloons, etc. can be used. Since glass powder is alkaline, it can neutralize the acidity of phenol foam and prevent corrosion of metal plates. By including such reinforcing material in the form of powder or short fibers, the strength of the heat insulating material (8) is greatly increased.

In addition, when using balloons such as Shirasu balloons as reinforcing materials dispersed in phenolic resin, they are hollow and have water absorbing properties, so they can absorb water generated during the curing reaction of phenolic resin. Kuradeki,
Once the metal plate (2) was covered with a water-absorbing sheet (
There is no need to paste 3) or apply urethane adhesive. However, it is necessary to provide one of these water-absorbing sheets, moisture-curable urethane resin, and water-absorbing substances such as shirasu balloons between the opposing metal plates (2).

The above insulation panels have very high strength and very low smoke generation, so they can be used as wall materials for refrigerated and frozen warehouses, building interior materials, etc.
It can be used as shutters, doors, partitions, etc., and it has excellent heat resistance and flame resistance, does not warp even at high temperatures, and has excellent dimensional accuracy, so it can be used for example in automotive paint booths, wood drying warehouses, etc. It can be used in food smoking rooms, constant temperature rooms (clean rooms), etc.

The heat insulating panel according to the present invention has a pair of metal plates (2) facing each other at a predetermined distance in an upturned manner, and a fiber reinforcing material (9) is placed between the metal plates (2). )
The foamable phenolic resin raw material is injected into the core (1), and a water-absorbing substance (3) is made to exist, and the phenolic resin raw material is foam-molded in this state, and the water generated during the curing reaction of the phenolic resin is (1) is absorbed by a water-absorbing substance (3), and the heat insulating material (8) made of a cured foamed phenolic resin containing fiber-reinforced batting and both wing plates (2) are integrally bonded. Therefore, the insulation panel (1) has extremely high strength, has excellent heat resistance and flame resistance, does not warp even at high temperatures, and has low smoke generation, so it can be stored in refrigeration.・It can be effectively used for various purposes such as frozen warehouses, architectural interior materials, and automobile painting booths. Since the heat insulating panel (1) can be produced by injection foam molding the phenolic resin containing the fiber reinforcing material (9), the manufacturing operation is extremely simple.

[Brief explanation of drawings]

The drawings show an embodiment of the invention, and FIG. 1 is a partially cutaway perspective view, and FIG. 2 is a partially enlarged sectional view. (1)...insulation panel, (2)...metal plate, (3)
...Water-absorbing sheet (water-absorbing substance), 14+ +51
,, Frame material, (8)... Foamed phenolic resin insulation material, (9)... Fiber reinforcement material. that's all

Claims (1)

[Claims] A pair of metal plates (2) facing each other at a predetermined distance.
A fiber reinforcing material (9) is arranged between the metal plates (2), and a foamable phenolic resin raw material is injected between the metal plates (2), and a water-absorbing substance (3) is made to exist. The phenolic resin raw material is foam-molded, and the moisture generated during the curing reaction of the phenolic resin is absorbed by the water-absorbing substance (3), and the heat insulating material (6) made of the foamed phenolic resin after curing is absorbed into the fiber reinforcement material (6). 8) and both wing plates (2) are integrally connected to a heat insulating panel.