JP2016153577A - Backside material for siding board, siding board, and method of manufacturing backside material for siding board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a backside material for a siding board, which has higher fire retardancy.SOLUTION: A backside material for a siding board includes a sheet layer 7a that is formed by processing glass fibers by an organic binder, and a protective layer 7b that is formed on one surface of the sheet layer 7a and made of a thermoplastic resin. The total of an organic mass of the organic binder included in the sheet layer 7a and an organic mass included in the thermoplastic resin is 30 g/mor less.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a backside material of a siding board, a siding board, and a method for manufacturing a backside material of a siding board.

A siding board is provided with a synthetic resin foam as a heat insulating layer on one surface of a plate or sheet-like member (plate, etc.), and another plate on the surface of the foam on the side where there is no plate, etc. It has the structure which provided.
In the present specification, one of the plate materials and the like is referred to as a surface material, and the other plate material and the like are referred to as a back material. A structure in which a foam is provided between the front surface material and the back surface material is also called a sandwich structure.

In the case of a metal siding board, a steel plate is used as the surface material, and the steel plate is subjected to a pattern or embossing drawn by painting or printing. As the back material of the metal siding board, a glass fiber paper laminated with a thermoplastic resin and an aluminum layer is used.
According to the said back material, the dimensional stability of a back material and the sealing of a synthetic resin foam are realizable. In addition, the metal siding board provided with such a back material is described in the cited reference 1, for example.

JP 2002-4548 A

  However, in recent years, particularly in urban areas, efforts to accelerate the incombustibility of the densely populated area have become active. For example, the Tokyo Metropolitan Government is working on the “Kimitsu area incombustible 10-year project” led by the Tokyo Metropolitan Bureau of Urban Development. This initiative aims at the active adoption of building materials that have been certified as non-combustible materials and semi-incombustible materials by establishing a special non-combustible zone. Due to such administrative trends, there is an increasing need for siding boards that have been certified as non-combustible materials or semi-incombustible materials by the Ministry of Land, Infrastructure, Transport and Tourism.

  The present invention has been made on the basis of the above points, and as a non-combustible material, a semi-incombustible material, etc., a siding board having a flame retardancy that satisfies higher requirements, a siding board using the back material, and a siding It aims at providing the manufacturing method of the back surface material of a board.

In order to solve the above problems, the back material of the siding board of the present invention is a sheet layer formed by treating glass fibers with an organic binder, and a thermoplastic resin formed on one surface of the sheet layer. A total of the organic mass of the organic binder contained in the sheet layer and the organic mass contained in the thermoplastic resin is 30 g / m ² or less.

  According to such an invention, as a non-combustible material, a semi-incombustible material, etc., there is provided a backside material of a siding board having a flame retardancy that satisfies higher requirements, a siding board using the backside material, and a method for manufacturing the backside material of the siding board. Can be provided.

It is sectional drawing for demonstrating the siding board of one Embodiment of this invention. It is sectional drawing for demonstrating the back surface material of the siding board shown in FIG. It is a figure which shows the result of having evaluated the effect of one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described.
(Siding board)
FIG. 1 is a cross-sectional view for explaining the siding board of the present embodiment. The siding board 1 of the present embodiment includes a back surface material 7, a front surface material 3, and a foam 5 that forms a sandwich structure together with the front surface material 3 and the back surface material 7.

  The surface material 3 is a metal surface material, for example, aluminum, an iron plate, steel, copper, etc. are used. For example, a pattern imitating a grain or the like is painted or printed on the surface of the metal surface material. Further, the surface of the surface material 3 can be decorated or embossed by embossing or the like. Although the thickness of a metal surface material is arbitrarily determined according to the use and design of the siding board 1, about 0.27 mm to 0.40 mm is suitable, for example.

  The foam 5 is not particularly limited as long as it is a hard plastic foam that satisfies a predetermined heat insulating property. However, the foam 5 has a self-adhesive property with respect to the surface material 3 and the back material 7, and is rigid polyurethane foam, isocyanurate foam and phenol integrated with the surface material 3 and the back material 7 simultaneously with foam formation. Foam is preferred. In addition, although the thickness of the foam 5 is arbitrarily set according to the use and design of the siding board 1, about 12 mm to 18 mm is suitable.

(Backside material of siding board)
FIG. 2 is an enlarged view of the back surface material 7 shown in FIG. The back material 7 is composed of a sheet layer 7a and a protective layer 7b. The protective layer 7b is formed on one surface of the sheet layer 7a.
According to such a configuration, the foam 5 of the siding board 1 is provided on the surface opposite to the surface on which the protective layer 7b of the sheet layer 7a of the back material 7 is provided. Further, the surface material 3 is provided on the surface opposite to the surface in contact with the sheet layer 7 a of the foam 5.
A glass base material layer is used for the sheet layer 7a. As a glass base material layer, if it is a member containing glass fiber, it can be especially used without a restriction | limiting. As such a member, there is one obtained by processing (fused) glass paper or glass fiber with an organic binder.

Polyvinyl alcohol or vinyl acetate is used for the organic binder used for the glass substrate. In this embodiment, the organic mass contained in the organic binder in the sheet layer 7a is defined by the following formula (1). In this embodiment, the organic mass of the organic binder is 10 gm / cm ² or less.
Organic mass (sheet layer)
= Sheet layer weight (when dried) g / m ² × Organic content in sheet layer (W%) Formula (1)
The protective layer 7b contains a thermoplastic resin. As the thermoplastic resin used for the protective layer 7b, a polyethylene resin is suitable. In addition to the polyethylene resin, polyurethane, polyvinyl acetate, various rubber materials, and the like can be used for the protective layer 7b.

Moreover, in this embodiment, the organic mass contained in the protective layer 7b is defined by the following formula | equation (2).
Organic mass (protective layer)
= Weight of protective layer (when dried) g / m ² × organic content in protective layer (W%) Formula (2)
In the present embodiment, the total of the organic mass of the organic binder in the sheet layer 7a and the organic mass in the protective layer 7b is set to 30 g / m ² or less.

Moreover, in this embodiment, the weight per unit area of the protective layer is 20 gm / cm ² or less.
Although the thickness of the back surface material 7 is arbitrarily set according to the use and design of the siding board 1, it is about 0.15 mm to 0.30 mm. Further, the thickness of the back material 7 is the total thickness of the sheet layer 7a and the protective layer 7b. Of these, the thickness of the sheet layer 7a is about 135 μm to 290 μm, and the thickness of the protective layer 7b is 10 μm. It is about 30 μm.

(Manufacturing method of backside material of siding board)
Next, the manufacturing method of the said back surface material 7 of this embodiment is demonstrated.
In the present embodiment, first, a sheet layer 7a in which glass fibers are held by an organic binder is made. The sheet layer 7a is formed by uniformly applying an organic binder to glass fibers, thermally polymerizing the organic binder, and connecting the glass fibers together.

Next, in this embodiment, the foam 5 is formed using a thermoplastic resin containing a polyethylene resin. The foam 5 is formed by applying a thermoplastic resin or laminating a thermoplastic resin film.
Next, examples of the back surface of the siding board described above will be described, and the effects thereof will be described.

(Example)
First Example In the first example, Oji F-Tex Co., Ltd. GHN-35 (product name) was used for the sheet layer. This sheet layer is produced by using 4.8 g / cm ^{2 of} an organic binder containing vinyl acetate with respect to 29.1 g / cm ^{2 of} glass fiber. The basis weight of the produced sheet layer was 33.9 g / cm ² .

In the first example, a protective layer was formed on the sheet layer using Asahi Kasei Chemicals Corporation Suntech L2340 (product name) as the thermoplastic resin. Formation of the protective layer was continuously performed so that the weight per unit area of the protective layer was 20 g / cm ² .
In Example 1, the total of the organic mass of the organic binder in the sheet layer and the organic mass of the protective layer was 30 g / m ² or less, specifically 24.8 g / m ² .

Second Example In the second example, Oji F-Tex Co., Ltd. GHN-30 (product name) was used for the sheet layer. The sheet layer, an organic binder containing a vinyl acetate 4.3 g / cm ² using the glass fibers 25.7 g / cm ^2, the basis weight is produced so that 30 g / ^{m 2.}
In the second example, a protective layer was formed on the sheet layer using Asahi Kasei Chemicals Corporation Suntech L2340 (product name) as the thermoplastic resin. Formation of the protective layer was continuously performed so that the weight per unit area of the protective layer was 20 g / cm ² .
In 2nd Example, the sum total of the organic mass of the organic binder in a sheet | seat layer and the organic mass of a protective layer was 30 g / m < ² > or less, Specifically, it was 24.3 g / m < ² >.
In order to compare with the examples described above, the inventors of the present invention produced a back material of a siding board as a comparative example under the following conditions.

(Comparative example)
In the comparative siding board, a sheet layer was produced under the same conditions as in the first example. Then, Asahi Kasei Chemicals Corporation Suntec L2340 was used as the thermoplastic resin, and a protective layer was formed on the sheet layer. The formation of the protective layer was continuously performed so that the weight per unit area of the protective layer was 50 g / cm ² .
Incidentally, the sum of the organic mass of the protective layer and an organic mass of the organic binder in the sheet layer in the comparative example, more than 30 g / m ^2, specifically, was 54.8 g / m ^2.
Next, evaluation of the back material of the siding board of the first embodiment, the second embodiment, and the comparative example will be described.

(Evaluation method)
Dimensional shape The evaluation of the dimensional shape was performed by repeatedly placing the back surface material of the siding board in a low temperature environment and a high temperature environment (cooling cycle), and then visually evaluating the warpage of the back surface material. Specifically, the back material was placed in an environment at −20 ° C. for 12 hours, and then placed in an environment at 80 ° C. for 12 hours 10 times (10 cycles of cooling and heating). And the thing which remarkable warp was not seen visually was evaluated as "(circle)", and the thing where remarkable warp was seen was evaluated as "x".

Sealing of foam The sealing was evaluated by preparing a siding board using the back material, and whether or not the foam leaked from the back material in this siding board. Specifically, polyurethane and isocyanerene were mixed, and a synthetic resin foam was produced by a mechanical foaming method. Next, the foam was applied and molded on each of the back materials of the first example, the second example and the comparative example. Then, three types of siding boards were produced by superposing a metal surface material on the foam, putting it in a drying furnace and drying it.
The inventor of the present invention visually confirmed whether or not the foam leaked from the back material in the three types of siding boards. And the thing which the foam did not leak was evaluated as "*", and the thing which leaked was evaluated as "(circle)".

Flame retardancy The flame retardancy was evaluated by a heat generation test using a cone calorimeter (based on ISO 5660-1). Specifically, first, a rectangular parallelepiped specimen having a side of 10 cm is prepared from the back materials of the first example, the second example, and the comparative example. All the test bodies are installed horizontally. A constant radiant heat is applied to the test body, and the combustible gas generated by the thermal decomposition is ignited by an electric spark. Further, exhaust gas generated by 10 minutes of combustion is collected by a duct, and the total calorific value is obtained by measuring the amount of oxygen consumed by the combustion.

In the field of siding boards, it is essential that the total calorific value is 8.0 J / m ² or less in order to receive certification of non-combustible material or semi-incombustible material. However, since the lower the total calorific value is, the higher the flame retardancy is, so here, when the total calorific value is 2.0 J / m ² or less, “◯”, and when it is larger than 2.0 J / m ² , “×”. It was evaluated.
FIG. 2 is a diagram showing the results of evaluating the back surface materials of the first example, the second example, and the comparative example with respect to the above-described three items of dimension, shape, and flame retardancy.

As is clear from FIG. 2, the first example and the second example obtained an evaluation of “◯” in any of dimensional stability, sealing, and flame retardancy. In particular, regarding the flame retardancy, a low total calorific value of 1.2 J / m ² in the first example and 1.0 J / m ^{2 in} the second example was confirmed.
However, the comparative example had a total calorific value of 4.5 J / m ^2, which was higher than the total calorific value of the first and second examples, and could not satisfy the evaluation criteria of this example.

  The present invention described above is suitable for a siding board used for any application as long as the siding board is required to have flame retardancy.

3 Surface material 5 Foam 7 Back surface material 7a Sheet layer 7b Protective layer

Claims (7)

A sheet layer formed by treating glass fibers with an organic binder;
A protective layer made of a thermoplastic resin formed on one surface of the sheet layer;
Including
The back material of a siding board, wherein the total of the organic mass of the organic binder contained in the sheet layer and the organic mass contained in the thermoplastic resin is 30 g / m ² or less.   The back material of a siding board according to claim 1, wherein the organic binder includes polyvinyl alcohol or vinyl acetate resin. The backside material of a siding board according to claim 1 or 2, wherein the organic mass of the organic binder is 10 g / m ² or less.   The said thermoplastic resin contains polyethylene resin, The back surface material of the siding board of any one of Claim 1 to 3 characterized by the above-mentioned. 5. The back material of a siding board according to claim 1, wherein the thermoplastic resin has a weight per unit area of 20 g / cm ² or less. The back material of the siding board according to any one of claims 1 to 5,
A synthetic resin foam provided on the surface of the sheet layer opposite to the surface provided with the protective layer;
A surface material provided on a surface opposite to the surface in contact with the sheet layer of the foam;
A siding board characterized by comprising: Forming a sheet layer by treating glass fibers with an organic binder;
Forming a protective layer made of a thermoplastic resin on one surface of the sheet layer,
The method for producing a backside material for a siding board, wherein the total of the organic mass of the organic binder contained in the sheet layer and the organic mass contained in the thermoplastic resin is 30 g / m ² or less.

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