JP4043869B2 - Polyolefin foam sheet for heat insulation of metal roof and method for producing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a polyolefin-based foam sheet suitable for heat insulation of a metal roof and a method for producing the same.
[0002]
[Prior art]
Conventionally, polyolefin-based foam sheets have been frequently used as heat insulating materials for metal roofs from the viewpoint of heat insulation performance such as prevention of condensation of the metal roof materials, heat insulation, and cold insulation. In that case, the foamed sheet is coated with an adhesive that can be heat-bonded to the metal roof plate by heat treatment, and then heat-bonded and bent to heat-treat the metal roof. Further, an adhesive is applied between the foam sheet and the metal plate to perform glue bonding, and heat insulation of the metal roof is performed. When these heat-insulated products are demolished due to aging of the building, the foam sheet and the metal plate are sufficiently bonded, and it is difficult to easily separate and dismantle them. Therefore, it is forced to treat as an industrial waste as a metal plate with a heat insulating material.
[0003]
On the other hand, if the adhesive force between the metal plate and the foam sheet is reduced, the metal roof may be a foam sheet. In this case, since an appropriate adhesive force is required, a foam sheet having a reduced adhesive force cannot be used.
[0004]
[Problems to be solved by the invention]
The present invention has been made in view of the above-described circumstances, and has a sufficient adhesive force when a foam sheet that has been subjected to adhesive processing is attached to a metal plate and bent, and bending can be performed without any problem. An object of the present invention is to provide a polyolefin foam sheet suitable for heat insulation of a metal roof and a method for producing the same, which are easy to disassemble when separating the body sheet and the metal plate.
[0005]
[Means for Solving the Problems]
As a result of intensive studies to achieve the above object, the present inventors have found that the adhesive strength of the foam sheet has a skin strength of 700 kPa or more, and the metal plate of the pressure-sensitive adhesive surface and the pressure-sensitive adhesive surface itself. It has been found that the above-mentioned object can be achieved by making the adhesive strength to be 0.5 N / cm or less, and the present invention has been completed.
[0006]
This invention was made | formed as a result of the said examination, and provides the polyolefin-type foam sheet for metal roof insulation shown to following (1)-(3), and its manufacturing method.
(1) A polyolefin-based foam sheet that is subjected to adhesion processing on one side, and adheres the adhesion-treated surface to a metal roofing material, and has a skin strength of 700 kPa or more on the adhesion-treated surface, and the adhesion A polyolefin foam sheet for heat insulation of a metal roof, characterized in that the adhesive strength to the metal plate of the processed surface and the self-adhesive processing back surface is 0.5 N / cm or less.
[0007]
(2) The polyolefin foam sheet for metal roof insulation according to (1), wherein the polyolefin foam sheet has a closed cell structure.
[0008]
(3) After slicing one surface of a polyolefin-based foam sheet having a closed cell structure, the skin strength is 700 kPa or more on the opposite surface of the slicing surface, and the metal plate of the adhesive processing surface and the adhesive The manufacturing method of the polyolefin-type foam sheet for metal roof heat insulation by which the adhesive process was given so that the adhesive force with respect to a process back surface may be 0.5 N / cm or less.
[0009]
Hereinafter, the present invention will be described in more detail.
One side of the polyolefin foam sheet for heat insulation of metal roof of the present invention is adhesively processed, and the skin strength of the adhesively processed surface is adjusted to be 700 kPa or more. For that purpose, it is achieved by adopting a means of producing a polyolefin foam sheet having a closed cell structure using a chemical cross-linking agent and a chemical decomposition type foaming agent.
[0010]
In the present invention, the skin strength is measured by the following method.
The polyolefin foam sheet of the present invention is punched out into dumbbell pieces for tensile strength measurement specified in JIS. When slicing the polyolefin-based foam sheet of the present invention, the slicing surface is disposed downward, and metal spacers having a thickness of 0.4 mm are disposed on both sides thereof. The thickness of the metal spacer is appropriately set depending on the foam used. A blade is inserted along the thickness direction of the metal spacer to obtain a dumbbell-shaped test piece having the same thickness as the metal spacer. The cutting stress obtained by dividing the maximum load when the test piece is cut at a tensile speed of 200 mm / min by the cross-sectional area formed by the product of the width and thickness of the test piece is defined as the skin strength.
[0011]
Moreover, in order to make the adhesive force with respect to the metal plate of an adhesion processing surface and the said adhesion processing surface to be 0.5 N / cm or less, the means for performing the coating amount and material selection of the adhesive used as an adhesion layer are suitably used. This is achieved by adopting it.
In the present invention, the adhesive strength is measured by the following method.
Using a metal plate used as a folded half roof, the polyolefin foam sheet subjected to the adhesive processing of the present invention is cut into a width of 25 mm and placed on the metal plate, and is crimped using a rubber roller having a mass of 2 kg. The strength when the peel test is performed at a peel rate of 200 mm / min is defined as the adhesive strength to the metal surface.
In addition, two test pieces obtained by cutting the polyolefin-based foam sheet of the present invention into a width of 25 mm are prepared, and the adhesive processed surface of the first test piece is overlapped with the back surface opposite to the adhesive surface of the other test pieces. In addition, the strength when the peel test is performed under the same conditions as the method for measuring the adhesive strength is defined as the self-rear adhesive strength.
[0012]
The adhesive force between the adhesive processed surface and the metal surface is necessary when bending and dismantling the metal roof, whereas the adhesive force between the adhesive processed surface and the back surface of the foamed sheet is made into a roll. It is necessary for easy peeling of the skin surface and the back surface when wound up, and in the present invention, there is no problem in both cases.
By adopting the configuration as described above, it is possible to roll the foam sheet without requiring the release sheet to be present on the pressure-sensitive adhesive surface or the release surface on the surface opposite to the pressure-sensitive adhesive surface. Even if it supplies in the shape, it can supply smoothly in the case of lamination | stacking with a metal plate.
[0013]
Further, in the case of a polyolefin-based foam sheet having a closed cell structure in the present invention, the closed cell layer forms an air layer and maintains a stable thermal conductivity. is there.
Specifically, examples of the polyolefin foam sheet having a closed cell structure include foam ace manufactured by Furukawa Electric Co., Ltd., Softlon manufactured by Sekisui Chemical Co., Ltd., and high ethylene manufactured by Hitachi Chemical Co., Ltd. can do.
[0014]
In addition, after slicing one side of a polyolefin-based foam sheet having a closed cell structure, the skin strength is 700 kPa or more on the opposite surface of the slicing surface, and the metal plate of the adhesive processing surface and the adhesive processing Although the polyolefin foam sheet for heat insulation of metal roof is manufactured by performing the adhesive processing so that the adhesive strength to the surface is 0.5 N / cm or less, the slicing is a dew condensation when used as a heat insulating material. This is performed for water retention and prevention of external damage, and is appropriately performed by a method in which the thickness direction is cut in half by a rotary blade.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described, but the present invention is not limited to the following examples.
[0016]
[Example 1]
Density: 25 kg / m ³ , cross-linked foamed polyethylene sheet having a skin strength of 812 kPa (trade name: Foam Ace, manufactured by Furukawa Electric Co., Ltd.) and acrylic adhesive (Dainippon Ink Chemical Co., Ltd.) at 40 g / m ² It was applied and bonded to a galvanized steel plate. Thereafter, it was bent into a predetermined shape. When the peel strength was measured after processing, it was 0.3 N / cm, and the foam sheet could be peeled without remaining on the steel sheet surface. The back surface peel strength was 0.11 N / cm.
[0017]
[Example 2]
Density: 22 kg / m ³ , cross-linked foamed polyethylene sheet with a skin strength of 859 kPa (trade name: Foam Ace, manufactured by Furukawa Electric Co., Ltd.) and acrylic adhesive (Dainippon Ink Chemical Co., Ltd.) at 50 g / m ² It was applied and bonded to a galvanized steel plate. Thereafter, it was bent into a predetermined shape. When the peel strength was measured after processing, it was 0.2 N / cm, and it was possible to peel the foamed sheet without leaving a foam sheet. The back surface peel strength was 0.14 N / cm.
[0018]
[Comparative Example 1]
Density: 23 kg / m ³ , cross-linked foamed polyethylene sheet (trade name: Slim Ace, manufactured by Furukawa Electric Co., Ltd.) having a skin strength of 659 kPa and acrylic adhesive (Dainippon Ink Chemical Co., Ltd.) at 20 g / m ² It was applied and bonded to a galvanized steel plate. Thereafter, it was bent into a predetermined shape. When the peel strength was measured after processing, the peel strength was 0.41 N / cm, and the foam sheet could be peeled without leaving a foam sheet. Further, the peel strength of the back surface was 0.39 N / cm, and some destruction of the skin material was observed.
[0019]
[Comparative Example 2]
Density: 23 kg / m ³ , cross-linked foamed polyethylene sheet having a skin strength of 659 kPa (trade name: Slim Ace, manufactured by Furukawa Electric Co., Ltd.) and acrylic adhesive (Dainippon Ink Chemical Co., Ltd.) at 30 g / m ² It was applied and bonded to a galvanized steel plate. Thereafter, it was bent into a predetermined shape. When the peel strength was measured after processing, the foam sheet remained on the steel plate surface due to the destruction of the skin material at 0.55 N / cm. The self-back surface peel strength was 0.48 N / cm, and skin material destruction was observed.
[0020]
【The invention's effect】
As described above, the polyolefin foam sheet for heat insulation of metal roof according to the present invention can be provided in a state in which a release film or the like is not used on the adhesive surface as well as a release treatment on the back surface. Moreover, separation of the metal roof material and the foam sheet after disassembly is facilitated, and the metal roof material can be separated into a recyclable state instead of being made into industrial waste.

Claims (3)

Adhesive processing is applied to one side, a polyolefin foam sheet for adhering the adhesive processed surface to a metal roof material, the skin strength of the adhesive processed surface is 700 kPa or more, and the adhesive processed surface A polyolefin foam sheet for heat insulation of a metal roof, characterized in that the adhesive strength to the metal plate and the back surface of the adhesive processing is 0.5 N / cm or less. The polyolefin foam sheet for metal roof insulation according to claim 1, wherein the polyolefin foam sheet has a closed cell structure. After slicing one surface of a polyolefin-based foam sheet having a closed cell structure, the skin strength of the opposite surface of the slicing surface is 700 kPa or more, and the metal plate of the adhesive processing surface and the adhesive processing own back surface The manufacturing method of the polyolefin-type foam sheet for heat insulation of a metal roof by which the adhesive process was given so that the adhesive force with respect to it might be 0.5 N / cm or less.