JP2011208385A - Waterproof underlying sheet, and waterproof structure and waterproofing method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waterproof underlying sheet which eases the level difference and unevenness of a surface of a heat insulating material and enables the installation of a waterproof layer on the smooth surface, and to provide a waterproof structure and a waterproofing method using the same.SOLUTION: The waterproof underlying sheet, which is connected to the surface of the heat insulating material covering an inner surface of a heat storage tank, has a metal layer, a urethane coating layer laminated on one side of the metal layer, and a synthetic resin foaming sheet layer laminated on the other side of the metal layer and having flexibility.

Description

  The present invention relates to a waterproof base sheet used for a waterproof structure of a heat storage tank, a waterproof structure using the waterproof base sheet, and a waterproof construction method.

Conventionally, as one of the energy saving measures, warm water heated by solar heat, cold water heated by cheap electricity at night or warm water is stored in a heat storage tank, and it is used by an air conditioner or fan coil unit during the time when air conditioning is required. Buildings, condominiums, etc. equipped with a heat storage system that heats and cools the building are being constructed.
Conventionally, as a heat storage tank used in the system, in order to prevent heat loss and increase the efficiency of the heat storage tank, a heat insulating material made of a synthetic resin foam such as expanded polystyrene is coated on the inner surface of the concrete casing, and the surface of this heat insulating material A heat insulating waterproof heat storage tank is known which is coated with a waterproof layer such as polyurethane resin.

The building frame is made by combining formwork and pouring concrete into it. Since the formwork generally uses a panel having a length of 1.8 m and a width of 0.9 m, the hardened concrete surface will not be flat unless the panel is seamlessly assembled. The Architectural Institute of Japan / Construction Standard Specification stipulates that the flatness (difference in unevenness) of the wall concrete surface is 7 mm or less per 3 m, and is not allowed to be flat.
When a heat insulating material such as a synthetic resin foam, which is a factory-produced product, is attached to a non-smooth concrete surface, a step is generated between the heat insulating material seams. In addition to steps, scratches and dents may occur on the surface of the synthetic resin foam during construction.

For the waterproofing of the heat storage tank, there is a method of attaching a metal foil to the housing surface or the heat insulating material surface installed thereon for the purpose of waterproof thickness management. The heat storage tank is filled with hot and cold water, and water pressure is always applied to the waterproof layer. If there is a step in the ground, the metal foil will be pulled and be damaged, so it was necessary to apply waterproofing after repairing the ground flat in both methods.
In order to solve this problem, a method of applying a non-woven fabric or a synthetic resin sheet to a metal foil and reinforcing it has been proposed (for example, see Patent Documents 1 and 2).

Patent Document 1 discloses an insulating sheet for waterproof construction, in which an upper film adhesive layer, a fiber layer, and a lower film adhesive layer are laminated and integrated in order from the upper surface side. Moreover, as the fiber layer, a glass fiber nonwoven fabric is exemplified.
In Patent Document 2, when a coating film made of a paint, a coating material, a waterproof coating material, or the like is formed on a base surface, a nonmagnetic metal film is formed on the base surface from paper, synthetic fiber, glass fiber, or the like. A base material made of a composite material formed by laminating a film or sheet made of synthetic resin or synthetic rubber, and then forming the coating film on the base material. A method of forming a film is disclosed. Further, when measuring the film thickness of a paint film, coating material, paint film waterproofing material, etc., formed on the base surface, a non-magnetic metal film is made of paper, synthetic fiber or glass fiber on the base surface. A base material made of a composite material obtained by laminating a film or sheet made of synthetic resin or synthetic rubber, and then forming the coating film on the base material, and then eddy current type A film thickness measuring method for a coating film is disclosed in which a distance from the coating film surface to the nonmagnetic metal film is measured by a film thickness meter.

Japanese Patent Laid-Open No. 2005-139821 JP 2001-288871 A

However, the conventional techniques described in Patent Documents 1 and 2 have the following problems.
The insulation sheet for waterproof construction of Patent Document 1 has a polyethylene film and a polyester sheet bonded to a non-woven fabric as described in Paragraph No. 0014. This is a construction workability as described in Paragraphs 0017, 0019 and 0020. In such a fiber layer, there is a poor ability to follow a step or unevenness generated on the surface of the heat insulating material, and the step or unevenness may be transferred as it is on the insulating sheet and not smooth. For this reason, the step or unevenness directly acts on the waterproof sheet provided on the insulating sheet, and a local tensile force or the like is generated on the waterproof sheet, continuity of the waterproof sheet is impaired, and water leaks from a defective portion. There is a fear.
Moreover, although the sheet | seat of patent document 1 has provided fiber layers, such as a glass fiber nonwoven fabric, when continuity is lost to a waterproof sheet and water leakage generate | occur | produces, the water spreads through a fiber layer and spreads over a wide range. There is a problem.

Patent Document 2 has a film and sheet made of synthetic resin such as polyethylene, synthetic rubber, rubber-modified asphalt, etc., bonded to a metal foil as described in paragraph 0019. In such a combination of materials, There is a poor ability to follow a step or unevenness generated on the surface of the heat insulating material, and there is a possibility that the step or unevenness is transferred as it is on the base surface and is not smoothed. For this reason, the step or unevenness directly acts on the coating film provided on the base surface, and a local tensile force or the like is generated on the coating film. There is.
Further, in paragraph No. 0010 of Patent Document 2, it is described that the base material may be attached only to a part of the base material without being attached to the whole surface. When not adhered, there is a problem that water leakage spreads widely along the non-adhered site when the waterproofing deteriorates.

  The present invention has been made in view of the above circumstances, and provides a waterproof base sheet capable of providing a waterproof layer on a flat surface by reducing steps and irregularities on the surface of a heat insulating material, and a waterproof structure and a waterproof method using the same. With the goal.

  In order to achieve the above object, the present invention is a waterproof base sheet bonded to the surface of a heat insulating material coated on the inner surface of a heat storage tank, and is laminated on one surface side of the metal layer and the metal layer. A waterproof base sheet comprising a urethane coat layer and a flexible synthetic resin foam sheet layer laminated on the other surface side of the metal layer is provided.

  In the waterproof base sheet according to the present invention, the urethane coat layer satisfies a peel strength specified in JIS Z0238 of 30 to 500 g / 15 mm width and a seal strength of 1.0 to 5.5 kg / 15 mm width. Is preferred.

  In the waterproof base sheet of the present invention, the synthetic resin foam sheet is preferably a thermoplastic resin foam sheet having a thickness of 0.5 to 5 mm.

  In the waterproof base sheet of the present invention, the metal layer is preferably made of an aluminum foil having a thickness of 4 to 30 μm.

  In the waterproof base sheet of the present invention, it is preferable that a resin film layer is provided between the metal layer and the urethane coat layer.

  It is preferable that an adhesive layer is laminated on the surface of the synthetic resin foam sheet layer opposite to the metal layer.

  Furthermore, it is preferable that a release paper is stuck on the surface of the adhesive layer opposite to the synthetic resin foam sheet layer.

  Further, the present invention is a waterproof structure applied to the surface of the heat insulating material coated on the inner surface of the heat storage tank, wherein the waterproof surface is joined to the surface of the heat insulating material opposite to the urethane coat layer of the waterproof base sheet. Provided is a waterproof structure characterized in that a base is provided and a waterproof layer is provided on the urethane coat layer of the waterproof base.

  Further, the present invention is a waterproofing method for waterproofing the surface of the heat insulating material coated on the inner surface of the heat storage tank, and bonding the opposite surface of the urethane coating layer of the waterproof base sheet to the surface of the heat insulating material. And providing a waterproof base, and then providing a waterproof layer on the urethane coat layer of the waterproof base.

The waterproof base sheet of the present invention includes a metal layer, a urethane coat layer laminated on one surface side of the metal layer, and a flexible synthetic resin foam sheet laminated on the other surface side of the metal layer. When the synthetic resin foam sheet layer is joined to the heat insulating material surface coated on the inner surface of the heat storage tank to form a waterproof base, the step or unevenness on the surface of the heat insulating material that is the base surface is formed. When the synthetic resin foam sheet follows and deforms, the steps and irregularities transferred to the urethane coat layer side are reduced and relaxed, and the flatness on the urethane coat layer side where the waterproof layer is provided can be secured. It can be prevented that a local tensile force acts on the waterproof layer due to a step or unevenness on the surface of the heat insulating material, the continuity is impaired, and water leakage is prevented.
In addition, since the waterproof base sheet of the present invention has a metal layer on the synthetic resin foam sheet layer, after forming the waterproof layer, the metal layer is detected as a pinhole test using a high voltage flaw detector (pinhole tester). The film thickness of the waterproof layer can be measured with an eddy current film thickness meter.

It is a perspective view which shows an example of the waterproof base sheet of this invention. It is a perspective view for demonstrating the level | step difference mitigation effect at the time of adhere | attaching the waterproof base sheet of this invention on the heat insulating material which has a level | step difference. It is a perspective view of the waterproof base sheet manufactured in the Example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of the waterproof base sheet of the present invention. The waterproof base sheet 1 of this embodiment is a waterproof base sheet bonded to the surface of the heat insulating material 5 covered on the inner surface of the heat storage tank, and is laminated on the metal layer 3 and one surface side of the metal layer 3. The urethane coat layer 4 and the flexible synthetic resin foam sheet layer 2 laminated on the other surface side of the metal layer 3 are provided.

  In the waterproof base sheet 1, the urethane coat layer 4 is preferably a resin material that functions as a primer for firmly bonding the waterproof layer formed thereon and the heat insulating material 5 via the waterproof base sheet 1. This urethane coat layer 4 has a peel strength specified in JIS Z0238 of 30 to 500 g / 15 mm width, preferably 150 to 350 g / 15 mm width, and a seal strength of 1.0 to 5.5 kg / 15 mm width, preferably 2.0. It is preferable to satisfy the performance of ˜5.5 kg / 15 mm width. Examples of preferred commercially available materials for the urethane coat layer 4 include trade name “HIRAMIC” manufactured by Dainichi Seika Kogyo Co., Ltd. and trade name “Lamiol” manufactured by Sakata Inx Corporation.

This urethane coat layer 4 may be wet laminated or dry laminated directly on one surface side of the metal layer 3 or on the surface of the resin film layer laminated on the metal layer 3, and the coating amount is 0.03. It is preferable to set it as the range of -5.0 g / m < ² >.

  In this waterproof base sheet 1, the metal layer 3 can be a metal foil, a synthetic resin film provided with a metal vapor-deposited film, a synthetic resin film laminated with a metal foil, or the like. As the metal, aluminum, aluminum alloy, copper, copper An alloy, a titanium alloy, etc. are mentioned. Among these, it is preferable to use an aluminum foil having a thickness of 4 to 30 μm for the metal layer 3.

  The metal layer 3 improves the waterproof property of the waterproof base sheet 1 itself. Further, after providing a waterproof layer on the waterproof base sheet 1, the metal layer 3 is used as a detection target to detect a high voltage flaw detector (pinhole tester). ) Can be used for pinhole inspection and eddy current film thickness measurement to measure the waterproof layer thickness, making it easy and reliable to perform inspections after waterproof construction and measure the degree of deterioration of the waterproof layer. it can.

  In this waterproof base sheet 1, the synthetic resin foam sheet layer 2 is deformed following the steps and irregularities on the surface of the heat insulating material 5, and the steps and irregularities transferred to the urethane coat layer 2 side are reduced and relaxed. What is necessary is just to have the flexibility and the softness | flexibility which can provide sufficient flatness to the urethane coat layer 4 side of the base sheet 1, Polyolefin resin foam sheets, such as polyethylene, Polyester resin foam sheets, Polystyrene resins A foam sheet, a polyurethane resin foam sheet, or the like can be used. These foamed sheets are preferably non-crosslinked, but may be chemically crosslinked or electronically crosslinked. Among these, a non-crosslinked polyethylene foam sheet is preferable because it is excellent in flexibility and cushioning properties and is excellent in waterproofness.

  The thickness of the synthetic resin foam sheet layer 2 is preferably in the range of 0.5 to 5 mm, and more preferably in the range of 0.8 to 2.0 mm. If the thickness of the synthetic resin foamed sheet layer 2 is less than 0.5 mm, there is a possibility that the step or unevenness mitigating action of the synthetic resin foamed sheet cannot be obtained sufficiently.

  The metal layer 3 and the synthetic resin foam sheet layer 2 are preferably bonded together by an adhesive. The adhesive is not particularly limited as long as the metal layer 3 and the synthetic resin foam sheet layer 2 can be firmly bonded, and an aluminum foil is used as the metal layer 3 and a polyethylene foam sheet is used as the synthetic resin foam sheet layer 2. When used, an adhesive containing a polyethylene component (LDPE) is preferred. The application thickness of this adhesive is preferably in the range of 5 to 70 μm, more preferably in the range of 10 to 30 μm.

When the waterproof base sheet 1 is bonded to the surface of the heat insulating material 5 coated on the inner surface of the heat storage tank, even if there are steps or irregularities on the surface of the heat insulating material 5, sufficient flatness is provided on the urethane coat layer 4 side. The tensile force resulting from the said level | step difference and unevenness | corrugation can be reduced in the waterproof layer provided on it. The effect of this waterproof base sheet 1 is demonstrated with reference to FIG.
FIG. 2 is a perspective view showing a case where the waterproof base sheet 1 is joined to the surface of the heat insulating material 5 having the step 6. As illustrated in FIG. 2, when the synthetic resin foam sheet layer 2 side of the waterproof base sheet 1 is joined to the surface of the heat insulating material 5 having the step 6, the synthetic resin foam sheet layer 2 follows the step on the surface of the heat insulating material 5. The step which is deformed and transferred to the urethane coat layer 4 side is reduced and relaxed. As a result, sufficient flatness is imparted to the urethane coat layer 4 side of the waterproof base sheet 1. In particular, even if the step on the surface of the heat insulating material 5 is angular, the step is rounded even when the step is transferred to the urethane coat layer 4 side by filling the corner with the synthetic resin foam sheet layer 2 and filling it. Smooth and small steps. Therefore, in a state where the waterproof base sheet 1 is bonded to the surface of the heat insulating material 5, the urethane coat layer 4 side is flat, and when the waterproof layer is provided on the urethane coat layer 4, it is caused by transferred steps or irregularities. A local tensile force or the like is less applied to the waterproof layer, and deterioration of the waterproof layer can be prevented.

  In the waterproof base sheet 1, it is desirable to provide a resin film layer between the metal layer 3 and the urethane coat layer 4. Examples of this resin film layer include polyester films such as polyethylene terephthalate (PET), polyolefin films such as polyethylene and polypropylene, various resin films such as polyamide films and polystyrene films, among which polyester films such as PET are preferable. The thickness of this resin film is preferably in the range of 5 to 25 μm, more preferably in the range of 10 to 15 μm.

In the case where the resin film layer is provided between the metal layer 3 and the urethane coat layer 4, it is desirable that the interlayer between the resin film layer and the metal layer 3 is adhered to the entire surface with an adhesive. The adhesive is not particularly limited as long as the metal layer 3 and the resin film layer can be firmly bonded, but when the aluminum foil is used as the metal layer 3 and the PET film is used as the synthetic resin foam sheet layer 2 An adhesive containing a polyethylene component (LDPE) is preferred. The application thickness of this adhesive is preferably in the range of 5 to 70 μm, more preferably in the range of 10 to 30 μm.
Moreover, it is desirable that the urethane coat layer 4 is directly applied on the resin film layer.

  In this waterproof base sheet 1, an adhesive layer for bonding the waterproof base sheet 1 to the surface of the heat insulating material 5 is laminated on the lower surface side of the synthetic resin foam sheet layer 2 (the surface opposite to the urethane coat layer 4). Further, it is preferable to attach a release paper to the adhesive layer. As this adhesive layer, it is desirable to use an adhesive or a pressure-sensitive adhesive that has a heat resistant performance that firmly bonds the synthetic resin foam sheet layer 2 and the surface of the heat insulating material 5 and does not deteriorate the adhesive performance even at least at 60 ° C. Furthermore, since the heat storage tank can be used both when storing hot water at about 60 ° C. and when storing cold water at about 0 ° C., the adhesive / adhesive used for the adhesive layer is bonded at room temperature. -It is desirable to use a material that does not show a decrease in adhesion / adhesion performance at 60 ° C. and 0 ° C. compared to the adhesion performance. As such an adhesive / pressure-sensitive adhesive, for example, an acrylic resin-based pressure-sensitive adhesive can be mentioned.

The waterproof base sheet 1 according to the present invention provides a waterproof base by bonding the opposite surface of the urethane base layer 4 of the waterproof base sheet 1 to the surface of the heat insulating material 5 coated on the inner surface of the heat storage tank. This is suitably used in a waterproofing method in which a waterproof layer is provided on the urethane coat layer 4 and the surface of the heat insulating material 5 is waterproofed, and a waterproof structure obtained thereby. As a waterproof layer provided on the urethane coat layer 4, trade names “Cosmic RIM S-100”, “Cosmic RIM S-200”, “Cosmic RIM 1000GS”, “Cosmic RIM A-50R” manufactured by Uplex, etc. The ultrafast curing polyurethane waterproofing material and polyurea waterproofing material are preferable in terms of sprayability and curability on the ceiling, wall surface and floor surface.
Moreover, as the heat insulating material 5, the polystyrene-type resin foaming molded object of foaming magnification 5 times-80 times is preferable.

[Example 1]
From the uppermost layer to the lowermost layer of the waterproof base sheet 10 shown in FIG. 3, urethane coat 11 (urethane coat layer), PET film 12 (resin film layer), LDPE 13 (adhesive), aluminum foil 14 (metal layer 3) , LDPE15 (adhesive), EPE sheet 16 (synthetic resin foam sheet 2), acrylic resin adhesive 17 (adhesive layer), and release paper 18 are laminated in order, and the waterproof base sheet of the embodiment according to the present invention 10 was produced. Details of each layer are as follows.

-Urethane coat 11 (urethane coat layer): The product name "Hilamic" manufactured by Dainichi Seika Kogyo Co., Ltd. was applied to the surface of the PET film 12 with a coating amount of 0.2 g / m ² by wet lamination and cured.
PET film 12 (resin film layer): trade name “Polyester film FE2002A” manufactured by Futamura Chemical Co., Ltd., thickness 11 μm.
LDPE13 (adhesive): manufactured by Nippon Polyethylene Co., Ltd., trade name “LC600A”, thickness 15 μm.
Aluminum foil 14 (metal layer 3): trade name “aluminum foil IN30” manufactured by Toyo Aluminum Co., Ltd., thickness 7 μm.
LDPE15 (adhesive): manufactured by Tosoh Corporation, trade name “Tetrocene # 212”, thickness 15 μm.
EPE sheet 16 (synthetic resin foam sheet 2): Non-crosslinked polyethylene foam sheet manufactured by Sekisui Plastics Co., Ltd., trade name “Lightlon S”, thickness 1 mm.
Acrylic resin-based adhesive 17 (adhesive layer): two-component cross-linked acrylic pressure-sensitive adhesive manufactured by Showa Polymer Co., Ltd., trade name “Vinylol PSA SV-6460”, coating thickness 20 μm.
Release paper 18: A kraft paper (thickness 80 μm) laminated with polyethylene (thickness 15 μm).

[Comparative Example 1]
A waterproof base sheet was produced in the same manner as in Example 1 except that the EPE sheet 16 was omitted.

<Comparison test>
As a heat insulating material, Sekisui Plastics Industry Co., Ltd. underground heat storage tank mold and heat insulating material, product name "Kataemon", on the predetermined surface, forming a square groove of width 100mm, depth 5mm, This was a step.
The release paper of the waterproof base sheet of Example 1 is removed, and the exposed acrylic resin adhesive 17 is overlapped on the surface of the heat insulating material so as to cover the step, and used for sheet rolling in sheet waterproofing work. The rubber roller was joined and integrated. Thereafter, the dimension of the step transferred to the urethane coat layer side of the waterproof base sheet was measured and compared with the dimension of the groove formed in the heat insulating material.
Similarly to the sheet of Example 1, the waterproof base sheet of Comparative Example 1 was overlapped and joined and integrated so as to cover the step provided in the heat insulating material.

(result)
In the waterproof base sheet of Example 1, the level difference transferred to the urethane coat layer side became small, particularly the corners were rounded, and flatness enough to provide the waterproof layer without problems could be secured.
On the other hand, in the waterproof base sheet of Comparative Example 1, the level difference transferred to the urethane coat layer side was not significantly different from the size of the original square groove, and the urethane coat layer side was not flat.

The present invention relates to a waterproof base sheet used for a waterproof structure of a heat storage tank, a waterproof structure using the waterproof base sheet, and a waterproof construction method.
The waterproof base sheet of the present invention can provide a waterproof layer on a flat surface by relaxing steps and irregularities on the surface of the heat insulating material.

  DESCRIPTION OF SYMBOLS 1 ... Waterproof base sheet, 2 ... Synthetic resin foam sheet layer, 3 ... Metal layer, 4 ... Urethane coat layer, 5 ... Heat insulating material, 6 ... Level difference, 10 ... Waterproof base sheet, 11 ... Urethane coat (urethane coat layer), DESCRIPTION OF SYMBOLS 12 ... PET film (resin film layer), 13 ... LDPE (adhesive), 14 ... Aluminum foil (metal layer), 15 ... LDPE (adhesive), 16 ... EPE sheet (synthetic resin foam sheet), 17 ... Acrylic resin Adhesive (adhesive layer), 18 ... release paper.

Claims (9)

A waterproof base sheet joined to the surface of the heat insulating material coated on the inner surface of the heat storage tank,
It has a metal layer, a urethane coat layer laminated on one surface side of the metal layer, and a flexible synthetic resin foam sheet layer laminated on the other surface side of the metal layer. Waterproof base sheet.   2. The waterproof base sheet according to claim 1, wherein the urethane coat layer satisfies a performance of a peel strength specified in JIS Z0238 of 30 to 500 g / 15 mm width and a seal strength of 1.0 to 5.5 kg / 15 mm width. .   The waterproof base sheet according to claim 1 or 2, wherein the synthetic resin foam sheet is a thermoplastic resin foam sheet having a thickness of 0.5 to 5 mm.   The waterproof base sheet according to claim 1, wherein the metal layer is made of an aluminum foil having a thickness of 4 to 30 μm.   The waterproof base sheet according to any one of claims 1 to 4, wherein a resin film layer is provided between the metal layer and the urethane coat layer.   The waterproof base sheet according to any one of claims 1 to 5, wherein an adhesive layer is laminated on the surface of the synthetic resin foam sheet layer opposite to the metal layer.   The waterproof base sheet according to claim 6, wherein a release paper is attached to a surface of the adhesive layer opposite to the synthetic resin foam sheet layer. A waterproof structure applied to the surface of the heat insulating material coated on the inner surface of the heat storage tank,
The waterproof base | substrate which joined the surface opposite to the said urethane-coat layer of the waterproof base sheet of any one of Claims 1-7 is provided in the surface of the said heat insulating material, On the said urethane-coat layer of this waterproof base | substrate A waterproof structure having a structure provided with a waterproof layer. A waterproofing method for waterproofing the surface of the heat insulating material coated on the inner surface of the heat storage tank,
A waterproof base is provided on the surface of the heat insulating material by bonding the opposite surface of the waterproof base sheet of the waterproof base sheet according to any one of claims 1 to 7, and then on the urethane base layer of the waterproof base. A waterproofing method characterized by providing a waterproof layer on the surface.

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