JP2020165282A - Skin sheet for roofing sheet and roofing sheet with skin sheet - Google Patents

Abstract

To provide a skin sheet for a roofing sheet which is light-weight and has a superior durability and can improve design as well.SOLUTION: The skin sheet 11 comprises a resin film 1 and a fiber sheet 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a roofing sheet for a roofing sheet and a roofing sheet with a roofing sheet.

Asphalt roofing sheets are used on roofs such as rooftops to provide waterproofness.
Various types of asphalt roofing sheets are known, but asphalt roofing sheets in which a base material such as paper or chemical fiber non-woven fabric is impregnated with asphalt and coated are mainly used. As asphalt, it is said that it is preferable to use modified asphalt from the viewpoint of durability.
For example, Patent Document 1 describes sheet-shaped modified asphalt roofing in which a modified asphalt layer is laminated on a base material layer and a sand grain layer is provided on the modified asphalt layer. In Patent Document 1, a sand grain layer is provided on the surface of the modified asphalt layer in order to prevent deterioration of the modified asphalt layer and improve durability.

JP-A-11-336266A

However, the above-mentioned prior art has the following problems.
In asphalt roofing sheets and modified asphalt roofing sheets, especially exposed waterproof roofings used for flat roofs are directly exposed to sunlight, rain, wind, snow, etc., and therefore, higher durability is required. On the other hand, roofing for exposed waterproofing is easily noticed by people, so improvement in design is also required.
In the technique described in Patent Document 1, durability is improved by providing a sand grain layer in which mineral particles are densely provided on the surface. Therefore, there is a problem that the dark sand grain layer is exposed on the surface and the designability cannot be improved.
It is also conceivable to apply a weather resistant resin to the surface of the sand grain layer to improve the design of the weather resistant resin. However, the mineral particles used in the sand grain layer are made of, for example, straight chips or crushed stone, and have a particle size of about 1500 μm. Since such mineral particles have a large specific gravity, the roofing sheet becomes heavy, and there is a problem that it is difficult to handle when carrying or constructing.
Furthermore, in recent years, the surface temperature of roofing sheets has been on the rise due to the effects of climate change. Due to this effect, there is also a problem that defects such as cracks, sand fall, and mud curling phenomenon are likely to occur on the surface layer of the roofing for exposure waterproofing.
The mud curling phenomenon is a roofing sheet for exposed waterproofing, in which deposits of mud and pollen accumulated in the water pool are repeatedly dried and wet, and the volume shrinks during drying, causing the deposits to bite into the surface layer and roofing. It is a phenomenon of turning up the surface. If there is a sand grain layer on the surface of the roofing sheet for exposed waterproofing, it is considered that the mud curling phenomenon is likely to occur because the deposits easily bite into the sand grains.
Defects such as mud curling also reduce the design.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a roofing sheet skin sheet and a roofing sheet with a skin sheet, which are lightweight, have excellent durability, and can improve design. ..

In order to solve the above problems, the present invention includes the following aspects.
[1] A skin sheet for a roofing sheet containing a resin film and a fiber sheet.
[2] The skin sheet for roofing sheet according to [1], wherein the fiber sheet is a non-woven fabric.
[3] The skin sheet for roofing sheet according to [1] or [2], wherein the material of the fiber sheet contains polypropylene.
[4] The skin sheet for roofing sheet according to any one of [1] to [3], which has a thickness of 50 μm or more and 5000 μm or less.
[5] The skin sheet for roofing sheet according to any one of [1] to [4], which has a basis weight of 200 g / m ² or less.
[6] The roofing according to any one of [1] to [5], wherein the water resistance measured by the JIS L1092 water pressure resistance test (hydrostatic pressure method) A method (low water pressure method) is 2000 mmH ₂ O or more. Skin sheet for seats.
[7] The skin sheet for roofing sheet according to any one of [1] to [6], wherein the resin film is laminated on one side of the fiber sheet and has a thickness of 5 μm or more and 500 μm or less.
[8] The skin sheet for roofing sheet according to any one of [1] to [7], wherein the heat resistant temperature of the resin film is 180 ° C. or higher.
[9] The skin sheet for roofing sheet according to any one of [1] to [8], wherein the material of the resin film contains a polycarbonate-based urethane resin.
[10] The skin sheet for roofing sheet according to any one of [1] to [9], wherein the solar reflectance in the near infrared region measured according to JIS K5602 is 40% or more.
[11] The skin sheet for roofing sheet according to [10], wherein a heat ray reflecting layer containing a heat ray reflecting substance is further applied to at least a part of the surface of the resin film.
[12] A roofing sheet with a skin sheet comprising the asphalt layer and the roofing sheet skin sheet according to any one of [1] to [11] laminated on the asphalt layer.
[13] The roofing sheet with a skin sheet according to [12], which has a thickness of 1.5 mm or more and 5.0 mm or less.
[14] weight per unit area, 1500 g / ^{m 2} or more and 5500 g / ^{m 2} or less, the skin sheet laminated roofing sheet according to [12] or [13].
[15] The roofing sheet with a skin sheet according to any one of [12] to [14], wherein a core material made of non-woven fabric is arranged in the asphalt layer.
[16] the basis weight of the core material ^is a ^{50g / m 2 ~200g / m 2} , [15] the skin sheet laminated roofing sheet according.
[17] The roofing sheet with a skin sheet according to [15] or [16], wherein the core material contains a fiber material composed of at least one of a polymer-based chemical fiber material and a glass fiber material.
[18] The roofing sheet with a skin sheet according to any one of [15] to [17], wherein the core material is impregnated with asphalt for permeation composed of at least one of modified asphalt and blown asphalt.
[19] The asphalt layer has a structure in which coating asphalt is laminated on the core material, and the coating asphalt is composed of at least one of modified asphalt and three types of asphalt for waterproofing work. The roofing sheet with a skin sheet according to any one of [15] to [18].
[20] The item according to any one of [12] to [19], wherein the pyroclastic material adheres to the surface of the asphalt layer on the opposite side of the roofing sheet skin sheet to which the roofing sheet is laminated. Roofing sheet with skin sheet.
[21] Any of [12] to [19], wherein the adhesive layer and the peelable protective film are laminated in this order on the surface of the asphalt layer opposite to the roofing sheet skin sheet to which the roofing sheet is laminated. Roofing sheet with skin sheet according to item 1.
[22] On the surface of the asphalt layer on the opposite side of the roofing sheet skin sheet to which the roofing sheet is laminated, a mineral fines and an adhesive layer formed in an island shape or a band shape are arranged. The roofing sheet with an epidermis sheet according to any one of [12] to [19], further comprising a peelable protective film laminated on the adhesive layer so as to cover the mineral fines and the adhesive layer.

The roofing sheet for roofing sheet and the roofing sheet with a roofing sheet of the present invention are lightweight, have excellent durability, and can improve the design.

It is a schematic vertical sectional view which shows an example of the roofing sheet with the skin sheet of 1st Embodiment of this invention. It is a schematic vertical sectional view which shows an example of the roofing sheet with the skin sheet of the 2nd Embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line AA in FIG. It is a schematic vertical sectional view which shows an example of the roofing sheet with the skin sheet of the 3rd Embodiment of this invention. It is a schematic perspective view which shows the test piece in the adhesive strength test. It is a schematic front view which shows the test apparatus used for the adhesive strength test.

Hereinafter, the roofing sheet roofing sheet and the roofing sheet with the roofing sheet according to the embodiment of the present invention will be described with reference to the accompanying drawings. In all the drawings, even if the embodiments are different, the same or corresponding members are designated by the same reference numerals, and common description will be omitted.

[First Embodiment]
The roofing sheet for the roofing sheet and the roofing sheet with the roofing sheet according to the first embodiment of the present invention will be described.
FIG. 1 is a schematic vertical sectional view showing an example of a roofing sheet with a skin sheet according to the first embodiment of the present invention.

As shown in FIG. 1, the roofing sheet 10 (roofing sheet with skin sheet) of the present embodiment includes the skin sheet 11 (skin sheet for roofing sheet), the asphalt layer 12, and the adhesive layer 5 (adhesive layer) of the present embodiment. , And a sheet-like laminated body including the peelable protective film 6.
The skin sheet 11, the asphalt layer 12, the adhesive layer 5, and the peelable protective film 6 are arranged in this order in the layer thickness direction (vertical direction in the drawing) of the roofing sheet 10. The skin sheet 11, the asphalt layer 12, and the adhesive layer 5 constitute the roofing sheet main body 10A.

The roofing sheet 10 is attached to the construction portion by attaching the adhesive layer 5 to the surface of the construction portion such as a roof after the peelable protective film 6 is peeled off. Therefore, of the roofing sheets 10, only the roofing sheet main body 10A is arranged in the construction section.
The roofing sheet 10 can be used for both flat roofs and sloping roofs. As will be described later, the roofing sheet 10 is more preferably used for a flat roof because it has excellent waterproofness and durability. The roofing sheet 10 imparts waterproofness to the construction portion, and can be used for both exposed waterproofing and non-exposed waterproofing.
The shape of the roofing sheet 10 is, for example, a long strip. The roofing sheet 10 may be rolled in the longitudinal direction.
FIG. 1 shows a part of a cross section of the roofing sheet 10 along the longitudinal direction. The roofing sheet 10 has a cross section similar to that in FIG. 1 even in the lateral direction.

<Skin sheet for roofing sheet>
The skin sheet 11 is arranged (laminated) on the surface of the asphalt layer 12 on the opposite side of the peelable protective film 6 in the roofing sheet 10. Therefore, the skin sheet 11 constitutes the surface portion of the roofing sheet 10 in the manner in which the roofing sheet 10 is attached to the roof.
The thickness of the skin sheet 11 is not particularly limited as long as the durability required for the roofing sheet 10 at the time of attachment can be obtained. For example, the thickness of the skin sheet 11 may be 50 μm or more and 5000 μm or less.
When the thickness is 50 μm or more, the skin sheet 11 becomes self-supporting and can be easily handled in the step of laminating on the asphalt layer 12 described later. Further, when the thickness is 50 μm or more, the durability of the roofing sheet 10 becomes good.
When the thickness is 5000 μm or less, the weight is lighter than when the thickness is further thick, so that the roofing sheet 10 can be easily handled.
The thickness of the skin sheet 11 is more preferably 100 μm or more, and further preferably 150 μm or more, in that the durability can be further improved.

The basis weight of the skin sheet 11 is not particularly limited as long as the durability required for the roofing sheet 10 can be obtained. For example, the basis weight of the skin sheet 11 may be 10 g / m ² or more and 200 g / m ² or less.
When the basis weight is 10 g / m ² or more, the durability and strength are good. As a result, deterioration of design due to deterioration over time is suppressed.
When the basis weight is 200 g / m ² or less, the weight is lighter than when the basis weight is larger, so that the roofing sheet 10 can be easily handled.
The basis weight of the skin sheet 11 is more preferably 150 g / m ² or less, and further preferably 100 g / m ² or less, in that it can be made lighter.

Epidermal sheet 11, from the viewpoint of waterproof property, it is more preferable water resistance measured at JIS L1092 water resistance test (hydrostatic method) A method (low water pressure method) is 2000mmH ₂ O or more.

From the viewpoint of weather resistance, the skin sheet 11 preferably has a solar reflectance in the near infrared region of 40% or more, more preferably 50% or more, and more preferably 60% or more, as measured according to JIS K5602. Is particularly preferred.

In the example shown in FIG. 1, the skin sheet 11 includes a resin film 1 and a fiber sheet 2. In the example shown in FIG. 1, the resin film 1 constitutes the outermost surface of the skin sheet 11, but the skin sheet 11 is provided with a heat ray reflecting material containing a heat ray reflecting substance described later on the resin film 1. It does not have to form the outermost surface of.

<Resin film>
The resin film 1 is a resin layer that covers the entire surface of at least one surface of the fiber sheet 2 described later.
In the example shown in FIG. 1, the resin film 1 covers one side of the fiber sheet 2. Specifically, the resin film 1 covers the entire surface of the fiber sheet 2 on the opposite side of the asphalt layer 12.
However, the resin film 1 may cover both surfaces of the fiber sheet 2 in the layer thickness direction.

The thickness of the resin film 1 is not particularly limited as long as the strength and thickness required for the skin sheet 11 can be obtained together with the fiber sheet 2 described later.
Here, the thickness of the resin film 1 refers to the thickness of the layered portion formed on the outside of the fiber sheet 2 by the material of the resin film 1. Of the material of the resin film 1, the thickness of the portion impregnated in the fiber sheet 2 is excluded.
For example, the thickness of the resin film 1 may be measured by observing the cross section of the skin sheet 11 with an electron microscope. In this case, it is preferable to measure the thickness of the resin formed on the fiber sheet 2 at any five points and use the average value thereof.

For example, the thickness of the resin film 1 may be 5 μm or more and 500 μm or less.
When the thickness is 5 μm or more, for example, more coloring material can be easily dispersed in the resin film 1, so that the resin film 1 can be easily colored in an appropriate color. As a result, the design of the skin sheet 11 and the roofing sheet 10 is improved.
Further, since the weather resistance of the resin film 1 is improved, the durability and surface strength of the skin sheet 11 and the roofing sheet 10 are improved.
When the thickness is 500 μm or less, the thickness occupied by the fiber sheet 2 described later in the skin sheet 11 can be increased, so that the durability and heat resistance of the skin sheet 11 can be improved depending on the type of the fiber sheet 2 described later. ..
Further, when the thickness is 500 μm or less, the weight of the skin sheet 11 can be reduced as compared with the case where the thickness exceeds 500 μm.
The thickness of the resin film 1 is more preferably 10 μm or more, and further preferably 20 μm or more. The thickness of the resin film 1 is more preferably 100 μm or less, and further preferably 50 μm or less.

The material of the resin film 1 is more preferably a flexible resin material.
Examples of resin materials suitable for the resin film 1 include polyester resins such as polyethylene terephthalate and polyethylene naphthalate, polyamide resins such as nylon, polyolefin resins such as polypropylene, polyvinyl chloride resins, polyvinyl alcohol resins, urethane resins, and polycarbonate resins. Such as a single substance or a complex of two or more kinds can be mentioned. When the resin film 1 is made of a composite of a plurality of types of resin materials, it may be a composite made of a polymer alloy, a composite formed by kneading, or a composite having a laminated structure.
From the viewpoint of heat resistance and durability, it is more preferable that the material of the resin film 1 contains a polycarbonate resin. From the viewpoint of flexibility and elasticity, it is more preferable that the material of the resin film 1 contains a urethane resin. It is particularly preferable that a polycarbonate urethane resin is used as the material of the resin film 1.
Further, the resin may be subjected to a modification treatment such as a silicon modification or a cross-linking reaction by adding a cross-linking agent in order to improve antifouling property, rework property, solvent resistance, heat resistance and the like.

The material of the resin film 1 is more preferably a material having high heat resistance.
The "heat resistance" in the present specification is represented by the "heat resistance temperature" measured by the measurement method described below.
As the measuring device, an NM-1 type anti-fusion tester (trade name; manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.) is used. As the sample, a strip-shaped measurement sample having a width of 5 cm or more, which is made of the material of the resin film 1, is prepared.
After setting the metal core material (diameter 7 mm) for testing in the anti-fusion tester to 150 ° C., hold the sample lightly by hand so that the sample does not deviate from the core material, and hold the core material on the resin film surface of the sample. For 5 seconds. Check if a through hole is generated due to melting of the sample, and if no through hole is generated, continue to raise the temperature of the core material by 10 ° C and perform the same operation at a place different from the previous one of the sample. repeat. The temperature at the time of the test immediately before the temperature at which the through hole is generated in the sample is defined as the heat resistant temperature.

For example, the material of the resin film 1 may have a heat resistant temperature of 180 ° C. or higher.
When the heat-resistant temperature is 180 ° C. or higher, it is possible to prevent holes due to heating when the skin sheet 11 and the asphalt layer 12 described later are laminated.
The higher the heat resistant temperature is, the more preferable it is. Therefore, the upper limit of the heat resistant temperature is not particularly limited, but may be, for example, about 300 ° C.
The heat resistant temperature of the resin film 1 is more preferably 200 ° C. or higher, and even more preferably 220 ° C. or higher.

The resin film 1 may contain various additives in addition to the above-mentioned resin material.
For example, in order to impart designability to the roofing sheet 10, a coloring material such as a pigment, a light-storing material, a material having an optical action such as reflection, retroreflection, and scattering of glass beads and the like are added to the resin film 1. You may. Thereby, for example, the design of the skin sheet 11 and the roofing sheet 10 can be improved by coloring and emitting light of the skin sheet 11, changing the reflection brightness of the skin sheet 11, and imparting retroreflective property.

In FIG. 1, the layer thickness of the resin film 1 is drawn to be constant, which is an example. An uneven shape may be formed on the surface of the resin film 1. The uneven shape can be formed, for example, by using a paper pattern having an appropriate uneven pattern or using an embossed roll at the time of manufacturing the resin film 1.
By appropriately selecting a pattern, a pattern, or the like having an uneven shape, it is possible to impart a surface feeling, a pattern, or the like rich in design to the surface of the skin sheet 11. Thereby, the design of the skin sheet 11 and the roofing sheet 10 can be improved.

Examples of other additives that can be added to the resin film 1 include inorganic oxides such as titanium oxide, hollow particles such as ceramic balloons, heat ray reflecting substances such as aluminum and antimony-doped tin, titanium oxide photocatalysts, zinc oxide and the like. Examples thereof include various antibacterial agents, deodorants, antifouling agents, smoothing agents, anti-slip materials, flame retardants, antioxidants, and ultraviolet absorbers.

Although not particularly shown, it is preferable to provide a heat ray reflecting layer containing an appropriate heat ray reflecting substance on the surface of the resin film 1.
The asphalt layer of the conventional roofing sheet has a drawback that the temperature rises by absorbing heat rays, causing cracks and deterioration due to thermal expansion and contraction of the asphalt layer. In order to alleviate this defect, conventionally, after installing the roofing sheet on the rooftop or the like, the heat ray reflective paint is manually applied on the roofing sheet.
However, by using a skin sheet having a heat ray reflecting substance containing a heat ray reflecting substance on at least a part of the surface of the resin film 1, the skin sheet reflects infrared rays in sunlight and is laminated on the lower layer of the skin sheet. It is possible to obtain a roofing sheet in which the above-mentioned drawbacks are alleviated by alleviating the temperature rise of the asphalt layer.
Since the roofing sheet with a skin sheet is provided with a heat ray reflective layer in advance on the skin sheet by using a manufacturing facility, it is possible to omit the manual coating process of the paint, which has the effect of reducing labor and improving productivity. ..

The above can be used as the heat ray reflecting material, but when a brilliant metal is used, the reflected light of visible light is dazzling and causes light damage to the neighborhood, so titanium oxide having a relatively low brilliance Inorganic oxides such as, ceramic balloons, silas balloons, hollow beads of silica and acrylic, antimony-doped tin and the like are preferably used.

As a material for forming the heat ray reflecting layer, a material in which the above heat ray reflecting substance is dispersed in a binder resin is preferably used. As the binder resin, acrylic silicone resin, fluororesin, acrylic fluororesin, acrylic urethane resin and the like are preferable.

The heat ray reflecting layer is applied to an arbitrary pattern such as a solid pattern on the entire surface of the resin film 1, a lattice pattern, a dot pattern, a checkered pattern, a hexagonal pattern, a linear pattern, or an arbitrary design. Specifically, it may be applied onto the surface of the resin film 1 by an appropriate application method including coating, ejection, transfer, printing, deposition, and the like.
The amount to be applied is preferably 12 to 100 g / m ² . If it is 12 g / m ² or more, the effect of protecting the asphalt layer from heat rays can be sufficiently exerted. If it is 100 g / m ² or less, the occurrence of mud curling of the heat ray reflecting layer can be suppressed, and the skin sheet 11 can be made lighter and thinner.

Although not particularly shown, a printing layer using an appropriate ink may be provided on the surface of the resin film 1. The pattern on the print layer is not particularly limited.
The method for forming the print layer is not particularly limited. For example, the print layer may be formed by appropriate printing including application, ejection, transfer, lamination, deposition, etc. of ink.
By providing the printing layer on the resin film 1, the design of the skin sheet 11 and the roofing sheet 10 can be further improved.
Further, the heat ray reflecting substance may be added to the printing layer, or the printing layer may be laminated on the heat ray reflecting layer.

The method for forming the resin film 1 described above is not particularly limited. For example, the resin film 1 may be formed by joining a resin film to the surface of the fiber sheet 2 described later. For example, the resin film 1 may be formed by coating or depositing a resin material on the surface of the fiber sheet 2.

<Fiber sheet>
The fiber sheet 2 is a sheet-like member formed of an appropriate fiber that can be laminated with the resin film 1. For example, the fiber sheet 2 may be a woven fabric, a knitted fabric, a non-woven fabric or the like formed of appropriate fibers. From the viewpoint of manufacturing cost and good handling, the fiber sheet 2 is more preferably a non-woven fabric.
Examples of fibers suitable for the fiber sheet 2 include inorganic fibers, organic fibers, metal fibers, and composite fibers obtained by combining two or more of these fibers.
Specific examples of the inorganic fiber include carbon fiber, graphite fiber, silicon carbide fiber, alumina fiber, tungsten carbide fiber, boron fiber, glass fiber, basalt fiber and the like.
Specific examples of organic fibers include nylon, vinylon, poly (meth) acrylic acid ester, polypropylene, vinyl chloride, aramid, cellulose, polyamide, polyester, polyacetal, ultrahigh molecular weight polyethylene, polyarylate, and PBO (polyparaphenylene). Examples thereof include resin fibers such as benzoxazole), polyphenylene sulfide (PPS), polyimide, fluororesin, and polyvinyl alcohol (PVA).
Specific examples of the metal fiber include stainless steel fiber and iron fiber.

From the viewpoint of morphological stability against moisture such as water, heat resistance, strength, mass, cost and the like, it is more preferable to use polypropylene fiber for the fiber sheet 2. When polypropylene is used, the polypropylene is thermally melted during lamination with the asphalt layer 12 described later, so that the peel strength between the skin sheet 11 and the asphalt layer 12 is improved.

The thickness of the fiber sheet 2 is not particularly limited as long as it can form the strength and thickness required for the skin sheet 11 together with the resin film 1. For example, the thickness of the fiber sheet 2 may be 100 μm or more and 5000 μm or less.
The thickness of the fiber sheet 2 before processing is measured using, for example, a dial thickness gauge for measuring the thickness of woven fabrics, knitted fabrics, non-woven fabrics, and the like. For example, a measuring instrument such as a dial thickness gauge model H-30 (trade name; manufactured by Ozaki Seisakusho Co., Ltd.) is used. The same applies to the thickness of the core material described later.

The basis weight of the fiber sheet 2 is not particularly limited as long as the basis weight and strength required for the skin sheet 11 can be formed together with the resin film 1. It is more preferable that the basis weight of the fiber sheet 2 is such that the resin material of the resin film 1 can be impregnated and held inside.
For example, the basis weight of the fiber sheet 2 may be 10 g / m ² or more and 100 g / m ² or less.
When the basis weight is 10 g / m ² or more, when the resin film 1 is laminated on the fiber sheet 2, it is possible to prevent the resin impregnated in the fibers of the fiber sheet 2 from penetrating into the back surface of the fiber sheet 2. When the basis weight is 100 g / m ² or less, the skin sheet 11 and the roofing sheet 10 can be made lighter and thinner.

<Asphalt layer>
As shown in FIG. 1, the asphalt layer 12 in the present embodiment includes an upper layer portion 3A, a core material portion 4, and a lower layer portion 3B in this order in the layer thickness direction from the skin sheet 11 to the pressure-sensitive adhesive layer 5. However, the asphalt layer 12 shown in FIG. 1 is an example. As the asphalt layer 12, for example, a known appropriate structure used for a modified asphalt roofing sheet or the like may be used.

The core material portion 4 is a layered portion formed by impregnating a core material made of a synthetic fiber non-woven fabric with asphalt for permeation.
The thickness of the core material portion 4 is not particularly limited as long as the flexibility, waterproofness, and strength required for the asphalt layer 12 can be obtained. For example, the thickness of the core material portion 4 may be 0.3 mm or more and 0.9 mm or less.
If the thickness exceeds 0.9 mm, flexibility may be lost.
If the thickness is less than 0.3 mm, the waterproof property and strength may be insufficient.
The thickness of the core material portion 4 is more preferably 0.4 mm or more and 0.8 mm or less.

As the core material in the core material portion 4, a material that can obtain sufficient strength, elongation, and other performance as the roofing sheet 10 is selected. As the material of the core material, a chemical fiber material may be used, or a natural fiber material may be used. Further, as the material of the core material, an organic fiber material may be used, or an inorganic fiber material may be used. As the material of the core material, for example, a fiber material composed of at least one of a polymer-based chemical fiber material and a glass fiber material may be used. Examples of high molecular weight chemical fiber materials include polyester, vinylon, nylon and the like.
For example, as the core material, a non-woven fabric containing one or more fiber materials selected from the group consisting of polyester, vinylon, nylon, and glass may be used. That is, the core material may be a non-woven fabric formed of a single fiber material, or may be a non-woven fabric formed of a mixture of a plurality of fiber materials.
As the core material in the core material portion 4, it is more preferable to use a non-woven fabric using polyester.

The basis weight of the core material is not particularly limited as long as it can be impregnated with asphalt for penetration. For example, the basis weight of the core material may be 50 g / m ² or more and 200 g / m ² or less.
When the basis weight is 50 g / m ² or more, the excellent waterproofness and durability required for the core material portion 4 can be obtained by impregnating with asphalt for permeation.
When the basis weight is 200 g / m ² or less, the flexibility of the core material is improved, so that the roofing sheet 10 can maintain its suppleness. As a result, it is possible to suppress warpage of the seat edge during construction.
The basis weight of the core material is more preferably 70 g / m ² or more and 170 g / m ² or less.

Examples of the permeation asphalt in the core material portion 4 include modified asphalt using a modifying material such as SBS, SEBS, APAO, and APP, or blown asphalt specified in JIS K 2207 petroleum asphalt.

The upper layer portion 3A is made of asphalt for coating, and is a layered portion that adheres to the surface of the core material portion 4 facing the skin sheet 11. The fiber sheet 2 of the skin sheet 11 is laminated on the surface of the upper layer portion 3A opposite to the core material portion 4.
Examples of coating asphalt used for the upper layer 3A include modified asphalt using modifiers such as SBS, SEBS, APAO, and APP, or three types of asphalt for waterproofing work specified in JIS K 2207 Petroleum Asphalt. Can be mentioned.

The lower layer portion 3B is configured in the same manner as the upper layer portion 3A except that the core material portion 4 is in close contact with the surface opposite to the upper layer portion 3A.

The thickness of the asphalt layer 12 is not particularly limited as long as the flexibility, waterproofness, and strength required for the asphalt layer 12 can be obtained. For example, the thickness of the asphalt layer 12 may be 1.0 mm or more and 4.0 mm or less.
If the thickness exceeds 4.0 mm, flexibility may be lost.
If the thickness is less than 1.0 mm, the waterproof property and strength may be insufficient.
The thickness of the asphalt layer 12 is more preferably 1.5 mm or more and 3.0 mm or less.

With such a configuration, a core material made of non-woven fabric is arranged in the middle portion in the layer thickness direction inside the asphalt layer 12 including the above-mentioned coating asphalt and permeation asphalt.

<Adhesive layer>
The adhesive layer 5 is a layered portion made of an adhesive that fixes the roofing sheet main body 10A to a construction portion such as a roof.
The adhesive layer 5 is in close contact with the surface of the lower layer portion 3B opposite to the core material portion 4.
The adhesive layer 5 may be provided on a part of the surface of the lower layer portion 3B as long as the roofing sheet main body 10A can be fixed with the joining strength required for the construction portion. However, in the example shown in FIG. 1, the adhesive layer 5 is provided on the entire surface of the lower layer portion 3B.
The thickness of the adhesive layer 5 is not particularly limited as long as the required bonding strength can be obtained. For example, the thickness of the pressure-sensitive adhesive layer 5 may be 0.1 mm or more and 0.8 mm or less.

The material of the adhesive layer 5 is not particularly limited as long as it can be fixed to the construction portion. For example, examples of the adhesive layer 5 include synthetic rubber adhesives such as styrene-butadiene, butyl rubber, and recycled rubber, chloroprene adhesives, acrylic adhesives, nitrile adhesives, and asphalt adhesives. Can be mentioned.

<Removable protective film>
The peelable protective film 6 is a film member that covers the surface of the adhesive layer 5 in the roofing sheet 10. The material of the peelable protective film 6 is not particularly limited as long as it can be peelably adhered to the adhesive layer 5.
For example, examples of the material of the peelable protective film 6 include paper, polypropylene film, polyester film, polyethylene film, polyolefin film and the like.

<Roofing sheet with skin sheet>
Next, the configuration of the roofing sheet 10 as a whole will be described.
Basis weight of the roofing sheet 10, for example, 1500 g / ^{m 2} or more and more preferably 5500 g / ^{m 2} or less.
When the basis weight is 1500 g / m ² or more, excellent waterproofness and durability can be maintained.
When the basis weight is 5500 g / m ² or less, a conventional roofing sheet (hereinafter, simply referred to as a conventional roofing sheet) in which a layered portion (sand grain layer) in which mineral particles are densely provided is provided on the surface in order to improve durability. ), It is possible to reduce the burden during transportation and construction.
Basis weight of the roofing sheet 10, 2000 g / ^{m 2} or more, and more preferably 4500 g / ^{m 2} or less.

The thickness of the roofing sheet 10 is more preferably 1.5 mm or more and 5.0 mm or more, for example.
When the thickness is 1.5 mm or more, excellent waterproofness and durability can be maintained. When the thickness is 5.0 mm or less, the burden during transportation and construction can be reduced as compared with the conventional roofing sheet.
The thickness of the roofing sheet 10 is more preferably 2.0 mm or more and 4.0 mm or less.

<Manufacturing method of skin sheet for roofing sheet>
Next, an example of the method for manufacturing the skin sheet 11 described above will be described.
The skin sheet 11 is manufactured by laminating the resin film 1 and the fiber sheet 2 on each other.
For example, the skin sheet 11 may be manufactured by joining the resin film forming the resin film 1 and the fiber sheet 2 to each other in a stacked state (hereinafter, referred to as the first method).
For example, the skin sheet 11 may be manufactured by directly forming a layer of the material of the resin film 1 on the fiber sheet 2 (hereinafter, referred to as a second method).
In this way, when the resin film 1 is formed on one side of the fiber sheet 2 and the fiber sheet 2 is exposed on the surface opposite to the fiber sheet 2, the surface on which the fiber sheet 2 is exposed and the asphalt layer described later are obtained. There is an advantage that the bonding force between 12 and 12 is improved.
In order to form the resin film 1 on both surfaces of the fiber sheet 2, the above-mentioned first and second methods may be applied to the surface on the opposite side of the fiber sheet 2.

When the first method is used, it is more preferable that the resin film has at least two or more layers including a skin film forming the main body of the resin film 1 and a binder layer to be bonded to the fiber sheet 2. ..
The material of the skin film and the binder layer is not particularly limited as long as it is a resin material suitable for the resin film 1 described above. The material of the skin film and the binder layer may be made of the same type of resin or may be made of different types of resin.
It is particularly preferable to use a polycarbonate-based urethane resin as the material for the skin film and the binder layer.
From the viewpoint of the good texture of the surface of the resin film 1 and the peeling strength against the fiber sheet 2, it is possible to use a one-component urethane resin for the skin film and a two-component urethane resin for the binder layer. More preferred.

When the second method is used, the material of the resin film 1 is not particularly limited as long as it is a resin material suitable as the resin film 1 described above, but it is more preferable to use a polycarbonate-based polyurethane resin. In this case, from the viewpoint of good texture of the surface of the resin film 1, it is more preferable to use a one-component urethane resin as the material of the resin film 1.

Here, a specific example of the first method will be described.
First, the resin film used in the first method is manufactured.
For example, a resin solution for forming an epidermis film (hereinafter referred to as a resin solution for an epidermis film) is applied onto a release base material.
As the release base material, an appropriate release paper or release film having a flat or uneven shape is used depending on the surface properties required for the resin film 1.
As the resin solution for the skin film used, a solution obtained by dissolving and diluting the resin material for the skin film with an appropriate solvent is used. Appropriate additives such as cross-linking agents, catalysts, the above-mentioned pigments, deodorants, antibacterial agents, smoothing agents, flame retardants, ultraviolet absorbers, antioxidants and the like are added to this resin solution. Can be done.
The method for applying the resin solution for the skin film is not particularly limited, and for example, a knife coater, a bar coater, a rotary screen, or the like can be used.

After that, the resin solution for the epidermis film is dried or cured by performing heat treatment or irradiation with active energy rays as needed. However, from the viewpoint of productivity, it is more preferable that the resin is cured by removing the solvent by drying.
As a result, an epidermis film is formed.
The temperature in the drying step may be an appropriate temperature depending on the type of the solvent and the cross-linking agent used in the resin solution for the skin film. For example, when a urethane resin is used as the resin and methyl ethyl ketone is used as the solvent, it may be dried at about 70 ° C. to 130 ° C. for about 30 seconds to 5 minutes. When a cross-linking agent is used in combination, the heat treatment may be performed at about 140 ° C. to 200 ° C. for about 20 seconds to 5 minutes.

After that, a resin solution for forming the binder layer (hereinafter referred to as a resin solution for the binder layer) is applied onto the skin film formed on the release base material. As the coating method of the resin solution for the binder layer, the same coating method as the coating method of the resin solution for the skin film described above is used.
After that, the resin solution for the binder layer is dried if necessary. As a result, a resin film in which the skin film and the binder layer are laminated is formed.

After that, the fiber sheet 2 is superposed on the binder layer of the resin film, and the resin film and the fiber sheet 2 are joined by niping while heating as necessary. The resin of the binder layer penetrates between the fibers of the fiber sheet 2, so that the binder layer and the fiber sheet 2 are firmly bonded to each other.
After that, heat treatment, aging treatment, or the like may be performed, if necessary.
In this way, the skin sheet 11 according to the first method is manufactured.

Next, a specific example of the second method will be described.
In the second method, a resin solution for forming the resin film 1 (hereinafter referred to as a resin film resin solution) is applied directly onto the fiber sheet 2. As the resin solution for the resin film, the same solution as the resin solution for the skin film in the first method is used. The method for applying the resin solution for the resin film is the same as the application method in the first method.
As described above, by increasing the texture of the fiber sheet 2 within a range where the weight does not matter, the coated resin film resin solution is appropriately impregnated in the fiber sheet 2 and the resin film resin is appropriately impregnated. The solution can be prevented from penetrating the back surface side of the fiber sheet 2. As a result, the resin solution for the resin film forms a layered portion having an appropriate thickness on the coated surface of the fiber sheet 2.
However, if the basis weight cannot be made the required size, the fiber sheet 2 is calendared as necessary to prevent the resin solution for the resin film from penetrating the back surface side of the fiber sheet 2. , Oil repellent finish, etc. may be applied.

After that, the resin solution for the resin film is dried to remove the solvent. As the temperature in this drying step, the same temperature as in the drying step of the resin solution for skin film in the first method is used.
If necessary, polymerization by heating or irradiation with active energy rays, promotion of the cross-linking reaction, immersion in a coagulation liquid, or the like may be performed. However, from the viewpoint of productivity, it is more preferable that the resin is cured by removing the solvent by drying.
In this way, the skin sheet 11 is manufactured by curing the resin impregnated in the fiber sheet 2 and the resin forming the layered portion on the outside of the fiber sheet 2.

A heat ray reflecting layer containing a heat ray reflecting substance may be further applied to at least a part of the surface of the resin film 1.
When a heat ray reflecting substance dispersed in a binder resin is used, it is applied directly on the entire surface of the resin film 1 in a solid state using a knife coater, a bar coater, etc., and directly on the resin film 1 using a gravure coater. The resin dispersion is transferred, the pattern of the resin dispersion prepared on the release substrate is transferred onto the resin film 1, and an arbitrary design is printed on the resin film 1 by a rotary screen, inkjet, or the like. .. From the viewpoint of weather resistance, the heat ray reflecting layer preferably covers the entire surface of the resin film 1. After that, the heat ray reflecting layer is cured by performing heat treatment or irradiation with active energy rays as necessary, and the heat ray reflecting layer is formed on at least a part of the surface of the resin film 1.

<Manufacturing method of roofing sheet with skin sheet>
Next, the method for manufacturing the roofing sheet 10 described above will be described.
In order to manufacture the roofing sheet 10, first, the non-woven fabric as the core material is impregnated with asphalt for penetration. As a result, the core material portion 4 is formed.
After that, the asphalt for coating is uniformly applied to both surfaces of the core material portion 4 in the layer thickness direction. For example, a coater roll or an addiction roll is used for applying the asphalt for coating. In this way, the asphalt layer 12 is formed.
After that, the skin sheet 11 is attached to one surface of the asphalt layer 12. At this time, a release paper for wrapping may be attached to the surface of the skin sheet 11 opposite to the surface to be bonded to the asphalt layer 12 to protect the skin sheet 11.
The pressure-sensitive adhesive layer 5 is formed by applying the pressure-sensitive adhesive material to the surface of the asphalt layer 12 opposite to the surface on which the skin sheet 11 is bonded. As a method of applying the adhesive material, for example, a coater roll or the like may be used. After that, the peelable protective film 6 is attached to the surface of the adhesive layer 5.
However, either of the bonding of the skin sheet 11 and the formation of the adhesive layer 5 and the peelable protective film 6 may be performed first. The bonding of the skin sheet 11 and the formation of the pressure-sensitive adhesive layer 5 and the peelable protective film 6 may be performed in parallel.
In this way, the roofing sheet 10 of the present embodiment is manufactured.

Next, the actions of the skin sheet 11 and the roofing sheet 10 will be described.
As described above, the roofing sheet 10 is configured by laminating the skin sheet 11 on the asphalt layer 12.
By having the asphalt layer 12, the roofing sheet 10 is waterproof, and further has a higher waterproof ability by covering the skin sheet 11 having water pressure resistance. Since the asphalt layer 12 is covered with the skin sheet 11, the environmental load such as light, wind and rain that the asphalt layer 12 receives from the outside is reduced by the skin sheet 11. As a result, the durability of the asphalt layer 12 is improved, so that the durability of the roofing sheet 10 is improved.
Since the skin sheet 11 is composed of the resin film 1 and the fiber sheet 2, it is lighter than the sand grain layer in the conventional roofing sheet.
Since the skin sheet 11 has a structure in which the resin film 1 is laminated on the fiber sheet 2, it has durability according to the strength and weather resistance of the fiber sheet 2.
Further, the resin film 1 of the skin sheet 11 can be given an arbitrary color and pattern by, for example, adding an appropriate additive or forming a printing layer. Further, when the uneven shape is formed on the surface of the resin film 1, the uneven pattern can be imparted. Therefore, various design characteristics can be imparted to the skin sheet 11.
If products having various designs are prepared as the skin sheet 11, the roofing sheet 10 having different designs can be easily manufactured only by changing the skin sheet 11 to be attached to the asphalt layer 12. Therefore, the roofing sheet 10 having a design according to the customer's preference can be provided in a small lot. As a result, it becomes possible to reduce inventory risk and respond to customer requests at an early stage.

Since the roofing sheet 10 is provided with the skin sheet 11 which is lighter than the sand grain layer instead of the sand grain layer of the conventional roofing sheet, it is lightweight and excellent in durability.

As described above, according to the skin sheet 11 and the roofing sheet 10 of the present embodiment, it is possible to improve the design while being lightweight and excellent in durability.

[Second Embodiment]
Next, a roofing sheet with a skin sheet according to a second embodiment of the present invention will be described.
FIG. 2 is a schematic vertical sectional view showing an example of a roofing sheet with a skin sheet according to a second embodiment of the present invention. FIG. 3 is a cross-sectional view taken along the line AA in FIG.

As shown in FIGS. 2 and 3, the roofing sheet 20 (roofing sheet with skin sheet) of the present embodiment includes a roofing sheet main body 20A instead of the roofing sheet main body 10A in the roofing sheet 10 of the first embodiment. The roofing sheet main body 20A includes an adhesive material layer 25 (adhesive layer) and a crushed mineral substance 27 in place of the adhesive material layer 5 in the roofing sheet main body 10A.
Hereinafter, the points different from the first embodiment will be mainly described.

The pressure-sensitive adhesive layer 5 in the first embodiment is formed on the entire surface of the lower layer portion 3B, whereas the pressure-sensitive adhesive layer 25 in the present embodiment is provided on a part of the surface of the lower layer portion 3B. The point is different.
The range of formation of the adhesive layer 25 is not particularly limited as long as the joining strength required for the roofing sheet 20 can be obtained with respect to the construction portion.
In the examples shown in FIGS. 2 and 3, the adhesive layer 25 is formed in a plurality of islands that are separated from each other in the longitudinal direction and the lateral direction of the roofing sheet 20. The plan-view shape of the island-shaped adhesive layer 25 is not particularly limited. For example, the plan view shape of the island-shaped pressure-sensitive adhesive layer 25 may be rectangular, circular (dot-shaped), or the like.
The arrangement of the adhesive layer 25 may be, for example, a grid such as a rectangular lattice or a houndstooth, or an arrangement having no regularity.
Although not shown, the plan view shape of the pressure-sensitive adhesive layer 25 may be a strip shape separated from each other in the intersecting directions in the extending direction. Here, the "strip shape" means a shape having a substantially constant width and extending along a straight line or a curved line. The extending direction of the strip-shaped adhesive layer 25 may be the longitudinal direction of the roofing sheet 20 or the lateral direction. The extending direction of the strip-shaped adhesive layer 25 may be a direction that diagonally intersects the longitudinal direction of the roofing sheet 20 or may be radial. The arrangement interval of the strip-shaped adhesive layer 25 may or may not be constant.

The mineral crushed product 27 is provided to prevent stickiness of the coating asphalt on the back surface.
As the crushed mineral material 27, for example, silica sand, black sand obtained by subjecting silica sand to water repellent treatment with heavy oil or the like can be used.
The particle size of the crushed mineral material 27 is not particularly limited as long as it does not hinder the adhesion between the base and the lower layer portion 3B. For example, the particle size of the crushed mineral material 27 may be 50 μm to 500 μm.

The mineral crushed material 27 is fixed to the surface of the lower layer portion 3B at least in a state of being sprayed on the lower layer portion 3B exposed between the adhesive layer 25.
The spraying density of the crushed mineral material 27 is not particularly limited as long as a breathable gap can be formed between the base and the lower layer portion 3B. Since FIGS. 2 and 3 are schematic views, the mineral crushed materials 27 are drawn densely, but the mineral crushed materials 27 may be separated from each other.

In the roofing sheet 20 of the present embodiment, the adhesive material forming the adhesive material layer 25 is applied to a necessary plan view shape such as an island shape, and the mineral crushed material 27 is sprayed between the adhesive material layers 25. It can be manufactured in the same manner as in the first embodiment.
The order of coating the adhesive layer 25 and spraying the crushed mineral material 27 is not particularly limited. However, from the viewpoint of the risk of deterioration of the adhesive force due to soiling the adhesive material, it is more preferable to spray the crushed mineral substance 27 before applying the adhesive material.

According to the roofing sheet 20 of the present embodiment, since it has the same skin sheet 11 as that of the first embodiment, it is lightweight, excellent in durability, and can improve the design as in the first embodiment.
In particular, in the present embodiment, since the mineral crushed material 27 is sprayed on the surface of the lower layer portion 3B between the adhesive material layers 25, the lower layer portion 3B excluding the lower layer portion 3B covered with the adhesive material layer 25 and the base material are used. A crushed mineral substance 27 is interposed between them. As a result, a ventilation layer having a gap between the crushed mineral materials 27 or a gap between the crushed mineral material 27 and the base is formed between the pressure-sensitive adhesive layers 25 adjacent to each other.
Water vapor and the like due to moisture and the like from the base are dispersed in the ventilation layer and leak to the outside through the ventilation layer communicating with each other. Therefore, the swelling of the roofing sheet main body 20A after construction is suppressed as compared with the case where the entire base is covered with the adhesive layer. Thereby, the durability of the roofing sheet main body 20A can be further improved. Further, by suppressing the swelling, it is possible to prevent the roofing sheet main body 20A from being impaired in design.

[Third Embodiment]
Next, a roofing sheet with a skin sheet according to a third embodiment of the present invention will be described.
FIG. 4 is a schematic vertical sectional view showing an example of a roofing sheet with a skin sheet according to a third embodiment of the present invention.

As shown in FIG. 4, the roofing sheet 30 (roofing sheet with skin sheet) of the present embodiment replaces the adhesive layer 5 and the peelable protective film 6 in the roofing sheet 10 of the first embodiment, and crushes mineral substances. The thing 27 is provided.
Hereinafter, the points different from the first embodiment will be mainly described.

The mineral crushed product 27 in the present embodiment differs from the second embodiment only in the spraying range. The mineral crushed material 27 in the present embodiment is fixed to the surface of the lower layer portion 3B in a state of being sprayed on the entire surface of the lower layer portion 3B opposite to the core material portion 4.
The spray density of the mineral crushed material 27 in the present embodiment is the same as that in the second embodiment. However, when the surface of the lower layer portion 3B is exposed in the present embodiment, it is more preferable that the amount of exposure is such that the lower layer portion 3B and the skin sheet 11 do not stick to each other when the roofing sheet 30 is rolled. ..

The roofing sheet 30 of the present embodiment is manufactured in the same manner as the first embodiment except that the crushed mineral substance 27 is sprayed instead of the adhesive layer 5 and the peelable protective film 6 being bonded to the lower layer portion 3B. it can.
After the mineral crushed material 27 is sprayed, the asphalt layer 12 is cooled by, for example, a cooling roll. However, the cooling method of the asphalt layer 12 is not limited to this. For example, the asphalt layer 12 may be cooled by spraying mist.
When the lower layer 3B of the asphalt layer 12 is cooled, the mineral crushed material 27 is firmly fixed on the lower layer 3B.

Since the roofing sheet 30 of the present embodiment does not have an adhesive layer, it is attached to the construction portion by applying molten asphalt for waterproof construction during construction.

According to the roofing sheet 30 of the present embodiment, since it has the same skin sheet 11 as that of the first embodiment, it is lightweight, excellent in durability, and can improve the design as in the first embodiment.
In particular, in the present embodiment, since the mineral crushed material 27 is sprayed on the entire surface of the lower layer portion 3B, a ventilation layer is formed between the base and the lower layer portion 3B after the construction. Therefore, as in the second embodiment, the swelling of the roofing sheet 30 after construction is suppressed. As a result, the durability of the roofing sheet 30 can be further improved. Further, it is possible to prevent the roofing sheet 30 from being impaired in design due to the suppression of swelling.

Next, examples of the skin sheet 11 and the roofing sheet 10 of the first embodiment described above will be described together with comparative examples.
The following [Table 1] shows the configurations and evaluation results of Examples 1 to 6 and Comparative Examples 1 and 2.

[Example 1]
The skin sheet 11 and the roofing sheet 10 of Example 1 were manufactured as follows.
First, the skin sheet 11 of this example was produced by the first method.

<Resin solution for epidermis film>
In order to form the epidermis film constituting the main body of the resin film 1 of the epidermis sheet 11, a resin solution for the epidermis film having the following composition was prepared. The following "parts" all represent "mass parts".

One-component urethane resin solution (polycarbonate urethane resin, solid content 25%) 100 parts Toluene 30 parts DMF (N, N-dimethylformamide) 10 parts White pigment (titanium oxide) 10 parts

The resin solution for the skin film was applied onto the paper pattern using a pipe coater, and then dried at 110 ° C. for 1 minute. The amount of the resin solution for the epidermis film applied was such that the thickness at the time of drying was 28 μm. As a result, a white skin film containing a polycarbonate-based urethane resin was formed.

<Resin solution for binder layer>
After that, in order to form a urethane resin film for the binder layer on the surface of the skin film, a resin solution for the binder layer having the following composition was prepared.

Two-component urethane resin solution (polycarbonate urethane resin. Solid content 70%) 100 parts Toluene 30 parts DMF 10 parts Isocyanate-based cross-linking agent 10 parts Catalyst 0.5 parts White pigment (titanium oxide) 10 parts

The resin solution for the binder layer was applied onto the skin film using a gravure coater. The coating amount of the resin solution for the binder layer was set so that the thickness of the resin film as a resin film became 40 μm when dried. As a result, a resin film having a skin film and a binder layer was produced.

As the fiber sheet 2 in this example, a polypropylene non-woven fabric (with a basis weight of 30 g / m2 and a thickness of 360 μm) was prepared.
A polypropylene non-woven fabric was superposed on the binder layer of the produced resin film, niped with a nip roll, and dried at 100 ° C. for 1 minute.
After that, heat treatment was performed at 150 ° C. for 1 minute, and aging was performed at 60 ° C. for 72 hours. In this way, the skin sheet 11 of this example was manufactured.

<Asphalt layer>
In order to form the asphalt layer 12 in the roofing sheet 10 of this example, the following core material, permeation asphalt, and coating asphalt were prepared. However, in the following, "%" represents "mass%".
Core: non-woven polyester fabric (basis weight ^{140g / m 2 ~156g / m 2} )
Penetration asphalt: 100% blown asphalt
Asphalt for coating:
Straight asphalt 65% SBS 10% Resin 4% Filler 21%

<Adhesive layer>
In order to form the adhesive layer 5 in the roofing sheet 10 of Example 1, an asphalt-based adhesive having the following composition was prepared.
Straight asphalt 30% SB (styrene-butadiene) elastomer 22% Filler 2% Mixture of butyl rubber and mineral oil 30% Adhesive resin 16%

The core material was impregnated with asphalt for permeation, and the asphalt for coating was uniformly applied to both sides using an addiction roll. The coating amount of the asphalt for coating was set so that the thickness of the asphalt layer 12 was 2.0 mm. As a result, the asphalt layer 12 was obtained.
After that, the skin sheet 11 of this example in which the release paper for wrap was attached to the surface of the resin film 1 was attached to one surface of the prepared asphalt layer 12. Further, in the asphalt layer 12, the above-mentioned asphalt-based adhesive material was applied to the entire surface of the surface opposite to the surface on which the skin sheet 11 was attached to form the adhesive material layer 5. A peelable protective film 6 made of a polypropylene film was laminated on the adhesive layer 5. In this way, the roofing sheet 10 of this example was manufactured.

[Example 2]
The skin sheet 11 and the roofing sheet 10 of Example 2 were manufactured as follows.
First, the skin sheet 11 of this example was produced by the second method.

<Resin solution for resin film>
In order to form the resin film 1 of the skin sheet 11, a resin solution for a resin film having the following composition was prepared.

Polyvinyl chloride 100 parts Dioctyl phthalate 70 parts White pigment (titanium oxide) 10 parts

As the fiber sheet 2 in this example, a polyester taffeta (with a basis weight of 72 g / m2 and a thickness of 150 μm) was prepared.
The resin solution for the resin film was applied onto the taffeta using a rotary screen. The amount of the resin solution for the resin film applied was such that the thickness on the taffeta became 100 μm when dried.
After that, the taffeta coated with the resin solution for the resin film was heated at 180 ° C. for 1 minute to solidify the resin solution for the resin film. In this way, the skin sheet 11 of this example was manufactured.

After that, the skin sheet 11 of this example, the adhesive layer 5 and the peelable protective film 6 similar to Example 1 are attached to the asphalt layer 12 similar to Example 1 in the same manner as in Example 1. I matched it. In this way, the roofing sheet 10 of this example was manufactured.

[Example 3]
<Resin composition for heat ray reflective layer>
In order to impart the heat ray reflecting layer on the resin film 1, a resin composition for a heat ray reflecting layer having the following composition was prepared.

Kikusui SP Power Thermo Si Main agent (Y-152 green) 100 parts (Fluororesin paint containing titanium oxide heat ray reflector)
Kikusui SP Power Thermo Si Hardener 10 parts (all of the above are trade names; manufactured by Kikusui Chemical Industry Co., Ltd.)

The resin composition for the heat ray reflecting layer was applied in a grid pattern on the resin film 1 of the skin sheet 11 similar to Example 1 using a gravure coater, and then heat-treated at 120 ° C. for 3 minutes. The amount of the resin composition for the heat ray reflecting layer applied was 24 g / m ² as the weight after the heat treatment. Further, by leveling the resin composition for the heat ray reflecting layer, a heat ray reflecting layer having a thickness of 3 μm was formed to cover the entire surface of the resin film 1.
In this way, the skin sheet 11 of the present embodiment in which a green heat ray reflecting layer containing a heat ray reflecting substance is provided on the resin film 1 was manufactured.

After that, the skin sheet 11 of this example, the adhesive layer 5 and the peelable protective film 6 similar to Example 1 are attached to the asphalt layer 12 similar to Example 1 in the same manner as in Example 1. I matched it. In this way, the roofing sheet 10 of this example was manufactured.

[Example 4]
The skin sheet of this example in which a blue heat ray reflecting layer containing a heat ray reflecting substance is provided on the resin film 1 in the same manner as in Example 3 except that the following resin composition for the heat ray reflecting layer is used. 11 and the roofing sheet 10 were manufactured. The amount of the resin composition for the heat ray reflecting layer applied is 23 g / m ² as the weight after the heat treatment, and the heat ray reflection having a thickness of 3 μm covers the entire surface of the resin film 1 by leveling the resin composition for the heat ray reflecting layer. A layer was formed.

Kikusui SP Power Thermo Si Main agent (Y-110 Venice Blue) 100 parts (Fluororesin paint containing titanium oxide heat ray reflector)
Kikusui SP Power Thermo Si Hardener 10 parts (all of the above are trade names; manufactured by Kikusui Chemical Industry Co., Ltd.)

[Example 5]
The skin of this example in which a gray heat ray reflecting layer containing a heat ray reflecting substance is provided on the resin film 1 in the same manner as in Example 3 except that the following resin composition for the heat ray reflecting layer is used. Sheet 11 and roofing sheet 10 were manufactured. The amount of the resin composition for the heat ray reflecting layer applied is 22 g / m ² as the weight after the heat treatment, and the heat ray reflection having a thickness of 3 μm covers the entire surface of the resin film 1 by leveling the resin composition for the heat ray reflecting layer. A layer was formed.

Prenocolor heat shield (silver gray) 100 parts (silicon resin paint containing titanium oxide heat ray reflector. Product name; manufactured by Nissin Kogyo Co., Ltd.)

[Example 6]
The skin of this example in which a gray heat ray reflecting layer containing a heat ray reflecting substance is provided on the resin film 1 in the same manner as in Example 3 except that the following resin composition for the heat ray reflecting layer is used. Sheet 11 and roofing sheet 10 were manufactured. The amount of the resin composition for the heat ray reflecting layer applied is 22 g / m ² as the weight after the heat treatment, and the heat ray reflection having a thickness of 3 μm covers the entire surface of the resin film 1 by leveling the resin composition for the heat ray reflecting layer. A layer was formed.

High Cool (Light Gray) 100 copies (Silicon resin paint containing heat ray reflector such as ceramic balloon. Product name; manufactured by Nissin Kogyo Co., Ltd.)

[Comparative Example 1]
As the roofing sheet of Comparative Example 1, a modified asphalt sheet with an adhesive layer (with sand) "Custom Sand AF" (trade name; manufactured by Nissin Kogyo Co., Ltd.) was used. In the custom sand AF, a sand grain layer composed of mineral powder grains is laminated on the surface of the modified asphalt layer. An adhesive layer is laminated on the surface opposite to the sand grain layer.

[Comparative Example 2]
The roofing sheet of Comparative Example 2 is the same as that of Comparative Example 1 except that the surface of the sand grain layer is coated with a top coat made of water-based acrylic silicon.

[Evaluation]
As the evaluation of the roofing sheets of Examples 1 and 2 and Comparative Examples 1 and 2, as shown in [Table 1], thickness measurement, outdoor exposure test, mud curling test, adhesion test, tensile test, dent test, and resistance. An impact test was conducted. Further, with respect to Examples 1 and 2, the heat resistant temperature and the water resistance were measured.

<Thickness measurement>
For the thickness of the resin film of each example, the cross section of the skin sheet was observed with an electron microscope, the thickness of the resin formed on the fiber sheet at any five places was measured, and the average value was used.
However, when the binder layer is not present on a part of the surface of the fiber sheet, or when the amount of adhesion varies greatly depending on the location, for example, when the binder layer is applied in a dot shape or a lattice shape, the binder layer Arbitrary 5 places to which the resin for the binder layer was applied were selected, the thickness of the thickest part to which the resin for the binder layer was applied was measured, and the average value was used.

<Outdoor exposure test>
The roofing sheets of each example and each comparative example were attached to a concrete test roof and exposed to the outdoors for 180 days. As an evaluation after the test, it was visually confirmed whether rust on the roofing sheet surface, cracks on the roofing sheet, and sand fall occurred.

<Mad curling test>
As the test body of this test, roofing sheets of each example and each comparative example cut into a square of 13 cm × 13 cm were used.
A bentonite reagent was prepared by mixing bentonite, calcium carbonate, and water (tap water). The mass ratio of bentonite: calcium carbonate: water in the bentonite reagent was 100: 200: 800.
After that, 30 g of bentonite reagent was applied to a square area of 10 cm × 10 cm on the central portion of the surface of the test piece (the surface facing outward after construction). After that, the test piece was cured in a dryer adjusted to 80 ° C.
During curing, tap water was sprayed on the bentonite reagent-coated portion of the test piece by spraying every 3 hours. After spraying tap water 10 times, the test piece was taken out from the dryer, the surface condition of the test piece was observed, and the presence or absence of mud curling was evaluated.

<Adhesive strength>
In the roofing sheet, the adhesive strength between the surface layer composed of the skin sheet, the sand grain layer, the top coat and the like and the asphalt layer was measured as follows.
FIG. 5 is a schematic perspective view showing a test piece in an adhesive strength test. FIG. 6 is a schematic front view showing a test apparatus used for the adhesive strength test.
The shape of the measurement sample S of the roofing sheet of each Example and each Comparative Example was an elongated rectangle of 9 cm × 21 cm.
As shown in FIG. 5, as the test body, a laminated plate in which the adhesive layer of the measurement sample S was bonded to the surface of the flexible plate 101 made of a rectangular plate having the same shape was used. As the flexible plate 101, a flexible plate having a thickness of 8 mm was used.
A test jig 102 was adhered to the surface of the measurement sample S in the test body using an epoxy adhesive. As the test jig 102, an iron member having a plate-shaped fixing portion 102a of 4 cm × 4 cm × 5 cm and a connecting portion 102b erected on the fixing portion 102a and connected to a tensile test described later was used. The test jig 102 was fixed at three locations at a pitch of 6 cm in the longitudinal direction. Each test jig 102 was fixed to the center of the measurement sample S in the lateral direction.

As shown in FIG. 6, each test jig 102 in the test body was fixed to the upper clamp 105 of the tensile tester 100 via the fixing jig 103. The test piece was placed inside the load application jig 104 fixed to the lower clamp 106 of the tensile tester 100. The load application jig 104 is provided with locking portions 104a facing each other at a distance narrower than the short width of the test piece and wider than the width of the fixing portion 102a of the test jig 102.
With such a configuration, when the upper clamp 105 and the lower clamp 106 are moved and pulled, the locking portion 104a is locked to the end portion in the lateral direction of the test body, and the test body is used for each test jig. A load is received from the fixing portion 102a of 102 upward in the layer thickness direction.
As the tensile tester 100, an automatic recording type tensile tester Strograph VE10D (trade name; manufactured by Toyo Seiki Co., Ltd.) was used. The measurement conditions were a temperature of 20 ° C. and a tensile speed of 50 mm / min.
In this test, the adhesive strength was evaluated in the fractured state when the measurement sample S was fractured. The fracture state was judged to be "good" when the flexil plate and the adhesive material were peeled off, "possible" when the surface of the measurement sample was agglomerated, and "impossible" when the surface of the measurement sample was peeled off.

<Tensile test>
The tensile tests of the roofing sheets of Examples 1 and 2 and Comparative Example 1 were performed in accordance with the tensile strength described in JIS A 6013 modified asphalt roofing sheet. A standard value was set for the roofing sheet classification as "exposed single-layer waterproof layer and non-exposed single-layer waterproof R class".
As for Comparative Example 2, since it is clear that the same result as that of Comparative Example 1 can be obtained, this test was not conducted.

<Dent test, impact resistance test>
The roofing sheets of Examples 1 and 2 and Comparative Example 1 are bonded to a modified asphalt sheet with an adhesive layer (for non-exposed multi-layer waterproofing) "EE Roof BF" (trade name: manufactured by Nissin Kogyo Co., Ltd.). As a test body, the 2014 revised version of the building construction standard specifications and commentary JASS 8 waterproofing work (edited by the Architectural Institute of Japan) dent test and resistance to dents according to the description in the performance evaluation test method of the membrane waterproof layer. An impact test was conducted. [Table 1] shows the evaluation results of Examples 1 and 2 when compared with Comparative Example 1 based on the results of Comparative Example 1.
As for Comparative Example 2, since it is clear that the same result as that of Comparative Example 1 can be obtained, this test was not conducted.

<Heat-resistant temperature>
The heat resistant temperature of the roofing sheets of Examples 1 and 2 was measured by the measuring method defined in the first embodiment.
Since the roofing sheets of Comparative Examples 1 and 2 did not have a skin sheet whose heat resistance should be evaluated, this test was not performed.

<Water resistance>
The water resistance of the skin sheets of Examples 1 and 2 was measured according to the JIS L1092 water resistance test (hydrostatic pressure method) A method (low water pressure method). The front side (the surface of the test piece that hits water) at the time of water resistance measurement was the resin film side that comes into contact with water such as rain when used as a roofing sheet.

<Solar reflectance in the near infrared region>
The solar reflectance in the near-infrared region of each Example and each Comparative Example was measured according to the method for determining the solar reflectance of the JIS K5602 coating film. Specifically, the spectrophotometer was a Hitachi spectrophotometer U-4100 (trade name; manufactured by Hitachi High-Tech Science Co., Ltd.) equipped with an integrating sphere unit, and the light was measured at an incident angle of 4 °. The value obtained by multiplying the reflectance of 780 to 2500 nm by the weight factor and integrating the value was used.

<Confirmation of temperature reduction effect>
The roofing sheet 10 of Examples 1, 3 to 6 and the roofing sheet of Comparative Example 1 were put on a heat insulating material having a thickness of 50 mm, and the temperature between the heat insulating material outdoors and the roofing sheet 10 as a test body was measured ( Measurement location: Nissin Kogyo Co., Ltd. Saitama factory premises). The measuring device is Ondotori Jr. TR-52i (trade name: manufactured by T & D Co., Ltd.) was used.
The evaluation method was the difference in the maximum temperature on the measurement day between each example and the comparative example.

[Evaluation results]
The skin sheet 11 of Example 1 had a thickness of 260 μm and a basis weight of 75 g / m ² . In particular, the thickness of the resin film 1 was 40 μm.
The roofing sheet 10 of Example 1 had a thickness of 2 mm and a basis weight of 2215 g / m ² .
The skin sheet 11 of Example 2 had a thickness of 243 μm and a basis weight of 212 g / m ² . In particular, the thickness of the resin film 1 was 100 μm.
The roofing sheet 10 of Example 2 had a thickness of 2 mm and a basis weight of 2352 g / m ² .
As described above, in Examples 1 and 2, since the resin skin sheet 11 is remarkably lighter than the sand grain layer, the basis weight is small. In particular, the skin sheet 11 of Example 1 was further lightened as compared with Example 2.
On the other hand, the roofing sheets 10 of Comparative Examples 1 and 2 had a basis weight of 3620 g / m ² , which was significantly heavier than that of Examples 1 and 2. Specifically, when compared with the roll-wound product of 8 m, the weight of Example 1 was about 10 kg lighter. Therefore, the roofing sheets of Examples 1 and 2 were easy to carry and construct.

Both the skin sheet 11 of Examples 1 and 2 and the roofing sheet 10 having the skin sheet 11 had a flat surface and were white, so that they were excellent in aesthetic appearance.
The roofing sheets 10 of Examples 1 and 2 are light in color, unlike the conventional roofing sheets that are darkened by using mineral particles as in Comparative Examples 1 and 2, and therefore the temperature rises as the temperature rises. Can also be suppressed, which can contribute to the reduction of the work labor of the workers. Furthermore, the bright color makes it possible to create a bright atmosphere, which is excellent in design.

As shown in [Table 1], in the outdoor exposure tests of Examples 1 and 2, neither rust nor cracks occurred, and no particular abnormality was observed. In Examples 1 and 2, since the surface did not have a sand grain layer, no sand fall occurred and no abnormality was observed.
On the other hand, in Comparative Example 1, rust, cracks, and sand fall occurred. In Comparative Example 2, since it had a top coat, sand did not fall off, but rust and cracks occurred. Due to these abnormalities, the design after the test in Comparative Examples 1 and 2 was further inferior to that before the test.

In the mud curling test of Examples 1 and 2, no mud curling occurred.
On the other hand, in Comparative Examples 1 and 2, mud curling occurred. Due to the occurrence of mud curling, the design after the test in Comparative Examples 1 and 2 was further inferior to that before the test.

The evaluation of the adhesion test was "good" in Example 1, "OK" in Example 2, and Comparative Examples 1 and 2. Therefore, Example 2 had the same adhesive strength as Comparative Examples 1 and 2, but Example 1 had even better adhesive strength than Example 2.

In the tensile tests of Examples 1 and 2 and Comparative Example 1, all of them exceeded the reference value and were therefore “passed”.
The evaluation of the dent test of Examples 1 and 2 was "equivalent" to that of Comparative Example 1.
The evaluation of the impact resistance test of Examples 1 and 2 was "equivalent" to that of Comparative Example 1.
Therefore, in the tensile test, the dent test, and the impact resistance test, Examples 1 and 2 had the same evaluation as Comparative Example 1.

The heat resistant temperature of the skin sheet 11 of Example 1 was 220 ° C. or higher. Therefore, when the skin sheet 11 is attached to the asphalt layer 12, the hot asphalt layer 12 and the skin sheet 11 are overlapped with each other, but there is a problem that the skin sheet 11 melts or has holes. It did not occur.
The heat resistant temperature of the skin sheet 11 of Example 2 was 170 ° C. The skin sheet 11 of Example 2 was heavy and somewhat difficult to handle when processed in a long length, and the resin film 1 was softened immediately after bonding with the asphalt layer 12, but it was cooled. The resin film 1 was cured again by the cooling step using a roll. As a result, no holes were formed in the skin sheet 11, and no particular trouble in handling occurred.
The water resistance of the skin sheets 11 of Examples 1 and ₂ was 2000 mmH ₂ O or more.

The roofing sheet 10 of Example 1 having a solar reflectance in the near infrared region of 23% has a temperature reduction of about 5 ° C. as compared with the roofing sheet of Comparative Example 1 having a solar reflectance of 19% in the near infrared region. The effect was confirmed.
The roofing sheet 10 of Example 3 having a solar reflectance in the near infrared region of 43% has a temperature reduction effect of 7 ° C. as compared with the roofing sheet of Comparative Example 1 having a solar reflectance of 19% in the near infrared region. Was confirmed.
The roofing sheet 10 of Example 4 having a solar reflectance in the near infrared region of 52% has a temperature reduction effect of 9 ° C. as compared with the roofing sheet of Comparative Example 1 having a solar reflectance of 19% in the near infrared region. Was confirmed.
The roofing sheet 10 of Example 5 having a solar reflectance in the near infrared region of 65% has a temperature reduction effect of 13 ° C. as compared with the roofing sheet of Comparative Example 1 having a solar reflectance of 19% in the near infrared region. Was confirmed.
The roofing sheet 10 of Example 6 having a solar reflectance in the near infrared region of 80% has a temperature reduction effect of 17 ° C. as compared with the roofing sheet of Comparative Example 1 having a solar reflectance of 19% in the near infrared region. Was confirmed.

Although each embodiment of the present invention has been described above together with each embodiment, the present invention is not limited to each embodiment and each embodiment. Configurations can be added, omitted, replaced, and other modifications without departing from the spirit of the present invention.
Further, the present invention is not limited by the above description, but is limited only by the appended claims.

1 Resin film 2 Fiber sheet 3A Upper layer 3B Lower layer 4 Core material 5, 25 Adhesive material layer (adhesive layer)
6 Removable protective film 10, 20, 30 Roofing sheet (roofing sheet with skin sheet)
10A, 20A Roofing sheet body 11 Skin sheet (roofing sheet skin sheet)
12 Asphalt layer 27 Mineral crushed material

Claims (22)

With a resin film
With fiber sheet,
Skin sheet for roofing sheet, including. The fiber sheet is a non-woven fabric.
The skin sheet for roofing sheet according to claim 1. The material of the fiber sheet contains polypropylene.
The skin sheet for roofing sheet according to claim 1 or 2. The thickness is 50 μm or more and 5000 μm or less.
The skin sheet for roofing sheet according to any one of claims 1 to 3. The basis weight is 200 g / m2 or less.
The skin sheet for roofing sheet according to any one of claims 1 to 4. The water resistance measured by JIS L1092 water pressure resistance test (hydrostatic pressure method) A method (low water pressure method) is 2000 mmH2O or more.
The skin sheet for roofing sheet according to any one of claims 1 to 5. The resin film is
It is laminated on one side of the fiber sheet and
It has a thickness of 5 μm or more and 500 μm or less.
The skin sheet for roofing sheet according to any one of claims 1 to 6. The heat resistant temperature of the resin film is 180 ° C. or higher.
The skin sheet for roofing sheet according to any one of claims 1 to 7. The material of the resin film includes a polycarbonate urethane resin.
The skin sheet for roofing sheet according to any one of claims 1 to 8. The solar reflectance in the near infrared region measured according to JIS K5602 is 40% or more.
The skin sheet for roofing sheet according to any one of claims 1 to 9. A heat ray reflecting layer containing a heat ray reflecting substance is further imparted to at least a part of the surface of the resin film.
The skin sheet for roofing sheet according to claim 10. Asphalt layer and
The skin sheet for roofing sheet according to any one of claims 1 to 11 laminated on the asphalt layer.
Roofing sheet with skin sheet. The thickness is 1.5 mm or more and 5.0 mm or less.
The roofing sheet with a skin sheet according to claim 12. The basis weight is 1500 g / m2 or more and 5500 g / m2 or less.
The roofing sheet with a skin sheet according to claim 12 or 13. A core material made of non-woven fabric is arranged in the asphalt layer.
The roofing sheet with a skin sheet according to any one of claims 12 to 14. The basis weight of the core material is
50 g / m2 to 200 g / m2,
The roofing sheet with a skin sheet according to claim 15. The core material is
Includes a fiber material consisting of at least one of a polymeric chemical fiber material and a glass fiber material,
The roofing sheet with a skin sheet according to claim 15 or 16. The core material
Impregnated with penetrating asphalt consisting of at least one of modified asphalt and blown asphalt,
The roofing sheet with a skin sheet according to any one of claims 15 to 17. The asphalt layer
It has a structure in which coating asphalt is laminated on the core material.
The coating asphalt is
Consists of at least one of modified asphalt and 3 types of asphalt for waterproofing work,
The roofing sheet with a skin sheet according to any one of claims 15 to 18. Pyroclastic material adheres to the surface of the asphalt layer on the opposite side of the roofing sheet skin sheet to which the roofing sheet is laminated.
The roofing sheet with a skin sheet according to any one of claims 12 to 19. An adhesive layer and a peelable protective film are laminated in this order on the surface of the asphalt layer opposite to the roofing sheet skin sheet to which the roofing sheet is laminated.
The roofing sheet with a skin sheet according to any one of claims 12 to 19. In the asphalt layer, a pyroclastic material and an adhesive layer formed in an island shape or a band shape are arranged on the surface of the asphalt layer on the opposite side of the roofing sheet skin sheet to which the roofing sheet is laminated.
A peelable protective film laminated on the adhesive layer is further provided so as to cover the pyroclastic material and the adhesive layer.
The roofing sheet with a skin sheet according to any one of claims 12 to 19.

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