JP6411760B2 - Waterproof sheet for building foundation - Google Patents
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- JP6411760B2 JP6411760B2 JP2014073141A JP2014073141A JP6411760B2 JP 6411760 B2 JP6411760 B2 JP 6411760B2 JP 2014073141 A JP2014073141 A JP 2014073141A JP 2014073141 A JP2014073141 A JP 2014073141A JP 6411760 B2 JP6411760 B2 JP 6411760B2
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Description
本発明は、瓦、スレート系及び金属などの屋根葺材と野地板との間に用いられる建築下地用防水シートである。 The present invention is a waterproof sheet for building foundations used between roof covering materials such as tiles, slate systems, and metals, and field boards.
住宅の屋根は、瓦やスレート、コロニアル、金属板等の屋根葺材で被覆されている。しかし、屋根葺材だけでは雨水の浸入を完全に防止することは困難である。
そこで、野地板と屋根葺材の間に、アスファルトルーフィング（ＪＩＳ−Ａ６００５規定）、ゴム改質アスファルトルーフィング（ＪＩＳ−Ａ６０１３規定）等から形成された屋根下地シートを葺くことで防水性を向上させていた。しかし、これらの屋根下地シートは、目付が約１ｋｇ／ｍ２以上と重い。このため、屋根に持ち上げるのが困難であり、また、アスファルトによって手や野地板が汚れ易いという問題があった。また、冬などの低温時には、折れ曲がった際に亀裂が入り易く、釘やタッカー等で固定する際にも破れて漏水するおそれがあった。さらに、長期間使用することにより、気候による寒暖の差により屋根下地シートが伸縮し亀裂が生じたり、寒暖の差や太陽熱等の影響で屋根下地シートが収縮し亀裂が生じたり、屋根下地シート同士の重ね合わせ部分に隙間が生じて漏水したり、アスファルトから油分が抜けて脆くなって亀裂が生じたりするおそれがあった。
The roof of the house is covered with roofing materials such as tiles, slate, colonial, metal plates. However, it is difficult to completely prevent the intrusion of rainwater only with roofing materials.
Therefore, the waterproof property is improved by spreading a roof base sheet formed from asphalt roofing (JIS-A6005 standard), rubber modified asphalt roofing (JIS-A6013 standard), etc. between the field board and the roofing material. It was. However, these roof base sheets have a heavy basis weight of about 1 kg / m 2 or more. For this reason, it was difficult to lift to the roof, and there was a problem that hands and field boards were easily soiled by asphalt. Further, at low temperatures such as in winter, cracks are likely to occur when bent, and there is a risk of tearing and water leakage when fixing with nails or tuckers. In addition, when used for a long period of time, the roof base sheet expands and contracts due to the difference in temperature depending on the climate, or the roof base sheet contracts and cracks due to the influence of the temperature difference and solar heat, etc. There was a risk that a gap would occur in the overlapped portion of the water and water leaked, or that oil would fall out of the asphalt and become brittle and cracked.
これらの問題を解決するものとして、アスファルト系やゴム改質アスファルト系の材料を用いない屋根下地シートが開発されている。
例えば、特許文献１には、布帛の表面に伸縮性、粘着性を有する樹脂層を有し、その上に粘着性の少ない樹脂層を有し、裏面には粘着性の少ない樹脂層を有した屋根下葺材が開示されている。また、特許文献２には、ゴム系シートに細孔を穿孔した建材用透湿・防水性シートが開示されている。また、特許文献３には、吸水性高分子樹脂からなる膨潤層が不織布と表面フィルムで狭持された多層構造体シートが開示されている。
In order to solve these problems, roof base sheets that do not use asphalt-based or rubber-modified asphalt-based materials have been developed.
For example, Patent Document 1 has a stretchable and tacky resin layer on the surface of a fabric, a less tacky resin layer thereon, and a backside having a less tacky resin layer. An underfloor brazing material is disclosed. Patent Document 2 discloses a moisture-permeable and waterproof sheet for building materials in which pores are perforated in a rubber-based sheet. Patent Document 3 discloses a multilayer structure sheet in which a swelling layer made of a water-absorbing polymer resin is sandwiched between a nonwoven fabric and a surface film.
しかし、特許文献１の屋根下葺材では、太陽光などの熱により粘着性を有する樹脂が軟化しシート外部に浸み出すおそれがある。時間の経過につれて、その浸み出しにより樹脂層が薄くなったり、また上からの荷重によりシート内の粘着性を有する樹脂が潰され、樹脂層の厚みが薄くなったりすることで、樹脂層が釘穴止水性に対する十分な厚みを維持することが出来ないおそれがある。
また、特許文献２の建築用透湿・防水性シートでは、細孔を穿孔したシートのため、耐水性が不十分である。また、このシートを透湿・防水性の不織布とラミネートしても、ゴム系シートの釘やタッカーなどにより生じた隙間を十分に埋めることができず、釘穴止水性を十分に確保することができないおそれがある。
また、特許文献３の多層構造体シートでは、吸水性高分子樹脂が大量に吸水することで、狭持していた不織布、又は表面フィルムとの密着が悪くなり、剥離のリスクがともなうとともに釘やタッカーなどにより生じた隙間を十分に埋めることができず、釘穴止水性を十分に確保することができないおそれがある。
本発明は、かかる問題点に鑑みてなされたものであって、釘やタッカーなどによる釘穴の止水性に優れ、かつ軽量で施工性が良好で取り扱いやすい建築下地用防水性シートを提供することを目的とするものである。
However, in the roof underlaying material of Patent Document 1, the resin having adhesiveness is softened by heat such as sunlight, and there is a possibility that the resin may ooze out of the sheet. As the time passes, the resin layer becomes thinner due to the leaching, or the adhesive resin in the sheet is crushed by the load from above, and the thickness of the resin layer becomes thinner. There is a possibility that a sufficient thickness against the nail hole water stoppage cannot be maintained.
In addition, the moisture permeable and waterproof sheet for building disclosed in Patent Document 2 is insufficient in water resistance because it is a sheet having pores perforated. Also, even if this sheet is laminated with a moisture permeable and waterproof nonwoven fabric, the gaps created by the nails and tuckers of the rubber-based sheet cannot be sufficiently filled, and sufficient water resistance for nail holes can be secured. It may not be possible.
Further, in the multilayer structure sheet of Patent Document 3, the water-absorbing polymer resin absorbs a large amount of water, resulting in poor adhesion with the sandwiched nonwoven fabric or surface film, with a risk of peeling and nail or There is a possibility that the gap generated by the tucker or the like cannot be sufficiently filled and nail hole water stoppage cannot be sufficiently ensured.
The present invention has been made in view of such problems, and provides a waterproof sheet for building foundations that is excellent in water-stopping properties of nail holes by nails, tuckers, etc., is lightweight, has good workability, and is easy to handle. It is intended.
上記の課題を達成すべく鋭意検討した結果、効果の顕著な本発明に到達した。
即ち、本発明は（１）補強シートの屋根葺材側に樹脂を積層させた少なくとも２層からなる多層構造の建築下地用防水シートであって、補強シートの屋根葺材側に、第１の樹脂層が積層されており、第１の樹脂層に用いられる熱可塑性樹脂の５％歪み時引張応力が０．５ＭＰａ〜６．０ＭＰａであり、かつ、補強シートの野地板側に、第２の樹脂層が積層されており、第２の樹脂層に用いられる熱可塑性樹脂の５％歪み時引張応力が０．５ＭＰａ〜６．０ＭＰａであり、第１の樹脂層の厚みが６０μｍ〜２５０μｍであり、第１の樹脂層の厚みに対する第２の樹脂層の厚みの比率が、０．５〜１．６である。
また、（２）第１の樹脂層に用いられる樹脂種がエチレン−酢酸ビニル重合体であることが好ましい。
As a result of intensive studies to achieve the above-mentioned problems, the present invention has been achieved with remarkable effects.
That is, the present invention is (1) a waterproof sheet for building foundations having a multilayer structure composed of at least two layers in which a resin is laminated on the roofing material side of the reinforcing sheet, the first resin layer on the roofing material side of the reinforcing sheet There are laminated, 5% strain at a tensile stress of the thermoplastic resin used for the first resin layer is Ri 0.5MPa~6.0MPa der and the sheathing roof board side of the reinforcing sheet, the second resin Layers are laminated, the tensile stress at 5% strain of the thermoplastic resin used for the second resin layer is 0.5 MPa to 6.0 MPa, and the thickness of the first resin layer is 60 μm to 250 μm, The ratio of the thickness of the second resin layer to the thickness of the first resin layer is 0.5 to 1.6 .
Moreover, (2) It is preferable that the resin seed | species used for the 1st resin layer is an ethylene-vinyl acetate polymer .
本発明によれば、補強シートの屋根葺材側に５％歪み時引張応力が０．５ＭＰａ〜６．０ＭＰａの樹脂を積層することで優れた釘穴止水性を有する建築下地用防水シートを提供することができる。補強シートの屋根葺材側に該樹脂を積層することにより、本発明の建築下地用防水シートに釘等を貫通させても、釘周りの樹脂が釘を締め付けることによって、釘穴からの水の浸入を防止し、優れた止水性を発揮することが出来るのである。また、重量のあるアスファルトを用いないから、軽量性に優れている。
ADVANTAGE OF THE INVENTION According to this invention, the waterproof sheet | seat for building foundations which has the outstanding nail-hole water stop property by laminating | stacking resin whose tensile stress at the time of 5% distortion is 0.5 Mpa-6.0 Mpa on the roof covering material side of a reinforcement sheet is provided. be able to. By laminating the resin on the roof covering material side of the reinforcing sheet, even if a nail or the like penetrates the waterproof sheet for building foundation of the present invention, the resin around the nail tightens the nail, so that water enters from the nail hole. Can be prevented and excellent water-stopping performance can be exhibited. In addition, because it does not use heavy asphalt, it is excellent in lightness.
以下、本発明の実施の形態について図１に示す。本発明は補強シート２の屋根葺材側に樹脂層１ａを積層させた少なくとも２層からなる多層構造の建築下地用防水シートであって、該熱可塑性樹脂の５％歪み時引張応力が０．５ＭＰａ〜６．０ＭＰａであることを特徴とする建築下地用防水シートである。本発明において、屋根葺材側とは、補強シート２を基準にして、屋根を設置する際に屋根葺材が存在する側であり、すなわち、鉛直方向の略上側を示す。野地板側とは、補強シート２を基準にして、屋根を設置する際に野地板が存在する側であり、すなわち、鉛直方向の略下側を示す。 Hereinafter, an embodiment of the present invention is shown in FIG. The present invention is a waterproof sheet for building foundations having a multilayer structure composed of at least two layers in which a resin layer 1a is laminated on the roofing material side of the reinforcing sheet 2, and the tensile stress at 5% strain of the thermoplastic resin is 0.5 MPa. It is a waterproof sheet for building foundations, characterized by being -6.0 MPa. In the present invention, the roof covering material side is the side where the roof covering material is present when the roof is installed with reference to the reinforcing sheet 2, that is, the substantially upper side in the vertical direction. The base plate side is a side where the base plate is present when the roof is installed with reference to the reinforcing sheet 2, that is, a substantially lower side in the vertical direction.
本発明の樹脂層１ａに用いられる樹脂は、５％歪み引張応力が０．５ＭＰａ〜６．０ＭＰａで、より好ましくは１．０ＭＰａ〜４．０ＭＰａである。０．５ＭＰａ未満であると、施工の際に釘周りの締め付け効果が得られないため止水効果が得られにくい。一方、６．０ＭＰａを超えると、施工時に樹脂層１ａが伸びにくく、樹脂層１ａが釘に追従しにくいため、十分な釘穴止水効果が得られない。 The resin used for the resin layer 1a of the present invention has a 5% strain tensile stress of 0.5 MPa to 6.0 MPa, more preferably 1.0 MPa to 4.0 MPa. If the pressure is less than 0.5 MPa, it is difficult to obtain a water stop effect because a tightening effect around the nail cannot be obtained during construction. On the other hand, if it exceeds 6.0 MPa, the resin layer 1a is not easily stretched during construction, and the resin layer 1a is difficult to follow the nail, so that a sufficient nail hole water-stopping effect cannot be obtained.
また、樹脂層１ａに用いられる樹脂種としては特に限定されることはない。具体的にはポリエチレン、ポリプロピレン、エチレン−アクリル酸エチル共重合体、エチレン−アクリル酸メチル共重合体、エチレン−酢酸ビニル共重合体などのポリオレフィン系樹脂、エチレン−プロピレン共重合体ゴム、エチレンープロピレン−ジエン共重合体ゴムなどを用いたポリオレフィン系エラストマー、非晶質ポリオレフィンを含有する軟質ポリオレフィン樹脂、ポリウレタン系樹脂等が挙げられ、これらは単独または２種以上の混合物が使用でき、上記５％歪み引張応力の範囲を満足するものであればよい。なかでも、生産性を考慮すると、熱可塑性樹脂が好ましく、釘に対する締め付け、長期耐久性が優れているという点でエチレン−酢酸ビニル重合体がより好ましい。さらに、上記５％歪み引張応力の範囲を満足させるように、該樹脂に皮膜剤、架橋剤、硬化剤、可塑剤などの添加剤を含有させてもよい。また、該樹脂の性能を害さない範囲であれば、必要に応じて、撥水剤、酸化防止剤、光安定剤、紫外線吸収剤、耐候剤、防滑剤、顔料、充填剤、その他の添加剤を加えてもよく、目的と用途に応じて適宜に選択すればよい。 Moreover, it does not specifically limit as a resin seed | species used for the resin layer 1a. Specifically, polyolefin resins such as polyethylene, polypropylene, ethylene-ethyl acrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-vinyl acetate copolymer, ethylene-propylene copolymer rubber, ethylene-propylene -Polyolefin elastomers using diene copolymer rubber, etc., soft polyolefin resins containing amorphous polyolefins, polyurethane resins, etc., can be used alone or as a mixture of two or more, and the above 5% strain Any material satisfying the tensile stress range may be used. Among these, in consideration of productivity, a thermoplastic resin is preferable, and an ethylene-vinyl acetate polymer is more preferable in terms of excellent fastening to a nail and long-term durability. Furthermore, additives such as a film agent, a crosslinking agent, a curing agent, and a plasticizer may be contained in the resin so as to satisfy the range of 5% strain tensile stress. Moreover, as long as it does not impair the performance of the resin, a water repellent, an antioxidant, a light stabilizer, an ultraviolet absorber, a weathering agent, an anti-slip agent, a pigment, a filler, and other additives as necessary. May be added, and may be appropriately selected depending on the purpose and application.
また、樹脂層１ａの厚みは４０μｍ〜３００μｍが好ましく、より好ましくは６０μｍ〜２５０μｍである。厚みが４０μｍ未満であると、釘等への追従が不十分で、釘穴止水性が悪くなる。さらにシート上を歩行の際に靴底で擦られ、シートが裂けることがあり防水性を出せなくなる。またシート自体の引裂強度が低下する。一方、３００μｍを超えると、シートが硬くなり、巻きにくくなるばかりか、目付重量が重くなり、取り扱いがしにくくなるおそれがある。
補強シート２に樹脂層１ａを積層する方法としては特に限定されることはない。具体的には接着剤を用いる方法、熱融着による方法、押出ラミネートによる方法などが挙げられ、これらの方法を組み合わせてもよい。なかでも生産性、補強シート２との優れた密着性を考慮すると、押出ラミネートが好ましい。
The thickness of the resin layer 1a is preferably 40 μm to 300 μm, more preferably 60 μm to 250 μm. When the thickness is less than 40 μm, the follow-up to the nail or the like is insufficient, and the water resistance of the nail hole is deteriorated. Further, when walking on the seat, it is rubbed by the shoe sole, and the seat may be torn, making it impossible to provide waterproofness. In addition, the tear strength of the sheet itself is reduced. On the other hand, if it exceeds 300 μm, the sheet becomes hard and difficult to wind, and the weight per unit area becomes heavy, which may make it difficult to handle.
The method for laminating the resin layer 1a on the reinforcing sheet 2 is not particularly limited. Specific examples include a method using an adhesive, a method using heat fusion, a method using extrusion lamination, and the like, and these methods may be combined. Of these, extrusion laminate is preferable in consideration of productivity and excellent adhesion to the reinforcing sheet 2.
本発明に用いる補強シート２としては、不織布、織布、編布、紙などが挙げられる。なかでも生産性、コストを考慮すると、不織布が好適である。該不織布は、１００℃の温度下で縮み等の外観変形がなく寸法変化が１％以下で、１００Ｎ／５ｃｍ以上の引張強度を有する、長繊維からなる不織布が好ましく用いられる。引張強度が１００Ｎ／５ｃｍ未満であると、製品を施工するときの外力で破損するおそれがある。このような不織布としては、ポリエステル系、ポリアミド系、ポリアクリル系、ポリオレフィン系などの合成樹脂製長繊維フィラメントが高密度かつ無方向に堆積接合されたものが好ましく、これらの合成樹脂には、撥水剤、耐熱向上剤、酸化防止剤、難燃剤などを含有させてもよい。撥水剤を用いることで、水の浸入を抑え、止水効果が高められる。 Examples of the reinforcing sheet 2 used in the present invention include nonwoven fabric, woven fabric, knitted fabric, and paper. Of these, non-woven fabrics are preferred in view of productivity and cost. As the non-woven fabric, a non-woven fabric made of long fibers having a tensile strength of 100 N / 5 cm or more, having a dimensional change of 1% or less without shrinkage or the like at a temperature of 100 ° C. is preferably used. If the tensile strength is less than 100 N / 5 cm, the product may be damaged by an external force when constructing the product. Such non-woven fabrics are preferably those in which long filament filaments made of synthetic resin such as polyester, polyamide, polyacrylic, and polyolefin are deposited and bonded in high density and non-direction. A liquid agent, a heat resistance improver, an antioxidant, a flame retardant, and the like may be included. By using a water repellent, the infiltration of water is suppressed and the water stop effect is enhanced.
また、該不織布の目付は３０ｇ／ｍ２〜３００ｇ／ｍ２が好ましく、より好ましくは６０ｇ／ｍ２〜１４０ｇ／ｍ２である。３０ｇ／ｍ２未満であるとシート全体の引張強度、又は引裂強度が十分に確保できないおそれがあり、一方、３００ｇ／ｍ２を超えると、不織布が厚く、重いため、持ち運びや施工時の作業性が悪くなる。該不織布の厚みは０．２ｍｍ〜１．５ｍｍが好ましく、より好ましくは０．３ｍｍ〜０．８ｍｍである。厚みが０．２ｍｍ未満であると、不織布のコシが無くなり施工性が悪くなるおそれがある。一方、１．５ｍｍを超えると、巻き径が大きくなるなど取り扱い性が悪くなる。また、該不織布は融点が１００℃以上の合成繊維で形成されていることが好ましく、より好ましくは１１０℃以上である。さらに必要に応じて、該不織布に撥水処理、難燃処理、耐候処理などの処理を行ってもよい。撥水処理を行うことで水の浸入を抑え、止水効果が高められる。 Also, the basis weight of the nonwoven fabric is preferably from 30g / m 2 ~300g / m 2 , more preferably from 60g / m 2 ~140g / m 2 . If it is less than 30 g / m 2 , the tensile strength or tear strength of the entire sheet may not be sufficiently secured. On the other hand, if it exceeds 300 g / m 2 , the nonwoven fabric is thick and heavy, so it is easy to carry and work during construction. Becomes worse. The thickness of the nonwoven fabric is preferably 0.2 mm to 1.5 mm, more preferably 0.3 mm to 0.8 mm. If the thickness is less than 0.2 mm, the non-woven fabric will be lost and the workability may be deteriorated. On the other hand, when it exceeds 1.5 mm, the handleability is deteriorated, for example, the winding diameter is increased. Moreover, it is preferable that this nonwoven fabric is formed with the synthetic fiber whose melting | fusing point is 100 degreeC or more, More preferably, it is 110 degreeC or more. Further, if necessary, the nonwoven fabric may be subjected to treatment such as water repellent treatment, flame retardant treatment, and weather resistance treatment. Water repellent treatment prevents water from entering and enhances the water stop effect.
図２に示すように、本発明に用いられる樹脂層１ａの上に保護フィルム３を積層してもよい。保護フィルム３を積層することで、釘穴止水性がさらに高められると同時に、物理的衝撃からシートを保護することができる。 As shown in FIG. 2, you may laminate | stack the protective film 3 on the resin layer 1a used for this invention. By laminating the protective film 3, the water resistance of the nail hole can be further increased, and at the same time, the sheet can be protected from physical impact.
保護フィルム３は融点が１００℃以上であることが好ましく、より好ましくは１１０℃以上である。融点が１００℃未満の樹脂フィルムは、日射により高温となったときに、熱によりシート自体が溶解したり変形したりするおそれがある。 The protective film 3 preferably has a melting point of 100 ° C. or higher, more preferably 110 ° C. or higher. When the resin film having a melting point of less than 100 ° C. becomes high temperature due to solar radiation, the sheet itself may be dissolved or deformed by heat.
また、保護フィルム３で使用する素材としては、ポリプロピレン、高密度ポリエチレン、低密度ポリエチレン、直鎖状低密度ポリエチレンなどのポリオレフィン系樹脂、エチレン酢酸コポリマー、ポリビニルアルコールエチレン酢酸ビニルコポリマーエチレン酢酸ビニルコポリマーなどの酢酸ビニル系樹脂、ポリエステル系、ポリエーテル系、ポリカーボネート系などのポリウレタン系樹脂や、ポリエチレンテレフタレート、ポリブチレンテレフタレートなどのポリエステル系樹脂が挙げられる。これらの樹脂のなかでも、融点、柔軟性、引裂強さ、耐候性の点で直鎖状低密度ポリエチレンが好ましく用いられる。 The protective film 3 may be made of a polyolefin resin such as polypropylene, high density polyethylene, low density polyethylene, and linear low density polyethylene, ethylene acetate copolymer, polyvinyl alcohol ethylene vinyl acetate copolymer, ethylene vinyl acetate copolymer, etc. Examples thereof include polyurethane resins such as vinyl acetate resins, polyester resins, polyether resins, and polycarbonate resins, and polyester resins such as polyethylene terephthalate and polybutylene terephthalate. Among these resins, linear low density polyethylene is preferably used in terms of melting point, flexibility, tear strength, and weather resistance.
また、保護フィルム３の厚みは３０μｍ〜３００μｍが好ましく、より好ましくは４０μｍ〜２５０μｍである。厚さが３０μｍ未満であると、シート上を歩行の際に靴底で擦られることでフィルム破れ、裂けることがあり防水性を出せなくなる。また、３００μｍを超えると、建築下地用防水シートが硬くなると共に、巻きにくくなるばかりか、目付重量が重くなり、取り扱いにくくなるおそれがある。保護フィルム３の積層方法としては特に限定されることはない。具体的には接着剤を用いる方法、熱融着による方法などが挙げられ、これらを組み合わせてもよい。なかでも、生産性という理由により接着剤を用いる方法が好適である。さらに、補強シート２に押出しラミネートした樹脂層１ａが半固体の状態のうちに保護フィルム３をサンドラミネートすることで加工工程を簡略化することが出来る。 Moreover, as for the thickness of the protective film 3, 30 micrometers-300 micrometers are preferable, More preferably, they are 40 micrometers-250 micrometers. If the thickness is less than 30 μm, the film may be torn and torn by rubbing with the shoe sole during walking on the sheet, and waterproofing cannot be achieved. On the other hand, when the thickness exceeds 300 μm, the waterproof sheet for building foundations becomes hard and it is difficult to wind, and the weight per unit area becomes heavy, which may make it difficult to handle. The method for laminating the protective film 3 is not particularly limited. Specific examples include a method using an adhesive and a method using heat fusion, and these may be combined. Among them, a method using an adhesive is preferable for the reason of productivity. Furthermore, the processing step can be simplified by sand-laminating the protective film 3 while the resin layer 1a extruded and laminated on the reinforcing sheet 2 is in a semi-solid state.
図３、図４に示すように、補強シート２の野地板側に樹脂層１ｂを積層してもよい。樹脂層１ｂを積層することで、防水効果が高められると同時にカーリング抑制効果も担っており、施工性を向上させる。なお、図３は補強シート２に屋根葺材側の樹脂層１ａと野地板側の樹脂層１ｂを積層した形態を示し、図４は図３の形態の樹脂層１ａの上に保護フィルム３を積層した形態を示している。 As shown in FIGS. 3 and 4, a resin layer 1 b may be laminated on the base plate side of the reinforcing sheet 2. By laminating the resin layer 1b, the waterproof effect is enhanced and at the same time the curling suppressing effect is carried out, thereby improving the workability. 3 shows a form in which a resin layer 1a on the roof covering material side and a resin layer 1b on the base plate side are laminated on the reinforcing sheet 2, and FIG. 4 shows a laminated protective film 3 on the resin layer 1a in the form of FIG. Shows the form.
本発明の樹脂層１ｂに用いられる樹脂の性能、樹脂種に関しては、樹脂層１ａと同様の樹脂を用いることが好ましい。 Regarding the performance and resin type of the resin used for the resin layer 1b of the present invention, it is preferable to use the same resin as the resin layer 1a.
また、樹脂層１ｂの厚みは、４０μｍ〜３００μｍが好ましく、より好ましくは、６０μｍ〜２５０μｍである。さらに、補強シート２の屋根葺材側に積層された層の厚みに応じて適宜に設定すればよい。例えば、図３の構成の場合には、樹脂層１ａの厚みに対する樹脂層１ｂの厚みの比率が０．５〜１．６が好ましく、より好ましくは０．７〜１．２である。また、図４の構成の場合には、樹脂層１ａと保護フィルム３の総厚みに対する樹脂層１ｂの厚みの比率が上記範囲であることが好ましい。比率が０．５未満であると、樹脂層１ａ側へのカーリング（反り）が発生し、施工性が悪くなるおそれがある。また、比率が１．６を超えると、反対に樹脂層１ｂ側へのカーリングが発生し、施工性が悪くなるおそれがある。厚さが３０μｍ未満では防水効果が薄れると共に、不織布との絡み方が弱く、密着性が低くなるおそれがある。また、３００μｍより厚くなると建築下地用防水シートが硬くなると共に、巻きにくく、さらには目付重量が重くなるため取り扱いにくくなるおそれがある。樹脂層１ｂの積層方法としては特に限定されることはなく、接着剤を用いる方法、熱融着による方法、押出ラミネートによる方法およびこれらを組み合わせることなどが挙げられるが、なかでも生産性、補強シート２との密着性により優れた押出ラミネートが好ましい。 The thickness of the resin layer 1b is preferably 40 μm to 300 μm, more preferably 60 μm to 250 μm. Furthermore, what is necessary is just to set suitably according to the thickness of the layer laminated | stacked on the roof covering material side of the reinforcement sheet 2. FIG. For example, in the case of the configuration of FIG. 3, the ratio of the thickness of the resin layer 1b to the thickness of the resin layer 1a is preferably 0.5 to 1.6, and more preferably 0.7 to 1.2. Moreover, in the case of the structure of FIG. 4, it is preferable that the ratio of the thickness of the resin layer 1b with respect to the total thickness of the resin layer 1a and the protective film 3 is the said range. When the ratio is less than 0.5, curling (warping) toward the resin layer 1a occurs, and the workability may be deteriorated. On the other hand, if the ratio exceeds 1.6, curling to the resin layer 1b side occurs, and workability may be deteriorated. When the thickness is less than 30 μm, the waterproofing effect is weakened, and the entanglement with the nonwoven fabric is weak and the adhesion may be lowered. Moreover, when it becomes thicker than 300 micrometers, while the waterproof sheet for building foundations becomes hard, it is difficult to wind, and furthermore, since the weight per unit area becomes heavy, it may be difficult to handle. The method for laminating the resin layer 1b is not particularly limited, and examples thereof include a method using an adhesive, a method using heat fusion, a method using extrusion lamination, and a combination thereof. Extrusion laminate superior in adhesion to 2 is preferred.
本発明の建築下地用防水シートの屋根葺材側の最外面と野地板側の最外面の少なくとも片方の最外面に防滑処理を行ってもよい。屋根葺材側の最外面と天然ゴム（日東化工株式会社 ＮＲシート）との静摩擦係数（ＪＩＳ−Ｐ８１４７）が０．５以上になるよう防滑処理を行うことが好ましい。天然ゴムは、作業者の靴底素材として用いられており、建築下地用防水シートとの静摩擦係数を０．５以上にすることにより、シートの上を歩行する作業者が滑る危険を防止できる。また、野地板側の最外面と野地板（林べニア産業株式会社 針葉樹構造合板）との静摩擦係数（ＪＩＳ−Ｋ７１２５）が０．３以上であることがより好ましい。野地板側の最外面に防滑処理を行うことで、建築下地用防水シートが野地板の上を滑り落ちることを確実に防ぐと同時に、上からの荷重により建築下地用防水シートと野地板にズレが生じ、打ち込まれた釘等と建築下地用防水シートが引っ掛かり裂けることを防ぐことができる。 An anti-slip treatment may be performed on at least one of the outermost surface on the roof covering material side and the outermost surface on the baseboard side of the waterproof sheet for building foundations of the present invention. It is preferable to carry out the anti-slip treatment so that the static friction coefficient (JIS-P8147) between the outermost surface on the roof covering material side and natural rubber (NR sheet, Nitto Chemical Industries, Ltd.) is 0.5 or more. Natural rubber is used as a material for the soles of workers, and by setting the coefficient of static friction with the waterproof sheet for building foundations to 0.5 or more, it is possible to prevent a worker walking on the sheet from slipping. Moreover, it is more preferable that the static friction coefficient (JIS-K7125) between the outermost surface on the field plate side and the field plate (Hayashi Veneer Industrial Co., Ltd., softwood structure plywood) is 0.3 or more. By applying anti-slip treatment to the outermost surface on the side of the field plate, it is possible to prevent the waterproof sheet for the building foundation from sliding down on the field plate, and at the same time, the load from above will cause a gap between the waterproof sheet for the building foundation and the field plate. It is possible to prevent the nail or the like that has been driven and the waterproof sheet for building foundation from being caught and torn.
防滑処理としては最外面にエンボス加工を施したり、合成樹脂を付与して凹凸を形成する方法などが挙げられ、これらを併用することが好ましい。
エンボス加工による凹凸高さは２０μｍ〜２００μｍが好ましく、より好ましくは５０μｍ〜１００μｍである。凹凸高さが２０μｍ未満であると、十分な防滑性を得られないおそれがある。また、凹凸高さが２００μｍを超えると、靴底との接触部分が凸面のみとなり、接触面積が小さくなることで防滑性が損なわれるおそれがある。エンボスの柄としては、格子状、ひし形状、丸型ドット状、ダイヤ型ドット状、などが挙げられるが、防滑性が発揮されるならば、特に形状やドット数、大きさ等は限定されない。
また、防滑性を付与するために凹凸を形成するために付与する合成樹脂としては、ポリオレフィン系、ポリエステル系、アクリル系の合成樹脂が挙げられる。特に、密着性、防滑性、撥水性が得やすい点で変性ポリオレフィン系合成樹脂が好ましい。該合成樹脂の付与量は樹脂固形分で１ｇ／ｍ２〜１５ｇ／ｍ２が好ましく、より好ましくは５ｇ／ｍ２〜１０ｇ／ｍ２である。合成樹脂の付与量が１ｇ／ｍ２未満であると、充分に防滑性を発揮できないおそれがある。一方、エンボス加工と合成樹脂を付与して凹凸を形成する方法を併用する場合には、合成樹脂の付与量が１５ｇ／ｍ２を超えると、最外面のエンボス加工の凹凸部が埋まり、防滑性が発揮しにくくなるおそれがある。さらに該合成樹脂に熱発泡性マイクロカプセル等の発泡樹脂や中空微小球を混入することによって、さらに防滑性を向上させることができる。
Examples of the anti-slip treatment include an embossing process on the outermost surface, and a method of forming an unevenness by applying a synthetic resin, and these are preferably used in combination.
The uneven height by embossing is preferably 20 μm to 200 μm, more preferably 50 μm to 100 μm. If the uneven height is less than 20 μm, there is a possibility that sufficient anti-slip property cannot be obtained. Moreover, when uneven | corrugated height exceeds 200 micrometers, a contact part with a shoe sole becomes only a convex surface, and there exists a possibility that slipperiness may be impaired because a contact area becomes small. Examples of the embossed pattern include a lattice shape, a rhombus shape, a round dot shape, and a diamond dot shape. However, the shape, the number of dots, the size, and the like are not particularly limited as long as anti-slip properties are exhibited.
Moreover, as a synthetic resin provided in order to form an unevenness | corrugation in order to provide anti-slip property, a polyolefin-type, polyester-type, and acrylic-type synthetic resin are mentioned. In particular, a modified polyolefin synthetic resin is preferable in terms of easy adhesion, slip resistance, and water repellency. Application amount of the synthetic resin is preferably 1g / m 2 ~15g / m 2 of resin solids, more preferably 5g / m 2 ~10g / m 2 . If the applied amount of the synthetic resin is less than 1 g / m 2 , the anti-slip property may not be exhibited sufficiently. On the other hand, when the embossing and the method of forming the unevenness by applying the synthetic resin are used in combination, if the applied amount of the synthetic resin exceeds 15 g / m 2 , the embossed uneven portion of the outermost surface is buried, and the slip resistance is reduced. May be difficult to demonstrate. Furthermore, the anti-slip property can be further improved by mixing the synthetic resin with foamed resin such as thermally foamable microcapsules or hollow microspheres.
本発明の建築下地用防水シートの総目付は１００ｇ／ｍ２〜７００ｇ／ｍ２が好ましく、より好ましくは２００ｇ／ｍ２〜４００ｇ／ｍ２である。１００ｇ／ｍ２より軽いと、施工の際、風の影響を受けシートが煽られやすく、施工性が悪くなるおそれがあり、また、６００ｇ／ｍ２より重いと高所の運搬がしにくく、施工性が悪くなるおそれがある。
また、本発明の建築下地用防水シートの総厚みは２００μｍ〜１０００μｍが好ましい。総厚みが２００μｍ未満であると、防水シートとしての十分な強度が得られないおそれがある。また１０００μｍを超えると、防水シートを曲げにくく、施工性が悪くなるおそれがある。
The total basis weight of the waterproof sheet for building foundation of the present invention is preferably 100g / m 2 ~700g / m 2 , more preferably from 200g / m 2 ~400g / m 2 . If it is lighter than 100 g / m 2, the sheet may be easily damaged by the wind during construction, and the workability may be deteriorated. If it is heavier than 600 g / m 2, it is difficult to carry high places. May be worse.
Moreover, the total thickness of the waterproof sheet for building foundations of the present invention is preferably 200 μm to 1000 μm. If the total thickness is less than 200 μm, sufficient strength as a waterproof sheet may not be obtained. On the other hand, if it exceeds 1000 μm, the waterproof sheet is difficult to bend and the workability may be deteriorated.
以下に述べる実施例、比較例によって本発明の建築下地用防水シートを具体的に説明するが、本発明はこれらに限定されるものではない。
The waterproofing sheet for architectural foundations of the present invention will be specifically described by the following examples and comparative examples, but the present invention is not limited to these.
＜測定方法および評価方法＞
１．樹脂の５％歪み時引張応力
＜測定方法＞
ＪＩＳ−Ｋ７１６１に準じて測定する。
２．屋根下地シートの釘穴止水性
＜測定方法＞
実施例、比較例の各試験シートをＪＩＳ−Ｓ６０３０規定の３号Ｕステープル釘（マックス株式会社製 Ｔ３−１０ＭＢ）で合板に打ち付けて固定し、その上に内径４ｃｍ高さ２００ｍｍのアクリル製円筒をステープル釘が円筒内径中心になるように立てて試験シートと接触している縁部分をシーリングした。次いで、ＪＩＳ−Ａ５４３０５．６および建築研究所法に準じた方法で、円筒の中に水を１５０ｍｍの高さまで入れ、２４時間後の減水の長さｍｍを測定する。
＜評価基準＞
◎ ５ｍｍ以下
○ ５ｍｍ超、１０ｍｍ以下
△ １０ｍｍ超、１５ｍｍ以下
× １５ｍｍ超
３．屋根下地シートの引張強度
＜測定方法＞
ＪＩＳ−Ａ６１１１に準じて測定する。
４．施工性
＜測定方法＞
４．５寸勾配の実験屋根模型において、各試験シートの施工性を官能的に評価する。
＜評価基準＞
○ カーリングによる巻き戻りがなく、且つ、軽量であるため運搬も容易である。
△ カーリングによる巻き戻りが見られるが、軽量であるため運搬が容易である。
× 重量であるため運搬が困難で施工しにくい。
５．屋根下地シートの長期耐久性
＜測定方法＞
各試験シートを９０℃の恒温乾燥機の中に入れ、６０日間放置した。
（１）釘穴止水性、（２）引張強度の保持率を評価し、初期性能と比較して耐久性の確認をする。
（１）釘穴止水性
上記記載の屋根下地シートの釘穴止水性の＜測定方法＞と同様に測定する。
＜評価基準＞
◎ ５ｍｍ以下
○ ５ｍｍ超、１０ｍｍ以下
△ １０ｍｍ超、１５ｍｍ以下
× １５ｍｍ超
（２）引張強度の保持率
処理後の各試験シートをＪＩＳ−Ａ６１１１に準じて引張強度を測定し、初期の引張強度と比較し保持率を確認する。
<Measurement method and evaluation method>
1. Tensile stress at 5% strain of resin <Measurement method>
Measured according to JIS-K7161.
2. Nail hole water resistance of roof base sheet <Measurement method>
Each test sheet of the example and the comparative example is fixed to a plywood by JIS-S6030 No. 3 U staple nail (T3-10MB, manufactured by Max Co., Ltd.), and an acrylic cylinder having an inner diameter of 4 cm and a height of 200 mm is fixed thereon. The edge portion in contact with the test sheet was sealed so that the staple nail was centered on the inner diameter of the cylinder. Subsequently, water is put in a cylinder to a height of 150 mm by a method according to JIS-A 54305.6 and the Building Research Institute method, and the length mm of water reduction after 24 hours is measured.
<Evaluation criteria>
◎ 5mm or less ○ More than 5mm, 10mm or less △ More than 10mm, 15mm or less × More than 15mm
3. Tensile strength of roof base sheet <Measurement method>
Measured according to JIS-A6111.
4). Workability <Measurement method>
In a 4.5-inch gradient experimental roof model, the workability of each test sheet is evaluated sensuously.
<Evaluation criteria>
○ There is no rewinding due to curling, and it is lightweight and easy to carry.
△ Rewinding due to curling can be seen, but it is lightweight and easy to carry.
× Since it is heavy, it is difficult to transport and difficult to install.
5. Long-term durability of roof base sheet <Measurement method>
Each test sheet was placed in a constant temperature dryer at 90 ° C. and left for 60 days.
(1) Evaluate the nail hole waterstop, (2) Tensile strength retention, and confirm the durability compared to the initial performance.
(1) Nail-hole water-stopping property Measured in the same manner as in the <Measurement method> for the nail-hole water-stopping property of the roof base sheet described above.
<Evaluation criteria>
◎ 5mm or less ○ More than 5mm, 10mm or less △ More than 10mm, 15mm or less × More than 15mm
(2) Tensile strength retention The tensile strength of each treated test sheet is measured according to JIS-A6111, and compared with the initial tensile strength to confirm the retention.
以下に、実施例、比較例、参考例を述べる。
［参考例１］
目付１００ｇ／ｍ２のポリエステル不織布（ＳＨＩＮＩＨ ＥＮＴＥＲＰＲＩＳＥ ＣＯ．，ＬＴＤ．製 ＶｅｒＤｕｒａ ＰＥＴ１００ＧＳＬ）の屋根葺材側にＴダイ押出法によって製膜した５％歪み時引張応力が０．６ＭＰａのエチレン酢酸ビニル（三井・デュポン ポリケミカル株式会社製）で５０μｍ厚の樹脂層１ａをラミネートした、２層構造からなる厚さ２４２μｍ、目付１４８ｇ／ｍ２の屋根下地シートを得た。評価結果を表１に示す。
Examples, comparative examples , and reference examples will be described below.
[ Reference Example 1]
Polyethylene non-woven fabric with a basis weight of 100 g / m2 (Verdura PET100GSL manufactured by SHINIH ENTERPRISE CO., LTD.) Formed by T-die extrusion method on the side of roof roofing material. A roof base sheet having a thickness of 242 μm and a weight per unit area of 148 g / m 2 obtained by laminating a resin layer 1a having a thickness of 50 μm by Polychemical Co., Ltd. was obtained. The evaluation results are shown in Table 1.
［参考例２］
樹脂層１ａを５％歪み時引張応力が１．７ＭＰａのエチレン酢酸ビニル（三井・デュポン ポリケミカル株式会社製）で５０μｍ厚のものに変更した以外は参考例１と同様に加工した、２層構造からなる厚さ２４２μｍ、目付１４８ｇ／ｍ２の屋根下地シートを得た。評価結果を表１に示す。
[ Reference Example 2]
Two-layer structure processed in the same manner as in Reference Example 1 except that the resin layer 1a is changed to 50 μm thick with ethylene vinyl acetate (Mitsui DuPont Polychemical Co., Ltd.) having a tensile stress at 5% strain of 1.7 MPa. A roof base sheet having a thickness of 242 μm and a basis weight of 148 g / m 2 was obtained. The evaluation results are shown in Table 1.
［参考例３］
樹脂層１ａを５％歪み時引張応力が５．０ＭＰａのポリエチレン（日本ポリエチレン株式会社製）で５０μｍ厚のものに変更した以外は参考例１と同様に加工した、２層構造からなる厚さ２４２μｍ、目付１４８ｇ／ｍ２の屋根下地シートを得た。評価結果を表１に示す。
[ Reference Example 3]
Thickness 242 μm consisting of a two-layer structure processed in the same manner as in Reference Example 1 except that the resin layer 1 a was changed to a 50 μm-thick polyethylene (made by Nippon Polyethylene Co., Ltd.) having a tensile stress at 5.0% strain of 5.0 MPa. A roof base sheet having a basis weight of 148 g / m 2 was obtained. The evaluation results are shown in Table 1.
［参考例４］
樹脂層１ａを５％歪み時引張応力が１．７ＭＰａのエチレン酢酸ビニル（三井・デュポン ポリケミカル株式会社製）で１２０μｍ厚のものに変更した以外は参考例１と同様に加工した、２層構造からなる厚さ３１２μｍ、目付２１４ｇ／ｍ２の屋根下地シートを得た。評価結果を表１に示す。
[ Reference Example 4]
A two-layer structure processed in the same manner as in Reference Example 1 except that the resin layer 1a is changed to 120 μm thick with ethylene vinyl acetate (manufactured by Mitsui DuPont Polychemical Co., Ltd.) having a tensile stress at 5% strain of 1.7 MPa. A roof base sheet having a thickness of 312 μm and a basis weight of 214 g / m 2 was obtained. The evaluation results are shown in Table 1.
［参考例５］
目付１００ｇ／ｍ２のポリエステル不織布（ＳＨＩＮＩＨ ＥＮＴＥＲＰＲＩＳＥ ＣＯ．，ＬＴＤ．製 ＶｅｒＤｕｒａ ＰＥＴ１００ＧＳＬ）の屋根葺材側にＴダイ押出法によって製膜した、５％歪み時引張応力が１．７ＭＰａのエチレン酢酸ビニル（三井・デュポン ポリケミカル株式会社製）で５０μｍ厚の樹脂層１ａと厚みが４０μｍの直鎖状低密度ポリエチレンフィルム（林一二株式会社製 Ｌ２００ 梨地 ブラック）からなる保護フィルム３をサンドラミネートした、３層構造からなる厚さ２８２μｍ、目付１８５ｇ／ｍ２の屋根下地シートを得た。評価結果を表１に示す。
[ Reference Example 5]
Polyethylene non-woven fabric with a basis weight of 100 g / m2 (VerDura PET100GSL manufactured by SHINIH ENTERPRISE CO., LTD.) Was formed by T-die extrusion on the roofing material side, and ethylene vinyl acetate with a 5% strain tensile stress of 1.7 MPa (Mitsui A three-layer structure in which a protective film 3 made of a resin layer 1a having a thickness of 50 μm and a linear low-density polyethylene film having a thickness of 40 μm (L200 Nashiji, manufactured by Hayashi Koji Co., Ltd.) is sand-laminated by DuPont Polychemical Co., Ltd. A roof base sheet having a thickness of 282 μm and a basis weight of 185 g / m 2 was obtained. The evaluation results are shown in Table 1.
［参考例６］
樹脂層１ａを５％歪み時引張応力が１．７ＭＰａのエチレン酢酸ビニル（三井・デュポン ポリケミカル株式会社製）で１２０μｍ厚のものに変更した以外は参考例５と同様に加工した、３層構造からなる厚さ３５２μｍ、目付２５１ｇ／ｍ２の屋根下地シートを得た。評価結果を表１に示す。
[ Reference Example 6]
A three-layer structure processed in the same manner as in Reference Example 5 except that the resin layer 1a was changed to 120 μm thick with ethylene vinyl acetate (Mitsui DuPont Polychemical Co., Ltd.) having a tensile stress at 5% strain of 1.7 MPa. A roof base sheet having a thickness of 352 μm and a basis weight of 251 g / m 2 was obtained. The evaluation results are shown in Table 1.
［参考例７］
目付１００ｇ／ｍ２のポリエステル不織布（ＳＨＩＮＩＨ ＥＮＴＥＲＰＲＩＳＥ ＣＯ．，ＬＴＤ．製 ＶｅｒＤｕｒａ ＰＥＴ１００ＧＳＬ）の屋根葺材側にＴダイ押出法によって製膜した５％歪み時引張応力が１．７ＭＰａのエチレン酢酸ビニル（三井・デュポン ポリケミカル株式会社製）で５０μｍ厚の樹脂層１ａをラミネートした。また、不織布の野地板側に同じくＴダイ押出法によって製膜した、５％歪み時引張応力が１．７ＭＰａのエチレン酢酸ビニル（三井・デュポン ポリケミカル株式会社製）で５０μｍ厚の樹脂層１ｂをラミネートした、３層構造からなる厚さ２９０μｍ、目付１９６ｇ／ｍ２の屋根下地シートを得た。評価結果を表１に示す。
[ Reference Example 7]
Polyethylene non-woven fabric with a basis weight of 100 g / m2 (Verdura PET100GSL manufactured by SHINIH ENTERPRISE CO., LTD.) Formed by T-die extrusion method on the roofing material side of ethylene vinyl acetate (Mitsui, Dupont) A resin layer 1a having a thickness of 50 μm was laminated by Polychemical Co., Ltd. In addition, a 50 μm thick resin layer 1b was formed with ethylene vinyl acetate (manufactured by Mitsui DuPont Polychemical Co., Ltd.) having a tensile stress at 5% strain of 1.7 MPa, which was formed on the non-woven fabric base plate side by the T-die extrusion method. A laminated roof base sheet having a laminated three-layer structure thickness of 290 μm and a basis weight of 196 g / m 2 was obtained. The evaluation results are shown in Table 1.
［実施例８］
樹脂層１ａを５％歪み時引張応力が１．７ＭＰａのエチレン酢酸ビニル（三井・デュポン ポリケミカル株式会社製）で１２０μｍ厚のものに変更し、そして、樹脂層１ｂを５％歪み時引張応力が１．７ＭＰａのエチレン酢酸ビニル（三井・デュポン ポリケミカル株式会社製）で１２０μｍ厚のものに変更した以外は参考例７と同様に加工した、３層構造からなる厚さ４２９μｍ、目付３２８ｇ／ｍ２の屋根下地シートを得た。評価結果を表１に示す。
[Example 8]
The resin layer 1a was changed to a 120 μm thick ethylene vinyl acetate (made by Mitsui DuPont Polychemical Co., Ltd.) having a tensile stress of 1.7 MPa at 5% strain, and the tensile stress at 5% strain was changed to the resin layer 1b. A thickness of 429 μm consisting of a three-layer structure processed in the same manner as in Reference Example 7 except that the thickness was changed to 120 μm with 1.7 MPa ethylene vinyl acetate (Mitsui DuPont Polychemical Co., Ltd.), and the basis weight was 328 g / m 2. The roof base sheet was obtained. The evaluation results are shown in Table 1.
［実施例９］
樹脂層１ａを５％歪み時引張応力が１．７ＭＰａのエチレン酢酸ビニル（三井・デュポン ポリケミカル株式会社製）で２４０μｍ厚のものに変更し、そして、樹脂層１ｂを５％歪み時引張応力が１．７ＭＰａのエチレン酢酸ビニル（三井・デュポン ポリケミカル株式会社製）で２４０μｍ厚のものに変更した以外は参考例７と同様に加工した、３層構造からなる厚さ６６９μｍ、目付５６２ｇ／ｍ２の屋根下地シートを得た。評価結果を表１に示す。
[Example 9]
The resin layer 1a was changed to 240 μm thick with ethylene vinyl acetate (Mitsui DuPont Polychemical Co., Ltd.) having a tensile stress of 1.7 MPa at 5% strain, and the tensile stress at 5% strain was changed to the resin layer 1b. A thickness of 669 μm consisting of a three-layer structure processed in the same manner as in Reference Example 7 except that it was changed to a thickness of 240 μm with 1.7 MPa ethylene vinyl acetate (manufactured by Mitsui DuPont Polychemical Co., Ltd.), and a basis weight of 562 g / m 2. The roof base sheet was obtained. The evaluation results are shown in Table 1.
［参考例１０］
目付１００ｇ／ｍ２のポリエステル不織布（ＳＨＩＮＩＨ ＥＮＴＥＲＰＲＩＳＥ ＣＯ．，ＬＴＤ．製 ＶｅｒＤｕｒａ ＰＥＴ１００ＧＳＬ）の屋根葺材側にＴダイ押出法によって製膜した、５％歪み時引張応力が１．７ＭＰａのエチレン酢酸ビニル（三井・デュポン ポリケミカル株式会社製）で５０μｍ厚の樹脂層１ａと厚みが４０μｍの直鎖状低密度ポリエチレンフィルム（林一二株式会社製 Ｌ２００ 梨地 ブラック）からなる保護フィルム３をサンドラミネートした。また、不織布の野地板側に同じくＴダイ押出法によって製膜した、５％歪み時引張応力が１．７ＭＰａのエチレン酢酸ビニル（三井・デュポン ポリケミカル株式会社製）で９０μｍ厚の樹脂層１ｂをラミネートした、４層構造からなる厚さ３７０μｍ、目付２７０ｇ／ｍ２の屋根下地シートを得た。評価結果を表１に示す。
[ Reference Example 10]
Polyethylene non-woven fabric with a basis weight of 100 g / m2 (VerDura PET100GSL manufactured by SHINIH ENTERPRISE CO., LTD.) Was formed by T-die extrusion on the roofing material side, and ethylene vinyl acetate with a 5% strain tensile stress of 1.7 MPa (Mitsui A protective film 3 made of a resin layer 1a having a thickness of 50 μm and a linear low density polyethylene film having a thickness of 40 μm (L200 Nashiji, manufactured by Hayashi Koji Co., Ltd.) was sand-laminated by DuPont Polychemical Co., Ltd. Also, a 90 μm-thick resin layer 1b is formed with ethylene vinyl acetate (made by Mitsui DuPont Polychemical Co., Ltd.) having a tensile stress of 1.7 MPa at 5% strain formed on the non-woven fabric base plate side by the T-die extrusion method. A laminated roof base sheet having a laminated thickness of 370 μm and a basis weight of 270 g / m 2 was obtained. The evaluation results are shown in Table 1.
［実施例１１］
樹脂層１ａを５％歪み時引張応力が１．７ＭＰａのエチレン酢酸ビニル（三井・デュポン ポリケミカル株式会社製）で１２０μｍ厚のものに変更し、そして、樹脂層１ｂを５％歪み時引張応力が１．７ＭＰａのエチレン酢酸ビニル（三井・デュポン ポリケミカル株式会社製）で１６０μｍ厚のものに変更した以外は参考例１０と同様に加工した、３層構造からなる厚さ５０９μｍ、目付４０２ｇ／ｍ２の屋根下地シートを得た。評価結果を表１に示す。
[Example 11]
The resin layer 1a was changed to a 120 μm thick ethylene vinyl acetate (made by Mitsui DuPont Polychemical Co., Ltd.) having a tensile stress of 1.7 MPa at 5% strain, and the tensile stress at 5% strain was changed to the resin layer 1b. A thickness of 509 μm consisting of a three-layer structure processed in the same manner as in Reference Example 10 except that the thickness was changed to 160 μm thick with 1.7 MPa ethylene vinyl acetate (manufactured by Mitsui DuPont Polychemical Co., Ltd.), and the basis weight was 402 g / m 2. The roof base sheet was obtained. The evaluation results are shown in Table 1.
［実施例１２］
樹脂層１ａを５％歪み時引張応力が１．７ＭＰａのエチレン酢酸ビニル（三井・デュポン ポリケミカル株式会社製）で２４０μｍ厚のものに変更し、そして、樹脂層１ｂを５％歪み時引張応力が１．７ＭＰａのエチレン酢酸ビニル（三井・デュポン ポリケミカル株式会社製）で２８０μｍ厚のものに変更した以外は参考例１０と同様に加工した、４層構造からなる厚さ７４９μｍ、目付６３６ｇ／ｍ２の屋根下地シートを得た。評価結果を表１に示す。
[Example 12]
The resin layer 1a was changed to 240 μm thick with ethylene vinyl acetate (Mitsui DuPont Polychemical Co., Ltd.) having a tensile stress of 1.7 MPa at 5% strain, and the tensile stress at 5% strain was changed to the resin layer 1b. A 7-layer thickness of 749 μm and a basis weight of 636 g / m 2 processed in the same manner as in Reference Example 10 except that the thickness is changed to a thickness of 280 μm with 1.7 MPa ethylene vinyl acetate (Mitsui DuPont Polychemical Co., Ltd.). The roof base sheet was obtained. The evaluation results are shown in Table 1.
［比較例１］
目付１００ｇ／ｍ２のポリエステル不織布（ＳＨＩＮＩＨ ＥＮＴＥＲＰＲＩＳＥ ＣＯ．，ＬＴＤ．製 ＶｅｒＤｕｒａ ＰＥＴ１００ＧＳＬ）の屋根葺材側にＴダイ押出法によって製膜した、５％歪み時引張応力が０．３ＭＰａのエチレン酢酸ビニル（三井・デュポン ポリケミカル株式会社製）で２４０μｍ厚の樹脂層１ａをラミネートし、２層構造からなる厚さ４３２μｍ、目付３３０ｇ／ｍ２の屋根下地シートを得た。評価結果を表１に示す。
［比較例２］
目付１００ｇ／ｍ２のポリエステル不織布（ＳＨＩＮＩＨ ＥＮＴＥＲＰＲＩＳＥ ＣＯ．，ＬＴＤ．製 ＶｅｒＤｕｒａ ＰＥＴ１００ＧＳＬ）の屋根葺材側にＴダイ押出法によって製膜した、５％歪み時引張応力が６．９ＭＰａのポリエチレン（日本ポリエチレン株式会社製）で２４０μｍ厚の樹脂層１ａをラミネートし、２層構造からなる厚さ４３２μｍ、目付３３０ｇ／ｍ２の屋根下地シートを得た。評価結果を表１に示す。
[Comparative Example 1]
Polyethylene non-woven fabric with a basis weight of 100 g / m 2 (Verdura PET100GSL manufactured by SHINIH ENTERPRISE CO., LTD.) Formed by T-die extrusion method on the roofing material side, ethylene vinyl acetate with a tensile stress of 0.3 MPa at 5% strain (Mitsui The resin layer 1a having a thickness of 240 μm was laminated by DuPont Polychemical Co., Ltd. to obtain a roof base sheet having a thickness of 432 μm and a basis weight of 330 g / m 2 having a two-layer structure. The evaluation results are shown in Table 1.
[Comparative Example 2]
Polyethylene (Nippon Polyethylene Co., Ltd.) having a tensile stress of 6.9 MPa at 5% strain formed by a T-die extrusion method on the roof side of a polyester non-woven fabric (SHINIH ENTERPRISE CO., LTD. VerDura PET100GSL) with a basis weight of 100 g / m 2 The resin layer 1a having a thickness of 240 μm was laminated to obtain a roof base sheet having a thickness of 432 μm and a basis weight of 330 g / m 2 . The evaluation results are shown in Table 1.
［比較例３］
ＪＩＳ Ａ６００５に規定されるアスファルトルーフィング９４０（田嶋応用化工株式会社製 Ｐカラー）の評価結果を表１に示す。
[Comparative Example 3]
Table 1 shows the evaluation results of asphalt roofing 940 (P color, manufactured by Tajima Kappa Kako Co., Ltd.) defined in JIS A6005.
１ａ 屋根葺材側の樹脂層
１ｂ 野地板側の樹脂層
２ 補強シート
３ 保護フィルム
1a Resin layer 1b on roof roof material side Resin layer 2 on base plate side Reinforcement sheet 3 Protective film
Claims (2)
補強シートの屋根葺材側に、第１の樹脂層が積層されており、
第１の樹脂層に用いられる熱可塑性樹脂の５％歪み時引張応力が０．５ＭＰａ〜６．０ＭＰａであり、かつ、
補強シートの野地板側に、第２の樹脂層が積層されており、
第２の樹脂層に用いられる熱可塑性樹脂の５％歪み時引張応力が０．５ＭＰａ〜６．０ＭＰａであり、
第１の樹脂層の厚みが６０μｍ〜２５０μｍであり、
第１の樹脂層の厚みに対する第２の樹脂層の厚みの比率が、０．５〜１．６である
ことを特徴とする建築下地用防水シート。 A waterproof sheet for building foundations having a multilayer structure consisting of at least two layers in which a resin is laminated on the roofing material side of the reinforcing sheet,
The first resin layer is laminated on the roof covering material side of the reinforcing sheet,
5% strain at a tensile stress of the thermoplastic resin used for the first resin layer is Ri 0.5MPa~6.0MPa der, and
The second resin layer is laminated on the base plate side of the reinforcing sheet,
The thermoplastic resin used for the second resin layer has a tensile stress at 5% strain of 0.5 MPa to 6.0 MPa,
The thickness of the first resin layer is 60 μm to 250 μm,
The waterproof sheet for building foundations , wherein the ratio of the thickness of the second resin layer to the thickness of the first resin layer is 0.5 to 1.6 .
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| JPH02269277A (en) * | 1989-04-11 | 1990-11-02 | Toyobo Co Ltd | Under-roof shingling material |
| JP3014653B2 (en) * | 1997-02-04 | 2000-02-28 | 恵和株式会社 | Building sheets, roof tarpaulins and airtight sheets for walls |
| JP2001150582A (en) * | 1999-11-26 | 2001-06-05 | Toyo Tire & Rubber Co Ltd | Waterproof laminated sheet |
| JP5250176B2 (en) * | 2004-03-05 | 2013-07-31 | 正三郎 角 | Metallic decorative sheet, decorative metal plate |
| JP2005307574A (en) * | 2004-04-22 | 2005-11-04 | Okura Ind Co Ltd | Mortar outer wall lathing sheet |
| JP4639080B2 (en) * | 2004-12-24 | 2011-02-23 | セーレン株式会社 | Waterproofing roof |
| JP5570093B2 (en) * | 2007-09-28 | 2014-08-13 | セーレン株式会社 | Waterproof sheet for building foundation |
| JP5934096B2 (en) * | 2010-08-25 | 2016-06-15 | セーレン株式会社 | Roof base sheet and manufacturing method thereof |
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