JP2017213721A - Laminate sheet and manufacturing method therefor - Google Patents
Laminate sheet and manufacturing method therefor Download PDFInfo
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- JP2017213721A JP2017213721A JP2016107687A JP2016107687A JP2017213721A JP 2017213721 A JP2017213721 A JP 2017213721A JP 2016107687 A JP2016107687 A JP 2016107687A JP 2016107687 A JP2016107687 A JP 2016107687A JP 2017213721 A JP2017213721 A JP 2017213721A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 230000035699 permeability Effects 0.000 claims abstract description 33
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 29
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 29
- 239000000758 substrate Substances 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 24
- 230000003746 surface roughness Effects 0.000 claims description 6
- 238000007127 saponification reaction Methods 0.000 claims description 5
- 238000000576 coating method Methods 0.000 abstract description 4
- 238000001035 drying Methods 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000010030 laminating Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 63
- 239000007864 aqueous solution Substances 0.000 description 15
- 239000000463 material Substances 0.000 description 11
- 238000000034 method Methods 0.000 description 6
- 238000003475 lamination Methods 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- 229920000098 polyolefin Polymers 0.000 description 4
- 239000004952 Polyamide Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 239000004745 nonwoven fabric Substances 0.000 description 3
- 229920002647 polyamide Polymers 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229920001410 Microfiber Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 238000000635 electron micrograph Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000004775 Tyvek Substances 0.000 description 1
- 229920000690 Tyvek Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 210000000038 chest Anatomy 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 229920006381 polylactic acid film Polymers 0.000 description 1
- 229920006124 polyolefin elastomer Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 229920006264 polyurethane film Polymers 0.000 description 1
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Landscapes
- Building Environments (AREA)
- Laminated Bodies (AREA)
Abstract
Description
本発明は、積層シートおよびその製造方法に関するものである。 The present invention relates to a laminated sheet and a method for producing the same.
従来、住宅の室内の気密性を高め、冷暖房効率を高めるために壁内にシートを配置している。そのシートにおいて、壁内の結露防止の機能を持たせた積層シートが開発されている。たとえば、下記の特許文献１は吸放湿層および透湿粘着層、透湿層、表面層を備えた積層シートを開示している。特許文献１の積層シートの吸放湿層は、ポリビニルアルコールをフィルム状に製造してから他の層と貼りあわせて使用している。 Conventionally, a seat is arranged in a wall in order to improve the airtightness of a room in a house and to increase the efficiency of air conditioning. In the sheet, a laminated sheet having a function of preventing condensation in the wall has been developed. For example, Patent Document 1 below discloses a laminated sheet including a moisture absorbing / releasing layer, a moisture permeable adhesive layer, a moisture permeable layer, and a surface layer. The moisture-absorbing / releasing layer of the laminated sheet of Patent Document 1 is used by bonding polyvinyl alcohol to other layers after producing polyvinyl alcohol in the form of a film.
しかし、特許文献１の方法で積層シートを製造すると、ポリビニルアルコールのみでフィルム状にする必要が生じ、その厚みが厚くなる。たとえば特許文献１の段落００５６に記載される製造例では、ポリビニルアルコールの層厚が５０μｍになっている。ポリビニルアルコールを厚くすると、必要な材料が多くなり、材料コストも上がる。ポリビニルアルコールを必要以上に厚くすると、ポリビニルアルコールが吸湿と放湿を繰り返すうちに、積層シートが収縮する恐れもある。 However, when a laminated sheet is produced by the method of Patent Document 1, it is necessary to form a film with only polyvinyl alcohol, and the thickness becomes thick. For example, in the production example described in paragraph 0056 of Patent Document 1, the layer thickness of polyvinyl alcohol is 50 μm. When the polyvinyl alcohol is thickened, more materials are required and the material cost is increased. If the polyvinyl alcohol is made thicker than necessary, the laminated sheet may shrink while the polyvinyl alcohol repeatedly absorbs and releases moisture.
本発明の目的は、安価で製造が容易であり、変形しにくい積層シートおよびその製造方法を提供することにある。 An object of the present invention is to provide a laminated sheet that is inexpensive, easy to manufacture, and hardly deformed, and a method for manufacturing the same.
本発明の積層シートは、透湿性の基材シートと、前記基材シートに積層され、ポリビニルアルコールからなる透湿吸水層を備える。前記透湿吸水層は、層厚が３．５μｍ以上、ＪＩＳ Ｐ８１１７における王研式透気度が９９９９９秒／１００ｍｌ以上、気温２５℃、湿度５０％におけるＪＩＳ Ａ１３２４の透湿抵抗が３００ｍ２・ｈ・ｍｍＨｇ／ｇ以上である。 The laminated sheet of the present invention comprises a moisture-permeable base sheet and a moisture-permeable water-absorbing layer laminated on the base sheet and made of polyvinyl alcohol. The moisture-permeable water-absorbing layer has a layer thickness of 3.5 μm or more, JIS P8117 Oken-type air permeability of 99999 seconds / 100 ml or more, JIS A1324 moisture permeability resistance of 300 m 2 · h at a temperature of 25 ° C. and a humidity of 50%. -It is mmHg / g or more.
本発明の積層シートの製造方法は、透湿性の基材シートを準備する工程と、ポリビニルアルコールを含む溶液で前記基材シートの表面を覆う工程と、前記溶液を乾燥させ、層厚が３．５μｍ以上、ＪＩＳ Ｐ８１１７における王研式透気度が９９９９９秒／１００ｍｌ以上、気温２５℃、湿度５０％におけるＪＩＳ Ａ１３２４の透湿抵抗が３００ｍ２・ｈ・ｍｍＨｇ／ｇ以上であるポリビニルアルコールからなる透湿吸水層を形成する工程とを備える。 The method for producing a laminated sheet of the present invention comprises a step of preparing a moisture-permeable base sheet, a step of covering the surface of the base sheet with a solution containing polyvinyl alcohol, drying the solution, and a layer thickness of 3. Permeability made of polyvinyl alcohol having 5 μm or more, Oken-type air permeability in JIS P8117 of 99999 seconds / 100 ml or more, JIS A1324 moisture resistance of 300 m 2 · h · mmHg / g or more at a temperature of 25 ° C. and a humidity of 50%. Forming a moisture-absorbing layer.
本発明によると、ポリビニルアルコールからなる透湿吸水層を直接基材シートの上に形成しており、透湿吸水層を薄くできる。透湿吸水層が薄くなることで、材料を少なくすることができ、積層シートを安価にできる。透湿吸水層を単独で製造することが無いので、製造も容易である。透湿吸水層が薄くなるため、積層シートの変形を防止できる。 According to the present invention, the moisture-permeable water-absorbing layer made of polyvinyl alcohol is formed directly on the base sheet, and the moisture-permeable water-absorbing layer can be thinned. Since the moisture-permeable water-absorbing layer becomes thin, the material can be reduced and the laminated sheet can be made inexpensive. Since the moisture-permeable water-absorbing layer is not produced alone, the production is easy. Since the moisture-permeable water-absorbing layer becomes thin, deformation of the laminated sheet can be prevented.
本発明の積層シートおよびその製造方法について図面を使用して説明する。積層シートが壁または床、天井などの建材、特に壁体内結露防止シートとして使用された場合を例に説明する。 The laminated sheet of the present invention and the manufacturing method thereof will be described with reference to the drawings. A case where the laminated sheet is used as a building material such as a wall, a floor, or a ceiling, particularly as a dew condensation prevention sheet in a wall will be described as an example.
図１に示す本発明の積層シート１０は透湿性の基材シート１２に透湿吸水層１４を積層したものである。透湿吸水層１４は、基材シート１２の一方の面に積層されても良いし、両方の面に積層されても良い。 A laminated sheet 10 of the present invention shown in FIG. 1 is obtained by laminating a moisture permeable and water absorbing layer 14 on a moisture permeable base sheet 12. The moisture permeable and water absorbing layer 14 may be laminated on one surface of the substrate sheet 12 or may be laminated on both surfaces.
基材シート１２は透湿性を備えたシートである。基材シート１２のＪＩＳ Ａ１３２４の透湿抵抗は、３ｍ２・ｈ・ｍｍＨｇ／ｇ以下、好ましくは１．３５ｍ２・ｈ・ｍｍＨｇ／ｇ以下、さらに好ましくは０．２７ｍ２・ｈ・ｍｍＨｇ／ｇ以下であり、下限は特に限定されない。基材シート１２は非常に高い透湿性を有し、透湿吸水層１４は単独で存在することと同じ状態である。上記透湿抵抗であれば基材シート１２の厚みは限定されない。透湿抵抗が１．３５ｍ２・ｈ・ｍｍＨｇ／ｇ以下であれば積層シート１０を屋根用のシートとして好適に使用でき、０．２７ｍ２・ｈ・ｍｍＨｇ／ｇ以下であれば積層シート１０を壁用のシートとして好適に使用できる。 The base sheet 12 is a sheet having moisture permeability. The moisture permeability resistance of JIS A1324 of the base sheet 12 is 3 m 2 · h · mmHg / g or less, preferably 1.35 m 2 · h · mmHg / g or less, more preferably 0.27 m 2 · h · mmHg / g. The lower limit is not particularly limited. The base sheet 12 has very high moisture permeability, and the moisture permeable and water absorbing layer 14 is in the same state as existing alone. If it is the said moisture-permeable resistance, the thickness of the base material sheet 12 will not be limited. If the moisture permeability resistance is 1.35 m 2 · h · mmHg / g or less, the laminated sheet 10 can be suitably used as a roof sheet, and if it is 0.27 m 2 · h · mmHg / g or less, the laminated sheet 10 is used. It can be suitably used as a wall sheet.
基材シート１２はポリオレフィン微多孔フィルムまたはポリオレフィンエラストマーフィルム、ポリスチレンフィルム、ポリエステルフィルム、ポリエステルエラストマーフィルム、ポリアミドフィルム、ポリウレタンフィルム、ポリウレタン微多孔フィルム、ポリウレタンエラストマーフィルム、ポリビニルアルコールフィルム、セルロースフィルム、ポリ乳酸フィルムが挙げられる。たとえばポリオレフィン微多孔フィルムは、ポリオレフィンに炭酸カルシウムを混合してフィルム状にしたり、繊維状のポリオレフィンをランダムにまとめて表面が平らになるように圧縮してフィルム状にしたりすることで製造できる。 The substrate sheet 12 is a polyolefin microporous film or polyolefin elastomer film, polystyrene film, polyester film, polyester elastomer film, polyamide film, polyurethane film, polyurethane microporous film, polyurethane elastomer film, polyvinyl alcohol film, cellulose film, or polylactic acid film. Can be mentioned. For example, a polyolefin microporous film can be produced by mixing a polyolefin with calcium carbonate to form a film, or by randomly combining fibrous polyolefins and compressing them so that the surface is flattened to form a film.
基材シート１２は上記のシートに限定されず、極細繊維の積層体や、透湿性があれば膜であっても良い。極細繊維の積層体としては、ポリフッ化ビニリデンなどのフッ素化樹脂、またはポリエチレンやポリプロピレン、ポリエステル、ポリウレタン、ポリアミド、ポリビニルアルコールを用いた極細不織布が挙げられる。透湿性の膜としては、ポリテトラフルオロエチレンやポリアミド、ポリアミノ酸、ポリグルコースアミンのメンブレンが挙げられる。 The substrate sheet 12 is not limited to the above sheet, and may be a laminate of ultrafine fibers or a film if it has moisture permeability. Examples of the laminate of ultrafine fibers include fluorinated resins such as polyvinylidene fluoride, or ultrafine nonwoven fabrics using polyethylene, polypropylene, polyester, polyurethane, polyamide, and polyvinyl alcohol. Examples of moisture permeable membranes include polytetrafluoroethylene, polyamide, polyamino acid, and polyglucosamine membranes.
基材シート１２の表面は、表面粗さＲｚは２０μｍ以下、好ましくは５μｍ以下、さらに好ましくは３．５μｍ以下である。Ｒｚが２０μｍを超えると基材シート１２の表面の凹凸が大きくなるので、透湿吸水層１４を形成することが難しくなり、透湿吸水層１４の材料を多く使用する必要が生じ、好ましくない。表面粗さＲｚは透湿吸水層１４の厚みよりも小さければ良い。基材シート１２表面の凹凸は透湿吸水層１４の厚みよりも小さい。 The surface of the base sheet 12 has a surface roughness Rz of 20 μm or less, preferably 5 μm or less, more preferably 3.5 μm or less. If Rz exceeds 20 μm, the unevenness of the surface of the substrate sheet 12 becomes large, so that it becomes difficult to form the moisture-permeable and water-absorbing layer 14, and it is necessary to use a large amount of the material of the moisture-permeable and water-absorbing layer 14, which is not preferable. The surface roughness Rz only needs to be smaller than the thickness of the moisture permeable and water absorbing layer 14. The unevenness on the surface of the substrate sheet 12 is smaller than the thickness of the moisture permeable and water absorbing layer 14.
透湿吸水層１４はポリビニルアルコール（polyvinyl alcohol）で形成される。透湿吸水層１４の厚みは、３．５μｍ以上、３０μｍ以下、好ましくは５μｍ以上、２０μｍ以下である。積層シート１０を製造するときに、基材シート１２に直接透湿吸水層１４を形成することで、透湿吸水層１４の厚みを薄くできる。 The moisture permeable and water absorbing layer 14 is formed of polyvinyl alcohol. The thickness of the moisture permeable and water absorbing layer 14 is 3.5 μm or more and 30 μm or less, preferably 5 μm or more and 20 μm or less. When the laminated sheet 10 is manufactured, the moisture-permeable and water-absorbing layer 14 can be made thin by forming the moisture-permeable and water-absorbing layer 14 directly on the base sheet 12.
透湿吸水層１４の厚みが３．５μｍ未満であれば、気温２５℃、湿度５０％において透湿抵抗が３００ｍ２・ｈ・ｍｍＨｇ／ｇ以上にならない恐れがある。３００ｍ２・ｈ・ｍｍＨｇ／ｇ以上の透湿抵抗は、ＪＩＳ Ａ６９３０で規定され、断熱構造部の防露のために、別に防湿層を構成する際に必要とされる透湿抵抗である。透湿吸水層１４の厚みが２０μｍより厚くなると、透湿抵抗が高止まりし、それ以上厚くする必要が無くなる。さらに厚くなると膨張と収縮を繰り返すことで透湿吸水層１４が変形する恐れがある。 If the thickness of the moisture-permeable water-absorbing layer 14 is less than 3.5 μm, the moisture-permeable resistance may not be 300 m 2 · h · mmHg / g or more at a temperature of 25 ° C. and a humidity of 50%. The moisture permeability resistance of 300 m 2 · h · mmHg / g or more is defined by JIS A6930, and is a moisture permeability resistance required when a moisture-proof layer is formed separately for preventing the heat-insulating structure portion from dew. When the thickness of the moisture permeable and water absorbing layer 14 is greater than 20 μm, the moisture permeability resistance remains high, and it is not necessary to increase the thickness. When the thickness is further increased, the moisture permeable and water absorbing layer 14 may be deformed by repeating expansion and contraction.
透湿吸水層１４は、気温４０℃、湿度９０％における透湿抵抗が３ｍ２・ｈ・ｍｍＨｇ／ｇ以下である。透湿吸水層１４は、空気中に含まれる湿気が高い環境になれば透湿するようになっている。 The moisture-permeable and water-absorbing layer 14 has a moisture permeability resistance of 3 m 2 · h · mmHg / g or less at a temperature of 40 ° C. and a humidity of 90%. The moisture-permeable and water-absorbing layer 14 is designed to transmit moisture when the humidity contained in the air is high.
透湿吸水層１４の透気度は９９９９９秒／１００ｍｌ以上である。この透気度はＪＩＳ Ｐ８１１７に基づいた王研式透気度である。透湿吸水層１４は空気を通さないようになっているので、室内の気密性を高めることができる。 The air permeability of the moisture permeable and water absorbing layer 14 is 99999 seconds / 100 ml or more. This air permeability is the Oken type air permeability based on JIS P8117. Since the moisture-permeable and water-absorbing layer 14 does not allow air to pass therethrough, it is possible to improve indoor airtightness.
透湿吸水層１４は、たとえばポリビニルアルコールを含む水溶液１６を基材シート１２の上に塗工し、乾燥させることで形成できる。ポリビニルアルコールを含む水溶液１６としては、鹸化度が８７ｍｏｌ％以上、水溶液中のポリビニルアルコールが１〜５０％ｖｏｌに調整することが好ましく、さらには鹸化度が９７〜９９．９ｍｏｌ％、水溶液中のポリビニルアルコールが２〜２０％ｖｏｌに調整することがより好ましい。鹸化度が８７％よりも低いと、透湿吸水層１４が透湿性を発揮できない恐れがある。水溶液中のポリビニルアルコールの濃度が１％ｖｏｌよりも低いと、塗工に使用する水溶液１６の量が増大し、乾燥にも時間がかかるため、生産コストが上がる。逆に５０％ｖｏｌよりも高いと、粘度が増大するため、所望の膜厚に塗工を制御することが困難になる。 The moisture permeable and water absorbing layer 14 can be formed, for example, by applying an aqueous solution 16 containing polyvinyl alcohol on the base sheet 12 and drying it. As the aqueous solution 16 containing polyvinyl alcohol, the degree of saponification is preferably adjusted to 87 mol% or more, and the polyvinyl alcohol in the aqueous solution is preferably adjusted to 1 to 50% vol. Further, the degree of saponification is 97 to 99.9 mol%. More preferably, the alcohol is adjusted to 2 to 20% vol. If the degree of saponification is lower than 87%, the moisture permeable and water absorbing layer 14 may not exhibit moisture permeability. When the concentration of the polyvinyl alcohol in the aqueous solution is lower than 1% vol, the amount of the aqueous solution 16 used for coating increases, and it takes time to dry, resulting in an increase in production cost. On the other hand, if it is higher than 50% vol, the viscosity increases, so that it is difficult to control the coating to a desired film thickness.
上記の工程で透湿吸水層１４が所望の厚みに不足するならば、上記工程を複数回繰り返しも良い。ポリビニルアルコールをフィルム状に製造してから他の層と貼りあわせる従来の方法よりも、直接基材シート１２の上に透湿吸水層１４を形成することで、透湿吸水層１４の厚みを薄くすることができる。 If the moisture-permeable water-absorbing layer 14 is insufficient in a desired thickness in the above process, the above process may be repeated a plurality of times. Compared to the conventional method in which polyvinyl alcohol is produced in the form of a film and then pasted together with other layers, the moisture-permeable water-absorbing layer 14 is formed directly on the base sheet 12 so that the moisture-permeable water-absorbing layer 14 is made thinner. can do.
透湿吸水層１４を薄くすることにより、透湿吸水層１４のために使用する材料の量を少なくすることができ、積層シート１０を安価に製造することができる。透湿吸水層１４の厚みを薄くすることにより、積層シート１０が湿気の高い環境下で透湿する性能を発揮しやすくできる。透湿吸水層１４の厚みを薄くすることにより、吸放湿による変形を抑えることができる。 By thinning the moisture permeable water absorbing layer 14, the amount of material used for the moisture permeable water absorbing layer 14 can be reduced, and the laminated sheet 10 can be manufactured at low cost. By reducing the thickness of the moisture-permeable and water-absorbing layer 14, the laminated sheet 10 can easily exhibit the performance of moisture permeation in a high humidity environment. By reducing the thickness of the moisture-permeable and water-absorbing layer 14, deformation due to moisture absorption and release can be suppressed.
なお、基材シート１２の上に水溶液１６を塗工できれば、塗工方法は特に限定されない。たとえば、水溶液１６を基材シート１２に塗工する方法としては、バーコーター、グラビアコーター、ロールコーター、ダイコーター、スプレーコーター、ナイフコーター、ディップコーターなど、既知の方法を使用すれば良い。 In addition, if the aqueous solution 16 can be coated on the base material sheet 12, the coating method will not be specifically limited. For example, as a method of applying the aqueous solution 16 to the base sheet 12, a known method such as a bar coater, a gravure coater, a roll coater, a die coater, a spray coater, a knife coater, or a dip coater may be used.
[実施例]
基材シート１２と透湿吸水層１４として以下の材料を使用し、下記表１の積層シートＡ〜Ｈを得た。基材シート１２はポリエチレンの微多孔質フィルム（三菱樹脂社製、ＫＨ２０８５Ａ）を使用した。基材シート１２の表面粗さＲｚは２．５μｍであった。
[Example]
The following materials were used as the base sheet 12 and the moisture-permeable water-absorbing layer 14 to obtain laminated sheets A to H shown in Table 1 below. The substrate sheet 12 was a polyethylene microporous film (KH2085A, manufactured by Mitsubishi Plastics). The surface roughness Rz of the base sheet 12 was 2.5 μm.
透湿吸水層１４のポリビニルアルコールはクラレ社製のＲＳ−２１１７を使用した。このポリビニルアルコール水溶液１６を基材フィルム１２の上に滴下し（図２（ａ））、スクリーン捺染機（辻井染機工業社製、ＰＳ−５４０ＡＲＤ）のローラー１８で水溶液１６を押し広げ（図２（ｂ））、８０℃の雰囲気で２分間乾燥させて、積層シート１０を得た（図２（ｃ））。水溶液１６の鹸化度は９７．５〜９９ｍｏｌ％、ポリビニルアルコールは５％ｖｏｌであった。 As the polyvinyl alcohol of the moisture permeable and water absorbing layer 14, RS-2117 manufactured by Kuraray Co., Ltd. was used. The polyvinyl alcohol aqueous solution 16 is dropped on the base film 12 (FIG. 2A), and the aqueous solution 16 is spread by a roller 18 of a screen printing machine (PS-540ARD, manufactured by Sakurai Dyeing Machine Co., Ltd.) (FIG. 2). (B)), and dried for 2 minutes in an atmosphere of 80 ° C. to obtain a laminated sheet 10 (FIG. 2C). The saponification degree of the aqueous solution 16 was 97.5 to 99 mol%, and the polyvinyl alcohol was 5% vol.
水溶液１６の滴下量と、滴下から乾燥させるまでの回数を異ならせることで、透湿吸水層１４の厚みが異なる積層シート１０を得た。透湿吸水層１４の厚みは、０．３μｍ、１．３μｍ、２．５μｍ、３．５μｍ、５．６μｍ、１０．４μｍ、１８μｍ、２０μｍであった。透湿吸水層１４の厚みが１８μｍであった時の電子顕微鏡写真を図３に示す。水溶液１６を複数回塗布して乾燥させているが、透湿吸水層１４が層分離することなく、一体に形成されているのがわかる。透湿吸水層１４の層厚を所望の厚みにするために複数回層形成しても良いことがわかる。 The laminated sheet 10 in which the thickness of the moisture-permeable water-absorbing layer 14 is different was obtained by making the amount of the aqueous solution 16 dropped and the number of times from dropping to drying. The thickness of the moisture permeable and water absorbing layer 14 was 0.3 μm, 1.3 μm, 2.5 μm, 3.5 μm, 5.6 μm, 10.4 μm, 18 μm, and 20 μm. An electron micrograph when the thickness of the moisture permeable and water absorbing layer 14 is 18 μm is shown in FIG. 3. Although the aqueous solution 16 is applied and dried a plurality of times, it can be seen that the moisture-permeable water-absorbing layer 14 is integrally formed without being separated. It can be seen that the moisture permeable and water absorbing layer 14 may be formed a plurality of times in order to obtain a desired thickness.
積層シートＡ〜Ｈのそれぞれの透湿吸水層１４の層厚、透気度、透湿抵抗を表１に示す。透湿抵抗の測定はＪＩＳ Ａ１３２４に基づいて行っている。透気度はＪＩＳ Ｐ８１１７に基づいた王研式透気度である。透湿吸水層１４の層厚は複数点測定し、その平均である。 Table 1 shows the layer thickness, air permeability, and moisture permeability resistance of each of the moisture permeable and water absorbing layers 14 of the laminated sheets A to H. The measurement of moisture permeability resistance is performed based on JIS A1324. The air permeability is the Oken type air permeability based on JIS P8117. The layer thickness of the moisture-permeable water-absorbing layer 14 is measured at a plurality of points and is the average.
表１から、透湿吸水層１４の厚みが３．５μｍ以上になれば、気温２５℃、湿度５０％の環境において、ＪＩＳ Ａ６９３０で規定された規定された３００ｍ２・ｈ・ｍｍＨｇ／ｇ以上の透湿抵抗を示した。乾燥した環境下では湿気を通さないことがわかる。 From Table 1, if the thickness of the moisture-permeable water-absorbing layer 14 is 3.5 μm or more, in an environment where the temperature is 25 ° C. and the humidity is 50%, the specified 300 m 2 · h · mmHg / g or more specified in JIS A6930 The moisture permeability resistance was shown. It can be seen that moisture cannot pass through in a dry environment.
また、気温４０℃、湿度９０％の環境において、いずれも３ｍ２・ｈ・ｍｍＨｇ／ｇ以下の透湿抵抗を示した。空気中に含まれる湿度の高い環境下では湿気を通すことがわかる。なお、表１のＣ〜Ｆにおける気温４０℃、湿度９０％の透湿抵抗を示していないが、透湿吸水層１４の層厚の厚い場合と薄い場合の両方が３ｍ２・ｈ・ｍｍＨｇ／ｇ以下になっており、その間も３ｍ２・ｈ・ｍｍＨｇ／ｇ以下であると考えられる。 In addition, in an environment where the temperature was 40 ° C. and the humidity was 90%, all exhibited moisture permeability resistance of 3 m 2 · h · mmHg / g or less. It can be seen that moisture passes in a high humidity environment contained in the air. In addition, although the moisture permeability resistance of the air temperature 40 degreeC and the humidity 90% in Table 1 CF is not shown, both the case where the layer thickness of the moisture-permeable water absorption layer 14 is thick is 3 m 2 · h · mmHg / It is considered that it is 3 m 2 · h · mmHg / g or less.
また、透湿吸水層１４の厚みが１．３μｍ以上ある積層シートＢ〜Ｈは透気度が９９９９９秒／１００ｍｌ以上になっている。積層シートＢ〜Ｈは空気を通さないことがわかる。 The laminated sheets B to H having the moisture permeable and water absorbing layer 14 having a thickness of 1.3 μm or more have an air permeability of 99999 seconds / 100 ml or more. It can be seen that the laminated sheets B to H are impermeable to air.
[比較例]
なお上記実験以外に、不織布（デュポン社製、タイベック１０６９Ｂ）にクラレ社製のＲＳ−２１１７の水溶液を滴下し、透湿吸水層を形成した。その層厚は凹凸によって計測できず、透気度は４１６０秒／１００ｍｌ、気温２５℃、湿度５０％の環境における透湿抵抗は７４ｍ２・ｈ・ｍｍＨｇ／ｇであった。不織布は表面粗さＲｚが２６．８μｍであり、表面の凹凸が大きく、透湿吸水層を形成することが難しいことが分かった。測定された透気度と透湿抵抗は低く、気密性と防湿性を保てないことが分かった。
[Comparative example]
In addition to the above experiment, an aqueous solution of RS-2117 manufactured by Kuraray Co., Ltd. was dropped on a non-woven fabric (manufactured by DuPont, Tyvek 1069B) to form a moisture permeable water absorbing layer. The layer thickness could not be measured due to the unevenness, and the air permeability was 4160 sec / 100 ml, the air temperature was 25 ° C., and the humidity resistance in an environment of 50% humidity was 74 m 2 · h · mmHg / g. It was found that the nonwoven fabric had a surface roughness Rz of 26.8 μm, large irregularities on the surface, and it was difficult to form a moisture-permeable water-absorbing layer. The measured air permeability and moisture resistance were low, and it was found that the airtightness and moisture resistance could not be maintained.
その他、本発明は、その主旨を逸脱しない範囲で当業者の知識に基づき種々の改良、修正、変更を加えた態様で実施できるものである。 In addition, the present invention can be carried out in a mode in which various improvements, modifications, and changes are added based on the knowledge of those skilled in the art without departing from the spirit of the present invention.
本発明の積層シートは住宅用建材、特に壁体内結露防止シートに利用することができる。また、調湿壁材、電子・精密機器用の容器、楽器・美術品用の容器、タンス、自動車内装材、冷凍庫、温熱具、乾燥剤、除湿剤、保冷剤、感染防止用のシーツ、医療用のガウンなどに使用することもできる。 The laminated sheet of the present invention can be used as a building material for housing, particularly a wall condensation prevention sheet. In addition, humidity control wall materials, containers for electronic and precision equipment, containers for musical instruments and artworks, chests, automotive interior materials, freezers, heating equipment, desiccants, dehumidifiers, cold insulation, infection prevention sheets, medical care It can also be used for gowns.
１０：積層フィルム
１２：基材フィルム
１４：透湿吸水層
１６：溶液
１８：ローラー
10: Laminated film 12: Base film 14: Moisture permeable water absorption layer 16: Solution 18: Roller
Claims (8)
前記基材シートに積層され、ポリビニルアルコールからなる透湿吸水層と、
を備え、
前記透湿吸水層は、
層厚が３．５μｍ以上、
ＪＩＳ Ｐ８１１７に基づく王研式透気度が９９９９９秒／１００ｍｌ以上、
気温２５℃、湿度５０％におけるＪＩＳ Ａ１３２４に基づく透湿抵抗が３００ｍ２・ｈ・ｍｍＨｇ／ｇ以上である
積層シート。 A moisture permeable substrate sheet;
Laminated to the base sheet, moisture permeable water absorbing layer made of polyvinyl alcohol, and
With
The moisture-permeable water-absorbing layer is
The layer thickness is 3.5 μm or more,
Oken air permeability based on JIS P8117 is 99999 seconds / 100ml or more,
A laminated sheet having a moisture permeability resistance of 300 m 2 · h · mmHg / g or more based on JIS A1324 at a temperature of 25 ° C. and a humidity of 50%.
ポリビニルアルコールを含む溶液で前記基材シートの表面を覆う工程と、
前記溶液を乾燥させ、層厚が３．５μｍ以上、ＪＩＳ Ｐ８１１７に基づく王研式透気度が９９９９９秒／１００ｍｌ以上、気温２５℃、湿度５０％におけるＪＩＳ Ａ１３２４に基づく透湿抵抗が３００ｍ２・ｈ・ｍｍＨｇ／ｇ以上であるポリビニルアルコールからなる透湿吸水層を形成する工程と、
を備えた積層シートの製造方法。 A step of preparing a moisture-permeable base sheet;
Covering the surface of the substrate sheet with a solution containing polyvinyl alcohol;
The solution was dried, the layer thickness was 3.5 μm or more, the Oken air permeability based on JIS P8117 was 99999 seconds / 100 ml or more, the moisture permeability resistance based on JIS A1324 at a temperature of 25 ° C. and a humidity of 50% was 300 m 2. forming a moisture-permeable water-absorbing layer made of polyvinyl alcohol having h · mmHg / g or more;
A method for producing a laminated sheet comprising:
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49143468U (en) * | 1973-04-11 | 1974-12-11 | ||
| JP2002172739A (en) * | 2000-12-05 | 2002-06-18 | Du Pont Kk | Moisture permeable waterproof sheet and wall structure |
| US20050250401A1 (en) * | 2004-05-07 | 2005-11-10 | Shigeru Baba | Compost coating material |
| JP2012206062A (en) * | 2011-03-30 | 2012-10-25 | Nihon Gore Kk | Composite membrane |
| JP2014061458A (en) * | 2012-09-20 | 2014-04-10 | Japan Vilene Co Ltd | Method of producing porous sheet imparted with polyvinyl alcohol resin |
| JP2016040354A (en) * | 2014-08-12 | 2016-03-24 | 三菱樹脂株式会社 | Method for producing laminated porous film |
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2016
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49143468U (en) * | 1973-04-11 | 1974-12-11 | ||
| JP2002172739A (en) * | 2000-12-05 | 2002-06-18 | Du Pont Kk | Moisture permeable waterproof sheet and wall structure |
| US20050250401A1 (en) * | 2004-05-07 | 2005-11-10 | Shigeru Baba | Compost coating material |
| JP2012206062A (en) * | 2011-03-30 | 2012-10-25 | Nihon Gore Kk | Composite membrane |
| JP2014061458A (en) * | 2012-09-20 | 2014-04-10 | Japan Vilene Co Ltd | Method of producing porous sheet imparted with polyvinyl alcohol resin |
| JP2016040354A (en) * | 2014-08-12 | 2016-03-24 | 三菱樹脂株式会社 | Method for producing laminated porous film |
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