JP4823879B2 - Water retention sheet - Google Patents
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- JP4823879B2 JP4823879B2 JP2006327970A JP2006327970A JP4823879B2 JP 4823879 B2 JP4823879 B2 JP 4823879B2 JP 2006327970 A JP2006327970 A JP 2006327970A JP 2006327970 A JP2006327970 A JP 2006327970A JP 4823879 B2 JP4823879 B2 JP 4823879B2
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Description
ヒートアイランド現象を緩和させることができる、保水性、耐火性、耐候性に優れた保水性シートに関する。 The present invention relates to a water retention sheet that can alleviate the heat island phenomenon and is excellent in water retention, fire resistance, and weather resistance.
近年、ヒートアイランド現象緩和のため、輻射熱の軽減効果を利用した屋上緑化、壁面緑化や、水の気化熱による冷却効果を利用した屋根材、道路基材が注目されている。 In recent years, in order to alleviate the heat island phenomenon, roof greening and wall greening using the effect of reducing radiant heat, and roofing materials and road base materials using the cooling effect due to the heat of vaporization of water have attracted attention.
特に緑化技術としては、特に家屋や建造物（ビル）の屋上、壁面、ベランダ、テラスなどに芝生等の植物を敷設する試みが盛んに行われているが、しかし、このような家庭の庭やベランダ、建造物の屋上、壁面に芝生等の植物を敷設する場合、運搬作業の煩雑さや周囲環境への土の飛散等が懸念されることから、植栽用土壌の代替として、合成樹脂発泡体や不織布等を主体に構成された植栽用基材が提案されている。 In particular, as greening technology, there are many attempts to lay plants such as lawns on the rooftops, walls, verandas, and terraces of houses and buildings (buildings). When laying plants such as lawns on the veranda, building roofs, and walls, there are concerns about the complexity of transportation work and the scattering of soil to the surrounding environment. A planting base material mainly composed of woven fabric and nonwoven fabric has been proposed.
また打ち水の原理を利用し、屋根や道路などに散水することも試みられているが、屋根材や舗装材はそもそも水を一定に保持しない構造となっているため、長時間の効果は少ない。 In addition, attempts have been made to spray water on roofs and roads using the principle of watering, but roofing and paving materials have a structure that does not hold water in the first place, so that they do not have long-term effects.
基材への散水を頻繁に行うことがなく、植物の安定な育成を促すためには、優れた保水性を有する基材が必要であり、特許文献１では親水性ポリエステル繊維を用いた保水性に優れた不織布が提案されている。 In order to promote stable plant growth without frequently spraying the base material, a base material having excellent water retention is required. In Patent Document 1, water retention using a hydrophilic polyester fiber is required. A non-woven fabric excellent in the above has been proposed.
しかしながら親水性ポリエステル繊維からなる不織布は耐火性能がなく、耐候性にも乏しいため、建物の屋根材などでは長期使用することはできない。
本発明は上記背景技術に鑑みなされたもので、十分な保水性を有し、かつ耐火性、耐候性に優れた保水性シートを提供することを目的とする。 This invention is made | formed in view of the said background art, and it aims at providing the water retention sheet | seat which has sufficient water retention property and was excellent in fire resistance and a weather resistance.
本発明者は、鋭意研究した結果、上層と下層の２層からなる保水性シートにおいて、該上層が、顔料を０．０１〜２重量％含有する合成繊維からなる、目付が５０〜１０００ｇ／ｍ2の繊維構造体であり、該下層が、不燃性繊維からなるカバーファクターが０．３０〜０．８０の織物であることを特徴とする保水性シートにより上記目的を達成できることを見出した。 As a result of diligent research, the inventor of the present invention has a water retention sheet composed of two layers, an upper layer and a lower layer. a second fiber structure, said lower layer is found that the object can be achieved by water retention sheet cover factor consisting of nonflammable fibers are characterized by a fabric 0.30.
本発明によれば、十分な保水性を有し、かつ耐火性、耐候性に優れた保水性シートを提供することができる。また、本発明の保水性シートでは、上記特性に加え、抱えきれなくなった余剰水が適度に冷却対象物に浸透する効果により、ヒートアイランド現象を緩和させることができる。 ADVANTAGE OF THE INVENTION According to this invention, it can provide the water retention sheet | seat which has sufficient water retention property and was excellent in fire resistance and a weather resistance. Moreover, in the water retention sheet | seat of this invention, in addition to the said characteristic, the heat island phenomenon can be relieve | moderated by the effect that the excess water which cannot be held has penetrate | infiltrated a cooling target object moderately.
本発明の保水性シートは、前述したように建物の屋根、壁面、ベランダ、テラス、道路などで長期使用に適した保水性シートである。また、上記保水性シートは、時々散水を行うことによりこの水を保持し、また、雨水を保持して、ヒートアイランド現象を緩和させることができるものである。 As described above, the water retention sheet of the present invention is a water retention sheet suitable for long-term use on the roof, wall surface, veranda, terrace, road, and the like of a building. In addition, the water-retaining sheet can retain this water by occasionally spraying water, and can also retain rainwater to alleviate the heat island phenomenon.
本発明の保水性シートは、上層と下層の２層からなる保水性シートである。本発明においては、該上層と該下層がそれぞれ以下の構成を有していることが肝要であり、かかる層の組み合わせとしたとき、本発明の目的とする、優れた保水性、耐火性、耐候性を同時に達成することができる。 The water retention sheet of the present invention is a water retention sheet comprising two layers, an upper layer and a lower layer. In the present invention, it is important that the upper layer and the lower layer have the following configurations, respectively, and when this layer is combined, the object of the present invention is excellent water retention, fire resistance, and weather resistance. Sex can be achieved at the same time.
すなわち、本発明の保水性シートは、下層では水が抜け難く、上層では耐候性を維持しながら水を十分取り込んで優れた保水効果を発揮する構造となっている。 That is, the water-retaining sheet of the present invention has a structure in which water is difficult to escape in the lower layer, and the upper layer takes in water sufficiently while maintaining the weather resistance and exhibits an excellent water retaining effect.
したがって、上層は、顔料を０．０１〜２重量％含有する合成繊維からなる、目付が５０〜１０００ｇ／ｍ2の繊維構造体とする必要がある。 Therefore, the upper layer needs to be a fiber structure having a basis weight of 50 to 1000 g / m 2 made of a synthetic fiber containing 0.01 to 2% by weight of a pigment.
上層の繊維構造体の目付が５０ｇ／ｍ2未満の場合は十分な保水性や耐候性が得られない。一方、上記目付が１０００ｇ／ｍ2を超えると、保水量が多くなり過ぎシートが弛み易くなる。また、繊維構造体の目付を上記範囲とすることで、保水性シートの成形性や取扱性の点でも良好なものとなる。好ましい繊維構造体の目付は１００〜５００ｇ／ｍ2である。 When the basis weight of the upper fiber structure is less than 50 g / m 2, sufficient water retention and weather resistance cannot be obtained. On the other hand, if the weight per unit area exceeds 1000 g / m 2 , the water retention amount increases so that the sheet is easily loosened. Moreover, it becomes favorable also in the point of the moldability and handleability of a water retention sheet | seat by making the fabric weight of a fiber structure into the said range. A preferred basis weight of the fiber structure is 100 to 500 g / m 2 .
また、上記繊維構造体に用いる合成繊維において顔料の含有量が０．０１未満の場合は十分な耐候性が得られず、一方、含有量が２重量％を超えても合成繊維の強度が低下するだけで耐候性の効果はそれほど高くならない。好ましい顔料の含有量は０．０５〜０．８重量％である。 In addition, when the content of the pigment in the synthetic fiber used in the fiber structure is less than 0.01, sufficient weather resistance cannot be obtained. On the other hand, even if the content exceeds 2% by weight, the strength of the synthetic fiber decreases. The effect of weather resistance is not so high just by doing. A preferable pigment content is 0.05 to 0.8% by weight.
上記顔料としては無機顔料、有機顔料のいずれも用いることができ、具体的には酸化チタン、カーボンブラックなどを好ましく採用することができる。なお顔料は２種類以上を組合わせてもよい。 As the pigment, either an inorganic pigment or an organic pigment can be used, and specifically, titanium oxide, carbon black, and the like can be preferably used. Two or more types of pigments may be combined.
上記繊維構造体としては、織物、編物、不織布などを挙げることができるが、特に不織布が嵩高な構造とし保水効率を高くすることができる点で好ましい。 Examples of the fiber structure include woven fabrics, knitted fabrics, and non-woven fabrics, but the non-woven fabrics are particularly preferable in that they have a bulky structure and can improve water retention efficiency.
また、上記繊維構造体を構成する合成繊維としては、ポリエステル繊維、ポリアミド繊維、ポリオレフィン繊維、芳香族ポリアミド繊維があげられるが、加工性、力学特性、耐候性などから特にポリエステル繊維が好ましい。 The synthetic fibers constituting the fiber structure include polyester fibers, polyamide fibers, polyolefin fibers, and aromatic polyamide fibers. Polyester fibers are particularly preferable from the viewpoint of processability, mechanical properties, weather resistance, and the like.
なお、上記の合成繊維は単繊維の繊度は、１〜２００ｄｔｅｘであることが保水性および加工性の点から好ましい。 In addition, as for the said synthetic fiber, it is preferable from the point of water retention and workability that the fineness of a single fiber is 1-200 dtex.
一方、本発明においては、下層として、不燃性繊維からなるカバーファクターが０．３０〜０．８０の高密度の織物を用いる必要があり、これにより高い耐火性と保水性を同時に達成することができる。 On the other hand, in the present invention, it is necessary to use a high-density fabric having a cover factor of 0.30 to 0.80 made of non-combustible fibers as the lower layer, thereby achieving high fire resistance and water retention simultaneously. it can.
ここで不燃性繊維としては、ガラス繊維、ロックウール、炭素繊維などが好ましく挙げられるが、加工性や汎用性に優れたガラス繊維が特に好ましい。 Here, preferred examples of the non-combustible fiber include glass fiber, rock wool, and carbon fiber, and glass fiber excellent in workability and versatility is particularly preferable.
上記織物のカバーファクターが０．３０未満の場合は、散水した水などが抜け易くなり保水性シートに十分な保水性を付与することができない。また、本発明の目的とする高い耐火性が得られない傾向にある。一方で、保水性シートで抱えきれなくなった余剰水はそのまま保水性シートを伝わって外部に流出させるよりも、保水性シートから適度にしみ出させ屋根などの冷却対象物まで浸透させた方が、ヒートアイランド現象を緩和させる上で望ましい。したがって、織物のカバーファクターを高くし過ぎると、かかる効果が得られないため、カバーファクターは０．８０以下とする必要がある。また、本発明においては、織物のカバーファクターが大きくなりすぎると、透水性が著しく低下して上層と下層の間に水が溜まり上層が浮いた状態になって美観を損ね易くなる。さらに、保水性シート自体が硬くなり屋根など敷き詰めて用いる際、凹凸にフィットし難くなり、取扱性も悪くなる傾向にある。なお、好ましい織物のカバーファクターは０．４０〜０．７０である。 When the cover factor of the woven fabric is less than 0.30, water that has been sprinkled can easily escape, and sufficient water retention cannot be imparted to the water retention sheet. Moreover, it exists in the tendency for the high fire resistance made into the objective of this invention not to be acquired. On the other hand, the excess water that can no longer be held by the water retention sheet is more appropriately oozed from the water retention sheet to permeate the cooling object such as the roof, rather than being transferred to the outside through the water retention sheet, It is desirable to alleviate the heat island phenomenon. Accordingly, if the cover factor of the fabric is too high, such an effect cannot be obtained, so the cover factor needs to be 0.80 or less. In the present invention, if the cover factor of the fabric is too large, the water permeability is remarkably lowered and water is accumulated between the upper layer and the lower layer, so that the upper layer is floated and the aesthetic appearance is easily lost. Furthermore, when the water-retaining sheet itself is hardened and used on a roof or the like, it tends to be difficult to fit the unevenness and the handling property tends to be poor. A preferable cover factor of the fabric is 0.40 to 0.70.
本発明の保水性シートの保水量は５００ｇ／ｍ2以上であることが好ましい。ヒートアイランド対策の屋根材では、水の気化熱による冷却効果を利用するが、保水量が５００ｇ／ｍ2未満であると十分な冷却効果が得られない。上記保水量は好ましくは８００ｇ／ｍ2以上である。一方、保水量が多くなり過ぎると、吸水して保水性シートが弛み易くなるため、保水量は５０００ｇ／ｍ2以下が好ましく、２０００ｇ／ｍ2以下がより好ましい。 The water retention amount of the water retention sheet of the present invention is preferably 500 g / m 2 or more. The roofing material for heat island countermeasures uses the cooling effect due to the heat of vaporization of water, but if the water retention amount is less than 500 g / m 2 , a sufficient cooling effect cannot be obtained. The water retention amount is preferably 800 g / m 2 or more. On the other hand, when the water retention capacity is too high, since the water retention sheet is liable loosened by water absorption, water retention capacity is preferably 5000 g / m 2 or less, 2000 g / m 2 or less is more preferable.
また、本発明の保水性シートの透水係数は１×１０-5〜１×１０-1ｃｍ／ｓであることが好ましい。透水係数が１×１０-5ｃｍ／ｓ未満であると、水を透過させることは困難であり、保水しきれない余剰水を外部に流出してしまうが、透水係数を１×１０-5ｃｍ／ｓ以上にすることにより、余剰水を冷却対象物まで浸透させることができる。また透水係数が１×１０-1ｃｍ／ｓを超えると、５００ｇ／ｍ2以上の保水量を確保するのが困難になる。上記透水係数は好ましくは１×１０-4〜１×１０-2ｃｍ／ｓである。 Moreover, it is preferable that the water permeability of the water-retaining sheet of the present invention is 1 × 10 −5 to 1 × 10 −1 cm / s. If the water permeability is less than 1 × 10 −5 cm / s, it is difficult to permeate water, and excess water that cannot be retained will flow out to the outside, but the water permeability is 1 × 10 −5 cm. By setting it to / s or more, surplus water can be permeated to the cooling object. On the other hand, when the water permeability coefficient exceeds 1 × 10 −1 cm / s, it becomes difficult to secure a water retention amount of 500 g / m 2 or more. The water permeability is preferably 1 × 10 −4 to 1 × 10 −2 cm / s.
本発明においては、上層および下層の透水係数が下記関係を満足していることが好ましい。これにより、高い保水性を維持すると共に、保水性シートとして上記透水係数を達成し易くなる。 In the present invention, the water permeability coefficients of the upper layer and the lower layer preferably satisfy the following relationship. Thereby, while maintaining high water retention, it becomes easy to achieve the said water permeability as a water retention sheet.
１×１０-4ｃｍ／ｓ＜下層の透水係数＜上層の透水係数＜５×１０-1ｃｍ／ｓ 1 × 10 −4 cm / s <water permeability coefficient of lower layer <water permeability coefficient of upper layer <5 × 10 −1 cm / s
本発明の保水性シートは、サンシャイン耐候試験における５００時間暴露した後の強度保持率が５０％以上であり、耐候劣化が少ないことが好ましい。 The water retention sheet of the present invention preferably has a strength retention of 50% or more after being exposed for 500 hours in a sunshine weather resistance test and has little weather resistance deterioration.
上層の遮光率が８０％以上であることが好ましい。遮光率が８０％未満であると、紫外線の透過により有機物の劣化が促進されやすく、サンシャイン耐候試験における５００時間暴露した後の強度保持率を５０％以上にすることは難しくなる傾向にある。 It is preferable that the light shielding rate of the upper layer is 80% or more. When the light-shielding rate is less than 80%, the deterioration of organic substances is easily promoted by the transmission of ultraviolet rays, and it tends to be difficult to increase the strength retention after exposure for 500 hours in the sunshine weathering test to 50% or more.
以上に説明した保水性シートは次の方法により製造することができる。すなわち、保水性シートを製造する方法としては、上層の繊維構造体は、公知の方法により、織物、編物、不織布として成形することができる。不織布の成形においては、単繊維をカード機に通してウェブとしこれにニードルパンチやウォータージェットを施して短繊維を交絡させて不織布とする方法や、スパンボンド、メルトブローなどの方法を採用することができる。特に、本発明においては、上記のニードルパンチにより得られる不織布が嵩高性に優れ、高い保水性が得られる点で好ましい。また、下層の織物も公知の方法により成形することができる。こうして得られた上層の繊維構造体と下層の織物を積層し、縫製、接着剤による接着、熱接着などの方法を用いて両方の層をずれないよう互いに固定して保水性シートとすることができる。 The water retention sheet described above can be produced by the following method. That is, as a method for producing a water-retaining sheet, the upper-layer fiber structure can be formed as a woven fabric, a knitted fabric, or a non-woven fabric by a known method. In forming the nonwoven fabric, it is possible to adopt a method such as spunbond or melt blown, a method in which a single fiber is passed through a card machine to form a web, and this is subjected to needle punching or water jet to entangle the short fibers into a nonwoven fabric. it can. In particular, in the present invention, the nonwoven fabric obtained by the above needle punch is preferable in that it has excellent bulkiness and high water retention. Also, the lower layer fabric can be formed by a known method. The upper layer fiber structure and the lower layer fabric thus obtained may be laminated and fixed to each other using a method such as sewing, bonding with an adhesive, thermal bonding, etc. so as not to deviate from each other to form a water retaining sheet. it can.
以下、実施例により本発明を具体的に説明する。なお、実施例中の各特性は下記の測定方法により評価した。
（１）単位面積質量（目付）
ＪＩＳ Ｌ−１９０８に規定される方法に準じて測定した。
（２）カバーファクター
カバーファクター（ＣＦ）は下記式により求めた。
ＣＦ＝（ｄ1×ｎ1）／Ｓ＋（ｄ2×ｎ2）／Ｓ−（ｄ1×ｄ2）×（ｎ1×ｎ2）／Ｓ
ここで、Ｓは織物の単位面積、ｄ1はタテ糸の直径、ｄ2はヨコ糸の直径、ｎ1は単位面積Ｓ中に存在するタテ糸の本数、ｎ2は単位面積Ｓ中に存在するヨコ糸の本数を示す。
（３）透水係数
ＪＩＳ Ｌ−３２０４に規定される方法に準じて測定した。
（４）遮光率
ＪＩＳ Ｌ−１０９６のＡ法によって規定される方法に準じて測定した。
（５）サンシャイン耐候試験
ＪＩＳ Ｂ ７７５１法に規定される方法に準じて測定した。
（６）保水率
シートを１０ｃｍ×１０ｃｍにカットしたサンプルを、８０℃で１２０分乾燥後、２０℃、６５％ＲＨの部屋で２４時間調湿し、この調湿後のシートの重量（Ｗ１）を測定する。次いで、該シートを２０℃の純水に浸漬し、手で十分に脱泡後、３０分間放置してから引き上げ、水滴が止まるまで放置（約２０分間）し、その重量（Ｗ２）を測定し、下記の計算式により保水率を算出した。
保水率＝（Ｗ２−Ｗ１）／Ｗ１×１００％
（７）耐火性
シートを１０ｃｍ×１０ｃｍにカットしたサンプルを、８０℃で１２０分乾燥後、２０℃、６５％ＲＨの部屋で２４時間調湿し、該シートを７６０℃に２０分放置し、冷却した。得られたシートの表面を観察し、上記処理で発生した直径０．５ｍｍ以上のピンホールが、６ヶ未満のものを良好、６ヶ以上のものを不良と判定した。
Hereinafter, the present invention will be described specifically by way of examples. In addition, each characteristic in an Example was evaluated with the following measuring method.
(1) Unit area mass (weight)
It measured according to the method prescribed | regulated to JISL-1908.
(2) Cover factor The cover factor (CF) was determined by the following formula.
CF = (d 1 × n 1 ) / S + (d 2 × n 2) / S- (d 1 × d 2) × (n 1 × n 2) / S
Here, S is the unit area of the woven fabric, d 1 is the warp yarn diameter, d 2 is the weft yarn diameter, n 1 is the number of warp yarns present in the unit area S, and n 2 is present in the unit area S. Indicates the number of weft threads to be used.
(3) Permeability coefficient It measured according to the method prescribed | regulated to JISL-3204.
(4) Light shielding ratio It measured according to the method prescribed | regulated by A method of JIS L-1096.
(5) Sunshine weather resistance test It measured according to the method prescribed | regulated to JISB7751 method.
(6) Water retention rate A sample obtained by cutting a sheet into 10 cm × 10 cm was dried at 80 ° C. for 120 minutes, and then humidity-controlled in a room at 20 ° C. and 65% RH for 24 hours, and the weight of the sheet after this humidity adjustment (W1) Measure. Next, the sheet is immersed in pure water at 20 ° C., sufficiently defoamed by hand, left for 30 minutes, then lifted, left until the water droplets stop (about 20 minutes), and its weight (W2) is measured. The water retention rate was calculated by the following formula.
Water retention rate = (W2-W1) / W1 × 100%
(7) Fire resistance A sample obtained by cutting the sheet into 10 cm × 10 cm was dried at 80 ° C. for 120 minutes, then conditioned for 24 hours in a room at 20 ° C. and 65% RH, and the sheet was left at 760 ° C. for 20 minutes. Cooled down. The surface of the obtained sheet was observed, and it was determined that the number of pinholes having a diameter of 0.5 mm or more generated by the above treatment was good when the number was less than 6 and that the number of pins having 6 or more was bad.
［実施例１］
短繊維の繊度が２２ｄｔｅｘ、繊維長が５１ｍｍであり、顔料としてカーボンブラックを０．５重量％含有するポリエチレンテレフタレート短繊維（帝人ファイバー株式会社製）をカーディング工程にて開繊して得たウェブに、ニードルパンチ処理を２００ポイント／ｃｍ2の条件により強制交絡処理を施し、目付が３５０ｇ／ｍ2の上層に用いる不織布を作成した。この上層に用いる不織布の遮光率は９５％、透水係数は５×１０-1ｃｍ／ｓであった。
[Example 1]
A web obtained by opening a polyethylene terephthalate short fiber (manufactured by Teijin Fibers Ltd.) having a fineness of 22 dtex and a fiber length of 51 mm and containing 0.5% by weight of carbon black as a pigment in the carding process. Then, the needle punching process was forcibly entangled under the condition of 200 points / cm 2 , and a nonwoven fabric having a basis weight of 350 g / m 2 as an upper layer was prepared. The nonwoven fabric used for this upper layer had a light shielding rate of 95% and a water permeability of 5 × 10 −1 cm / s.
さらに、６７５ｄｔｅｘのガラスヤーン（ユニチカグラスファイバー株式会社製）を用いて、タテ糸密度が４２本／ｉｎｃｈ、ヨコ糸密度が３２本／ｉｎｃｈ、カバーファクター（ＣＦ）が０．４６、目付が２１０ｇ／ｍ2の下層に用いる平織物を製織し作成した。 Furthermore, using a 675 dtex glass yarn (manufactured by Unitika Glass Fiber Co., Ltd.), the warp yarn density is 42 yarns / inch, the weft yarn density is 32 yarns / inch, the cover factor (CF) is 0.46, and the basis weight is 210 g / A plain woven fabric used for the lower layer of m 2 was woven and prepared.
上記の下層に用いる平織物の上に、上層に用いる不織布を積層し、両端部を縫製して保水性シートを得た。得られた保水性シートの物性を表１に示す。 The nonwoven fabric used for the upper layer was laminated on the plain fabric used for the lower layer, and both ends were sewn to obtain a water retention sheet. Table 1 shows the physical properties of the water-retaining sheet obtained.
［実施例２，３、比較例１］
ポリエチレンテレフタレート短繊維のカーボンブラックの含有量を表１のように変更した以外は実施例１と同様にして保水性シートを得た。結果を表１に示す。
[Examples 2 and 3, Comparative Example 1]
A water retention sheet was obtained in the same manner as in Example 1 except that the carbon black content of the polyethylene terephthalate short fibers was changed as shown in Table 1. The results are shown in Table 1.
［実施例４，５，６、比較例２］
ポリエチレンテレフタレート短繊維の量を変更し、上層に用いる不織布の目付を表１のように変更した以外は実施例１と同様にして保水性シートを得た。結果を表１に示す。
[Examples 4, 5, and 6, Comparative Example 2]
A water retention sheet was obtained in the same manner as in Example 1 except that the amount of short polyethylene terephthalate fiber was changed and the basis weight of the nonwoven fabric used for the upper layer was changed as shown in Table 1. The results are shown in Table 1.
［実施例７，８、比較例３］
ガラスヤーンの製織条件を変更し、下層に用いる平織物のタテ糸密度、ヨコ糸密度、カバーファクターを表１のように変更した以外は実施例１と同様にして保水性シートを得た。結果を表１に示す。
[Examples 7 and 8, Comparative Example 3]
A water retention sheet was obtained in the same manner as in Example 1 except that the weaving conditions of the glass yarn were changed and the warp yarn density, weft yarn density, and cover factor of the plain woven fabric used for the lower layer were changed as shown in Table 1. The results are shown in Table 1.
［比較例４］
上層に用いる不織布の目付および下層に用いる平織物のタテ糸密度、ヨコ糸密度、カバーファクターを表１のように変更した以外は実施例１と同様にして保水性シートを得た。結果を表１に示す。
[Comparative Example 4]
A water retention sheet was obtained in the same manner as in Example 1 except that the basis weight of the nonwoven fabric used for the upper layer and the warp yarn density, weft yarn density, and cover factor of the plain fabric used for the lower layer were changed as shown in Table 1. The results are shown in Table 1.
本発明の保水性シートは、十分な保水性を有し、かつ耐火性、耐候性に優れている。また、上記保水性シートは、時々散水を行うことによりこの水を保持し、また、雨水を保持し、ヒートアイランド現象を緩和させることができる。このため、建物の屋根、壁面、ベランダ、テラス、道路などにおいて長期安定して使用することができる。 The water retention sheet of the present invention has sufficient water retention and is excellent in fire resistance and weather resistance. Moreover, the water-retaining sheet can retain this water by occasionally spraying water, can also retain rainwater, and can alleviate the heat island phenomenon. For this reason, it can be used stably for a long time on the roof, wall surface, veranda, terrace, road, etc. of a building.
Claims (7)
１×１０-4ｃｍ／ｓ＜下層の透水係数＜上層の透水係数＜５×１０-1ｃｍ／ｓ The water retention sheet according to claim 1, wherein the water permeability coefficient of the upper layer and the lower layer satisfies the following relationship.
1 × 10 −4 cm / s <water permeability coefficient of lower layer <water permeability coefficient of upper layer <5 × 10 −1 cm / s
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