JP2022178562A - Thermal insulation sheet - Google Patents

Thermal insulation sheet Download PDF

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JP2022178562A
JP2022178562A JP2021085444A JP2021085444A JP2022178562A JP 2022178562 A JP2022178562 A JP 2022178562A JP 2021085444 A JP2021085444 A JP 2021085444A JP 2021085444 A JP2021085444 A JP 2021085444A JP 2022178562 A JP2022178562 A JP 2022178562A
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heat shield
weight
sheet
base resin
thermal insulation
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喜正 山本
Yoshimasa Yamamoto
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Sekisui Jushi Corp
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Sekisui Jushi Corp
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/25Greenhouse technology, e.g. cooling systems therefor

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Abstract

To provide a thermal insulation sheet material which allows a thermal insulation layer thereof to be easily detached due to gradual deterioration thereof caused by outdoor use.SOLUTION: In a thermal insulation sheet 10 where a thermal insulation layer 30 is formed on a surface of a sheet-shaped substrate 20 of polyolefin, with the visible light transmissivity of 27% or more, the thermal insulation layer 30 includes a base resin 31 and a thermal insulation material 32, the base resin includes natural rubber and polylactic acid, the thermal insulation material includes fine particles with the average particle size of 10 μm or less and coarse particles with the average particle size of higher than 10 μm. The fine particles are contained 10 to 20 pts.wt. with respect to the base resin of 100 pts.wt. and the coarse particles are contained 50 to 120 pts.wt. with respect to the base resin of 100 pts.wt., so that the thermal insulation layer 30 can gradually deteriorate and can be easily removed.SELECTED DRAWING: Figure 1

Description

本発明は、農園芸用のビニールハウスやトンネル栽培で用いる農業用シートにおいて、合成樹脂からなるシートの表面に、遮熱性を有する遮熱層が形成された遮熱シートに関する。 TECHNICAL FIELD The present invention relates to an agricultural sheet for agricultural and horticultural greenhouses and tunnel cultivation, and relates to a heat shielding sheet in which a heat shielding layer having heat shielding properties is formed on the surface of a synthetic resin sheet.

農園芸用のビニールハウスやトンネル栽培においては、夏期は内部の温度が上昇するので、適切な温度を保持するために、空調設備を導入したり、ビニールハウスやトンネル栽培で表面を覆う被覆材の一部を開閉可能として通気を可能にしたり、被覆材として遮熱シートを用いたりすることがある。 In greenhouses and tunnel cultivation for agricultural and horticultural use, the internal temperature rises in the summer, so in order to maintain an appropriate temperature, it is necessary to introduce air conditioning equipment and cover the surface of plastic greenhouses and tunnel cultivation. In some cases, a part can be opened and closed to allow ventilation, or a heat shield sheet is used as a covering material.

被覆材として遮熱シートを用いる場合は、シート材の表面に遮熱性塗料を塗装して遮熱層を設ける場合や、基材と遮熱材料が添加された遮熱層を有する複数層かなるシート材を成形する場合などがある。 When a heat shield sheet is used as a coating material, a heat shield layer is provided by painting a heat shield paint on the surface of the sheet material, or a base material and a heat shield layer with a heat shield material added. There are cases where sheet material is molded.

例えば、特許文献1には、合成樹脂繊維からなる不織布の少なくとも片面に、屈折率の高い白色顔料を分散した合成樹脂バインダーをコーティング、乾燥して得られる遮光資材が提案されている。 For example, Patent Literature 1 proposes a light-shielding material obtained by coating at least one side of a nonwoven fabric made of synthetic resin fibers with a synthetic resin binder in which a white pigment having a high refractive index is dispersed, followed by drying.

特開平10-174530号公報JP-A-10-174530

ところで、特許文献1に記載の遮光資材は、適度な遮光性を有し、散乱光を被覆系内に透過させると共に、高い遮熱性を有することが期待される。しかしながら、被覆材として遮光性が必要となれるのは、通年ではなく、日差しが強い夏期である場合が多い。冬期においては、むしろ、日光を取り入れる必要があるので、コーティング層は除去又は脱離が可能な形態が要望されていた。 By the way, the light-shielding material described in Patent Document 1 is expected to have an appropriate light-shielding property, transmit scattered light into the coating system, and have a high heat-shielding property. However, it is often the summer season when the sunlight is strong that the covering material needs to have a light-shielding property, not all year round. In winter, it is rather necessary to take in sunlight, so there has been a demand for a form in which the coating layer can be removed or detached.

本発明は、前記の如き問題点を解消し、屋外での使用により遮熱層が徐々に劣化して、遮熱層の脱離が容易な遮熱性シート材を提供する。 The present invention solves the above problems and provides a heat shielding sheet material whose heat shielding layer gradually deteriorates due to outdoor use and whose heat shielding layer can be easily removed.

上記課題を解決するために、本発明者は鋭意研究した結果、ポリ乳酸と天然ゴムとからなるベース樹脂と遮熱材料とを含む組成物を用いて、ポリエチレン系のシート状の基材の表面に遮熱層を形成して、所定の遮熱性能を備えた遮熱シートを作成すれば、屋外において、所定の期間は遮熱性能を保持しつつ、遮熱層が劣化して、徐々に除去しやすくなることを知得し、本発明を完成するに至った。 In order to solve the above-mentioned problems, the present inventors conducted intensive research and found that the surface of a polyethylene-based sheet-like base material was coated with a composition containing a base resin made of polylactic acid and natural rubber and a heat-shielding material. If a heat shielding sheet with a predetermined heat shielding performance is created by forming a heat shielding layer on the outside, the heat shielding layer will gradually deteriorate while maintaining the heat shielding performance for a predetermined period outdoors. The inventors have learned that it is easier to remove, and have completed the present invention.

すなわち、本発明に係る遮熱シートは、ポリオレフィンのシート状の基材の表面に、遮熱層が形成された遮熱シートであって、可視光透過率が27%以上であり、前記遮熱層は、ベース樹脂と遮熱材とを含み、前記ベース樹脂は、天然ゴムとポリ乳酸とを含み、前記遮熱材は、平均粒径10μm以下の細粒子と、平均粒径10μmを超える粗粒子とを含み、前記細粒子は、ベース樹脂100重量部に対して10~20重量部含み、前記粗粒子は、ベース樹脂100重量部に対して50~120重量部含むことを特徴とするものである。 That is, the heat shield sheet according to the present invention is a heat shield sheet in which a heat shield layer is formed on the surface of a polyolefin sheet-like base material, the visible light transmittance is 27% or more, and the heat shield sheet The layer includes a base resin and a heat shielding material, the base resin includes natural rubber and polylactic acid, and the heat shielding material includes fine particles with an average particle size of 10 μm or less and coarse particles with an average particle size of more than 10 μm. wherein the fine particles are 10 to 20 parts by weight with respect to 100 parts by weight of the base resin, and the coarse particles are 50 to 120 parts by weight with respect to 100 parts by weight of the base resin. is.

本発明に係る遮熱シートにおいて、前記天然ゴムとポリ乳酸との配合比率(重量比率)は、天然ゴム:ポリ乳酸=5~55:95~45であり、サンシャインウェザオメーターによる促進耐候試験24時間後において、遮熱層が基材に密着していることが好ましい。 In the heat shield sheet according to the present invention, the compounding ratio (weight ratio) of the natural rubber and polylactic acid is natural rubber:polylactic acid=5 to 55:95 to 45, and accelerated weather resistance test 24 by sunshine weatherometer After a period of time, it is preferable that the heat shield layer is in close contact with the substrate.

本発明によれば、本発明に係る遮熱シートを、農業用ハウスや、いわゆる、ビニールハウスで用いられる農業用シートとして利用すると、遮熱性能が必要となる夏期に設置すれば、遮熱性能が不要となる冬期の前には遮熱層に含まれる天然ゴム成分が特に劣化しやすいので、一部は降雨により地面に落下し、基材に残存する遮熱層も経時的に密着性が低下することが期待されるので除去しやすくなる。 According to the present invention, when the heat shield sheet according to the present invention is used as an agricultural sheet for use in an agricultural house or a so-called vinyl house, it can be installed in summer when heat shielding performance is required. Since the natural rubber component contained in the heat shield layer is particularly prone to deterioration before winter, when the heat shield layer is no longer needed, part of it falls to the ground due to rainfall, and the heat shield layer that remains on the base material loses its adhesion over time. Since it is expected to decrease, it becomes easier to remove.

本発明において、天然ゴムとポリ乳酸との配合比率(重量比率)は、天然ゴム:ポリ乳酸=5~55:95~45であり、サンシャインウェザオメーターによる促進耐候試験24時間後において、遮熱層が基材に密着しているようにすれば、劣化しやすい天然ゴム成分が含まれていても、所定の期間は遮熱層が保持されることが期待される。 In the present invention, the blending ratio (weight ratio) of natural rubber and polylactic acid is natural rubber:polylactic acid=5-55:95-45. If the layer is in close contact with the base material, it is expected that the heat shield layer will be maintained for a predetermined period of time even if it contains a natural rubber component that easily degrades.

本発明に係る遮熱シートにおいて実施の一形態を示す概略図である。1 is a schematic diagram showing an embodiment of a heat shield sheet according to the present invention; FIG.

本発明の実施の形態にについて、図面に基づき以下に具体的に説明する。図1は本発明に係る遮熱シートの実施の一形態を示す断面図である。遮熱シート10は、ポリエチレン系のシート状の基材20の一方の面に遮熱層30を有するものである。基材の厚さは0.05~0.15μmが好適であり、乾燥塗膜重量1.0~2.0mg/mが好適である。 An embodiment of the present invention will be specifically described below based on the drawings. FIG. 1 is a cross-sectional view showing an embodiment of a heat shield sheet according to the present invention. The heat shield sheet 10 has a heat shield layer 30 on one surface of a polyethylene-based sheet-like base material 20 . The thickness of the substrate is preferably 0.05-0.15 μm, and the dry coating weight is preferably 1.0-2.0 mg/m 2 .

基材20は、農業用ハウスやビニールハウス用に用いられるポリオレフィン系シートのものであれば、特に限定されるものではない。ポリオレフィン系シートの材料の具体例としては、ポリエチレン、EVA(エチレン-酢酸ビニル共重合体)、EAA(エチレン-アクリル酸共重合体)などを挙げることができる。また、市販品としては、ダイヤスター(三菱ケミカルアグリドリーム社)、スーパーダイヤスター(三菱ケミカルアグリドリーム社)、農サクビ(昭和パックス社)などが挙げられる。 The base material 20 is not particularly limited as long as it is a polyolefin sheet used for agricultural greenhouses and vinyl greenhouses. Specific examples of the material of the polyolefin sheet include polyethylene, EVA (ethylene-vinyl acetate copolymer), EAA (ethylene-acrylic acid copolymer), and the like. Commercially available products include Diastar (Mitsubishi Chemical Agridream), Super Diastar (Mitsubishi Chemical Agridream), Agricultural Sakubi (Showa Pax), and the like.

遮熱層30は、ベース樹脂31と遮熱材32とを含むものである。ベース樹脂31は、天然ゴムと、ポリ乳酸とを有するものである。したがって、遮熱シート10を屋外で使用すると、経時的に劣化するとともに、降雨によって遮熱層30の一部が基材20から剥離して地面に流されることになる。天然ゴム及びポリ乳酸は、いずれも生分解性を有するので徐々に分解されるため、一般的な合成樹脂のように、劣化しても破片として残存し、いわゆる、マイクロプラスチックスが生じるおそれが少なく、環境への負荷を小さくすることができる。 The heat shield layer 30 includes a base resin 31 and a heat shield material 32 . The base resin 31 contains natural rubber and polylactic acid. Therefore, when the heat shield sheet 10 is used outdoors, it deteriorates over time, and part of the heat shield layer 30 is peeled off from the base material 20 and washed to the ground due to rainfall. Since both natural rubber and polylactic acid are biodegradable, they are gradually decomposed, so unlike general synthetic resins, they remain as fragments even if they deteriorate, and there is little risk of so-called microplastics. , the load on the environment can be reduced.

遮熱材32は、遮熱性能を付与できるものであれば、特に限定されるものではないが、無機物が好適に用いられる。無機物としては、平均粒子径が10μm以下のものを細粒子とし、平均粒径が10μmを超えるものを粗粒子とすれば、一般に、ベース樹脂31に対する配合割合が同量の場合、細粒子を用いた方が粗粒子を用いる場合よりも粒子の数が多くなり、よって、遮光層30の厚み方向に対して隙間なく配向されるため、細粒子を用いた方が光を反射しやすくなる。ここで、本発明に係る遮熱フィルムに求められる遮熱性は、主に近赤外線の反射性能であって、植物の光合成に必要な波長を含む可視光線は遮蔽しにくい方が好ましい。 The heat shielding material 32 is not particularly limited as long as it can impart heat shielding performance, but an inorganic material is preferably used. If the inorganic substance has an average particle size of 10 μm or less as fine particles, and an average particle size of more than 10 μm as coarse particles, then in general, fine particles are used when the blending ratio to the base resin 31 is the same. Using fine particles makes it easier to reflect light because the number of particles is larger than when coarse particles are used, and the particles are oriented with no gaps in the thickness direction of the light shielding layer 30 . Here, the heat shielding property required for the heat shielding film according to the present invention is mainly near-infrared reflective performance, and it is preferable that it is difficult to shield visible light including wavelengths necessary for photosynthesis of plants.

平均粒子径の測定は、粒度分布計(日機装社製 マイクロトラック粒度分布計 MT3300EX2)によって実施し、測定値においてD50の値を平均粒子径とした。 The average particle size was measured using a particle size distribution meter (Microtrac particle size distribution meter MT3300EX2 manufactured by Nikkiso Co., Ltd.), and the D50 value was taken as the average particle size.

すなわち、細粒子のもののみ添加した場合、近赤外線の反射性能を上げると、可視光線の遮蔽率も上がってしまう。加えて、近赤外線の反射性能は、可視光線の遮蔽率よりは上がり難い傾向を示したため、細粒子と粗粒子との双方を含むようにすることで、適切な遮熱性を容易に得られることを見いだした。 In other words, when only fine particles are added, if the near-infrared reflection performance is increased, the visible light shielding rate is also increased. In addition, near-infrared reflection performance tends to be more difficult to improve than visible light shielding, so by including both fine and coarse particles, it is possible to easily obtain appropriate heat shielding properties. I found

具体的には、ベース樹脂(固形分量)100重量部に対して、細粒子を10~20重量部含み、かつ、粗粒子を50~120重量部含むようにすると、遮熱シート10が優れた遮熱性を有するものとなる。 Specifically, when 10 to 20 parts by weight of fine particles and 50 to 120 parts by weight of coarse particles are contained with respect to 100 parts by weight of the base resin (solid content), the heat shield sheet 10 is excellent. It has a heat shielding property.

遮熱層30を基材の一方の面に設ける方法としては、既設の農業用シートに適用できることが好ましいことから、遮熱層30の材料を含む塗料を作成し、これを基材20の一方の面に塗布できることが好ましい。具体的には、ベース樹脂31の分散液に遮熱材32を添加した塗料を作成し、噴霧器を用いて、ベース樹脂31の一方の面に塗布して乾燥後、遮熱層30を形成するものである。 As a method of providing the heat shield layer 30 on one side of the base material, it is preferable that it can be applied to existing agricultural sheets. It is preferable that it can be applied to the surface of Specifically, a paint is prepared by adding the heat shielding material 32 to the dispersion liquid of the base resin 31, and is applied to one surface of the base resin 31 using a sprayer. After drying, the heat shielding layer 30 is formed. It is a thing.

既設の農業用シートを構成する基材に塗布することを考慮すると、遮熱層30の材料を含む塗料としては水系塗料が好ましい。加えて、噴霧器で噴霧することから、塗料が噴霧器で目詰まりしないような塗料の固形成分の適度な分散性が必要となる。 Water-based paint is preferable as the paint containing the material of the heat shield layer 30, considering that it is applied to the substrate constituting the existing agricultural sheet. In addition, since the paint is sprayed with an atomizer, it is necessary to have an appropriate dispersibility of the solid components of the paint so that the paint does not clog the atomizer.

遮熱シート10の遮熱性能としては、上述の通り、近赤外線は反射しやすく、可視光線は遮蔽しにくいものが好ましい。具体的には、赤外線領域(波長領域として780~2500nm)における日射反射率が27%以上である。 As for the heat shielding performance of the heat shielding sheet 10, as described above, it is preferable that near-infrared rays are easily reflected and visible rays are difficult to be shielded. Specifically, the solar reflectance in the infrared region (780 to 2500 nm as a wavelength region) is 27% or more.

基材に対する遮熱層の密着性としては、基材の一方の面に遮熱層を形成した状態で、初期及びサンシャインウェザオメーターによる促進耐候性試験(JIS K 7350-4:2008 プラスチック-実験室光源による暴露試験方法-第4部:オープンフレームカーボンアークランプに準拠)において、試験時間24時間後、塗膜の脱落が目視で確認されないことである。これにより、屋外設置から概ね1~3ヶ月は基材の表面に遮熱層が保持されていることが期待される。 As the adhesion of the heat shield layer to the base material, the initial and accelerated weather resistance tests using a sunshine weatherometer (JIS K 7350-4: 2008 Plastics - Experiment In the room light source exposure test method-Part 4: based on open frame carbon arc lamp), no peeling off of the coating film is visually observed after 24 hours of the test. As a result, it is expected that the heat shield layer will be maintained on the surface of the base material for about 1 to 3 months after outdoor installation.

次に、本発明に係る遮熱シートの実施例を示す。 Next, examples of the heat shield sheet according to the present invention are shown.

(実施例1)
基材10としては、ポリオレフィンシート(三菱ケミカルアグリドリーム社製 ダイヤスター、三菱ケミカルアグリドリーム社製スーパーダイヤスター、昭和パックス社製農サクビ)の3種類を準備した。
遮熱層のベース樹脂としては、ポリ乳酸エマルション(ミヨシ油脂社製 ランディー PL-3000、固形分量40重量%)、天然ゴムエマルション(レジテックス社製 ULACOL、固形分量40重量%)を9:1の割合で混練したベース樹脂エマルションを作製した。更に、ベース樹脂エマルション250重量部(固形分量として100重量部)に対して、遮熱材として、細粒子(テイカ社製赤外線遮蔽酸化チタン JR-1000 平均粒子径:1.1μm)11.1重量部、粗粒子としてパール顔料(日本光研工業社製 TWINCLEPEARL RXE 平均粒子径:36μm)115.6重量部を添加して、遮熱層を形成するための塗料を作製した。この塗料を用いて、乾燥塗膜重量が1.0mg/m以上となるように噴霧器(株式会社工進社製 背負い式エンジン動噴機 ES-10C)で3種類の基材にそれぞれ塗布し、乾燥させて遮熱シートを作製した。
(Example 1)
As the substrate 10, three types of polyolefin sheets (Diastar manufactured by Mitsubishi Chemical Agridream, Super Diastar manufactured by Mitsubishi Chemical Agridream, and Agricultural Sakubi manufactured by Showa Pax) were prepared.
As the base resin of the heat shield layer, polylactic acid emulsion (Randy PL-3000 manufactured by Miyoshi Oil Co., Ltd., solid content 40% by weight) and natural rubber emulsion (ULACOL manufactured by Resitex Co., Ltd., solid content 40% by weight) were mixed at a ratio of 9:1. A base resin emulsion was prepared by kneading in proportions. Further, 11.1 parts by weight of fine particles (Tyka's infrared shielding titanium oxide JR-1000 average particle diameter: 1.1 μm) as a heat shielding material for 250 parts by weight of the base resin emulsion (100 parts by weight as solid content) and 115.6 parts by weight of a pearl pigment (TWINCLEPEARL RXE manufactured by Nihon Koken Kogyo Co., Ltd., average particle size: 36 μm) as coarse particles was added to prepare a paint for forming a heat shield layer. Using this paint, it was applied to each of the three substrates with a sprayer (manufactured by Koshinsha Co., Ltd., shoulder-mounted engine motor injector ES-10C) so that the dry coating weight was 1.0 mg/m 2 or more, It was dried to produce a heat shield sheet.

(吹付け性)
遮熱層を形成するための塗料を噴霧器で基材に吹き付ける際の噴霧状態を確認した。噴霧器で正常に噴霧できた場合は評価を「○」とし、噴霧器で異常(目詰まり)が発生した場合は評価を「×」とした。評価結果を表1に表す。
(Sprayability)
The state of spraying the paint for forming the heat shielding layer on the base material with a sprayer was checked. When the sprayer was able to spray normally, the evaluation was given as "○", and when the sprayer was abnormal (clogging), the evaluation was given as "x". Table 1 shows the evaluation results.

(初期密着性)
作製した遮熱シートについて、塗料乾燥後の状態で目視による外観観察を実施した。3種類の基材10に対して、いずれも塗膜の脱落が認められない場合は評価を「○」とし、3種類の基材10に対して、ひとつでも塗膜の脱落が認められる場合は評価を「×」とした。評価結果を表1に示す。
(Initial adhesion)
The appearance of the produced heat shield sheet was visually observed after the paint was dried. If the coating film does not fall off from any of the three types of substrates 10, the evaluation is given as "○". Evaluation was made into "x". Table 1 shows the evaluation results.

(密着耐久性)
作製した遮熱シートについて、遮熱層側が光源側になるように配置して促進耐候性試験24時間後に目視による外観観察を実施した。塗膜の脱落が認められない場合は評価を「○」とし、塗膜の脱落が認められる場合は評価を「×」とした。評価結果を表1に示す。
(Adhesion durability)
The produced heat shield sheet was placed so that the heat shield layer side was on the light source side, and the external appearance was visually observed after 24 hours of the accelerated weather resistance test. When no peeling of the coating film was observed, the evaluation was given as "○", and when peeling of the coating film was observed, the evaluation was given as "X". Table 1 shows the evaluation results.

(日射反射率)
上述の遮熱層を形成するための塗料をポリオレフィンシート(三菱アグリドリームケイカル社製 ダイヤスター)に塗布し、乾燥塗膜重量が1.0mg/mとなるように小型エアースプレーガン(アネスト岩田株式会社製 小型スプレーガン WIDER1)で基材に塗布し、40℃で1時間乾燥させて遮熱層付きガラス板を作製した。これを、自記分光光度計(日立ハイテクサイエンス社製、UH4150)を用いて、φ60積分球を使用し、780~2500nmの分光反射率を測定し、JIS K5600 塗膜の日射反射率の求め方に準拠し、近赤外線領域における日射反射率を求めた。日射反射率が27%以上の場合は評価を「○」とし、日射反射率が27%未満の場合は評価を「×」とした。評価結果を表1に示す。
(solar reflectance)
A polyolefin sheet (Diastar manufactured by Mitsubishi Agri-Dream Keical Co., Ltd.) is coated with the paint for forming the heat shield layer described above, and a small air spray gun (Anest Iwata A small spray gun WIDER 1) manufactured by Co., Ltd. was applied to the base material and dried at 40° C. for 1 hour to prepare a glass plate with a heat shield layer. Using a self-recording spectrophotometer (UH4150, manufactured by Hitachi High-Tech Science Co., Ltd.), using a φ60 integrating sphere, the spectral reflectance of 780 to 2500 nm is measured, and JIS K5600 is used to determine the solar reflectance of a coating film. The solar reflectance in the near-infrared region was determined according to the When the solar reflectance was 27% or more, the evaluation was given as "Good", and when the solar reflectance was less than 27%, the evaluation was given as "Poor". Table 1 shows the evaluation results.

(実施例2)
遮熱層を形成するための塗料において、遮熱層のベース樹脂として、ポリ乳酸エマルションと天然ゴムエマルションとを1:1の割合で混練した以外は、実施例1と同様にして遮蔽シートを得た。実施例1と同様に、吹き付け性、初期密着性、密着耐久性、日射反射率の評価試験結果を表1に示す。
(Example 2)
A shielding sheet was obtained in the same manner as in Example 1, except that in the paint for forming the heat shielding layer, a polylactic acid emulsion and a natural rubber emulsion were kneaded at a ratio of 1:1 as the base resin of the heat shielding layer. rice field. As in Example 1, Table 1 shows the evaluation test results of sprayability, initial adhesion, adhesion durability, and solar reflectance.

(実施例3)
遮熱層を形成するための塗料において、ベース樹脂エマルション250重量部(固形分量として100重量部)に対して、遮熱材として、細粒子11.1重量部、粗粒子としてパール顔料57.8重量部を添加した以外は、実施例1と同様にして遮蔽シートを得た。実施例1と同様に、吹き付け性、初期密着性、密着耐久性、日射反射率の評価試験結果を表1に示す。
(Example 3)
In the paint for forming the heat shielding layer, 11.1 parts by weight of fine particles as heat shielding material and 57.8 parts by weight of pearl pigment as coarse particles are added to 250 parts by weight of base resin emulsion (100 parts by weight as solid content). A shielding sheet was obtained in the same manner as in Example 1, except that parts by weight were added. As in Example 1, Table 1 shows the evaluation test results of sprayability, initial adhesion, adhesion durability, and solar reflectance.

(実施例4)
遮熱層を形成するための塗料において、遮熱層のベース樹脂として、ポリ乳酸エマルションと天然ゴムエマルションとを1:1の割合で混練し、ベース樹脂エマルション250重量部(固形分量として100重量部)に対して、遮熱材として、細粒子11.1重量部、粗粒子としてパール顔料57.8重量部を添加した以外は、実施例1と同様にして遮蔽シートを得た。実施例1と同様に、吹き付け性、初期密着性、密着耐久性、日射反射率の評価試験結果を表1に示す。
(Example 4)
In the paint for forming the heat shield layer, as the base resin of the heat shield layer, a polylactic acid emulsion and a natural rubber emulsion are kneaded at a ratio of 1:1, and 250 parts by weight of the base resin emulsion (100 parts by weight as a solid content) ), a shielding sheet was obtained in the same manner as in Example 1, except that 11.1 parts by weight of fine particles as a heat shielding material and 57.8 parts by weight of a pearl pigment as coarse particles were added. As in Example 1, Table 1 shows the evaluation test results of sprayability, initial adhesion, adhesion durability, and solar reflectance.

(実施例5)
遮熱層を形成するための塗料において、ベース樹脂エマルション250重量部(固形分量として100重量部)に対して、遮熱材として、細粒子22.2重量部、粗粒子としてパール顔料57.8重量部を添加した以外は、実施例1と同様にして遮蔽シートを得た。実施例1と同様に、吹き付け性、初期密着性、密着耐久性、日射反射率の評価試験結果を表1に示す。
(Example 5)
In the paint for forming the heat shield layer, 22.2 parts by weight of fine particles as heat shield material and 57.8 parts by weight of pearl pigment as coarse particles are added to 250 parts by weight of base resin emulsion (100 parts by weight as solid content). A shielding sheet was obtained in the same manner as in Example 1, except that parts by weight were added. As in Example 1, Table 1 shows the evaluation test results of sprayability, initial adhesion, adhesion durability, and solar reflectance.

(比較例1)
遮熱層を形成するための塗料において、遮熱材として、細粒子11.1重量部、粗粒子としてパール顔料28.9重量部を添加した以外は、実施例1と同様にして遮蔽シートを得た。実施例1と同様に、吹き付け性、初期密着性、密着耐久性、日射反射率の評価試験結果を表1に示す。
(Comparative example 1)
A shielding sheet was prepared in the same manner as in Example 1, except that 11.1 parts by weight of fine particles as a heat shielding material and 28.9 parts by weight of a pearl pigment as coarse particles were added to the paint for forming the heat shielding layer. Obtained. As in Example 1, Table 1 shows the evaluation test results of sprayability, initial adhesion, adhesion durability, and solar reflectance.

(比較例2)
遮熱層を形成するための塗料において、遮熱材として、細粒子を加えず、粗粒子としてパール顔料57.8重量部を添加した以外は、実施例1と同様にして遮蔽シートを得た。実施例1と同様に、吹き付け性、初期密着性、密着耐久性、日射反射率の評価試験結果を表1に示す。
(Comparative example 2)
A shielding sheet was obtained in the same manner as in Example 1, except that 57.8 parts by weight of pearl pigment was added as coarse particles instead of fine particles as the heat shielding material in the paint for forming the heat shielding layer. . As in Example 1, Table 1 shows the evaluation test results of sprayability, initial adhesion, adhesion durability, and solar reflectance.

(比較例3)
遮熱層を形成するための塗料において、遮熱材として、細粒子を加えず、細粒子5.6重量部、粗粒子としてパール顔料重量部を添加した以外は、実施例1と同様にして遮蔽シートを得た。実施例1と同様に、吹き付け性、初期密着性、密着耐久性、日射反射率の評価試験結果を表1に示す。
(Comparative Example 3)
In the paint for forming the heat shield layer, the same procedure as in Example 1 was performed except that 5.6 parts by weight of fine particles were added as the heat shield material, and 5.6 parts by weight of the fine particles were added as the coarse particles, and parts by weight of the pearl pigment were added as the coarse particles. A shielding sheet was obtained. As in Example 1, Table 1 shows the evaluation test results of sprayability, initial adhesion, adhesion durability, and solar reflectance.

(比較例4)
遮熱層を形成するための塗料において、遮熱層のベース樹脂として、天然ゴムエマルションのみを用いたこと以外は、実施例1と同様に、この塗料を用いて噴霧器で基材に塗布する際、噴霧器に目詰まりが発生したので、遮熱シートを作製できなかった。このため、初期密着性、密着耐久性、日射反射率の評価試験は実施しなかった。
(Comparative Example 4)
In the paint for forming the heat shield layer, except that only the natural rubber emulsion was used as the base resin of the heat shield layer, in the same manner as in Example 1, when this paint was used to apply to the substrate with a sprayer, , the sprayer was clogged, so the heat shield sheet could not be produced. Therefore, evaluation tests for initial adhesion, adhesion durability, and solar reflectance were not conducted.

(比較例5)
遮熱層を形成するための塗料において、遮熱層のベース樹脂として、ポリ乳酸エマルションのみを用いたこと以外は、実施例1と同様にして遮蔽シートを得た。実施例1と同様に、吹き付け性、初期密着性、密着耐久性、日射反射率の評価試験結果を表1に示す。
(Comparative Example 5)
A shielding sheet was obtained in the same manner as in Example 1, except that in the paint for forming the heat shielding layer, only the polylactic acid emulsion was used as the base resin of the heat shielding layer. As in Example 1, Table 1 shows the evaluation test results of sprayability, initial adhesion, adhesion durability, and solar reflectance.

(比較例6)
遮熱層を形成するための塗料において、遮熱層のベース樹脂として、ポリ乳酸エマルションのみを用い、遮熱材として、細粒子11.1重量部、粗粒子としてパール顔料57.8重量部を添加した以外は、実施例1と同様にして遮蔽シートを得た。実施例1と同様に、吹き付け性、初期密着性、密着耐久性、日射反射率の評価試験結果を表1に示す。
(Comparative Example 6)
In the paint for forming the heat shield layer, only polylactic acid emulsion is used as the base resin of the heat shield layer, and 11.1 parts by weight of fine particles are used as the heat shield material, and 57.8 parts by weight of the pearl pigment is used as the coarse particles. A shielding sheet was obtained in the same manner as in Example 1, except that it was added. As in Example 1, Table 1 shows the evaluation test results of sprayability, initial adhesion, adhesion durability, and solar reflectance.

Figure 2022178562000002
Figure 2022178562000002

以上、実施例1~5及び比較例1~6の結果からも明らかなように、本発明の遮熱シートは、遮熱層を形成するための塗料において、優れた吹き付け性を示すとともに、初期密着性、密着耐候性、日射反射率においても優れた性能を有することが分かった。 As is clear from the results of Examples 1 to 5 and Comparative Examples 1 to 6, the heat shield sheet of the present invention exhibits excellent sprayability in the paint for forming the heat shield layer, and the initial It was found to have excellent performance in terms of adhesion, adhesion weather resistance, and solar reflectance.

加えて、遮熱層のベース樹脂において、ポリ乳酸のみでは十分な密着耐候性が確保できず、また、遮熱層の遮熱材において、無機物が少ないと十分な日射反射率が確保できないことが分かった。 In addition, in the base resin of the heat shield layer, sufficient adhesion and weather resistance cannot be ensured with only polylactic acid, and in the heat shield material of the heat shield layer, sufficient solar reflectance cannot be ensured if there are few inorganic substances. Do you get it.

更に、実施例3と比較例2~3とを対比すると、遮熱層の遮熱材において、細粒子は添加量が比較的少ない場合は、日射反射率の性能向上への寄与が大きいが、実施例3に対して、実施例1と実施例5とを対比すると、細粒子の添加量を増やしても、日射反射率の性能向上への寄与が比較的小さく、粗粒子の添加量を増やした方が日射反射率の性能向上への寄与が比較的大きい傾向が見られた。 Furthermore, when comparing Example 3 with Comparative Examples 2 and 3, in the heat shield material of the heat shield layer, when the amount of fine particles added is relatively small, the contribution to the performance improvement of the solar reflectance is large. Comparing Example 1 and Example 5 with respect to Example 3, even if the amount of fine particles added is increased, the contribution to the performance improvement of solar reflectance is relatively small, and the amount of coarse particles added is increased. There was a tendency that the contribution to the performance improvement of the solar reflectance was relatively large.

本発明に係る遮熱シートをビニールハウスやトンネル栽培で用いる農業用シートに適用することによって、特にハウス内やトンネル内の温度が上昇しやすい夏期において、温度上昇を抑えることが期待できる。加えて、農業用シートとして使用後は、耐候劣化により遮熱層が徐々に劣化、或いは基材に対する遮熱層の密着性の低下が予想され、自然に脱落、または、遮熱層の除去が容易な状態となり、冬期においては、遮熱層が除去された状態が期待される。また、脱落した遮熱層は地面に落ち、その後に生分解されることが期待されるから、環境への負荷を小さくすることができる。 By applying the heat shield sheet according to the present invention to agricultural sheets used in vinyl greenhouses and tunnel cultivation, it is expected that the temperature rise can be suppressed particularly in the summer when the temperature inside greenhouses and tunnels tends to rise. In addition, after being used as an agricultural sheet, it is expected that the heat shield layer will gradually deteriorate due to weather resistance deterioration, or that the adhesion of the heat shield layer to the base material will decrease, and the heat shield layer will fall off naturally or be removed. It is expected that the heat shield layer will be removed in winter. In addition, the dropped heat shielding layer falls to the ground and is expected to be biodegraded after that, so the load on the environment can be reduced.

10 遮熱シート
20 基材
30 遮熱層
31 ベース樹脂
32 遮熱材

10 heat shield sheet 20 base material 30 heat shield layer 31 base resin 32 heat shield material

Claims (2)

ポリオレフィンのシート状の基材の表面に、遮熱層が形成された遮熱シートであって、
可視光透過率が27%以上であり、
前記遮熱層は、ベース樹脂と遮熱材とを含み、
前記ベース樹脂は、天然ゴムとポリ乳酸とを含み、
前記遮熱材は、平均粒径10μm以下の細粒子と、平均粒径10μmを超える粗粒子とを含み、
前記細粒子は、ベース樹脂100重量部に対して10~20重量部含み、
前記粗粒子は、ベース樹脂100重量部に対して50~120重量部含む
ことを特徴とする遮熱シート。
A heat shield sheet in which a heat shield layer is formed on the surface of a polyolefin sheet-like base material,
Visible light transmittance is 27% or more,
The heat shield layer includes a base resin and a heat shield material,
The base resin contains natural rubber and polylactic acid,
The heat shield material contains fine particles with an average particle size of 10 μm or less and coarse particles with an average particle size of more than 10 μm,
The fine particles contain 10 to 20 parts by weight with respect to 100 parts by weight of the base resin,
A heat shield sheet, wherein the coarse particles are contained in an amount of 50 to 120 parts by weight with respect to 100 parts by weight of the base resin.
前記天然ゴムとポリ乳酸との配合比率(重量比率)は、天然ゴム:ポリ乳酸=5~55:95~45であり、
サンシャインウェザオメーターによる促進耐候試験24時間後において、遮熱層が基材に密着していることを特徴とする請求項1に記載の遮熱シート。
The blending ratio (weight ratio) of the natural rubber and polylactic acid is natural rubber:polylactic acid=5 to 55:95 to 45,
2. The heat shield sheet according to claim 1, wherein the heat shield layer is in close contact with the substrate after 24 hours of accelerated weather resistance test by a sunshine weatherometer.
JP2021085444A 2021-05-20 2021-05-20 Thermal insulation sheet Pending JP2022178562A (en)

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