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WO2018029997A1 - 断熱シートおよびその製造方法 - Google Patents

断熱シートおよびその製造方法 Download PDF

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Publication number
WO2018029997A1
WO2018029997A1 PCT/JP2017/023119 JP2017023119W WO2018029997A1 WO 2018029997 A1 WO2018029997 A1 WO 2018029997A1 JP 2017023119 W JP2017023119 W JP 2017023119W WO 2018029997 A1 WO2018029997 A1 WO 2018029997A1
Authority
WO
WIPO (PCT)
Prior art keywords
region
heat insulating
sheet
heat
protective
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/023119
Other languages
English (en)
French (fr)
Inventor
藤井　健史
一茂 小山
阿部　雄一
里佳子 庄野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Priority to JP2018532859A priority Critical patent/JP7050230B2/ja
Priority to CN201780046777.3A priority patent/CN109642695A/zh
Priority to US16/313,175 priority patent/US10948120B2/en
Publication of WO2018029997A1 publication Critical patent/WO2018029997A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
    • F16L59/029—Shape or form of insulating materials, with or without coverings integral with the insulating materials layered
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    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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Definitions

  • the present disclosure relates to a heat insulating sheet used as a heat insulating measure and a manufacturing method thereof.
  • Patent Document 1 is known as prior art document information related to this technology.
  • the above heat-insulating sheet is poor in adhesion and requires a protective sheet because silica xerogel is easily detached. Moreover, when the shape of a heat insulation sheet becomes large, it will become difficult to fix this heat insulation sheet.
  • the present disclosure aims to provide a heat insulating sheet that can be easily attached even when the shape is increased, and a method for manufacturing the same.
  • the present disclosure is a heat insulating sheet using a non-woven fabric and a heat insulating material supporting xerogel in a space inside the non-woven fabric, the heat insulating material including a first region in which xerogel is supported, and a heat insulating material. It consists of a second region that does not have xerogel inside the outer periphery of the body. And both surfaces of a heat insulating sheet are provided with a protective sheet, the protective sheets are joined around the heat insulator, and the protective sheet and the nonwoven fabric are joined in the second region.
  • the silica xerogel is sealed so as not to be detached, and can be welded to a housing or the like in the second region, so that a heat insulating sheet excellent in ease of attachment can be obtained.
  • FIG. 1 is a perspective view of a heat insulating sheet according to the first embodiment of the present disclosure
  • FIG. 2 is an exploded perspective view of the heat insulating sheet
  • FIG. 3 is a sectional view of the heat insulating sheet shown in FIG. It is sectional drawing.
  • the thickness of the first region 12 is about 0.5 mm
  • the thickness of the second region 13 is about 0.05 mm.
  • the second region 13 has a diameter of about 10 mm and is formed at a predetermined position.
  • the 2nd field 13 has composition which does not have space inside by melting and solidifying PET which constitutes nonwoven fabric 11. That is, the second region 13 is made of a material constituting the nonwoven fabric 11.
  • “having no space” means that there is no space entering from the outside to the inside, and a space completely closed from the outside may be included.
  • Protective sheets 15 made of PET having a thickness of about 0.05 mm are provided on both surfaces of the heat insulator 14.
  • the protective sheet 15 has a shape larger than that of the heat insulator 14, and the protective sheets 15 are joined to each other by heat fusion around the heat insulator 14. In the second region 13, the protective sheet 15 and the second region 13 are heat fused. It is joined by. With this configuration, the heat insulator 14 is sealed with the protective sheet 15. Moreover, since the 1st area
  • the adhesive layer may be formed in the bonding surface of the protective sheet 15, and the protective sheets 15 and the protective sheet 15 and the 2nd area
  • the protective sheet 15 is not a uniform sheet such as PET, but may be a non-woven fabric with a large basis weight, or a non-woven fabric impregnated with an oil repellent resin or an adhesive resin.
  • the protective sheet 15 can be fixed to the casing by performing a heat press from above the second region.
  • the non-woven fabric and the protective sheet 15 that have the same melting point even if they are the same type of thermoplastic resin or different materials.
  • region 13 may be a through-hole provided in the nonwoven fabric.
  • FIG. 4 is a perspective view of a heat insulating sheet according to the second embodiment of the present disclosure
  • FIG. 5 is an exploded perspective view of the heat insulating sheet.
  • 1 has a plurality of circular second regions 13 formed at predetermined positions.
  • the second regions 13 are provided in a grid pattern.
  • the width of the second region 13 is about 3 mm
  • the size of the first region 12 is about 30 mm square.
  • protective sheets 15 made of PET having a thickness of about 0.05 mm are provided on both surfaces of the heat insulator 14.
  • the protective sheet 15 has a shape larger than that of the heat insulator 14, and the protective sheets 15 are joined to each other by heat fusion around the heat insulator 14. It is joined by. With this configuration, the heat insulator 14 is sealed with the protective sheet 15. Furthermore, you may provide the slit 19 in a part of 2nd area
  • flame retardant fibers such as glass fibers may be used as the nonwoven fabric material.
  • the same thing can be obtained by soaking a thermoplastic resin in the part used as the 2nd field, and filling a space of a nonwoven fabric with a thermoplastic resin.
  • the nonwoven fabric may be formed by combining two or more kinds of fibers. For example, by making a nonwoven fabric with 50% or more of flame retardant fiber by weight and the remainder being PET, a heat insulating sheet that is excellent in flame resistance and inexpensive can be obtained.
  • a nonwoven fabric 11 made of PET having a thickness of about 0.5 mm is prepared.
  • the nonwoven fabric 11 is pressed against a heel set at a temperature higher than the melting point of PET to melt the pressed nonwoven fabric.
  • the thickness of the pressed portion is about 0.05 mm.
  • a portion having no space is referred to as a second region 13, and a portion having the space is referred to as a first region 12.
  • “having no space” means that there is no space entering from the outside to the inside, and a space completely closed from the outside may be included.
  • the nonwoven fabric 11 in which the second region 13 is formed is immersed in a sol solution obtained by adding hydrochloric acid to a sodium silicate aqueous solution, for example, and the internal space of the first region is impregnated with the sol solution.
  • the sol solution does not enter the second region 13 because there is no space from the outside to the inside.
  • the sol solution is gelled, hydrophobized, and dried to fill the space in the first region 12 with silica xerogel.
  • the space of the 1st field 12 is impregnated with xerogel, and as for 2nd field 13, heat insulation 14 only for the raw material of a nonwoven fabric is obtained.
  • a protective sheet 15 having a shape larger than that of the heat insulator 14 is stacked on both surfaces of the heat insulator 14, and the protective sheets 15 are joined to each other by hot pressing around the heat insulator 14. In the second region 13, the protective sheet 15 and the second region 13 is joined by hot press to obtain a heat insulating sheet.
  • the heat insulator 14 is sealed by the protective sheet 15. Moreover, since the 1st area
  • the heat insulating sheet has a recessed portion 18 in which at least one second region 13 is recessed from the surrounding first region 12.
  • a non-flammable resin such as acrylic oxide may be used as the nonwoven fabric material.
  • a thermoplastic resin sheet is stacked on the portion to be the second region 13 and hot pressing is performed, or the molten thermoplastic resin is soaked into the portion to be the second region, and the nonwoven fabric space is filled with the thermoplastic resin. By doing so, the same thing can be obtained.
  • the size and thickness of the heat insulating sheet shown in the present disclosure are examples, and the size and thickness of the heat insulating sheet can take various values depending on the application. Moreover, the thickness and magnitude
  • region 13 are not restricted to the said value, Various values can be taken.
  • the heat insulating sheet and the manufacturing method thereof according to the present disclosure can obtain a heat insulating sheet excellent in ease of attachment, and are industrially useful.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Thermal Insulation (AREA)
  • Laminated Bodies (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Nonwoven Fabrics (AREA)

Abstract

形状が大きくなっても取り付けやすい断熱シートおよびその製造方法を提供することを目的としている。不織布（１１）とこの不織布（１１）の内部の空間にキセロゲルを担持した断熱体（１４）を用いた断熱シートであって、断熱体（１４）はキセロゲルが担持された第１領域（１２）と、断熱体（１４）の外周よりも内側でキセロゲルを有しない第２領域（１３）とからなる。断熱体（１４）の両面には保護シート（１５）が設けられ、断熱体（１４）の周囲および第２領域（１３）では、保護シート（１５）同士あるいは保護シート（１５）と第２領域（１３）とが接合されているように構成したものである。

Description

断熱シートおよびその製造方法
　本開示は、断熱対策として用いられる断熱シートおよびその製造方法に関するものである。
　近年省エネルギー化が大きく叫ばれているが、その実現方法として機器の保温によりエネルギー効率を向上させるものもある。この保温を実現するために、断熱効果に優れた断熱シートが求められている。そのため、不織布にシリカキセロゲルを担持させることにより空気よりも熱伝導率を低くした断熱シートを用いることがある。
　なお、この技術に関連する先行技術文献情報としては、例えば、特許文献１が知られている。
特開２０１１－１３６８５９号公報
　しかしながら上記断熱シートは、接着性に乏しく、またシリカキセロゲルが離脱しやすいため保護シートが必要となる。また断熱シートの形状が大型化してくると、この断熱シートを固定することが難しくなってくる。
　本開示はこの課題に対して、形状が大きくなっても取り付けやすい断熱シートおよびその製造方法を提供することを目的とする。
　本開示は上記課題を解決するために、不織布とこの不織布の内部の空間にキセロゲルを担持した断熱体を用いた断熱シートであって、この断熱体はキセロゲルが担持された第１領域と、断熱体の外周よりも内側でキセロゲルを有しない第２領域とからなる。そして断熱シートの両面は保護シートが設けられ、断熱体の周囲では保護シート同士が接合され、第２領域では保護シートと不織布とが接合されるように構成したものである。
　上記のように構成することにより、シリカキセロゲルが離脱しないように封止され、第２領域で筐体等に溶着させることができ、取り付けやすさに優れた断熱シートを得ることができる。
本開示の第１の実施形態における断熱シートの斜視図 同断熱シートの分解斜視図 同断熱シートの断面図 本開示の第２の実施形態における断熱シートの斜視図 同断熱シートの分解斜視図 本開示の第３の実施形態にて示す断熱シートの製造方法における、断熱シートを取り付ける時の分解斜視図 図６に用いる断熱シートの断面図
　以下、本開示の実施の形態における断熱シートについて、図面を参照しながら説明する。
　（第１の実施形態）
　図１は本開示の第１の実施形態における断熱シートの斜視図であり、図２は同断熱シートの分解斜視図であり、図３は図１に示す断熱シートを３－３線で切った断面図である。
　断熱体１４は、内部に空間を有する第１領域１２と、内部に空間を有しない第２領域１３とを有するポリエチレンテレフタレート（以下ＰＥＴと記す）からなる不織布１１の第１領域１２の空間にシリカキセロゲルを担持させることにより構成されている。シリカキセロゲルは、空気分子の運動を規制するナノサイズの空隙構造を有しており、この断熱体の熱伝導率は、０．０１８～０．０２４Ｗ／ｍ・Ｋとなっている。
　ここで第１領域１２の厚さは約０．５ｍｍ、第２領域１３の厚さは約０．０５ｍｍとなっている。第２領域１３は直径約１０ｍｍの大きさで、所定の位置に形成されている。第２領域１３は不織布１１を構成するＰＥＴを溶かして固めることにより、内部に空間を有しない構成となっている。すなわち第２領域１３は不織布１１を構成する素材で構成されている。ここで空間を有しないとは、外部から内部に入る空間がないという意味であって、外部から完全に閉ざされた空間は含まれていてもかまわない。
　この断熱体１４の両面には厚さ約０．０５ｍｍのＰＥＴからなる保護シート１５が設けられている。保護シート１５は断熱体１４よりも大きな形状で、断熱体１４の全周囲で保護シート１５同士が熱融着により接合され、第２領域１３では保護シート１５と第２領域１３とが熱融着により接合されている。このように構成することにより断熱体１４は保護シート１５により封止されている。また第１領域１２と保護シート１５とは接合されていないが、第２領域１３では保護シート１５と接合されているため、保護シート１５の浮きを防止することができる。なお、保護シート１５の貼り合わせ面に粘着層を形成しておき、保護シート１５同士および保護シート１５と第２領域１３とを粘着層により接合したものであってもかまわない。
　なお、保護シート１５は、ＰＥＴのような均一のシートではなく、目付けが大きい不織布、あるいは不織布に撥油性樹脂あるいは接着性樹脂等を含浸させたものを用いてもかまわない。
　さらにプラスチック製の筐体の内側に取り付けようとするとき、第２領域の上から熱プレスを行うことにより、筐体に保護シート１５を固定することができる。このためには、不織布および保護シート１５には同一系統の熱可塑性樹脂あるいは異なる材料であっても融点が近いものを用いることが望ましい。
　なお第２領域１３は、不織布に設けた貫通孔であってもかまわない。このようにすることで、断熱体の周囲および第２領域１３で保護シート同士を接合することにより、断熱体１４を保護シート１５で封止することができる。さらに第２領域１３は保護シート１５のみとなっているため、この部分で筐体等に接合させることができる。
　（第２の実施形態）
　図４は本開示の第２の実施形態における断熱シートの斜視図であり、図５は同断熱シートの分解斜視図である。図１の断熱シートは、円状の第２領域１３が複数個所定に位置に形成されたものであるが、図４の断熱シートでは、第２領域１３が格子状に設けられている。第２領域１３の幅は約３ｍｍ、第１領域１２の大きさは約３０ｍｍ角となっている。図１の場合と同様に、断熱体１４の両面には厚さ約０．０５ｍｍのＰＥＴからなる保護シート１５が設けられている。保護シート１５は断熱体１４よりも大きな形状で、断熱体１４の全周囲で保護シート１５同士が熱融着により接合され、第２領域１３では保護シート１５と第２領域１３とが熱融着により接合されている。このように構成することにより断熱体１４は保護シート１５により封止されている。さらに第２領域１３の一部およびこれに接合された保護シート１５の一部に、スリット１９を設けても良い。このようにすることにより、断熱シートに力が加わった場合、加わった力はスリット１９を広げる方に使われ、第１領域１２にかかる力を軽減することができ、外力に強い断熱シートを得ることができる。
　なお、不織布の素材としてガラス繊維のような難燃繊維を用いてもかまわない。この場合、熱可塑性樹脂を第２領域となる部分にしみこませ、不織布の空間に熱可塑性樹脂を充填することにより、同様のものを得ることができる。
　また、不織布としては２種類以上の繊維を組み合わせて形成したものであってもかまわない。例えば重量比で難燃繊維が５０％以上、残りをＰＥＴとした不織布を作ることにより、耐燃性に優れ、安価な断熱シートを得ることができる。
　（第３の実施形態）
　次に、本開示の第１実施形態における断熱シートの製造方法について、第３の実施形態にて説明する。
　まず厚さ約０．５ｍｍのＰＥＴからなる不織布１１を準備する。この不織布１１にＰＥＴの融点より高い温度に設定した鏝を押し当て、押し当てた部分の不織布を溶融させる。この押し当てられた部分の厚さは約０．０５ｍｍとなっている。不織布１１そのものの内部には空間が存在するが、ＰＥＴが溶融して固化した部分は空間がなくなっている。この空間を有しない部分を第２領域１３、空間が存在する部分を第１領域１２と称す。ここで空間を有しないとは、外部から内部に入る空間がないという意味であって、外部から完全に閉ざされた空間は含まれていてもかまわない。
　この第２領域１３を形成した不織布１１を例えばケイ酸ナトリウム水溶液に塩酸を添加してなるゾル溶液に浸漬し、第１領域の内部空間の中にゾル溶液を含浸させる。このとき第２領域１３には外部から内部に入る空間がないため、ゾル溶液は入らない。このゾル溶液をゲル化させ、疎水化、乾燥することにより、第１領域１２内の空間にシリカキセロゲルを充填させる。このようにすることにより、第１領域１２の空間にキセロゲルが含浸され、第２領域１３は不織布の素材だけの断熱体１４が得られる。この断熱体１４の両面に断熱体１４よりも形状の大きな保護シート１５を重ね、断熱体１４の周囲では保護シート１５同士を熱プレスにより接合し、第２領域１３では保護シート１５と第２領域１３とを熱プレスにより接合して、断熱シートを得る。
　このように構成することにより断熱体１４は保護シート１５により封止されている。また第１領域１２と保護シート１５とは接合されていないが、第２領域１３では保護シート１５と接合されているため、保護シート１５の浮きを防止することができる。さらに第２領域１３ではシリカキセロゲルがなく、保護シートと不織布の素材で構成されているため、この上から熱プレスすることにより、筐体等に接合することができる。
　なおプラスチック製の筐体に熱プレスするときには図６のように、筐体１６の接合する部分に突起１７を設けておくことが望ましい。さらに図７のように断熱シートは少なくとも一面の第２領域１３が周辺の第１領域１２よりも凹んだ凹部１８にすることが望ましい。このようにすることにより、突起１７が凹部１８に入るようにすることで、位置あわせが容易となり、また突起の厚さで接合時の突起とは反対側の面の変形を防止することができる。
　なお、不織布の素材として酸化アクリルのような不燃性に優れた樹脂を用いてもかまわない。この場合、第２領域１３となる部分に、熱可塑性樹脂シートを重ねて熱プレスを行う、あるいは溶融した熱可塑性樹脂を第２領域となる部分にしみこませ、不織布の空間に熱可塑性樹脂を充填することにより、同様のものを得ることができる。
　また、本開示にて示す断熱シートの大きさや厚さは一例であり、断熱シートの大きさや厚さは用途に応じて様々な値をとりうる。また、不織布１１、第１領域１２および第２領域１３の厚さや大きさは、上記値に限られず、様々な値をとりうる。
　本開示に係る断熱シートおよびその製造方法は、取り付けやすさに優れた断熱シートを得ることができ、産業上有用である。
　１１　不織布
　１２　第１領域
　１３　第２領域
　１４　断熱体
　１５　保護シート
　１６　筐体
　１７　突起
　１８　凹部
　１９　スリット

Claims (9)

  1. 　不織布とこの不織布の内部の空間にキセロゲルを担持した断熱体を用いた断熱シートであって、前記断熱体は前記キセロゲルが担持された第１領域と、前記断熱体の外周よりも内側でキセロゲルを有しない第２領域とからなり、前記断熱体の両面には保護シートが設けられ、前記断熱体の周囲および前記第２領域では、前記保護シート同士あるいは前記保護シートと前記第２領域とが接合されていることを特徴とする断熱シート。
  2. 　前記断熱体の周囲では前記保護シート同士が接合され、前記第２領域では前記保護シートと前記第２領域とが接合されていることを特徴とする請求項１記載の断熱シート。
  3. 　前記第２領域が格子状に設けられていることを特徴とする請求項２記載の断熱シート。
  4. 　前記第２領域が複数個点在するように設けられていることを特徴とする請求項１記載の断熱シート。
  5. 　前記不織布および前記保護シートは熱可塑性樹脂からなることを特徴とする請求項１記載の断熱シート。
  6. 　前記第２領域およびこれに接合された前記保護シートの一部にはスリットが設けられていることを特徴とする請求項３記載の断熱シート。
  7. 　内部に空間を有する不織布の一部に内部に空間を有さない第２領域を形成する工程と、前記第２領域を形成した前記不織布を所定のゾル溶液に浸漬し、前記第２領域以外の第１領域の空間にキセロゲルを含浸させて断熱体を得る工程と、前記断熱体の両面に保護シートを重ね、前記断熱体の周囲および前記第２領域では、前記保護シート同士あるいは前記保護シートと前記第２領域とを接合する工程とを備えた断熱シートの製造方法。
  8. 　前記第２領域は前記不織布の一部に熱プレスを行うことによって形成する請求項７記載の断熱シートの製造方法。
  9. 　前記保護シート同士または前記保護シートと前記不織布とは、熱融着により接合されていることを特徴とする請求項７記載の断熱シートの製造方法。
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Cited By (6)

* Cited by examiner, † Cited by third party
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WO2018230343A1 (ja) * 2017-06-16 2018-12-20 パナソニックＩｐマネジメント株式会社 断熱シートおよびこれを用いた積層断熱シート
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