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JP2012087182A - Heat-shielding adhesive tape - Google Patents

Heat-shielding adhesive tape Download PDF

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JP2012087182A
JP2012087182A JP2010233255A JP2010233255A JP2012087182A JP 2012087182 A JP2012087182 A JP 2012087182A JP 2010233255 A JP2010233255 A JP 2010233255A JP 2010233255 A JP2010233255 A JP 2010233255A JP 2012087182 A JP2012087182 A JP 2012087182A
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heat
pressure
sensitive adhesive
heat storage
storage material
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Yukinori Yamada
幸憲 山田
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Maxell Ltd
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Hitachi Maxell Ltd
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Abstract

【課題】遮熱用粘着テープを貼付した対象物が、近傍の熱源からの輻射熱による極端な温度上昇を起こさないように、十分な遮熱効果が得られると共に、貼付した対象物に対して、十分な接着性も確保した遮熱用粘着テープを提供することである。
【解決手段】基材の片面に金属層、反対面に粘着層が形成されており、粘着層が、潜熱蓄熱材を含む粘着剤層と、該粘着剤層の基材側でない側の上に少なくとも一層の潜熱蓄熱材を含まない粘着剤層とから構成されている。
【選択図】図1
[PROBLEMS] To obtain a sufficient heat shielding effect so that an object to which an adhesive tape for heat shielding is applied does not cause an extreme temperature rise due to radiant heat from a nearby heat source, An object of the present invention is to provide a heat-shielding pressure-sensitive adhesive tape that ensures sufficient adhesion.
A metal layer is formed on one side of a base material, and an adhesive layer is formed on the opposite side. The adhesive layer includes an adhesive layer containing a latent heat storage material, and a side of the adhesive layer that is not on the base material side. It is comprised from the adhesive layer which does not contain at least one latent heat storage material.
[Selection] Figure 1

Description

本発明は、粘着テープに関し、さらに詳しくは、粘着テープの接着面と反対側の環境温度の変化に対して、貼付した対象物の温度変化が緩和される遮熱用粘着テープに関する。 The present invention relates to a pressure-sensitive adhesive tape, and more particularly, to a heat-shielding pressure-sensitive adhesive tape in which a change in temperature of an attached object is mitigated with respect to a change in environmental temperature on the side opposite to the adhesive surface of the pressure-sensitive adhesive tape.

区切られた空間内や筺体内に高熱源体がある場合、添付した対象物を熱源から保護する目的で、遮熱用粘着テープが用いられる。電子機器の部材や自動車のエンジンルームの部材などに使われる。たとえば、電子機器内部にある熱源の熱から電気配線や外装を保護するために、特許文献1の畜熱性粒子を粘着剤に分散した例や、特許文献2の基材に金属箔を有する粘着テープが開示されている。 また、特許文献3には、自動車のワイヤーハーネスを保護、結束する等に使用される遮熱用粘着テープが開示されている。ここで、潜熱蓄熱剤は、通常、個体−液体の相変化を利用して放熱作用(又は吸熱作用)を発揮するものであり、吸熱容量が比較的大きい。そして、0〜110℃にて相変化する素材である。
しかしながら、特許文献2や3に提案された粘着テープでは遮熱効果が不十分であった。特許文献1での畜熱性粒子を粘着剤に分散する考案は、遮熱効果は良好なものの、蓄熱性粒子が非粘着性材料であるため、混入によって接着力が低下する。
特開2001−303006号公報 特開2003−183603号公報 特開2010−053208号公報
When there is a high heat source in the partitioned space or inside the housing, a heat shielding adhesive tape is used for the purpose of protecting the attached object from the heat source. It is used for electronic device parts and automobile engine room parts. For example, in order to protect the electrical wiring and the exterior from the heat of the heat source inside the electronic device, an example in which livestock particles of Patent Document 1 are dispersed in an adhesive, or an adhesive tape having a metal foil on a base material of Patent Document 2 Is disclosed. Patent Document 3 discloses a heat-shielding pressure-sensitive adhesive tape used for protecting and binding an automobile wire harness. Here, the latent heat storage agent normally exhibits a heat dissipation action (or an endothermic action) by utilizing a solid-liquid phase change, and has a relatively large heat absorption capacity. And it is a raw material which changes a phase at 0-110 degreeC.
However, the adhesive tape proposed in Patent Documents 2 and 3 has an insufficient heat shielding effect. Although the idea which disperses the animal heat-resistant particle | grains in patent document 1 to an adhesive is good in the heat-shielding effect, since heat storage particle | grains are non-adhesive materials, adhesive force falls by mixing.
JP 2001-303006 A JP 2003-183603 A JP 2010-053208 A

本発明の目的は、遮熱用粘着テープを貼付した対象物が、近傍の熱源からの輻射熱による極端な温度上昇を起こさないように、十分な遮熱効果が得られると共に、貼付した対象物に対して、十分な接着性も確保した遮熱用粘着テープを提供することである。 The object of the present invention is to provide a sufficient heat-shielding effect so that the object to which the heat-shielding adhesive tape is affixed does not cause an extreme temperature rise due to radiant heat from a nearby heat source. On the other hand, it is to provide a heat-shielding pressure-sensitive adhesive tape having sufficient adhesiveness.

本発明の目的を達成するために、本発明の遮熱用粘着テープは、特許請求の範囲に記載のような構成とするものである。 In order to achieve the object of the present invention, the heat-shielding pressure-sensitive adhesive tape of the present invention is configured as described in the claims.

すなわち、本発明の遮熱用粘着テープは、基材の片面に金属層、反対面に粘着層が形成されており、粘着層が、潜熱蓄熱材を含む粘着剤層と、該粘着剤層の基材側でない側の上に少なくとも一層の潜熱蓄熱材を含まない粘着剤層とから構成されている。 That is, the heat shielding pressure-sensitive adhesive tape of the present invention has a metal layer on one side of the substrate and an adhesive layer on the opposite side, the pressure-sensitive adhesive layer comprising a latent heat storage material, and the pressure-sensitive adhesive layer. It is comprised from the adhesive layer which does not contain at least one layer of latent-heat storage material on the side which is not a base material side.

この場合、基材と金属層との間に、少なくとも一層の潜熱蓄熱材を含む粘着剤層を形成する構成とすることもできる。 In this case, it can also be set as the structure which forms the adhesive layer containing a latent heat storage material of at least one layer between a base material and a metal layer.

さらにこれらの場合、潜熱蓄熱材が、マイクロカプセルに封入され、粘着剤層中に分散している構成にすることもできる。 Further, in these cases, the latent heat storage material may be enclosed in the microcapsule and dispersed in the pressure-sensitive adhesive layer.

また、以上のような構成とした場合、相変化温度が0℃以上100℃以下で固液相変化をする潜熱蓄熱材を使用することが好ましい。 Moreover, when it is set as the above structures, it is preferable to use the latent heat storage material which changes a solid-liquid phase when phase change temperature is 0 degreeC or more and 100 degrees C or less.

潜熱蓄熱材は、材料の融点、凝固点(相変化温度)において、融解あるいは凝固が完了するまでの間、温度が一定となる(この時の吸熱、発熱エネルギーを潜熱という)。したがって、潜熱蓄熱材を含む系の温度は、相変化温度を跨いで変化した場合、一定時間相変化温度に固定される。この相変化温度を、遮熱用粘着テープを貼付した対象物近傍の熱源からの輻射熱によって上昇する遮熱用粘着テープの熱源側金属層の温度以下とすることで、遮熱用粘着テープを添付した対象物に直接伝導することがなく、遮熱用粘着テープの遮熱効果を大幅に向上することができる。 The latent heat storage material has a constant temperature at the melting point and freezing point (phase change temperature) of the material until melting or solidification is completed (heat absorption and heat generation energy at this time are referred to as latent heat). Therefore, when the temperature of the system including the latent heat storage material changes across the phase change temperature, it is fixed at the phase change temperature for a certain time. Attaching the heat-shielding adhesive tape by setting the phase change temperature to be equal to or lower than the temperature of the heat-source-side metal layer of the heat-shielding adhesive tape that rises due to radiant heat from the heat source near the object to which the heat-shielding adhesive tape is attached Therefore, the heat shielding effect of the heat shielding pressure-sensitive adhesive tape can be greatly improved.

上で述べた構成にすることで、潜熱蓄熱材による遮熱効果が得られて、かつ潜熱蓄熱材は、遮熱用粘着テープの粘着層が対象物と接着する表面には存在しないため、非粘着性である潜熱蓄熱材によって、接着力が低下することのない遮熱用粘着テープを提供できる。 With the configuration described above, a heat shielding effect by the latent heat storage material can be obtained, and the latent heat storage material does not exist on the surface where the adhesive layer of the heat shielding adhesive tape adheres to the object. With the latent heat storage material that is tacky, it is possible to provide a heat-shielding pressure-sensitive adhesive tape in which adhesive strength does not decrease.

本発明に係る遮熱用粘着テープの一例の構成を示す概略断面図である。It is a schematic sectional drawing which shows the structure of an example of the heat insulating adhesive tape which concerns on this invention. 本発明に係る遮熱用粘着テープの他の一例の構成を示す概略断面図である。It is a schematic sectional drawing which shows the structure of another example of the heat insulating adhesive tape which concerns on this invention. 本発明に係る遮熱用粘着テープの他の一例の構成を示す概略断面図である。It is a schematic sectional drawing which shows the structure of another example of the heat insulating adhesive tape which concerns on this invention.

以下、本発明を実施するための形態について図に基づいて説明する。
図1は、本発明に係る遮熱用粘着テープの代表的な一例の構成を示す概略断面図である。
基材11の一方の面に、粘着剤14中に潜熱蓄熱材(以下単に蓄熱材ともいう)13を分散させた層の上に粘着剤14のみからなる層を形成して、基材11の他方の面に金属層12を形成した遮熱用粘着テープである。実際の使用のときは、金属層12の側が熱源の存在する側であり、粘着剤14のみからなる粘着層が、熱を遮断して保護するべき部材に貼付される。
Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a schematic cross-sectional view showing a configuration of a typical example of a heat-shielding pressure-sensitive adhesive tape according to the present invention.
On one surface of the base material 11, a layer made of only the pressure sensitive adhesive 14 is formed on a layer in which a latent heat storage material (hereinafter also simply referred to as a heat storage material) 13 is dispersed in the pressure sensitive adhesive 14. The heat-shielding pressure-sensitive adhesive tape has a metal layer 12 formed on the other surface. In actual use, the side of the metal layer 12 is the side where the heat source is present, and an adhesive layer made of only the adhesive 14 is attached to a member to be protected by blocking heat.

本発明の遮熱用粘着テープを構成する部材について以下説明する。
〈蓄熱材〉蓄熱材は、ノルマルパラフィンやステアリン酸等の有機系蓄熱材と、酢酸ナトリウムや塩化カルシウム六水和物等の無機系蓄熱材に大別されて、いずれの材料を選定しても、相変化温度による所望の固定温度が得られるので、本発明ではどちらでも使用できる。結晶水を含む無機塩にすれば、遮熱用粘着テープに難燃性能を付与することが可能である。本発明では、結晶水を含む無機塩の蓄熱材をマイクロカプセル化することで、蓄熱材が融解しても粘着剤に影響を与えない構成とすることができるので好ましい。蓄熱材は、相変化温度での熱容量や添加量が多い程、固定温度が長時間安定に得られるが、過大の添加は粘着層内での粘着剤構造破壊を起こす可能性があるので適宜設計する必要がある。添加量とカプセル化については後述する。
The member which comprises the adhesive tape for heat insulation of this invention is demonstrated below.
<Heat storage material> Heat storage materials are roughly classified into organic heat storage materials such as normal paraffin and stearic acid, and inorganic heat storage materials such as sodium acetate and calcium chloride hexahydrate. Either can be used in the present invention because a desired fixed temperature can be obtained by the phase change temperature. If an inorganic salt containing crystal water is used, it is possible to impart flame retardancy to the heat shielding pressure-sensitive adhesive tape. In the present invention, it is preferable to microencapsulate an inorganic salt heat storage material containing crystal water, so that even if the heat storage material melts, the pressure-sensitive adhesive is not affected. As the heat storage material has a higher heat capacity at the phase change temperature and the amount added, the fixed temperature can be obtained stably for a long time, but excessive addition may cause the adhesive structure to break in the adhesive layer, so it is designed accordingly. There is a need to. The addition amount and encapsulation will be described later.

蓄熱材は、温度が変化する環境下で、一定温度を維持できる効果がある。例えば水を考えた場合、水の凝固点、氷の融点(固液相変化温度)は0℃であり、0℃以上から0℃以下への温度変化に対して、含まれる水が全て凝固して氷になるまで、温度は0℃に固定される。つまり、固有の相変化温度をもつ蓄熱材を系内に含めば、この相変化温度を跨いだ温度変化に対して、蓄熱材が全て凝固あるいは融解する時間、系の温度は一定に保たれる(蓄熱)。また、凝固、融解で出入りのある熱エネルギーの総量を潜熱といい、この潜熱が大きい程、系の温度を一定に保つ能力が大きい材料となる。 The heat storage material has an effect of maintaining a constant temperature in an environment where the temperature changes. For example, when water is considered, the freezing point of water, the melting point of ice (solid-liquid phase change temperature) is 0 ° C, and all the contained water is solidified in response to a temperature change from 0 ° C to 0 ° C. The temperature is fixed at 0 ° C until ice. In other words, if a heat storage material having a specific phase change temperature is included in the system, the temperature of the system is kept constant for the time during which the heat storage material is completely solidified or melted against the temperature change across the phase change temperature. (Heat storage). The total amount of heat energy that enters and exits during solidification and melting is called latent heat. The larger the latent heat, the higher the ability to keep the system temperature constant.

蓄熱材は、添加される粘着剤の特性と遮熱用粘着テープ用途に応じて選定すればよく、例えばn-テトラデカン(相変化温度5℃)、n-ペンタデカン(相変化温度9℃)、n-ヘキサデカン(相変化温度18℃)、n-ヘプタデカン(相変化温度22℃)、n-オクタデカン(相変化温度28℃)、n-ノナデカン(相変化温度32℃)、n-イコサン(相変化温度36℃)、セチルアルコール(相変化温度51℃)、ステアリン酸(相変化温度71℃)、水(相変化温度0℃)、酢酸ナトリウム三水塩(相変化温度58℃)、塩化カルシウム六水塩(相変化温度27℃)等があげられる。 The heat storage material may be selected according to the properties of the added pressure-sensitive adhesive and the heat-shielding pressure-sensitive adhesive tape. For example, n-tetradecane (phase change temperature 5 ° C), n-pentadecane (phase change temperature 9 ° C), n -Hexadecane (phase change temperature 18 ° C), n-heptadecane (phase change temperature 22 ° C), n-octadecane (phase change temperature 28 ° C), n-nonadecane (phase change temperature 32 ° C), n-icosane (phase change temperature) 36 ° C), cetyl alcohol (phase change temperature 51 ° C), stearic acid (phase change temperature 71 ° C), water (phase change temperature 0 ° C), sodium acetate trihydrate (phase change temperature 58 ° C), calcium chloride hexahydrate Salt (phase change temperature 27 ° C.) and the like.

蓄熱材は、溶解状態での粘度や粘着剤との相溶性等によっては、粘着層からブリードアウトする可能性があるので、蓄熱材そのままの状態で粘着層に混入するより、本発明のように、蓄熱材をマイクロカプセル化することが好ましい。 The heat storage material may bleed out from the adhesive layer depending on the viscosity in the dissolved state and the compatibility with the adhesive, so that the heat storage material is mixed into the adhesive layer as it is, as in the present invention. It is preferable to encapsulate the heat storage material.

マイクロカプセルのシェルの材料としては、その耐熱温度が上記潜熱型蓄熱剤の融点に比べて十分に高い(例えば100℃)の材質であって、遮熱用粘着テープの用途に応じた強度を有する材質を適宜選択すればよい。例えば、メラミン樹脂、アクリル樹脂、ウレタン樹脂等が挙げられる。好ましい材質は、ポリオキシメチレンウレアである。 The material of the shell of the microcapsule is a material whose heat-resistant temperature is sufficiently higher (for example, 100 ° C.) than the melting point of the latent heat storage agent, and has a strength corresponding to the use of the heat shielding adhesive tape. What is necessary is just to select a material suitably. For example, a melamine resin, an acrylic resin, a urethane resin, etc. are mentioned. A preferred material is polyoxymethylene urea.

マイクロカプセルの好ましい外径は1〜50μmであり、より好ましくは5〜20μmである。また、内包される蓄熱材の量は、潜熱効果の点からは多いほうが好ましいが、多過ぎると蓄熱材の体積変化によりマイクロカプセルが破損する恐れがある。このため、マイクロカプセル全体の重量に対する蓄熱材の量は、30〜90重量%とすることが好ましく、60〜80重量%とすることがより好ましい。 The preferred outer diameter of the microcapsule is 1 to 50 μm, more preferably 5 to 20 μm. Further, it is preferable that the amount of the heat storage material contained is larger from the viewpoint of the latent heat effect, but if it is too large, the microcapsule may be damaged due to a volume change of the heat storage material. For this reason, it is preferable that the quantity of the heat storage material with respect to the weight of the whole microcapsule shall be 30 to 90 weight%, and it is more preferable to set it as 60 to 80 weight%.

マイクロカプセルの製造方法としては、界面重合法、in−situ重合法、コアセルベート法等の従来の公知の製造方法から、蓄熱材及びシェルの材質等に応じて適切な方法を選択すればよい。 As a microcapsule manufacturing method, an appropriate method may be selected from conventionally known manufacturing methods such as an interfacial polymerization method, an in-situ polymerization method, a coacervate method, and the like according to the heat storage material and the shell material.

上記マイクロカプセルは、蓄熱性粘着剤の全体重量に対して25〜80重量%含有されることが好ましく、30〜75重量%であることがより好ましい。 It is preferable that the said microcapsule is contained 25 to 80 weight% with respect to the whole weight of a heat storage adhesive, and it is more preferable that it is 30 to 75 weight%.

蓄熱材あるいはマイクロカプセル(以下蓄熱材等という)の添加量は、多い程粘着テープの潜熱が大きくなり、相変化温度で一定に保つ能力が増すが、蓄熱材等は、非粘着性であるため、粘着層への均一分散では、添加量に伴って粘着テープの接着力は低下する。この添加された蓄熱材等が、粘着面側に存在しなければ、蓄熱材等が粘着剤を阻害することがなく、接着力の低下は改善する。本発明の思想の本質は、遮熱機能は蓄熱材等を含有する粘着層で保持して、接着力は粘着剤のみからなる粘着層で確保しようとするものである。 As the amount of heat storage material or microcapsule (hereinafter referred to as heat storage material) increases, the latent heat of the adhesive tape increases and the ability to keep the temperature constant at the phase change temperature increases. However, heat storage materials and the like are non-adhesive. In the uniform dispersion in the pressure-sensitive adhesive layer, the adhesive strength of the pressure-sensitive adhesive tape decreases with the addition amount. If the added heat storage material or the like is not present on the pressure-sensitive adhesive surface side, the heat storage material or the like does not hinder the pressure-sensitive adhesive, and the decrease in adhesive force is improved. The essence of the idea of the present invention is that the heat shielding function is held by an adhesive layer containing a heat storage material or the like, and the adhesive force is to be secured by an adhesive layer made of only an adhesive.

すなわち、図1に示すように、片面に金属層を形成した基材の反対面上に蓄熱材等を分散した粘着剤を塗布し、さらに、基材側でない側の上に蓄熱材を含まない粘着剤のみの層を形成して、粘着層が2層構造である遮熱用粘着テープとした。 That is, as shown in FIG. 1, a pressure-sensitive adhesive in which a heat storage material or the like is dispersed is applied on the opposite surface of the base material on which a metal layer is formed on one side, and the heat storage material is not included on the side that is not the base material side. A pressure-sensitive adhesive tape having a two-layer structure was formed by forming a pressure-sensitive adhesive layer alone.

図2は、本発明の他の一例の構成を示す概略断面図で、片面に金属箔を、蓄熱材等を分散した粘着剤によって貼合して金属層を形成し、基材の反対面上に粘着層を形成して、遮熱用粘着テープとしたものである。 FIG. 2 is a schematic cross-sectional view showing the configuration of another example of the present invention, in which a metal foil is bonded to one surface with an adhesive in which a heat storage material or the like is dispersed to form a metal layer, on the opposite surface of the substrate A pressure-sensitive adhesive layer is formed on the heat-shielding pressure-sensitive adhesive tape.

図3は、本発明のさらに、他の一例の構成を示す概略断面図で、基材の片面に金属箔を、蓄熱材等を分散した粘着剤によって貼合し、基材の反対面上に蓄熱材等を分散した粘着剤を塗布し、さらに、基材側でない側の上に蓄熱材を含まない粘着剤のみの層を形成して、粘着層が2層構造の遮熱用粘着テープとしたものである。 FIG. 3 is a schematic cross-sectional view showing the structure of yet another example of the present invention, in which a metal foil is bonded to one side of a base material with an adhesive in which a heat storage material or the like is dispersed, and on the opposite side of the base material Apply a pressure-sensitive adhesive in which a heat storage material, etc. is dispersed, and further form a layer of only the pressure-sensitive adhesive that does not contain a heat storage material on the side that is not the base material side. It is a thing.

〈金属層〉金属層は、遮熱効果の大きい金属を蒸着やスパッタリングで基材上に形成してもよいし、金属箔を接着剤で貼付してもよい。金属としては、遮熱効果が大きいアルミニウム、金、銀、またはステンレス鋼等を使用することができるが、コストの面から、金属箔にアルミニウムを使用して、接着剤で貼付する方法をとることが好ましい。 <Metal layer> The metal layer may be formed by depositing a metal having a large heat shielding effect on the substrate by vapor deposition or sputtering, or by attaching a metal foil with an adhesive. As the metal, aluminum, gold, silver, stainless steel or the like having a large heat shielding effect can be used, but from the viewpoint of cost, aluminum is used for the metal foil, and a method of sticking with an adhesive is taken. Is preferred.

〈基材〉本発明の基材は特に制限なく、従来粘着テープの基材に使用されるものが使用できる。耐熱性を有する合成樹脂性のフィルムであるポリエチレンテレフタレート(PET)やポリエチレンナフタレート(PEN)が好ましい。 <Substrate> The substrate of the present invention is not particularly limited, and those conventionally used for substrates of pressure-sensitive adhesive tapes can be used. Polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) which are heat-resistant synthetic resinous films are preferable.

〈粘着剤〉本発明の粘着層に用いられる粘着剤としては、特に制限はなく、従来公知の天然ゴムやSBR系、PIB系等のゴム系粘着剤や、エチレン−酢ビ(EVA)系粘着剤、(メタ)アクリル系粘着剤、シリコーン系粘着剤等を用いることができる。(メタ)アクリル系粘着剤が好ましい。(メタ)アクリル系とはアクリル系およびメタアクリル系の総称である。 <Adhesive> The adhesive used in the adhesive layer of the present invention is not particularly limited, and conventionally known natural rubber, rubber adhesives such as SBR and PIB, and ethylene-vinyl acetate (EVA) adhesives. An agent, a (meth) acrylic adhesive, a silicone adhesive, and the like can be used. A (meth) acrylic adhesive is preferred. (Meth) acrylic is a general term for acrylic and methacrylic.

基材への粘着層の形成方法は、従来公知の粘着剤の塗工方法が採用できる。
粘着層の2層構造の形成は、基材に接する層(下層)を塗工して乾燥させたのちに、その上に粘着剤を塗工する逐次重層塗布方法でもよいし、下層が乾燥するまえに、上の層を塗工する同時重層塗布方法でもよい。
As a method for forming the pressure-sensitive adhesive layer on the substrate, a conventionally known pressure-sensitive adhesive coating method can be employed.
The two-layer structure of the pressure-sensitive adhesive layer may be formed by a sequential multi-layer coating method in which a layer (lower layer) in contact with the substrate is applied and dried, and then a pressure-sensitive adhesive is applied thereon, or the lower layer is dried. A simultaneous multi-layer coating method in which the upper layer is coated may be used.

以下、本発明に係る粘着テープの実施例について詳細に説明する。また、実施例の比較対照となる比較例についても説明するが、その前に本発明の評価項目と評価方法を記載する。
接着力:SUS平滑面に貼合した10mm幅の粘着テープを、180度方向(折り返す方向)に引き剥がすために必要な剥離力(N/10mm幅)を測定して評価した。3.5N/10m幅以上であれば良好と判断できる。
遮熱力:銅線を挿入したコルゲートチューブに、作製した遮熱用粘着テープを巻き付け、150℃に加熱した金属板から50mmの位置に設置し、5時間後までのコルゲートチューブ表面温度を計測してその最高温度で遮熱力の尺度とした。温度が低いほど遮熱力が優れている。
Hereinafter, the Example of the adhesive tape which concerns on this invention is described in detail. Moreover, although the comparative example used as the comparison reference of an Example is also demonstrated, the evaluation item and evaluation method of this invention are described before that.
Adhesive strength: The peeling force (N / 10 mm width) required for peeling off the 10 mm-wide adhesive tape bonded to the SUS smooth surface in the 180-degree direction (turning direction) was evaluated. It can be determined that the width is 3.5 N / 10 m or more.
Heat shielding power: Wrap the prepared heat shielding adhesive tape around a corrugated tube with copper wire inserted, and place it at a position of 50mm from a metal plate heated to 150 ° C. Measure the corrugated tube surface temperature up to 5 hours later The maximum temperature was used as a measure of heat shielding power. The lower the temperature, the better the heat shielding power.

実施例1
基材である厚み125μmのPETフィルムの片面に、20μm厚のアルミニウム箔をアクリル系接着剤で貼付して金属層を形成した。次に、金属層の形成された面の反対側の面上に、蓄熱材として、ポリオキシメチレンウレアのシェルから成る、粒径が約20μmのマイクロカプセル化した酢酸ナトリウム三水塩(カプセル全量に対して80重量%含有)を、ブチルアクリレートとアクリル酸を9対1で配合したアクリル系粘着剤(以下アクリル系粘着剤という)に、全粘着剤量に対してカプセル含有量70重量%で分散した塗料を塗布、乾燥して100μmの粘着層を形成した。次に、この粘着層の上に蓄熱材を含まないアクリル系粘着剤塗料を、乾燥後の厚みが20μmになるようにダイコータを用いて塗布して、粘着層が2層構造の遮熱用粘着テープとした。
Example 1
On one side of a PET film having a thickness of 125 μm as a base material, an aluminum foil having a thickness of 20 μm was stuck with an acrylic adhesive to form a metal layer. Next, on the surface opposite to the surface on which the metal layer is formed, as a heat storage material, a microencapsulated sodium acetate trihydrate having a particle size of about 20 μm (consisting of the total amount of capsules) is made of a polyoxymethylene urea shell. Is dispersed in an acrylic adhesive (hereinafter referred to as acrylic adhesive) containing 9: 1 of butyl acrylate and acrylic acid at a capsule content of 70% by weight with respect to the total adhesive amount. The applied paint was applied and dried to form a 100 μm adhesive layer. Next, an acrylic pressure-sensitive adhesive paint not containing a heat storage material is applied onto the pressure-sensitive adhesive layer using a die coater so that the thickness after drying becomes 20 μm, and the pressure-sensitive adhesive layer has a two-layer structure. Tape.

実施例2
金属層の形成の接着剤を、蓄熱材として実施例1と同じマイクロカプセル化した酢酸ナトリウム三水塩を、アクリル系粘着剤に分散した厚み50μmの粘着剤に変更して、20μm厚のアルミニウム箔をPETの片面に貼合して金属層を形成した。金属層の形成された面の反対側の面上に、カプセルを含まない粘着剤塗液を塗布、乾燥して50μmの粘着層を形成して遮熱用粘着テープとした。
Example 2
The adhesive for forming the metal layer is changed to a 50 μm thick adhesive dispersed in acrylic adhesive with the same microencapsulated sodium acetate trihydrate as in Example 1 as a heat storage material, and a 20 μm thick aluminum foil Was bonded to one side of PET to form a metal layer. On the surface opposite to the surface on which the metal layer was formed, a pressure-sensitive adhesive coating liquid containing no capsules was applied and dried to form a 50 μm pressure-sensitive adhesive layer to obtain a heat-shielding pressure-sensitive adhesive tape.

実施例3
金属層の形成を実施例2と同様にした以外は、実施例1と同様にして遮熱用粘着テープを作製した。
Example 3
A heat shielding pressure-sensitive adhesive tape was prepared in the same manner as in Example 1 except that the formation of the metal layer was the same as in Example 2.

比較例1
粘着剤層を、厚さ50μmのアクリル系粘着剤単独での形成に変更した以外は実施例1と同様にして遮熱用粘着テープを作製した。
Comparative Example 1
A heat-shielding pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that the pressure-sensitive adhesive layer was changed to the formation of an acrylic pressure-sensitive adhesive having a thickness of 50 μm alone.

比較例2
粘着剤層を、厚さ120μmの潜熱材としてのカプセル含有のアクリル系粘着剤での形成に変更した以外は実施例1と同様にして遮熱用粘着テープを作製した。
Comparative Example 2
A heat-shielding pressure-sensitive adhesive tape was produced in the same manner as in Example 1 except that the pressure-sensitive adhesive layer was changed to a capsule-containing acrylic pressure-sensitive adhesive as a latent heat material having a thickness of 120 μm.

実施例および比較例で作製した各遮熱用粘着テープの接着力と遮熱力を評価した。結果を表1にまとめた。表1の結果より、本発明にかかる遮熱用粘着テープは、遮熱効果に優れ、かつ対象物への安定した接着性が得られることが確認できた。
表から、粘着層を重層構成にして、金属層と基材との間にも蓄熱材を含有する層を設けた実施例3の遮熱用粘着テープが、接着力も確保できてかつ遮熱力がもっとも優れていることがわかる。


表1

Figure 2012087182
The adhesive force and heat shielding power of each heat shielding pressure-sensitive adhesive tape prepared in Examples and Comparative Examples were evaluated. The results are summarized in Table 1. From the results in Table 1, it was confirmed that the heat-insulating pressure-sensitive adhesive tape according to the present invention was excellent in the heat-shielding effect and provided stable adhesion to the object.
From the table, the pressure-sensitive adhesive tape of Example 3 in which the pressure-sensitive adhesive layer has a multilayer structure and a layer containing a heat storage material is also provided between the metal layer and the base material can secure adhesive force and has a heat-shielding power. It turns out that it is the best.


Table 1
Figure 2012087182

11…PETフィルム(基材)
12…金属層
13…潜熱蓄熱材等
14…粘着剤、
11 ... PET film (base material)
12 ... Metal layer 13 ... Latent heat storage material etc. 14 ... Adhesive,

Claims (4)

基材の片面に金属層、反対面に粘着層が形成された粘着テープにおいて、粘着層が、潜熱蓄熱材を含む粘着剤層と、該粘着剤層の基材側でない側の上に少なくとも一層の潜熱蓄熱材を含まない粘着剤層とから構成されていることを特徴とする遮熱用粘着テープ。 In the pressure-sensitive adhesive tape in which the metal layer is formed on one side of the substrate and the pressure-sensitive adhesive layer is formed on the opposite side, the pressure-sensitive adhesive layer includes at least one layer on the pressure-sensitive adhesive layer containing the latent heat storage material and the side of the pressure-sensitive adhesive layer that is not the substrate side. A heat-shielding pressure-sensitive adhesive tape comprising a pressure-sensitive adhesive layer not containing any latent heat storage material. 基材と金属層との間に、少なくとも一層の潜熱蓄熱材を含む粘着剤層を形成することを特徴とする請求項1に記載の遮熱用粘着テープ。 The pressure-sensitive adhesive tape for heat insulation according to claim 1, wherein an adhesive layer containing at least one latent heat storage material is formed between the base material and the metal layer. 潜熱蓄熱材が、マイクロカプセルに封入され、粘着剤層中に分散していることを特徴とする請求項1乃至請求項2に記載の遮熱用粘着テープ。 The heat-shielding pressure-sensitive adhesive tape according to claim 1, wherein the latent heat storage material is enclosed in microcapsules and dispersed in the pressure-sensitive adhesive layer. 潜熱蓄熱材の相変化温度が、0℃以上100℃以下で固液相変化をすることを特徴とする請求項1乃至請求項3に記載の遮熱用粘着テープ。 4. The heat shielding pressure-sensitive adhesive tape according to claim 1, wherein the phase change temperature of the latent heat storage material undergoes a solid-liquid phase change at 0 ° C. or more and 100 ° C. or less.
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