JP7085843B2 - 熱伝導性成形体及びその製造方法 - Google Patents
熱伝導性成形体及びその製造方法 Download PDFInfo
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- JP7085843B2 JP7085843B2 JP2018000553A JP2018000553A JP7085843B2 JP 7085843 B2 JP7085843 B2 JP 7085843B2 JP 2018000553 A JP2018000553 A JP 2018000553A JP 2018000553 A JP2018000553 A JP 2018000553A JP 7085843 B2 JP7085843 B2 JP 7085843B2
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- Manufacture Of Macromolecular Shaped Articles (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
本実施形態に係る熱伝導性成形体は、三次元形状を有する第一の面を有する樹脂成形体と、三次元形状に追従するように樹脂成形体の第一の面上に配置された第一のフィルムと、を備える。
続いて上記熱伝導性成形体の製造方法について説明する。本実施形態に係る熱伝導性成形体の製造方法は、三次元形状を有する型の当該三次元形状に追従するように型上に配置され、三次元形状に対応した形状を有する第一のフィルムを準備する工程(第一工程)と、第一のフィルム上に、熱伝導性材料及び(メタ)アクリル単量体を含有する硬化性組成物を配置する工程(第二工程)と、硬化性組成物上に第二のフィルムを配置して、第一のフィルム及び第二のフィルムで硬化性組成物を挟む工程(第三工程)と、硬化性組成物中の(メタ)アクリル単量体をラジカル重合させて、第一のフィルム及び第二のフィルムの間に硬化性組成物の硬化物を形成する工程(第四工程)と、を備える。
第一工程は、三次元形状を有する型の当該三次元形状に追従するように型上に配置され、三次元形状に対応した形状を有する第一のフィルムを準備する工程である。型に対応した三次元形状を有する第一のフィルムを準備する方法としては、例えば、真空加熱圧着法、真空成型法、フィルムインサート成型法等が挙げられる。
第二工程は、第一のフィルム上に、熱伝導性材料及び(メタ)アクリル単量体を含有する硬化性組成物を配置する工程である。第二工程の一例を、図3を用いて以下で説明する。
第三工程は、硬化性組成物上に第二のフィルムを配置して、第一のフィルム及び第二のフィルムで硬化性組成物を挟む工程である。
第四工程は、硬化性組成物中の(メタ)アクリル単量体をラジカル重合させて、第一のフィルム10及び第二のフィルム13の間に硬化性組成物の硬化物(樹脂成形体)12aを形成する工程である。これにより、硬化性組成物の硬化物(樹脂成形体)12aを有する一体品50aが得られる。
表1に示す各成分を表1に記載の配合割合(質量比)でプラネタリーミキサーに仕込み、減圧下(0.01MPa)、30分混練することによって脱気及び混合して、硬化性組成物を得た。なお、下記硬化性組成物において、熱伝導性フィラーの体積割合は、67.4体積%であった。
・LA:ラウリルアクリレート
・ISTA:イソステアリルアクリレート
・HDDA:1,6-ヘキサンジオールジアクリレート
・IRGACURE819:BASF社製、ビス(2,4,6-トリメチルベンゾイル)-フェニルフォスフィンオキサイド
・T10:花王株式会社製、トリメリテート系可塑剤、トリメックス T-10
・IRGANOX1010:BASF社製、ペンタエリトリトールテトラキス(3-(3,5-ジ-tert-ブチル-4-ヒドロキシフェニル)プロピオネート)
・AO503:ADEKA社製「アデカスタブAO503」、ジトリデシルチオジプロピオネート
・B53:日本軽金属社製、水酸化アルミニウム(平均粒径50μm)
・BF083:日本軽金属社製、水酸化アルミニウム(平均粒径8μm)
・BYK-145:ビックケミー・ジャパン株式会社製、湿潤分散剤DISPERBYK-145
表2に示す各フィルムを準備し、図3(b)に示されるように、真空加熱圧着装置30として、両面真空成型機(布施真空株式会社製)を採用し、真空加熱圧着装置30内に設置した樹脂製の型20上にフィルムを固定した。該フィルムの表面温度が120℃になるように加熱条件を設定し、上述した図3(c)~図3(e)で示されるような手順に従って、加熱したフィルムをエアーが巻き込まれないように型20の表面に積層し、図3(f)に示されるような一体品40を作製した。フィルムの追従性については、目視にて確認した。ここで、型20は、図3(f)に示されるような、23.5mm×90.0mm×4.0mmの半円柱状の三次元形状が得られるような形状を備える。用いたフィルムの各性状を表2に示す。
フィルムA:シュペレン 35E-LL(株式会社宇部フィルム製、PE/EVOH/LLDPEの3層フィルムであり、各層は接着樹脂を介して積層しているフィルム)
フィルムB:シュペレン 35E-LL(株式会社宇部フィルム製、PE/EVOH/LLDPEの3層フィルムであり、各層は接着樹脂を介して積層しているフィルム)
フィルムC:ハイトロンBX(タマポリ株式会社製、ポリアクリロニトリルフィルム)
フィルムD:ダイアミロンC(三菱ケミカル株式会社製、塩化ビニリデンコート無延伸ナイロン-6フィルム)
フィルムE:ダイアミロンMF F001(三菱ケミカル株式会社製、PP/EVOH/PPの3層フィルムであり、各層は接着樹脂を介して積層しているフィルム)
フィルムF:ダイアミロンMF V442(三菱ケミカル株式会社製、EVOH/Nylon/PP/LLDPHの4層フィルムであり、一部の層は接着樹脂を介して積層しているフィルム)
フィルムG:UB-OB(タマポリ株式会社製、直鎖状低密度ポリエチレンフィルム)
フィルムH:V-1(タマポリ株式会社製、低密度ポリエチレンフィルム)
フィルムI:エンブレットS50(ユニチカ株式会社製、PETフィルム)
得られた熱伝導性成形体から第一のフィルムを剥離し、硬化性組成物の硬化状態を目視と指触で確認した。重合阻害が起こった場合は熱伝導性成形体の頂上部分及びフィルム表面には未硬化の硬化性組成物がうっすらと残って白濁していたが、重合阻害が起こらなかった場合にはフィルムは透明なままであった。また、重合阻害が起こらなかった場合の熱伝導性成形体の表面は、指触によりタックの存在を確認することができた。
Claims (9)
- 三次元形状を有する型の前記三次元形状に追従するように前記型上に配置され、前記三次元形状に対応した形状を有する第一のフィルムを準備する工程と、
前記第一のフィルム上に、熱伝導性材料及び(メタ)アクリル単量体を含有する硬化性組成物を配置する工程と、
前記硬化性組成物上に第二のフィルムを配置して、前記第一のフィルム及び前記第二のフィルムで前記硬化性組成物を挟む工程と、
前記硬化性組成物中の(メタ)アクリル単量体をラジカル重合させて、前記第一のフィルム及び前記第二のフィルムの間に前記硬化性組成物の硬化物を形成する工程と、
を備え、
前記第一のフィルム及び前記第二のフィルムの酸素透過度がいずれも1000ml/m2・24h・atm未満であり、且つ前記第一のフィルムの温度100℃における50%伸張強度が100N/25mm以下である、熱伝導性成形体の製造方法。 - 前記第一のフィルムの厚さが3~200μmである、請求項1に記載の熱伝導性成形体の製造方法。
- 前記第一のフィルムの動摩擦係数が0.7以下である、請求項1又は2に記載の熱伝導性成形体の製造方法。
- 三次元形状を有する第一の面を有し、熱伝導性フィラー及び(メタ)アクリル重合体を含有する樹脂成形体と、
前記三次元形状に追従するように前記樹脂成形体の前記第一の面上に配置された第一のフィルムと、
を備え、
前記第一のフィルムの酸素透過度が1000ml/m2・24h・atm未満であり、且つ温度100℃における50%伸張強度が100N/25mm以下である、熱伝導性成形体。 - 前記第一のフィルムの厚さが3~200μmである、請求項4に記載の熱伝導性成形体。
- 前記第一のフィルムの動摩擦係数が0.7以下である、請求項4又は5に記載の熱伝導性成形体。
- 前記樹脂成形体の前記第一の面とは反対側の面上に配置された第二のフィルムを更に備え、
前記第二のフィルムの酸素透過度が1000ml/m2・24h・atm未満である、請求項4~6のいずれか一項に記載の熱伝導性成形体。 - 前記第一の面が、型に対応した三次元形状を有する第一の面を有する、請求項4~7のいずれか一項に記載の熱伝導性成形体。
- 前記樹脂成形体における前記熱伝導性フィラーの含有量が、前記樹脂成形体全量基準で、55~95体積%である、請求項4~8のいずれか一項に記載の熱伝導性成形体。
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