JP6710828B2 - 熱伝導シート、および、熱伝導シートの製造方法 - Google Patents
熱伝導シート、および、熱伝導シートの製造方法 Download PDFInfo
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- JP6710828B2 JP6710828B2 JP2016076405A JP2016076405A JP6710828B2 JP 6710828 B2 JP6710828 B2 JP 6710828B2 JP 2016076405 A JP2016076405 A JP 2016076405A JP 2016076405 A JP2016076405 A JP 2016076405A JP 6710828 B2 JP6710828 B2 JP 6710828B2
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Description
以下、実施例により本発明をさらに詳細に説明する。なお、本発明は、これらの実施例に限られるものでない。
(実施例1)
第1補強層12、低硬度層11、第2補強層13の各組成物材料を表1ないし表3に示す配合割合で混合し、3種類の混合物を作製した(混合工程)。これらの混合物のうち低硬度層11の組成物材料の混合物は、第1補強層12および第2補強層13の組成物材料の混合物と比較して、粘度が高かった。
低硬度層11および第2補強層13の各組成物材料を表2および表3に示す配合割合で混合し、実施例1と同様のコーターにて2層用のダイヘッドを使用してそれぞれの材料を一対のロール(高分子フィルム)間に同時に一気に押し出して積層し、オーブンにて105℃で加熱重合を行って、2層構造の熱伝導シート40を作製した。完成した熱伝導シート40は、低硬度層11の厚みが1.7mm、第2補強層13の厚みが0.3mmになるように製造条件を整えた。低硬度層11のアスカーC硬度は0、第2補強層13のアスカーC硬度は42であった。
比較例1として、低硬度層、第1補強層、第2補強層の各組成物材料を表1ないし表3に示す配合割合で混合し、実施例1と同様のコーターにて単層用のダイヘッドを使用してそれぞれの層を別個に成形、硬化させ、完成した単層の各シートを接着剤を介して積層させた熱伝導シートを用意した。完成した熱伝導シートは、低硬度層の厚みが1.4mm、第1補強層および第2補強層の厚みが0.3mmになるようにした。低硬度層のアスカーC硬度は0、第1補強層のアスカーC硬度は38、第2補強層13のアスカーC硬度は42であった。
上記実施例1,2および比較例1の各熱伝導シートに対し、10mm×10mmの試験片を切り出し、測定装置(製品名「テンシロン万能試験機RTC−1210A」、エー・アンド・デイ株式会社製)を用いて、使用ロードセル500kgf/cm2、クロスヘッドスピード1.0mm/minの条件で圧縮力を測定した。測定結果を表4および図6に示す。
上記実施例1および比較例1の各熱伝導シートに対し、25mm×25mmの試験片を切り出し、ASTM D5470に準拠しつつ、熱抵抗測定器を用いて熱抵抗を測定した。測定結果を表5に示す。
上記実施例1の熱伝導シート10に対し、25mm×25mmの試験片を切り出して薬包紙に載置し、室温約20℃の温度条件下で約300時間放置するオイルブリード評価を行った。また、同様のオイルブリード評価を、市販品のシリコン系熱伝導シートについても行った。
実施例1の熱伝導シート10の両面に積層されている高分子フィルム34を剥したところ、第2補強層13に積層されている高分子フィルム34の方が第1補強層12に積層されている高分子フィルム34よりも剥し易いことが確認できた。これは、第2補強層13に含まれている水酸化マグネシウム17による効果と考えられる。
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。
11:低硬度層
12:第1補強層
13:第2補強層
14:アクリルポリマー
15:炭化ケイ素
16:水酸化アルミニウム
17:水酸化マグネシウム
18:第1接合境界部
19:第2接合境界部
30:コーター
32:ダイヘッド
32A:吐出口
33:ロール
34:高分子フィルム
35:オーブン
Claims (5)
- 低硬度層と、前記低硬度層の片面又は両面に積層され前記低硬度層より硬度が高い補強層と備える熱伝導シートであって、
前記低硬度層は、アクリルポリマー18〜25質量%と、平均粒径60μm〜100μmの炭化ケイ素30〜35質量%と、平均粒径10μm〜50μmの水酸化アルミニウム15〜23質量%と、平均粒径1μm〜2μmの水酸化マグネシウム18〜30質量%と、可塑剤1〜5質量%とを含有し、
前記補強層は、アクリルポリマー20〜30質量%と、平均粒径10〜50μmの水酸化アルミニウム60〜80質量%とを含有し、
前記低硬度層と前記補強層とが互いに接合した境界部分からなり、前記低硬度層と前記補強層とが互いに入り込み混合した状態で重合あるいは架橋しつつ硬化した接合境界部を備える熱伝導シート。 - 前記炭化ケイ素の一部が、前記補強層に入り込む形で前記接合境界部に配されている請求項1に記載の熱伝導シート。
- 前記低硬度層の両面に一対の前記補強層が積層されるとともに、前記一対の補強層のうち一方側に、平均粒径1〜2μmの水酸化マグネシウム15〜20質量%が含まれている、請求項1または請求項2に記載の熱伝導シート。
- 請求項1ないし請求項3のいずれか一項に記載の熱伝導シートの製造方法であって、
(メタ)アクリル酸エステルを含むモノマーを重合してなるポリマーと、(メタ)アクリル酸エステルと、を含むアクリル系樹脂、多官能モノマー、熱重合開始剤、可塑剤、炭化ケイ素、水酸化アルミニウム及び水酸化マグネシウムを含有する前記低硬度層の組成物材料と、
(メタ)アクリル酸エステルを含むモノマーを重合してなるポリマーと、(メタ)アクリル酸エステルと、を含むアクリル系樹脂、多官能モノマー、熱重合開始剤及び水酸化アルミニウム含む前記補強層の組成物材料と、をそれぞれ別個に混合する混合工程と、
前記混合工程により混合された各混合物を、複数の吐出口を有するダイヘッドを介して、互いに向かい合う一対の高分子フィルムの間に向けて同時に押し出す形で積層する押出工程と、
前記押出工程により押し出された積層物を加熱して硬化させる硬化工程と、を実行する、熱伝導シートの製造方法。 - 前記押出工程において、前記低硬度層の前記組成物材料の混合物は、前記補強層の前記組成物材料の混合物よりも粘度が高い請求項4に記載の熱伝導シートの製造方法。
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