JP6735432B1 - 熱伝導性シリコーンゴム組成物とそのシート及びその製造方法 - Google Patents
熱伝導性シリコーンゴム組成物とそのシート及びその製造方法 Download PDFInfo
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- JP6735432B1 JP6735432B1 JP2020513942A JP2020513942A JP6735432B1 JP 6735432 B1 JP6735432 B1 JP 6735432B1 JP 2020513942 A JP2020513942 A JP 2020513942A JP 2020513942 A JP2020513942 A JP 2020513942A JP 6735432 B1 JP6735432 B1 JP 6735432B1
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- heat conductive
- silicone
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- conductive silicone
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- GJBRNHKUVLOCEB-UHFFFAOYSA-N tert-butyl benzenecarboperoxoate Chemical compound CC(C)(C)OOC(=O)C1=CC=CC=C1 GJBRNHKUVLOCEB-UHFFFAOYSA-N 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
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Abstract
Description
本発明は前記従来の問題を解決するため、熱抵抗値が低い熱伝導性シリコーンゴム組成物とそのシート及びその製造方法を提供する。
前記ビニル基を持つシリコーンベースポリマー(A)は44〜71質量部、
前記ビニル基を持たないシリコーンオイル(B)は11〜45質量部、
前記両末端ビニル基を持つシリコーンオイル(C)は11〜45質量部であり、
前記熱伝導充填剤は、窒化アルミニウム粒子を含み、硬化成分として過酸化物を含むことを特徴とする。
(1)本発明品は溶剤に溶かした状態でコーティングするが、余った材料はコスト面から次回の生産に充てる。しかし、白金系触媒(付加反応系)では過酸化物硬化系よりもライフが短く硬化が進む為、次回の生産に充てることが困難である。
(2)白金系触媒(付加反応系)ではビニル基を持った箇所でしか反応しない。それでは硬化が不十分である。過酸化物硬化はビニル基とメチル基で反応することから、硬化が充分に進行する。
ビニル基を持たないオイルはジメチルシリコーンオイルと言われているものであれば基本的には何でも良く、その他にフェニルメチルシリコーンオイル、フロロシリコーンオイルなどがある。
次に、ガラスクロスに前記コーティング液を含浸させ、乾燥、加熱硬化してサイジングシートとする。このサイジングシートは、目止めガラスクロスシートとなる。
次に前記ガラスクロスのサイジングシートの少なくとも一面に前記コーティング液をコーティングし、乾燥後、加熱硬化して熱伝導性シリコーンシートを得る。コーティングはナイフコートが好ましい。ナイフコートは薄くコーティングできるからである。硬化条件としては、温度150〜180℃、硬化時間は3〜10分が好ましい。
<熱抵抗測定方法>
図2A−Bに示す装置を用いて測定した。
熱抵抗値は以下の式で算出した。
Rt=(Tc−Tf)/P0
但し、Rt:熱抵抗値(K・cm2/W)
Tc:トランジスタ温度(℃)
Tf:ヒートシンクの温度(℃)
P0:定電力(W)
測定装置は以下のとおりである。
トランジスタ:2SC2245(TO−3型)
ヒートシンク:40CH104L−90−K
(1)原料
(A)マトリックス成分
(A-1)ビニル基を持つシリコーンガム:エルケム・ジャパン社製、両末端且つ側鎖にビニル基を持つガム,80g
(A-2)両末端ビニルシリコーンオイル:エルケム・ジャパン社製、粘度350mm2/s (温度25℃)
(A-3)ビニル基を持たないシリコーンオイル:東レ・ダウコーニング社製、粘度300cs (温度25℃)
(B)熱伝導充填剤
(B-1)窒化アルミニウム(平均粒子径10μm):東洋アルミニウム社製
(B-2)アルミナ(平均粒子径12μm):日本軽金属社製
(B-3)アルミナ(平均粒子径2μm):昭和電工社製
(B-4)アルミナ(平均粒子径0.3μm):住友化学社製
(C)顔料
旭化成ワッカー社製、"ブラウン105A"
(D)過酸化物硬化成分
ビス−4−メチルベンゾイルパーオキサイド
以上の各原料を混錬機で均一に混錬し、熱伝導性シリコーン組成物とした。
(2)コーティング液1
前記原料組成物100gに、過酸化物硬化成分としてビス−4−メチルベンゾイルパーオキサイドの50%ペースト液を3gと希釈材として溶剤キシレンを適量加え、コーティング液1とした。
(3)コーティング液2
前記原料組成物100gに、過酸化物硬化成分としてビス−4−メチルベンゾイルパーオキサイドの50%ペースト液を0.8gと希釈材として溶剤キシレンを適量加え、コーティング液2とした。
(4)コーティング加工
まず、厚さ約35μmのガラスクロス(質量25g/m2,密度たて糸、よこ糸共に56本/25mm、平織組織の織物)にコーティング液1を含浸させ、乾燥、加熱硬化し、サイジングシートを作成した。
次に、サイジングシートの片面にコーティング液2をナイフコーターによりコーティングし、乾燥し、加熱器に入れ、180℃、3分間加熱硬化した。次いで、サイジングシートの他方の面にコーティング液2をナイフコーターによりコーティングし、乾燥した。その後、加熱器に入れ、180℃、3分間加熱硬化した。このようにして総厚0.2mmと0.33mmの熱伝導性シリコーンシートを製造した。
前記(A-3)のビニル基を持たないシリコーンオイルを加えない以外は実施例1と同様に実施した。各成分の添加量を表1に、熱抵抗値を表2にまとめて示す。
2 ガラスクロスのサイジングシート層
3,4 熱伝導性シリコーンコーティング層
10 熱抵抗測定装置
11 トランジスタ
12 ヒートシンク
13 押さえプレート
14 トランジスタの温度センサ
15 ヒートシンクの温度センサ
16 M3ねじ
Claims (10)
- シリコーンポリマーをマトリックス成分とし、熱伝導充填剤を含む熱伝導性シリコーン硬化物であって、
前記マトリックス成分は、ビニル基を持つシリコーンベースポリマー(A)と、ビニル基を持たないシリコーンオイル(B)と、両末端ビニル基を持つシリコーンオイル(C)からなり、
前記ビニル基を持つシリコーンベースポリマー(A)はシリコーンガムであり、
前記マトリックス成分を100質量部としたとき、
前記ビニル基を持つシリコーンベースポリマー(A)は44〜71質量部、
前記ビニル基を持たないシリコーンオイル(B)は11〜45質量部、
前記両末端ビニル基を持つシリコーンオイル(C)は11〜45質量部であり、
前記熱伝導充填剤は、窒化アルミニウム粒子を含み、
硬化成分として過酸化物を含むことを特徴とする熱伝導性シリコーン組成物。 - 前記マトリックス成分100質量部に対して、熱伝導充填剤は600〜2000質量部である請求項1に記載の熱伝導性シリコーン組成物。
- 前記熱伝導充填剤を100質量部としたとき、窒化アルミニウム粒子は10〜100質量部である請求項1又は2に記載の熱伝導性シリコーン組成物。
- 前記熱伝導充填剤は、さらにアルミナ粒子を含む請求項1〜3のいずれかに記載の熱伝導性シリコーン組成物。
- 前記熱伝導充填剤の平均粒子径は0.1〜20μmである請求項1〜4のいずれかに記載の熱伝導性シリコーン組成物。
- 前記熱伝導性シリコーン組成物には、補強性シリカは含まない請求項1〜5のいずれかに記載の熱伝導性シリコーン組成物。
- 請求項1〜6のいずれかに記載の熱伝導性シリコーン組成物をガラスクロスのサイジングシートの少なくとも一面にコーティングした熱伝導性シリコーンシートであって、
前記熱伝導性シリコーンシートの厚みは0.1〜1mmであることを特徴とする熱伝導性シリコーンシート。 - 前記ガラスクロスのサイジングシートの両面に熱伝導性シリコーン組成物がコーティングされている請求項7に記載の熱伝導性シリコーンシート。
- 請求項8に記載の熱伝導性シリコーンシートの製造方法であって、
請求項1〜6のいずれかに記載の熱伝導性シリコーン組成物に希釈液を加えてコーティング液とし、
ガラスクロスに、前記コーティング液を含浸させ、乾燥後、加熱硬化してサイジングシートとし、
前記ガラスクロスのサイジングシートの少なくとも一面に前記コーティング液をコーティングし、乾燥後、加熱硬化することを特徴とする熱伝導性シリコーンシートの製造方法。 - 前記コーティングはナイフコートである請求項9に記載の熱伝導性シリコーンシートの製造方法。
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