JP2017078122A - 熱伝導性フィラーおよび透明熱伝導性樹脂組成物 - Google Patents
熱伝導性フィラーおよび透明熱伝導性樹脂組成物 Download PDFInfo
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Abstract
Description
すなわち、本発明は下記[1]〜[7]に記載の事項を特徴とするものである。
[1]熱伝導性フィラーであって、熱伝導性粒子の表面に屈折率制御層を設けたことを特徴とする熱伝導性フィラー。
[2]屈折率制御層が、SiおよびAlのうち少なくとも1種の元素を含むことを特徴とする前記[1]に記載の熱伝導性フィラー。
[3]屈折率制御層の厚みが、0.05〜1μmの範囲にあることを特徴とする前記[1]または[2]に記載の熱伝導性フィラー。
[4]熱伝導性粒子の粒径が平均粒径で0.5〜100μmの範囲にあることを特徴とする前記[1]〜[3]のいずれかに記載の熱伝導性フィラー。
[5]熱伝導性粒子の熱伝導率が3W/mK以上であることを特徴とする前記[1]〜[4]のいずれかに記載の熱伝導性フィラー。
[6]前記[1]〜[5]のいずれかに記載の熱伝導性フィラーを含有する樹脂組成物。
[7]前記熱伝導性フィラーの含有量が樹脂組成物の5〜95wt%の範囲にあることを特徴とする前記[6]に記載の樹脂組成物。
(1)熱伝導率
京都電子工業(株)QTM−500にて、うす膜測定用ソフトを用いて熱伝導率を測定した。
(2)全光線透過率
スガ試験機(株)のヘーズメータHZ−2を用いて測定した。
エタノール中で水酸化マグネシウム(平均粒径1μm 熱伝導率8W/mK 屈折率1.56)とテトラエトキシシランを触媒とともに混合した後、室温にて24時間攪拌し、白色のスラリーを得た。溶質をろ取した後、80℃で12時間真空乾燥した後、200℃で30時間真空乾燥し、水酸化マグネシウム(熱伝導性粒子)に酸化Si(屈折率制御層)をコーティングした粒子を得た。SEM観察の結果、屈折率制御層の厚みは0.4μmであった。EDSの結果、屈折率制御層を構成する金属成分Siと熱伝導性粒子を構成する金属成分Mgの原子数濃度比(Si/Mg比)は2.2であった。屈折率制御層の屈折率は1.45であった。
エタノール中で水酸化マグネシウム(平均粒径1μm 熱伝導率8W/mK 屈折率1.56)とテトラエトキシシランおよび塩化アルミニウムを触媒とともに混合した後、室温にて24時間攪拌し、白色のスラリーを得た。溶質をろ取した後、80℃で12時間真空乾燥した後、200℃で30時間真空乾燥し、水酸化マグネシウム(熱伝導性粒子)にSiとAlの複合酸化物(屈折率制御層)をコーティングした粒子を得た。SEM観察の結果、屈折率制御層の厚みは0.2μmであった。EDSの結果、屈折率制御層を構成する金属成分SiとAlの合計と熱伝導性粒子を構成する金属成分Mgの原子数濃度比((Si+Al)/Mg比)は1.3であった。SiとAlの原子数濃度比(Si/Al比)は3であった。屈折率制御層の屈折率は1.53であった。
シリコーン樹脂(2液混合タイプ 硬化後屈折率1.41)50重量部と実施例1で得られた粒子50重量部をダイナミックミキサーで混合した後、プレス成形機を用いて、120℃にてプレス成形を行い、引き続きオーブン中で150℃で4時間加熱し、外形100mmX50mmで厚み0.5mmのシート状の成形品を得た。該成形品を用いて熱伝導率と全光線透過率の測定を行った。結果を表1に示す。
実施例1で得られた粒子の代わりに、実施例2で得られた粒子を用いたこと以外は実施例3と同様の操作を行った。結果を表1に示す。
実施例1で得られた粒子の代わりに、屈折率制御層を設ける前の水酸化マグネシウムを用いたこと以外は実施例3と同様の操作を行った。結果を表1に示す。
[比較例2]
実施例1で得られた粒子を添加せずに実施例3と同様の操作を行った。結果を表1に示す。
Claims (7)
- 熱伝導性フィラーであって、熱伝導性粒子の表面に屈折率制御層を設けたことを特徴とする熱伝導性フィラー。
- 屈折率制御層が、SiおよびAlのうち少なくとも1種の元素を含むことを特徴とする請求項1に記載の熱伝導性フィラー。
- 屈折率制御層の厚みが、0.05〜1μmの範囲にあることを特徴とする請求項1または2に記載の熱伝導性フィラー。
- 熱伝導性粒子の粒径が平均粒径で0.5〜100μmの範囲にあることを特徴とする請求項1〜3のいずれかに記載の熱伝導性フィラー。
- 熱伝導性粒子の熱伝導率が3W/mK以上であることを特徴とする請求項1〜4のいずれかに記載の熱伝導性フィラー。
- 請求項1〜5のいずれかに記載の熱伝導性フィラーを含有する樹脂組成物。
- 前記熱伝導性フィラーの含有量が樹脂組成物の5〜95wt%の範囲にあることを特徴とする請求項6に記載の樹脂組成物。
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DE112018001964T5 (de) | 2017-04-11 | 2019-12-24 | Kyb Corporation | Magneterkennungsvorrichtung, Drehmomentsensor und elektrische Servolenkungsvorrichtung |
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US11104099B2 (en) | 2017-10-03 | 2021-08-31 | Shin-Etsu Chemical Co., Ltd. | Thermally conductive resin sheet having light transmission and method for producing the same |
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