JP2018517008A - 放熱コーティング組成物およびこれを使用して形成された放熱ユニット - Google Patents
放熱コーティング組成物およびこれを使用して形成された放熱ユニット Download PDFInfo
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- JP2018517008A JP2018517008A JP2017552955A JP2017552955A JP2018517008A JP 2018517008 A JP2018517008 A JP 2018517008A JP 2017552955 A JP2017552955 A JP 2017552955A JP 2017552955 A JP2017552955 A JP 2017552955A JP 2018517008 A JP2018517008 A JP 2018517008A
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- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
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- QXJQHYBHAIHNGG-UHFFFAOYSA-N trimethylolethane Chemical compound OCC(C)(CO)CO QXJQHYBHAIHNGG-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
コーティング層形成成分は、主剤樹脂として、エポキシ当量が550g/eqであるビスフェノールA型エポキシ樹脂(KUKDO、YD−011)100重量部に対してポリアミド系の硬化剤(KUKDO、G−5022)を65重量部、平均粒径が150nmであり、D90が190nmであるカーボンブラックを22重量部、エポキシ系シラン化合物である物性増進成分(Shanghai Tech Polymer Technology,Tech−7130)3重量部、分散剤(イソブチルアルデヒドとウレアの縮合物)18重量部、溶媒としてメチルエチルケトン18重量部、トルエン28.8重量部、シクロヘキサノン285重量部を混合して撹はんした。撹はん後、混合物内に含まれた気泡を除去し、最終粘度を25℃基準100〜130cpsで製造し、下記表1のような放熱コーティング組成物を製造し、その後、5℃で貯蔵した。
実施例1と同一に実施して製造するものの、下記表1、表2または表3のように、カーボン系フィラーの種類、平均粒径、粒度分布およびコーティング層形成成分の種類などを変更し、表1、表 2または表3のような放熱コーティング組成物を製造した。
実施例1と同一に実施して製造するものの、下記の表4のようにカーボン系フィラーの含量、放熱フィラーの種類を変更し、下記表4のような放熱コーティング組成物を製造した。
実施例および比較例で製造された放熱コーティング組成物を図4のような両側端が上部方向に折り曲げられた形状のアルミニウム材質(Al1050)であり、厚さ1.5mm、横×縦×高さがそれぞれ35mm×34mm×12mmである重さ8.12gの基材の全面に最終厚さが25μmになるように、スプレインコーティングし、塗布後、150℃温度で10分間熱処理放熱コーティング層が形成された放熱ユニットを製造した後、下記の物性を評価し、表1〜表4に示した。
横、縦、高さがそれぞれ30cm×30cm×30cmであるアクリルチャンバーの中央に放熱ユニットを位置させた後、チャンバー内部の温度と放熱ユニットの温度を25±0.2℃になるように調節した。その後、放熱ユニットに熱源(セラミックヒータが結合された銅ブロック)をTIM(熱伝導性テープ:1W/mk)を使用して付着し、試験用試験片を製造した。製造された試験片の熱源に一定電流を印加して熱を発生させ、1時間維持した後、放熱ユニットの温度を測定し、熱放射率を評価した。具体的に、熱放射率は、放熱コーティング層が設けられていない基材に対して同一条件で測定した温度を基準として下記の数式によって計算した。
横、縦、高さがそれぞれ30cm×30cm×30cmであるアクリルチャンバーの中央に放熱ユニットを位置させた後、チャンバー内部の温度と放熱ユニットの温度を25±0.2℃になるように調節した。その後、放熱ユニットの下板の下部面の真ん中の地点に直径が15mm、厚さ1.5mm、温度が115℃である熱源を直接接触させた後、真ん中から対角線の延長線上にある放熱ユニットの終端の折曲地点4ヶ所地点の温度を続いて測定した。その後、前記4ヶ所地点の温度がそれぞれ10℃上昇するのに所要される時間を秒単位でそれぞれ測定した後、4ヶ所地点の所要時間に対する標準偏差を計算した。標準偏差が小さいほど放熱性能が均一であると認められ、放熱コーティング層のカーボン系フィラー分散性が高いと解釈できる。
温度が60℃、相対湿度が90%であるチャンバー内に放熱ユニットを配置した後、480時間経過後、放熱ユニットの表面状態を目視で評価した。評価結果、放熱コーティング層のクラック、剥離(浮き上がり)の有無を確認し、異常がない場合、○で示し、異常が発生した場合、×で示した。
耐久性を評価した試験片に対して1mm間隔になるように、ナイフでクロスカッティングを行った。その後、カッティングされた面にスコッチテープを付着し、60°角度に引っ張って、コーティング層が剥離される状態を確認する。評価基準は、ISO2409に基づいて評価した。(5B:0%、4B:5%以下、3B:5〜15%、2B:15〜35%、1B:35〜65%、0B:65%以上)
放熱ユニットの表面品質を確認するために、手で表面をタッチして、デコボコしたり、粗い感じがあるかを確認した。なめらかな感じがある場合、5で示し、粗い感じがある部分の面積が放熱ユニット外部面の全体面積のうち2%以下である場合、4で示し、2%超過5%以下の面積である場合、3で示し、5%超過10%以下の面積である場合、2、10%超過20%以下の面積である場合、1で示し、20%超過の面積である場合、0で示した。
実験例1で製造された放熱ユニットのうち実施例1の組成物を通じて製造された放熱ユニット(製造例4)と放熱コーティング層が処理されない図4のような放熱基材(比較製造例5)および図5のような構造のアルミニウム材質(Al6063)であり、厚さ2mm、横×縦×高さがそれぞれ35mm×34mm×12mmである重さ24.33gの放熱基材(比較製造例6)に対して下記の物性を評価し、下記表5に示した。
横、縦、高さがそれぞれ30cm×30cm×30cmであるアクリルチャンバーの中央に放熱ユニットを位置させた後、チャンバー内部の温度と放熱ユニットの温度を25±0.2℃になるように調節した。その後、放熱ユニットの下板の下部面の真ん中の地点に直径が15mm、厚さ1.5mmであるセラミック発熱体を直接接触させた後、620mA、5.2Vの電源を印加し、2時間経過した後の熱源の温度を測定した。
横、縦、高さがそれぞれ30cm×30cm×30cmであるアクリルチャンバーの中央に放熱ユニットを位置させた後、チャンバー内部の温度と放熱ユニットの温度を25±0.2℃になるように調節した。その後、放熱ユニットの下板の下部面の真ん中の地点に直径が15mm、厚さ1.5mmであるセラミック発熱体を直接接触させた後、620mA、5.2Vの電源を印加し、2時間経過した後、チャンバー内部の温度を測定した。
Claims (19)
- 主剤樹脂を含むコーティング層形成成分と、
前記主剤樹脂100重量部に対して8〜72重量部で含まれるカーボン系フィラーと、
放熱性および付着性向上のための物性増進成分と、を含む放熱コーティング組成物。 - 前記主剤樹脂は、グリシジルエーテル型エポキシ樹脂、グリシジルアミン型エポキシ樹脂、グリシジルエステル型エポキシ樹脂、線形脂肪族型(linear Aliphatic)エポキシ樹脂、ゴム変性エポキシ樹脂およびこれらの誘導体よりなる群から選択されるいずれか一つ以上のエポキシ樹脂を含む、請求項1に記載の放熱コーティング組成物。
- 前記カーボン系フィラーは、グラファイトおよびカーボンブラックのうちいずれか一つ以上を含む、請求項1に記載の放熱コーティング組成物。
- 前記コーティング層形成成分は、酸無水物系、アミン系、イミダゾール系、ポリアミド系およびポリメルカプタン系のうちいずれか一つ以上の成分を含む硬化剤をさらに含む、請求項1に記載の放熱コーティング組成物。
- 前記主剤樹脂は、ビスフェノールA型エポキシ樹脂を含むグリシジルエーテル型エポキシ樹脂である、請求項2に記載の放熱コーティング組成物。
- 前記ビスフェノールA型エポキシ樹脂は、エポキシ当量が350〜600g/eqである、請求項5に記載の放熱コーティング組成物。
- 前記コーティング層形成成分は、主剤樹脂としてビスフェノールA型エポキシ樹脂を含み、硬化剤としてポリアミド系成分をさらに含む、請求項1に記載の放熱コーティング組成物。
- 前記ポリアミド系成分は、アミン価が180〜300mgKOH/gのポリアミド系成分である、請求項7に記載の放熱コーティング組成物。
- 前記物性増進成分は、3−(N−アニル−N−グリシジル)アミノプロピルトリメトキシシラン、3−グリシドキシプロピルメチルエトキシシラン、γ−グリシドキシトリメチルジメトキシシラン、3−グリシドキシプロピルトリメトキシシラン、3−グリシドキシプロピルトリエトキシシラン、3−グリシドキシプロピルメチルメトキシシランおよび3−グリシドキシプロピルメチルジメトキシシランよりなる群から選択されるいずれか一つ以上を含む、請求項1に記載の放熱コーティング組成物。
- 前記カーボン系フィラーは、平均粒径が250nm以下のカーボンブラックである、請求項3に記載の放熱コーティング組成物。
- 前記ポリアミド系成分を含む硬化剤は、前記ビスフェノールA型エポキシ樹脂100重量部に対して45〜75重量部で含まれる、請求項7に記載の放熱コーティング組成物。
- 前記カーボン系フィラーは、前記主剤樹脂100重量部に対して17〜42重量部で含まれる、請求項1に記載の放熱コーティング組成物。
- 前記物性増進成分は、主剤樹脂100重量部に対して2〜5重量部で含まれる、請求項9に記載の放熱コーティング組成物。
- 前記放熱コーティング組成物は、粘度が10〜200cpsである、請求項1に記載の放熱コーティング組成物。
- 前記コーティング層形成成分は、ビスフェノールA型エポキシ樹脂を含む主剤樹脂と、ポリアミド系成分を含む硬化剤と、を具備し、前記カーボン系フィラーは、カーボンブラックを含む、請求項1に記載の放熱コーティング組成物。
- 前記カーボン系フィラーは、D90が260nm以下である、請求項10に記載の放熱コーティング組成物。
- 基材と、
請求項1〜16のいずれか一項に記載の放熱コーティング組成物が前記基材の外部面の少なくとも一部分に塗布されて硬化した放熱コーティング層とを含む放熱ユニット。 - 前記放熱コーティング層の厚さは、10〜100μmである、請求項17に記載の放熱ユニット。
- 前記放熱コーティング層は、放熱コーティング層の全体重量に対しカーボン系フィラーを5〜30重量%で含む、請求項17に記載の放熱ユニット。
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