JP5309989B2 - 熱伝導性樹脂材料およびその成形体 - Google Patents
熱伝導性樹脂材料およびその成形体 Download PDFInfo
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- JP5309989B2 JP5309989B2 JP2008509889A JP2008509889A JP5309989B2 JP 5309989 B2 JP5309989 B2 JP 5309989B2 JP 2008509889 A JP2008509889 A JP 2008509889A JP 2008509889 A JP2008509889 A JP 2008509889A JP 5309989 B2 JP5309989 B2 JP 5309989B2
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Description
2 粒子状に分散した有機化合物(B)
3 母材の熱可塑性樹脂(A)
δ:溶解度パラメーター(SP値)
Ecohi:各原子団のモル凝集エネルギー
EVmi:各原子団のモル体積
上記有機化合物(B)としては、エステル化合物、オレフィン化合物、カーボネート化合物、およびアミド化合物から選ばれる1種または2種以上を含み、融点が80℃〜200℃であり、分子量が2000以下の低分子化合物であることが好ましい。このような種類の有機化合物は、ポリエステル樹脂などの母材樹脂に対して、加水分解やエステル交換反応などによる分子量低下の問題を生じ難く、溶融粘度も低いため、母材樹脂に容易に微分散するという利点がある。
[熱伝導性樹脂成形体の調製]
市販のポリ乳酸(ユニチカ製、融点170℃、δ=21〜22[J/cm3]1/2)に対し、繊維状フィラー(C)として表1に示すカーボンファイバーと、有機化合物(B)として表2に示す化合物とを、表3〜6に示す配合量(表中の数値は質量%を表す。)でアルミニウムトレーに分取し、190〜200℃で約1分間かけてハンドミキシングにより混合した。
得られた平板サンプルについて、熱伝導性を、以下に示す2つの方法を用いて評価した。電子機器筐体等での実際の使用環境を考慮して、熱伝導率と熱容量のバランスに基づく成形体表面の温度拡散の変化について評価した。
平板サンプルを支持台に固定し、予め80℃に加熱したラバーヒーターで平板サンプルの一部に定常熱を負荷した。ラバーヒーターとの接触部分からサンプル全体に熱が拡散していく様子を赤外線サーモトレーサー(NEC三栄製、サーモスキャナTS5304)で測定し、図3に示すサーモグラフィー解析により、面内熱伝導性を評価した。既知の放射率を有する黒体塗料をサンプル表面に塗装して測定に供した。サンプルの熱伝導性a(図3(a))と、同じ繊維状フィラーのみを添加したときの熱伝導性b(図3(b))との比、a/bを基準に判断した。評価基準は、以下の通りとした。結果を表3〜6に示す。
○:同じ繊維状フィラーのみを添加した場合に比べて熱伝導性が1.5倍以上1.5倍未満
△:同じ繊維状フィラーのみを添加した場合に比べて熱伝導性が0.9倍以上1.1未満
×:同じ繊維状フィラーのみを添加した場合に比べて熱伝導性が0.9倍未満。
アルミニウム台の上に平板サンプルを置き、その上から予め80℃に加熱した分銅を置いて、定量熱を負荷した。分銅の設置から一定時間内に広がる熱の様子を、上記同様、サーモトレーサーにより測定した。
△:同形状のステンレス板に比べ、1分後の熱の広がり(面積)が1.1倍以上1.5倍未満
×:同形状のステンレス板に比べ、1分後の熱の広がり(面積)が1.1倍未満
Claims (28)
- 母材の熱可塑性樹脂(A)と、繊維状フィラー(C)とを含む樹脂材料であって、樹脂成分中にこれに非相溶な有機化合物(B)が分散粒子として存在し、2つ以上の繊維状フィラー(C)が有機化合物(B)の各分散粒子の表面に接触し、または各分散粒子中に存在し、熱可塑性樹脂(A)がポリ乳酸、ポリ乳酸誘導体およびポリ乳酸アロイの1種または2種以上を含み、有機化合物(B)がエステル化合物、オレフィン化合物、カーボネート化合物およびアミド化合物から選ばれる1種または2種以上を含み、繊維状フィラー(C)が、カーボンファイバーを含むことを特徴とする樹脂材料。
- 繊維状フィラー(C)が、有機化合物(B)の各分散粒子に網目状に接触していることを特徴とする請求項1に記載の樹脂材料。
- 繊維状フィラー(C)が、有機化合物(B)の平均粒子径の2倍以上の平均繊維長を有することを特徴とする請求項1または2記載の樹脂材料。
- 繊維状フィラー(C)が、0.2mm以上50mm以下の平均繊維長を有することを特徴とする請求項1から3のいずれかに記載の樹脂材料。
- 繊維状フィラー(C)が、1μmより大きく100μm以下の平均直径を有することを特徴とする請求項1から4のいずれかに記載の樹脂材料。
- 繊維状フィラー(C)が、500以上50000以下のアスペクト比を有することを特徴とする請求項1から5のいずれかに記載の樹脂材料。
- 繊維状フィラー(C)が、総質量に対して1〜40質量%含有されることを特徴とする請求項1から6のいずれかに記載の樹脂材料。
- 繊維状フィラー(C)が、カーボン、窒化物、炭化物、ホウ化物および金属から選ばれる1種または2種以上を含む50W/m・K以上の熱伝導率を有する無機材料を含むことを特徴とする請求項1から7のいずれかに記載の樹脂材料。
- カーボンファイバーが結晶性を有することを特徴とする請求項1から8のいずれかに記載の樹脂材料。
- 繊維状フィラー(C)が、酸素含有基、窒素含有基および硫黄含有基から選ばれる1種または2種以上の極性基を有し、または、該極性基若しくは繊維状フィラー(C)が、金属、金属化合物および有機化合物から選ばれる1種または2種以上を結合若しくは付着してなることを特徴とする請求項1から9のいずれかに記載の樹脂材料。
- 繊維状フィラー(C)が、0.2mm未満の平均繊維長を有する繊維状フィラー(D)を含むことを特徴とする請求項1から10のいずれかに記載の樹脂材料。
- 繊維状フィラー(D)が、5nm以上50μm以下の平均繊維長を有するカーボンファイバーまたはその集合体であることを特徴とする請求項11に記載の樹脂材料。
- 繊維状フィラー(D)が、総質量に対して0.5〜20質量%含有されることを特徴とする請求項11または12に記載の樹脂材料。
- 有機化合物(B)が、0.1〜500μmの範囲の平均粒子径を有することを特徴とする請求項1から13のいずれかに記載の樹脂材料。
- 有機化合物(B)が、分子量が2000以下の低分子化合物であることを特徴とする請求項1から14のいずれかに記載の樹脂材料。
- 有機化合物(B)が、80〜200℃の融点を有することを特徴とする請求項1から15のいずれかに記載の樹脂材料。
- 有機化合物(B)が、植物性油脂、動物性油脂、およびこれらから合成されるワックス状物質から選ばれる1種または2種以上を含むことを特徴とする請求項1から16のいずれかに記載の樹脂材料。
- 有機化合物(B)が、主鎖の炭素数が8〜44であり、分子量が300〜1000であり、極性基を有していてもよい脂肪族カルボン酸アミド、芳香族カルボン酸アミド、脂肪族カルボン酸エステルおよび芳香族カルボン酸エステルから選ばれる1種または2種以上を含むことを特徴とする請求項1から17のいずれかに記載の樹脂材料。
- 極性基が、酸素含有基および窒素含有基から選ばれる1種または2種以上を含むことを特徴とする請求項18記載の樹脂材料。
- 有機化合物(B)が、ひまし油から誘導されたカルボン酸アミド化合物を含むことを特徴とする請求項18または19に記載の樹脂材料。
- 有機化合物(B)が、リシノール酸アミド、ステアリン酸アミド、オレイン酸アミド、パルミチン酸アミド、リノール酸アミド、リノレン酸アミド、アラキン酸アミド、または、これらの誘導体を含むことを特徴とする請求項20記載の樹脂材料。
- 有機化合物(B)が、総質量に対して0.5〜20重量%含有されることを特徴とする請求項1から20のいずれかに記載の樹脂材料。
- 熱可塑性樹脂(A)が、ポリスチレン系樹脂を含むことを特徴とする請求項1から22のいずれかに記載の樹脂材料。
- 熱可塑性樹脂(A)が、ポリカプロラクトン、ポリブチレンサクシネート、ポリヒドロキシアルカノエート、酢酸セルロース、澱粉樹脂、これらの誘導体、および、これらの石油系ポリエステル樹脂とのアロイから選ばれる1種または2種以上を含むことを特徴とする請求項1から23のいずれかに記載の樹脂材料。
- 請求項1から24のいずれか1項に記載の樹脂材料を用いて成形したことを特徴とする樹脂成形体。
- 繊維状フィラー(C)は、成形体の厚さに対して0.5倍以上100倍以下の平均繊維長を有することを特徴とする請求項25記載の樹脂成形体。
- 射出成形により成形されたことを特徴とする請求項25または26記載の樹脂成形体。
- 圧縮成形により成形されたことを特徴とする請求項25または26記載の樹脂成形体。
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Also Published As
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CN101415779A (zh) | 2009-04-22 |
JPWO2007116973A1 (ja) | 2009-08-20 |
WO2007116973A1 (ja) | 2007-10-18 |
US20090286075A1 (en) | 2009-11-19 |
CN101415779B (zh) | 2012-04-25 |
EP2006334A1 (en) | 2008-12-24 |
EP2006334A4 (en) | 2010-09-22 |
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