JP7414853B2 - 熱伝導-電気絶縁性塗料組成物及びこれを含む太陽電池用外装材鋼板 - Google Patents
熱伝導-電気絶縁性塗料組成物及びこれを含む太陽電池用外装材鋼板 Download PDFInfo
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- JP7414853B2 JP7414853B2 JP2021574819A JP2021574819A JP7414853B2 JP 7414853 B2 JP7414853 B2 JP 7414853B2 JP 2021574819 A JP2021574819 A JP 2021574819A JP 2021574819 A JP2021574819 A JP 2021574819A JP 7414853 B2 JP7414853 B2 JP 7414853B2
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- 229910000831 Steel Inorganic materials 0.000 title claims description 56
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- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 5
- 229910052582 BN Inorganic materials 0.000 claims description 4
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 229920006122 polyamide resin Polymers 0.000 claims description 3
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- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 6
- 229910001335 Galvanized steel Inorganic materials 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
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- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
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- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
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Description
本発明の他の側面において、本発明は、一面に放熱層が形成された鋼板;及び上記鋼板の他面に熱可塑性樹脂、熱伝導性フィラー及び高分子分散剤を含む熱伝導-電気絶縁性コーティング層が形成され、上記熱伝導性フィラーは、高分子分散剤で囲まれた形態でコーティング層に分散された太陽電池用外装材鋼板を提供するものである。
上記太陽電池は、ステンレス基板で製造されたCIGS薄膜太陽電池、熱伝導-電気絶縁性コーティング層、鋼板及び放熱性コーティング層で形成されてよく、上記太陽電池に熱伝導-電気絶縁性コーティング層が接着される形態で太陽電池が製造されてよいが、上記太陽電池はこれに限定されない。
(1)熱伝導-電気絶縁性塗料組成物の製造
シクロヘキサン66gに高分子分散剤としてSolsperse 5000S 0.02gを投入して攪拌した後、平均粒子サイズが3~5μmのカーボンブラック1gを添加して攪拌し、カーボンブラックの表面が高分子分散剤で囲まれた状態を製造する。その後、ここにポリアミド樹脂99gを添加した後、均一に攪拌し、接着性のある熱伝導-電気絶縁性塗料組成物を得た。
ヒドロキシ基を含むオリゴマー(JONCRYL(登録商標)611、BASF社)80gとアミノ硬化剤(Luwipal 066、BASF社)20g及びシクロヘキサン25gが混合された混合物に平均粒子が8~10μmであり、アスペクト比が4.5であるグラファイトフィルター1gを添加した後、均一に攪拌する。その後、酸触媒(Nacure 2547、King Industries社)1gを添加した後、攪拌して放熱性塗料組成物を得た。
Mgを含む亜鉛めっき鋼板の一面に上記のように製造された熱伝導-電気絶縁性塗料組成物をロールコーターでコーティングし、他面には放熱性塗料組成物をコーティングした後、鋼板の温度が200~250℃になるように加熱して太陽電池用外装材鋼板を製造した。
このとき、上記熱伝導-電気絶縁性塗料組成物で形成されたコーティング層の厚さは7~8μm、放熱性塗料組成物で形成されたコーティング層の厚さは25~28μmになるようにコーティングした。
(3)で製造された太陽電池用外装材鋼板のうち、熱伝導-電気絶縁性塗料組成物がコーティングされた面がCIGS薄膜太陽電池のステンレス基板側を相対するように密着させ、放熱性塗料組成物でコーティングされた面が大気に曝されるように上記太陽電池用外装材鋼板をCIGS薄膜太陽電池に取り付けた。
その後、上記太陽電池用外装材鋼板が太陽電池に接着されるように誘導加熱(induction heating)してコーティング鋼板の温度を100~150℃で加熱すると同時に一定の圧力を加えた。
上記実施例1において、熱伝導-電気絶縁性塗料組成物の製造時に熱可塑性樹脂としてポリウレタン、熱伝導性フィラーとして窒化ホウ素を使用し、放熱性コーティング組成物の製造時にヒドロキシオリゴマーの代わりにカルボキシオリゴマーを使用した点を除いては、実施例1と同様に太陽電池を製造した。
上記実施例1において、下記表1に記載のように、熱可塑性樹脂、熱伝導性フィラー及び高分子分散剤を変更した熱伝導-電気絶縁性塗料組成物及びオリゴマー、アミノ硬化剤及び異方性フィラーを変更した放熱性塗料組成物を使用し、上記熱伝導-電気絶縁性塗料組成物及び放熱性塗料組成物がコーティングされる鋼板としてAl-Mg-Znが含まれた三元系めっき鋼板を使用することを除いては、実施例1と同様に太陽電池を製造した。
1)熱伝導度の測定
実施例1及び2、比較例1及び2で製造された太陽電池の熱伝導度をレーザーフラッシュ(laser flash)法(NETZSCH社のLFA457)で測定した。
実施例1及び2、比較例1及び2で製造された太陽電池の放熱性を評価するために上記太陽電池を温度25℃の恒温器に装入し、1,000Wの赤外線電球を使用して太陽電池に熱エネルギーを加えて、放熱性塗料組成物がコーティングされた一面の温度をリアルタイムで測定した。
温度変化のない平衡に達する温度を採用し、その温度が低いほど上記太陽電池の放熱性に優れていると判断した。
製造された太陽電池において、放熱性塗料組成物で形成されたコーティング層の表面粗度及び表面積を三次元粗度計(Vecco社、モデル名:Wyko NT 9380)を使用して測定した。
上記1)、2)、3)の結果を下記表2にまとめた。
2:CIGS太陽電池が含まれた太陽電池層
3:ステンレス基板
4:熱伝導-電気絶縁性コーティング層
5:めっき鋼板
6:放熱層
Claims (10)
- 一面に放熱層が形成された鋼板;及び
前記鋼板の他面に熱可塑性樹脂、熱伝導性フィラー及び高分子分散剤を含む熱伝導-電気絶縁性コーティング層を含み、
前記熱伝導性フィラーは高分子分散剤で囲まれた形態でコーティング層に分散され、
前記高分子分散剤は、Solsperse 5000S(登録商標)、Solsperse 12000(登録商標)及びSolsperse 22000(登録商標)からなる群から選択される少なくとも1つであり、
前記放熱層は、鋼板の厚さ方向に外部に向かって突出したしわを有し、前記突出したしわ内に異方性フィラーを含み、前記異方性フィラーは、鋼板の厚さ方向に外部に向かって配向されている、太陽電池用外装材鋼板。 - 前記熱可塑性樹脂は、Vicat軟化点試験(ASTM D1525)で測定した軟化点が100~150℃である、請求項1に記載の太陽電池用外装材鋼板。
- 前記熱可塑性樹脂は、ポリウレタン、ポリアミド及びアクリル樹脂からなる群から選択される少なくとも1つである、請求項1に記載の太陽電池用外装材鋼板。
- 前記熱伝導性フィラーは、カーボンブラック、窒化ホウ素及びグラファイトからなる群から選択される少なくとも1つである、請求項1に記載の太陽電池用外装材鋼板。
- 前記熱可塑性樹脂及び前記熱伝導性フィラーの重量比は99:1~95:5である、請求項1に記載の太陽電池用外装材鋼板。
- 前記高分子分散剤は、前記熱伝導性フィラー100重量部当たり1~3重量部である、請求項1に記載の太陽電池用外装材鋼板。
- 前記熱伝導-電気絶縁性コーティング層は厚さが5~10μmである、請求項1に記載の太陽電池用外装材鋼板。
- 前記放熱層は、ヒドロキシル基またはカルボキシル基を有するオリゴマー及びアミノ硬化剤を含む第2混合物、酸触媒及び前記異方性フィラーを含むものである、請求項1に記載の太陽電池用外装材鋼板。
- 前記異方性フィラーは、前記しわの突出方向に追従して配向されているものである、請求項1に記載の太陽電池用外装材鋼板。
- 前記放熱層は厚さが10~30μmである、請求項1に記載の太陽電池用外装材鋼板。
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