JP6721849B1 - ソルダペースト - Google Patents
ソルダペースト Download PDFInfo
- Publication number
- JP6721849B1 JP6721849B1 JP2019098303A JP2019098303A JP6721849B1 JP 6721849 B1 JP6721849 B1 JP 6721849B1 JP 2019098303 A JP2019098303 A JP 2019098303A JP 2019098303 A JP2019098303 A JP 2019098303A JP 6721849 B1 JP6721849 B1 JP 6721849B1
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- Japan
- Prior art keywords
- present
- acrylic resin
- rosin
- range specified
- amount
- Prior art date
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- 239000004925 Acrylic resin Substances 0.000 claims abstract description 377
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- 229910045601 alloy Inorganic materials 0.000 claims abstract description 75
- 239000000956 alloy Substances 0.000 claims abstract description 75
- 239000002904 solvent Substances 0.000 claims abstract description 70
- 239000000203 mixture Substances 0.000 claims abstract description 47
- 239000000843 powder Substances 0.000 claims abstract description 25
- 229910052751 metal Inorganic materials 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 15
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- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 claims description 336
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 336
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- 238000005476 soldering Methods 0.000 description 9
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- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 8
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Abstract
Description
フラックスは、アクリル樹脂と、有機酸と、溶剤を含み、
アクリル樹脂を5.0wt%以上50.0wt%以下含み、
金属粉は、
As:25〜300質量ppm、並びにSb:0質量ppm超3000質量ppm以下、Bi:0質量ppm超10000質量ppm以下、及びPb:0質量ppm超5100質量ppm以下の少なくとも1種、並びに残部がSnからなる合金組成を有し、下記数(1b)式及び数(2)式を満たす。
275≦2As+Sb+Bi+Pb≦5300・・・(1b)
0.01≦(2As+Sb)/(Bi+Pb)≦10.00・・・(2)
上記数(1b)式及び数(2)式中、As、Sb、Bi、およびPbは各々前記合金組成での含有量(質量ppm)を表す。
0.31≦(2As+Sb)/(Bi+Pb)≦10.00・・・(2a)
上記数(2a)式中、As、Sb、Bi、及びPbは各々前記合金組成での含有量(質量ppm)を表す。
本実施の形態のフラックスは、アクリル樹脂と、有機酸と、溶剤を含む。本実施の形態のフラックスはアクリル樹脂を5.0wt%以上50.0wt%以下含む。アクリル樹脂は、はんだ付けで想定される温度域での耐熱性を有し、加熱後に硬化したフラックス残渣中に残存することで、フラックス残渣が軟残渣となる。これにより、温度の変化があってもフラックス残渣が割れることが抑制され、温度サイクル信頼性が向上する。アクリル樹脂の含有量が5.0wt%未満であると、温度サイクル信頼性が低下する。
本実施の形態のソルダペーストは、上述したフラックスと、金属粉を含む。金属粉は、Sn単体のはんだの粉体、または、Sn−Ag系、Sn−Cu系、Sn−Ag−Cu系、Sn−Bi系、Sn-In系等、あるいは、これらの合金にSb、Bi、In、Cu、Zn、As、Ag、Cd、Fe、Ni、Co、Au、Ge、P、Pb等を添加したはんだ合金の粉体で構成される。
上記の数(1)式中、As、Sb、Bi、及びPbは各々合金組成での含有量(質量ppm)を表す。
275≦2As+Sb+Bi+Pb≦5300・・・(1b)
上記の数(1a)及び数(1b)式中、As、Sb、Bi、及びPbは各々合金組成での含有量(質量ppm)を表す。
上記の数(2)式中、As、Sb、Bi、及びPbは各々合金組成での含有量(質量ppm)を表す。
上記の数(2a)式中、As、Sb、Bi及びPbは各々合金組成での含有量(質量ppm)を表す。
アクリル樹脂は、はんだ付けで想定される温度域での耐熱性を有し、加熱後に硬化したフラックス残渣中に残存することで、フラックス残渣が軟残渣となる。これにより、アクリル樹脂を含むフラックス、及び、このフラックスを用いたソルダペーストでは、温度の変化があってもフラックス残渣が割れることが抑制され、温度サイクル信頼性が向上する。
(1)検証方法
温度サイクル信頼性の評価は、実施例、比較例のフラックスをCu板上に塗布し、Cu板上に残渣を形成した。このCu板上に形成された残渣を、−30℃と+110℃でそれぞれ30分ずつ保持する処理を繰り返す試験を500サイクル行った際の残渣の割れの有無を目視で評価した。
〇:残渣に亀裂の発生が見られなかった
×:残渣に亀裂の発生が見られた
〇:温度サイクル信頼性の評価が〇であった
×:温度サイクル信頼性の評価が×であった
上述した実施例1のフラックスと、以下の表5〜表10に示す組成のはんだ合金を使用して調合したソルダペーストの増粘抑制効果についても検証した。表1に示す実施例1のフラックスと、表5〜表10に示す合金組成からなりJIS Z 3284−1:2014における粉末サイズの分類において記号4を満たすサイズ(粒度分布)のはんだ粉末とを混合してソルダペーストを作製した。フラックスとはんだ粉末との質量比は、フラックス:はんだ粉末=11:89である。
得られたソルダペーストについて、JIS Z 3284−3:2014の「4.2 粘度特性試験」に記載された方法に従って、回転粘度計(PCU−205、株式会社マルコム製)を用い、回転数:10rpm、測定温度:25℃にて、粘度を12時間測定し続けた。そして、初期粘度(撹拌30分後の粘度)と12時間後の粘度とを比較し、以下の基準に基づいて増粘抑制効果の評価を行った。
(2)判定基準
〇:13時間後の粘度≦初期粘度×1.2:経時での粘度上昇が小さく良好
×:13時間後の粘度>初期粘度×1.2:経時での粘度上昇が大きく不良
Claims (9)
- フラックスと、金属粉からなるソルダペーストにおいて、
前記フラックスは、アクリル樹脂と、有機酸と、溶剤を含み、
アクリル樹脂を5.0wt%以上50.0wt%以下含み、
金属粉は、
As:25〜300質量ppm、並びにSb:0質量ppm超3000質量ppm以下、Bi:0質量ppm超10000質量ppm以下、及びPb:0質量ppm超5100質量ppm以下の少なくとも1種、並びに残部がSnからなる合金組成を有し、下記数(1b)式及び数(2)式を満たすソルダペースト。
275≦2As+Sb+Bi+Pb≦5300・・・(1b)
0.01≦(2As+Sb)/(Bi+Pb)≦10.00・・・(2)
上記数(1b)式及び数(2)式中、As、Sb、Bi、およびPbは各々前記合金組成での含有量(質量ppm)を表す。 - 前記フラックスは、前記有機酸を0.2wt%以上13.0wt%以下、チキソ剤を0wt%以上10.0wt%以下含む
請求項1に記載のソルダペースト。 - 前記チキソ剤としてアミド系チキソ剤を0wt%以上10.0wt%以下、エステル化合物を0wt%以上8.0wt%以下含み、アミド系チキソ剤とエステル化合物の合計が10.0wt%以下である
請求項2に記載のソルダペースト。 - 更に、前記合金組成は下記数(2a)式を満たす、請求項1〜請求項3のいずれか1項に記載のソルダペースト。
0.31≦(2As+Sb)/(Bi+Pb)≦10.00・・・(2a)
上記数(2a)式中、As、Sb、Bi、及びPbは各々前記合金組成での含有量(質量ppm)を表す。 - 更に、前記合金組成は、Ag:0〜4質量%及びCu:0〜0.9質量%の少なくとも1種を含有する、請求項1〜請求項4のいずれか1項に記載のソルダペースト。
- 前記フラックスは、さらにロジンを0wt%以上45.0wt%以下含む
請求項1〜5の何れか1項に記載のソルダペースト。 - 前記ロジンの含有量が0wt%超である場合、1種の前記ロジンまたは2種以上の前記ロジンと、1種の前記アクリル樹脂または2種以上の前記アクリル樹脂の合計の含有量が35.0wt%以上60.0wt%以下であり、1種の前記ロジンまたは2種以上の前記ロジンの合計の含有量と、1種の前記アクリル樹脂または2種以上の前記アクリル樹脂の合計の含有量との比率が0.1以上9.0以下である
請求項6に記載のソルダペースト。 - さらに、前記アクリル樹脂と前記ロジン以外の他の樹脂を0wt%以上10.0wt%以下、
アミンを0wt%以上20.0wt%以下、
アミンハロゲン化水素酸塩を0wt%以上2.0wt%以下、
有機ハロゲン化合物を0wt%以上5.0wt%以下、
酸化防止剤を0wt%以上5.0wt%以下含む
請求項6または請求項7に記載のソルダペースト。 - 前記アクリル樹脂とロジン以外の他の樹脂を0wt%以上10.0wt%以下、
アミンを0wt%以上20.0wt%以下、
アミンハロゲン化水素酸塩を0wt%以上2.0wt%以下、
有機ハロゲン化合物を0wt%以上5.0wt%以下、
酸化防止剤を0wt%以上5.0wt%以下含む
請求項1〜請求項5の何れか1項に記載のソルダペースト。
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JP6359499B2 (ja) * | 2015-09-28 | 2018-07-18 | 株式会社タムラ製作所 | 耐冷熱衝撃フラックス組成物、ソルダペースト組成物および電子回路基板 |
JP6296663B2 (ja) * | 2015-12-04 | 2018-03-20 | 株式会社タムラ製作所 | フラックス組成物、ソルダペースト組成物および電子回路基板 |
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