JP2022093259A - やに入りはんだ用フラックス、やに入りはんだ及びはんだ付け方法 - Google Patents
やに入りはんだ用フラックス、やに入りはんだ及びはんだ付け方法 Download PDFInfo
- Publication number
- JP2022093259A JP2022093259A JP2021154190A JP2021154190A JP2022093259A JP 2022093259 A JP2022093259 A JP 2022093259A JP 2021154190 A JP2021154190 A JP 2021154190A JP 2021154190 A JP2021154190 A JP 2021154190A JP 2022093259 A JP2022093259 A JP 2022093259A
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- JP
- Japan
- Prior art keywords
- flux
- rosin
- acid
- mass
- solder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Abstract
Description
本実施の形態のやに入りはんだ用フラックスは、ロジンエステルと、ハライドとして区分されないハロゲン化物である共有結合ハロゲン化物を含む。
本実施の形態のやに入りはんだは、上述したやに入りはんだ用フラックスが充填された線状のはんだである。やに入りはんだ用フラックスは、はんだを加工する工程で流れ出さないように常温(例えば25℃)で固形であること、あるいは流れ出さないような所定の高粘度であることが求められる。なお、やに入りはんだ用フラックスに求められる粘度は、例えば3500Pa・s以上であることが好ましい。やに入りはんだ用フラックスが25℃において低粘度液体(粘度が3500Pa・s未満)であると、やに入りはんだの加工性が低下するため好ましくない。なお、後述するはんだごての中心軸に沿って形成された貫通孔に供給可能な形状であれば、やに入りはんだの形状は、断面が円形で連続した形態の線状に限定されず、四角形等の角を有した形状や、星型等の任意の断面形状で連続した形態の線状、円柱状や角柱状等の任意の断面形状で非連続な形態のペレット状、連続した形態または非連続な形態のシート状、球状等、適宜変更可能である。
図1は、本実施の形態のはんだ付け方法で使用されるはんだごての一例を示す説明図、図2A、図2B、図2C及び図2Dは、本実施の形態のはんだ付け方法を示す説明図である。
やに入りはんだ用フラックスが、本発明で規定された所定量のロジンエステルを含むことで、上述したはんだ付け方法において、はんだごての貫通孔内のフラックス残渣による堆積物を液状化させることができ、堆積物の外部への排出を促進して、堆積物がはんだごての貫通孔の内部へ固着することを抑制できる。
(1)検証方法
ピン部品を挿入した厚さ1.6mmのスルーホール基板を用意し、アポロ精工製J-CAT300SLVを用いて、はんだごての設定温度400℃、はんだ付け時間1.0sで40ポイントのはんだ付けを実施した。スルーホール濡れ上がり性試験におけるはんだ付けは、上述したように、はんだごての中心軸に沿って形成された貫通孔にやに入りはんだを供給して行われる。試験後の基板をキーエンス製デジタルマイクロスコープ VHX-6000で観察し、下記条件で判定した。
◎:スルーホール内にはんだが充填されているポイントの割合が100%
〇:スルーホール内にはんだが充填されているポイントの割合が95%以上100%未満
×:スルーホール内にはんだが充填されているポイントの割合が95%未満
(a)絶縁信頼性
(1)検証方法
JIS Z 3197に則り、やに入りはんだをくし形基板にはんだ付けし、85℃85%RHの高温高湿条件下に設置して、エスペック製イオンマイグレーション評価システムAMI-150-U-5を用いて100Vの電圧を印加することで電気絶縁性を測定した。JIS Z 3283よりJIS A級は168時間経過時点の絶縁抵抗値が1×108Ω以上と規定されているため、下記条件で判定した。
◎:168時間での絶縁抵抗値が1×108Ω以上
×:168時間での絶縁抵抗値が1×108Ω未満
(1)検証方法
JIS Z 3197に則り、京都電子工業製電位差自動滴定装置AT-610を用いてやに入りはんだ用フラックスの2-プロパノール溶液を硝酸銀水溶液で滴定し、電位差の変位点からハライド含有量を求めた。JIS Z 3283よりJIS A級はハライド含有量が0.5%以下と規定されている為、下記条件で判定した。
◎:ハライド含有量が0.5%以下
×:ハライド含有量が0.5%超
(1)検証方法
ピン部品を挿入せずに裏面にテープを貼付した厚さ1.6mmのスルーホール基板を用意し、はんだごての設定温度400℃、はんだ付け時間1.0sで15000ショットのはんだ付けを実施した。はんだ付け性におけるはんだ付けは、上述したように、はんだごての中心軸に沿って形成された貫通孔にやに入りはんだを供給して行われる。15000ショット終了時にはんだごての貫通孔の内径をデジタルマイクロスコープで観察した後に、再度上記スルーホール濡れ上がり性試験を実施し、下記条件で判定した。
◎:堆積物を含むはんだごての貫通孔の内径が、堆積物を含まない貫通孔内径に対して60%以上、且つスルーホール濡れ上がり性試験で◎判定
〇:堆積物を含むはんだごての貫通孔の内径が、堆積物を含まない貫通孔内径に対して60%以上、且つスルーホール濡れ上がり性試験で〇判定
×:堆積物を含むはんだごての貫通孔の内径が、堆積物を含まない貫通孔内径に対して60%未満、又はスルーホール濡れ上がり性試験で×判定
(1)検証方法
作製した実施例、比較例のやに入りはんだ用フラックスを容器に移して冷却させ、固化させた際の外観を目視で観察した。活性剤の析出が発生するとはんだ付け時の外観が悪くなる上、フラックス成分の偏りによる性能安定性への影響や信頼性への懸念も増加することから避ける必要があり、下記条件で判定した。
◎:固化したフラックス中に活性剤の析出が確認されない
×:固化したフラックス中に活性剤の析出が確認される
Claims (7)
- はんだごての中心軸に沿って形成された貫通孔に供給されるやに入りはんだに使用されるやに入りはんだ用フラックスあって、
ロジンエステルを、フラックス全体の質量に対して60質量%以上99.9質量%以下、
共有結合ハロゲン化物を、フラックス全体の質量に対して0.1質量%以上15質量%以下含む
やに入りはんだ用フラックス。 - 前記共有結合ハロゲン化物は、trans-2,3-ジブロモ-1,4-ブテンジオール、トリアリルイソシアヌレート6臭化物、1-ブロモ-2-ブタノール、1-ブロモ-2-プロパノール、3-ブロモ-1-プロパノール、3-ブロモ-1,2-プロパンジオール、1,4-ジブロモ-2-ブタノール、1,3-ジブロモ-2-プロパノール、2,3-ジブロモ-1-プロパノール、2,3-ジブロモ-1,4-ブタンジオール、2,3-ジブロモ-2-ブテン-1,4-ジオール、trans-2,3-ジブロモ-2-ブテン-1,4-ジオール、cis-2,3-ジブロモ-2-ブテン-1,4-ジオール、2,2-ビス(ブロモメチル)-1,3-プロパンジオール、テトラブロモエタン、テトラブロモブタン、テトラブロモフタル酸、ブロモコハク酸、2,2,2-トリブロモエタノールの何れか1種または2種以上である
請求項1に記載のやに入りはんだ用フラックス。 - 前記ロジンエステルは、1種のロジンをエステル化したものの1種以上、あるいは、2種以上のロジン混合物をエステル化したものの1種以上であり、エステル化するロジンは、天然ロジン、並びに天然ロジンから得られるロジン誘導体である精製ロジン、重合ロジン、水添ロジン、不均化ロジン、水添不均化ロジン、酸変性ロジン、フェノール変性ロジン及びα、β不飽和カルボン酸変性物、並びに重合ロジンの精製物、水素化物及び不均化物、並びにα、β不飽和カルボン酸変性物の精製物、水素化物及び不均化物のいずれか、あるいは、その混合物である
請求項1または請求項2に記載のやに入りはんだ用フラックス。 - 更に他のロジンを、フラックス全体の質量に対して0質量%以上39質量以下含む
請求項1~請求項3の何れか1項に記載のやに入りはんだ用フラックス。 - 更に共有結合ハロゲン化物以外の活性剤を、フラックス全体の質量に対して0質量%以上39質量%以下含む
請求項1~請求項4の何れか1項に記載のやに入りはんだ用フラックス。 - 請求項1~請求項5の何れか1項に記載のやに入りはんだ用フラックスがはんだに充填された
やに入りはんだ。 - ロジンエステルを、フラックス全体の質量に対して60質量%以上99.9質量%以下、共有結合ハロゲン化物を、フラックス全体の質量に対して0.1質量%以上15質量%以下含むやに入りはんだ用フラックスが充填されたはんだからなるやに入りはんだが、はんだごての中心軸に沿って形成された貫通孔に供給され、
前記はんだの融点を超える温度まで、前記やに入りはんだを前記はんだごてで加熱して、接合対象物を加熱すると共に前記やに入りはんだを溶融させる
はんだ付け方法。
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