JP6235997B2 - 水系冷却剤 - Google Patents
水系冷却剤 Download PDFInfo
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Description
一方、特に大きな金属部品や、焼入れ性の悪い金属部品の場合、油系の熱処理液では、冷却速度が遅く、冷却性能が不足するので、水系の熱処理液が用いられる。ところが、水系の熱処理液は、油系熱処理液よりも冷却性能が高いので、冷却むらが生じやすく焼割れのおそれがある。
そこで、焼割れを防止するため、水溶性ポリマーを水系熱処理液に添加した組成物が知られている。このような水系熱処理液組成物は、水溶性ポリマーが金属部品の表面に付着して、熱伝達を阻害し、冷却性能を抑制する。水溶性ポリマーを添加した水系熱処理液組成物は、工業的には普及しており、水溶性ポリマーとしてポリアルキレングリコール(PAG)が主流である。ただし、このような水系熱処理液組成物は、蒸気膜段階が長く、それ故に冷却むらが起き易いという欠点がある。
そこで、高分子量のポリアルキレングリコールに低分子量のグリコールを添加することで、蒸気膜段階を短くし、耐冷却むら性能を向上させた水系熱処理液組成物が提案されている(特許文献1参照)。また、水溶性のポリオキシアルキレン誘導体にカルボン酸またはスルホン酸のアルカリ金属塩を含有させた水系熱処理液も提案されている(特許文献2参照)。
一方、耐冷却むら性能を高くする技術として、古くから食塩水による焼入れが知られている。食塩水は、蒸気膜段階が無いので、高い冷却性能を有しながら耐冷却むら性能が高く焼割れが少ない(非特許文献1参照)。
(1)リン酸塩、亜リン酸塩、硫酸塩、亜硫酸塩、ホウ酸塩、モリブデン酸塩、タングステン酸塩、炭酸塩、炭酸水素塩、およびセスキ炭酸塩のいずれか1種以上の無機酸塩を配合してなることを特徴とする水系冷却剤。
(2)上述の水系冷却剤において、前記無機酸塩が無機酸の金属塩であることを特徴とする水系冷却剤。
(3)上述の水系冷却剤において、前記無機酸塩がナトリウム塩、カリウム塩、カルシウム塩、およびマグネシウム塩の少なくともいずれかであることを特徴とする水系冷却剤。
(4)上述の水系冷却剤において、前記無機酸塩の配合量が当該冷却剤全量基準で1質量%以上20質量%以下であることを特徴とする水系冷却剤。
(5)上述の水系冷却剤において、前記リン酸塩が、オルトリン酸塩、リン酸水素塩、リン酸二水素塩、ポリリン酸塩、およびメタリン酸塩の少なくともいずれかであることを特徴とする水系冷却剤。
(6)上述の水系冷却剤が焼入れ油または切削油であることを特徴とする水系冷却剤。
本冷却剤に用いられる無機酸塩としては、リン酸塩、亜リン酸塩、硫酸塩、亜硫酸塩、ホウ酸塩、モリブデン酸塩、タングステン酸塩、炭酸塩(炭酸カルシウムを除く)、炭酸水素塩、およびセスキ炭酸塩などが挙げられる。これらは単独で用いてもよいし、混合して用いてもよい。
また、本冷却剤におけるpHとしては、腐敗防止の観点より、7以上であることが好ましい。
水溶性防錆剤の配合量は、防錆性能の向上および経済性のバランスなどの面から、本冷却剤全量基準で好ましくは0.01質量%以上、5質量%以下、より好ましくは0.03質量%以上、1質量%以下である。このような水溶性防錆剤としては、オクタン酸塩等の脂肪族モノカルボン酸塩や、オクタン二酸(スベリン酸)塩、デカン二酸(セバシン酸)塩等の脂肪族ジカルボン酸塩が挙げられ、例えばセバシン酸カリウム等が好適に用いられる。なお、水溶性防錆剤としては、芳香族カルボン酸塩でもよい。また、水溶性防錆剤としては、モノヒドロキシモノエチルピペラジン等のピペラジン誘導体等も好適に用いることができる。
ここで、ベンゾトリアゾール系化合物とは、ベンゾトリアゾール自身やその誘導体を意味する。ベンゾイミダゾール系化合物、ベンゾチアゾール系化合物、およびベンゾチアジアゾール系化合物についても同様である。例えば、ベンゾトリアゾール系化合物としては、ベンゼン環にアルキル基が置換したアルキルベンゾトリアゾールや、さらにアミノ基水素がアルキル基で置換された(アルキル)アミノアルキルベンゾトリアゾールなどが挙げられる。このような金属腐食防止剤の配合量としては、本冷却剤全量基準で0.01質量%以上1質量%以下が好ましく、0.1質量%以上0.7質量%以下がより好ましい。金属腐食防止剤の配合量が0.01質量%未満では金属腐食防止効果が十分ではなくなるおそれがある。一方、金属腐食防止剤の配合量が1質量%を超えても金属腐食防止効果の向上はそれほど期待できない。
本冷却剤には、さらに、汎用される添加剤、例えば酸化防止剤、および清浄分散剤などが配合されていてもよい。
表1に示すように各種の添加剤(無機酸塩等)をイオン交換水に溶解して水系冷却剤を調製し、試料液とした。添加剤の濃度は、特に記載のないかぎりいずれも試料液基準で10質量%とした。実施例12、13は、表1に記載した量だけ炭酸水素ナトリウムを追加した。
各試料液を50℃に保ち、JIS K2242B法に準拠して冷却試験を行い、特性秒数を測定した。具体的には、冷却曲線において蒸気膜段階が終了する温度(特性温度)に到達するまでの時間(秒数)を測定した。結果を表1に示す。なお、併せて、各種水溶液のpHも表1に記載した。
1)添加剤濃度は5質量%とした。
2)添加剤なし。
3)炭素数9のカルボン酸のアミン塩(炭素数8のアルキル基を有するカルボン酸とトリエタノールアミンとの塩)を30質量%添加した。
表1の結果より、本発明の水系冷却剤は所定の無機酸塩の水溶液であるため、いずれも特性秒数が非常に短く、極めて冷却性能が高いことがわかる。しかも、ハロゲンのような腐食性因子を有さないので金属材料に対して腐食を生じるおそれがない。それ故、金属材料の焼入れや切削に極めて有効であることが理解できる。
一般に、水は液温が30℃以上になると、急激に冷却性が低下し、焼きが入らなくなる。本発明の水系冷却剤は、50℃の液温でも優れた冷却性能を発揮しており、特筆すべきである。
これに対して、本発明所定の無機酸塩を全く添加していない比較例1のイオン交換水では、冷却性能が十分に出ない。また、無機酸の塩でも本発明の無機酸塩とは異なる塩や、有機酸の塩を添加しても冷却性能を上げることはできない。また、比較例7、8の添加剤は、ハロゲンを有するため、冷却性能は高いが腐食性に問題がある。
Claims (6)
- 水系冷却剤であって、
リン酸塩、亜リン酸塩、硫酸塩、亜硫酸塩、ホウ酸塩、モリブデン酸塩、タングステン酸塩、炭酸カリウム又は炭酸マグネシウムである炭酸塩、炭酸水素塩、並びに、セスキ炭酸塩のいずれか1種以上の無機酸塩を前記冷却剤全量基準で10質量%以上配合してなり、
前記リン酸塩が、リン酸水素塩、リン酸二水素塩、ポリリン酸塩、およびメタリン酸塩の少なくともいずれかであり、
前記水系冷却剤が金属材料の焼入れまたは切削に用いられるものである
ことを特徴とする水系冷却剤。 - 請求項1に記載の水系冷却剤において、
前記無機酸塩が無機酸の金属塩である
ことを特徴とする水系冷却剤。 - 請求項2に記載の水系冷却剤において、
前記無機酸塩がナトリウム塩、カリウム塩、カルシウム塩、およびマグネシウム塩の少なくともいずれかである
ことを特徴とする水系冷却剤。 - 請求項1から請求項3までのいずれか1項に記載の水系冷却剤において、
前記無機酸塩の配合量が当該冷却剤全量基準で10質量%以上20質量%以下である
ことを特徴とする水系冷却剤。 - 請求項1から請求項4までのいずれか1項に記載の水系冷却剤において、
さらに水溶性防錆剤を、当該冷却剤全量基準で0.01質量%以上5質量%以下配合してなる
ことを特徴とする水系冷却剤。 - 請求項1から請求項5までのいずれか1項に記載の水系冷却剤において、
さらに金属腐食防止剤を、当該冷却剤全量基準で0.01質量%以上1質量%以下配合してなる
ことを特徴とする水系冷却剤。
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CN108884504B (zh) | 2016-03-31 | 2021-01-26 | 出光兴产株式会社 | 水溶性淬火油组合物 |
CN106755816A (zh) * | 2016-12-29 | 2017-05-31 | 铜陵市金利电子有限公司 | 一种用于大型金属部件淬火的冷却剂 |
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