JP6353403B2 - 金属加工用潤滑油組成物 - Google Patents
金属加工用潤滑油組成物 Download PDFInfo
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- JP6353403B2 JP6353403B2 JP2015099875A JP2015099875A JP6353403B2 JP 6353403 B2 JP6353403 B2 JP 6353403B2 JP 2015099875 A JP2015099875 A JP 2015099875A JP 2015099875 A JP2015099875 A JP 2015099875A JP 6353403 B2 JP6353403 B2 JP 6353403B2
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- lubricating oil
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- metal working
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- 239000010687 lubricating oil Substances 0.000 title claims description 33
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- 239000002184 metal Substances 0.000 claims description 19
- 125000000217 alkyl group Chemical group 0.000 claims description 16
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- 125000004432 carbon atom Chemical group C* 0.000 claims description 8
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- 238000006467 substitution reaction Methods 0.000 claims description 3
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- FMNZBNCPTJEVDS-KVVVOXFISA-N 2-ethyl-2-(hydroxymethyl)propane-1,3-diol;(z)-octadec-9-enoic acid Chemical compound CCC(CO)(CO)CO.CCCCCCCC\C=C/CCCCCCCC(O)=O FMNZBNCPTJEVDS-KVVVOXFISA-N 0.000 description 1
- LLEFDCACDRGBKD-UHFFFAOYSA-N 2-ethyl-2-(hydroxymethyl)propane-1,3-diol;nonanoic acid Chemical compound CCC(CO)(CO)CO.CCCCCCCCC(O)=O LLEFDCACDRGBKD-UHFFFAOYSA-N 0.000 description 1
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- 239000003549 soybean oil Substances 0.000 description 1
- 235000012424 soybean oil Nutrition 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229960002317 succinimide Drugs 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
- 239000003760 tallow Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- VLLMWSRANPNYQX-UHFFFAOYSA-N thiadiazole Chemical compound C1=CSN=N1.C1=CSN=N1 VLLMWSRANPNYQX-UHFFFAOYSA-N 0.000 description 1
- 238000005292 vacuum distillation Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Landscapes
- Lubricants (AREA)
Description
しかし、近年では塩素系極圧剤を配合した潤滑油は、焼却処理時のダイオキシンの発生や焼却炉の腐食、損傷等の問題が指摘されており、また一部の有機塩素化合物は、発がん性を有することが報告されている。したがって、塩素を含有しない金属加工油の開発が求められている。塩素を含有しない金属加工油としては、ポリサルファイド、硫化油脂、カルシウムスルホネート、ZnDTP等の硫黄基材や、リン酸エステル等のリン系基材を使用したものが従来から知られている(下記特許文献1〜5参照)。これらのなかでも特に活性ポリサルファイドとスルホネート併用したものが優れることが従来知られている。
しかしながら、これらの潤滑油組成物では加工性能が充分ではなく、近年の材料の硬度化、高塑性化、また加工効率の高効率化等により、切削加工では工具寿命や加工精度の低下、塑性加工では材料破断や工具破損等の問題が発生している。
R1−Sm−R2 (1)
(式中、R1およびR2は、それぞれ個別に炭素数4〜16の直鎖または分枝のアルキル基を示す。mは平均硫黄架橋数を表し、2.5以上の数を示す。)
R1−Sm−R2 (1)
[A]成分の含有量が1質量%未満の場合、充分な効果を得ることができず、20質量%を超えると潤滑油組成物の酸化安定性が低下する傾向にあるため、それぞれ好ましくない。
金属比が1未満の金属サリシレート系清浄剤では、併用時に切削、研削の加工性が不十分となる場合があり、一方、金属比が12を超えるものは金属サリシレート系清浄剤として不安定であり、製品とした場合に沈殿物を生じる可能性があるため好ましくない。
なお、ここでいう金属比とは、金属元素の価数×金属元素含有量(mol)/せっけん基(即ち、アルキルサリチル酸基などの基)含有量(mol)で表され、即ち、金属比はカルシウムサリシレート中のアルキルサリチル酸基含有量に対するカルシウム含有量を示す。
なお、ここでいう全塩基価とは、JIS K 2501「石油製品及び潤滑油−中和価試験方法」の7.に準拠して測定される過塩素酸法による全塩基価[mgKOH/g]をいう。
[B]成分の含有量が0.5質量%未満の場合、加工効率及び工具寿命の向上効果が不十分となる傾向にあり、20質量%を超えると金属加工油組成物の安定性が低下して析出物が生じやすくなる傾向にあるため、それぞれ好ましくない。
表1に示す通りに各潤滑油組成物を調製した。基油の含有量は基油全量基準であり、添加剤の含有量は組成物全量基準である。各潤滑油組成物に対して、下記の試験を行い、その結果を表1に併記した。なお、比較例2は流動性が悪くタッピング試験での性能評価を行うことができなかった。
各潤滑油組成物について、下記の加工条件にて標準油に対するタッピングエネルギー効率Eを測定し、この試験による切削性能評価を行った。
・被削材:S25C
・工具径:8mm
・タップピッチ:1.25mm
・タップすくい角:10度
・タップ食いつき角:1.5度
・タップ下穴径:6.8mm
・回転数:360rpm
・加工数:1穴
・標準油:DIDA(アジピン酸ジイソデシル)
・供給油剤量:9.0ml/分
無作為に選んだ10人の人間にサンプルに臭気があるか否かを判断してもらい、8人以上が臭気有りとしたものを不合格とした。
Claims (4)
- 40℃における動粘度が2〜68mm2/sの潤滑油基油、[A]一般式(1)で示されるジアルキルポリサルファイド、および[B]一般式(2)で示されるカルシウムサリシレートからなる金属加工用潤滑油組成物であって、前記[A]成分の含有量が組成物全量基準で1〜4.56質量%、前記[B]成分の含有量が組成物全量基準で0.5〜4.76質量%であることを特徴とする金属加工用潤滑油組成物。
R1−Sm−R2 (1)
(式中、R1およびR2は、それぞれ個別に炭素数4〜16の直鎖または分枝のアルキル基を示す。mは平均硫黄架橋数を表し、2.5以上4.2以下の数を示す。)
- ジアルキルポリサルファイドのアルキル鎖が分岐状アルキル基であることを特徴とする請求項1に記載の金属加工用潤滑油組成物。
- カルシウムサリシレートの金属比が0.3以上9以下であることを特徴とする請求項1または2に記載の金属加工用潤滑油組成物。
- 切削加工用であることを特徴とする請求項1〜3のいずれかに記載の金属加工用潤滑油組成物。
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