申请人:Kao Corporation
公开号:EP0779289A1
公开(公告)日:1997-06-18
The present invention relates to a synthetic lubricating oil comprising cyclic ketals or cyclic acetals obtained by a reaction between one or more polyhydric alcohols having an even number of hydroxyl groups of not less than 4 and not more than 10 and one or more specific carbonyl compounds, or one or more ketals or acetals which are reactive derivatives of said carbonyl compounds; a working fluid composition for a refrigerating machine comprising a hydrofluorocarbon and a refrigeration oil containing the cyclic ketals or cyclic acetals; and novel compounds of the above cyclic acetals and a production method thereof. The present invention provides a synthetic lubricating oil which shows a good thermal stability, a good oxidation resistance, no carboxylic acid formation due to hydrolysis and a low hygroscopicity and is inexpensive as well. Also, a working fluid composition for a refrigerating machine which shows a good insulating property, favorable hygroscopicity, and no carboxylic acid formation due to hydrolysis as well as being inexpensive can be provided.
本发明涉及一种合成润滑油,它包含由一种或多种羟基数目不少于 4 个但不多于 10 个的多元醇与一种或多种特定羰基化合物或一种或多种作为上述羰基化合物反应衍生物的酮或缩醛反应而得的环酮或环缩醛;用于制冷机的工作流体组合物,包括氢氟碳化合物和含有环酮或环乙醛的冷冻油;以及上述环乙醛的新型化合物及其生产方法。本发明提供了一种合成润滑油,它具有良好的热稳定性和抗氧化性,不会因水解而形成羧酸,吸湿性低,而且价格低廉。此外,本发明还提供了一种用于制冷机的工作液组合物,它具有良好的绝缘性能、吸湿性好、不会因水解而形成羧酸,而且价格低廉。