TW201435080A - 冷凍機用作動流體組合物 - Google Patents

冷凍機用作動流體組合物 Download PDF

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TW201435080A
TW201435080A TW102144695A TW102144695A TW201435080A TW 201435080 A TW201435080 A TW 201435080A TW 102144695 A TW102144695 A TW 102144695A TW 102144695 A TW102144695 A TW 102144695A TW 201435080 A TW201435080 A TW 201435080A
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ester
acid
refrigerant
fluid composition
polyol
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Masanori Saito
Takeshi Okido
Souichirou Konno
Kuniko ADEGAWA
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Jx Nippon Oil & Energy Corp
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Abstract

本發明提供一種冷凍機用作動流體組合物,其包含:冷凍機油,其含有混合酯作為基油,該混合酯係將(A)由特定之多元醇、碳數6~12之多元酸、及碳數4~18之一元醇或碳數4~18之一元脂肪酸合成的複合酯,及(B)由特定之多元醇與碳數4~18之一元脂肪酸合成的多元醇酯,以上述(A)複合酯/上述(B)多元醇酯之質量比為5/95~95/5混合而成;及作為冷媒之二氟甲烷;且該冷凍機用作動流體組合物於溫度80℃、絕對壓力2.1 MPa下之冷媒溶解黏度為5.5 mm2/s以上。

Description

冷凍機用作動流體組合物
本發明係關於一種冷凍機用作動流體組合物。再者,本發明中所指之「冷凍機」包括:汽車用空調機、除濕器、冰箱、冷凍冷藏倉庫、自動販賣機、展示櫃、化工廠等中之冷卻裝置、住宅用空調機、櫃式空調機、熱水用熱泵等。
於冷凍、空氣調節之領域中,目前作為冰箱、汽車空調機、室內空調機、工業用冷凍機等之冷媒,廣泛使用有作為氫氟碳(HFC,hydrofluorocarbon)之1,1,1,2-四氟乙烷(R134a)、或作為二氟甲烷(R32)與五氟乙烷(R125)之以質量比1/1之混合冷媒之R410A等。然而,關於該等HFC冷媒,雖然臭氧破壞係數(ODP,Ozone Depleting Potential)為零,但全球暖化係數(GWP,Global Warming Potential)較高為1000以上,故而因以保護地球環境為目標之所謂含氟氣體法規(F-gas regulation)而導致使用受到限制。
作為GWP較高之冷媒之代替品,單獨之二氟甲烷(R32)因其熱力學特性而作為候選被研究。R32之GWP略高為675,但由於氣體之壓力較高,為高效率冷媒,因此正作為有期望之候選受到研究。
由於在使用R32或包含R32之混合冷媒等壓力變高之冷媒時,在壓縮機中之噴出溫度變高,因此用以將壓縮機內潤滑之冷凍機油之油膜變薄,潤滑條件變嚴苛,故而需要潤滑性良好之冷凍機油。
於專利文獻1中,作為R32冷媒用冷凍機油,提出一種由三羥甲 基丙烷及/或新戊二醇與特定之二元酸、一元醇或一元脂肪酸合成之酯;於專利文獻2中,作為單一R32或包含50%以上之R32之混合冷媒用,提出一種酯系冷凍機油,其包含一元脂肪酸之碳數為5以下者20~60質量%,碳數大於8之脂肪酸係使用支鏈脂肪酸,且於40℃下之黏度為32~100 cst。關於通常之工業用潤滑油之基油,於專利文獻3中,提出有一種潤滑油基油,其包含如下合成酯:該合成酯係使含有三羥甲基丙烷90質量%以上之醇成分與羧酸成分反應而獲得,上述羧酸成分含有碳數8~12之一元脂肪酸及己二酸,且係以總量計含有90質量%以上之以總量計含有辛酸及/或癸酸90質量%以上之碳數8~12之一元脂肪酸及己二酸。
先前技術文獻 專利文獻
專利文獻1:日本專利特開2011-184536號公報
專利文獻2:日本專利特開2002-129179號公報
專利文獻3:日本專利特開2012-102235號公報
然而,今後,冷凍機器之滑動部之負載條件將變得更嚴苛,故而要求於R32冷媒共存並溶解於冷凍機油中之情形時耐磨耗性優異之作動流體。
本發明係鑒於上述課題而完成者,其目的在於提供一種冷凍機用作動流體組合物,其即便於冷媒共存且溶解於冷凍機油中而產生之嚴苛之潤滑條件下,亦可維持較厚之油膜,耐磨耗之效果增大,長期可靠性優異。
本發明者等人發現如下冷凍、空氣調節用作動流體形成較厚之 油膜而顯示出較高之耐磨耗性,從而完成本發明,該冷凍、空氣調節用作動流體包含:冷凍機油,其係將調配有由特定之多元醇、多元酸、一元醇或一元脂肪酸合成之複合酯、及由特定之多元醇與一元脂肪酸合成之多元醇酯的酯作為基油;及作為冷媒之二氟甲烷;且特定條件下之冷媒溶解黏度較高。
即,本發明提供下述[1]~[6]中記載之冷凍機用作動流體組合物。
[1]一種冷凍機用作動流體組合物,其包含:冷凍機油,其含有混合酯作為基油,該混合酯係將(A)由選自新戊二醇、三羥甲基丙烷及季戊四醇中之至少一種多元醇、碳數6~12之多元酸、及碳數4~18之一元醇或碳數4~18之一元脂肪酸合成的複合酯,及(B)由選自新戊二醇、三羥甲基丙烷、季戊四醇及二季戊四醇中之至少一種多元醇與碳數4~18之一元脂肪酸合成的多元醇酯,以上述(A)複合酯/上述(B)多元醇酯之質量比為5/95~95/5混合而成;及作為冷媒之二氟甲烷;且溫度80℃、絕對壓力2.1MPa下之冷媒溶解黏度為5.5mm2/s以上。
[2]如[1]記載之冷凍機用作動流體組合物,其中構成上述(A)複合酯之上述多元醇為新戊二醇及/或三羥甲基丙烷。
[3]如[1]或[2]記載之冷凍機用作動流體組合物,其中構成上述(A)複合酯之多元酸為己二酸及/或癸二酸。
[4]如[1]至[3]中任一項記載之冷凍機用作動流體組合物,其中構成上述(A)複合酯之上述一元醇為碳數8~10之醇。
[5]如[1]至[4]中任一項記載之冷凍機用作動流體組合物,其中上述(B)多元醇酯為由新戊二醇及/或季戊四醇與碳數4~9之一元脂肪酸 合成之酯。
[6]如[1]至[5]中任一項記載之冷凍機用作動流體組合物,其中上述(B)多元醇酯為由季戊四醇與碳數4之支鏈脂肪酸及3,5,5-三甲基己酸之混合酸合成之酯。
本發明之冷凍機用作動流體組合物發揮如下特殊之效果:即便於二氟甲烷冷媒溶解而冷凍機油之黏度降低之嚴苛之潤滑條件下,耐磨耗性亦較高,且穩定性良好,可長期穩定地使用機器。
以下,詳細地對本發明之較佳之實施形態進行說明。
本發明之實施形態之冷凍機用作動流體組合物包含:冷凍機油,其含有混合酯作為基油,該混合酯係將(A)由選自新戊二醇、三羥甲基丙烷及季戊四醇中之至少一種多元醇、碳數6~12之多元酸、及碳數4~18之一元醇或碳數4~18之一元脂肪酸合成的複合酯,及(B)由選自新戊二醇、三羥甲基丙烷、季戊四醇及二季戊四醇中之至少一種多元醇與碳數4~18之一元脂肪酸合成的多元醇酯,以上述(A)複合酯/上述(B)多元醇酯之質量比為5/95~95/5混合而成;及作為冷媒之二氟甲烷;且溫度80℃、絕對壓力2.1MPa下之冷媒溶解黏度為5.5mm2/s以上。
上述複合酯與先前之冷凍機油相比,由於冷媒不易溶解,因此與冷媒之相溶性較低,但具有可使油膜維持較厚之特性。又,上述多元醇酯與冷媒之相溶性良好。於本實施形態中,可藉由以上述方式調配特性(尤其是冷媒溶解度)不同之複合酯及多元醇酯,而使冷媒共存時之油膜較厚,進而可提高作動流體之耐磨耗性。
再者,複合酯由於分子量變大,因此成為黏度較高之酯,故而不易與冷媒相溶,就向壓縮機之回油之方面而言,不適合單獨用作需要與冷媒之相溶性的冷凍機油之基油。本實施形態之特徵之一在於可藉由將複合酯與如上述多元醇酯般與冷媒之相溶性良好之油混合而取得特性之平衡的方面。
複合酯之較佳之動黏度於40℃下為20~500mm2/s,更佳之動黏度為40~400mm2/s,進而較佳之動黏度為50~200mm2/s,尤佳之動黏度為50~90mm2/s。又,黏度指數較佳為100以上,尤其較佳為110~160。
作為複合酯之合成方法,可列舉如下方法等:(A)調整多元醇與多元酸之莫耳比,而製成多元酸之羧基殘留之酯中間物,並利用一元醇將該羧基酯化;(B)調整多元醇與多元酸之莫耳比,而製成多元醇之羥基殘留之酯中間物,並利用一元脂肪酸將該羥基酯化。藉由上述(B)之方法而獲得之複合酯由於若於用作冷凍機油時進行水解,則生成相對較強之酸,因此與藉由上述(A)之方法而獲得之複合酯相比,穩定性會變得略差。作為本實施形態中之複合酯,較佳為穩定性更高之藉由上述(A)之方法而獲得之複合酯。
作為構成複合酯之多元醇,為了設為作為基油所較佳之黏度,較佳為新戊二醇、三羥甲基丙烷。再者,於使用四元之季戊四醇之情形時,與新戊二醇及三羥甲基丙烷相比,存在所獲得之複合酯之黏度較高,低溫特性亦較差之傾向。進而,更佳為可廣泛地進行黏度調整之新戊二醇。
又,若構成複合酯之多元醇除選自新戊二醇、三羥甲基丙烷及季戊四醇中之至少一種以外,進而含有除新戊二醇以外之碳數為2~10之二元醇,則可謀求潤滑性之提高而較佳。作為除新戊二醇以外之碳數為2~10之二元醇,可列舉:乙二醇、丙二醇、丁二醇、戊二 醇、己二醇、2-甲基-1,3-丙二醇、3-甲基-1,5-戊二醇、2,2-二乙基-1,3-戊二醇等,較佳為合成之基油之特性平衡良好之丁二醇,丁二醇有1,2-丁二醇、1,3-丁二醇、1,4-丁二醇、2,3-丁二醇等,但就特性方面而言,更佳為1,3-丁二醇、1,4-丁二醇。除新戊二醇以外之碳數為2~10之二元醇相對於選自新戊二醇、三羥甲基丙烷及季戊四醇中之多元醇1莫耳,較佳為1.2莫耳以下,尤其較佳為0.8莫耳以下,進而較佳為0.4莫耳以下。
構成複合酯之多元酸為碳數為6~12之多元酸。作為該多元酸,可列舉:己二酸、庚二酸、辛二酸、壬二酸、癸二酸、鄰苯二甲酸、偏苯三甲酸等,較佳為合成之酯之特性平衡優異、且獲取性良好之己二酸、癸二酸,其中,更佳為己二酸。該多元酸相對於選自新戊二醇、三羥甲基丙烷及季戊四醇中之多元醇1莫耳,較佳為0.4~4莫耳,尤其較佳為0.5莫耳~3莫耳,進而較佳為0.6莫耳~2.5莫耳。
於在藉由上述之多元醇與多元酸之反應而生成之複合酯中間物中殘留有羧基之情形時,該羧基藉由碳數4~18之一元醇而酯化。作為碳數4~18之一元醇,可列舉:直鏈或支鏈丁醇、直鏈或支鏈戊醇、直鏈或支鏈己醇、直鏈或支鏈庚醇、直鏈或支鏈辛醇、直鏈或支鏈壬醇、直鏈或支鏈癸醇、直鏈或支鏈十二烷醇、油醇等脂肪族醇。就特性平衡而言,較佳為碳數6~10之一元醇,尤其較佳為碳數8~10之一元醇,其中,就所合成之複合酯之良好之低溫特性之方面而言,較佳為2-乙基己醇及3,5,5-三甲基己醇。
又,於在藉由上述之多元醇與多元酸之反應而生成之複合酯中間物中殘留有羥基之情形時,該羥基藉由碳數4~18之一元脂肪酸而酯化。作為碳數4~18之一元脂肪酸,可列舉:直鏈或支鏈丁酸、直鏈或支鏈戊酸、直鏈或支鏈己酸、直鏈或支鏈庚酸、直鏈或支鏈辛酸、直鏈或支鏈壬酸、直鏈或支鏈癸酸、直鏈或支鏈十二烷酸、油酸 等。較佳為碳數8~10之一元脂肪酸,其中,就低溫特性之方面而言,較佳為2-乙基己酸及3,5,5-三甲基己酸。
另一方面,本實施形態中之多元醇酯為由選自新戊二醇、三羥甲基丙烷、季戊四醇、二季戊四醇中之至少一種多元醇與碳數4~18之一元脂肪酸合成之多元醇酯。
作為構成多元醇酯之多元醇,就特性平衡之方面而言,較佳為三羥甲基丙烷及季戊四醇,更佳為季戊四醇。
作為構成多元醇酯之碳數4~18之一元脂肪酸,可列舉:直鏈或支鏈丁酸、直鏈或支鏈戊酸、直鏈或支鏈己酸、直鏈或支鏈庚酸、直鏈或支鏈辛酸、直鏈或支鏈壬酸、直鏈或支鏈癸酸、直鏈或支鏈十二烷酸、油酸等。就低溫特性之方面而言,較佳為碳數4~9之一元脂肪酸,尤其更佳為支鏈丁酸、支鏈戊酸、支鏈己酸、支鏈庚酸、2-乙基己酸及3,5,5-三甲基己酸。
就與冷媒之相溶性之方面而言,最佳為由多元醇為季戊四醇、一元脂肪酸為碳數4~9之支鏈脂肪酸之混合酸合成之多元醇酯。
於本實施形態之冷凍機用作動流體組合物中,若將上述複合酯之含量設為(A),將上述多元醇酯之含量設為(B),則(A)/(B)以質量比計為5/95~95/5,為了進一步發揮各個酯之特性,較佳為20/80~80/20,更佳為30/70~70/30。
本實施形態中之冷凍機油於40℃下之動黏度較佳為3~500mm2/s,更佳為8~150mm2/s,進而較佳為20~100mm2/s。又,冷凍機油之黏度指數較佳為50以上,尤其較佳為80~120。
本實施形態中之冷凍機油之流動點較佳為-10℃以下,更佳為-20℃以下。
本實施形態中之冷凍機油之酸值為了防止腐蝕冷凍機或配管所使用之金屬,且抑制冷凍機油本身之劣化,較佳為可設為0.1 mgKOH/g以下,更佳為可設為0.05mgKOH/g以下。再者,本發明中之酸值意指依據JIS K2501「酸值試驗方法」測得之酸值。
又,本實施形態中之冷凍機油之燃點較佳為120℃以上,更佳為200℃以上。
又,本實施形態中之冷凍機油之水分含量較佳為200ppm以下,更佳為100ppm以下,最佳為50ppm以下。尤其是於用於密閉型冷凍機之情形時,就冷凍機油之穩定性或電氣絕緣性之觀點而言,要求水分含量較少。
又,本實施形態中之冷凍機油除了上述複合酯及多元醇酯以外,亦可進而含有礦物油系基油、合成系基油等其他基油。上述複合酯及多元醇酯之合計含量較佳為冷凍機油之80質量%以上,尤其較佳為95質量%以上。
於冷凍機之情形時,存在如上所述就防止全球暖化之觀點而言,自GWP較高之現行之HFC冷媒向低GWP之冷媒轉變之動向,必需與該等適應之冷凍機油,要求混合有冷媒及冷凍機油之較佳之作動流體。於本發明中,含有二氟甲烷作為冷媒,冷媒中之二氟甲烷之含量較佳為60~100質量%,尤其較佳為80~100質量%。
本實施形態之冷凍機用作動流體組合物中之冷凍機油組合物與冷媒之調配比率並無特別限制,相對於冷媒100質量份,冷凍機油組合物較佳為1~500質量份,更佳為2~400質量份。
本實施形態之冷凍機用作動流體組合物於溫度80℃、絕對壓力2.1MPa下之冷媒溶解黏度為5.5mm2/s以上,較佳為6.0mm2/s以上。又,本實施形態之冷凍機用作動流體組合物於溫度80℃、絕對壓力2.1MPa下之冷媒溶解黏度可設為10.0mm2/s以下。
本實施形態之作動流體組合物為了進而提高耐磨耗性,可含有各種添加劑。作為較佳之添加劑,有磷酸酯,作為尤其較佳之化合 物,為磷酸三苯酯(TPP,triphenyl phosphate)、磷酸三甲酚酯(TCP,tricresyl phosphate)。
又,作為較佳之硫系添加劑,有硫醚,作為該硫醚化合物,有多種,較佳為單硫醚化合物。其原因在於:例如二硫醚化合物般活性較高之硫化合物會使冷凍機油之穩定性變差,並使大量用於冷凍機器內部之銅變質。
本實施形態之冷凍機用作動流體組合物除上述添加劑以外,亦可於無損本發明之目的之範圍內含有自先前以來一直用於潤滑油之抗氧化劑、摩擦調整劑、抗磨耗劑、極壓添加劑、防銹劑、金屬減活劑、消泡劑等添加劑以進一步提高性能。
作為抗氧化劑,可含有二-第三丁基對甲酚之類之酚系化合物、烷基二苯胺之類之胺系化合物等。尤其較佳為以冷凍機油總量為基準而含有酚系化合物抗氧化劑0.02~0.5質量%。
作為摩擦調整劑,可列舉:脂肪族胺、脂肪族醯胺、脂肪族醯亞胺、醇、酯、磷酸酯胺鹽、亞磷酸酯胺鹽等,作為抗磨耗劑,可列舉二烷基二硫代磷酸鋅等,作為極壓添加劑,可列舉硫化烯烴、硫化油脂等,作為防銹劑,可列舉烯基琥珀酸酯或偏酯等,作為金屬減活劑,可列舉苯并三唑、苯并三唑衍生物等,作為消泡劑,可列舉聚矽氧化合物、聚酯化合物等。
實施例
以下,基於實施例及比較例,進而具體地對本發明進行說明,但本發明並不受以下實施例任何限定。
[實施例1~12、比較例1~5]
於實施例1~12及比較例1~5中,首先,使用如下所示之基材製備具有表1~3所示之組成之基油。
[A]複合酯
(A-1)使三羥甲基丙烷(1莫耳)與己二酸(2.4莫耳)進行反應而成之酯中間物進而與2-乙基己醇(2.0莫耳)進行反應,並藉由蒸餾去除殘存之未反應物而獲得的酯(40℃下之動黏度為68.8mm2/s,黏度指數為120)。
(A-2)使新戊二醇(1莫耳)與己二酸(0.8莫耳)進行反應而成之酯中間物進而與3,5,5-三甲基己酸(0.5莫耳)進行反應,並藉由蒸餾去除殘存之未反應物而獲得的酯(40℃下之動黏度為71.5mm2/s,黏度指數為114)。
(A-3)使三羥甲基丙烷(1莫耳)及1,3-丁二醇(0.2莫耳)與癸二酸(2.4莫耳)進行反應而成之酯中間物進而與正庚醇(1.6莫耳)進行反應,並藉由蒸餾去除殘存之未反應物而獲得的酯(40℃下之動黏度為77.3mm2/s,黏度指數為148)。
(A-4)使新戊二醇(1莫耳)及1,4-丁二醇(0.3莫耳)與己二酸(2.4莫耳)進行反應而成之酯中間物進而與2-乙基己醇(2.4莫耳)進行反應,並藉由蒸餾去除殘存之未反應物而獲得的酯(40℃下之動黏度為68.2mm2/s,黏度指數為144)。
(A-5)使新戊二醇(1莫耳)及1,4-丁二醇(0.4莫耳)與己二酸(3.1莫耳)進行反應而成之酯中間物進而與3,5,5-三甲基己醇(3.5莫耳)進行反應,並藉由蒸餾去除殘存之未反應物而獲得的酯(40℃下之動黏度為32.2mm2/s,黏度指數為161)。
(A-6)使新戊二醇(1莫耳)及1,4-丁二醇(0.3莫耳)與己二酸(2.4莫耳)進行反應而成之酯中間物進而與3,5,5-三甲基己醇(2.5莫耳)進行反應,並藉由蒸餾去除殘存之未反應物而獲得的酯(40℃下之動黏度為67.8mm2/s,黏度指數為145)。
(A-7)使新戊二醇(1莫耳)及1,4-丁二醇(0.2莫耳)與己二酸(1.9莫耳)進行反應而成之酯中間物進而與3,5,5-三甲基己醇(1.0莫耳)進行反 應,並藉由蒸餾去除殘存之未反應物而獲得的酯(40℃下之動黏度為150.0mm2/s,黏度指數為138)。
[B]多元醇酯
(B-1)新戊二醇與2-乙基己酸之酯(40℃下之動黏度為8.3mm2/s,黏度指數為56)。
(B-2)季戊四醇與2-甲基丙酸及3,5,5-三甲基己酸以莫耳比計為35:65之混合酸之酯(40℃下之動黏度為69.4mm2/s,黏度指數為95)。
(B-3)季戊四醇與2-甲基丙酸及3,5,5-三甲基己酸以莫耳比計為60:40之混合酸之酯(40℃下之動黏度為46.0mm2/s,黏度指數為78)。
(B-4)季戊四醇與2-乙基己酸及3,5,5-三甲基己酸以莫耳比計為45:55之混合酸之酯(40℃下之動黏度為70.1mm2/s,黏度指數為90)。
(B-5)季戊四醇與正戊酸及3,5,5-三甲基己酸以莫耳比計為80:20之混合酸之酯(40℃下之動黏度為23.4mm2/s,黏度指數為118)。
(B-6)季戊四醇與正戊酸及3,5,5-三甲基己酸以莫耳比計為40:60之混合酸之酯(40℃下之動黏度為51.0mm2/s,黏度指數為105)。
該等基油中之[A]、[B]之酯之合成反應係不使用觸媒、溶劑而進行,於最終步驟中藉由吸附處理(白土處理)而去除微量之雜質。再者,動黏度及黏度指數係依據JIS K2283進行測定並計算。
繼而,於實施例1~12及比較例1~5之各基油中,於任一情形時均調配作為抗氧化劑之二-第三丁基對甲酚(DBPC,di-tert-butyl-p-cresol)0.1質量%而製備冷凍機油。
關於實施例1~12及比較例1~5之冷凍機油,以如下所述之方式進行溶解黏度之測定及潤滑性試驗。
(冷媒溶解黏度之測定)
於放入有振動式黏度計之200ml之耐壓容器中,放入冷凍機油100g,並對容器內進行真空脫氣之後,放入R32冷媒而製備作動流體 組合物,將冷媒之壓力及耐壓容器之溫度調整為溫度80℃、絕對壓力2.1MPa之條件,進行黏度測定。將所獲得之結果示於表1~3中。
(潤滑性試驗)
於潤滑性試驗中,使用可設為與真實壓縮機類似之冷媒氛圍之神鋼造機股份有限公司製造之高壓氛圍摩擦試驗機(旋轉葉片材料與固定圓盤材料之旋轉滑動方式)。關於試驗條件,油量為600ml,試驗溫度為110℃,轉數為500rpm,負載荷重為80kgf,試驗時間為1小時,作為葉片材料,係使用SKH-51,作為圓盤材料,係使用FC250。試驗條件係將R32用於冷媒,試驗容器內壓力係設為3.1MPa。由於圓盤材料之磨耗量極少,因此耐磨耗之評價係藉由葉片材料之磨耗深度而進行。將所獲得之結果示於表1~3中。
可知實施例1~12之作動流體組合物之冷媒溶解黏度較高,且耐磨耗性良好。
[產業上之可利用性]
本發明之冷凍機用作動流體組合物具有如下特別之效果:二氟甲烷冷媒溶解時之黏度較高,即便於嚴苛潤滑條件下耐磨耗性亦優異,故而大幅提高潤滑性。因此,可較佳地用於具有壓縮機、冷凝器、節流裝置及蒸發器等,且於其等之間使冷媒循環之冷卻效率較高之冷凍、空氣調節系統中,尤其是具有旋轉型、擺動型、渦旋型等之壓縮機之系統中,於室內空調機、櫃式空調機、冰箱、汽車空調機、工業用冷凍機等領域較為有用。

Claims (6)

  1. 一種冷凍機用作動流體組合物,其包含:冷凍機油,其含有混合酯作為基油,該混合酯係將(A)由選自新戊二醇、三羥甲基丙烷及季戊四醇中之至少一種多元醇、碳數6~12之多元酸、及碳數4~18之一元醇或碳數4~18之一元脂肪酸合成的複合酯,及(B)由選自新戊二醇、三羥甲基丙烷、季戊四醇及二季戊四醇中之至少一種多元醇與碳數4~18之一元脂肪酸合成的多元醇酯,以上述(A)複合酯/上述(B)多元醇酯之質量比為5/95~95/5混合而成;及作為冷媒之二氟甲烷;且於溫度80℃、絕對壓力2.1MPa下之冷媒溶解黏度為5.5mm2/s以上。
  2. 如請求項1之冷凍機用作動流體組合物,其中構成上述(A)複合酯之上述多元醇為新戊二醇及/或三羥甲基丙烷。
  3. 如請求項1或2之冷凍機用作動流體組合物,其中構成上述(A)複合酯之多元酸為己二酸及/或癸二酸。
  4. 如請求項1至3中任一項之冷凍機用作動流體組合物,其中構成上述(A)複合酯之上述一元醇為碳數8~10之醇。
  5. 如請求項1至4中任一項之冷凍機用作動流體組合物,其中上述(B)多元醇酯為由新戊二醇及/或季戊四醇與碳數4~9之一元脂肪酸合成之酯。
  6. 如請求項1至5中任一項之冷凍機用作動流體組合物,其中上述(B)多元醇酯為由季戊四醇與碳數4之支鏈脂肪酸及3,5,5-三甲基己酸之混合酸合成之酯。
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