TW201343899A - 冷凍機用潤滑油組成物(三) - Google Patents

冷凍機用潤滑油組成物(三) Download PDF

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TW201343899A
TW201343899A TW102110854A TW102110854A TW201343899A TW 201343899 A TW201343899 A TW 201343899A TW 102110854 A TW102110854 A TW 102110854A TW 102110854 A TW102110854 A TW 102110854A TW 201343899 A TW201343899 A TW 201343899A
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carbon atoms
lubricating oil
carbon
oil composition
integer
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Tomoya Matsumoto
Tadashi Kisen
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Idemitsu Kosan Co
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Abstract

本發明的冷凍機用潤滑油組成物係在基油中摻合入添加劑而成,而前述添加劑係具有聯苯結構或茋結構的烴化合物。使用本發明冷凍機用潤滑油組成物的開放型汽車空調、電動汽車空調、瓦斯熱泵、空調、冰箱、自動販賣機、展示櫃、熱水供給系統、及冷凍.暖房系統等之冷凍機器,可長期間安定地進行冷媒之漏洩檢測。故,本發明的冷凍機用潤滑油組成物係當使用對該等各種機器呈較低安定性的不飽和氟龍冷媒時極為有效。

Description

冷凍機用潤滑油組成物(三) 發明領域
本發明係關於冷凍機用潤滑油組成物。
發明背景
在空調機系統、冷卻系統中有使用各種冷媒,但在使用中會有冷媒洩漏至外部的可能性。所以會有將冷媒漏洩處予以特定的必要,即便時下仍簡易地採取將肥皂水吹至系統內的配管或接頭,利用有無氣泡而檢測冷媒洩漏的方法。近年有開發出使用螢光劑的漏出檢測方法,就汽車空調亦有在冷凍循環的儲液乾燥器內配置冷媒洩漏檢測用螢光劑者。
文獻1(日本專利特開昭61-211391號公報)、文獻2(日本專利特開2006-52938號公報)係藉由將由二苯并哌喃、苝等多環芳香族化合物構成的螢光染料導入冷卻系統中,而檢測冷媒洩漏。
另一方面,空調機系統及冷卻系統所使用的冷媒,因為屬於會對地球暖化造成影響的化合物,因而探討地球暖化係數(GWP)低的新穎冷媒。例如使用R1234yf冷媒等在分子中於碳-碳間具有不飽和鍵的冷媒(不飽和氟龍冷 媒)、或地球暖化係數小、能將系統容量小型化的冷媒(R32)等。
然而現已得知,如文獻1、2所記載的習知螢光劑,若將之利用在使用地球暖化係數低之冷媒的系統,會導致冷凍機油的熱性安定性、化學安定性降低。
發明概要
本發明目的在於提供:即便含有冷媒洩漏檢測用螢光劑,仍可具有與現行冷凍機油同等級以上熱性安定性及化學安定性的冷凍機用潤滑油組成物。
為解決前述課題,本發明係提供如下的冷凍機用潤滑油組成物。
[1]一種冷凍機用潤滑油組成物,係在基油中摻合添加劑而成者,其特徵在於:前述添加劑係具有聯苯結構或茋結構的烴化合物。
[2]如上述冷凍機用潤滑油組成物,其中使用該組成物的冷凍機之冷媒係飽和氟化烴化合物(飽和HFC)、二氧化碳(CO2)、碳數5以下之碳氫化合物(HC)、氨、及下述分子式(A)所0示含氟有機化合物中之至少任一者。
CpOqFrRs (A)
(式中,R係表示Cl、Br、I或氫;p係1至6的整數,q係0至2的整數,r係1至14的整數,s係0至13的整數。但,當q為0時,p係2至6;分子中具有1個以上的碳-碳不飽和鍵。)
[3]上述冷凍機用潤滑油組成物中,前述冷媒係碳數1至3的飽和HFC、或碳-碳間具有雙鍵的碳數3之不飽和HFC。
[4]上述冷凍機用潤滑油組成物中,前述基油係選自於烷基苯、烷基萘、聚-α-烯烴、聚乙烯醚、聚伸烷基二醇、聚碳酸酯、多元醇酯、及下式(1)所示醚系化合物中之至少1種。
Ra-[(ORb)n-(B)-(ORc)k]x-Rd (1)
(式中,Ra、Rd分別係氫原子、碳數1至10的烷基、碳數2至10的醯基或具有2個至6個鍵結部且碳數1至10的烴基;Rb、Rc分別係碳數2至4的伸烷基;n、k係0至20的整數;x係1至6的整數。(B)係含有3個以上之下式(2)所示單體單元的聚合部。)
(式中,R4、R5及R6分別係表示氫原子或碳數1至8的烴基,該等係相互可相同亦可相異;R7係表示碳數1至10的二元烴基、或碳數2至20的二價含醚鍵結氧之烴基;R8係表示氫原子、碳數1至20的烴基;m係表示平均值0至10的數值,當m為複數時,在每個構成單元係可相同亦可相異;R4至R8係在每個構成單元可相同亦可互異,又當R7O為複數時,複數R7O係可相同亦可相異。又,式(1)的k、n均為0時,式(2)中,m係1以上的整數。)
[5]上述冷凍機用潤滑油組成物中,100℃動黏度係在1 至50mm2/s範圍。
[6]上述冷凍機用潤滑油組成物中,在基油中進一步摻合入選自極壓劑、油性劑、抗氧化劑、酸捕獲劑、金屬鈍化劑及消泡劑中之至少1種添加劑。
[7]上述冷凍機用潤滑油組成物,係使用於開放型汽車空調、電動汽車空調、瓦斯熱泵、空調、冰箱、自動販賣機、展示櫃、熱水供給系統、及冷凍.暖房系統等的冷凍機器。
本發明的冷凍機用潤滑油組成物係在各種冷媒環境下的熱性及化學性呈安定,長期間發揮漏洩檢測能力。所以,對於使用具有不飽和鍵之不安定冷媒的冷凍機,適宜使用本發明的潤滑油組成物。
用以實施發明之形態
本發明的冷凍機用潤滑油組成物(以下亦簡稱「本組成物」)係在基油中摻合添加劑而成的冷凍機用潤滑油組成物,前述添加劑係具有聯苯結構的烴化合物。以下進行詳細說明。
基油係可為礦油或合成系基油任一者。合成系基油以如選自烷基苯(AB)、烷基萘(AN)、聚-α-烯烴(PAO)、聚乙烯醚(PVE)、聚伸烷基二醇(PAG)、聚碳酸酯(PC)、多元醇酯(POE)、及前述式(1)所示醚化合物(ECP)之至少1種為 適宜。
以下,首先針對該等基油進行說明。
(1)礦油
礦油係以所謂的高度精製礦油為佳,例如將石蠟基系原油、中間基系原油或環烷基系原油施行常壓蒸餾、或將常壓蒸餾的殘渣油施行減壓蒸餾而獲得的餾出油依照常法進行精製,而獲得的精製油;或者經精製後,更進一步施行深脫蠟處理(deep-dewaxing process)而獲得的深脫蠟油;以及更進一步利用氫化處理而獲得的氫化處理油等。
(2)烷基苯(AB)
舉凡冷凍機油所使用的烷基苯均可使用,但就熱安定性的觀點,係以烷基的總碳數(烷基為複數時,便為各個烷基的總和)達20以上之烷基苯(單烷基苯、二烷基苯、三烷基苯)為佳,較佳係總碳數達20以上且具有2個以上烷基者(二烷基苯等)。
(3)烷基萘(AN)
烷基萘係以使用萘環上鍵結著2或3個烷基者為佳。特別係就熱安定性的觀點,此種烷基萘更佳係總碳數達20以上者。本發明中,該等烷基萘係可單獨使用、亦可混合使用。
(4)聚-α-烯烴(PAO)
聚-α-烯烴係可使用各種物,但通常係碳數8至18的α-烯烴之聚合物。其中,就黏度指數、低溫流動性、及蒸發減量的觀點,可舉例如1-十二碳烯、1-癸烯或1-辛烯 的聚合物等。其中,係以1-癸烯的聚合物為佳。另外,本發明中,就熱安定性的觀點,聚-α-烯烴宜使用其氫化處理物。該等聚-α-烯烴係可單獨使用、亦可混合使用。
(5)聚乙烯醚(PVE)
當作基油使用的聚乙烯醚有如:由乙烯醚單體進行聚合而獲得者(以下稱「聚乙烯醚I」)、及由乙烯醚單體與具有烯烴性雙鍵的烴單體進行共聚合而獲得者(以下稱「聚乙烯醚共聚物II」)。
當作聚乙烯醚I的原料使用之乙烯醚單體,係可舉例如:乙烯甲醚、乙烯乙醚、乙烯基正丙醚、乙烯基異丙醚等。該等乙烯醚系單體係可利用公知方法進行製造。
當作聚乙烯醚共聚物II之原料使用的乙烯醚單體,係可舉例如與前述例示的乙烯醚單體相同者,該等係可單獨使用1種、亦可組合使用2種以上。又,另一原料之具有烯烴性雙鍵的烴單體,係可舉例如:乙烯、丙烯、各種丁烯、各種戊烯、各種己烯、各種庚烯、各種辛烯、二異丁烯、三異丁烯、苯乙烯、α-甲基苯乙烯、各種烷基取代苯乙烯等。特別係以聚乙基乙烯醚、聚異丁基乙烯醚、聚乙基乙烯醚與聚異丁基乙烯醚的共聚物為佳。
(6)聚伸烷基二醇(PAG)
本組成物中,能當作基油使用的聚伸烷基二醇係可舉例如下式(3)所示化合物。
R9-[(OR10)m1-OR11]n1 (3)
式中,R9係表示氫原子、碳數1至10的烷基、碳數2至 10的醯基或具有2個至6個鍵結部且碳數1至10的脂肪族烴基;R10係表示碳數2~4的伸烷基;R11係表示氫原子、碳數1~10的烷基或碳數2至10的醯基;n1係係表示1至6的整數,m1係表示m1×n1平均值成為6至80的數值。
就經濟性及效果的觀點,此種聚伸烷基二醇類係適宜為例如:聚氧化丙二醇二甲醚、聚氧化丙二醇單甲醚、聚(氧乙烯)(氧化伸丙基)二醇二甲醚、聚(氧乙烯)(氧化伸丙基)二醇單甲醚、聚氧化丙二醇單丁醚、聚氧化丙二醇二醋酸酯等。
(7)聚碳酸酯(PC)
本組成物中,當作基油使用的聚碳酸酯系化合物,係1分子中具有2個以上碳酸酯鍵結的聚碳酸酯,即可適當舉例如選自①下式(4)所示化合物、及②下式(5)所示化合物中之至少一種。
式中,Z係表示從碳數1至12的c元醇中去除羥基後的殘基;R12係表示碳數2至10的直鏈狀或分支狀伸烷基;R13係表示碳數1至12的一元烴基、或含有R15(O-R14)d-(但,R15係表示氫原子或碳數1至12的一元烴基;R14係表示碳數2至10的直鏈狀或分支狀伸烷基;d係表示1至20的整數)所醚鍵結的基;a係表示1至30的整數,b係表示1至50的整數,c係表示1至6的整數。
式中,R16係表示碳數2至10的直鏈狀或分支狀伸烷基;e係表示1至20的整數;Z、R12、R13、a、b及c係如同前述。
前述式(4)及式(5)中,Z係從碳數1至12的一元至六元醇中去除羥基後的殘基,尤其以從碳數1至12的一元醇中去除羥基後的殘基為佳。
(8)多元醇酯(POE)
本組成物中,當作基油使用的多元醇酯系化合物,係宜使用二醇或具有3個至20個左右羥基的多元醇、與碳數1至24左右之脂肪酸的酯。就水解安定性的觀點,尤其以多元醇為佳、更佳係新戊二醇、三羥甲基乙烷、三羥甲基丙烷、三羥甲基丁烷、與新戊四醇的酯,就與冷媒間之相溶性及水解安定性特優的點,最佳係新戊四醇的酯。
就潤滑性的觀點,脂肪酸以碳數3以上者為佳、較佳係碳數4以上者、更佳係碳數5以上者、最佳係碳數10以上者。又,就與冷媒間之相溶性的觀點,係碳數18以下者為佳、較佳係碳數12以下者、更佳係碳數9以下者。又,可為直鏈狀脂肪酸、分支狀脂肪酸任一者,就潤滑性的觀點,係直鏈狀脂肪酸為佳,就水解安定性的觀點,係分支狀脂肪酸為佳。又,可為飽和脂肪酸、不飽和脂肪酸任一者。特別以新戊四醇辛酸壬酸酯為佳。
(9)醚系化合物
本組成物中,基油宜為例如具有下式(1)所示結構的醚系化合物。
Ra-[(ORb)n-(B)-(ORc)k]x-Rd (1)
其中,式中,Ra、Rd分別係氫原子、碳數1至10的烷基、碳數2至10的醯基或具有2個至6個鍵結部且碳數1至10的烴基;Rb、Rc分別係碳數2至4的伸烷基;n、k係0至20的整數;x係1至6的整數。(B)係下式(2)所示單體單元含有3個以上的聚合部。
式(2)中,R4、R5及R6分別係表示氫原子或碳數1至8的烴基,該等係相互可相同亦可相異。R7係表示碳數1至10的二元烴基、或碳數2至20之二價含醚鍵結氧之烴基。R8係表示氫原子、碳數1至20的烴基。m係表示平均值為0至10的數值,當m為複數時,在每個構成單元可相同亦可相異;R4至R8係在每個構成單元可相同亦可互異,又當R7O具有複數時,複數R7O係可相同亦可相異。又,式(1)的k、n均為0時,式(2)中m係1以上的整數。
如前述的醚系化合物係以伸烷基二醇或聚伸烷基二醇、或該等的單醚為起始劑,藉由使乙烯醚單體進行聚合便可進行製造。
就合成反應安定性的觀點,醚系化合物係以具有如下述末端結構者為佳,即末端係在式(1)中,Ra為氫原 子、n=0,且其餘末端具有Rd為氫原子、k=0所示結構者。特別係以聚丙二醇與聚乙基乙烯醚的共聚物、聚乙二醇與聚乙基乙烯醚的共聚物為佳。
再者,上述各合成系基油(化合物)的分子量,就抑制蒸發、引火點、當作冷凍機油用時的性能等觀點,較佳係150至5,000範圍、更佳係300至3000範圍。又,黏度指數較佳係60以上。
本發明中,上述各基油(礦油、合成系基油)係可單獨使用亦可混合使用,但不管何種情況,均係100℃動黏度1mm2/s以上且50mm2/s以下為佳、較佳為3mm2/s以上且50mm2/s以下、更佳為5mm2/s以上且30mm2/s以下、甚佳為5mm2/s以上且20mm2/s以下。
本組成物的基油黏度指數係以60以上為佳、較佳係80以上、更佳係100以上。
本組成物係對基油,將具有聯苯結構或茋結構的烴化合物當作添加劑並摻合入。以下,將該添加劑亦稱「本添加劑」。
本添加劑係當冷媒及本組成物從冷凍機(冷凍系統)洩漏時具有當作漏洩檢測劑的功能。即,具有如聯苯結構、茋結構之類共軛系的烴化合物,因為藉由照射紫外線會發出螢光,因而可輕易地發現洩漏處。且,經摻合本添加劑的潤滑油組成物及冷媒而成之系統,不管熱性與化學性均呈安定。
此處,所謂「具有聯苯結構的烴化合物」係指例 如具有下式(6)至(8)所示骨架結構的化合物。苯環數並無特別的限制,且鍵結位置亦無限制。又,在各苯環上亦可鍵結著一或複數烴基(例如烷基),鍵結位置亦無制限。
再者,所謂「具有茋結構的烴化合物」,係指具有例如下式(9)、(10)所示骨架結構的化合物。茋結構係可為順式亦可為反式。苯環數與茋結構單元數並無特別的限制,且鍵結位置亦無限制。又,在各苯環上亦可鍵結著一或複數烴基(例如烷基),鍵結位置亦無制限。
上述烴化合物以例如:對雙(鄰甲基苯乙烯基)苯、2,5,2''',5'''-四甲基-對聯四苯、或2",3,3',3'''-四甲基-1,1': 4',1":4",1'''-聯四苯等為佳。其中,甚佳係對雙(鄰甲基苯乙烯基)苯。
依潤滑油組成物基準計,上述烴化合物的摻合量(添加量)係以0.001質量%以上且10質量%以下為佳、較佳係0.001質量%以上且1質量%以下、更佳係0.001質量%以上且0.5質量%以下、最佳係0.001質量%以上且0.1質量%以下。若摻合量少於該下限值,即便本組成物從冷凍機中洩漏出但螢光量仍偏少,會有不易得知漏洩處的可能性。另一方面,即便摻合多於上限值,並不會特別提升當作漏洩檢測劑的效果,反而會有阻礙本組成物安定性的可能性。
本組成物所適用的冷媒亦可舉例如:飽和氟化烴化合物(飽和HFC)、二氧化碳(CO2)、碳數5以下的碳氫化合物(HC)、或氨等,但就地球暖化係數低的觀點,係以含有諸如選自下述分子式(A)所示化合物中之至少1種的含氟有機化合物、或該含氟有機化合物與飽和氟化烴化合物之組合的冷媒。
CpOqFrRs (A)
(式中,R係表示Cl、Br、I或氫;p係1至6的整數,q係0至2的整數,r係1至14的整數,s係0至13的整數。但,當q為0時,p係2至6;分子中具有1個以上的碳-碳不飽和鍵。)
上述飽和氟化烴化合物(飽和HFC)係可單獨當作冷媒使用,但屬於視需要亦可混合於選自前述通式(A)所示化合物中至少1種含氟有機化合物的冷媒。
該飽和HFC宜為碳數1至4之烷烴的氟化物,更佳 係屬於碳數1至2之甲烷、乙烷的氟化物之諸如:三氟甲烷、二氟甲烷、1,1-二氟乙烷、1,1,1-三氟乙烷、1,1,2-三氟乙烷、1,1,1,2-四氟乙烷、1,1,2,2-四氟乙烷、1,1,1,2,2-五氟乙烷。
再者,當該飽和HFC係與上述(A)化合物冷媒混合使用時,相對於冷媒全量,其摻合量以30質量%以下為佳、較佳係20質量%以下、更佳係10質量%以下。
其次,針對前述分子式(A)所示冷媒進行詳細說明。
分子式(A)係表示分子中的元素種類與數量,式(A)係表示碳原子C的數量p為1至6的含氟有機化合物。若屬於碳數1至6的含氟有機化合物,便可具有當作冷媒時所要求的沸點、凝固點、蒸發潛熱等物理、化學性質。
分子式(A)中,Cp所示p個碳原子的鍵結形態係包括碳-碳單鍵、碳-碳雙鍵等不飽和鍵、碳-氧雙鍵等。就安定性的觀點,碳-碳不飽和鍵係碳-碳雙鍵為佳,其數量係1個以上、以1個為佳。
分子式(A)中,Oq所示q個氧原子的鍵結形態宜為醚基、羥基或源自羰基的的氧。該氧原子的數量q係可為2,亦包括具有2個醚基或羥基等的情況。當Oq的q為0且分子中未含有氧原子時,p便為2至6,且分子中具有1個以上碳-碳雙鍵等不飽和鍵。即,Cp所示p個碳原子的鍵結形態中之至少1者必需係碳-碳不飽和鍵。
分子式(A)中,R係表示Cl、Br、I或氫,可為該等中之任一者,但就破壞臭氧層的威脅小之觀點,R係以氫 為佳。
如上述,分子式(A)所示含氟有機化合物適當者可舉例如:不飽和氟化烴化合物、氟化醚化合物、氟化醇化合物及氟化酮化合物等。
以下,針對該等化合物中之不飽和氟化烴化合物進行詳細說明。
本發明中,當作冷凍機之冷媒使用的不飽和氟化烴化合物係可舉例如分子式(A)中,R為氫、p為2至6、q為0、r為1至12、s為0至11的不飽和氟化烴化合物。
此種不飽和氟化烴化合物較佳可舉例如:碳數2至6的直鏈狀或分支狀鏈狀烯烴、或碳數4至6的環狀烯烴之氟化物。
具體係可舉例如:經導入1個至3個氟原子的乙烯、經導入1個至5個氟原子的丙烯、經導入1個至7個氟原子的丁烯類、經導入1個至9個氟原子的戊烯類、經導入1個至11個氟原子的己烯類、經導入1個至5個氟原子的環丁烯、經導入1個至7個氟原子的環戊烯、經導入1個至9個氟原子的環己烯等。
該等不飽和氟化烴化合物之中,以碳數2至3的不飽和氟化烴化合物為佳、較佳係丙烯的氟化物。具體而言,就地球暖化係數低的觀點,分子式(A)所示化合物係以C3HF3、C3H2F4及C3H3F3中之任一分子式所示化合物。該等丙烯的氟化物係可舉例如:五氟丙烯的各種異構物、3,3,3-三氟丙烯、1,3,3,3-四氟丙烯、及2,3,3,3-四氟丙烯等,就地 球暖化係數低的觀點,甚佳係1,3,3,3-四氟丙烯(HFO1234ze)、及2,3,3,3-四氟丙烯(HFO1234yf)。
再者,碳數1至2的飽和氟化烴冷媒、與碳數3的不飽和氟化烴冷媒之組合亦適用。此種組合係可舉例如:前述HFO1234yf與CH2F2(HFC32)的組合、HFO1234ze與HFC32的組合、HFO1234yf與CHF2CH3(HFC152a)的組合、以及HFO1234ze與HFC152a的組合等。
本組成物中,在不致損及本發明目的之範圍內,亦可含有從極壓劑、油性劑、抗氧化劑、酸捕獲劑、金屬鈍化劑及消泡劑中選擇之至少1種添加劑。
極壓劑係可舉例如:磷酸酯、酸性磷酸酯、亞磷酸酯、酸性亞磷酸酯及該等的胺鹽等磷系極壓劑;羧酸的金屬鹽;硫化油脂、硫化脂肪酸、硫化酯、硫化烯烴、二烴基多硫化物、硫代胺基甲酸酯類、硫代萜烯類、及硫代二丙酸二烷基酯類等硫系極壓劑。
就潤滑性及安定性的觀點,相對於組成物全量,上述極壓劑的摻合量係以0.001質量%以上且10質量%以下為佳。
油性劑例係可舉例如:硬脂酸、油酸等脂肪族飽和及不飽和單羧酸;二聚酸、氫化二聚酸等聚合脂肪酸;篦麻醇酸、12-羥基硬脂酸等羥脂肪酸;月桂醇、油醇等脂肪族飽和及不飽和單醇;硬脂胺、油胺等脂肪族飽和及不飽和單胺;月桂酸醯胺、油酸醯胺等脂肪族飽和及不飽和單羧酸醯胺;甘油、山梨糖醇等多元醇、與脂肪族飽和或 不飽和單羧酸的部分酯等等。
相對於組成物全量,上述油性劑的摻合量係以0.01質量%以上且10質量%以下為佳。
抗氧化劑係以例如:2,6-二第三丁基-4-甲基酚、2,6-二第三丁基-4-乙基酚、2,2'-亞甲基雙(4-甲基-6-第三丁基酚)等酚系;苯基-α-萘基胺、N.N'-二苯基-對伸苯二胺等胺系為佳。就效果及經濟性等觀點,相對於組成物全量,抗氧化劑的適合摻合量係0.01質量%以上且5質量%以下。
酸捕獲劑係可舉例如:苯基環氧丙醚、烷基環氧丙醚、伸烷基二醇環氧丙醚(例如聚丙二醇二環氧丙醚)、苯基環氧丙基酯、烷基環氧丙基酯、氧化環己烯、α-烯烴氧化物、環氧化大豆油等環氧化合物。其中就相溶性的觀點,係以苯基環氧丙醚、烷基環氧丙醚、伸烷基二醇環氧丙醚、氧化環己烯、α-烯烴氧化物為佳。
再者,就效果及抑制渣質產生的觀點,相對於組成物全量,適當之摻合量係0.005質量%以上且5質量%以下。
本發明中,藉由摻合該酸捕獲劑,便可更加提升本組成物的安定性。又,藉由併用前述極壓劑與抗氧化劑,便可發揮更進一步提升安定性的效果。
金屬鈍化劑係可舉例如:N-[N',N'-二烷基(碳數3至12的烷基)胺甲基]甲苯并三唑等,前述消泡劑係可舉例如聚矽氧油、氟化聚矽氧油等。
本組成物中,40℃動黏度係以1mm2/s以上且 400mm2/s以下、較佳係3mm2/s以上且300mm2/s以下、更佳係5mm2/s以上且200mm2/s以下。
使用本組成物的冷凍機,相關前述各種冷媒與本組成物的使用量,依冷媒/本組成物的質量比計,係以99/1~10/90為佳、較佳係95/5~30/70範圍。若冷媒量少於上述範圍時,會出現冷凍能力降低,又若多於上述範圍時便會導致潤滑性能降低,因而最好避免。
本組成物適用的冷凍機(冷凍系統)係可舉例如以壓縮機、冷凝器、膨脹機構(毛細管、膨脹閥)、蒸發器為必要構成要件的冷凍系統,或者具有噴射循環的冷凍系統、或者具有乾燥裝置(乾燥劑:天然.合成沸石)的冷凍系統。前述壓縮機係可為開放型、半密閉型、密閉型任一者,密閉型馬達係AC馬達或DC馬達。又,壓縮方式係可為迴轉式、渦卷式、擺盪式或活塞式任一者。壓縮機係可為0.2kW程度的小型壓縮機、亦可為30kW程度的大型壓縮機。
再者,該冷凍系統中,系統內的水分含量係以500質量ppm以下為佳、較佳係300質量ppm以下。又,殘存空氣分壓係以13kPa以下為佳、較佳係10kPa以下、更佳係5kPa以下。
本組成物係在基油中摻合入當作添加劑用之具聯苯結構或茋結構的烴化合物,因而不會損及潤滑油組成物的熱性及化學性安定性。故,使用本發明冷凍機用潤滑油組成物的汽車空調、電動汽車空調、瓦斯熱泵、空調、冰箱、自動販賣機或展示櫃的各種熱水供給系統、及冷凍. 暖房系統冷凍機等,可長期間安定地進行冷媒漏洩檢測。本組成物在當使用對該等各種機器呈低安定性的不飽和氟龍冷媒時極為有效。
實施例
其次,利用實施例進行更詳細說明本發明,惟本發明並不僅侷限於該等例。
[實施例1~10及比較例1~5]
製備表1、2所示摻合組成的潤滑油組成物,利用以下所示熱安定性試驗進行組成物的熱.化學安定性評價。
<熱安定性試驗>
在內容積200mL熱壓鍋中填充入組成物/冷媒(30g/30g比率、組成物中的水分500質量ppm)、與由鐵、銅及鋁所構成的金屬觸媒,並封管(空氣25mL),於溫度175℃條件下保持168小時後,測定酸值。另外,酸值係根據JIS K2501所規定的「潤滑油中和試驗方法」,利用電位差法進行測定。
冷媒係使用HFO1234yf(2,3,3,3-四氟丙烯)。
所使用的基油係如下述:
PAG:聚氧化丙二醇二甲醚、100℃動黏度:9.25mm2/s
PVE:聚乙烯醚、100℃動黏度:15.97mm2/s
ECP:聚乙烯醚-聚伸烷基二醇共聚合物(莫耳比1:1)、100℃動黏度:9.56mm2/s
POE:多元醇酯、40℃動黏度:68.5mm2/s
表中的漏洩檢測劑係如下述:
漏洩檢測劑1:對雙(鄰甲基苯乙烯基)苯
漏洩檢測劑2:2,5,2''',5'''-四甲基-對聯四苯
漏洩檢測劑3:2",3,3',3'''-四甲基-1,1':4',1":4",1'''-聯四苯
漏洩檢測劑4:2-(4-第三丁基苯基)-5-(4-伸聯苯基)-1,3,4-二唑
另外,表中的其他添加劑係抗氧化劑、酸捕獲劑、氧捕捉劑、及極壓劑。
[評價結果]
由表1的結果得知,摻合入當作添加劑用之具聯苯結構或茋結構的烴化合物之潤滑油組成物、與冷媒的混合系統之實施例1~10,均係酸值幾乎不會變高,熱.化學安定性高。
另一方面,由表2的結果得知,經摻合與實施例所使用添加劑具有不同結構之添加劑的比較例1~5,酸值均偏高,得知熱.化學安定性不足。
由以上結果可理解到經添加預定添加劑的本發 明冷凍機用潤滑油組成物,即便利用於使用具不安定結構的冷媒之冷凍機,仍可長期間安定地進行冷媒之洩漏檢測。

Claims (7)

  1. 一種冷凍機用潤滑油組成物,係在基油中摻合添加劑而成者,其特徵在於:前述添加劑係具有聯苯結構或茋結構的烴化合物。
  2. 如申請專利範圍第1項之冷凍機用潤滑油組成物,其中使用該組成物的冷凍機之冷媒係飽和氟化烴化合物(飽和HFC)、二氧化碳(CO2)、碳數5以下之碳氫化合物(HC)、氨、及下述分子式(A)所示含氟有機化合物中之至少任一者:CpOqFrRs (A)(式中,R係表示Cl、Br、I或氫;p係1至6的整數,q係0至2的整數,r係1至14的整數,s係0至13的整數;但,當q為0時,p係2至6;分子中具有1個以上的碳-碳不飽和鍵)。
  3. 如申請專利範圍第2項之冷凍機用潤滑油組成物,其中前述冷媒係碳數1至3的飽和HFC、或碳-碳間具有雙鍵的碳數3之不飽和HFC。
  4. 如申請專利範圍第1項之冷凍機用潤滑油組成物,其中前述基油係選自於烷基苯、烷基萘、聚-α-烯烴、聚乙烯醚、聚伸烷基二醇、聚碳酸酯、多元醇酯、及下式(1)所示醚系化合物中之至少1種;Ra-[(ORb)n-(B)-(ORc)k]x-Rd (1)(式中,Ra、Rd分別係氫原子、碳數1至10的烷基、 碳數2至10的醯基或具有2個至6個鍵結部且碳數1至10的烴基;Rb、Rc分別係碳數2至4的伸烷基;n、k係0至20的整數;x係1至6的整數;(B)係含有3個以上之下式(2)所示單體單元的聚合部); (式中,R4、R5及R6分別係表示氫原子或碳數1至8的烴基,該等係相互可相同亦可相異;R7係表示碳數1至10的二元烴基、或碳數2至20的二價含醚鍵結氧之烴基;R8係表示氫原子、碳數1至20的烴基;m係表示平均值0至10的數值,當m為複數時,在每個構成單元係可相同亦可相異;R4至R8係在每個構成單元可相同亦可相異,又當R7O為複數時,複數R7O係可相同亦可相異;又,式(1)的k、n均為0時,式(2)中,m係1以上的整數)。
  5. 如申請專利範圍第1項之冷凍機用潤滑油組成物,其係100℃動黏度在1至50mm2/s的範圍。
  6. 如申請專利範圍第1項之冷凍機用潤滑油組成物,其係在基油中進一步摻合入選自於極壓劑、油性劑、抗氧化劑、酸捕獲劑、金屬鈍化劑及消泡劑中之至少1種添加劑。
  7. 如申請專利範圍第1至6項中任一項之冷凍機用潤滑油組成物,其係使用於開放型汽車空調、電動汽車空調、瓦斯熱泵、空調、冰箱、自動販賣機、展示櫃、熱水供 給系統、及冷凍.暖房系統等的冷凍機器。
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