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Refrigeration oil and compositions with hydrocarbon refrigerants

专利摘要

Polyol ester lubricant compositions comprising predominately straight chain C5-10 alkylcarboxlate esters of neopentyl alcohols, for example, straight chain C5-10 alkylcarboxlate esters of one or more of trimethylol propane, pentaerythritol, di-pentaerythritol, tri-pentaerythritol or pentaerythritol oligomers, and working fluids comprising said lubricant compositions and a hydrocarbon refrigerant, suitable for heat transfer devices including refrigeration and air conditioning systems are provided. The polyol ester lubricant compositions have a kinematic viscosity at 40° C. of 22-125 cSt and a viscosity index of greater than 140, and are characterized by having very high lubricity, excellent load carrying properties and excellent low temperature properties. ......

基本信息

专利类型:
发明专利
申请/专利号:
US13/759139
申请日期:
2013-02-05
专利申请人:
["CARR DALE D","HUTTER JEFFREY A","KELLEY RICHARD","URREGO ROBERTO","HESSELL EDWARD T"]
分类号:
C09K5/04
发明/设计人:
CARR, DALE D. ， HUTTER, JEFFREY A. ， KELLEY, RICHARD ， URREGO, ROBERTO ， HESSELL, EDWARD T.
权利要求: 1. A working fluid for a heat transfer device comprising:i) a C1-6 hydrocarbon refrigerant andii) a polyol ester lubricant composition having a kinematic viscosity at 40° C. of 22-125 cSt, a viscosity index of greater than 140 and comprising a mixture of compounds of formula Iwherein n is an integer of from 1 to 12,each R is independently an alkyl carbonyl of from 5 to 10 carbon atoms,each R1 is independently selected and is either a group R or a substituent of formula II:wherein at least 80 molar % of all R groups are independently selected from straight chain alkylcarbonyls of from 7 to 10 carbon atoms, andwherein the polyol ester lubricant composition comprisesa) from about 30 to about 55 wt % of a compound of formula I wherein n is 1 and each R1 is independently selected and is a group R,b) from about 1 to about 20 wt % of a compound of formula I wherein n is 2 and each R1 is independently selected and is a group R,c) from about 1 to about 10 wt % of a compound of formula I wherein n is 3 and each R1 is independently selected and is a group R, andd) from about 25 to about 45 wt % of a compound of formula I which are pentaerythritol oligomers of 4 or more pentaerythritol monomer groups,wherein the wt % is based on the weight of all compounds of formula I present in the lubricant composition.2. The working fluid according to claim 1 wherein at least 90 molar % of all R groups are independently selected from straight chain alkylcarbonyls of 7, 8 and 10 carbon atoms.3. The working fluid according to claim 1 wherein the C1-6 hydrocarbon refrigerant is the only refrigerant present and is one or more refrigerants selected from the group consisting of ethane, propane, propene, butane, isobutane, butene, iso butene, pentane and iso-pentane.4. The working fluid according to claim 3 wherein the refrigerant is one or more refrigerants selected from the group consisting of propane, butane, isobutane, butene and iso butene.5. The working fluid according to claim 1 further comprising in addition to components i) and ii), one or more compounds selected from the group consisting of mineral oils, poly-α-olefins, alkylbenzenes, carboxylic acid esters other than a compound of formula I, polyethers, polyvinyl ethers, perfluoropolyethers, and phosphoric acid esters.6. The working fluid according to claim 1 further comprising one or more antioxidant, extreme-pressure additive, antiwear additive, friction reducing additive, defoaming agent, profoaming agent, metal deactivator, acid scavenger or mixture thereof.7. The working fluid according to claim 1, wherein the polyol ester lubricant composition comprises a mixture of compounds of formula I and C5-10 alkylcarboxlate esters of trimethylol propane wherein at least 80 molar % of all alkyl carbonyls in the esters of trimethyl polyol are independently selected from straight chain alkylcarbonyls of from 7 to 10 carbon atoms.8. The working fluid according to claim 7 wherein at least 50% by weight of all esters in the polyol ester lubricant composition are compounds of formula I.9. The working fluid according to claim 7 wherein at least 75% by weight of all esters in the polyol ester lubricant composition are compounds of formula I.10. The working fluid according to claim 1 wherein at least 90% by weight of all esters in the polyol ester lubricant composition are compounds of formula I.