An improved mist lubricant composition and an improved mist lubrication process utilizing said improved lubrication composition is disclosed. The composition contains specific synthetic esters and a mixture of polyisobutylene polymers having different molecular weights. Synthetic esters employed in the composition are polyol esters, trimellitate esters, and polymeric fatty acid esters.
A working fluid composition comprising:
(A) a heat transfer fluid comprising a mixture of at least two compounds selected from the group consisting of hydrofluoroalkanes and fluoroalkanes; and
(B) sufficient to provide lubrication of a lubricant which is at least partially soluble in each component of the heat transfer fluid.
Esters and mixtures of esters of polyhydric alcohols, e.g., of pentaerythritol, in which at least 22 number percent of the acyl groups in the esters are either branched or contain no more than six carbon atoms, are effective lubricants and/or lubricant base stocks for chlorine-free fluorocarbon refrigerant heat transfer fluids, particularly for chlorine-free heat transfer fluids such as Refrigerant 134a (1,1,1,2-tetrafluoroethane).
Esters and mixtures of esters of polyhydric alcohols, e.g., of pentaerythritol, in which at least 22 number percent of the acyl groups in the esters are either branched or contain no more than six carbon atoms, are effective lubricants and/or lubricant base stocks for chlorine-free fluorocarbon refrigerant heat transfer fluids, particularly for chlorine-free heat transfer fluids such as Refrigerant 134a (1,1,1,2-tetrafluoroethane).
Polyol ester lubricants for refrigerator compressors operating at high temperature
申请人:HENKEL CORPORATION
公开号:EP0982393A1
公开(公告)日:2000-03-01
A high quality lubricant for compressors operated during at least part of their compression cycle at temperatures above normal human comfort temperatures, such as most automotive air conditioners, especially those using chlorine free hydrofluorocarbon refrigerant working fluids, is provided by mixed esters of hindered polyols, most desirably pentaerythritol, with a mixture of carboxylic acids including at least some iso-pentanoic acid along with either or both of iso-nonanoic acid and dibasic acids such as adipic.