| 摘要 |
PURPOSE:To obtain the title composition which can prevent friction, abrasion, seizing, reduction in insulation resistance at the sliding part of a compressor and metallic corrosion such as in copper pipes by using a specific polyester or its mixture of low hygroscopicity and tetrafluoroethane. CONSTITUTION:The subject composition is obtained by using (A) a polyether of 10 to 300cst dynamic viscosity at 40 deg.C, which is at least one selected from formulas I through III [R<1> is alkylene; R<2> through R<4> are acyl, H (wherein two or more of them are not H simultaneously); X<1> is residue removing OH from a monohydroxy compound (wherein X<1> and R<2> are not H simultaneously); X<2> is residue removing OH from a trihydroxy compound ] and (B) a tetrafluoroethane preferably 1,1,1,2-tetrafluoroethane and making them compatible at any free ratio at a temperature lower than -20 deg.C and higher than 40 deg.C. |
