| 摘要 |
A refrigerator oil compsn. for hydrofluorocarbon refrigerants comprises (A) a polyoxyalkylene glycol deriv. and/or (B) a polyester cpd. and (a) a polyalcohol partial fatty acid ester (0.1-10 wt.%) and/or (b) a phosphate cpd. and/or a phosphite cpd. (0.1-5 wt.%). (B) has a dynamic viscosity of 5-1000 cSt at 40 deg.C and has at least two ester bondings. (A) is represented by general formulae R1-O-(R2O)m-R3 (I) and/or (II), where R1, R3, R5, R7 and R9 are independently H, 1-20C alkyl gp., 2-20C alkenyl gp., 2-20C alkynyl gp., 1-20C acyl gp., 6-20C cycloalkyl gp.; R2, R4, R6 and R8 are independently 2-4C alkylene gp.; m = 3-100; n, p and r are positive and n+p+r is 3-100. (B) can be a reaction prod. of (i) a polyvalent carboxylic acid or its deriv., (ii) a polyalcohol or its deriv. and (iii) a monovalent fatty acid or its deriv. (B) can also be a reaction prod. of (i), (ii) and (iv) a monovalent fatty alcohol or its deriv. of (ii) and (iii), or of (iv) and (i). (ii) has a 3-18C branched alkyl gp. |
