| 摘要 |
Freon stable heat transfer oil comprising polyol ester containing tris-(alkylphenyl) phosphite and benzotriazole <IMAGE> or benzotriazole derivative <IMAGE> in which R1 and R2 each represents a hydrogen atom or an alkyl group. It is desirable to add tris-(alkylphenyl) phosphite or tris-(phenyl) phosphite in an amount in the range between 0.02-5% by weight and to add benzotriazole or its derivative in an amount in the range between 0.02-1% by weight to the heat transfer oil. |
