摘要 |
<p>Disclosed is a composition for insulating oils, which has high biodegradability, stability and low-temperature fluidity at the same time. The composition for insulating oils contains a fatty acid ester, and the total of an ester of a monoene unsaturated fatty acid having 18 carbon atoms (hereinafter referred to as 'fatty acid A'), an ester of a diene unsaturated fatty acid having 18 carbon atoms (hereinafter referred to as 'fatty acid B') and an ester of a resin acid is not less than 75% by weight in 100% by weight of the fatty acid ester. When the total of the fatty acid ester is taken as 100% by weight, the content ratios of the ester of the fatty acid A, the ester of the fatty acid B and the ester of the resin acid are respectively, 25-70% by weight, 20-60% by weight and 0.1-15% by weight.</p> |