| 摘要 |
PURPOSE:To make the flash point 250 deg.C or higher and the pour point lower than -30 deg.C by using a specific fatty acid ester of dipentaerythritol alone or a mixture of the fatty acid ester and a specific fatty acid ester of another neopentylpolyol. CONSTITUTION:As an ester used for an electric insulator oil, an ester of A component alone consisting of dipentaerythritol and a fatty acid with carbon number 7 to 12, or an ester of a mixture of the ester of the A component and an ester of B component which consists of another neopentylpolyol and the fatty acid with carbon number 7 to 10 is used. And as the neopentylpolyol, pentaerythritol or trimethylol propane is used, and the ratio of the A component occupying in the said mixture is made 50 % or larger. In such a composition, the flash point can be made 250 deg.C or higher and the pour point can be made lower than -30 deg.C. And an electric insulating oil with an excellent flame-resisting and electric property, and with no fear of contaminating the environment can be obtained.
|
