Dielectric fluids are provided, the dielectric fluids comprising a mixture of polyol esters derived from a reaction of a) a polyol comprising pentaerythritol, trimethylolpropane, neopentyl glycol, or combinations thereof, and b) a mixture of fatty acid esters derived from a high oleic soybean oil co
Dielectric fluids are provided, the dielectric fluids comprising a mixture of polyol esters derived from a reaction of a) a polyol comprising pentaerythritol, trimethylolpropane, neopentyl glycol, or combinations thereof, and b) a mixture of fatty acid esters derived from a high oleic soybean oil comprising fatty acid moieties, wherein the high oleic soybean oil has a C18:1 content of greater than 65% of the fatty acid moieties in the oil, and a combined C18:2 and C18:3 content of less than 20% of the fatty acid moieties in the oil. Also provided are electrical apparatuses comprising the dielectric fluids, and processes for preparing the mixtures of polyol esters.
대표청구항▼
1. A dielectric fluid comprising: a mixture comprising polyol esters derived from a reaction of: a) a polyol comprising pentaerythritol, trimethylolpropane, neopentyl glycol, or combinations thereof; andb) a mixture of fatty acid esters derived from a high oleic soybean oil comprising fatty acid moi
1. A dielectric fluid comprising: a mixture comprising polyol esters derived from a reaction of: a) a polyol comprising pentaerythritol, trimethylolpropane, neopentyl glycol, or combinations thereof; andb) a mixture of fatty acid esters derived from a high oleic soybean oil comprising fatty acid moieties, wherein the high oleic soybean oil has i) a C18:1 content of greater than 65% of the fatty acid moieties in the oil; andii) a combined C18:2 and C18:3 content of less than 20% of the fatty acid moieties in the oil. 2. The dielectric fluid of claim 1, wherein the dielectric fluid has a flash point of greater than about 280° C. 3. The dielectric fluid of claim 2, wherein the dielectric fluid has a pour point of less than about −10° C. 4. The dielectric fluid of claim 1, wherein the dielectric fluid has a viscosity of less than about 45 cST at 40° C. and less than about 14 cST at 100° C. 5. The dielectric fluid of claim 1, wherein the dielectric fluid has a power factor of less than about 0.15% at 25° C. and less than about 5% at 100° C. 6. The dielectric fluid of claim 1, wherein the dielectric fluid has a dielectric breakdown voltage of greater than about 35 KV when measured across a 1 mm gap at 25° C. 7. The dielectric fluid of claim 1, wherein the dielectric fluid has an oil stability index of at least about 8 hours at 110° C. 8. The dielectric fluid of claim 1, further comprising at least one additive selected from the group consisting of oxidation inhibitors, corrosion inhibitors, metal deactivators, and pour point depressants. 9. The dielectric fluid of claim 1, further comprising a blending component selected from the group consisting of vegetable oil, algal oil, one or more polyol esters derived from a vegetable oil other than high oleic soybean oil, mineral oil, silicone fluids, synthetic esters, poly alpha olefins, or mixtures thereof. 10. The dielectric fluid of claim 1, wherein the polyol comprises pentaerythritol. 11. The dielectric fluid of claim 1, wherein the polyol comprises trimethylolpropane. 12. The dielectric fluid of claim 1, wherein the polyol comprises neopentyl glycol. 13. The dielectric fluid of claim 1, wherein the C18:1 content is greater than 70% of the fatty acid moieties in the oil, and the combined C18:2 and C18:3 content is less than 15% of the fatty acid moieties in the oil. 14. The dielectric fluid of claim 1, wherein the dielectric fluid meets the criteria for “Ready Biodegradation” under the conditions of the 28-day CO2 Evolution Test according to OECD Guideline 301B. 15. A process for preparing a mixture of polyol esters, the process comprising the steps of: a) providing a high oleic soybean oil comprising fatty acid moieties wherein the soybean oil comprises i) a C18:1 content of greater than 65% of the fatty acid moieties in the oil; andii) a combined C18:2 and C18:3 content of less than 20% of the fatty acid moieties in the oil;b) reacting the high oleic soybean oil with an aliphatic monoalcohol having a chain length of from 1 to 5 carbons in the presence of a first base catalyst to produce a reaction mixture comprising glycerol and a mixture of fatty acid esters;c) separating and removing the glycerol; andd) reacting the mixture of fatty acid esters with a polyol comprising pentaerythritol, trimethylolpropane, neopentyl glycol, or combinations thereof in the presence of a second base catalyst to produce a mixture of polyol esters. 16. An electrical apparatus comprising: a dielectric fluid wherein the dielectric fluid comprises a mixture comprising polyol esters derived from a reaction of: a) a polyol comprising pentaerythritol, trimethylolpropane, neopentyl glycol, or combinations thereof; andb) a mixture of fatty acid esters derived from a high oleic soybean oil comprising fatty acid moieties, wherein the high oleic soybean oil has i) a C18:1 content of greater than 65% of the fatty acid moieties in the oil; andii) a combined C18:2 and C18:3 content of less than 20% of the fatty acid moieties in the oil. 17. The electrical apparatus of claim 16, wherein the electrical apparatus is an electrical transformer, an electrical capacitor, a fluid-filled transmission line, an electrical power cable, an electrical inductor, or a high voltage switch. 18. A dielectric material impregnated with at least 10 weight percent of a dielectric fluid, wherein the dielectric material comprises a cellulosic paper, a synthetic paper, or a nonwoven web; and the dielectric fluid comprises a mixture comprising polyol esters derived from a reaction of: a) a polyol comprising pentaerythritol, trimethylolpropane, neopentyl glycol, or combinations thereof; andb) a mixture of fatty acid esters derived from a high oleic soybean oil comprising fatty acid moieties, wherein the high oleic soybean oil has i) a C18:1 content of greater than 65% of the fatty acid moieties in the oil; andii) a combined C18:2 and C18:3 content of less than 20% of the fatty acid moieties in the oil.
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