DIELECTRIC FLUID COMPOSITIONS FOR ENHANCED THERMAL MANAGEMENT

• Main Authors: HAN SUH-JOON, DIRK B ZINKWEG, ZENON LYSENKO
• Format: Patent
• Language: English; Japanese
• Published: 16.03.2017
• Subjects: ANIMAL AND VEGETABLE OILS, FATS, FATTY SUBSTANCES AND WAXES; BASIC ELECTRIC ELEMENTS; CABLES; CANDLES; CHEMISTRY; CONDUCTORS; DETERGENTS; ELECTRICITY; FATS, OILS OR FATTY ACIDS BY CHEMICAL MODIFICATION OF FATS,OILS, OR FATTY ACIDS OBTAINED THEREFROM; FATTY ACIDS FROM FATS, OILS OR WAXES; FATTY ACIDS THEREFROM; INSULATORS; METALLURGY; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES

PROBLEM TO BE SOLVED: To provide dielectric fluids that have a desired combination of properties as well as economic viability and capability for biodegradation.SOLUTION: A dielectric fluid composition for electrical apparatus comprises a functionalized 12-hydroxy stearic acid having desirable properties including a pour point less than -30°C and a fire point greater than 250°C. It may be prepared by a process wherein 12-hydroxy methyl stearate is transesterified by reaction with a C3-C20 alcohol to form an alkyl-12-hydroxy stearate, followed by esterification thereof with a linear or branched C4-C20 carboxylic acid. This acid may be a free acid chloride, a fatty acid, a carboxylic acid anhydride, or combination thereof. The resulting functionalized 12-hydroxy stearic acid exhibits improved thermoxidative capability, low temperature flowability, and increased fire point.SELECTED DRAWING: Figure 1 【課題】所望の特性の組み合わせ並びに経済的実行可能性及び生分解能力を有する誘電性流体の提供。【解決手段】電気装置のための誘電性流体組成物は、−３０℃より低い流動点及び２５０℃より高い燃焼点を含めた望ましい特性を有する官能性１２−ヒドロキシステアリン酸を含む誘電性流体組成物。これは、１２−ヒドロキシステアリン酸メチルをＣ３〜Ｃ２０のアルコールとの反応によりエステル交換して１２−ヒドロキシステアリン酸アルキルを形成し、続いて直鎖又は分岐のＣ４〜Ｃ２０のカルボン酸でそれらをエステル化するプロセスにより調製され得る。この酸は、遊離酸塩化物、脂肪酸、カルボン酸無水物またはそれらの組み合わせであってよい。得られる官能性１２−ヒドロキシステアリン酸は、改善された熱酸化性能、低温流動性および上昇した燃焼点を示す。【選択図】図１