| 摘要 |
<p>A composition for use as a heat transfer fluid, hydraulic fluid or lubricant comprises at least one diphenoxybenzene and at least one mono- or di-phenoxydiphenyl. The diphenoxybenzene may be the meta- or para-isomer or a mixture thereof alone or containing the orthoisomer. The mono- or di-phenoxydiphenyl may be 2-phenoxydiphenyl, 4-phenoxydiphenyl, 2,21-diphenoxydiphenyl or a mixture thereof. The composition preferably comprises 1 to 60 parts by weight of diphenoxybenzene and the balance to 100 parts of diphenoxydiphenyl and may also contain ortho- and/or meta-terphenyl in amount up to 40 parts per 100 parts of the other components. The compositions of the invention remain liquid and thermally stable between 0 DEG C. and 375 DEG C.ALSO:Diphenoxybenzenes and mono- and di-phenoxydiphenyls are prepared by reacting an alkali metal phenoxide with the corresponding di-chlorobenzenes or the mono- or di-chlorodiphenyls at 280-320 DEG C. in the presence of copper as catalyst.</p> |
