LUBRICATING OIL FOR INNER SURFACE OF COPPER PIPE AND PRODUCTION OF COPPER PIPE USING THE SAME LUBRICATING OIL

摘要

PROBLEM TO BE SOLVED: To obtain the subject lubricating oil capable of manifesting excellent lubricity and remarkably reducing residual oils after carrying out an annealing treatment by including a hydrocarbon-based polymer having an average molecular weight within a specific range and a specified structure.;SOLUTION: This lubricating oil comprises an unhydrogenated hydrocarbon- based polymer which is a copolymer, represented by the formula, having 500-2,000 average molecular weight, consisting essentially of isobutylene and partially reacting n-butene therewith. A copper pipe with a reduced residual oil on the inner surface of the pipe can be obtained by coating the inner surface of the copper pipe with the lubricating oil, carrying out diameter reducing working, then replacing the atmosphere in the pipe of the copper pipe with hydrogen gas (preferably ≥99.99% purity) or a mixed hydrogen gas (preferably a mixed gas containing the hydrogen gas of ≥99.99% purity in a volume of 20% expressed in terms of volume ratio with a nonoxidizing gas) and performing an annealing treatment in a nonoxidizing atmosphere or a reducing atmosphere. The resultant copper pipe is useful as a copper pipe for air conditioners and freezing or refrigerating equipment and a copper pipe for heat transfer.;COPYRIGHT: (C)2000,JPO