| 摘要 |
PROBLEM TO BE SOLVED: To provide properties capable of withstanding a long-term use even in a metal corrosive liquid by providing an cylindrical vinylester resin layer, which is made of a material excellent in heat conductivity and contains carbon fiber on a surface at least contacting with the metal corrosive liquid. SOLUTION: A carbon fiber reinforced resin essentially consisting of a vinylester resin and carbon fiber as main components is laminated on the inner surface and/or outer surface of a metal pipe. The metal having a heat conductivity of 100-450 w/mK is used, and, more particularly, may be copper, aluminum, and an alloy thereof. Acid is normally used for the metal corrosive liquid where a heat exchanging annular body, and more particularly, hydrochloric acid, sulfuric acid, nitric acid and a mixed acid thereof or the like may be used. As a vinylester resin, an epoxy acrylate resin may be used, which is normally obtained by the reaction between an epoxy resin and an unsaturated nonobasic acid. An example of the unsaturated monobasic acid may be an acrylic acid, a methacrylic acid or the like.
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