| 摘要 |
PROBLEM TO BE SOLVED: To obtain a coating material which forms a coating film excellent in adhesion to cast iron and mortar by compounding an epoxy resin which is liquid at a normal temperature and has a specified number of epoxy groups and a specified epoxy equivalent with an amine-base curative, a diluent and a body pigment. SOLUTION: This coating material comprises an epoxy resin (e.g. a bisphenol epoxy resin) which is liquid at normal temperature and has an epoxy equivalent of 170-250 and, on average, at least 1.5 epoxy groups per molecule, an amine- base curative (e.g. a modified m-xylenediamine-type curative) preferably having an active hydrogen equivalent of 90-100, a diluent (e.g. a toluene resin as a nonreactive diluent resin) and a body pigment (e.g. barium sulfate). A cast iron pipe is coated after the end face of its joint is coated with this coating material. This coating material is quickly cured to quickly develop its strengths and gives a coating film having high strengths and adhering well to a cast iron pipe and a mortar lining, thus giving excellent water-stopping properties to the end face of the pipe.
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