| 摘要 |
PROBLEM TO BE SOLVED: To obtain a powder coating composition which can exhibit excellent primary rust-preventive effect without detriment to the workability of the composition by mixing an epoxy resin with a curing agent and a zinc powder in a specified ratio. SOLUTION: 100 pts.wt., in total, epoxy resin and curing agent is mixed with 100-900 pts.wt. zinc powder. The epoxy resin used is not particularly limited so far as it is one that can be used in a powder coating composition and may be selected among various epoxy resins. Especially, a bisphenol-F-based one is desirable in respect that it has low internal stress during curing and a low melt viscosity. The curing agent used is not particularly limited so far as it can be used in an epoxy resin containing a powder coating composition. It is desirable that the zinc powder has a mean particle diameter of primary particles of 0.7-20μm. It is not particularly limited in shape and may be spherical or flaky, but it is particularly desirably flaky.
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