| 摘要 |
PURPOSE: A shaped pipe is provided to improve the endurance and erosion-proof characteristic of the shaped pipe by coating triple-layered epoxy polyethylene having a thermal expansion coefficient identical to the thermal expansion coefficient of the shaped pipe. CONSTITUTION: An epoxy layer(11), an adhesive layer(12), and a polyethylene layer(13) are sequentially coated on an outer surface of a shaped pipe(10). The epoxy layer(11) has a thickness of 50-100 micrometer, the adhesive layer(12) has a thickness of 100-200 micrometer, and the polyethylene layer(13) has a thickness of 2000-3000 micrometer. The epoxy layer(11) has a thermal expansion coefficient identical to the thermal expansion coefficient of the shaped pipe(10). When the shaped pipe(10) is shrunken by the external temperature, the epoxy layer(11) is shrunken together with the shaped pipe(10), so the shaped pipe(10) is not spaced from the epoxy layer(11).
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