MANUFACTURING PROCESS OF WATER-REPELLENT MEMBRANE, LIQUID TRANSPORTATION PIPING AND WATER-REPELLENT MEMBRANE

摘要

PROBLEM TO BE SOLVED: To provide the water-repellent membrane which can hold an air layer stably for a long term in the water-repellent membrane or the water-repellent membrane which can hold the air layer stably not only in the laminar flow region of small velocity but also in the turbulent flow region of big velocity. SOLUTION: The water-repellent membrane has a porosity of pores, having an average pore diameter of pores formed in the membrane not smaller than 5 nm and not larger than 50 nm, a porosity of the membrane of 15 to 50 volume%. A pore forming substance having an average particle size of not smaller than 5 nm and not larger than 50 nm is added to a composition for forming the water-repellent membrane to make the water repellent membrane composition. The obtained water repellent membrane forming composition is used to make the membrane on the surface of the base material. The membrane can be made by causing the water repellent membrane forming substance to disappear. COPYRIGHT: (C)2007,JPO&INPIT