| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a water-swelling friction reducing composition not swelling in a neutral region but swelling in an alkaline region. <P>SOLUTION: This water-swelling friction reducing composition is obtained by adding 145 pts toluene and 145 pts methyl ethyl ketone (MEK) as a solvent into 346 pts vinyl acetate resin elastomer solution of a 50% concentration dissolved in acetone, and, while stirring it by a dissolver, by adding 177 pts carboxymethyl cellulose calcium (CMC-Ca), 172 pts bentonite, 5 pts rust preventive and 10 pts particulate silica, and stirring it sufficiently. The water-swelling friction reducing composition has a very small swelling ratio of 2.0 in dipping into fresh water (with pH of about 7), while having the swelling ratio of about 15 in dipping into alkali solution with pH of 14. <P>COPYRIGHT: (C)2012,JPO&INPIT |
