PURPOSE: To provide the titled mud leakage inhibitor having improved resistance to electrolyte, consisting of a water-insoluble, water-absorbing resin, a water-soluble high-molecular compd. and an inert org. liquid.
CONSTITUTION: 5W65wt% mixture of a water-insoluble water-absorbing resin (A) (e.g. a hydrolyzate of a starch/acrylonitrile graft copolymer) and a water-soluble high-molecular compd. (B) (e.g. hydroxyethylcellulose) in a ratio of 1:0.1W10, is mixed with 95W35wt% inert org. liquid (C) (e.g. polyethylene glycol) which is a liquid at a temp. of -10W50°C, neither swells nor dissolves component A and is non-reactive with component A, thus obtaining a mud leakage inhibitor. The mud leakage inhibitor is slurried, and introduced through the emergency inlet of a shield machine into the mixing chamber thereof under pressure and then into soil, whereby the inhibitor absorbs water, swells and is caused to gel.
SAKAGAMI KUNIO
YAMAMOTO MANABU
| JPS5826191A | 1983-02-16 |