| 摘要 |
2137555 9325474 PCTABS00028 The method proposed for increasing the viscosity of water is charcterized in that, for the instantaneous production of increased-viscosity water which does not lose its viscosity characteristics on storage, a slurry is prepared containing 1-9 %, preferably 2-5 %, of high-disperse synthetic, preferably pyrogenic, silicic acid in water with only a small amount of added ethers of fatty alcohols or saccaric alcoohols or esters of fatty acids with poly(ethylene glycol) or poly(propylene glycol) with a molecular weight between 250 and 50,000, at a concentration of 0.005 to 1.5 %, poly(ethylene glycol) or poly(propylene glycol) with a molecular weight between 600 and 50,000 at a concentration of 0.05 to 1.5 %, poly(ethylenimine) at a concentration > 0.003 or poly(N-vinyl-2-pyrrolidone) at a concentration of 0.05 to 0.5 %. Characteristic of this system is its marked rheopexic properties which are shown instantaneously under the action of shear forces. Under such conditions, the viscosity increases and a stable, homogeneous terminal state is produced. The increased-viscosity water thus produced can be used as, for instance, a fire extinguishant, a carrier for crop sprays and cleaning agents or as the liquid in water beds.
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