Rendering porous structures impermeable by treatment with pH ins

Details Rendering porous structures impermeable by treatment with pH ins Rendering porous structures impermeable by treatment with pH ins

1980-04-21

1982-12-28

Childs, Sadie L.

Coating processes

With post-treatment of coating or coating material

Heating or drying

525154, 138 97, 166295, 405264, 405270, 427136, 427140, 4273936, 524547, 524555, 524812, 524827, 525367, 525385, 525509, B05D 302

Patent

active

043661947

ABSTRACT:
Aqueous solutions of amide polymers, such as polyacrylamide when treated with small amounts of a water-soluble polyaldehyde and a hypohalite salt at an alkaline pH, react to form firm gels within a short time at ambient temperature. Such gels, which are stable under alkaline as well as acidic conditions, are usefully employed to plug porous subterranean formations, for grouting of leaking soil pipes or wells, and to otherwise render porous structures impermeable to the passage of liquids such as water.

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