Hydraulic and earth engineering – Earth treatment or control – Chemical
Patent
1980-03-24
1982-01-26
Leppink, James A.
Hydraulic and earth engineering
Earth treatment or control
Chemical
138 97, 166295, 405155, E02D 312, E02D 2910, E21B 33138
Patent
active
043126057
ABSTRACT:
This invention is concerned with a method of grouting sewer conduits by using an aqueous liquid composition comprising unsaturated monomers including (1) magnesium diacrylate, (2) an alkali metal (sodium or potassium) monoacrylate in a weight ratio of (1):(2) from about 90:10 to about 70:30, and (3) a polyethylenically unsaturated monomer copolymerizable with (1) and (2) to produce covalent cross-linking bonds in the copolymer besides the ionizable magnesium bonds. The weight ratio of (3) to the sum of (1) and (2) is in the range of about 3:97 to about 5:95. Examples of monomers that can be used as part or all of component (3) include N,N'-methylene-bis-acrylamide and ethylene glycol diacrylate. The relative proportions between the several monomers are selected to provide on polymerization a cross-linked vinyl addition polymer gel containing both covalent (non-ionic) cross-linking bonds and ionic cross-linking bonds and the relative proportions between the several components are predetermined to render the composition suitable for application by conventional mixing packer equipment hereinafter described. In such equipment, means is provided to direct a second aquoeus solution or suspension containing a water-soluble free radical initiator, such as a persulfate or peroxide, separately but concurrently with the first monomer-containing solution to a common distributor head of the movable packer positioned in the sewer conduit adjacent the joint or crack to be repaired. The monomer solution is provided with a polymerization catalyst, so that when the two liquids mix, upon discharge from the head, a rapid polymerization to a polymer gel occurs at the ambient temperature.
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AM-9 Chemical Grout, American Cyanamid Co. Publication No. EN 111A, 5/75.
AM-9 Plus, American Cyanamid Co. Publication No. EN-115, 5/75.
Infiltration Control with AM-9 Chemical Grout, American Cyanamid Publication No. ENT-15, 6/77.
All about Cyanamid AM-9 Chemical Grout, American Cyanamid Publication No. EN-4, 10/75.
Hayward Baker Company
Leppink James A.
Suchfield George A.
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