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AssigneeHayward Baker Company
InventorWilliam J. Clarke
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This invention is concerned with an aqueous liquid composition comprising unsaturated monomers including (1) magnesium diacrylate and/or calcium diacrylate, (2) a polyol monoacrylate selected from hydroxyethyl acrylate and hydroxypropyl acrylate, 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 aqueous 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 tertiary amine which serves as a reducing agent, thereby providing a redox polymerization system so that when the two liquids mix, upon discharge from the head, a rapid polymerization to a polymer gel occurs at the ambient temperature.
A two-part chemical grouting composition adapted to be applied upon admixture to an earth formation to control liquid flow therethrough, one part A thereof being an aqueous 10 to 24 weight % monomer solution in which the monomers therein consist essentially of a mixture of (1) a predominant proportion of magnesium diacrylate, (2) 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 3-hydroxypropyl acrylate, or a mixture thereof, and (3) a covalent polyethylenically unsaturated monomer, the relative proportions of monomers being 8 to 10 parts by weight of (1) to 1.6 to 2.4 parts by weight of (2) to 0.25 to 0.40 part by weight of (3), part A containing triethanolamine, from 20 to 300 parts per million of potassium ferricyanide, a small but effective amount of a biocide, and a small but effective amount of methyl ether of hydroquinone stabilizer, the other part B being an aqueous solution of ammonium persulfate at a concentration to provide in the grout mixture applied to the grouting site of the earth formation at least about 0.3% by weight of ammonium persulfate, about 10 to 12 weight % of monomers, and a concentration of triethanolamine of at least about 0.3% by weight.
A two-part chemical grouting composition adapted to be applied inside a waste or sewer conduit to seal leaky joints or cracks therein by means of equipment of a type having a packer unit movable to successive leaky joints or cracks in the conduit, one part A being an aqueous 20 to 24 weight % monomer solution in which the monomers therein consist essentially of a mixture of (1) a predominant proportion of magnesium diacrylate, (2) 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 3-hydroxypropyl acrylate, or a mixture thereof, and (3) a covalent polyethylenically unsaturated monomer, the relative proportions of monomers being 8 to 10 parts by weight of (1) to 1.6-2.4 parts by weight of (2) to 0.25-0.40 parts by weight of (3), part A also containing about 0.3 to 4% by weight of triethanolamine, a small but effective amount of a biocide, and a small but effective amount of methyl ether of hydroquinone stabilizer, the other part B being an aqueous solution of 0.3 to 6% by weight of ammonium persulfate;
Dependencies are inferred from the claim text.