Process for patching canals and ditches with a non-sagging polyurethane composition
AssigneeBayer MaterialScience AG
InventorsPeter H. Markusch, Ralf Guether
Life of this patent
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Abstract
Seams are sealed and surface defects are repaired in a polyurethane/geotextile composite applied over concrete, an earthen canal or a ditch with a non-sagging polyurethane composition. This non-sagging polyurethane composition is a reaction product of a polyisocyanate, a high molecular weight polyhydroxyl compound, and a compound containing at least two amino groups. A low molecular weight diol or triol, a catalyst and a filler are optionally included in the polyurethane-forming reaction mixture.
Claims47
A process for sealing a polyurethane/geotextile composite in a canal or ditch, comprising dispensing a non-sagging polyurethane composition onto a seam of a polyurethane/geotextile composite and allowing the composition to cure, the non-sagging polyurethane composition comprising a reaction product of a mixture comprising:
- a) a liquid polyisocyanate component;
- b) 80-98% by weight, based on total weight of b) and c), of a liquid high molecular weight isocyanate reactive component comprising one or more hydroxyl group containing compounds having from about 2 to about 6 hydroxyl groups and a number average molecular weight of at least 250 and, 0-10% by weight, based on total weight of b), of a low molecular weight diol or triol having a hydroxy equivalent weight of from about 31 to 99;
- c) 2-20% by weight, based on total weight of b) and c, of an isocyanate reactive compound containing at least two amine groups;
- optionally,
- d) one or more fillers in an amount of up to 80% by weight, based upon the total weight of the non-sagging polyurethane composition;
- and
- optionally,
- e) a catalyst.
A process for patching a polyurethane/geotextile composite in a canal or a ditch comprising dispensing a non-sagging polyurethane composition onto a tear, rip and/or other abrasion on a polyurethane/geotextile composite and allowing the composition to cure, the non-sagging polyurethane composition comprising a reaction product of a mixture comprising:
- a) a liquid polyisocyanate component;
- b) 80-98% by weight, based on total weight of b) and c), of a liquid high molecular weight isocyanate reactive component comprising one or more hydroxyl group containing compounds having from about 2 to about 6 hydroxyl groups and a number average molecular weight of at least 250 and, 0-10% by weight based on total weight of b), of a low molecular weight diol or triol having a hydroxy equivalent weight of from about 31 to 99;
- c) 2-20% by weight, based on total weight of b) and c, of an isocyanate-reactive compound containing at least two amine groups;
- optionally,
- d) one or more fillers in an amount of up to 80% by weight based upon the total weight of the non-sagging polyurethane composition;
- and
- optionally,
- e) a catalyst.
A process for repairing loose and/or damaged concrete in a canal or a ditch comprising dispensing a non-sagging polyurethane composition onto a piece of or in between two or more pieces of concrete, rejoining the damaged or loose concrete with other pieces of concrete and/or a surface and allowing the composition to cure, the non-sagging polyurethane composition comprising a reaction product of a mixture comprising:
- a) a liquid polyisocyanate component;
- b) 80-98% by weight, based on total weight of b) and c) of a liquid high molecular weight isocyanate reactive component comprising one or more hydroxyl group containing compounds having from about 2 to about 6 hydroxyl groups and a number average molecular weight of at least 250 and, 0-10% by weight, based on total weight of b), of a low molecular weight diol or triol having a hydroxy equivalent weight of from about 31 to 99;
- c) 2-20% by weight, based on total weight of b) and c) of an isocyanate reactive compound containing at least two amine groups;
- optionally
- d) one or more fillers in an amount of up to 80% by weight, based upon the total weight of the non-sagging polyurethane composition;
- and
- optionally
- e) a catalyst.
A ditch or canal lined with a polyurethane/geotextile composite wherein the integrity of the canal and/or ditch has been maintained with a non-sagging polyurethane composition, the non-sagging polyurethane composition comprising a reaction product of a mixture comprising:
- a) a liquid polyisocyanate component;
- b) 80-98% by weight, based on total weight of b) and c), of a liquid high molecular weight isocyanate-reactive component comprising one or more hydroxyl group containing compounds having from about 2 to about 6 hydroxyl groups and a number average molecular weight of at least 250 and, 0-10% by weight, based on total weight of b) of a low molecular weight diol or triol having a hydroxy equivalent weight of from about 31 to 99;
- c) 2-20% by weight, based on total weight of b) and c) of an isocyanate reactive compound containing at least two amine groups;
- optionally,
- d) one or more fillers in an amount of up to 80% by weight based upon the total weight of the non-sagging polyurethane composition;
- and
- optionally,
- e) a catalyst.
Dependencies are inferred from the claim text.