Method for producing a polyurethane/geofabric composite

A method for lining a ditch, canal and/or pipe comprising:

• (1) impregnating at least one geofabric with a liquid solidifiable polyurethane composition to form a polyurethane-impregnated geofabric, the liquid solidifiable polyurethane composition being the reaction product of a mixture comprising:
• COMPONENT A:
• a liquid polyisocyanate;
• COMPONENT B:
• a first isocyanate reactive component which does not contain catalyst, optionally, further comprising:
• Bi) 0-10% by weight, based on the total weight of COMPONENT B, of one or more low molecular weight diols or triols having hydroxyl equivalent weights of from about 31 to 99;
• and Bii) 0-10% by weight, based on the total weight of COMPONENT B, of a compound containing at least two amine groups;
• and
• COMPONENT C:
• a second isocyanate reactive component which has the same equivalent weight as COMPONENT B comprising 0.01 to 1% by weight, based on the total weight of COMPONENT B and COMPONENT C, of an organo-metal catalyst, optionally, further comprising:
• Ci) 0-10% by weight, based on the total weight of COMPONENT C, of one or more low molecular weight diols or triols having hydroxyl equivalent weights of from about 31 to 99;
• and Cii) 0-10% by weight, based on the total weight of COMPONENT C, of a compound containing at least two amine groups;
• and
• wherein COMPONENT B and COMPONENT C are used in a mix ratio such that a geltime of from three to twenty minutes at a temperature between 4° C. and 50° C. is achieved;
• (2) conforming at least one polyurethane-impregnated geofabric to a surface;
• and
• (3) allowing the liquid solidifiable polyurethane composition to cure to form a polyurethane/geofabric composite.