Patent ID: 6821059
Filing Date: 2004-11-23
Classification: C08G,E02B,Y10T

Abstract:
A process for forming a polyurethane geotextile composite-lined ditch or canal comprising:(1) spraying onto the ditch surface of a polyurethane-forming reaction mixture with adjustable mix viscosity comprising a) a liquid polyisocyanate having an isocyanate group content of at least 10% by weight, b) an isocyanate reactive component comprising a polyether polyol having from 2-6 hydroxyl groups and a number average molecular weight of from 250 to about 8,000 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) a catalyst for catalyzing the reaction between hydroxyl groups and isocyanate groups, d) From 0.2 to about 5.0 parts by weight per hundred parts by weight of isocyanate-reactive component b) of a viscosity adjusting component, and optionally, e) a filler; (2) applying a geotextile to the sprayed ditch surface before the mixture has fully cured in a manner such that at least a portion of the sprayed mixture will permeate the surface of the geotextile; (3) conforming the geotextile to the shape of the ditch; and (4) allowing the sprayed mixture to cure.