Process for forming a ditch liner

Details Process for forming a ditch liner Process for forming a ditch liner

1994-04-07

1995-06-06

Corbin, David H.

Hydraulic and earth engineering

Earth treatment or control

Impermeabilization

405118, 405264, E02B 300

Patent

active

054216770

ABSTRACT:
The invention is directed to a process of forming a ditch liner by dispensing a solidifiable liquid mixture onto a continuously moving porous blanket, applying pressure against the mixture and the coated blanket to form a continuous matrix within the blanket, laying the resulting coated blanket into a ditch before the liquid mixture has fully cured, conforming the coated blanket to the shape of the ditch, and allowing the mixture to fully cure. The improvement resides in using a reaction mixture of a polyisocyanate, up to 60% by weight of a filler, a specified polyol mixture and, optionally, a catalyst. The polyol mixture requires three different propylene oxide adducts: i) a propylene oxide adduct of an alkanolamine, ii) a propylene oxide adduct of a low molecular weight organic compound having from 3 to 8 OH groups, and iii) a propylene oxide adduct of a low molecular weight diol. The amounts of ii) and iii) are such that the mixture of ii) and iii) has an average OH functionality of from more than 2 to less than 2.8.

REFERENCES:
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patent: 4872784 (1989-10-01), Payne
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patent: 5049006 (1991-09-01), Payne
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patent: 5145282 (1992-09-01), Payne
patent: 5160221 (1992-11-01), Rohe et al.

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