| 摘要 |
PURPOSE:To obtain the title expandable composition which can fill the space among cables by its own expandability to prevent water from permeating into it, by mixing a specified polyol with a polyisocyanate, a specified surfactant and water. CONSTITUTION:A room temperature-curing expandable composition comprising a polyether-polyol or a polycarbonate-polyol (A) (usually having an OH equiva lent of about 500-1,200), a polyisocyanate (B) (e.g., tolylene diisocyanate), a fluorinated or silicone surfacant (C) [e.g., a compound of formula I (wherein Rf is a 5-10C fluoroalkyl and n is 2 or 3) or a compound of formula III] and water (D). This material can fill the space among cables so as to become water tight by virtue of its expansion pressure. The cured product forms an expanded polyurethane elastomer, can show flexibility and good mountability and is fully reduced in weight. Agent C brings about effects such as impartation of water resistance and water repellency to the material itself, an effective improvement in the waterproofness of the composition and shortening of its curing time at room temperature.
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