| 摘要 |
Composites comprise a major proportion of pieces of expanded polymer, e.g. polystyrene, a polyolefine, polybutadiene, polyisoprene or polytetrafluoroethylene, secured together by an adhesive comprising a non-foamed polyisocyanate formed from one or more isocyanate prepolymers and an aqueous alkali metal silicate solution, a proportion of said prepolymers incorporating non-ionic hydrophilic groups. Use of polystyrene is preferred. The composites are characterised by rigidity, good insulating properties economy of manufacture and fire resistance. |
