| 摘要 |
PURPOSE:A resin composition for forming a foam having excellent flame retardancy, high strength and low water absorptivity, containing an aqueous carbohydrate solution and/or its slurry, a phenolic resin, a reaction catalyst, a polyisocyanate and, optionally, a foam stabilizer and a flame retardant. CONSTITUTION:This composition contains 50-200pts.wt. aqueous carbohydrate solution and/or its slurry (e.g., a mixture of 55.6wt% fructose, 39.3% glucose and 5.1% oligosaccharides and a total water content of 24.5%), 5-200pts.wt. phenolic resin, 0.1-5pts.wt. reaction catalyst (e.g., dibutyltin dilaurate), 50-200 pts.wt. polyisocyanate (e.g., tolylene diisocyanate) and, optionally, foam stabilizer and 0.1-100pts.wt. flame retardant. The use of the phenolic resin in this composition contributes to decrease smoking coefficient and burning temperature and attain improved foam properties such as high strength and low water absorptivity. A sandwich structure formed by applying flame-retarding or nonburning plates or sheets to both of the surfaces of a foam of such a composition as a core is an excellent flame-retarding structure.
|
