| 摘要 |
PURPOSE:To obtain a uniform foam having excellent fire-preventiveness, fire resistance, processability, and dispersion without troubles such as clogging of piping, by compounding a phenolic resin of resol type, a surface active agent, a foaming agent, a curing agent, and a specified flame restardant. CONSTITUTION:Not more than 15pts.wt. (solid content) aqeous solution of ammoniumamidopolyphosphoric acid of the formula (where R is -ONH4 or -NH2; m+n=20-100 and m, n >=1) which is obtained as an intermediate in the process of preparing ammonium polyphosphate and has an average degree of polymerization of 100-150 or less, a solubility in water of 45-50%, and a concentration of 30wt% or higher, as a flame retardant, is premixed with 100pts.wt. phenolic resin of resol type which has a viscosity of 500-50,000 (at 25 deg.C), a nonvolatile matter of 65-95%, and a free HCHO of 5% or less. With this premix, a foaming agent such as a halogenated hydrocarbon having a boiling point of 40- 100 deg.C, a nonionic surface active agent, and a curing agent (e.g. a mineral acid or an organic acid) are mixed by stirring, and the mixture is caused to foam at room temperature or 40-120 deg.C to give the titled phenolic foam. |
