| 摘要 |
PURPOSE:To provide a phenolic resin foam having high flame retardance, excellent processability, physical properties, etc. and suitable for use as a ceiling material, a heat insulating material, etc., containing a phosphorus compd. and aluminum salt of a strong acid in combination as flame retarders. CONSTITUTION:A phosphorus compd. (e.g., ammonium phosphate or phosphoric acid) and aluminum salt of a strong acid having pKa<=2.5 (e.g., aluminum sulfate or aluminum chloride) are added to a phenolic resin. Further, additives such as a blowing agent, a foam stabilizer, a curing catalyst, etc. are added thereto and the mixture is expanded by heating to obtain the desired flame-retardant phenolic resin foam. Under high-temperature conditions, the phosphorus compd. is self-condensed to form water, whereby heat generation during combustion is inhibited. At the same time, the carbonization of the resin foam proceeds and a high flame retardance imparting effect can be exhibited by the synergism of the carbonization of the foam and the carbonization promoting effect of the aluminum salt of the strong acid. |
