Flame-retardant rigid polyurethane foam
AssigneeSekisui Chemical Co., Ltd.
InventorsKazuhiro Okada, Tomonori Kajita, Yozo Toei
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Abstract
A flame-retardant rigid polyurethane foam contains a flame retardant, the foam having a ratio of the maximum peak intensity ratio (P1) of the foam after moist heat treatment of the foam for one week at a temperature of 80° C. and a humidity of 85% to the maximum peak intensity ratio (P2) of the foam before this moist heat treatment of 85% or more (P1/P2x100). The P1 and P2 each refer to the ratio of the maximum peak intensity of 1390 to 1430 cm−1 to the maximum peak intensity of 1500 to 1520 cm−1 when the infrared absorption spectrum is measured at a position 5 to 10 mm from the surface of the foam, and the average intensity of 1900 to 2000 cm−1 is adjusted to zero.
Claims10
A flame-retardant rigid polyurethane foam comprising a urethane resin, a flame retardant, trimerization catalysts, and a catalyst other than the trimerization catalysts,
- the catalyst other than the trimerization catalysts comprising 1,2-dimethylimidazole, and
- the trimerization catalysts comprising a quaternary ammonium salt and a carboxylic acid potassium salt, wherein the quaternary ammonium salt is tetramethyl ammonium salt, tetraethyl ammonium salt, tetraphenyl ammonium salt, or triethylmethyl ammonium salt,
- the foam having a ratio of the maximum peak intensity ratio P1 after moist heat treatment of the foam for one week at a temperature of 80° C. and a humidity of 85% to the maximum peak intensity ratio P2 of the foam before the moist heat treatment of 85% or more, as calculated by the equation P1/P2×100,
- P1 and P2 each referring to a ratio of the maximum peak intensity of 1390 to 1430 cm−1 to the maximum peak intensity of 1500 to 1520 cm−1 when an infrared absorption spectrum is measured at a position 5 to 10 mm from the surface of the foam, and the average intensity of 1900 to 2000 cm−1 is adjusted to zero.
A foamable polyurethane resin composition comprising
- a polyol,
- a polyisocyanate,
- a foam stabilizer,
- a foaming agent,
- a flame retardant, and
- trimerization catalysts and a catalyst other than the trimerization catalysts, the catalyst other than the trimerization catalysts including 1,2-dimethylimidazole, and the trimerization catalysts including a quaternary ammonium salt and a carboxylic acid potassium salt, wherein the quaternary ammonium salt is tetramethyl ammonium salt, tetraethyl ammonium salt, tetraphenyl ammonium salt, or triethylmethyl ammonium salt,
- the foamable polyurethane resin composition comprising, based on 100 parts by weight of a urethane resin prepared from the polyisocyanate compound and the polyol compound,
- 0.6 to 10 parts by weight of the trimerization catalysts, and
- 3 parts by weight or less of the catalyst other than the trimerization catalysts.
Dependencies are inferred from the claim text.