FLAME RETARDANT POLYISOCYANURATE FOAM

• Main Authors: KASHIWAMOTO, Yuudai, YAMAMOTO, Shigeo
• Format: Patent
• Language: English; French; German
• Published: 28.10.2020
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

An object of the present invention is to provide a polyisocyanurate foam having excellent flame retardancy and a heat insulator and building material comprising the same. A flame retardant polyisocyanurate foam produced by curing a mixture comprising a polyol (A), a surfactant (B), a catalyst (C), a blowing agent (D), a polyisocyanate (E) and a flame retardant (F), wherein the catalyst (C) comprises a trimerization catalyst; the water content in the blowing agent (D) is less than 0.2 parts by mass based on 100 parts by mass of the total of the polyol (A) and the polyisocyanate (E); the flame retardant (F) comprises a red phosphorus-based flame retardant and aluminum hydroxide, and the volume average diameter of the aluminum hydroxide is not less than 40 μm when measured by laser diffractometry; the total content of the red phosporus-based flame retardant and the aluminum hydroxide is 6 to 36 parts by mass based on 100 parts by mass of the total of the polyol (A) and the polyisocyanate (E); and the equivalent ratio of an isocyanate group in the polyisocyanate (E) to the total active hydrogen groups contained in the polyol (A), the surfactant (B), the catalyst (C) and the blowing agent (D) (NCO/OH ratio) is more than 2.0.