PRODUCTION OF OPEN-CELLULAR RIGID URETHANE FOAM

• Main Authors: KUROISHI KAZUYOSHI, NAKA REIJI, GOTOU KATSUHIKO, SHIBATA KATSUO
• Format: Patent
• Language: English
• Published: 15.08.1984
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; MAKING GRANULES OR PREFORMS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

PURPOSE:To produce a rigid urethane foam which, when used with an inner box made of ABS or the like used in a refrigerator or the like, does not cause cracking, by reacting a specified polyol component with an isocyanate component in the presence of a specified reaction catalyst, a blowing agent, etc. CONSTITUTION:A rigid urethane foam is produced by reacting (A) a polyol component comprising a mixture of triethanolamine polyether and an ethylenediamine polyether with (B) an isocyanate component comprising polymethylenediphenyl diisocyanate in the presence of (C) a reaction catalyst comprising a water-soluble tertiary amine, (D) a blowing agent comprising a mixture of water and trichloromonofluoromethane, (E) a foam stabilizer comprising an organosilicone block copolymer, (F) an open-cell agent comprising glycerin, and (G) a separation stabilizer comprising a phenolic polyether. It is possible to prevent an inner box for a refrigerator or the like from being cracked by clouding at low temperatures. The adhesion to an inner box is improved and the strength of the box is improved.