VACUUM SPHERULE HAVING SMALL DIAMETER AND HEAT INSULATING MATERIAL USING THE SAME

• Main Authors: HOSHINO AKIHITO, WATANABE KATSUMI
• Format: Patent
• Language: English
• Published: 09.01.1996
• Edition: 6
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; BLASTING; CHEMISTRY; COMPOSITIONS BASED THEREON; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; GENERAL PROCESSES OF COMPOUNDING; HEATING; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; JOINTS OR FITTINGS FOR PIPES; LIGHTING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; MEANS FOR THERMAL INSULATION IN GENERAL; MECHANICAL ENGINEERING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PIPES; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; THEIR PREPARATION OR CHEMICAL WORKING-UP; THERMAL INSULATION IN GENERAL; TRANSPORTING; WEAPONS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

PURPOSE:To obtain a heat insulating material of a rigid urethane roam having a low thermal conductivity and having high reliability by forming a vacuum spherule having a small diameter using an expanded bead, mixing the formed vacuum spherule in a rigid urethane expandable with water and expanding the resultant mixture. CONSTITUTION:This vacuum spherule having a small diameter is formed by deaerating a styrenic or a vinylidiene chloride-based bead expanded with propane, butane, etc., in a vacuum and then heat-sealing the surface of the resultant bead on a hot plate or a heated cylinder arranged in a vacuum. Furthermore, this heat insulating material is obtained by adding a polyol mix containing a catalyst, a foam stabilizer and water (for expansion with gaseous carbon dioxide) to a polyol and an isocyanate to the formed vacuum spherule having the small diameter, stirring and mixing the prepared mixture, expanding and curing the mixture.