DEVICE AND METHOD FOR MANUFACTURING EXPANDED POLYURETHANE FOAM, AND HEAT INSULATION STRUCTURE

摘要

An expanded polyurethane foam is manufactured by mixing a first composition having a polyisocyanate as the main component with an expandable second composition. The expandable second composition is prepared by mixing a main expanding agent and an auxiliary expanding agent into a second composition having a polyol as the main component, and then stored in a storage container. The boiling point of the auxiliary expanding agent is lower than that of the main expanding agent, and the auxiliary expanding agent is gaseous at normal temperature. An agent for increasing the storage pressure is filled into the storage container in a pressurized state, or the liquid layer in the storage container (expandable second composition) is sealed by an air layer. The agent for increasing the storage pressure is a gas that has lower solubility and a smaller diffusion coefficient in the second composition than the auxiliary expanding agent.