| 摘要 |
PURPOSE:To obtain an expanded thermal insulating material involving no problem such as decline in its physical properties for a long time and metal corrosion, also no problem in ozonosphere disruption, useful for refrigenerators, etc., by using an organic polyisocyanate, a foam stabilizer and a specific organic amine as catalytic components. CONSTITUTION:A mixture of (A) a polyol component containing >=50wt.% of a polyether polyol 300-500mgKOH/g in hydroxyl value prepared by addition polymerization of an alkylene oxide to an aromatic diamine, (B) an organic polyisocyanate, (C) a foam stabilizer, (D) a catalytic component containing, as at least one component, an organic amine catalyst blocked with a lower carboxylic acid in advance, and (E) a foaming agent containing 1,1-dichloro- fluoroethane as a component, is agitated to effect expansion, thus obtaining the objective thermal insulating material. As an additional component to this mixture, an additive having reactive chlorine group of 0.01-5 times equivatent to the amino group in the component D and boiling at 100-200 deg.C is preferably used. |
