Stabilized premix for rigid polyurethane foam

Abstract

Disclosed is a method for improving storage stability of a premix which contains water and HFE-254pc as a foaming agent. Specifically disclosed is a premix for producing a rigid polyurethane foam or apolyisocyanurate foam, which contains a polyol compound, a catalyst, a foam stabilizer, a flame retardant and a foaming agent. When the foaming agent is composed of 1,1,2,2-tetrafluoroethylmethylether (HFE-254pc), an N-substituted nitrogen-containing heterocyclic compound such as an N-substituted imidazole or an N-substituted morpholine is used as the catalyst.

Description

technical field [0001] The present invention relates to a stabilized premix for producing rigid polyurethane foam or polyisocyanurate foam, a foam using the premix, and a production method thereof. More specifically, it relates to a storage stabilizer for a premixed material using 1,1,2,2-tetrafluoroethyl methyl ether (HFE-254pc) as a blowing agent. Background technique [0002] In rigid polyurethane foam or polyisocyanurate foam, in the past as a room temperature type fluorine foaming agent, its gas thermal conductivity is small, so non-flammable monofluorotrichloromethane (CFC-11) is used, and then a Fluorodichloroethane (HCFC-141b), etc. However, due to the destruction of the stratospheric ozone layer due to the chlorine atom contained in the molecule, and the increase in the amount of ultraviolet light transmitted to the ground, it has brought adverse effects on the ecosystem. These chlorofluorocarbons (CFC) or hydrochlorofluorocarbons (HCFC) are produced and used in t...

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Problems solved by technology

[0010] As a method of maintaining the fluidity at the initial stage of foaming and improving thermal insulation performance or preventing the decomposition of the foaming agent, it is disclosed that when HFC-245fa is used as the foaming agent, the method of using an imidazole catalyst or an imidazole catalyst and a stabilizer (patent Document 9 and patent document 10), but, do not mention about when taking HFE-245pc as blowing agent, the stabilizing effect of imidazole catalyst

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