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Method for inhibiting the degradation of hydrochlorofluorocarbons used as blowing agents in the production of foamed polyurethane and polyisocyanurate
Method for inhibiting the degradation of hydrochlorofluorocarbons used as blowing agents in the production of foamed polyurethane and polyisocyanurate
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机译:抑制在发泡聚氨酯和聚异氰脲酸酯生产中用作发泡剂的氢氯氟烃降解的方法
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摘要
The invention relates to a method for inhibiting the degradation by dehydrohalogenation of hydrochlorofluorocarbons, such as for example the mixture of 123 and 123a, used as foaming agents during the formation reaction of foamed polyurethanes or polyisocyanurates starting from polyols and polyisocyanates. Prior to the reaction starting, a little amount of a stabilizing substance selected from the group consisting of nitromethane, nitroethane and 1-nitropropane is added to the reaction medium.
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