This article is a study of methylene chloride as a substitute for trichloro-fluoromethane in producing flexible polyurethane foam.

讨用甲烷替代一氟三甲烷进行软质聚氨酯泡沫料的生产。

The hydroxyl value of epoxy-containing polyester was determined by analyzing acetification principle and using acetyl chloride as acetifier and methylene chloride as solvent.

通过对其酰化原理分析,选用乙酰作酰化、甲烷作酰化溶,测定含环氧基聚酯的羟值。