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

讨论了用二烷替代一氟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.

通过对其酰化析,选用乙酰作酰化剂、二烷作酰化溶剂,测定含环氧基聚酯的羟值。