The synthesis of oxyethylene oxypropylene copolyethers used for quenchant was studied by using anionic ring opening polymerization, diol or triol as the starting agent and KOH as the catalyst.
研究了以KOH为催化剂，二元或三元醇为起始剂，采用阴离子开环聚合合成淬火剂用共聚醚。 结果表明：产物的分子量随起始剂和杂质量的减少而增加；
Used AgNO3 Standard solution to measure the content of mercapto heterogeneous ring compound and thioureido derivative in acid coppering gloss agent continuously by potentiometric titration.
以硝酸银标准溶液，采用电位滴定法，连续测定酸性镀铜光充剂中的巯基杂环化合物和硫脲衍生物的含量。
The resin blend includes an epoxy compound, a compound having a ring structure, and a crosslinking agent.
该树脂掺合物包括：环氧化合物、具有环状结构的化合物，及交联剂。
The attachment of a group to a central metallic agent such as iron with two valences to form a heterocyclic ring.
一种基与中心金属离子(如二价铁离子)结合，形成杂环。
Taking Shanghai Middle Ring Road project as example, the principle and effect of D-125 as a waterproof agent are described.
并以上海中环线工程为例，介绍了D-125有机硅浸渍防水剂的防水原理和防水效果。
Taking Shanghai Middle Ring Road project as example, the principle and effect of D-125 as a waterproof agent are described.
并以上海中环线工程为例，介绍了D-125有机硅浸渍防水剂的防水原理和防水效果。
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