季铵化合物

Efficient conversion of pentaerythrite with carbonyl compounds,aldehyde or ketone,to the corresponding pentaerythritol dialdehyde or diketone compounds in the presence of ammonium hydrogen sulfate under microwave irradiation without solvent was described.

无溶剂微波照射下，通过硫酸氢铵催化季戊四醇和醛、酮反应合成了季戊四醇双缩醛、酮化合物。通过IR和1HNMR对产物结构进行了表征，研究了反应条件对产率的影响，最佳反应条件为微波照射功率750 W，照射时间1.5 min

ACQ-DB is a water-based wood preservative that contains copper and Quaternary Ammonium Salts and boron-containing compounds.

ACQ-DB 是一种水溶性木材防腐剂，其主要活性成分包含铜、季铵盐、硼化合物。

The results show that with the content of the synthetic compound increasing, the surface resistivity of PVC materials was decreased.

合成了一种长链季铵盐类化合物，将其用作抗静电剂添加到软质聚氯乙烯材料中，测试了材料的表面电阻、力学性能，并采用扫描电子显微镜测试研究了其结构。

A quaternary ammonium salt compound with a long chain of 12 carbon atoms was synthesized and used as an antistatic agent to be added into plasticized poly, and the structure and properties of such PVC materials were studied by surface resistivity, mechanical property and scanning electronic microscope tests.

合成了一种长链季铵盐类化合物，将其用作抗静电剂添加到软质聚氯乙烯材料中，测试了材料的表面电阻、力学性能，并采用扫描电子显微镜测试研究了其结构。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。