化学复合山梨醇缩醛成核剂的合成及应用

Synthesis and application of chemical-compound sorbitol acetal nucleating agents

合成了化学复合山梨醇缩醛类成核剂。利用X射线衍射仪和傅里叶变换红外光谱仪分别表征了成核剂的晶体结构和分子结构。熔点测试发现,化学复合成核剂的熔点低于任一单一醛合成的成核剂,而略高于同比例的物理复合成核剂。6元环或5元环的存在是环状缩醛类成核剂得以稳定的原因。在聚丙烯中添加成核剂的研究表明,化学复合成核剂具有与第3代成核剂相当的成核效果,完全可以取代第3代成核剂。

Chemical-compound sorbitol acetal nucleating agents were synthesized. Their crystal and molecular structures were characterized by X-ray diffractometer（XRD） and Fourier transform infrared spectroscopy （FTIR） respectively. The melting points of the chemical-compounds are lower than that of any nucleating agent manufactured by single-aldehyde, but slightly higher than those of corresponding physical-compounds. Hexatomic or pentatomic ring existing in sorbitol acetals are responsible for the stability of this kind of nucleating agents. The application experiments of the nucleating agents used in polypropylene （PP） show that the chemical-compounds have equivalent performances to the third generation nucleating agent, and the fomer can fully replace the letter.