中国塑料2024，Vol.38Issue(7)：55-61,7.DOI:10.19491/j.issn.1001-9278.2024.07.010
茂金属聚丙烯釜压发泡性能的研究
Study on autoclave foaming properties of metallocene polypropylene
沈强锋 1吕明福 2徐耀辉2
作者信息
- 1. 中石化宁波新材料研究院有限公司,浙江 宁波,315299
- 2. 中石化(北京)化工研究院有限公司,北京 100013
- 折叠
摘要
Abstract
The melting and crystallization behavior of two types of polypropylene,named as mPP and ZNPP,were stud-ied by using differential scanning calorimeter(DSC)and polarized microscope(POM),and their rheological characteris-tics were analyzed through frequency scanning and melt stretching.Autoclave foaming experiments were conducted to in-vestigate the melting crystallization behavior,foaming ratio,and cell structure of the expanded polypropylene(EPP)beads.The results indicated that ZNPP had a higher complex viscosity and more obvious shear thinning,leading to high-er molecular weight size and distribution.ZNPP exhibits higher melting strength than mPP at higher temperatures due to more intense molecular chain entanglement.However,its melt strength is similar to that of mPP at lower temperatures.The quality of the cell structure needs to be improved,when mPP is used to produce EPP beads with similar ratios to ZNPP.关键词
茂金属聚丙烯/剪切变稀/熔体强度/釜压发泡/泡孔结构Key words
metallocene polypropylene/shear thinning/melt strength/autoclave foaming/cell structure分类
化学化工引用本文复制引用
沈强锋,吕明福,徐耀辉..茂金属聚丙烯釜压发泡性能的研究[J].中国塑料,2024,38(7):55-61,7.
