Preparation of Microcellular Injection-Molded Foams Using Different Types of Low-Pressure Gases via a New Foam Injection Molding Technology,Industrial & Engineering Chemistry Research

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Preparation of Microcellular Injection-Molded Foams Using Different Types of Low-Pressure Gases via a New Foam Injection Molding Technology
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2019-09-09 , DOI: 10.1021/acs.iecr.9b03330
Long Wang ₁ , Yuma Wakatsuki ₁ , Yuta Hikima ₁ , Masahiro Ohshima ₁ , Atsushi Yusa ₂ , Hiromasa Uezono ₃ , Akihiro Naitou ₃

Affiliation

A new foam injection molding (FIM) machine was recently developed with a physical blowing agent directly delivered from its gas cylinder, while the supercritical fluid pumping unit is a must in the conventional FIM process. Herein, different types of gases including nitrogen (N₂), helium (He), carbon dioxide (CO₂), and argon (Ar) were used as the physical blowing agents for preparing polypropylene (PP) foams with a low pressure less than 5 MPa. It is revealed that CO₂ and Ar endowed PP foams with higher cell densities, smaller cell sizes, and larger expansion ratios. In contrast, the poorest cellular structure was obtained for PP foams with He. Moreover, the effect of the gas type on mechanical properties of the resulting foams was investigated. Our findings demonstrated that the final cellular structures and mechanical performances of PP foams could be tailored by controlling the type of foaming agent, and this process could certainly be applied for other polymers.

中文翻译：

通过新型泡沫注射成型技术，使用不同类型的低压气体制备微孔注射成型泡沫

最近开发了一种新的泡沫注射成型（FIM）机器，其气瓶直接输送了物理发泡剂，而在传统的FIM工艺中，超临界流体泵送单元是必不可少的。在此，使用包括氮气（N ₂），氦气（He），二氧化碳（CO ₂）和氩气（Ar）在内的不同类型的气体作为物理发泡剂，以制备低压（小于）的聚丙烯（PP）泡沫。 5兆帕据透露，CO ₂和Ar赋予PP泡沫更高的泡孔密度，更小的泡孔尺寸和更大的膨胀比。相比之下，含He的PP泡沫获得的最差的泡孔结构。此外，研究了气体类型对所得泡沫的机械性能的影响。我们的发现表明，可以通过控制发泡剂的类型来调整PP泡沫的最终泡孔结构和机械性能，并且该方法当然可以应用于其他聚合物。

更新日期：2019-09-10

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