用热塑性可膨胀微球发泡的液态硅橡胶。

Marl Svenja, Giesen Ralf-Urs, Heim Hans-Peter

Institut Für Werkstofftechnik-Kunststofftechnik, University of Kassel, 34125 Kassel, Germany.

Materials (Basel). 2022 May 25;15(11):3779. doi: 10.3390/ma15113779.

To reduce the material costs as well as the density of Liquid Silicone Rubber (LSR), LSR foams can be produced in an injection molding process. Expandable thermoplastic microspheres can be used as blowing agents. This publication deals with the analysis of the cell structure of these LSR foams. For this purpose, cylindrical disks are injection molded and examined for their cell structure as a function of different proportions of microspheres using a scanning electron spectroscope. In addition, the density of the samples is determined. It was found that a very homogeneous cell structure is produced in this process, that heat transport has a significant influence on the expansion of the microspheres, and that the formation of a filler network limits the expansion at higher proportions of blowing agent.

为降低液态硅橡胶（LSR）的材料成本以及密度，可在注塑工艺中生产LSR泡沫。可膨胀热塑性微球可用作发泡剂。本出版物涉及对这些LSR泡沫泡孔结构的分析。为此，注塑成型圆柱形圆盘，并使用扫描电子光谱仪根据微球的不同比例检查其泡孔结构。此外，还测定了样品的密度。结果发现，在此过程中产生了非常均匀的泡孔结构，热传递对微球的膨胀有显著影响，并且在发泡剂比例较高时，填料网络的形成限制了膨胀。