Liquid Silicone Rubber Foams Made with Water as Blowing Agent,Advanced Engineering Materials

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Liquid Silicone Rubber Foams Made with Water as Blowing Agent
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2021-08-18 , DOI: 10.1002/adem.202100382
Svenja Marl ₁ , Annette Rüppel ₁ , Michael Hartung ₁ , Kevin Klier ₁ , Ralf-Urs Giesen ₁ , Hans-Peter Heim ₁

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Liquid silicone rubber (LSR) is primarily used in injection molding. Foamed molded parts made of LSR are almost nonexistent because the process reliability of LSR foam injection molding is currently not given. It makes sense to have suitable foaming processes for this material as well, because the density of this elastomer is about 1.15 g cm⁻³. With the injection molding process presented herein for foaming LSR, density reductions of up to 40% can be achieved. In this process, up to 3% by weight of water is added to the material. In addition, the hardness of the component changes, it becomes softer. Especially in the case of hardness, the process parameter mold temperature has a decisive influence, as it determines the pore size in the component. Herein, the structural properties of the silicone foam are now discussed as a function of the process parameters and additives for foaming. Thus, with the new process, material can be saved, the haptic properties of components can be changed, and a stable processing method for foamed components made of LSR is found.

中文翻译：

以水为发泡剂的液态硅橡胶泡沫

液态硅橡胶（LSR）主要用于注塑成型。由 LSR 制成的发泡成型部件几乎不存在，因为目前没有给出 LSR 泡沫注塑成型的工艺可靠性。对这种材料采用合适的发泡工艺也很有意义，因为这种弹性体的密度约为 1.15 g cm ^-3. 使用本文介绍的用于发泡 LSR 的注塑工艺，可以实现高达 40% 的密度降低。在此过程中，最多向材料中添加按重量计 3% 的水。此外，组件的硬度发生变化，它变得更软。特别是在硬度的情况下，工艺参数模具温度具有决定性影响，因为它决定了部件的孔径。在此，现在讨论有机硅泡沫的结构特性作为发泡的工艺参数和添加剂的函数。因此，通过新工艺，可以节省材料，改变部件的触觉特性，为LSR制成的发泡部件找到稳定的加工方法。

更新日期：2021-08-18

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