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Surface-Treated Mica Minerals for Polyamide 6
Muscovite and phlogopite micas are commonly used in polyamide 6 because of their equilibrated mechanical behavior but even more due to their ability to reduce isotropically the shrinkage of the compound as well as increasing the HDT - both resulting in extremely low warping materials (Zilles 2006). This is one of the prerequisites for using PA6 compounds as functional parts in environments being subjected to high temperature changes. HDT As typically are in the region of 120-140 °C at 20% filler load (65 °C on the unfilled PA6). Tables 4 and 5 summarize the behavior of a series of surface-treated Aspanger mica and TREFIL™ phlogopite mica products in polyamide 6 at 20% filler load. All results were obtained on the “dry” injection mold parts.
Advantages of using phlogopite mica of the TREFIL™ type at 20% filler load compared to the unfilled polymer are:
An increase of up to 4% in tensile strength
Advantages of using Aspanger muscovite mica at 20% filler load compared in polyamide to the unfilled polymer are:
Muscovite and phlogopite show clear increase of mechanical and thermal properties of polypropylene copolymers and polyamide 6. Whenever equilibrated mechanical behavior (stiffness/brittleness ratio) and isotropic behavior resulting in low warpage are a concern, they show clear advantages in comparison to, e.g., talc or to some extent even glass fibers. Especially in car industry, these mica types will make polymer compounds of PA and PBT available being used in thermal shock environment and high temperature ranges. Whenever scratch resistance and low warpage are a concern, mica shows clear advantages over talc or non-isotropic fillers in polypropylene.
Table 4 Properties of phlogopite mica products at 20% filler load in PA6
Table 5 Properties of surface-treated Aspanger mica products at 20% filler load in PA6
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