Difference between zinc stearate specifically used for non-woven fabric masterbatch particles and zinc stearate meeting national standards
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Recently, I have been working on a project related to zinc stearate specifically designed for use in non-woven fabric filling masterbatch particles. I found that there is a significant difference between zinc stearate that meets national standards and the specialized version used in this application: the former has a higher torque value, resulting in higher current consumption in the extruder； The preliminary test results for the two types of zinc stearate were roughly similar (zinc content, melting range, ash content) ； It’s impossible to identify the differences between the two types of zinc stearate
Is it caused by different magnifications?
It shouldn’t be; the zinc stearate that meets national standards is in the form of white flakes, while the specialized zinc stearate appears as white beads. The particle size of both types of zinc stearate is not very high
Is it because the melting was incomplete? The two have different shapes and sizes.
It shouldn’t be the case. Just now, through a comparison of yellowing resistance at 220 degrees Celsius for 2 hours, the color of the two samples was completely different. The zinc stearate that meets national standards is yellow in color, appears transparent, and does not stick to utensils, whereas the specialized zinc stearate is whiter with a slight yellow tint, lacks transparency, and sticks to utensils. I speculate that very few additives may have been added to improve its lubricating properties and yellowing resistance
Fumbling in the darkness, still unable to find a clear direction: dizzy:
It is possible; adding paraffin improves lubricity, while adding heat stabilizers enhances heat resistance. But it should not cause a significant increase in the melting temperature, which in turn would lead to an increase in the extrusion torque.
It is possible; adding paraffin improves lubricity, while adding heat stabilizers enhances heat resistance. But it should not cause a significant increase in the melting temperature, which in turn would lead to an increase in the extrusion torque.
It is possible; adding paraffin improves lubricity, while adding heat stabilizers enhances heat resistance. But it should not cause a significant increase in the melting temperature, which in turn would lead to an increase in the extrusion torque.
Paraffin and zinc stearate seem to be incompatible; layering occurs easily. Moreover, paraffin has a low melting point, and its addition would lower the material’s initial melting point, so it probably isn’t suitable