Process for granulating powders of thermoplastic polymers under improved economic conditions
A technology for thermoplastic polymers, polymers, applied in the field of granulation of thermoplastic polymer powders under improved economic conditions, to achieve the effect of cost reduction, increase of output and increase of machine running time
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Embodiment 1
[0013] Embodiment 1 (according to the present invention)
[0014] Bimodal polyethylene is produced in suspension with hexane as the suspension medium in two reactors connected in series in the presence of a highly active Ziegler catalyst. The bimodal polyethylene has a proportion of 48% by weight of a low molecular weight homopolymer and a proportion of 52% by weight of a high molecular weight copolymer. The density of bimodal polyethylene is 0.955g / cm 3 , MFI5 is 0.35dg / min.
[0015] The powdered polyethylene was subjected to the normal drying process after leaving the reaction vessel, however, the process was stopped early, resulting in exactly 2.2% by weight of hexane remaining in the polymer powder.
[0016] This powder is introduced into an extruder and processed at constant energy input to produce pellets. Subsequently, films of 25 micron thickness were produced from these particles in a blown film process, and these films were inspected for the presence or absence of...
Embodiment 2
[0017] Embodiment 2 (comparative example)
[0018] The same polymer as in Example 1 was subjected to the normal drying process after leaving the reaction vessel, however, the process went to completion resulting in less than 0.001% by weight of hexane remaining in the polymer powder.
[0019] The powder dried in this way was introduced into the same extruder as in Example 1 and processed under virtually the same conditions to produce granules. Films of 25 micron thickness were produced from these granules on blown film equipment, and these films were subjected to the same tests as in Example 1.
[0020] number of spots
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Abstract
Description
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Application Information
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