Simulation analysis of mixing effect of inorganic particles in polymer microlayer⁃stacking extrusion process

doi:10.19491/j.issn.1001-9278.2024.11.012

Abstract

Abstract:

Based on the torsional micro⁃nano stacking method with the state proprietary intellectual property rights， the dispersive regulation of inorganic particles by micro⁃nano stacking units was analyzed using a particle tracer technology， and it was compared with the twin⁃screw mixing effect under the same flow field. The results indicated that the micro⁃nano laminated element used in this study had a strong shear stress in the flow channel because of its unique torsional structure. Under the same conditions， the average shear stress was dozens of times as much as that of the twin⁃screw mixing. The outlet particle size of the micro⁃nano laminated unit had a larger proportion in the small size area， and its peak density was 0.09， which was 0.07 higher than that of the twin⁃screw mixing. Based on these characterization results， the used micro⁃nano stacked units exhibited a strong ability to disperse and regulate inorganic particles， resulting in better dispersion and mixing of particles in the polymer matrix. The mixing effect of inorganic particles and polymer melt by micro⁃nano lamination device was also verified.

Key words: polymer, microlayer co?extrusion, simulation, inorganic particle, mixing effect

CLC Number:

TQ315

ZHANG Liyan, DU Xiangyu, DING Yumei, YANG Weimin, JIAO Zhiwei, HE Wei. Simulation analysis of mixing effect of inorganic particles in polymer microlayer⁃stacking extrusion process[J]. China Plastics, 2024, 38(11): 70-75.

Figures/Tables 15

Fig.1. Model of the one⁃quarter four⁃layer runner

Fig.2. Model of the layer⁃stacking element runner

入口长

（L₁）

入口宽（W₁）

出口长

（L₂）

出口宽

（W₂）

流道长度

（L）

100

110

Tab.1. Flow channel structure parameters

Fig.3. Schematic diagram of mechanism of dispersion and distribution mixing

Fig.4. Shear stress cloud image of the micronano laminated elements

Fig.5. Maximum shear stress distribution density

流道类型	平均剪切应力
双螺杆	61 636
层叠	5 068 985

Tab.2. Average shear stress of different processes

Fig.6. Diameter distribution density curves at the outlet

Fig.7. Shear rate cloud image of central section of the micronano laminated element

Fig.8. Shear rate cloud image of the micronano laminated element with different sections

Fig.9. Schematic diagram of the molecular orientation in layer⁃stacking element runner

Fig.10. Distribution index curves

Fig.11. Velocity cloud image of the layer⁃stacking element runner

Fig.12. Separation scale curves

Fig.13. Distribution mixing process of the two particle

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