Study on numerical simulation of two⁃phase extrusion for micro/nano⁃laminated natural rubber/polypropylene

doi:10.19491/j.issn.1001-9278.2022.08.018

Abstract

Abstract:

Aiming to ensure the uniform thickness of natural rubber （NR）/polypropylene （PP） compounds extruded by micro/nano lamination， a three?dimensional model laminated flow channel was established. The material viscosity was fitted according to the rheological test results， and then the three?dimensional isothermal viscoelastic flow of NR/PP compounds was numerically simulated. The results showed that the two?phase velocity at the outlet has a drastic change at the same inlet flow rates of the two materials. The velocity difference between different flow channels was large， and the viscosity boundary of two?phase was not clear. Therefore， there was a certain degree of mutual infiltration at the interface. After adjusting the inlet rates of the two phases， the velocity transition tended to be stable with a reduction in the velocity difference between different channels. The viscosity boundary of two?phase was regular without the offset phenomenon.

Key words: laminated flow channel, numerical simulation, natural rubber, polypropylene

CLC Number:

TQ332.6

ZHAO Hongjing, ZHU Jiang. Study on numerical simulation of two⁃phase extrusion for micro/nano⁃laminated natural rubber/polypropylene[J]. China Plastics, 2022, 36(8): 110-114.

Figures/Tables 10

Fig.1. Model for laminated flow channel

Fig.2. Model for finite element meshs

η_∞	η₀	λ	n
20	200 000	15	0.32

Tab.1. Rheological parameters of NR

K	n
7 801.1	0.525 08

Tab.2. Rheological parameters of PP

Fig.3. Viscosity?shear rate curve

Fig.4. Velocity distribution of the material at the outlet

Fig.5. Flow rate of the material

Fig.6. Flow rate distribution of the material at the outlet section

Fig.7. Viscosity distribution of the material at outlet

Fig.8. Polymer two?phase distribution

References 7

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