Effect of screw configuration on properties of PBAT/Talc composites

doi:10.19491/j.issn.1001-9278.2023.12.015

Abstract

Abstract:

T　he effect of screw configurations of mixing section on the performance of PBAT/Talc composites was investigated through a combination of simulation and experimentation. The results indicated that the uniform dispersion of fillers in the matrix was positively correlated with the number of mixing screw elements for dispersion distribution. However， an increase in the number of dispersion distribution elements accentuated the degradation of the PBAT matrix， leading to a decrease in the mechanical properties. This study demonstrated that the composites exhibited optimal performance when prepared through a combination of sequential distribution and dispersion of screw elements.

Key words: screw configuration, dispersed mixing, film performance

CLC Number:

TQ320.66⁺3

WANG Congxiao, ZHENG Jiaxin, ZHAO Yuyin, SU Zhenqian, REN Feng. Effect of screw configuration on properties of PBAT/Talc composites[J]. China Plastics, 2023, 37(12): 101-108.

Figures/Tables 13

实验编号	实验类型	编码
1^#	对照组	SE/36/36+SE/36/36+ SE/24/24+SE/24/24
2^#	分散混合	SE/36/36+SE/24/24+K45/5/24+K45/5/12+ K90/5/12+SE/24/12L
3^#	分布混合	SE/36/36+SE/24/24+SME+TME+SE/24/12L
4^#	先分散后分布	SE/36/36+K45/5/24+SE/24/24+TME+SE/24/12L
5^#	先分布后分散	SE/36/36+TME+SME+K45/5/24+K45/5/12L
6^#	分散分布交错布置	SE/24/24+K45/5/24+SME+TME+ K45/5/12+ K45/5/12

Tab.1. Screw configuration for each experimental group

边界	边界条件	代号	数值	单位
机筒壁面	壁面无相对运动	VB	0	m/s
左螺杆	转速	NL	150	r/min
右螺杆	转速	NR	150	r/min
流场入口	体积流率	Q	1.043×10^-6	m³/s
流量出口	出口压力	P	5	MPa

Tab.2. Setting boundary conditions

Fig.1. Schematic of the screw configuration of the co⁃rotating twin⁃screw extruder ZSK25

Fig.2. Shear stress fields from the six different screw configurations，respectively

Fig.3. Cumulative maximum shear stress distribution by the six different screw configurations，respectively

Fig.4. Return flow of fluid in the channel by the different screw configurations，respectively

Fig.5. Distribution of residence time of tracer particles in the flow field and their probability density

Fig.6. SEM diagram of PBAT/Talc blend under different screw combinations

Fig.7. Comparison of the distribution uniformity of talc in PBAT matrix

Fig.8. Rheological curve of a PBAT/Talc complex

Fig.9. Effect of screw configuration on tensile properties of PBAT/modified talc composite film

样品	平均剪切应力/MPa	平均停留时间/s	回流量/ cm³·s^-1	拉伸强度/ MPa	断裂伸长率/%
1^#	0.216	39.7	4.34	33.8	426
2^#	0.218	49.0	5.20	34.3	527
3^#	0.232	45.3	4.98	34.2	457
4^#	0.234	46.9	4.71	32.7	410
5^#	0.230	49.6	5.61	35.4	489
6^#	0.228	47.9	6.07	34.5	507

Tab.3. Part simulation results and film tensile performance statistics

Fig.10. Relationship between simulation results and tensile strength

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