Experimental study on mixing performance of extensional flow static mixer

doi:10.19491/j.issn.1001-9278.2022.11.012

Abstract

Abstract:

An extensional flow static mixer was designed for enhancing the mixing effect in the polymer process. Taking the high⁃density polyethylene/polystyrene mixture as a mixing system， combining with the SEM images of the mixing system and the average particle size of the dispersed phase， the mixing performance of the extensional flow static mixer with different plate structures and gaps （0.125~2.0 mm） was investigated. The results indicated that there was little influence on the mixing performance from the plate inlet structure of the extensional flow static mixer. A larger fillet radius at the top of the plate resulted in a better the mixing effect. As the plate gap increased， the mixing performance presented a decreasing⁃increasing⁃decreasing trend.

Key words: static mixer, extensional flow, phase morphology

CLC Number:

TQ315

MA Xiuqing, HAN Shuntao, LIU Xiaohong. Experimental study on mixing performance of extensional flow static mixer[J]. China Plastics, 2022, 36(11): 79-83.

Figures/Tables 11

Fig.1. Structural diagram of EFM

Fig.2. Schematic diagram of the screw configuration

区域	温度/℃
T₁	220
T₂	230
T₃	230
T₄	230
T₅	230
T₆	220
T₇	220

Tab.1. Temperature setting value of each barrel section

Fig.3. Structure diagram of extensional flow channel

盘型号	入口	A/mm	α/（°）	C/mm	D/mm
I^a	平滑	—	—	—	—
II	平滑	1.5	60	1.0	0.5
III	收缩	1.5	60	1.0	0.5
IV	收缩	1.5	60	0.5	0.2

Tab.2. Parameters of the EFM with various types of plate

Fig.4. Enlarged drawing of stretching flow channel between two plates

Fig.5. SEM images of PE⁃HD/PS prepared using EFM with different plate structure

盘形结构

D ¯

_n/μm

D ¯

_w/μm

D ¯

_v/μm

III

8.474 690

6.762 717

6.793 048

7.486 036

9.935 032

7.815 336

7.896 759

8.894 169

12.922 17

10.185 82

10.216 56

12.120 12

盘形结构

D ¯

_n/μm

D ¯

_w/μm

D ¯

_v/μm

III

8.474 690

6.762 717

6.793 048

7.486 036

9.935 032

7.815 336

7.896 759

8.894 169

12.922 17

10.185 82

10.216 56

12.120 12

Tab.3. Particle size of PS in PE⁃HD/PS prepared using EFM with different plate structure

Fig.6. SEM images of PE⁃HD/PS prepared using EFM with different δ

δ/mm

D ¯

_n/μm

D ¯

_w/μm

D ¯

_v/μm

0.125

0.250

0.375

0.500

0.625

0.750

1.000

1.250

1.500

1.750

2.000

6.516 247

6.645 640

7.279 608

7.486 036

7.875 022

8.655 156

6.651 582

7.469 384

7.690 182

7.710 810

7.974 195

7.920 272

7.816 122

8.821 328

8.894 169

9.423 812

10.406 740

8.232 918

8.538 433

9.009 851

9.320 641

9.301 835

11.126 56

11.284 15

11.793 07

12.120 12

13.909 37

15.790 05

11.964 68

12.371 51

12.641 19

15.652 81

12.986 11

δ/mm

D ¯

_n/μm

D ¯

_w/μm

D ¯

_v/μm

0.125

0.250

0.375

0.500

0.625

0.750

1.000

1.250

1.500

1.750

2.000

6.516 247

6.645 640

7.279 608

7.486 036

7.875 022

8.655 156

6.651 582

7.469 384

7.690 182

7.710 810

7.974 195

7.920 272

7.816 122

8.821 328

8.894 169

9.423 812

10.406 740

8.232 918

8.538 433

9.009 851

9.320 641

9.301 835

11.126 56

11.284 15

11.793 07

12.120 12

13.909 37

15.790 05

11.964 68

12.371 51

12.641 19

15.652 81

12.986 11

Tab.4. Particle size of PS in PE⁃HD/PS prepared using EFM with different δ

Fig.7. D¯n⁃δ curve of PS

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