Study on Forming Process of 3D Printing Polymer Through Non⁃solvent Induced Phase Separation

doi:10.19491/j.issn.1001-9278.2021.11.011

Abstract

Abstract:

Based on the principle of non-solvent induced phase separation， a self-made controllable humidity and gas-assisted 3D printer was used to conduct the 3D printing of high-temperature-resistant special engineering plastics with a high precision and a low cost at ordinary temperatures. Taking polyetherimide as a special engineering plastic example， the effects of extrusion pressure， nozzle diameter， printing speed， relative humidity of printing environment， and printing layer on the forming quality were investigated. The results indicated that the width of extruded wire was related to the printing speed and relative humidity of the printing environment， and it decreased with an increase in printing speed and relative humidity. The printing layer height was related to the wire height of extrusion slurry. When the printing layer height was about equal to the wire height of extrusion slurry， the forming quality was optimal. The optimal printing parameters were obtained from a multilayer deposition experiment， achieving the green body with a good surface quality and a precision.

Key words: three-dimensional printing, non?solvent induced phase separation, polyetherimide, forming process

CLC Number:

TQ 323.7

ZHANG Liyan, GAO Lijie, MA Haopeng, MA Jubiao, YANG Weimin, JIAO Zhiwei, YU Yuan. Study on Forming Process of 3D Printing Polymer Through Non⁃solvent Induced Phase Separation[J]. China Plastics, 2021, 35(11): 71-76.

Figures/Tables 13

Fig.1. Schematic diagram of 3D printing principle of non?solvent induced phase separation

Fig.2. Schematic diagram of controllable humidity gas assisted 3D printer

喷头直径/ mm	挤出压力/MPa
喷头直径/ mm	0.1	0.2	0.3	0.4	0.5
0.41	0	0	0.001 0	0.001 9	0.003 7
0.60	0.000 9	0.002 1	0.004 3	0.007 6	0.010 6
0.84	0.003 3	0.007 0	0.011 6	0.016 7	0.022 5

Tab.1. Effect of extrusion pressure and nozzle diameter on slurry flow rate

Fig.3. Relationship between extrusion pressure and nozzle diameter and slurry flow rate

Fig.4. Effect of printing speed and environmental relative humidity on wire width

Fig.5. Deposition of PEI wire at printing speed greater than 12 mm/s

Fig.6. Deposition of PEI wire under different environmental humidity

Fig.7. Effect of printing speed and environmental relative humidity on wire thickness

Fig.8. Prismatic green bodies with different printing layer heights

打印参数	打印速度/ mm·s^-1	打印环境相对湿度/%	打印层高/ mm
第一组	10	65~70	0.48
第二组	12	65~70	0.46
第三组	10	75~80	0.50
第四组	12	75~80	0.48

Tab.2. Setting of printing parameters

Fig.9. PEI porous grid green bodies under different printing parameters

Fig.10. PEI porous grid green body formed under optimal printing parameters

Fig.11. PEI green bodies formed under optimal printing parameters

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