Study on Poly（ethylene terephthalate） for 3D Printing

doi:10.19491/j.issn.1001-9278.2021.05.005

Abstract

Abstract:

The PET wire material was prepared by selecting poly（ethylene terephthalate）（PET） as a matrix using PBT as a compatibilizer along with a toughening agent and a nucleating agent. It was found that the wire material obtained at a PET/PBT weight ratio of 7/3 presented the lowest melt flow rate. The addition of too much compatibilizer resulted in bridging at the screw inlet， which was disadvantageous to screw extrusion. The results obtained from the 3D printing and mechanical measurement indicated that the wire material could be normally printed at a content of toughening agent of 15 phr. The printed specimen exhibited a smooth surface without any warps. The wire material achieved tensile strength of 25.95 MPa， bending strength of 45.99 MPa， and impact strength of 50.4 kJ/m². The addition of 0.5 phr talc can improve the mechanical strength of the material better.

Key words: poly（ethylene terephthalate）, poly（butylene terephthalate）, modification, three dimension printing

CLC Number:

WANG Chenlei, HU Hao, QIAO Wenyu. Study on Poly（ethylene terephthalate） for 3D Printing[J]. China Plastics, 2021, 35(5): 24-31.

Figures/Tables 15

熔体流动速率/

g·(10 min）^-1

70.77

82.45

74.06

Tab.1. Melt flow rate of different PET

Fig.1. Melt flow rate of PET/PBT with different proportions

Fig.2. Torque diagram of PET/PBT with different ratios of PET and PBT

Fig.3. Chart of speed change with time

Fig.4. DSC curves of PET/PBT with different ratios of PET and PBT

Fig.5. FTIR spectrum of various samples

Fig.6. Effect of compatibilizer content on the torque

成核剂类型及含量	拉伸强度/MPa	弯曲强度/MPa	冲击强度/kJ·m^-2
0.2份滑石粉	25.83	43.37	47.4
0.2份聚酯成核剂	26.09	39.07	42.3
0.5份滑石粉	34.32	66.21	43.05
0.5份聚酯成核剂	15.47	49.23	43.29

Tab.2. Printing condition and mechanical properties of the materials with nucleating agent

Fig.7. Melt flow rate of materials with different amount of compatibilizer

Fig.8. Melt flow rate of materials with different amount of toughening agent

Fig.9. Effect of toughening agent content on torque

Fig.10. DSC curves of different samples

Fig.11. Print renderings

Fig.12. Relationship between mechanical strength and EBA content

Fig.13. XRD spectra before and after adding nucleating agent

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