Effects of Solvent and Additive on PA12 Powders Prepared by Solvent Precipitation Method

doi:10.19491/j.issn.1001-9278.2020.12.011

Abstract

Abstract:

PA12 powders were prepared by a solvent precipitation method at different contents of ethanol and additives, and their properties were investigated. The results indicated that the content of ethanol and additives were highly related to the performance of PA12 powders. The average particle size of PA12 powders decreased at first and then tended to increase with an increase in the ethanol concentration. Moreover， the particle size distribution of PA12 powders became more uniform， and their flow rate and density increased and decreased， respectively， as a result of the increase of ethanol concentration. With an increase in the content of SiO₂ as an additive， PA12 powders presented an increased flow rate and the uniformity of particle size distribution， and however their average particle size and density decreased at first and then tended to increase.

Key words: polyamide12, silica, solvent precipitation method, powder, particle size distribution

CLC Number:

TQ323.6

Changlong CHI, Yanfei AN, Yaru YAN, Xiang YU. Effects of Solvent and Additive on PA12 Powders Prepared by Solvent Precipitation Method[J]. China Plastics, 2020, 34(12): 65-69.

Figures/Tables 12

Fig.1. Particle size frequency distribution of PA12 powders with different ethanol concentration

Fig.2. Average particle size of PA12 powders with different ethanol concentration

Fig.3. SEM images of PA12 powders with different ethanol concentrations

乙醇浓度/ %	松装密度/ g·cm^-3	振实密度/ g·cm^-3	压缩度/ %	休止角/ （°）
80	0.280	0.304	7.89%	56.31
85	0.272	0.286	4.90%	54.46
90	0.171	0.176	2.84%	50.19
95	0.153	0.157	2.55%	48.74
100	0.148	0.164	9.76%	47.72

Tab.1. Density and angle of repose of PA12 powders with different ethanol concentration

Fig.4. Loose and tapped density of PA12 powders with different ethanol concentrations

Fig.5. Flow rate of PA12 powders with different ethanol concentration

Fig.6. Particle size frequency distribution of PA12 powders with different SiO2 content

Fig.7. Average particle size of PA12 powders with different SiO2 content

SiO₂含量/%	松装密度/ g·cm^-3	振实密度/ g·cm^-3	压缩度/%	休止角/ （° ）
0	0.251	0.276	9.06%	50.19
0.5	0.171	0.186	8.06%	45.00
1	0.123	0.133	7.52%	41.99
2	0.191	0.212	9.91%	40.36
5	0.262	0.308	14.94%	38.66

Tab.2. Density and angle of repose of PA12 powders with different SiO2 content

Fig.8. Loose and tapped density of PA12 powders with different SiO2 content

Fig.9. Flow rate of PA12 powders with different SiO2 content

Fig.10. XRD diffraction curves of PA12 powders with different SiO2 content

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