Antibacterial and anti-flaming PA6 composite with metathetically prepared nano AgCl@BaSO<sub>4</sub> co-precipitates

doi:10.1007/s11705-020-1942-9

Front. Chem. Sci. Eng.

2021, Vol. 15

Issue (2) : 340-350 https://doi.org/10.1007/s11705-020-1942-9

RESEARCH ARTICLE

Antibacterial and anti-flaming PA6 composite with metathetically prepared nano AgCl@BaSO₄ co-precipitates

Wei Zhang¹, Boren Xu¹, Caihong Gong¹, Chunwang Yi^1,²(

), Shen Zhang¹

¹. Key Laboratory of Sustainable Resources Processing and Advanced Materials of Hunan Province, College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China
². National & Local Joint Engineering Laboratory for New Petro-chemical Materials and Fine Utilization of Resources, Hunan Normal University, Changsha 410081, China

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Abstract

In this study, a facile and environmentally friendly method with low energy consumption for preparing nanoscale AgCl and BaSO₄ co-precipitates (AgCl@BaSO₄ co-precipitates) was developed based on the metathetical reaction. Then, the dried co-precipitates were melt-compounded with polyamide 6 (PA6) resins at a specified mass ratio in a twin-screw extruder. The results demonstrated that in the absence of any coating agent or carrier, the nanoparticles of AgCl@BaSO₄ co-precipitates were homogeneously dispersed in the PA6 matrix. Further analysis showed that after the addition of AgCl@BaSO₄ co-precipitates, the antibacterial performance, along with the flame-retardance and anti-dripping characteristics of PA6, was enhanced significantly. In addition, the PA6 composites possessed high spinnability in producing pre-oriented yarn.

Keywords nano AgCl@BaSO₄ co-precipitates antibacterial flame resistance PA6 composite PA6 yarn

Corresponding Author(s): Chunwang Yi

Just Accepted Date: 22 April 2020 Online First Date: 23 June 2020 Issue Date: 10 March 2021

Cite this article:

Wei Zhang,Boren Xu,Caihong Gong, et al. Antibacterial and anti-flaming PA6 composite with metathetically prepared nano AgCl@BaSO₄ co-precipitates[J]. Front. Chem. Sci. Eng., 2021, 15(2): 340-350.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-020-1942-9
https://academic.hep.com.cn/fcse/EN/Y2021/V15/I2/340

Fig.1 Scheme 1 Process illustration of the preparation of AgCl@BaSO₄ co-precipitates, PA6-AgCl@BaSO₄ composites and fibres.

Fig.2 Particle size distribution diagrams of AgCl@BaSO₄ co-precipitates at (a) 30°C, (b) 40°C, (c) 50°C and (d) 60°C.

Fig.3 TEM and chemical mapping images of AgCl@BaSO₄ co-precipitates.

Fig.4 X-ray patterns of (a) mixtures of Ag₂SO₄ and BaCl₂, (b) AgCl@BaSO₄ co-precipitates and (c) mixtures of commercially available AgCl and BaSO₄.

Fig.5 SEM images of PA6-AgCl@BaSO₄ composites: (a), (b), (c) and (d) represent the loadings of AgCl@BaSO₄ at 0.5, 1.0, 1.5 and 2.5 wt-%, respectively; (e) and (f) are magnified images of the red circled areas in (c) and (d).

Fig.6 Thermal stability and mechanical properties of PA6-AgCl@BaSO₄ composites. (A) Tg curves of pure PA6 and PA6-AgCl@BaSO₄ composites; (B) Mechanical properties of PA6-AgCl@BaSO₄ composites. The content of AgCl and BaSO₄ co-precipitates from (a) to (e) is 0, 0.5, 1.0, 1.5 and 2.5 wt-%.

Fig.7 Antibacterial performance of PA6-AgCl@BaSO₄ composites (A) Counting pictures of PA6-AgCl@BaSO₄ composites with various silver contents. (a1?e1) S. aureus; (a2?e2) E. coli; The Ag⁺ contents for (a?f) are 0, 0.2, 0.4, 0.5 and 0.6 wt-%, respectively; (B) The counting results of PA6-AgCl@BaSO₄ composites with various silver contents.

Fig.8 Inhibition zones of PA6-AgCl@BaSO₄ composites with various silver contents for 24 h. (a1?f1) E. coli; (a2?f2) S. aureus. The Ag⁺ contents for (a?f) are 0, 0.2, 0.3, 0.4, 0.5 and 0.6 wt-%, respectively (Note: White plates are pure PA6).

Tab.1 Inhibition zones of PA6-AgCl@BaSO₄ composites with various silver contents for 24 h

Tab.2 Flame retardance of the PA6-AgCl@BaSO₄ composite ^a)

Fig.9 Digital photographs of samples during and after?burning: The content of the AgCl@BaSO₄ co-precipitates from (a) to (d) is 0, 0.5, 1.5 and 2.5 wt-%.

Fig.10 SEM images of the surface morphologies of antibacterial PA6-AgCl@BaSO₄ fibres: (a,b) and (c,d) represent the loading of co-precipitates at 1.5 and 2.5 wt-%, respectively; the drawing?ratio of (a) and (e) is 2.5, and the drawing?ratio of (b) and (d) is 2.8.

Tab.3 Mechanical properties of PA6-AgCl@BaSO₄ fibres

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