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. 2018 Dec 19;10(12):1406.
doi: 10.3390/polym10121406.

Properties of Waterborne Polyurethane Conductive Coating with Low MWCNTs Content by Electrostatic Spraying

Fangfang Wang  1 , Lajun Feng  2   3 , Guangzhao Li  4
Affiliations

Properties of Waterborne Polyurethane Conductive Coating with Low MWCNTs Content by Electrostatic Spraying

Fangfang Wang et al. Polymers (Basel). .

Abstract

Because flammable organic solvents are emitted during the construction process, oil-based conductive coatings generally result in potential safety problems. A high content of conductive mediums can also weaken the adhesive and protective abilities of existing conductive coatings. Therefore, an anticorrosive and conductive coating was prepared on Q235 steel substrate by spraying the multi-walled carbon nanotubes (MWCNTs)/waterborne polyurethane (WPU) dispersion with a low MWCNT content in this work. The effect of the MWCNT content on the electrical conductivity, corrosion resistance, and adhesive strength of the WPU conductive coating was investigated. It was concluded that a spatial network structure of MWCNTs-WPU was formed to make the coating structure more compact. The electrical conductivity, corrosion resistance, and adhesive strength of the WPU conductive coating first increased and then decreased as the MWCNT content increased. When the MWCNT content was only 0.2 wt % (which was far lower than that of the existing conductive coatings at 1 wt %), the coating began to conduct electricity; its resistivity was 12,675.0 Ω·m. The best combination property was the 0.3 wt % MWCNTs/WPU conductive coating. Its adhesive strength was 19.99% higher than that of pure WPU coating. Its corrosion rate was about one order of magnitude lower than that of pure WPU coating after being immersed in 3.5 wt % NaCl solution for 17 days.

Keywords: adhesive strength; conductive coating; corrosion resistance; electrical conductivity; multi-walled carbon nanotubes; waterborne polyurethane.

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Conflict of interest statement

The authors declare no conflict of interest exists in the submission of this manuscript. All the authors listed have approved the manuscript that is enclosed.

Figures

Figure 1
Figure 1
FTIR spectra of MWCNTs/WPU coatings with different MWCNTs contents.
Figure 2
Figure 2
SEM images of (a) 0.2 wt % MWCNTs/WPU conductive coating, (b) 0.3 wt % MWCNTs/WPU conductive coating, and (c) 0.6 wt % MWCNTs/WPU conductive coating.
Figure 2
Figure 2
SEM images of (a) 0.2 wt % MWCNTs/WPU conductive coating, (b) 0.3 wt % MWCNTs/WPU conductive coating, and (c) 0.6 wt % MWCNTs/WPU conductive coating.
Figure 3
Figure 3
Polarization curves of different MWCNTs/WPU conductive coatings.
Figure 4
Figure 4
Nyquist plots of MWCNTs/WPU conductive coatings with different MWCNTs contents.
Figure 5
Figure 5
|Z|0.01HZ values of MWCNTs/WPU conductive coatings with different MWCNTs contents.
Figure 6
Figure 6
Load-displacement curves of different MWCNTs/WPU conductive coatings.
See this image and copyright information in PMC

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