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Effects of viscous flow activation energies and viscosities on waterborne light-diffusion dip-coatings

Tian Fang (Department of Chemical Engineering, South China University of Technology, Guangzhou, China)
Daiyong Ye (Department of Chemical Engineering, South China University of Technology, Guangzhou, China)

Pigment & Resin Technology

ISSN: 0369-9420

Article publication date: 16 August 2019

Issue publication date: 21 August 2019

Abstract

Purpose

This paper aims to prepare good waterborne light-diffusion dip-coatings (WLDDC) for the glass lampshade inner walls of LED lamp tubes, the effects of viscosities and viscous flow activation energies on these dip-coatings were investigated.

Design/methodology/approach

The WLDDC were prepared using white pigments, light-diffusion agents, additives and an acrylic emulsion. The dip-coatings were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy and a digital rotational viscometer, respectively. The effects of shear rates, temperatures and solids contents on the viscosities of the dip-coatings were studied. The viscous flow activation energies of these dip-coatings and the emulsion were calculated, compared and studied, respectively.

Findings

The results showed that the non-Newtonian behaviors of these dip-coatings were more prominent than that of the acrylic emulsion. When the temperature was maintained to be a constant and the shear rate was increased, the viscosity decreased and the shear stress increased. When the shear rate was maintained to be a constant, the viscosity decreased with increasing temperatures. The viscous flow activation energies of these dip-coatings decreased with the increasing shear rates. The higher solid contents of WLDDC were, the more its viscosity would decrease with the increasing shear rates, the more prominent its non-Newtonian behaviors would show.

Practical implications

A sample of good WLDDC with balanced properties was illustrated.

Originality/value

This investigation benefits to investigate waterborne environment-friendly dip-coatings for the inner glass walls of lamp tubes. This research provides an approach to optimize the viscosity parameters of light-diffusion dip-coatings.

Keywords

Acknowledgements

The authors are grateful to the test center of South China University of Technology for help with the chemical analysis.

Conflict of Interest: The authors declare that they have no competing interests.

Citation

Fang, T. and Ye, D. (2019), "Effects of viscous flow activation energies and viscosities on waterborne light-diffusion dip-coatings", Pigment & Resin Technology, Vol. 48 No. 5, pp. 415-420. https://doi.org/10.1108/PRT-07-2018-0066

Publisher

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Emerald Publishing Limited

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