Leveling measurements of antifouling coatings using an optical profilometer: Effects of additives and solvent concentration and type

Xueting Wang, Claus Erik Weinell, Vicenç Tobar, Stefan Møller Olsen, Søren Kiil*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Ship hulls require smooth antifouling coating surfaces to decrease frictional drag and avoid sites of weakness for biofouling. Consequently, the leveling properties of antifouling coatings should be understood and optimized. In the present work, a novel approach to quantitatively measure leveling properties of coating films was developed. Using this approach, dynamic surface textures during leveling of selected model antifouling formulations were measured using a combination of a three-dimensional (3D) profilometer and a retrofitted automatic film application system. It was found that the leveling process is strongly coupled to the solvent evaporation rate and the associated development in coating viscosity. For low viscous coatings, three leveling stages were observed. High viscous coatings, on the other hand, only went through one leveling stage. Experimental data showed that an underlying tie-coat (relative to a flat acrylic panel) had negative effects on the smoothness of the top coat. In addition, using an anti-sagging agent enabled control of sagging, but resulted in negative effects on leveling. Nevertheless, it was still possible to obtain good leveling performance with anti-sagging agent in a formulation. The effects of minor amounts of three types of additives and two types of solvents on leveling of the model formulations during (and after) spraying application were found to be less significant than those seen from drawdown application. It is therefore important to take into account the application method when studying leveling phenomena.
Original languageEnglish
JournalProgress in Organic Coatings
Volume132
Pages (from-to)159-168
ISSN0300-9440
DOIs
Publication statusPublished - 2019

Keywords

  • Additive
  • Antifouling coating
  • Leveling measurement
  • Sagging
  • Solvent
  • Surface texture

Cite this

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title = "Leveling measurements of antifouling coatings using an optical profilometer: Effects of additives and solvent concentration and type",
abstract = "Ship hulls require smooth antifouling coating surfaces to decrease frictional drag and avoid sites of weakness for biofouling. Consequently, the leveling properties of antifouling coatings should be understood and optimized. In the present work, a novel approach to quantitatively measure leveling properties of coating films was developed. Using this approach, dynamic surface textures during leveling of selected model antifouling formulations were measured using a combination of a three-dimensional (3D) profilometer and a retrofitted automatic film application system. It was found that the leveling process is strongly coupled to the solvent evaporation rate and the associated development in coating viscosity. For low viscous coatings, three leveling stages were observed. High viscous coatings, on the other hand, only went through one leveling stage. Experimental data showed that an underlying tie-coat (relative to a flat acrylic panel) had negative effects on the smoothness of the top coat. In addition, using an anti-sagging agent enabled control of sagging, but resulted in negative effects on leveling. Nevertheless, it was still possible to obtain good leveling performance with anti-sagging agent in a formulation. The effects of minor amounts of three types of additives and two types of solvents on leveling of the model formulations during (and after) spraying application were found to be less significant than those seen from drawdown application. It is therefore important to take into account the application method when studying leveling phenomena.",
keywords = "Additive, Antifouling coating, Leveling measurement, Sagging, Solvent, Surface texture",
author = "Xueting Wang and {Erik Weinell}, Claus and Vicen{\cc} Tobar and Olsen, {Stefan M{\o}ller} and S{\o}ren Kiil",
year = "2019",
doi = "10.1016/j.porgcoat.2019.03.037",
language = "English",
volume = "132",
pages = "159--168",
journal = "Progress in Organic Coatings",
issn = "0300-9440",
publisher = "Elsevier",

}

Leveling measurements of antifouling coatings using an optical profilometer: Effects of additives and solvent concentration and type. / Wang, Xueting; Erik Weinell, Claus; Tobar, Vicenç; Olsen, Stefan Møller; Kiil, Søren.

In: Progress in Organic Coatings, Vol. 132, 2019, p. 159-168.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Leveling measurements of antifouling coatings using an optical profilometer: Effects of additives and solvent concentration and type

AU - Wang, Xueting

AU - Erik Weinell, Claus

AU - Tobar, Vicenç

AU - Olsen, Stefan Møller

AU - Kiil, Søren

PY - 2019

Y1 - 2019

N2 - Ship hulls require smooth antifouling coating surfaces to decrease frictional drag and avoid sites of weakness for biofouling. Consequently, the leveling properties of antifouling coatings should be understood and optimized. In the present work, a novel approach to quantitatively measure leveling properties of coating films was developed. Using this approach, dynamic surface textures during leveling of selected model antifouling formulations were measured using a combination of a three-dimensional (3D) profilometer and a retrofitted automatic film application system. It was found that the leveling process is strongly coupled to the solvent evaporation rate and the associated development in coating viscosity. For low viscous coatings, three leveling stages were observed. High viscous coatings, on the other hand, only went through one leveling stage. Experimental data showed that an underlying tie-coat (relative to a flat acrylic panel) had negative effects on the smoothness of the top coat. In addition, using an anti-sagging agent enabled control of sagging, but resulted in negative effects on leveling. Nevertheless, it was still possible to obtain good leveling performance with anti-sagging agent in a formulation. The effects of minor amounts of three types of additives and two types of solvents on leveling of the model formulations during (and after) spraying application were found to be less significant than those seen from drawdown application. It is therefore important to take into account the application method when studying leveling phenomena.

AB - Ship hulls require smooth antifouling coating surfaces to decrease frictional drag and avoid sites of weakness for biofouling. Consequently, the leveling properties of antifouling coatings should be understood and optimized. In the present work, a novel approach to quantitatively measure leveling properties of coating films was developed. Using this approach, dynamic surface textures during leveling of selected model antifouling formulations were measured using a combination of a three-dimensional (3D) profilometer and a retrofitted automatic film application system. It was found that the leveling process is strongly coupled to the solvent evaporation rate and the associated development in coating viscosity. For low viscous coatings, three leveling stages were observed. High viscous coatings, on the other hand, only went through one leveling stage. Experimental data showed that an underlying tie-coat (relative to a flat acrylic panel) had negative effects on the smoothness of the top coat. In addition, using an anti-sagging agent enabled control of sagging, but resulted in negative effects on leveling. Nevertheless, it was still possible to obtain good leveling performance with anti-sagging agent in a formulation. The effects of minor amounts of three types of additives and two types of solvents on leveling of the model formulations during (and after) spraying application were found to be less significant than those seen from drawdown application. It is therefore important to take into account the application method when studying leveling phenomena.

KW - Additive

KW - Antifouling coating

KW - Leveling measurement

KW - Sagging

KW - Solvent

KW - Surface texture

U2 - 10.1016/j.porgcoat.2019.03.037

DO - 10.1016/j.porgcoat.2019.03.037

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JO - Progress in Organic Coatings

JF - Progress in Organic Coatings

SN - 0300-9440

ER -