Structure and property development during solidification of VOC compliant automotive refinish clearcoats

K. Jindal; D. Bhattacharya; L. F. Francis; A. V. McCormick; L. T. Germinario; C. Williams

doi:10.1016/j.porgcoat.2009.10.030

Structure and property development during solidification of VOC compliant automotive refinish clearcoats

K. Jindal, D. Bhattacharya, L. F. Francis, A. V. McCormick, L. T. Germinario, C. Williams

Chemical Engineering and Materials Science

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

A model volatile organic compound (VOC) compliant two component (2K) acrylic polyol refinish clearcoat was prepared and used to study the effects of a cellulose-based additive on drying, curing, rheology and stress development at room temperature. Results were compared with commercially available VOC compliant and traditional non-compliant clearcoats. Most of the drying of the low VOC coatings occurred before appreciable (20%) crosslinking. Tensile stress developed in the same timeframe as drying and then relaxed over a longer time scale. All coatings had relatively low levels of peak stress (<0.25 MPa) compared to other polymer coatings. Model low VOC coatings prepared with the additive had higher peak stresses than those without the additive. In addition, rheological data showed that the additive resulted in greater viscosity buildup after application. Both effects are attributed to the high glass transition temperature of the additive (∼70 °C).

Original language	English (US)
Pages (from-to)	296-301
Number of pages	6
Journal	Progress in Organic Coatings
Volume	67
Issue number	3
DOIs	https://doi.org/10.1016/j.porgcoat.2009.10.030
State	Published - Mar 2010

Bibliographical note

Funding Information:
The authors thank Eastman Chemical for material donations. Financial support for stress, drying and curing studies was provided by industrial sponsors of the Coating Process Fundamentals Program of the Industrial Partnership for Research in Interfacial and Materials Engineering. Parts of this work were carried out in the University of Minnesota I.T. Characterization Facility, which receives partial support from NSF through the NNIN program.

Keywords

Cellulose-based additive
Drying
Polyurethane
Refinish clearcoat
Rheology
Stress

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title = "Structure and property development during solidification of VOC compliant automotive refinish clearcoats",

abstract = "A model volatile organic compound (VOC) compliant two component (2K) acrylic polyol refinish clearcoat was prepared and used to study the effects of a cellulose-based additive on drying, curing, rheology and stress development at room temperature. Results were compared with commercially available VOC compliant and traditional non-compliant clearcoats. Most of the drying of the low VOC coatings occurred before appreciable (20%) crosslinking. Tensile stress developed in the same timeframe as drying and then relaxed over a longer time scale. All coatings had relatively low levels of peak stress (<0.25 MPa) compared to other polymer coatings. Model low VOC coatings prepared with the additive had higher peak stresses than those without the additive. In addition, rheological data showed that the additive resulted in greater viscosity buildup after application. Both effects are attributed to the high glass transition temperature of the additive (∼70 °C).",

keywords = "Cellulose-based additive, Drying, Polyurethane, Refinish clearcoat, Rheology, Stress",

author = "K. Jindal and D. Bhattacharya and Francis, {L. F.} and McCormick, {A. V.} and Germinario, {L. T.} and C. Williams",

note = "Funding Information: The authors thank Eastman Chemical for material donations. Financial support for stress, drying and curing studies was provided by industrial sponsors of the Coating Process Fundamentals Program of the Industrial Partnership for Research in Interfacial and Materials Engineering. Parts of this work were carried out in the University of Minnesota I.T. Characterization Facility, which receives partial support from NSF through the NNIN program. ",

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AU - Francis, L. F.

AU - McCormick, A. V.

AU - Germinario, L. T.

AU - Williams, C.

N1 - Funding Information: The authors thank Eastman Chemical for material donations. Financial support for stress, drying and curing studies was provided by industrial sponsors of the Coating Process Fundamentals Program of the Industrial Partnership for Research in Interfacial and Materials Engineering. Parts of this work were carried out in the University of Minnesota I.T. Characterization Facility, which receives partial support from NSF through the NNIN program.

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N2 - A model volatile organic compound (VOC) compliant two component (2K) acrylic polyol refinish clearcoat was prepared and used to study the effects of a cellulose-based additive on drying, curing, rheology and stress development at room temperature. Results were compared with commercially available VOC compliant and traditional non-compliant clearcoats. Most of the drying of the low VOC coatings occurred before appreciable (20%) crosslinking. Tensile stress developed in the same timeframe as drying and then relaxed over a longer time scale. All coatings had relatively low levels of peak stress (<0.25 MPa) compared to other polymer coatings. Model low VOC coatings prepared with the additive had higher peak stresses than those without the additive. In addition, rheological data showed that the additive resulted in greater viscosity buildup after application. Both effects are attributed to the high glass transition temperature of the additive (∼70 °C).

AB - A model volatile organic compound (VOC) compliant two component (2K) acrylic polyol refinish clearcoat was prepared and used to study the effects of a cellulose-based additive on drying, curing, rheology and stress development at room temperature. Results were compared with commercially available VOC compliant and traditional non-compliant clearcoats. Most of the drying of the low VOC coatings occurred before appreciable (20%) crosslinking. Tensile stress developed in the same timeframe as drying and then relaxed over a longer time scale. All coatings had relatively low levels of peak stress (<0.25 MPa) compared to other polymer coatings. Model low VOC coatings prepared with the additive had higher peak stresses than those without the additive. In addition, rheological data showed that the additive resulted in greater viscosity buildup after application. Both effects are attributed to the high glass transition temperature of the additive (∼70 °C).

KW - Cellulose-based additive

KW - Drying

KW - Polyurethane

KW - Refinish clearcoat

KW - Rheology

KW - Stress

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Structure and property development during solidification of VOC compliant automotive refinish clearcoats

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Bibliographical note

Keywords

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