LAPSE:2019.0889
Published Article
LAPSE:2019.0889
Comparative Study of the Performances of Al(OH)3 and BaSO4 in Ultrafine Powder Coatings
Weihong Li, Diego Cárdenas Franco, Marshall Shuai Yang, Xinping Zhu, Haiping Zhang, Yuanyuan Shao, Hui Zhang, Jingxu Zhu
July 31, 2019
Ultrafine powder coatings are one of the development directions in the powder coating industry, as they can achieve thin coatings with good leveling and high surface smoothness comparable to liquid coatings. Compared to regular coatings, they experience a higher sensitivity to any incompatibilities, e.g., filler from coating components. The properties of fillers play a great role in the performance of coating films. Aluminum trihydrate (Al(OH)3) is a well-known filler in solvent-based coatings and other polymer industries. To study and evaluate the performances of Al(OH)3 in ultrafine powder coatings, a popular filler, barium sulfate (BaSO4) is used for comparison. Both fillers are added in ultrafine powder coatings based on two of the most commonly used resin systems (polyester-epoxy and polyester). The differences of physical and chemical properties between both fillers have significant influences on several properties of powder paints and coating films. The polar groups (hydrogen bond) in Al(OH)3 result in the strong interaction between inorganic filler and organic polymer matrix, thus decreasing the molecular network mobility and influencing the chain formation, which is verified by differential scanning calorimetric (DSC). The bed expansion ratio (BERs) of powder paints incorporated with Al(OH)3 are much higher than those with BaSO4, which indicate more uniform gas-solid contact during the spraying process. Samples with Al(OH)3 exhibit much lower specular gloss at 60°, which are expected to achieve remarkable matting effects. Superior corrosion resistances can be observed for almost all the coated panels incorporated with Al(OH)3 in contrast to those with BaSO4. Other aspects are slightly influenced by the difference between the two fillers, such as the angle of repose values (AORs) of powder paints, the impact resistance and flexibility of coating films.
Keywords
Al(OH)3, BaSO4, filler, ultrafine powder coatings
Subject
Suggested Citation
Li W, Franco DC, Yang MS, Zhu X, Zhang H, Shao Y, Zhang H, Zhu J. Comparative Study of the Performances of Al(OH)3 and BaSO4 in Ultrafine Powder Coatings. (2019). LAPSE:2019.0889
Author Affiliations
Li W: Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Franco DC: Particle Technology Research Center, Department of Chemical & Biochemical Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada
Yang MS: Particle Technology Research Center, Department of Chemical & Biochemical Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada [ORCID]
Zhu X: Wesdon-Rivers Institute of Powder Coatings Science and Technology, Zhaoqing 526000, China
Zhang H: Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Shao Y: Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
Zhang H: Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; Particle Technology Research Center, Department of Chemical & Biochemical Engineering,
Zhu J: Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China; Particle Technology Research Center, Department of Chemical & Biochemical Engineering,
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Journal Name
Processes
Volume
7
Issue
5
Article Number
E316
Year
2019
Publication Date
2019-05-27
Published Version
ISSN
2227-9717
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PII: pr7050316, Publication Type: Journal Article
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LAPSE:2019.0889
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doi:10.3390/pr7050316
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Jul 31, 2019
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