Abstract
Compatibility of polymeric dispersant with other components in a coating is an important criterion to formulate coating with desirable optical properties, particularly surface gloss. This study detailed the synthesis of polymeric dispersant incorporated with fatty acid pigment anchoring group, PD-1, and its subsequent application in various types of organic coating binder systems. 1H-NMR analysis indicated about 98% of monomer conversion has taken place during the synthesis. Incorporation of oleic acid in the dispersant was highly strategic, resulting with long alky side chain along the dispersant chain for better steric stabilization effect, long hydrocarbon chain terminated with -COOH to serve as flexible and efficient pigment anchoring group, as well as improved the compatibility of the dispersants in wide range of organic coating binder systems. The synthesized fatty acid-based polymeric dispersant adsorbed well on the titania pigment surface and could effectively disperse and stabilize them. Titania paste prepared with PD-1 recorded the lowest viscosity close to 180 cps and the value remained approximately constant after 2 weeks of aging. The good compatibility of the PD-1 with other components in a coating mixture enabled the formation of relatively small particle size that correlates well with the surface gloss of the coatings. From benchmarking exercise, the synthesized dispersant performed equally well, if not better than the commercial dispersants. The color stability of coatings formulated with PD-1 remained the highest (dE = 0.1 to 0.3), recorded lowest rub out values (dE = 0.5 to 0.6), and highest contrast ratio in various coating systems.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Funding
We would like to acknowledge the financial support from Ministry of Higher Education Malaysia through Fundamental Research Grant Scheme (Project number: FRGS/1/2021/STG04/UM/02/4).
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Mr. Boon-Leong Lim: Conceptualization, Methodology, Validation, Visualization, Formal analysis, Investigation, Data Curation, Writing – Original Draft. Dr. Desmond Teck-Chye Ang: Conceptualization, Methodology, Funding acquisition, Resources, Writing – Review & Editing, Supervision, Project administration.
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Lim, BL., Ang, D.TC. Polymeric dispersant incorporated with fatty acid as TiO2 anchoring group for surface coating applications. J Polym Res 30, 446 (2023). https://doi.org/10.1007/s10965-023-03830-3
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DOI: https://doi.org/10.1007/s10965-023-03830-3