A core-shell composite pigment with rutile TiO2 intensification for UV inhibition--颗粒学报PARTICUOLOGY

Lv, X., Yan, B., Shao, Y., Zhang, H., Zhang, H., & Zhu, J. (2022). A core-shell composite pigment with rutile TiO2 intensification for UV inhibition. Particuology, 67, 18-26. https://doi.org/10.1016/j.partic.2021.09.010

A core-shell composite pigment with rutile TiO₂ intensification for UV inhibition

Xiao Lv ^a, Baowei Yan ^a, Yuanyuan Shao ^a, Haiping Zhang ^a *, Hui Zhang ^{a b *}, Jesse Zhu ^{a b}

a Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China
b Department of Chemical and Biochemical Engineering, Western University, Ontario N6A 5B9, Canada

10.1016/j.partic.2021.09.010

Volume 67, August 2022, Pages 18-26

Received 25 June 2021, Revised 9 September 2021, Accepted 26 September 2021, Available online 6 October 2021, Version of Record 29 November 2021.

E-mail: hpzhang@tju.edu.cn; hzhang1@uwo.ca

Highlights

• Core-shell composite pigments with rutile TiO₂ intensification were proposed.

• Modified pigments exhibited a significant increase in UV absorption.

• Decrease of the color change of coating films was achieved.

• Facile sol-gel method improved UV resistance of pigments for coatings.

Abstract

Organic pigments generally have bright colors but poor ultraviolet (UV) resistance. To improve the UV resistance and extend the applications, a core-shell composite pigment with rutile TiO₂ intensification for UV inhibition is proposed by a facile sol-gel method in this work. A core-shell structure, with a homogeneous sol-gel TiO₂ shell containing additional nanosized rutile TiO₂ particles and with the pigment as the core, was established taking advantage of UV resistance of TiO₂ and binding ability of sol-gel. While the sol-gel TiO₂ shell alone has already shown obvious ultraviolet shielding effect, as tested over different sol-gel aging times and TiO₂ loadings, the UV resistance of the fluorescent pigments was further enhanced by binding the nanosized rutile TiO₂ in the sol-gel shell. At a sol-gel TiO₂ to rutile TiO₂ ratio of 2:1, the UV exposure time is extended about eight times compared with that of the original pigment and twice as that of the modified pigment with pure sol-gel TiO₂ for the same color change. Therefore, the novel core-shell composite pigment intensified with nanosized rutile TiO₂ particles is proved to be efficient in improving the UV resistance of organic pigments.

Graphical abstract

Keywords

Sol-gel; Rutile TiO₂; Organic pigment; Core-shell; UV resistance; Powder coating

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