Preparation and Properties of Sepiolite Superhydrophobic Composite Coating

doi:10.11901/1005.3093.2021.205

Chinese Journal of Materials Research

2021, Vol. 35

Issue (12): 942-950 DOI: 10.11901/1005.3093.2021.205

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Preparation and Properties of Sepiolite Superhydrophobic Composite Coating

WANG Yang, ZHANG Lei, WANG Lei, ZHANG Yan, TANG Qingguo(

), DU Te, JIAO Wanxue, FENG Xuebin

School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300400, China

Cite this article:

WANG Yang, ZHANG Lei, WANG Lei, ZHANG Yan, TANG Qingguo, DU Te, JIAO Wanxue, FENG Xuebin. Preparation and Properties of Sepiolite Superhydrophobic Composite Coating. Chinese Journal of Materials Research, 2021, 35(12): 942-950.

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Abstract

The suspension of sepiolite powder in the mixture of anhydrous ethanol, ammonia and ethyl orthosilicate was first prepared and then coupling modified with surfactant in varying process conditions. Further, the modified sepiolite powder was acquired from the prepared suspension by means of ultrasonic assisted stirring, centrifugal dehydration, washing, drying and grinding successively. The modified sepiolite powder was dispersed in anhydrous ethanol and applied on the surface of glass slide to prepare a thin superhydrophobic coating. The contact angle (CA) and rolling angle (SA) of the coating with water were measured by using OCA 20 contact angle tester, the structure of functional groups on the surface of powders before and after modification was analyzed by Bruker-80V Fourier transform infrared spectrometer, the changes of elements on the surface of powders before and after modification were analyzed by Escalab 250XI X-ray photoelectron spectroscopy, the micromorphology of the powders before and after modification was observed by Nova Nano SEM450 and JEM-1230 transmission electron microscopy, and the properties of sepiolite superhydrophobic composite coating were investigatied. The results show that: when the modification is carried out at 0℃ for 3 h, with 1 g of sepiolite powder as raw material and 0.8 mL of cetyltrimethoxy silane as modifier. A coating made of the modified sepiolite powder presents a contact angle of 157.2° with a rolling angle of 10.5°. During modification process SiO₂ particles were adsorbed on the surface of sepiolite to create a rough surface, which was grafted with long chain alkyl groups of cetyltrimethoxy silane. The adhesion of water droplets to the coating surface decreases rapidly first and then slowly with the increase of the volume of water droplets. Due to the weak adhesion of water droplets to the coating, the water droplets can easy roll on the coating surface, so that resulted in good self-cleaning performance of the coating.

Key words: inorganic non-metallic materials superhydrophobic modified composite sepiolite coating

Received: 29 March 2021

ZTFLH:

TB33

Fund: Hebei University of Technology Student Innovation and Entrepreneurship Training Program(S201910080033)

About author: TANG Qingguo, Tel: 13132097129, E-mail: qingguo_tang@163.com

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	Yang WANG
	Lei ZHANG
	Lei WANG
	Yan ZHANG
	Qingguo TANG
	Te DU
	Wanxue JIAO
	Xuebin FENG

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.205 OR https://www.cjmr.org/EN/Y2021/V35/I12/942

Fig.1 Effect of modification temperature on hydrophobicity of coating

Fig.2 Effect of modification time on hydrophobicity of coating

Fig.3 Effect of content of meerschaum on hydrophobicity of coating

Fig.4 Effect of modifier addition on hydrophobicity of coating

Fig.5 Effect of modifier addition on surface functional groups of powders

Fig.6 Effect of modification time on surface functional groups of powders

Fig.7 Effect of modification on chemical composition of powders (a) XPS spectra of the powders before and after modification; (b) XPS spectra of O 1s in the unmodified sepiolite; (c) XPS spectra of O 1s in the powders after 3 h modification; (d) XPS spectra of Si 2p in the unmodified sepiolite; (e) XPS spectra of Si 2p in the powders after 3 h modification

Fig.8 Mechanism of modification of sepiolite superhydrophobic composite powder

Fig.9 Effect of modification on morphology and roughness of powders (a) SEM photos of the unmodified sepiolite; (b, c) SEM photos of the modified powders; (d, e, f) TEM photos of the modified powders

Fig. 10 Photos of adhesion process between coating and droplet (a) coating moves up and contacts with water drop; (b) coating moves up and extrudes water drop; (c) coating moves down; (d) coating moves down and leaves water drop

Fig.11 Adhesion of coating to water drop

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