Preparation and Formation Mechanism of TEOS / OTMS Superhydrophobic Coating

LI Wenyang, YIN Xiaotong, ZHANG Pengyu, HE Faqi, FENG Liming

doi:10.16577/j.issn.1001-1560.2022.0286

Materials Protection >

2022 , Vol. 55 >Issue 10: 123 - 129

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0286

Preparation and Formation Mechanism of TEOS / OTMS Superhydrophobic Coating

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(1.School of Materials Science and Engineering,Shandong Jianzhu University,Jinan 250101,China;2.Tai’an Lebang Environmental Technology Co.,Ltd.,Tai’an 271208,China)

Received date: 2022-04-25

Revised date: 2022-05-16

Accepted date: 2022-06-21

Online published: 2023-12-23

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Abstract

TEOS-OTMS sols were prepared by sol-gel method using tetraethyl orthosilicate (TEOS) and octyl trimethoxysilane (OTMS) as raw materials.Hydrophobic coatings were prepared on a smooth glass substrate and an etched glass substrate by one-step immersion method.The effects of hydrolysis time on the hydrophobicity and hardness of the coating were studied.The formation mechanisms of TEOS-OTMS sol and hydrophobic coating were proposed.Results showed that colloidal particles with SiO2 particles as the glue core and octylsilane as the cover could be prepared through TEOS-OTMS in-situ hydrolysis polymerization.And a low surface hydrophobic film modified by an octyl chain could take shape on the glass substrate.When TEOS was treated with pre-hydrolysis polymerization for 4 h and the TEOS-OTMS was treated with co-hydrolysis polymerization for 20 min,the hydrophobic angle of the coating reached (124.01±2.00)° and the pencil hardness reached 6 H.The result of an microstructure analysis by scanning electron microscope showed that the glass substrate was etched to form micro protrusions with a spacing of 6.36 nm and an average size of 16.75 nm,which enhanced the entanglement and aggregation of TEOS and OTMS,and pores of 150～200 nm formed in the coating.This “micro roughness”was the key to the formation of superhydrophobic coating,and the hydrophobic angle of the TEOS-OTMS coating reached (160.08±2.00)°.

Key words： superhydrophobic coating; OTMS; TEOS; silane membrane; sol-gel method

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LI Wenyang, YIN Xiaotong, ZHANG Pengyu, HE Faqi, FENG Liming . Preparation and Formation Mechanism of TEOS / OTMS Superhydrophobic Coating[J]. Materials Protection, 2022 , 55(10) : 123 -129 . DOI: 10.16577/j.issn.1001-1560.2022.0286

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