TEOS/OTMS超疏水涂层的制备及形成机制

李文洋, 尹晓彤, 张鹏宇, 和法起, 冯立明

doi:10.16577/j.issn.1001-1560.2022.0286

材料保护 >

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

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

工艺探讨

TEOS/OTMS超疏水涂层的制备及形成机制

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(1.山东建筑大学材料科学与工程学院，山东济南 250101;2.泰安乐邦环保科技有限公司，山东泰安 271208)

冯立明(1965-)，教授，硕士，主要从事清洁表面处理技术、固废资源化利用等领域教学与研究，电话:13153174310，E-mail:flm@sdjzu.edu.cn

收稿日期: 2022-04-25

修回日期: 2022-05-16

录用日期: 2022-06-21

网络出版日期: 2023-12-23

基金资助

山东省重点研发计划(重大科技创新工程)(2019JZZY020312)资助

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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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摘要

以正硅酸乙酯(TEOS)和正辛基三甲氧基硅烷(OTMS)为原料，采用溶胶-凝胶法制备了TEOS-OTMS溶胶，分别在光滑玻璃基体、刻蚀玻璃基体上，通过一步浸渍提拉法制备了疏水涂层，研究了水解时间对涂层疏水性能和硬度的影响，提出了TEOS-OTMS溶胶与疏水涂层形成机制。结果表明：TEOS-OTMS原位水解-聚合可以制备以SiO2颗粒为胶核，辛基硅烷包覆的胶体粒子，在玻璃基体形成辛基链修饰的低表面疏水膜层，当TEOS预水解聚合4 h，TEOS-OTMS共水解聚合20 min时，涂层疏水角达到(124.01±2.00)°，铅笔硬度达到6 H。利用扫描电子显微镜对微观结构进行分析，玻璃基体通过刻蚀形成间距6.36 nm、平均大小16.75 nm的微观凸起，使TEOS与OTMS的缠结、聚集增强，涂层形成了150～200 nm的孔隙，这种“微观粗糙”是形成超疏水涂层的关键，TEOS-OTMS涂层疏水角达到(160.08±2.00)°。

关键词： 超疏水涂层; 正辛基三甲氧基硅烷; 正硅酸乙酯; 硅烷膜; 溶胶-凝胶法

本文引用格式

李文洋, 尹晓彤, 张鹏宇, 和法起, 冯立明 . TEOS/OTMS超疏水涂层的制备及形成机制[J]. 材料保护, 2022 , 55(10) : 123 -129 . DOI: 10.16577/j.issn.1001-1560.2022.0286

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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