Jiangsu Baihe Coatings Co.

Changzhou, China

Jiangsu Baihe Coatings Co.

Changzhou, China

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Yang X.,Beihang University | Zhu L.,Beihang University | Zhang Y.,Beihang University | Chen Y.,Beihang University | And 3 more authors.
Applied Surface Science | Year: 2014

The fluorine-modified acrylate resin was synthesized by solution radical polymerization using dodecafluoroheptyl methacrylate (DFMA) and other acrylate monomers. The same weight of DFMA was added into the reaction through two different ways: (1) adding DFMA as bottom monomer (AFBM); (2) adding DFMA drop by drop (AFDD). The different coatings were prepared by blending the fluorine-modified acrylate resin with the curing agent. Compared with AFDD coating, the AFBM coating exhibited better self-cleaning ability which was confirmed by the self-cleaning test through measuring the specular gloss of coatings before contamination and after water droplets flushing. The fluorine content at the surface of AFBM coating increased from 15.1 at.% to 23.1 at.%, while the water contact angles increased by 8 and the sliding angles decreased obviously. Furthermore, the contact angles and self-cleaning ability of the coatings prepared with DFMA through two adding ways both decreased after scrubbing by wet cotton because of the decrease of the surface fluorine atom content. It could be concluded that high contact angles and low sliding angles were advantageous for coatings to obtain excellent self-cleaning ability. © 2014 Elsevier B.V. All rights reserved.


Yang X.,Beihang University | Zhu L.,Beihang University | Chen Y.,Beihang University | Bao B.,Jiangsu Baihe Coatings Co. | And 2 more authors.
Applied Surface Science | Year: 2016

Controlling surface wettability is an important road to afford the materials with anticipated functional properties, such as anti-fogging, anti-icing and self-cleaning. Manipulating the surface topography and chemical composition is a promising strategy to achieve the expected functional properties. Herein, we concurrently realized the control of surface topography and chemical composition of the film materials via exploiting a simply one step method through the hydrolysis and condensation of tetraethoxysilane (TEOS) to form silica sol-gel films. By adjusting the amount of water, TEOS and basic catalyst, the hydrophilic or hydrophobic chemical groups on the silica particles surface were well controlled. As a result, the sol-gel silica films exhibiting a controllable and wide range contact angles from 7.7 ± 1.5° to 121.6 ± 1.8° were obtained by this simple one-step method. The inorganic nonmetallic, metallic and polymer materials surface could maintain different wettability by the modification of controlled wettability silica films. Furthermore the wettability of silica film could be easily changed from hydrophobicity to superhydrophilicity through a heat-treatment due to the decrease of hydrophobic chemical groups conforming to the time-temperature equivalence principle. Raising temperature and extending holding time were equivalent to chemical bond breaking which result in the wettability change of silica films. © 2016 Elsevier B.V. All rights reserved.


Yang X.,Beihang University | Zhu L.,Beihang University | Chen Y.,Beihang University | Bao B.,Jiangsu Baihe Coatings Co. | And 2 more authors.
Applied Surface Science | Year: 2015

A hydrophilic silicon dioxide film which was prepared by silicon dioxide sol could be coated on the acrylate polyurethane coating and translate the wettability of the coating from hydrophobic (CA = 85°) to hydrophilic (CA = 16°). The silicon dioxide sol was prepared by hydrolyzing tetraethoxysilane (TEOS) in aqueous medium and formed a hydrophilic film on acrylate polyurethane surface at 60 °C. The concentration of silicon dioxide sol influenced the film wettability and the hydrophilicity was studied by static contact angle and sliding angle measurements. It was observed that with increase in the ratio of the water/silicon dioxide sol from 0:1 to 3:1, the contact angle decreased from 35° to 16° and the sliding angle decreased obviously. Compared with hydrophobic acrylate polyurethane coating, the hydrophilic silicon dioxide film exhibited better self-cleaning ability which was confirmed by the self-cleaning test through measuring the specular gloss of coatings before contamination and after water droplets spray. Furthermore, there was little dust left on the hydrophilic silicon dioxide film after exposed to an outdoor environment for ca. 50 days. © 2015 Elsevier B.V. All rights reserved.

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