In this work, a novel anti-smudge coating system was developed by using hydroxyl-terminated hyperbranched polyester as a coating precursor, mono-hydroxylterminated poly(dimethylsiloxane) (PDMS) as an antismudge agent, and hexamethylene diisocyanate trimer as a curing agent. The resultant coatings with 0.5 wt % PDMS content incorporated are highly transparent and liquid repellent. They exhibit striking repellency against various liquids and display remarkable self-cleaning performance. Water, hexadecane, salt solution, strong alkali solution, strong acid solution, pump oil, and crude oil could slide off the coated surface without leaving any traces, and the dirt on the coated surface could be readily removed by water or oil. Besides, these coatings show potential application for anti-fingerprint and anti-graffiti due to the exceptional repellency of coated surface against artificial fingerprint liquid, oil-based ink, paint, and water-based smudge. Furthermore, they also possess superb chemical shielding ability and thus endow substrates with remarkable protection against exposure to harsh chemical conditions. Moreover, these coatings are mechanically robust against extensive abrasion, impact, and bending without compromising antismudge properties, and they also exhibit excellent adhesion to various substrates. Therefore, these newly developed coatings have tremendous potential for widespread applications.
Smooth particle-free
antismudge coatings show potential for various
applications because they are not prone to the limitations that plague
rough self-cleaning surfaces such as poor durability and transparency.
These smooth coatings are typically prepared from solvent-based precursors
due to their requirement for amphiphobic moieties. We report herein
a facile strategy to prepare from water-based precursors smooth antismudge
coatings that can be readily applied onto various substrates including
metal, wood, paper, and glass. These novel coatings exhibit unprecedented
antismudge properties even with a thickness of only 5.0 ± 0.5
μm and contain only 0.7744 wt % of fluorinated polymer. In addition,
these transparent coatings retain their antismudge properties even
after they are subject to bending, impact, scratching, abrasion, corrosion,
UV irradiation, and thermal shock tests.
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