In this report, a people-considered waste-candle soot generated from incomplete combustion of the middle zone of candle was used to coat the glass slide for fabricating the superhydrophobic surface. The candle soot coating surface followed by deposition of methyltrichlorosilane (MTCS) was characterized through field emission scanning electron microscope, contact angle measurement in air and oil, self-cleaning test, high temperature, and corrosive liquid resistance test and water drop impact experiment, respectively. Interestingly, the candle soot layer after deposition of MTCS presented a coral-like structure and exhibited high water contact angle of 161°and a low sliding angle of 3°in air, which demonstrated that it had excellent superhydrophobicity in air. Of course, the coating also exhibited high water contact angle and low sliding angle in oil. Apart from that, results of high temperature and corrosive liquid resistance tests implied that the superhydrophobic coating can keep stability after treatment by high temperature between 100 and 300 °C and can retain high contact angle when encountering the strongly acidic and basic water, which indicated that it exhibited excellent thermal and chemical stabilities. Moreover, the prepared thermally and chemically stable superhydrophobic coating not only displayed wonderful self-cleaning properties in air and oil but also resisted to water drop impaction after deposition of MTCS, which interconnected the carbon particles via the hydrolysis of MTCS in air. In summary, we provided a fast and cost-efficient method to prepare the superhydrophobic coating with excellent thermal and chemical stabilities, which showed great potential in application of antifouling materials under the high temperature and corrosive condition.

Herein, a simple spraying method was applied to prepare a novel robust superhydrophobic coating containing fluorinated hyperbranched polyurethane (F-HPU) resin and lanthanum oxide (La 2 O 3 ). The composite coating had the maximum water contact angle (WCA) of 157°a nd low sliding angle (SA) of 5.5°when the content of La 2 O 3 was 17%. Moreover, the composite coating can resist abrasion with sand paper for 80 cycles, which might be the reason that La 2 O 3 particles adhered strongly on the substrate by the F-HPU resin with strong adhesion. Furthermore, the novel robust superhydrophobic coating can be applied in various substrates, resist water stream impact, and remain clean after being fouled by contamination in air and oil. Accordingly, the novel robust superhydrophobic coating has potential application in protection-needed materials. Meanwhile, we also provide a new application field for rare earth metal oxides and an alternative strategy for robust self-cleaning coatings.

A series of novel hyperbranched poly(urethane–imide)s (HBPUIs) was synthesized and derived from as-prepared imide-containing glycol and commercial materials via an A2 + B2 + B3 approach. The chemical and morphological structures of the resulting polymers were evaluated by infrared attenuated total reflection and X-ray diffraction techniques, respectively. Compared with pure HBPU, HBPUIs exhibited better thermal stability with the 10% weight loss temperature of 282–298°C under nitrogen atmosphere, good mechanical property with the tensile strength of 2–19 MPa, and elongation at breaks of 461–896%. Moreover, optical transmissivity of all films was measured and the results showed that they had excellent transparency in the scope of visible light. Meanwhile, the cutoff wavelengths of as-prepared HBPUI films were at around 350 nm, which can block the whole ultraviolet (UV)-C (200–280 nm) and UV-B (280–320 nm), as well as a part of UV-A (320–400 nm). Furthermore, the designed photocatalytic degradation experiment of the methylene blue (MB) confirmed that HBPUI films had good UV-shielding performance with 70% degradation of MB after intense UV irradiation (400 W) for 50 min under the protection of HBPUI film with 14% imide-containing glycol. This endowed HBPUIs with potential applications prospect in UV-shielding materials.