Yanji Zhu,Hongwei Li,Mingliang Zhu,Huaiyuan Wang,Zhenggui Li
Anti-scaling is one key problem in various industrial productions. The coating technology is the most effective protection method for metals and pipelines. As a good scale inhibitor, diethylene triamine penta(methylene phosphonic acid) (DTPMPA) generally takes effect after placement into wastewater and through discharging with water flow. In this study, a novel DTPMPA-modified superhydrophobic anodized aluminium (DSAA) coating was designed, fabricated and utilized for anti-scaling of CaCO 3 deposition. The unique anti-scaling performance on the surface of the DSAA coating originated from the gradual release of DTPMPA at the solution/coating interface, plus the effect of superhydrophobic anti-scaling. During the CaCO 3 deposition, the abundant air layer retained at the surface of the superhydrophobic DSAA coating prevented further deposition of CaCO 3 . In addition, the active DTPMPA gradually and dynamically released from the DSAA coating to the water/coating interface chelated with Ca 2+ and further stopped the possible combination between Ca 2+ and CO 3 2− . This synergistic antiscaling effect of the DSAA coating showed a wide application prospect in effective anti-scaling on various surfaces. This work provides a new way of designing and fabricating dynamic superhydrophobic coatings for anti-scaling.
View large Download slide View large Download slide Close modal Superhydrophobic coatings with excellent self-cleaning performance have attracted significant concerns from researchers. Although various superhydrophobic coatings with prominent superhydrophobic properties have been fabricated, most developed coatings are still inadequate in pipeline scale inhibition applications. In this work, nano-silica (nano-SiO 2 ) was modified by silane coupling of vinyltriethoxysilane (VETS) and 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (PFTS) to prepare a superhydrophobic coating. Organosilicon of PFTS and VETS was grafted onto the surface of SiO 2 for preparing the superhydrophobic coating with low surface energy, and the superhydrophobic coating was cured via poly(vinylidene fluoride) (PVDF). The results showed that the contact angle of the prepared silica-based superhydrophobic coating, denoted as VETS-PFTS@SiO 2 /PVDF, is 159.2°, exhibiting outstanding superhydrophobicity performance. Furthermore, the superhydrophobicity coating also showed satisfactory durability performance in 200 g load wear test after 50 cycles. Importantly, the superhydrophobic coating displayed promising mechanical durability, chemical stability performance, as well as maintained excellent superhydrophobic properties after being placed in water for 3 weeks, indicating the potential for long-term utilization. In the simulated scale inhibition test, it was found that the synthesized coating can also significantly decrease the deposition rate of CaCO 3 and successfully enhance its scale inhibition performance . A self-cleaning VETS-PFTS@SiO 2 /PVDF coating with superhydrophobicity was prepared simply and environmentally. The superhydrophobic product exhibited a good durability and adaptability in air. Contact angle of water on the superhydrophobic surface is more than 155°. The prepared coating has potential application in scale inhibition of pipelines.
危险品化学品经营许可证（带存储）