Preparation of superhydrophobic coating on glass surface with alkali catalyzed polymethylhydrosiloxane
PANG Xiao-qin1, FANG Zhou1, HE Yan1,2, CUI Xue-min1,2
1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China; 2. Guangxi Key Lab of Petrochemical Resource Processing and Process Intensification Technology, Nanning 530004, China
Abstract: A superhydrophobic coating with self-cleaning function is prepared by activating glass surface with KOH concentration of 1 mol·L-1, 5 mol·L-1 and 10 mol·L-1, respectively, and through alkali catalyzed hydrolysis and condensation of polymethylhydrosiloxane (PMHS). It is found through SEM observation that the superhydrophobic coating has the best performance when the modification has been carried out under a KOH concentration of 10 mol·L-1 at 120℃ for 2 h. The reaction mechanism of PMHS is analyzed by FT-IR, XPS, SEM, and EDS. It is shown that OH- can destroy the crystal lattice of glass to expose active —OH sites on the surface, and can catalyze the hydrolysis of PMHS molecules to generate a large number of active —Si—OH. Chemical condensation undergoes between these two active groups to graft PMHS monomer onto glass surface, and then PMHS monomers self-polymerize to form micro-nano fiber coating. The superhydrophobic interface prepared by this method has a contact angle of 168° and a light transmittance of 91%, which has strong acid resistance, wear resistance and self-cleaning properties.
庞筱琴, 方洲, 贺艳, 崔学民. 玻璃表面碱催化甲基含氢硅油制备超疏水涂层的研究[J]. 现代化工, 2021, 41(8): 86-90,95.
PANG Xiao-qin, FANG Zhou, HE Yan, CUI Xue-min. Preparation of superhydrophobic coating on glass surface with alkali catalyzed polymethylhydrosiloxane. Modern Chemical Industry, 2021, 41(8): 86-90,95.
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