Water/dust repellent coatings for wood surface from 3-aminopropyltriethoxy silane-quat 188

Abstract

Wetting and dust fouling on wood surface are big problems because of hydroxyl group and static charge on its surface. These problems could be minimized by surface modification which decreasing of hydroxyl groups and increasing of positive charges on wood surface. Many researches were reported about wetting issue but there were few studies directly involved to dust problem. In this research, 3-aminopropyltriethoxy silane (APTES) and 3-chloro-2-hydroxypropyltrimethyl ammonium chloride (Q188) were used to modify hydroxyl groups on wood surface to enhance wetting and dust repellency behavior of wood. The APTES-treated woods (AW) were prepared by immersion solution method and then were used as precursor to treat with Q188 to fabricate APTES-Q188-treated wood (AQW). The modified woods were characterized by SEM, EDX, UV-Vis, FT-IR, Contact angle measurement as well as dust repellent test. The UV-Vis absorbance which related to Ruhemann’s purple and the EDX spectra of Si were observed in all of AW sample which confirmed successful fabrication of APTES-treated wood. The contact angle of modified surfaces was observed that APTES can improve the hydrophobicity and transform wood surface to hydrophobic surface. Meanwhile, increasing of Q188 concentration leaded to improvement of dust repellent but also reduced the hydrophobicity. Therefore, the optimum concentrations of APTES and Q188 were introduced at 0.3A-0.15QA which obtain both of water and dust resistance.