Water-Repellent Thin Film with High Alkali Resistance Using the Sol-Gel Method for Ink Jet Printer Head(Surfaces, Interfaces, and Films)

概要

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Water-repellent thin films from silane coupling agents have been widely used for inducing hydrophobicity on various surfaces. However, films obtained by conventional methods have poor durability against alkaline solutions. A new water-repellent thin film with high alkali resistance has been obtained for the first time by the sol-gel method using fluoroalkylmethoxysilane and 1,4-bis (trimethoxysilylethyl) benzene (BTB). The film maintained its hydrophobicity after soaking in alkaline ink with pH=8.9 at 70℃ for 500h. While the film maintained alkali resistance after being heat-treated at temperatures up to 300℃, that heat-treated at 400℃ lost its alkali resistance. Fourier transform infrared measurements of the film indicated that ethyl groups in BTB molecules burn or oxidize at 400℃. It is speculated that the ethyl groups in the vicinity of siloxane bonds and the three-dimensional BTB polymer network prevent OH^-ions from approaching and breaking the siloxane bonds in the film, and thus the film has high alkali resistance. We demonstrate that the new water-repellent film is applicable to the ink jet printer head.
社団法人応用物理学会の論文
2002-06-15