水性壓克力／蒙脫土奈米複材製備及其防蝕研究

Preparation and Anti-Corrosion Property of Water-borne Acrylic Resin/Montmorillonite Clay Nanocomposite

此研究主要是採用直接混合方式將蒙脫土懸浮水溶液與水性樹脂直接攪拌混合，成功製備出水性壓克力／蒙脫土奈米複材，其中蒙脫土懸浮水溶液部分分別採用經親油性改質與未經改質兩種。所製備的複合材之蒙脫土分散行為經TEM觀察顯示都為奈米級分散。其中改質蒙脫土／樹脂奈米複材的TEM照片顯示仍有多數插層結構；而未改質蒙脫土與水性樹脂直接混合所得水性壓克力／蒙脫土奈米複材，在TEM照片中顯示蒙脫土是以完全脫層方式分散於樹脂中。此奈米複材薄膜（50 µm）經實驗發現均能隨蒙脫土含量增加而大幅降低氧和水分子滲透性，同時電化學腐蝕實驗結果也顯示隨蒙脫土含量增加能大幅降低腐蝕速率的結果。

Two series of polymer-clay nanocomposite (PCN) materials that consisted of water-borne acrylic resin and layered montmorillonite (MMT) clay were prepared by direct mixing of acrylic latex and aqueous MMT clay dispersion, in which the organophilic modified clay and the unmodified clay were used. The PCN materials were examined by wide-angle X-ray diffraction and transmission electron microscopy, both the intercalation and the exfoliation dispersion structure were found in the organophilic modified clay/polymer nanocomposites, but the unmodified MMT clays were found to be dispersed with exfoliation structure in resin matrix. In the molecular permeability analysis, the oxgen and water permeability of these PCN coating films (50 m) were found to decrease with the increasing of clay amount. The corrosion rate of these PCN coatings on the cold-rolled steel were also found to decrease with the increasing of clay amount in the electrochemical corrosion study.