The fatty acids based organofunctional silane protective coatings for concrete

Abstract

The possibility of using free fatty acids for the synthesis of new organofunctional silanes is shown. In nature, fatty acids occur in the form of esters with glycerin (fats) and are widely used for production of soap, oil paints, medicines and cosmetics. Of particular interest in this study was the application of organosilicon derivatives of oleic acid for production of coating that would cover the surface of concrete and protect it from water permeation. As a result of proposed silanization, the concrete surface acquired hydrophobic character with the wetting angles up to 115°, and the concrete absorbability was reduced by up to 93%.

Fluorocarbosilane-Based Protective Coatings for Concrete

“…It should be noted that similar crystallites on the concrete surface were not observed in the case of silanization with the use of octyltriethoxy resin [ 37 ]. On the other hand, in the case of silanization with organosilicon derivatives of fatty acids, shapeless silicate structures were formed on the concrete surface (identification based on EDS mapping) [ 9 ].…”

“…Silicone resin adheres well to the substrate through chemical bonds and repels surface water [ 8 ]. The alkalinity of concrete acts as a catalyst in this reaction [ 9 ].…”