Nanosols for preparation of antistatic coatings simultaneously yielding water and oil repellent properties for textile treatment

Abstract

This paper reports the preparation of novel nanosol coating solutions for textile treatment which allow the application of coatings yielding antistatic and water/oil repellent properties simultaneously. For this, simple SiO2 sols are modified with both hydrophilic components acting as components responsible for the antistatic properties and with hydrophobic/oleophobic components leading to water and oil repellent properties. Amino-modified alkyltrialkoxysilane N-(2-aminoethyl)-3-aminopropyltrimethoxysilane is used as a hydrophilic component. Alkyl and fluoroalkyl-trialkoxysilanes are evaluated as hydrophobic components. The resulting coating materials will be highly repellent and nevertheless absorb sufficient amount of water guaranteeing antistatic properties. Different coating materials are applied and the repellent properties are investigated by means of contact angle measurements, DuPont test and oil repellence test. Surface resistance is measured to evaluate the antistatic properties and thermogravimetric measurements prove a reversible absorption of humidity of the coating.