Phosphorus-Silica Sol-Gel Hybrid Coatings for Flame Retardant Cotton Fabrics

Abstract

This work investigates the use of organic-inorganic sol-gel coatings based on silica and phosphorous compounds for providing cotton fabrics with fl ame retardant features. To this aim, diethylphosphatoethyltriethoxysilane precursor was employed for the synthesis of several sols in combination with diff erent chemical additives. Sols were reacted with azo-based compounds and repeatedly applied onto the cellulosic substrate in a multilayer assembly, aiming at assessing the eff ect of the concurrent presence of Si, P and N on the overall fi re behaviour of the fabric. In order to evaluate the fl ame retardancy of treated cellulosic fabrics, fl ammability tests were carried out. The obtained results showed that the phosphorus-silica coating is able to promote the formation of a stable char that acts as insulator barrier. Finally, an additive P-N eff ect of the ceramic oxide coating in terms of increased residue and decreased heat release rate and total burning time was observed in cone calorimetry tests. Keywords: thermal stability, cellulosic fabric, sol-gel, diethylphosphatoethyltriethoxysilane, hybrid material Si, P in N vpliva Izvleček V prispevku je raziskana uporaba organsko-anorganskih premazov sol-gel na podlagi silicijevih in fosforjevih spojin, s katerimi bi bombažnim tkaninam zagotovili odpornost proti gorenju. Za ta namen je bil uporabljen prekurzor dietil-fosfatoetil-trietoksisilan za sintezo različnih solov v kombinaciji z različnimi kemičnimi aditivi. Soli, ki so reagirali z azo-spojinami, so bili v več plasteh nanešeni na celulozni substrat z namenom ugotoviti, kako sočasna prisotnost

Organofunctional Trialkoxysilane Sol-Gel Precursors for Chemical Modification of Textile Fibres

“…e ame retardant mechanism of OAH precursors has been the most comprehensively studied on cellulose bres, but it has been rarely studied on other bres. In the case of cellulose bres, all of the examined ame retardant hybrids decreased the starting thermo-oxidative decomposition temperature and promoted dehydration and formation of the crosslinked aliphatic char, which was thermally more stable compared to that of untreated cellulose [14,78,80,83,84,86]. e formed char protected the underlying cellulosic material, therefore reducing the weight-loss percentage and rate during the rst decomposition stage and shi ing further degradation towards higher temperatures compared with untreated cotton due to an enhanced aromatisation e ect.…”