Surface Coating on Cellulose Fabrics with Nonionic Dyes - silica Hybrids

Coatings obtained on cellulose fabrics with nonionic dyes silica hybrids have been investigated. Composition of the impregnation bath and parameters having a major influence on coloring properties were studied in relationship with washing and light fastness. It was found that cotton can be coated with organic-inorganic nonionic dyes - silica hybrids exhibiting fair washing and light fastness. Properties of the coated materials can be controlled by variation of parameters affecting sol obtaining procedures or impregnation conditions. The presence of only one trialkoxysilane group per chromogen makes the formation of a highly crosslinked silica network to be difficult. The partial condensation of DR1-PTES (Disperse Red 1 dye covalently linked to 3-isocyanatopropyltriethoxysilane) to the stage of oligorneric structures, together with the existence of silanol and unhydrolyzed alkaxysilane groups can explain leaching behavior of the coatings obtained with this type of hybrid materials.