Sol–gel synthesis and characterizations of organically modified silica coatings on knitted cellulose for fixation applications

In order to improve the fixation properties, a novel organically modified silica coating (OMSC) was deposited on knitted cellulose fabric printed with pigment based ink. The organically modified silica sol (OMSS) was prepared by adding tetraethoxysilane (TEOS), γ-glycidoxypropyltrimethoxysilane (GPTMS), ethanol, H2O and HCl. The color fastnesses of knitted fabrics treated with the OMSS were improved significantly. The coating treatment with OMSS (concentration 4–8 wt%) was beneficial to the washing fastness, and the fade rate of washing was reduced more than 50%. The dry and wet rubbing fastnesses were enhanced one or more grades. The scanning electron microscope (SEM) photographs of knitted cellulose fabrics indicated that continuous OMSCs were formed on the fiber surface, which contributed to the washing and rubbing fastnesses. The bending properties of fabric demonstrated that the fixing treatment had slight effect on the handle. These results suggest fixation with OMSS is an effective pathway to improve the color fastness of knitted cellulose fabrics.

► We prepare a novel organically-modified silica coating on knitted cellulose fabric. ► The color fastness is improved if the fabric is coated with modified silica sol. ► Handle is affected slight after the fabric is coated with modified silica sol.