Functionality of cotton fabrics finished by montmorillonite combined with TiO2
Objective In order to enable multifunctions of cotton fabrics and reduce agglomeration of TiO2 on cotton fabric surface,TiO2/montmorillonite finishing agent was prepared by sol-gel method at lower temperature using tetrabutyl titanate and montmorillonite as the precursor,aiming to reduce agglomeration of TiO2.At the same time,the reduction of TiO2 consumption was fargetted to increase the added value of montmorillonite products.Method TiO2/montmorillonite was firstly synthesized using ultrasound-sol-gel method and then deposited onto the surface of cotton fabrics by two-dipping and two-rolling processes.The properties of the cotton fabric before and after treatment were analyzed using Fourier transform infrared(FT-IR)spectrometer and energy dispersive spectrometer,while the surface morphologies of the cotton fabrics were analyzed by scanning electron microscopy.The whiteness,air permeability,breaking strength and elongation of TiO2/montmorillonite-finished cotton fabrics were measured,respectively.In addition,the performance such as hand feel attributes,softness,smoothness and stiffness were measured.Rhodamine B was used as a test contaminant to qualitatively assess the self-cleaning performance of the TiO2/montmorillonite finished cotton fabric.Results The SEM and EDS results indicated that TiO2/montmorillonite was uniformly distributed on cotton fibers surface.UV-visible diffuse reflectance spectrum result showed that TiO2/montmorillonite finished cotton fabric demonstrated excellent absorption capability to UV light,while the FT-IR result showed that the bonding mode between TiO2/montmorillonite and cotton fiber was formed through covalent bonding.The anti-aging performance test showed that after 96 h UV irradiation,the strength loss of TiO2 finished cotton fabric was 22.9％,while the strength loss of TiO2/montmorillonite finished cotton fabric was 15.4％,indicating that the montmorillonite compound could improve the anti-aging performance of TiO2.The self-cleaning performance test showed that TiO2/montmorillonite finished cotton fabric had satisfactory self-cleaning capability.Nevertheless,compared with raw cotton fabric,the whiteness of TiO2/montmorillonite finished cotton fabric was decreased by 25.8％,the breaking strength decreased by 10.2％,and the air permeability decreased by 5.7％,respectively.Conclusion A cotton fabric with UV protection,anti-aging,and self-cleaning performances was prepared by applying TiO2 and montmorillonite onto the fabric surface using the rolling-baking-baking process.The result indicated that the UVA transmittance,UVB transmittance,and UPF value of TiO2/montmorillonite finished cotton fabric were 1.81％,0.87％,and 100+,respectively.Moreover,the UPF value of the treated cotton fabric was still maintained at 50+after 50 cycles of soap washing,and the fabric's anti-aging performances were increased by 16.7％after post-treatment.Also,the Ti—O—Si bond was formed between TiO2 and montmorillonite,which reduces recombination of electron-hole pairs of TiO2,and effectively controls the TiO2 particle size,thus improving the properties of TiO2 finished cotton fabrics.
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