Progress in Color, Colorants and Coatings
Volume:6 Issue: 1, Winter 2013

the current commercial application of ink-jet reactive inks for cotton fabrics has been through pre-treating with pad liquor prior to printing.In this study, an effort has made to provide a single phase ink-jet printing process for printing cotton fabric using the novel cationic reactive dye in ink’s formulation. Cotton fabric was printed with the novel cationic reactive dye and commercial anionic reactive dyes. Color yield and absorbed dye fixations of the printed cotton were analysed at different pH values. The results indicated that printed untreated cotton fabric with cationic reactive dye based ink at optimum pH exhibited higher level of reactive dye fixation than commercial anionic reactive dye based inks on alkali pre-treated cotton fabrics.All reactive dye based inks are demonstrating excellent washing and dry/wet crocking color fastness. The light fastness of each reactive dye based ink fixed to cotton fabrics was moderate.

the stickiness of cotton fiber is a problem in textile spinning process due to contaminated lint adhering to equipment. The degree of stickiness depends on chemical identity, quantity, and distribution of the sugars.The sugar in cotton fibers may be insect- or plant-derived sugar. There are several methods for measuring cotton fibers stickiness. In this work, a colorimetric method is used for the measurements. In the proposed method, honeydew is caramelized by heating cotton fibers, which caused the color of the honeydew to change from pale/colorless to yellow and brown. Heating did not cause any discoloration or change in cotton fibers. Then the yellow index (+b) is used for determining the cotton fibers stickiness. There are high correlation and agreement between results of colorimetric, thermodetector and sugar content method. The conformity between colorimetric and sugar content methods is more than the conformity between colorimetric and thermodetector methods. The colorimetric method is a semi-quantitative and high speed method.

in digital color imaging, it is of interest to transform the color scene of an image to the other. Some attempts have been done in this case using, for example, lαβ color space, principal component analysis and recently histogram rescaling method. In this research, a novel method is proposed based on the Resenfeld and Kak histogram matching algorithm. It is suggested that to transform the color scene between two images, the histograms of the three R, G and B channels of the input image would be matched to the corresponding histograms of the destination one. The performance of the introduced method was investigated for several images. The obtained results indicated that this method is well capable of transforming the color scene between images.

up to now, discoloration of the denim garment has been carried out through various methods including mechanical, chemical, physical and enzymatic treatments. In this study, the nanoclay was co-applied in bio stone washing of denim with cellulase to obtain denim garment with a new look and clear effluent. Acid and neutral cellulases along with nanoclay were applied on the dyed denim fabric with indigo and the properties of the treated sample and the obtained effluent were evaluated. The color changes of the denim fabric were investigated using colorimetric methods. The surfaces of the treated samples and montmorillonite in effluent were observed using SEM and TEM, respectively. According to the results, nanoclay as a new tool along with cellulase caused increasing the lightness, decreasing the back-staining, creating a new look and reducing the remained color in the effluent.

series of novel dichromophoric dyes based on 2-aminobenzothiazoles and 3-amino-1,2,4 -triazole have been synthesized in high yields. All the dyes have been classified as disperse dyes. Besides their electronic spectroscopic properties, high dye-uptakes on polyester, excellent fastness properties, highly extinction coefficients, and broad solvatochromic effects have been observed in these novel disperse dyes. The derivatives of amino triazole were appropriate as pH indicator in the range of 11-13, as well.

tiO2-SiO2 photocatalytic nanostructure film on windshield was prepared via sol–gel dip-coating method for self-cleaning purposes. TiO2 films were prepared on automotive glass pre-coated with a SiO2 layer by a dip-coating method followed by annealing at 500 °C for 30 min. The films were characterized using X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM, FE-SEM) techniques. The TiO2-SiO2 films were transparent, uniform and crack-free and the temperature was best chosen. XRD shows that SiO2 precoated layer comparatively prevent rare elements ions diffusion from substrate to avoid unfavorable compounds. The results illustrate the crystalline anatase as main phase for films annealed at 500 °C with average crystallite size of 22-26 nm, which was preferable due to much higher photocatalytic activity of anatase compared to rutile phase. The FE-SEM surface morphology results indicate that the particle size was 22 nm, whereas some pores observed in the coatings which were due to un-perfect solvent evaporation.

coating performance is greatly influenced by the properties of the wood substrate. This study was focused on evaluating the performance of coatings on both preservative- and thermally-modified wood. A number of commercially formulated semi-transparent stains (Alkyd, Alkyd-Acrylic and PU) were applied on four different types of preservative treated and oil-heattreated wood and their performances were evaluated in natural weathering exposure in Toronto, Canada. The results showed that the treatment enhanced the performance of the coatings. This enhancement occurred by reducing the water uptake by thermal treatment and preservative treatment with chromated copper arsenate (CCA). Even though wood treated with Cu amine-based preservatives had a higher water uptake than untreated wood, the erosion and color change of coating on Cu-amine treated wood was significantly lower than on untreated wood. There were some water-based formulations that had overall better performance than solvent-based coatings on thermally treated wood.