PROGRESS IN COLOR, COLORANTS AND COATINGS
Year:2016 | Volume:9 | Issue:1 |Papers Count:6

The aim of this study research is to present the idea of the level of the research the research being done in the area of eco-friendly dyeing of cotton. This research discusses cotton and its polymer structure at first and then the properties of cotton fiber. This paper also briefly describes the terminology of dyeing. It is followed by the consequences of dyeing and its hazards on the environment. The technological development for the reactive dye structure, dyeing machines, dyeing process, chemical modification and alternative dyeing auxiliaries have also been discussed. Prog. Color Colorants Coat. 9 (2016), 61-70 © Institute for Color Science and Technology.

In the current study, silica aerogel-eggshell was synthesized and characterized as nano-adsorbent for dye removal from colored wastewater. The nanocomposite structure was characterized by Fourier transform infrared spectra and scanning electron microscope. The ability of adsorption silica aerogels-egg shell nanocomposite for removal of basic violet 16 dye from aqueous solutions was studied using batch adsorption system and compared with two other adsorbents such as egg shell and silica aerogels. The results showed that adsorption power of basic violet 16 dye increased by silica aerogels-egg shell nanocomposite. The adsorbents were evaluated for removal of dye under different pH values, temperatures, adsorbent dosages and contact times. The optimum pH for dye removal by nanocomposite was 8, while the optimum pH for the two other adsorbents of basic violet 16 was about 12. The optimum temperature and adsorbent dosage for dye removal was 35° C and 5g/L, respectively. Eventually, the equilibrium was achieved for the dye removal after 90 min of contact time. In order to better understand the adsorption process, the experimental data were analyzed with Langmuir and Freundlich isotherm models and it was discerned that synthesized adsorbents were well fitted by Freundlich equation. Prog. Color Colorants Coat. 9 (2016), 1-16 © Institute for Color Science and Technology.

Model selection of nano and micro droplet spreading can be widely used to predict and optimize of different coating processes such as ink jet printing, spray painting and plasma spraying. The idea of model selection is beginning with a set of data and rival models to choice the best one. The decision making on this set is an important question in statistical inference. Some tests and criteria are designed to answer to this question that which of the rival models is the best one. The purpose of this article is to propose a new interval say tracking interval for comparing the two rival models and examine its suitability in the spread data of carbon nanotubes coating. The proposed interval can be used for non-nested or nested models and whether both, one or neither is mis-specified. An important implication of the present study is that if the rival models are really close, then the proposed interval can be determined the equivalent models under censored data. Prog. Color Colorants Coat. 9 (2016), 17-28 © Institute for Color Science and Technology.

In order to make use of the reflectance behavior of woodland colors to produce dark brown in the UV-VIS-NIR bands, two colored pigments were used to print cotton/polyester (Co/PET) goods. Inorganic nanoparticles of TiO2, ZnO and Al2O3 were also loaded in the printing formulation. The reflectance profile of treated samples was studied using Jasco V-670 reflectance spectrophotometer. The effect of inorganic nanoparticles on rubbing, light and washing fastnesses as well as wettability and air permeability of printed samples were investigated. Tuning the reflectance curve of dark brown shade was successfully applied using colored pigments along with the nanoparticles. The results indicate that the presence of TiO2 and ZnO nanoparticles in load of 0. 25-1 g/kg in printing pastes made significant changes in the behavior of IR band, though only a slight change in visible reflectance of printed fabrics was found. The samples containing nanoparticles showed great fastness levels in washing, rubbing and light fastness experiments and a considerable increase in wettability of printed fabrics. Furthermore, air permeability of printed fabrics containing nanoparticles was superior to samples printed without nanoparticles. Prog. Color Colorants Coat. 9 (2016), 29-40 © Institute for Color Science and Technology.

In this study, novel UV curable conductive nanocomposites containing urethane acrylate (UA) and polyaniline (PANi)-Co3O4 nanocomposites were fabricated. At first, PANi-Co3O4 nanocomposites have been synthesized with different molar ratios of aniline: Co3O4 nanoparticles by in situ chemical oxidative polymerization method of aniline using ammonium persulphate as an oxidizing agent. Afterward, PANi-Co3O4 nanocomposites were dispersed in UA matrix and cured by UV irradiation. Structural, optical properties, electrical conductivity and morphological characteristics of the nonocomposites were analyzed by FT-IR and UV-Vis spectroscopy, electrical conductivity measurements and scanning electron microscopy (SEM), respectively. FT-IR, UV– VIS spectra offered the information about chemical structure of the products. The SEM images of the PANi-Co3O4 nanocomposites showed uniform distribution of Co3O4 nanoparticles in PANi matrix. Also SEM images of the PUA-PANi-Co3O4 nanocomposites films showed distribution PANi-Co3O4 nanocomposites in PUA matrix. Electrical conductivity measurements of PANi-Co3O4 nanocomposites revealed that the conductivity of PANi decreased with adding Co3O4 nanoparticles in contrast to the conductivity of PUA which increased with adding PANi-Co3O4. Prog. Color Colorants Coat. 9 (2016), 41-52 © Institute for Color Science and Technology.

In this paper, the corrosion behavior of the filled epoxy paint with the rice husk ash (RHA) on steel substrates in two different corrosive environments (natural sea water and 2M sulfuric acid) has been studied. Electrochemical impedance spectroscopy (EIS) was used to evaluate protective properties of different organic coating systems due to the different filler composition. RHA was prepared by heating rice husk at 700º C for 3hours. By adding RHA, as a new and natural filler, to the epoxy paint, the resistance to penetration of the solution was increased in both environments. The best filler for the sea water was the white RHA (contained more silica) in 20% wt. due to increasing the corrosion resistance for 3 times with respect to the unfilled epoxy paint. The black RHA (contained more carbon) increased the corrosion resistance of the epoxy paint in sulfuric acid when added in 20% wt. Prog. Color Colorants Coat. 9 (2016), 53-60 © Institute for Color Science and Technology.