Institute for Color Science and Technology (ICST)Progress in Color, Colorants and Coatings2008-21347320130701Synthesis and Characterization of Anionic Polyurethane Dispersants for Waterborne Paints1471547583510.30509/pccc.2013.75835ENF.NajafiDepartments of Resin and Additives, Institute for Color Science and TechnologyB.Shirkavand HadavandDepartments of Resin and Additives, Institute for Color Science and Technology0000-0001-7809-7330F.ManouchehriDepartment of Chemistry, Damghan Branch, Islamic Azad UniversityJournal Article20121210Anionic polyurethane dispersants APUDs were used as dispersing agents in formulation of waterborne paints. The APUDs were synthesized by three steps. In the first step, macromonomer diisocyanate having carboxylic acid was prepared by isophorone diisocyanate IPDI, dimethylol propionic acid DMPA in presence of acetone as solvent and dibutyltin dilaurate DBTDL as catalyst. Then, carboxylic polyurethane was prepared by reaction macromonomer diisocyanate having carboxylic acid groups with alcohols. In this work, alcohols were 1,4-butanediol and 1,6-hexanediol as difunctional alcohols, trimethylol propane as trifunctional alcohol and pentaerythritol as tetrafunctional alcohol. The final step involved neutralization and dispersion in water, where acidic polyurethane was neutralized by the addition of triethylamine TEA. The polymers have been characterized with 1H-NMR and FT-IR. The dispersion of APUDs depends on their molecular weights and chemical structures. Dispersion of titanium dioxide in typical waterborne acrylic resin has been investigated.Institute for Color Science and Technology (ICST)Progress in Color, Colorants and Coatings2008-21347320130920Synthesis, characterization, and textile application of novel disperse dyes1551637583310.30509/pccc.2013.75833ENH.Yousefpour NavidFaculty of Textile Engineering, Amirkabir University of TechnologyK.GharanjigCenter of Excellence for Color Science and Technology,Department of Organic Colorants, Institute for Color Science and Technology0000-0002-0115-3557M.AramiDepartment of Textile Engineering, Amirkabir University of TechnologyJournal Article20130422In this paper, two novel alkali clearable disperse dyes were synthesized. 4-flourosulfonyl aniline and 2-nitro-4-flourosulfonyl aniline were utilized as the diazo components and 2- naphthol as the coupling component. The DSC, FTIR, 1HNMR and UV-Vis analyses were used to characterize the synthesized intermediates and dyes. The synthesized dyes were used to dye polyester fibers and their dyeing properties were studied. In addition, hydrolysis kinetic of the synthesized dyes in alkali media was studied. The results showed that the synthesized dyes have good properties on polyester fabrics. Hydrolysis of the synthesized dyes in alkaline media provides the replacement of reduction clearing process by alkali-clearing process. The elimination of sodium hydrosulphite will cause reduction of environmental pollution. The advantage of replacement of reduction clearing-method by alkali-clearing process will cause the prevention of producing toxic and carcinogenic compounds.Institute for Color Science and Technology (ICST)Progress in Color, Colorants and Coatings2008-21347320131020A Study of Relationship Between Color Inconstancy Level and CIELAB Color Coordinates1651757583210.30509/pccc.2013.75832ENM.SafiDepartment of Color Physics, Institute for Color Science and TechnologyJournal Article20130422In commercial point of view, it is of great interest to find colors with high color constancy level. Color constancy as a relatively property of object’s appearance could be affected by different factors. In this article, the color inconstancy index of CMCCON02 and CIELAB color coordinate of 1269 samples of Munsell at CIELchº color system to study any correlations, was calculated. The corresponding color under four illuminants A, TL84, and a white LED as well as an equal energy spectrum was determined. The results showed the variation of the hue angle and the chroma makes more sensible effect on the color inconstancy index CMCCON02 than the lightness. In addition, a specific proportional change in spectral reflectance curve between low and high wavelength limits maybe force the color to be more inconstant. Besides color inconstancy showed that depends primarily on type of color and used illuminant pair.Institute for Color Science and Technology (ICST)Progress in Color, Colorants and Coatings2008-21347320131105Photo-oxidative Stability of a Series of Red Acrylic Paints1771857583410.30509/pccc.2013.75834ENM.Bagherzadeh KasiriFaculty of Applied Arts, Tabriz Islamic Art UniveristyA.Nemati BabaylouH.KARIMIFaculty of Applied Arts,Journal Article20130925Photo-oxidative stability of a series of most common red acrylic paints has been investigated. The paints in question were carmine, quinacridone scarlet, alizarin crimson, brilliant red, vermilion and cadmium red hue. Structural changes, discoloration and weight loss of paints film subjected to UV irradiation in an accelerated ageing chamber were measured using FT-IR spectroscopy, colorimetry and gravimetric analysis before and after 400, 800 and 1200 hours of irradiation. The results of FT-IR spectroscopy showed that cadmium, quinacridone scarlet, primary magenta and vermilion involved most structural changes, where the reduction of transmission peak at 2900 cm-1 region symmetric stretching of C-H bond was noteworthy. Colorimetric measurements indicated the reduction in the absorption of visible light due to photo-degradation of the pigment structure. Furthermore, alizarin crimson and brilliant red have undergone more weight loss compared to the others, which was a result of rapid formation of VOCs.Institute for Color Science and Technology (ICST)Progress in Color, Colorants and Coatings2008-21347320131120Evaluation of anticorrosion behavior of automotive electrocoating primers by the AC-DC-AC accelerated test method1871997583110.30509/pccc.2013.75831ENS.Lajevardi EsfahaniSurface Coating and Corrosion Department, Institute for Color Science and TechnologyZ.RanjbarSurface Coating and Corrosion Department, Institute for Color Science and TechnologyS.RastegarPolymer Engineering and Color Technology Department, Amirkabir University of TechnologyJournal Article20130323A protective coating has been applied onto the phosphated panels using cathodic electrocoating in two different dry film thickness namely 8µm and 20µm. The corrosion resistance of cathodic electrocoatings has been studied using AC/DC/AC method. Twelve cycles of AC/DC/AC test were carried out on each sample which the DC voltage of the first 6 cycles were -4 V VS. Ag/AgCl @ 20 minutes followed by 6 more cycles at -4V for two hours. Electrical current density and bode plotes of samples were investigated during the carried AC/DC/AC test. The results showed that by decreasing the thickness of electrocoating, the barrier properties of film were declined drastically. Also, applying DC potential for a longer time 2 hours prepared harsh condition for degradation of coating. The sample with normal thickness 20µm has failed after 6 cycles although the sample with lower thickness 8µmhas failed only after 3 cycles.Institute for Color Science and Technology (ICST)Progress in Color, Colorants and Coatings2008-21347320131120“Study of stable gallium oxide heavey metal Ga2O3-Bi2O3-PbO system glasses proposed as a base for optically noble glazes and enamels”2012127583010.30509/pccc.2013.75830ENH.Ahmadi MoghaddamDepartment of Inorganic Pigments and Glazes, Institute for Color Science and TechnologyJournal Article20130807Ultra optical glasses are proposed for attaining noble glazes of high reflection and shine. In addition, these glasses can be used as semi-mirrors and optical instruments. In this reseach attempts were devoted mainly to introduce a glass system with the highest possible refractive index in which the highest reflection is desirable. Thus different amounts of heavy metal oxides modifiers, such as PbO and Bi2O3 were compounded with Ga2O3, as a glass former, and were melted to determine the stable glass regions in the corresponding three oxide glass system. Results suggested the most stable glasses were located in the eutectic region of the above oxides three phase diagram, where the melting was as low as 900OC. DTA measurements presented glass stabilities as the highest differences between the glass crystallinity and transition temperatures, `Tc-Tg`. Glass samples were moulded, cut and shaped into prisms, rods and narraw slides accuratly as required for the ultra optical propeties measurements by “Minimum angle of diviation of light in a prism” method. Refractive indices above 2.447 for yellow spectrum of 574 nm were achieved, i.e. higher than that reported for diamonds, i.e. 2.417. Dispersion property, as Abbe Number, was as low as 10 for the lowest content Ga2O3. Referring to the transmission bands in theses glasses, they could perform good optical nonlinearity, and be applicable in optical switching instruments.Institute for Color Science and Technology (ICST)Progress in Color, Colorants and Coatings2008-21347320131220Acrylic resin derivatives as modifier for potassium silicate binder in zinc-rich coatings: electrochemical studies2132257582910.30509/pccc.2013.75829ENI.Mirzaie GoodarziAbadan Faculty of Petroleum Engineering, Petroleum University of TechnologyM.FarzamAbadan Faculty of Petroleum Engineering, Petroleum University of TechnologyM. R.ShishesazAbadan Faculty of Petroleum Engineering, Petroleum University of TechnologyD.ZaareiTechnical Faculty, South Tehran Branch, Islamic Azad UniversityJournal Article20130805Water based inorganic alkali silicate binder of zinc rich primer was modified by adding acrylic resin derivatives. Several series of primer coatings were formulated by adding 5, 10 and 15 wt of acrylic and acrylic/styrene copolymer to potassium silicate binder and used as binder in zinc rich coatings. The formulated primers were applied on low carbon steel plates and the corrosion protection properties of these primers were evaluated by electrochemical impedance spectroscopy EIS, corrosion potential measurements, salt fog test and scanning electron microscope SEM. The results indicated that the addition of 5 acrylic/styrene copolymer and/or 10 acrylic resin into the inorganic silicate binder led to improvement of corrosion protection performance of formulated primers.