The Effect of Selected Pretreatments on the Dyeing and Color Properties and pH-Sensitivity of Wools Dyed with Metallized Azo Dyes

1977 ◽  
Vol 47 (1) ◽  
pp. 18-24
Author(s):  
Howard L. Needles
Keyword(s):  
Azo Dyes ◽  
Ph Sensitivity ◽  
Sodium Dichromate ◽  
Color Properties ◽  
Dyeing Properties ◽  
Phosphonium Chloride ◽  
Cuprous Sulfate ◽  
Color Differences ◽  
Azo Group

The effect of tetrakis(hydroxymethyl)phosphonium chloride (THPC) and peroxydisulfate (PS) anion pretreatments on the dyeing properties of wool with metallized azo dyes was studied and characterized. Chrome-metallized azo dyes containing pyrazolone or acetoacetanilide moieties dyed THPC and PS-treated wools to different shades than those found for untreated wool, whereas treated and untreated wools dyed with chrome-metallized azo dyes containing aromatic benzenoid rings on both sides of the azo group gave much smaller color differences. The particular mordant used did not significantly affect the nature of color differences observed when treated and untreated wools dyed with mordant dyes containing a pyrazolone moiety were metallized; however, the pH-sensitivity of the mordant-dyed wools was reduced by metallization, with sodium dichromate and cuprous sulfate metallization providing the greatest degree of stabilization.

Depression Performance of Azo Dyes to Sulfide Minerals

2011 ◽  
Vol 287-290 ◽  
pp. 3074-3080
Author(s):  
Li Hong Lan ◽  
Jian Hua Chen ◽  
Ping Lan ◽  
Mei Lian Liang ◽  
Ye Chen
Keyword(s):  
Azo Dyes ◽  
Sulfide Minerals ◽  
Frontier Molecular Orbital ◽  
Azo Compounds ◽  
Orbital Energy ◽  
Energy Calculation ◽  
Mineral Surfaces ◽  
Good Adhesion ◽  
Azo Compound ◽  
Azo Group

Azo dyes have strong hydrophilic and good adhesion to solid surface. In this study, 23 kinds of typical azo compounds were tested as depressant of sulfide minerals. Absorption of azo compound on mineral surfaces was detected by UV. The result shows that some of them can be good depressants of single sulfide minerals. With the number of azo group increasing from 1 to 3, depression performances are improved. On the other hand, depression performances of azo dye are related to the type of group and the location of phenyls，the results of adsorption and the frontier molecular orbital energy calculation may be used to explain depression performances of azo dyes.

Development of novel pH-sensitive azo dyes from Cardanol as a bioresource

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Siddhesh Umesh Mestry ◽  
Umesh Ratan Mahajan ◽  
Aswathy M. ◽  
Shashank T. Mhaske
Keyword(s):  
Azo Dyes ◽  
Azo Dye ◽  
Density Functional ◽  
Ph Sensitivity ◽  
Water Soluble ◽  
Hydroxyl Group ◽  
Disulfonic Acid ◽  
Colour Properties ◽  
Content Type ◽  
Good Thermal Stability

Purpose The purpose of this paper is to use the bio-based resource as the starting material for the synthesis of azo dye. Cardanol is one of the most used bio-based resources for carrying out the synthesis of various compounds having numerous end applications. The study presents an attempt to develop an azo dye from Cardanol having end applications in pH-responsive dyes. Design/methodology/approach The cardanol was sulfonated to block the para position by which ortho positioned hydroxyl group after diazotization and coupling will provide necessary pH-sensitivity. The diazotization of two naphthalene derivatives, i.e. 1-naphthol-8-amino-3,6-disulfonic acid (H-acid) and 7-amino-4-hydroxy-2-naphthalene sulfonic acid (J-acid) was carried out using the standard practice, and the diazotized compounds were coupled with the sulfonated cardanol. The obtained dyes were characterized by Fourier transform infrared, nuclear magnetic resonance, carbon-hydrogen-nitrogen-sulfur analysis and hydroxyl value. The colour properties were checked using UV-vis spectrophotometry and density functional theory, while thermogravimetric analysis was used for the thermal degradation studies of both the dyes. Findings Water-soluble cardanol-based azo dyes were prepared successfully having good thermal stability, and the obtained results are being presented in this paper. Originality/value The originality lies between the use of cardanol as a bio-based resource for the synthesis of azo-dye and the obtained azo-dye has the pH-sensitivity.

scholarly journals Sensory and color properties of dietary cookies with different fiber sources during 180 days of storage

2013 ◽  
Vol 67 (1) ◽  
pp. 123-134 ◽  
Author(s):  
Jovanka Popov-Raljic ◽  
Jasna Mastilovic ◽  
Jovanka Lalicic-Petronijevic ◽  
Zarko Kevresan ◽  
Mirjana Demin
Keyword(s):  
Dietary Fiber ◽  
Sensory Properties ◽  
Color Properties ◽  
Color Changes ◽  
Texture Properties ◽  
Color Differences

The aim of this study was to examine the sensory properties of dietary cookies produced with addition of different dietary fiber sources (inulin and ligofructose, oat flakes, mixture of oat flakes and wholemeal flour, wholemeal flour and mixture of wholemeal flour and carob flour), and to measure instrumentally color changes of cookies upper and lower surfaces, after storage at temperatures of 18-20?C for 180 days. Addition of inulin and oligfructose was determined to be the fiber source with the highest impact on sensory properties. Storage for 180 days expressed the highest influence on texture properties of dietary cookies regardless of applied dietary fiber source. Color differences calculated from measured color properties (psychometric light, L*, psychometric tone, a*, and psychometric chrome, b*) between products including different fiber sources were noticeable to extremely noticeable among products, with the most expressed difference registered for products containing carob flour.

Studies on metal complex forming azo dyes. VIII. Dyes with an o-Imino Azo Group

1972 ◽  
Vol 314 (5-6) ◽  
pp. 857-862 ◽  
Author(s):  
Sanaa A. Amin ◽  
Y. Z. El-Emeri ◽  
M. Kamel
Keyword(s):  
Metal Complex ◽  
Azo Dyes ◽  
Azo Group

scholarly journals STUDIES ON THE DYEING PROPERTIES OF ACID AZO DYES (PART IV)

1959 ◽  
Vol 15 (11) ◽  
pp. 911-916 ◽  
Author(s):  
Toshiro Iijima ◽  
Minoru Sekido
Keyword(s):  
Azo Dyes ◽  
Dyeing Properties

Disperse Dyes: Dyeing Properties and Fastness of Azo Dyes

1977 ◽  
Vol 47 (2) ◽  
pp. 126-128 ◽  
Author(s):  
S. V. Sunthankar ◽  
V. Thanumoorthy
Keyword(s):  
Azo Dyes ◽  
Disperse Dyes ◽  
Dyeing Properties ◽  
Substitutional Effect ◽  
Coupling Components

The dyeing properties and fastness of several disperse azo dyes, prepared from the o- and m-substituted p-nitroani-lines as diazo components and N-ethyl-N-cyanocthylanilinc and - o-anisidine as coupling components, have been studied in order to get an idea of the substitutional effect on dyeing properties.

scholarly journals STUDIES ON THE DYEING PROPERTIES OF ACID AZO DYES (PART VII)

1962 ◽  
Vol 18 (2) ◽  
pp. 153-161 ◽  
Author(s):  
Toshiro Iijima ◽  
Minoru Sekido
Keyword(s):  
Azo Dyes ◽  
Dyeing Properties

scholarly journals STUDIES ON THE DYEING PROPERTIES OF ACID AZO DYES (III)

1959 ◽  
Vol 15 (6) ◽  
pp. 476-477
Author(s):  
Minoru Sekido ◽  
Toshiro Iijima
Keyword(s):  
Azo Dyes ◽  
Dyeing Properties
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