Gao et al. [12] designed an azo dye with a hydrolyzable cyano group, which can achieve an alkali resistance of 5 g/L NaOH despite the presence of the hydrolyzable group in its structure. However, the mechanism of alkali resistance of disperse dyes containing easily hydrolysable groups is still unclear [ 13, 14 ].
2.1. Chemistry. The synthesis of some dyes based on dimethylamino-p-arylpropenones derivatives has reported by us [].Herein, in an attempt to estimate their dyeing characteristics, enaminones 1a,b react with phenyl diazonium salts 2 in acidic medium to afford disperse dyes 3a,b ().. Disperse dyes 3a,b were applied to polyester …
Disperse dye molecule was introduced to polyether monoamines and used as dispersants. The solution characterization and adsorption isotherm of copolymers were studied. The introduction of dye molecule doubled the saturation adsorbed amount. The introduction increased the adlayer thickness by about 2 nm. Stabilization mechanism …
Disperse dyes have particularly low water solubility and to be used from this medium, they must be milled to a very low particle size and dispersed in water using a surfactant (dispersing agent), or else a carrier must be added during dyeing or printing [1,2,3,4]. The real mechanism by which carriers accelerate textile coloration is well known.
A comprehensive study that combined both experimental and computational experiments was performed to evaluate the usage of organo-metal oxide nanocomposite for the elimination of disperse red 60 ...
Abstract. Color Intex (C.I.) Disperse Red 60 is a bright red anthraquinone dye, but it is easy to produce dyeing defects (a kind of discoloration phenomenon, the partial color is random blue ...
Disperse dyes composed of nonionic monoazo functional group and anthraquinone subunit as chromophore are widely regarded as excellent dyeing agents …
Corresponding Author. Stephen M. Burkinshaw. [email protected]; University of Leeds, Leeds, UK. Correspondence. Stephen M. Burkinshaw and K. Liu
The real mechanism by which carriers accelerate textile coloration is well known. Polyester fabrics absorb carriers and swell. This swelling can slow ... Disperse dyes 3a,b were applied to polyester fabrics at 2% shade, without or with using commercial HC carrier at different dyeing temperatures of 70, 90 and 100 °C. ...
Disperse dyes based on the pyridone moiety can be formed from β-diketones and different diazonium salts, followed by condensation with cyanoacetamide as a first reaction route.Mijin et al. [9,10] reported the synthesis of 5-(substituted phenylazo)-6-hydroxy-4-methyl-3-cyano-2-pyridones, i.e., the known azo pyridone disperse dyes …
Dyes containing cyano group have the advantages of bright colours and high molar absorption. However, most cyano-containing disperse dyes are not used for alkaline dyeing as they are easily hydrolysed under alkali conditions. Herein, cyano-containing disperse dyes for alkaline dyeing were designed by introducing non-hydrolysable …
The temperature dependent uptake of a commercial disperse dye on cotton and polyamide 66 fabrics at dyeing temperatures between 30°C and 130°C adhered to the Williams–Landel–Ferry equation, insofar as, very good correspondence was observed between plots of experimentally determined colour strength data points (log1/f k) and the …
Nano disperse dyes are a new type of dyes with a nanometer particle size (less than 200 nm) and high stability, which are obtained by using dyes as raw materials to mix with appropriate dispersants and dispersive medium such as water and glycerin, and then undergoing chemical or physical modifications [4], [5], [6]. Generally, the used dyes …
Fig. 5. Some typical azo disperse dye structures. 2.1.2 Anthraquinone disperse dyes Anthraquinone disperse dyes were among the early acetate dyes and have made an important contribution to the violet and blue shade range. They prod uce bright dyeings of excellent light fastness and cause no dye stability problems during dyeing.
1. Introduction. Disperse dyes are the dyes commonly used for dyeing synthetic fibers currently, especially the polyester fabrics. As we all know, single molecules and aggregates of disperse dyes are two dynamic states in dyeing process [1].So, dye …
The dyeing of hydrophobic fabric with disperse dyes may be considered as a process of dye transfer from a liquire solvent ( water ) to a solid organic solvent (fibre). Disperse dyes are added to water with a surface active agent to form an aqueous dispersion. The insolubility of disperse dyes enablethem to leave the dye liquor as they are more ...
Qin et al. 58 studied the interaction mechanism between lignin derivative dispersants and dyes using QCM with dissipation monitoring and atomic force microscopy (AFM). With the increase of the ...
Color Intex (C.I.) Disperse Red 60 is a bright red anthraquinone dye, but it is easy to produce dyeing defects (a kind of discoloration phenomenon, the partial color is random blue patches) in the ...
However, disperse black dye exhibited a lower color removal efficiency than the rest. All the disperse dyes have same main structure with azo chromophores and …
2.4. Preparation of nano disperse dye. 100 ml of 10.0 g·L −1 dye-acetone solution was prepared firstly by dissolving dried disperse dye into acetone. Then the …
10.1. Introduction. Disperse dyes today constitute the second largest sector in the dyeing industry: in 2006, 125 thousand tons of disperse dyes were produced, with a value of US$900 million.. The growth of disperse dyes is closely related to the growth of polyethylene terephthalate (PET) and to the development of two new fibres which can be …
(a) is disperse dyes and dispersantMF, R– is hydrophobic group, SO 3 is hydrophilic group. (b) and (c) are formation of the electric double layer. Fig. 2 Dispersion …
Part 1 : Disperse Dye for Polyester | Why called disperse dye | Application and mechanism Part 3 : Auxilaries Of Disperse Dye Why called disperse dye. Disperse dye are the smallest dye of all dyes. They are insoluble in water. When they are applied to the dye bath, they form dispersion.They are free from ionized group.So …
The agglomeration of some dyes and the antigrowth phenomenon of particle diameters were triggered by the abovementioned reasons of curve tailing, double …
mechanism by which disperse dyes are adsorbed onto PET (and all other types of fibre) are popularly articu-lated in terms of Clavel and Stanisz' aqueous solution the-ory and …
The exhaustion percentage (%E) of the disperse dyes 3–7 by PE-F in H 2 O was optically calculated by measuring the concentration of dye bath before (C 1) and after (C 2) dyeing ...
Agglomeration during the drying process is the other key issue that needs to be resolved, which improving the quality of zirconia powder becomes crucial in reducing industrial expenses. ... In addition, both the aggregation phenomena for different reactive dyes [3], and the dispersion mechanism of dispersants for disperse dyes in the water ...
Most disperse dyes belong to the category of azo dyes, which can generate a wide range of molecular com- binations by varying the diazo and coupling components and provide a …
Disperse Red 9 is a red dye derived from anthraquinone. Disperse Red 11, also called C.I. 62015 and 1,4-diamino-2-methoxy anthraquinone, is another anthraquinone dye. Disperse Red 60 is also an anthraquinone dye. Disperse Yellow 26 is a yellow disperse dye. Disperse Yellow 42 is prepared by the reaction of two equivalents of aniline with 4 ...
At 120°C temperature the dye exhaustion of Synolon Yellow EXW fluorescent disperse dye was found 30% and this increased to 60% when the temperature raised to 130°C. After 40 minutes of run time ...
Dyeing Mechanism of Disperse Dye The dyeing of hydrophobic fibres like polyester fibres with disperse dyes may be considered as a process of dye transfer from liquid solvent (water) to a solid organic solvent (fibre). Disperse dyes are added to water with a surface active agent to form an aqueous dispersion. The insolubility of disperse …
Abstract. Color Intex (C.I.) Disperse Red 60 is a bright red anthraquinone dye, but it is easy to produce dyeing defects (a kind of discoloration phenomenon, the partial color is random blue patches) in the polyester dyeing process, and the mechanism of blue patches is unknown, resulting in a low right-one-time of dyeing.
A dispersing agent is a non-ionic surfactant such as an alkyl-polyethyleneglycol. These are used to impart the leveling effect as well as to keep the dye in dispersed form, to avoid the dye aggregation and precipitation. It helps to increase dye solubility. Generally naphthalene sulphonic acid– formaldehyde condensate, lignin …
Most disperse dyes belong to the category of azo dyes, which can generate a wide range of molecular com- binations by varying the diazo and coupling components and provide a high color gamut 21–23 .
Here, we prepared a nano disperse dye with average particles size of 94 nm by self-assembly using a hydroxypropyl sulfonated alkali lignin dispersant (HSAL) and azo disperse dye (C.I. disperse Blue 79). The nano disperse dye exhibited excellent dispersion and stability at high temperature (130 °C), the particle size of that was 1.97 μm.
1. Introduction. Disperse dyes are generally non-ionic synthetics with saving dissolvability in water that can hold similarly and better substantively for hydrophobic fibers, for example, nylon and polyester [1,2,3,4,5,6].To acquire adequate dyeability, the dyeing of polyester fabrics must be performed at high temperature and high pressure or by utilizing …
Disperse dyes composed of nonionic monoazo functional group and anthraquinone subunit as chromophore are widely regarded as excellent dyeing agents and are commonly synthesized from a diazonium salt and coupling intermediate [23]. Significantly, numerous azo disperse dye possesses an hydrazyl (–N=N–) group that …
The pH of the dye bath should be between 4.5 and 5.5 for disperse dyeing. Typically, acetic acid is used to maintain this pH. Any mineral acid, such as H3PO4, may be used as well. But those are expensive and sturdy. To control the pH of the bath, a mild acid-like acetic acid is used.
However, disperse black dye exhibited a lower color removal efficiency than the rest. All the disperse dyes have same main structure with azo chromophores and auxochromes (–OH and –Cl). The –OH auxochromes in all the four disperse dyes form Mg(OH) 2, which acts through an adsorptive coagulation mechanism. Disperse red, …