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Acid Dyes are very water dissolvable and possess preferable light speed over essential dyes. The fabric acid colors are are powerful for protein filaments, for example, silk, fleece, nylon and altered acrylics. They include sulphonic acid classes, which are normally exist in the form of sodium sulphonate salts. These expansion solvency in water provide the color atoms a negative ion. In an acidic concentration, the - NH2 components of the strands that are protonated to offer an affirmative charge: - NH3+. This ion communicates with the pessimistic color ion, permitting the generation of charge connections. And in addition this, bonds of Van-der-Waals, dipolar and hydrogen are framed amongst color and fiber. As a category, acid colors can be separated into two sub-categories: acid-milling or acid-leveling.
Compound Structure Of Acid Colors
These colors are generally highly complex in formation yet possess great fragrance molecules, possessing a amino group or sulphonyl that makes them dissolvable in liquid. Almost, every color belongs to the below three primary structural molecules:
1. Anthraquinon Kind
2. Azo Dye Kind
3. Triphenylmethane Kind
Various Sorts Of Acid Colors
The basic dyes are classified into several groups , based on the leveling properties, economy of the dyeing and fastness properties, however generally these are classified into these three classes,
The essential colors are arranged into a few kinds, supported on the leveling features, cost saving and quickness characteristics, however for the most part these are grouped into these three categories:
1. Neutral Acid Colors :-
These are supra processing or quick acid colors, possessing medium to great wet fastness characteristics, a portion of the colors possess poor light speed in pale shades. Numerous dyes are utilized as self shades as it were. These are utilized to the fiber in a timid netural or acid pH.
2. Weak acid dyes
These colors has a place with the processing class of colors. These colors have great fastness features yet light quickness is high to poor.
3. Strong acid colors
These colors are utilized in a powerful acidic medium and furthermore known as leveling colors, however there damp fastness features is a drawback. These colors are great to deliver the mix shades.
Arrangement As Indicated By Coloring Qualities
Acid dyes are generally arranged by their coloring approach, particularly in connection with the coloring pH, their relocation capacity amid coloring and their cleaning fastness. The atomic load and the level of sulphonation of the color particle decide these coloring qualities. Further, the initial grouping of this sort, based on their approach in fleece coloring, is as per the following:
1. Level or equalizing acid dyes
2. Quick acid colors
3. Processing acid colors
4. Super-processing acid colors
Milling is the procedure in which a fleece material is processed, in fragile alkaline concentration with significant mechanical process to advance felting. Colors of great fastness to processing are important to prevent color bleeding amid the procedure.
Qualities Of Acid Dyes
Since, acid dyes are sold as a sodium salt, hence, these frame an expansive anion in the fluid medium.
The Primary Features of Acid Colors are:
Process Of Coloring With Acid Colors:
Disintegration of colors in fluid solvent, generates a hued anion. The polyamide and protein filaments make cationic destinations in water under acidic situations, as the causticity of the concentration is expanded more cationic locales are delivered under these unequivocally acidic circumstances. These cationic locales are in this way accessible for the acid color anions to blend with through hydrogen connection, vander waals strengths or ionic connection. These associations are sufficient solid to break, and hence coloring produced are quick .
Fastness attributes of acid dyes
The damp and light fastness characteristics of the acid colors differed from poor to fabulous, relying on the atomic structure of the colors.
The fastness qualities in accordance with the category are mentioned below:
Since these colors have great leveling and relocation attributes, and possess a low resemblance for the filament, in this manner the damp fastness characteristics of this category are normally poor.
Weak Acid Dyes Or Half Milling Dyes :-
These colors have a medium to great resemblance for the fiber as well as are usually used in fragile acidic shower, depicts medium to excellent damp fastness attributes.
Powerful Acid Colors Or Super Processing Colors:
These colors have poor depletion properties, thus used under extremely solid acidic circumstance, show great fastness qualities.