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DYCROTHOL Dyes
DYEING OF COTTON YARN WITH NAPTHOLS
Sr. No. DYCROPRINT C.I. No. Const. No.
1 NAPHTHOL – AS 37505 AZOIC COUPLING COMPONENT 2
2 NAPHTHOL – ASBO 37560 AZOIC COUPLING COMPONENT 4
3 NAPHTHOL – ASSW 37565 AZOIC COUPLING COMPONENT 7
4 NAPHTHOL – ASD NAPHTHOL – ASD AZOIC COUPLING COMPONENT 18
5 NAPHTHOL – ASOL 37530 AZOIC COUPLING COMPONENT 20
6 NAPHTHOL – ASPH 37558 AZOIC COUPLING COMPONENT 14
7 NAPHTHOL – ASTR 37525 AZOIC COUPLING COMPONENT 8
8 NAPHTHOL – ASBS 37515 AZOIC COUPLING COMPONENT 17
9 NAPHTHOL – ASE 37510 AZOIC COUPLING COMPONENT 10
10 NAPHTHOL – ASG 37610 AZOIC COUPLING COMPONENT 5
11 NAPHTHOL – ASCL (ASCA) 37531 AZOIC COUPLING COMPONENT 34
12 NAPHTHOL – ASKB 37526 AZOIC COUPLING COMPONENT 21
13 NAPHTHOL – ASRL 37535 AZOIC COUPLING COMPONENT 11
14 SNAPHTHOL – ASITR 37550 AZOIC COUPLING COMPONENT 12
15 NAPHTHOL – ASTR 37521 AZOIC COUPLING COMPONENT 8
16 NAPHTHOL – ASLC 37555 AZOIC COUPLING COMPONENT 23
17 NAPHTHOL – ASIRG 37613 AZOIC COUPLING COMPONENT 44
AGSON offers 17 napthols which in combination with bases can give a very large number of shades. The spectrum of shades available is particularly rich in yellow, orange, red, maroon, brown, blue and black. The dyeing possess very good fastness to light, soda boil and chlorine.

These napthols can also be produced on viscose and jute and by certain modifications in the dyeing recipe on silk, wool, nylon and polyester fibers.

Napthols are first applied to cotton in solution form. They form insoluble pigments on the fibre when coupled with diazo solution of amino compounds known as "fast bases" in dyestuff trade. napthols can be applied by several methods such as tub-dip, open beck, jigger, padding, circulating liquor ect. The dyeing of cotton, with napthols involves two separate operations :-
  • Impregnation of material with napthol solution.
  • Developing the impregnated material, with diazotised fast bases or Fast Salt solutions, Dyeing is followed by soaping aftertreatment, to develop true shade, to remove excess color pigment and to get normal fastness properties.
 
PROPERTIES NAPTHOLS
  • Napthols are available in micropulverised form.
  • These dyes are water insolubles which contain simple water soluble diluents.
  • The nature of solutions of napthols during application is highly alkaline having an approx. pH of 12-14.