1. Several issues related to acid dyes
1. Classification of acid dyes:
Strong acid bath acid dye H2SO4 PH2—4
Three major categories: weak acid bath acid dye HAC PH4—6
Neutral bath acid dye NH4AC PH6—7
2. Applicability of acid dyes:
Dye wool, silk and nylon in acidic or neutral solvents.
3. Characteristics of nylon dyed with acid dyes (weakly acidic bath):
1) Fast coloring and poor leveling—requires the use of appropriate leveling agents;
2) Poor dyeing fastness (such as soaping fastness) – color fixation is required (especially medium and dark varieties)
3) Dyeing process: Dyeing at 50-600C – Guaranteed at 1000C – Water fixation treatment in sequence.
2. Dyeing process of nylon with acid dyes
1. Dye liquor composition:
Dye X%;
① Acetic acid 1-3%;
Leveling agent 0.3-0.5%
PH4—6 1=20
② Fixing agent 2-4 %
HAC 0.5-2%
2. Dyeing methods: one-bath method, two-bath method (specific operating curves are as follows)
1): one-bath method operating curve
PH4-6 liquor ratio 1:20
2): Two-bath method operating curve
①Dyeing
③Fixing solution prescription :
Fixing agent 2-4%
Glacial acid 0.5-2%
PH4—5
1. The functions of this kind of auxiliaries:
1): Leveling agent: (such as leveling agent)
To achieve uniform dyeing As a result, using too much will cause the color bar to drop.
2): Glacial acetic acid
Adjust the PH value and add it during dyeing. The purpose is conducive to leveling dyeing;
3) Fixing agent:
Improve Dye fastness of acid dyes.
4) Chemical materials:
Beat with cold water, dissolve in hot or boiling water, Stir thoroughly to dissolve, dilute and filter before use.
5) Adding materials:
Be careful to add materials slowly and evenly to avoid adding materials too fast. Color flowers.
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