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The slow dyeing property of the leveling agent

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The slow dyeing property of the leveling agent can suppress the instantaneous dyeing in the initial stage of dyeing, which is the primary factor in choosing the leveling agent. The test method of slow staining is generally as follows:

1. Experimental materials:

Sample: polyester fabric after degreasing and refining


C.I. Disperse Orange 30# 0.5% (O.M.F)

C.I. Disperse Red 60# 0.5% (O.M.F)

C.I. Disperse Blue 79# 0.5% (O.M.F)

Levelling agent x g/L

pH: 4.5

Bath ratio: 1:20

2. Experimental technology:

Stock solution dyeing: dyeing at 40, 30min heating up to 130, dyeing for 45min, sampling 6 times at 90, 100, 110, 120, 130, 130℃×45min, half of the cloth sample taken out is reduced and washed (Sodium hydroxide 2g/L, NaOH 2g/L, 80℃×20min), the other half is rinsed with tap water for about 30s and dehydrated and dried.

Residue dyeing: After each sampling, measure 40mL of dyeing residue and add 2g polyester cloth for dyeing. The process is the same as above.

3. Result evaluation:

The more uniform the color gain between the dyed samples at each sampling point, the lighter the relative color, indicating that the leveling agent has a better retarding effect.


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