Reduction Soaping Agent for Dyed Polyester/Spandex

Reduction Soaping Agent for

Dyed Polyester/Spandex

HOLPOSON® Reduce Clean

HOLPOSON®Reduce Clean is a soaping agent for reducing cleaning developed to remove the disperse dye stained on the spandex elastic yarn. When dyeing polyester/spandex fabrics with disperse dyes, the spandex stretch yarn will absorb more dyes and cause serious staining. Disperse dye stains on spandex are generally difficult to remove, and they will still remain in the fiber after reduction and cleaning, resulting in problems such as decreased color fastness.

Physical & chemical properties:             

Appearance: Yellow brown liquid

Ionicity:    Cationic

pH:        Neutral to weak alkaline

Solubility:  Soluble in water, transparent

Usage:

The usage method is subject to the type of textiles to be washed, dyeing concentration and the soaping equipment.

Generally, perform in accordance with the working condition below

prescription                       Dark color                 Light color

Reduce Clean                     3～5                      1～3g/L

Sodium hydrosulfite                 3～6                      2～4g/L

Caustic soda (50%) or soda ash       2～5                      1～3g/L

Process:After 75～80℃×15～20 mins’ reduction clearing, then hot wash,wash. If the stain is serious, repeat the reduction cleaning for 2-3 times.

Characteristics:

1. Able to remove disperse dye color stains on Spandex, significantly improving color fastness to dry/wet cleaning and friction.

2. Can also be used as a soaping agent for dyed polyester textiles, effectively removing the undyed dyes.

3. When used in reduction clearing, it can create dyed textiles with bright colors and good color fastness.

Attentions:

Reduce Clean is a special cationic soaping agent and is easier to adhere to fibers than non-ionic and anionic soaping agents. If it’s not sufficiently hot water washed and rinsed after reduction clearing, a little of it will remain on fibers. Regarding some dyes and fibers, when there’s residual Reduce Clean in fibers, during heat setting there will be issues of yellowing and reduction of color fastness due to dye bleeding. Therefore, after reduction clearing, textiles must be sufficiently hot water washed and rinsed. An effective way to remove the residual Reduce Clean in fibers is to soap with anionic surfactant (anionic rewash). If all the dropped dye in the reduction clearing liquid is in the reduced state, little will adhere to fibers again. But if the reducing agent is not sufficient, resulting in deteriorated reductibility till clearing, the reduced and dropped dye, once re-oxidized, will easily adhere to fibers again. Therefore, in the process of reduction clearing, if the reductibility can’t be maintained until the end, there will be no good clearing result.

The reductibility of reduction soaping agent varies according to the dyeing equipment used. For example, with the same recipe, compared with open-type machines like rope dyeing machine, closed-type machines like liquid flow dyeing machine will have a longer reduction duration during reduction clearing.

When confirming the recipe for reduction clearing, ensure that the dropped dye in the reduction clearing liquid must show a reduced-state color even after clearing, therefore beware that there should be no reductant shortage when confirming its dosage.

To be cautious, please pay close attention to the notes below when using Reduce Clean:

(1) For each dye to be used, please conduct preliminary reduction clearing experiment to confirm if there is strong odor. Disperse dye that doesn’t generate odor can be reduction cleared. For unconfirmed dyes, please don’t use reduction clearing.

(2) For dyed textiles with unknown dyes please don’t reduction clear.