HT Fine Chemical Co., Ltd.
The common dyeing problems and selection of textile auxiliaries

The common dyeing problems and selection of textile auxiliaries

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1. Unqualified color fastness

The color fastness include light fastness, soaping fastness, perspiration fastness, crock fastness,  ironing fastness and so on. The fastness mainly related with the structural property of the dye. It also related with the fiber, the concentration of the dye, the dyeing and finishing process, the environment and etc. So the fastness is qualified or not is related with the dye and the dye process ans auxiliary.

During the dye certificate process, we must consider the dye, fiber, and the requirement of the customer. With the help of the auxiliary, the dye will  dye the fabric fully and fix the color.

For auxiliary, first, we usually choose leveling agent and accelerating agent, and dye the fabric evenly and fully. HT FINE Chemicals has these following types of Leveling Agent:

Leveling Agent for Acid Dyes 2015K
Leveling Agent for Cationic Dyes RAN
Acid Leveling Agent HTW
Leveling Agent for Acrylic 1227
Leveling Agent for Acrylic M08
Oil Removing and High Temperature Leveling Agent LA
High Temperature Leveling Agent HT-2092

leveling agent

Second, add chelating agent to overcome the dye and metal ions in the water to form a floating color, and reduce the hydrolysis activity of dyes in water ; third,  choose excellent soap lotion, and clean floating color, and prevent the floating color adhere to the fabric; Fourth, choose proper dye-fixing agent. At present, except the unsatisfied dye-fixing agent for light fastness, the dye-fixing agent for soaping fastness, perspiration fastness, crock fastness can be found.

HT FINE fixing agents as below:

Fixing Agent for Polyester DG-1
Fixing Agent Y
Fixing Agent for Sulfur Dyes LG26
Fixing Agent for Acid Dyes GTR
Formaldehyde-free Fixing Agent WPB
Fixing Agent for Acid Dyes SP
Chlorine-resistant Fixing Agent GT25
Fixing Agent WB without Shades Change
Fixing Agent for Printing with Acid Dyes HT-505
Hydrophilic Formaldehyde-free Fixing Agent QG-200

Fixing Agent for Polyester DG-1

2. The brittle damage

Brittle performance appears to be strong decline. in addition to the brittle damage or even holes caused by improper handling of oxygen bleaching in the pretreatment stage, there are two reasons that may result in the brittle damage during the dyeing, First, the brittle damage caused by dye like sulfur black, strong reductant, and oxidizing agent can be repaired by tendering resistant agent . Second, the improper acid in the phase of dyeing process or neutralization process.

The glacial acetic acid is usually be used in the neutralization process. But there are some substitute, like BASF’s organic acid buffer, no strong inorganic acid such as sulfuric acid, hydrochloric acid, phosphoric acid is included, better performance.

The organic acid buffer produced by HT Fine Chemical Co., ltd. have similar performance. The substitute, organic acid buffer can improve the shortage that occurs in glacial acetic acid, for example, the glacial acetic acid have the disadvantages of pungent taste and  residual acid. It also combine with metal ion like Ca+2 and Mg+2, and remain on the surface of the fabric and causes colorless. It also not be used in the winter.

But some substitute including H2SO4、HCl、H3PO4,  not only change the color of the fabric but also corrode the equipment, and remain acid will also cause the brittle of the fabric in the acid circumstance.

3. Crease Streak
The reason that causes the crease streak include equipment, the quantity of the fabric, bath ratio and process and etc. The quantity of the fabric, the friction and pressure among fabric, the  pumping capacity and the tension capacity have impact on the flatness of the fabric. The bath ratio also have effect on the fatness. Moreover, the too slide caused by too much hubble-bubble of the Auxiliary, the sudden cold or sudden changes in heat also make crease streak possible. At present. Anti wrinkle agent, bath treasure, softening bath lubrication can be used to improve the crease streak. But only this can not prevent from the crease streak if other method ,like improving the equipment and improve the process, not to be adopt.

The textile auxiliary have few influence on the weathering, but the property of the dye ( acid and alkali resistance), the fabric’s acid-base property and the humiliation and pH value of the air have great influence on the result.

For example, the weathering may occurs when the dye emerald blue GC and chrysophene G is among the acid air. emerald blue KN-G and brilliant orange X-GN are sensitive to the acid and alkali. and the weathering is also easy to occur. Disperse  dye yellow RGFL is sensitive to alkali, and the the weathering is also easy to occur.  For auxiliary, naturalization is necessary. And the Ph value should be close to 7. So the selection of the acid and alkali is important. glacial acetic acid and the substitute, organic acid buffer, is the best choose. Strong inorganic acid like H2SO4, HCl is prohibited to be used. And the choose of alkali is better to be among weak alkali.

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