HT Fine Chemical Co., Ltd.
textile-auxiliaries-chemicals-manufacturer
Cautions in the Use of Acidic Dye Fixing Agent

Cautions in the Use of Acidic Dye Fixing Agent

Time:   Click: 74

The Action Mechanism of Acidic Dye Fixing Agent

Acidic dye fixing agents are generally aromatic sulfonic acid condensates with high molecular weight, which can improve the water fastness, seawater fastness, washing fastness and perspiration fastness after fixing. High molecular weight aromatic sulfonic acid condensates are coated on the surface of the fibers. The negative charge of sulfonic groups on the surface of the fibers repels the acid dyes in the fibers, which prevents the dyes from coming out. The coating effect also reduces the swelling of the fibers, the chance of dyes binding with water molecules, and thus it improves the fastness.

Several problems should be paid attention in fixing acid dyes.

First, the fixing temperature is generally between 70 and 80 degrees. High molecular weight aromatic sulfonic acid condensates enter the fibers and lose their coating effect. As a result, the negative charge of sulfonic group decreases the repulsion of acid dyes in the fibers, resulting in a decrease in fastness.

Second, fixing time should not be too long. If the time is too long, high molecular weight aromatic sulfonic acid condensates will diffuse into the fiber, reducing the coating effect, resulting in a decline in fastness. Acidic dye fixing agents are generally high molecular weight aromatic sulfonic acid or carboxylic acid condensates, which are easy to precipitate under strong acid conditions, that is, precipitation occurs, it is easy to produce fixed spots when fixing.

Third, acetic acid should not be mixed with fixing agent to avoid precipitation.

Fourth, when fixing, it is better to use soft water to avoid precipitation of calcium and magnesium ions and dye fixing agents.

Fifth, before fixing, the cloth surface should be washed to avoid fixing spots.

Related News
  • Growing Trends of Knitted Fabric Dyeing and Finishing Process

    Growing Trends of Knitted Fabric Dyeing and Finishing Process

    September 11, 2017China has been joining WT0 for six years, and the textile quota has been cancelled, the main obstacle of the current export of textile clothing is technical barriers such as green and environmental pr...view
  • Pretreatment of textile fabric

    Pretreatment of textile fabric

    July 28, 2017Pretreatment of textile fabricPretreatment of textile fabric mainly refers to the removal of impurity for fiber and textile. It is aimed to improve whiteness and performances such as softness of the t...view
  • The Influence Of Dye-Fixing Agent On Cotton Reactive Dyeing Glossiness

    The Influence Of Dye-Fixing Agent On Cotton Reactive Dyeing Glossiness

    May 4, 20171. Experimental methods:1.1 Fabrics Take 100% refined and bleached cotton single jersey sample from production line , and water wash in the lab, adjust the PH to 6.5. 1.2 Dye Choose dye Sumifix HF,RemazolRR,Rema...view
  • Talking about the Textile Enzymes: Desizing Enzymes

    Talking about the Textile Enzymes: Desizing Enzymes

    June 6, 2017The main content of the desizing enzymes currently used in the textile industry is the alpha amylase. It is used for the removal of starch size to make preparation for the next dyeing processing. Comp...view
  • Silicon Spot Solution

    Silicon Spot Solution

    May 23, 2017The soft textile agent is the kind of soft agent with good performance and prominent effect, which is widely used. But it also has obvious defects, that is, after treated by the organic silicone, if t...view
Pretreatment Auxiliaries
Dyeing Auxiliaries
Hand Feels Finishing Agent
Contact