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The Fixing Way Of Non-Formaldehyde Dye Fixative Agent For Fabric Use

The Fixing Way Of Non-Formaldehyde Dye Fixative Agent For Fabric Use

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[Recommendation]Enke non-formaldehyde dye fixative agent BRIFIX AKS BASE

Product brief introduction

 It is compounded by quaternary ammonium compound, and have excellent fasting effect. And it can be used to in the color fastening process of activated dyeing, dyeing and printing.

Application scope
1. The color fastness process of dyeing cotton, rayon fabric and woven fabric with reactive dyes 

2.The color fastness process of dyeing cotton, rayon fabric and woven fabric with direct dyes 

Product property
1. Non-formaldehyde, environment friendly

2. The low rate of color change and yellowing in the process of dye-fixing. 

3. Do not affect the original fabric hand-feeling and hydrophilic

4. For activated and direct dye, the fastness to washing will be up to 4 grades even 4-5 grades.

5. It has the advantages of wide temperature range. In the process of drying and shaping under temperature 100-170 ℃, it has excellent color fixation effect.
The Fixing Way Of Non-Formaldehyde Dye Fixative Agent For Fabric Use

The fixing way 
1.the molecule cationic groups in fixing agent and the anion groups in dye forms electrostatic binding, and the dye and fixing agent will stick on the fiber. Which will reduce its water solubility and improve the dyed fabric soap washing and the fastness and white cloth. The stronger of the cationic fixing agent, the better of the soaping washing and fastness of white cloth . For example, the introduction of quaternary ammonium salt groups can improve the fixing effect of fixing agent. The fixing agent TCD-R,EccofixFD-3 and TCD-R agent manufactured in Shanghai auxiliary plant belongs to this group.

2.By the Cross-connect among reactive groups of dye-fixing agent molecule, reactive groups on dyeing molecule and hydroxy of fiber molecule, we can decline the water solubility of dye and improve the fabric’s soap washing fastness,  white cloth’s color staining and wet ironing fastness. Wet ironing fastness is fastness that is the transfer to the fabric from the bond breaking of activated dye and unfixed dyes during wet cloth ironing.To improve the wet ironing fastness, the method of adopting cross-linking agent is efficient. By the cross linking, the bond breaking dye will not transfer from dyed fabric to the ironing cloth anymore. Introduce reactive groups in dye-fixing agent can improve wet ironing fastness. Because of the insufficient content of reactive group, the wet ironing fastness effect is not as good as that of cross-linking agent. dye-fixing agent in the market. If the dye-fixing agent is high polymer,with the same quantity of reactive group, its property in improve the wet ironing fastness is usually worse than that of dye-fixing agent with low molecular weight

3.Using the covering property of dye-fixing agent on the fabric to improve the color fastness. We can get from the experiment that: the dye-fixing agent with good covering will have the better color fixing effect. The polymer, which is polymerized from olefin, can improve the color fastness even if there is no reactive group or cationic group, Because the polymer covering in the fabric surface will reduce the dye dropping and dissolving. With the increasing of the molecular weight , the fastness will increase. If we introduce the reactive group or cationic group in the covering material, we can improve the color fastness. The new color fastness usually uses this way.

4.By molecular attraction between fiber and dye-fixing agent to increase fixing strength of a solid fixing agent, and to improve the color fastness, Here the molecular attraction is mainly refer to hydrogen bond attraction. It can explain that the dye-fixing agent made from polyethylene polyamine and epichlorohydrin is better than that of dimethylamine and epichlorohydrin. For example, the polymer of DETA and dicyandiamide, the strong hydrogen bond attraction causes it good fastness. Adding its weak cationic property and the DETA:dicyandiamide equal to 1:1,if the epichlorohydrin quantity is increased, it can form tridimensional condensation compound, the reactive groups increase, the fastness effect should be good. But in fact, it is opposite. Because this dye-fixing agent is stereochemical structure, not plane structure, which decrease the hydrogen bond attraction and causes the decrease of dye-fixing effect.

5.Using the acid absorbing ability of dye fixing agent to improve the perspiration fastness of fabric. As we all know, the reactive dye fabric is easy to be broken in acid solution. In the acidic environment, the covalent bond between dye and fiber will be hydrolysis and break, which will cause the decrease of perspiration. Because there is acidic material in sweat.. In order to improve the perspiration fastness, the dye-fixing molecule should include strong acid absorbing ability. So there should include nitrogen-atoms in the dye-fixing agent molecule. The use of Polyhydric alcohol amine is better than polyatomic acid or naphthalenediol is the great proof.

6.Using the Smoothing agent in the dye-fixing agent to make the surface of fiber smooth and soft,  improving the crockfastness of fabric,  So far, the domestic and imported dye-fixing agent can only reach 2 ~ 3, not to level of 3 or more than 3 . The reason is   after the formaldehyde-free fixing agent covering, the smooth have no improvement. Therefore, the recent development at home and abroad are dedicated to improving wet rubbing fastness of the fixing agent, and has been sold.  These are actually special softnening agent, such as, polyethylene emulsion, amino silicone and so on. These softening agents are only only effect in a large amount of time (more than 50g/L). This kind of additives only can be used by combining with the fixing agent. The ongoing development of soft material can graft with fixing agent, so as to improve the soft and wet rubbing fastness.

7.using grafting approach and introduced the ultraviolet absorbent to fixing agent molecules to enhance the activity of the light fastness of dyes. The light fastness of reactive dyes is much was than soluble vat dyes and vat dyes. Especially in light color, the fastness is not ideal, need to improve it by fixing processing. At present, we can use ultraviolet rays to improve the light fastness half degree., but durability is not good,.Therefore, to seek more effective methods is the scientific research content. The introduction of ultraviolet absorbent to fixing agent molecules reduced anti UV effect or not remains to be tested.
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