The influencing factors of textile wet rubbing fastness and improving measures Music in Japan

The influencing factors of textile wet rubbing fastness:


1, dye performance


some good water soluble dyes, such as reactive dye, containing water soluble groups, is advantageous to the dye dissolved in the process of dyeing and dyeing. However, in the process of wet rubbing test, due to the presence of water, can make the reactive dye molecules generated from fiber and tend to dissolve in water, thus reducing reactive dye and fiber bonding.

and some poorly water-soluble dyes, such as VAT dye, in the process of continuous pad dyeing with suspension state commonly mechanically pad dyeing to the fiber, the reduction of steam, become on of water-soluble dye leuco dye in the fiber, and then after oxidation, soap boiling, fixation on fiber, at this point, returned to the water-insoluble state VAT dye molecule. So VAT dye dyeing of fabrics because of its dyeing dye water-insoluble quality and make it resistant to wet rubbing fastness is better than that of dyed fabric dyeing with reactive dyes.


2, the color depth ( The dye concentration)


in the fabric, pretreatment and dyeing process under the same conditions, the deeper the color, the higher the concentration of dye, dye molecules between friction test fabric with white cloth concentration gradient, the greater the dye transfer to the greater the likelihood of white cloth, via the friction resistant to wet rubbing fastness is the worse.


3, the influence of floating color,


floating color including hydrolyzed dye and hydrolysis has been dye react with fiber. These dyes by hydrogen bonding, van der Waals force and fiber attract together, between the fiber and the affinity is very low, is smaller when the external force can easily be pulled away from fabric. So floating color is resistant to wet rubbing fastness of the fabric of an important factor.


4, the influence of water quality,


if you use a hard water to material, especially the fixation fluid, due to containing CO32 - 哦, Such as anionic, they react with Ca2 +, magnesium 2 + generated Ca2CO3, MgCO3 etc. Insoluble substance. The insoluble material and dye together, form a lake and deposit to the fabric surface, increase the friction force when friction greatly, resulting in lower resistance to wet rubbing fastness. In addition, Ca2 +, magnesium 2 + can react with some anions on the dye molecules, into a substance does not dissolve in water, so as to weaken the hydrophilicity of dye, the dye is not easy to dissolve and diffusion, water floating color is not easy to wash off.


5, fabric structure and surface finish


the fabric structure affect the softness of the fabric surface, and smooth degree determines the size when the friction test the friction, friction fastness.


fabric resistant to wet rubbing fastness of another important factor is the fabric surface finish. Fiber end exposed on the surface of the yarn, thus in the fabric surface to form a layer of fuzz. This layer of fuzz in dyeing and finishing process, are under constant friction, flushing, and fabric has very poor adhesion of, again by external force, some short chopped from fabric and staining to the white cloth. In the process of production, grinding fleece worse than mercerized cloth rubbing fastness to 0. Level 5 to 1.





what measures improve the wet rubbing fastness can be?


1, the choice of cloth


with the same specifications of dyeing cloth, the different methods of the pros and cons of the yarn quality and weaving, the influence of such factors can cause the same technological conditions and processing of resistant to wet rubbing fastness of the dyed fabric. So should choose uniform yarn quality, yarn count, cloth clean cloth is preferred.


2, pre-treatment process


fabric surface is smooth, the higher the wet rubbing fastness, singeing to net, therefore, should reduce colored fiber particles at the same time; Scouring and bleaching process pressure, temperature, etc, should be evenly, make the fabric has a uniform Mao Xiao and whiteness, to dye diffusion and penetration.


3, dye selection and dyeing process


choose the lifting force is higher, then float less color dye. Need color matching, select the same category as far as possible, the same manufacturer of dyes, at the same time the compatibility value of dye should be similar. In the process of dye solution configuration, should try to use soft water, when appropriate, can add softener, at the same time can increase some penetrating agent in order to improve the dye penetration performance. In the dyeing process, should be controlled on pH in 4. 0 - 7. Between 5, in order to prevent the strong alkaline bonding force between the dye and fiber, lower the fabric wet rubbing fastness.


soaping process should be as much as possible for floating color, can increase the number of washing, increase water flow. At this time should use neutral detergent, in order to prevent the alkaline detergent dye hydrolysis again.


4, post-processing


in order to improve the crocking after dyeing, after the dyed solid color post-processing. Subsequent processing has two kinds: one kind is cationic fixing agent, using the larger molecular weight combined with quaternary ammonium salt cationic and anionic dye, closed its water soluble groups, thereby reducing dye solubility in water, improve the wet rubbing fastness, but it tends to cause resistance to sunlight fastness to reduce; Another kind of wet rubbing fastness improver, mostly polyethylene emulsion and the special amino silicone softener, these substances on the fabric surface stitch membrane, thereby reducing the friction on the surface of the fabric, to improve the effect of wet rubbing fastness.


how to improve the wet rubbing fastness of the dye is a comprehensive problem, must from the choice of fabric, pretreatment, dyes selection and dyeing process various aspects, such as control.