8 solutions to improve wet rubbing fastness
You, the choice of dyes
There are lots of varieties of reactive dyes, as well as the quality varies greatly. It is very important to select dyes in which meet the dyeing level of quality standards.
1. Choose dyes using double active groups in addition to multiple active groups
S-triazine reactive dyes react with fibers to make ester bonds, which include poor acid resistance in addition to stability. Vinylsulfone dyes start up with fibers to connect with ether bonds, producing poor alkali resistance, along with dyes with double reactive sets have improved acid and also alkali resistance.
2. Pick out direct and suitable dyes
If the directness of reactive dyes (such because vinylsulfone-based reactive dyes) is too high, the diffusion performance is poor. The dyes often accumulate on the surface from the fabric and are complicated to diffuse and transfer in to the fiber. It is easy that will cause more floating colors and difficult to clean, but the directness is not really Too low affects the fixation rate, so the directness of reactive dyes is more preferable, and the directness can be obtained from the data provided by dye supplier.
3. Select dyes with high fixation price
The dyes with huge fixation rate have a smaller amount floating color, and the actual fixation rate is 80%. The quantity of floating color after dyeing is definitely relatively small, which is helpful to remove the suspended color; the fixation price is 70%, (final dyeing rate-fixation rate) The particular floating color of 15% reactive dyes is difficult to cut out, so it is not worthy of dyeing medium and black colors.
4. Choose dyes having high lifting power
Inside the dyeing process design, how much dye should generally not exceed 10% from the dyeing saturation value. Excessive dye can't be completely dyed, and the fixation is insufficient. The unfixed dye is along with the surface of the particular dyed article, which affects the wet rubbing fastness of the dyed article. For bluish colors, dyes with excessive exhaustion rate, high fixation rate along with high lifting power need to be selected, such as reactive dyes with double and multiple reactive organizations.
2. Choose a gray cloth with uniform yarn be counted and smooth surface. When pretreatment is required, high-efficiency pretreatment agent should be used.
3. Soft water or deionized h2o should be used if you can , for dyeing water, which often can reduce the influence associated with calcium and magnesium plasma while in the water on dyeing.
Last, the selection of solving agent
The high-efficiency fixing agent should be able to "bridging" between the dye as well as the fiber to form a compound, and when it reacts considering the dye, it can react and cross-link while using cellulose fiber, so how the dye fiber can end up being closely and firmly related together and prevent the dye on the fiber falls off avoiding the decrease of colour fastness. The fixation effect could be that the fixation agent interacts considering the fiber in the transmitter along with the cationic group then forms a salt when using the dye anion to have fun with the role of fixation.
An outstanding formaldehyde-free fixing agent can enhance the wet rubbing fastness regarding reactive dye-dyed fabrics by 0. 5 to YOU level. The properties belonging to the fixing agent are: a polymer compound that will form a film, polyurethane or even silicone with -OH, -NH2, and a cross-linking realtor to cross-link the polymer to make it durable and rapid film formation No change color, yellowing, and will not reduce the fastness to light. It can make the dyed material look smooth, reduce the area friction coefficient, and maintain the breathability and moisture permeability of the dyed material.
5. Special auxiliaries can reduce the quality of dyes used in finishing for getting a deep color outcome, and the wet rubbing fastness is usually improved.
6. The pH value with the fabric after dyeing.
The number of alkali used in the dyeing of dark along with dense cotton fabrics is definitely relatively high. After dyeing, your washing, soaping and neutralization and de-alkalization should be strengthened. The fabric can't be carried with alkali, otherwise it will cause the dye that they are hydrolyzed after dyeing and also the wet rubbing fastness will decrease. Usually the pH value belonging to the cloth surface is manipulated at 6. 5-7. FIVE, not more than 9 or a lot less than 3.
Seven, improve the characteristics with the fabric surface after dyeing. Fabric finishing is usually treated with biological enzyme polishing, and many others.,the surface finish with the fabric is increased, and the wet rubbing fastness can be improved.
8. The floating color following dyeing with reactive dyes is difficult to clear out. After soaping, an appropriate color stripping agent is known to remove the floating color and enhance the wet rubbing fastness.
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