Add：Yuelai Town, Haimen, Nantong, Jiangsu
Clothing coating dyeing methods and precautions
For dyeing garment coatings, I believe many people do not quite understand it. It is because of poor understanding that the dyeing of garment coatings cannot be properly used. In this regard, the following explains the method and precautions for dyeing garments.
First, the paint is insoluble in water, and it is a pigment that does not have an affinity for the fiber and cannot be dyed according to the dyeing conditions of the dye. For textiles, coatings have been developed that use anionic surfactants to disperse evenly in water.
The paint was dispersed into microparticles of 1 micron size, and about 108 moles contained in one microparticle were all attached to the fibers. The dyes are dyed in units of 1 mol (a few moles of associating state depending on the situation). Here we can understand the differences between paints and dyes.
Second, the paint does not have the ability to diffuse into the interior of the fiber. For this purpose, the coating is physically attached to the surface of the fiber and is fixed to the surface of the fiber using a resin component called an adhesive. If the binder is used to completely fix it on the surface of the fiber, the pigment will not easily come off and the color fastness will be good. However, due to the influence of the resin contained in the adhesive, there is a shortcoming that the touch becomes hard.
Third, paint padding is mandatory coating physically attached to the fiber surface. Because it is fixed with an adhesive, dyeing can be performed even if the coating itself does not have affinity for the fiber. In the dyeing of garment coats and the like using the exhaust method, it is necessary to try to secure the paint to the fiber surface.
* When dyeing by the exhaustion method, a cationic polymer (for example, a compound used as a dye fixing agent and the like) is attached to the fiber surface in the pretreatment step. Typically, the coating is dispersed by an anionic interfacial activator, and the cationic group of the pretreatment agent is combined with the anionic group of ions of the anionic activator on the coating surface, and the coating is absorbed by the fiber surface.
Because this is not a combination of paint and fiber, it is not strong. After adsorption of the paint, the resin is adsorbed on the fiber, and the paint on the surface of the fiber is bonded to the fiber by the resin. The staining process is as follows:
[Example of coating dyeing process] Rehearsal→Hot water wash→Cationic pretreatment (60～70°C×20～30min)→Dyeing of paint (70～100°C×30min)→Extraction of adhesive (30～60°C) → Drying • Roasting (fixation of adhesive, 90-130°C × 10 min).
The main pigment used in the above dyeing method is a coating of the following chemical structure, and the fastness of the pigment itself is extremely good as compared with ordinary dyes:
Yellow: Acetoacetic Aniline Yellow Coating
Blue to Green: Phthalocyanine Coatings
Black: carbon black paint
White: Titanium coating
In the exhaustion method, it is not appropriate to use a large amount of adhesive for treatment. For example, when clothing coatings are dyed, due to their great importance on hand and epidemic, it is necessary to reduce the amount of adhesive used. For this reason, the following problems often occur in color fastness:
1. Fastness to sunlight (discoloration), discoloration (caused by the incomplete combination of coating, condensation, migration, etc.);
2. Rubbing fastness (wet), abrasion pollution (caused by incomplete dyeing of the coating surface);
3.washing resistance, color off (caused by the solvent resistance of the adhesive).
For the fabrics dyed with paint by the exhaustion method, the phenomenon that the color fastness is not up to standard is relatively common, so it is necessary to carry out research and development on the original basis after fully grasping these conditions.