Method for darkening treatment of black polyester fabrics

Abstract

The invention provides a method for darkening treatment of black polyester fabrics. The method comprises a first-stage darkening posttreatment procedure and a second-stage darkening posttreatment procedure, wherein the first-stage darkening posttreatment procedure comprises the following steps of: padding black polyester fabrics in treating liquid of 10 to 60g/l organic fluorine-type polymer finishing agent or acrylic ester-type polymer finishing agent, keeping the padding residue rate at 55 to 175 percent, performing infrared drying, roasting the polyester fabrics, performing baking setting treatment at the temperature of between 175 and 215 DEG C for 30 to 90 minutes; and the second-stage darkening posttreatment procedure comprises the following steps of: padding the polyester fabrics obtained by the first-stage darkening posttreatment procedure in treating liquid of 10 to 85g/l hydrophilic linear organosilicon finishing agent, keeping the padding residue rate at 45 to 150 percent, performing infrared drying, roasting the polyester fabrics, performing baking setting treatment at the temperature of between 180 and 220 DEG C for 30 to 90 minutes. By the technical scheme of the invention, the black depth value of the black polyester fabrics is increased by over 20 percent, and the test data obtained by the Datacolor instrument show the L value of the ultra-black polyester fabrics can reach 9.59.

Description

technical field [0001] The invention relates to a darkening treatment method for black polyester fabric, which belongs to the field of textile printing and dyeing processing. Background technique [0002] Due to the high regularity of the chemical structure of the macromolecules of polyester fiber (called polyester in China), the macromolecular chains are arranged neatly, the degree of orientation is also high, and the degree of crystallinity is also large, so it is difficult for dyes to enter the amorphous region of the fiber; On the one hand, due to the presence of benzene rings on PET macromolecules and the lack of dyeing sites on PET macromolecules, it is difficult to dye. Therefore, the dyeing of polyester fabrics is usually done with disperse dyes under the conditions of high temperature and high pressure dyeing, hot melt dyeing or carrier dyeing. [0003] Polyester fabrics can be dyed into various conventional dark fabrics according to the above dyeing process, but i...

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Problems solved by technology

[0003] Polyester fabrics can be dyed into various conventional dark fabrics according to the above dyeing process, but if you want to dye special black varieties that can meet the requirements of Arab countries, it is still difficult to use the current conventional dyeing process technology, although people have done more Many attempts have been made, such as adjusting the dyeing formula, increasing the dyeing temperature, prolonging the holding time, using mixed disperse dyes or increasing the amount of dyes, etc., but the improvement of the blackness of polyester fabrics is still very limited. After dyeing, the fabric is black but not black. Black fabric gives people a white visual effect. Even if the amount of dye is increased to more than 15% of the fabric weight during dyeing, there is no obvious effect. On the contrary, it brings about the decline of dyeing fastness and the increase of cost.