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Disperse dyes have many varieties and wide chromatograms, and their sensitivities to pH are very different. Dyeing solutions with different pH values often lead to different dyeing results, which affect the depth of color, and even cause color change in serious cases. In weakly acidic medium (pH4.5～ Read More
1. Dyeing spandex with disperse dyes, the optimum process conditions are: temperature 125℃, time 30～40min, pH value 5～6.2. The dyeing temperature should be controlled within the range of 120 to 130 °C. When the temperature is less than 120 °C, the color fastness is not enough, and it is easy to deco Read More
(1) Physical properties of disperse dyes:Wetting, dispersibility, particle fineness, dispersion stability, etc. These properties will affect the preparation of the dye solution and are the main factors for the formation of dyeing spots.(2) High temperature dispersion stability of disperse dyes:Repre Read More
Polyester is generally dyed with disperse dyes. Disperse dyes do not contain strong water-soluble groups and are dyed in a dispersed state during the dyeing process. A class of ionic dyes can be divided into three types according to dyeing temperature or sublimation fastness, S type, SE type , Type Read More
1. It is easier to dye nylon with disperse dyes using alkali agents to reduce the color, but the shade changes greatly, and the darkening is serious.2. For dyeing nylon with neutral dyes, soda ash treatment has almost no color reduction ability, and the shade changes, caustic soda has the color redu Read More
In the polyester dyeing process, the heating rate, the holding temperature and the pH value of the dyeing bath have a greater impact on the dyeing quality. Theoretically, under the condition of ensuring that the fabric does not appear colored, the shorter the dyeing process, the lower the dyeing cos Read More
①The definition of lifting power:Lifting power is one of the important properties of disperse dyes. This characteristic indicates that when each dye is used for dyeing or printing, the amount of dye is gradually increased, and the degree of color depth on the fabric (or yarn) increases accordingly. Read More
The thermal migration of disperse dyes is not the redistribution of dyes in the two phases of fiber and surface solvent under dry heat conditions, but its inherent physical characteristics, which also cause the color fastness and shade variation of polyester-containing fabrics to decrease during dry Read More
Disperse dyeing is mainly used for polyester fiber dyeing at high temperature and high pressure. Although the disperse dye molecules are small, it is not guaranteed that all the dye molecules enter the fiber during dyeing. Some disperse dyes will adhere to the fiber surface, resulting in poor fastne Read More
The influence of disperse dyeing The thermal migration of disperse dyes is not the redistribution of dyes in the two phases of fiber and surface solvent under dry heat conditions, but its inherent physical characteristics, which also cause the color fastness and shade variation of polyester-contain Read More
Thermal migration is a redistribution phenomenon of disperse dyes in two-phase solvents. Therefore, all additives that can dissolve disperse dyes can produce thermal migration.The reason for the thermal migration phenomenon is that the auxiliary agent in the outer layer of the fiber dissolves the dy Read More
Causes of scattered dyeing spots and spots There are two kinds of color spots and spots produced by the high temperature and high pressure dyeing machine when dyeing polyester knitted fabrics:1. The color spots and spots caused by the condensation of dyes can be repaired with a repair agent or strip Read More
