[Polyester Dyeing Technology] Polyester Low Temperature Dyeing Carrier Formulation Technology: Men's Fitness Sportswear,Accept Custom, Tracksuit Guangzhou LIDONG Garment Industrial Co., Ltd. , https://www.lidonggarment.com
When the dyeing is dyed at high temperature and high pressure, the dyeing process of the disperse dye on the polyester fiber can be divided into the following stages:
(1) The disperse dye gradually moves closer to the fiber interface with the flow of the dye solution in the dyeing solution. At this stage, the properties and state of the disperse dye are basically irrelevant. The dissolved dye molecules and the suspended dye particles all flow with the dye solution, and the transfer speed Determined by the solution solution flow rate.
(2) Due to the existence of a non-flowing kinetic boundary layer on the surface of the fiber, when the disperse dye enters the kinetic boundary layer and approaches the fiber interface, it mainly approaches the fiber by its own diffusion. The transfer rate at this stage is not only related to the solution flow rate, but also related to the diffusion speed of the disperse dye. Therefore, the dissolved dye molecules diffuse much faster than the suspension and aggregate, and the solubility and dispersion state of the disperse dyes are transferred to this stage. Have a big impact.
(3) After the disperse dye is close to the fiber interface to the molecular force between them, the disperse dye is quickly adsorbed by the fiber surface. The rate of transfer at this stage is primarily determined by the structure and properties of the fiber and dye molecules, as well as the nature of the interface solution. Among them, the solubility and dispersion state of the dye have a great influence. The dye solubility is super high and the dye molecule and fiber act more, and the adsorption speed is faster.
(4) After the disperse dye is adsorbed onto the surface of the fiber, a concentration difference or internal and external dye chemical difference is generated in the fiber, and the dye will diffuse into the fiber. The diffusion rate here is mainly determined by the fiber chemistry and microstructure, and also with the dye molecule. Structure and concentration are related. The fiber has a high amorphous content, large pores or free volume content, high dye solubility and fast diffusion rate. Therefore, the dye diffusion rate at this stage is directly related to the degree of swelling or plasticization of the fiber and the concentration of the disperse dye in the fiber. . The degree of swelling or plasticization is high, and the concentration of disperse dye on the outer layer of the fiber is high, and the diffusion is fast.
Polyester fiber is a hydrophobic synthetic fiber. The molecular structure of polyester lacks reactive groups such as cellulose or protein fiber that can bind to dyes. Polyester molecules are arranged relatively tightly, and only small voids exist in the fiber. At lower temperatures, the thermal motion of the molecule changes its position to a lesser extent. Under humid conditions, the polyester fiber does not expand as much as the cotton fiber by violent swelling, and the dye molecules are difficult to penetrate into the fiber. Therefore, increasing the degree of plasticization of the fiber will contribute to the progress of dyeing. In addition, the solubility of the disperse dye water is very low, and the dye in the dye solution is dispersed in the dye bath by a large amount of dispersant in a suspension. In the dyeing of polyester fiber, in order to achieve a better dyeing effect, it is usually necessary to add a certain amount of dyeing auxiliary. The role of these dyeing auxiliaries in the dyeing process is multifaceted, mainly including: (1) appropriately increasing the solubility of the disperse dye; (2) promoting the adsorption of the disperse dye on the fiber surface; (3) plasticizing or improving the fiber. The degree of swelling accelerates the diffusion rate of the disperse dye in the fiber; (4) improves the dispersion stability of the dye.
Generally, the additives used in the high-pressure dyeing of polyester fibers include a carrier for plasticizing fibers, a surfactant for solubilizing disperse dyes or for stabilizing dye suspensions, and the like. Dyeing aid polyester fiber dyeing plays an important role.
Counter-dyeed polyester fibers and filament fabrics are highly hydrophobic. The usual dyes and dyeing methods are almost impossible to dye and can only be dyed with disperse dyes. However, the whole process of such dyeing can be completed under high temperature and high pressure.
[Polyester Dyeing Technology] Polyester Low Temperature Dyeing Carrier Formulation Technology