High-color-fastness dyeing technology for polyester-cotton knitted fabric

Abstract

The invention discloses a high-color-fastness dyeing technology for a polyester-cotton knitted fabric, and relates to the field of printing and dyeing. The technology is characterized by comprising the following steps of S1, pre-treatment; S2, primary dyeing, S3, cleaning, wherein surface dye on the polyester-cotton knitted fabric is removed by a cleaning agent for 8-10 min at the temperature of 92-98 DEG C, and the concentration of the cleaning agent is 1.5-2 / L; S4, secondary dyeing; S5, discharging; the cleaning agent is prepared from, by weight, 42-48 parts of a reducing agent, 10-12 partsof an anti-staining agent and 25-30 parts of sodium hydroxide; the anti-staining agent is prepared from isomeric alcohol ethoxylates, sodium tripolyphosphate and isopropanol, and the weight ratio of isomeric alcohol ethoxylates to sodium tripolyphosphate to isopropanol is 1:1:1.5. In the cleaning process in S3, the cleaning agent contains the anti-staining agent, therefore after the reducing agentremoves dispersed dye on the surfaces of fibers, the anti-staining agent can react with the dispersed dye, the dispersed dye cannot be attached to cotton fibers or polyester fibers, the removing effect is good, reduction cleaning does not need to be conducted many times, the efficiency is high, and water and electricity are saved.

Description

technical field [0001] The invention relates to the field of printing and dyeing, in particular to a process for dyeing polyester-cotton knitted fabrics with high color fastness. Background technique [0002] Knitted fabric refers to the fabric formed by bending the yarn into loops with knitting needles and interlacing them with each other. Its material can be cotton, polyester, acrylic, polyester-cotton, etc. It is often used to produce underwear and T-shirts. Because polyester-cotton knitted fabrics contain two different fibers, the dyeing process is often a two-bath method. Dyeing is the process of chemical or physical chemical combination of dyes and fibers, or the formation of insoluble colored substances on fibers. Color fastness refers to the degree of fading of dyed fabrics under the action of external factors (extrusion, friction, washing, rain, etc.) during use or processing, and is an important indicator of fabrics. [0003] The Chinese patent with the notificat...

AI Technical Summary

Problems solved by technology

The reduction cleaning agents in the above dyeing process are commonly used sodium hydrosulfite and sodium hydroxide. On the one hand, sulfur dioxide that pollutes the environment will be released during the use of hydrosulfite. On the other hand, the disperse dyes removed from polyester fibers are easy to adhere to cotton fibers. Affects the color fastness of fabrics and requires multiple reduction cleanings, which is not only inefficient, but also wastes water and electricity resources, which needs to be improved

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