Abstract: The principle cotton spandex fabric and stripping stripping process, combined spandex at high temperatures without alkali features; oxygen bleaching using the new process in place of caustic soda and stripping, outlines the principle of correction and re shade Dyeing process, pointing out production considerations.
With the development of the times, people are increasingly demanding high quality of fabric clothing, especially exports to Europe and the fabric, the appearance quality (color light, color, character-like) more stringent requirements. The dyeing process, often due to various causes staining depth of emphasis, not on the shade, color stains and other defects can not be directly corrected, thus the need for stripping stained fabrics that have been dyed. Most cotton spandex fabric dyed with Reactive Dye-based, light-colored series of stripping is more thoroughly. However , it is relatively difficult for dark fabrics, and there are many residual pigments . The whiteness of the fabric after peeling is not enough and the strength loss is too large. Together with the spandex sensitive to basic conditions, the stripping has certain technical difficulty. For this, the author of the fabric spandex chemical processing characteristics, and adopt hydrosulfite stripping - hydrogen peroxide bleaching of Reactive dyes spandex fabric stripping process were studied, and a reasonable stripping counterstaining Processing technology.
1. Stripping principle and process
1.1 Stripping principle
Stripping, that is, the use of chemical damage to the dye on the fiber so that it can not develop. All kinds of stripping methods use the covalent bonds formed by dyes and fibers to have limited oxidation resistance, alkali resistance, chlorine bleach resistance and other properties. The chemical bond is broken, the dye is shed from the fiber, and the fabric surface becomes lighter in color. Chemical stripping agents are commonly used in the insurance powder, white powder, which by destroying the dye system in the molecular structure of the color to achieve the purpose of fading or achromatism. Cotton Spandex fabrics are often stripped with the soda ash of the insurance powder, which not only achieves the stripping effect but also does not damage the fabric strength and meet the needs of dyeing and finishing.
1.2 Stripping prescriptions and crafts
1.2.1 Stripping prescription
Cotton fabric commonly used stripping hydrosulfite - soda, while the spandex in the fabric is cotton, because it contains 3% to 5% of the spandex fiber, spandex resistant to alkali, in particular at high temperature, caustic ammonia Lun from decomposition effect, it is cotton spandex fabric finishing need to minimize the concentration of caustic soda, and the temperature is not too high. The production of caustic soda is often used in place of soda, since less basic, more moderate effect on spandex. Stripping prescriptions see Table l.
Table l Cotton Spandex Fabric Stripping Prescription
Scouring agent soda ash Insurance powder temperature Bath ratio
2% 10 % 8 % 90 °C l : 10
1 . 2 . 2 Stripping process (slightly)
1.3 Oxygen bleaching prescription and process
1.3.1 Oxygen bleaching prescription
After stripping fabric whiteness often enough, reach staining requirements. When color is recolored after stripping , the whiteness of the fabric is more demanding . Therefore , the bleached fabric will give better whiteness after stripping . Because the fabric contains spandex , spandex fibers in the hypochlorite solution combine with nitrogen and chlorine to damage the fiber and cause serious damage . Therefore, bleaching of fabrics containing spandex cannot use chlorine bleach . The spandex has good stability to oxygen bleach , but the peroxide concentration in the solution should not be too high . Similarly , taking into account that caustic soda will have a greater damage to the spandex fiber , so the use of soda ash bleaching , the effect is more moderate , fabric elasticity will not have a significant impact. The bleaching prescription is shown in Table 2.
Table 2 Cotton Spandex Fabric Bleaching Prescription
H202 The scouring agent Na2C03 bath ratio
4% 2 % 3 % 1 :10
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