① The pH value of the dye bath should be 5-6, which must be adjusted with acetic acid. It is best to use 1-2g/L ammonium acetate or sodium acetate as a buffer. Do not use the so-called “buffer” containing inorganic acids (SO2-4, CI-). Dyeing acid”. Because acetic acid will not damage cellulose fibers, it has wide adaptability to various types of dyes, such as disperse, cationic, weakly acidic, blended (D type) and other direct dyes that are resistant to weakly acidic media; even if a one-bath two-step method or two-step method is used, In bath dyeing, the residual acid on the fabric can be easily neutralized and cleaned; it will not affect the diffusivity of disperse dyes.
②It is very important to add dispersing and anti-staining agents. Because when dyeing multi-fiber blended fabrics, the dyes used are numerous and miscellaneous, and agglomeration is likely to occur during the dyeing process, resulting in contamination of the agglomerates, resulting in dyeing defects. Therefore, adding dispersant IW (flake) 1-2g/L or WA (liquid) 3-6mL/L to the dye bath can effectively resist agglomeration. If the anti-staining agent TA-309 (Shanghai Auxiliary Factory) is added at 1-2mL/L, it can not only increase the synergistic effect of anti-aggregation, but also significantly reduce the degree of mutual contamination of fibers with dyes, thereby improving the clarity and luster of dyed goods. Color fastness. In fact, these two additives can also prevent direct dyes from contaminating nylon and wool to a certain extent. According to other information, Nevadine AN is relatively stable to acid, alkali and hard water, and is a high-grade leveling agent for wool and nylon dyeing. When its dosage is increased to 5%-8% and boiled for 30-60 minutes, The color on the nylon will be obviously clear and pure, and the dyeing defects of the nylon can be repaired. This additive can reduce the staining of nylon, and will not produce foam during fabric operation, which may cause cloth clogging and affect the smooth progress of dyeing. Therefore, this additive is added in actual production to prevent the dye on the nylon from being oversaturated due to repeated dyeing of various dyes on the nylon. However, there is no need to add nylon dye resist to prevent interactions from affecting the effect and increasing costs.
③Polyester should be dyed with medium and low temperature disperse dye carrier method. In recent years, due to the increasing number of polyester-containing multi-fiber blended interwoven fabrics, many additive manufacturers (companies) are developing carriers. In fact, each carrier has certain adaptability to fabrics. It is necessary to choose a product that has a large puffing effect on polyester, has little damage to other fibers, does not contain carcinogens and organochlorines, and is easy to deload. There are very few black dyes suitable for carrier dyeing. It is planned to use disperse blue 2BLN 3.5% and red 3B2. 2% Japanese yellow SE-3R1.8% (Hangzhou Jihua) dye is used for dyeing, and the blackness is very good. Dispersed black EX-SF (300%) is not suitable for multi-fiber blended fabrics, but sometimes in order to adjust the color, high-temperature dyes can be used in small amounts and cannot be used as the main color.
④The heat preservation and dyeing time is longer than that of single fiber. Because a piece of fabric contains more than three fibers, three related dyes are generally added. The more dyes are added to the same bath, the worse the dispersion of the dye bath will be, so dispersants and anti-contamination agents should be added to prevent aggregation and mutual contamination. In order to further allow the dye adsorbed on the fiber to continue to diffuse, migrate and dye, the time needs to be appropriately extended. Practice has proved that only after long-term boiling and dyeing can the dyeing rate of various dyes be improved, and the color will be clear and pure, and have a certain degree of stability.��fastness. Therefore, the dyeing time of multi-fiber blended fabrics is 1/2 or 1/3 longer than that of single fiber fabrics. If various liquid flow machines are used, due to the frequent collision probability between dyes and fibers in the dye bath and the high heat, the extension time can be appropriately shorter; while jig dyeing machines and yarn dyeing machines (regardless of hank or simple yarn dyeing), Especially for spray-type yarn dyeing machines and room-temperature flip-type garment dyeing machines, the length can be appropriately longer in order to achieve a dyeing balance and ensure quality.
⑤ Reasonable selection and increase in dosage of dyes. When dyeing polyester with disperse dyes, the dyeing rate of nylon is also very high because it is not limited by the terminal amino groups of nylon. At the same time, it can dye nylon with ammonia bonds and van der Waals forces, sometimes more than polyester. If In addition, with the presence of acidic or neutral dyes and direct dyes, the color development on nylon will be oversaturated. Therefore, there is no need to use additional nylon dyes. But before the dyeing is completed, if the hue of nylon does not match that of other fibers, you can choose a weakly acidic dye of the corresponding color to complement the color (flattening). The dyeing method is similar to that of wool. However, when selecting, strive to have consistent compatibility and directness of various dyes to reduce the phenomenon of competing dyes. If competitive dyeing occurs, in order to ultimately achieve a dyeing balance and reduce mutual staining, in addition to extending the holding time, the actual dosage of dyes for various fibers is increased by 20-50% compared with the actual dosage of a single fiber. This is the dyeing characteristic of multi-fiber blended fabrics, that is, there is a large amount of dye residue in the foot water, which needs to be fully washed to remove it. Of course, if there is less viscose fiber, such as when the content is only 10%-15%, if additional dye is added to 7%-8% of the total weight of the fabric (owf), it will often turn into dark brown. In order to achieve an ideal dyeing rate of direct dyes, appropriate electrolyte (Na2SO4) can be added before final dyeing to promote dyeing without affecting the color change of other dyes. In order to ensure good dispersion of the dye bath, it is important not to add electrolytes at the beginning of dyeing.
⑥Choose the appropriate dyeing machine according to the performance and content of fibers on the textile. For example, for “five-in-one” dyeing, it is better to choose a differential constant speed jigger dyeing machine because rope dyeing is used.
Extended reading: https://www.yingjietex.com/product/Semi -dull-Nylon-taffeta-Fabric.html
Extended reading: https:// www.china-fire-retardant.com/post/9407.html
Extended reading:https://www.yingjietex.com/product/750D-Polyester-Three-Color-Double-Thread-OXFORD-Fabric.html
Extended reading: https://www.alltextile.cn/product/product-12-607.html
Extended reading: https://www.yingjietex.com/product/Mic -fiber-pongee-with-Calender-Fabric.htm
