Study of Deep-Dyeing with Appropriation Dyes on Fine-Denier Polyamide Fabrics

Study of Deep-Dyeing with Appropriation Dyes on Fine-Denier Polyamide Fabrics
　　Clothing that are made from fine-denier polyamide, have the character of redressing, non-ironing , dimension stability , little shrinkage bearing climate , suppleness , chubbiness ,good pendency, strong elegant feeling , good breathing , comfortableness , and also have the sense of quality and function that natural fibre does not have,which make fine-denier polyamide fiber good wearability , so it can manufacture new spinning and weaving material. During the past few years, with the development of polyamide fibre, the prospect of replacing polyester by polyamide is increasing. But because of the structure characteristic of fine-denier polyamide fibre: The diameter of fibre is small, whose fibrous specific surface area of per weight is large, it determined that dyeing on fine-denier polyamide fiber has much difficulties.
　　This article mainly choose the right dyes, improve the dyeing craft and add special assistants in order to improve the dye on fine-denier polyamide fibre.Previously, the main dyes on Polyamide fibre dyeing is acid dyes, it can use reactive dyes, direct dyes and disperse dyes theoretically, but the defect is not all good. Since 1990s, the rare earth began to apply to dyes dyeing, the rare earth magnets result is outstanding. Rare earth (RE or R) is thorter of 17 kinds elements that is the lanthanides chemical elements of the periodic table --lanthanum (La) , cerium (Ce), praseodymium (Pr), neodymium (Nd) , promethium (Pm) , samarium (Sm) , europium (Eu) , gadolinium (Gd) , terbium (Tb) , dysprosium (Dy) , holmium (Ho) , erbium (Er) , thulium (Tm) , ytterbium (Yb) , lutecium (Lu), and two elements scandium (Sc) and yttrium (Y) closely related to 15 elements of lanthanum department. http://www.chinamagnets.biz/ The rare-earth elements are representative metallic elements, their metal lively is next only to alkali metal and the alkaline earth metallic elements, but more lively than the other metallic elements.
　　The rare earth ion make a combination combining with the base group such as -OH, -N=N- , -SO32+, which make the rare earth applying to printing and dyeing industry. The rare earth article was used as a kind of assistant in dyeing to increase color depths, level dyeing etc.The results indicated that the function being able to raise the dye-up of the acid dyes and the reactive dye and acquire color depths obviously by choosing the right dyeing craft on fine-denier polyamide fibre dyeing: right original temperature, the temperature rate, the temperature and the time of preserving heat, the appropriate pH value, adding the right rare earth assistant, controlling salt and alkali, and the dyeing fabric frictional fastness, wash and light fastness improved greatly.
　　It is easy to operate with adding the rare earth in dyeing, and the dye-up curve of three-primary colours are still consistent, it is beneficial to use the rare earth magnets rare earth assistant to dye. In acid dyes dyeing process,the best dyeing method is adding rare earth CeO2, whose dosage is 1% (o.w.f) , the pH value is 4, the bath ratio is 1: 20 , levelling agent dosage is 10 mL/L, which can acquire a good result; In reactive dyes dyeing process, the best dyeing method is adding rare earth La2 (CO3)3, whose dosage is 1% (o.w.f) , the pH value is 4 , the bath ratio is 1: 20, salt dosage is 30 g/L, sodium carbonate dosage is 10 g/L; A new reactive dyes dyeing method been studied in the article in acid conditions, during the period of reactive dyes dyeing, the color strengthened by adding alkali in dyeing later stage ,This craft not only increases the dye-up of dyes, but also decreaces the dosage of salt and alkali, it is one kind of new economical and environmental protection dyeing. http://www.chinamagnets.biz/    The three kinds of crafts condition carry out with large amount of testing, it can gain bright-colored polyamide cloth commonly. Test have also tested the craft, the temperature , pH value and the dispersant effect dyeing on polyamide fibre , it also have got good achievement.This article studies the dyeing on fine-denier polyamide fibre by using of the rare earth, and recrives fairly good effect, it provides an important reference value for application.