Abstract ▼ AI-Helper

engBlends dyeing such as polyester/cotton and nylon/cotton is usually carried out by two-bath or one-bath-two-step dyeing method using proper dyes and chemicals for each fibers. However, these dyeing methods are relatively time- consuming and complicated. The dyeing method of one-bath-two-step dyein...

engBlends dyeing such as polyester/cotton and nylon/cotton is usually carried out by two-bath or one-bath-two-step dyeing method using proper dyes and chemicals for each fibers. However, these dyeing methods are relatively time- consuming and complicated. The dyeing method of one-bath-two-step dyeing process is shorter than the two-bath method but there are some problems such as lower dyeability and poor reproducibility since different kinds of dyes are used in the same bath. In this regard, several researches have been conducted to improve the dyeability of blended fabrics. In the present study, in order to dye cotton/polyester and cotton/nylon blend fabrics by one-bath dyeing process with single disperse or acid dye, a novel hetero-bifunctional bridge compound (DBDCBS) was utilized. The DBDCBS was designed to contain two different reactive groups of α,β-di- bromopropionylamido and dichloro-s-triazinyl groups. The α,β-dibromopropionyl- amido group shows considerable reactivity towards amines or amino groups at acidic condition and high temperature. In contrast, the dichloro-s-triazinyl group has reactivity towards hydroxyl groups at alkaline condition and room temperature. The perfect one-bath dyeing method using a hetero-bifunctional compound (DBDCBS) to dye cotton/polyester blend by disperse dyes having amino groups was tried. One-bath one-step dyeing of cotton/polyester blend was successfully carried out using disperse dyes having amino groups and hetero-bifunctional bridge compound(DBDCBS). The dichloro-s-triazinyl group of DBDCBS reacts with hydroxyl groups of cellulose, and α,β-dibromopropionylamido group react with amino groups of disperse dye, forming covalent bridge between cotton and disperse dye. The optimum dyeing condition was pH 4 and 115℃. Color fastness, tensil strength, and handle were relatively good because of the colvalent bridge. Also, cotton/nylon blend fabrics were dyed with amino-containing acid dyes(C. I. Acid Blue 127:1, C. I. Acid Violet 19) using DBDCBS. DBDCBS forms covalent bridge between cotton and acid dye in the same manner. Optimum dyeing conditions were pH 4 and 100℃. Consequently, the solid color was obtained on cotton/nylon blend fabrics in one-bath dyeing process using only acid dyes. The DBDCBS did not show any negative effect on nylon side in terms of dyeing and physical properties.