HETERO-BI-FUNCTIONAL COMPOUND AND ONE-BATH DYEING METHOD OF PET/COTTON UNION FABRICS USING HETERO-BI-FUNCTIONAL COMPOUND

摘要

A hetero-bi-functional compound and one-bath dyeing method of PET/cotton union fabrics by using the same hetero-bi-functional compound are provided to reduce dyeing process and wastewater production by performing the dyeing of both PET(polyethylene terephthalate)- and cotton-based fabrics with one dispersion dye in one bath. The hetero-bi-functional compound represented by the formula(1), containing difluoromonochloropyrimidine group capable of covalently binding to hydroxyl group in the cotton fabrics, and alpha, beta-dibromopropionylamido group capable of covalently binding to the amino group of dispersion dye is provided. The one-bath dyeing method of PET/cotton union fabrics comprises the steps of: dissolving 0.1-20% of hetero-bi-functional compound in water, adding sodium carbonate into the solution to regulate pH to 9.5-10.5, and adding 50-200g/L of neutral sa inserting PET/cotton union fabrics into the solution, heating the solution to 50 deg. C at a rate of 0.5 deg. C/min to covalently bond the difluoromonochloropyrimidine group of the hetero-bi-functional compound to the hydroxy group of the cotton fabric part in the PET/cotton union fabrics; dispersing the dispersion dye containing the amino group into the solution and adding acetate into the solution to regulate pH to 4; and heating the solution at 110-120 deg. C to dye the PET part by the dispersion dye, and covalently bond the alpha, beta-dibromopropionylamido group of the hetero-bi-functional compound to the amino group of the dispersion dye.