Study On The Production Technique And Dyeability Of Cation-islands-in-the-sea Fiber

The cation-islands-in-sea superfine polyester fiber was produced in the existing production line in order to ensure the splitting completeness of conjugated fibers and to improve the dyeability of the resulted fabrics. The production process factors and the properties of both cation dyeable polyester chips (CDP) and water soluble polyester chips (COPET) were investigated in detail. The following aspects of the production technique were carefully studied: (1) The thermal performance and crystallinity of both COPET and CDP; (2) The rheological properties of both COPET and CDP; (3) The optimization of the production process parameters; (4) The microstructure and properties of cation-islands-in-sea superfine polyester fiber; (5) The splitting completeness of conjugated fibers and the dyeability of the resulted fabrics. The main important findings were as follows: (1) The imported COPET with Tg 55.89℃, Tcr 121.27℃and Tm 245℃, all higher than those of the domestically made, was selected as continuous phase, while the product CDP#1 with the molten crystallization peak broad and sharp, made from Yizhen, was chosen as disperse phase. (2) CDP, PET and COPET were all non-Newtonian fluids, and the apparent viscosity of CDP was biggest while the viscosity of COPET was least; the viscous flow activation energy of CDP was smaller than that of PET. And this implied that CDP would have temperature-insensitive apparent viscosity, good spinnability, and big spinning temperature window in comparison with PET. (3) The cation-islands-in-sea superfine polyester fiber very easily accumulated static electricity in both the spinning and texturizing processes, and thus the specialized finish oil was needed. (4)Under the conditions of 1 wt% NaOH solution, bath ratio 1:15, 100℃and lasting for 50 min, the continuous phase was totally removed, and the cation island filaments were split completely, not the case for PET. (5) The cation-islands-in-sea superfine polyester fiber was successfully resulted with the dpf of island filaments 0.052dtex (130dtex/48f-36island), split completeness and bright-coloured when the imported COPET was used as sea component and CDP#1 from Yizhen as island component. The technical innovations in the work may include following points: (1) The production technique for the cation-islands-in-sea superfine polyester fiber; (2) The product of cation-islands-in-sea superfine polyester fiber;...