PET/PTT (Polyethylene Terephthalate/Polytrimethylene Terephthalate) bi-component comfortable stretch yarn dyeing process

Abstract

The invention discloses a PET / PTT (Polyethylene Terephthalate / Polytrimethylene Terephthalate) bi-component comfortable stretch yarn dyeing process, which comprises the following steps of respectively melting PET poly-vinegar slices, PTT poly-vinegar slices and a third high polymer material in a melting device, then respectively entering a composite spinning nozzle through a metering pump, and spinning to obtain composite filaments through extrusion; carrying out drafting treatment and heat treatment on the composite filaments to form a curled comfortable elastic structure; and uniformly mixing and co-melting the third high polymer material with a pigment or a color master batch before entering the composite spinning nozzle. The process is uniform in dyeing and high in color fastness, cannot generate adverse effects on PTT and PET, and even can protect PTT and PET, so that aging of the PTT and the PET is reduced, the quality stability of the PTT and the PET is improved, and the service life the PTT and the PET is prolonged.

Description

technical field [0001] The invention belongs to the technical field of fiber material preparation devices, in particular to a PET / PTT two-component elastic silk dyeing process. Background technique [0002] At present, ordinary polyester fibers are gradually becoming saturated in the market due to their low added value and high degree of homogeneity. The research and development of differentiated polyester fibers such as self-curling fibers is becoming increasingly important. Usually, the crimped fiber is permanently crimped by physical and mechanical action through the crimping device of the fiber, while the self-crimping fiber does not need to be specially crimped, and only needs to be drawn and heat-treated to make its potential crimp appear. The processing cost of fibers can be significantly reduced. Side-by-side polyethylene terephthalate (PET) / polytrimethylene terephthalate (PTT) uses the large difference in heat shrinkage between the PET component and the PTT compone...

AI Technical Summary

Problems solved by technology

However, these two methods have certain inherent shortcomings. Dyeing with disperse dyes is prone to uneven dyeing, large changes in dye uptake, low color fastness, uneven dyeing depth, and large differences in the parameters of PTT and PET dyeing. It is easy to be dyed into two colors or different colors and other disadvantages; while the method of adding color masterbatch has better color fastness, but the final color is difficult to control, the color is uneven, and the pigment of the masterbatch will appear in different materials. Different colors, so the predictability of coloring results is poor; and the addition of color masterbatch will have a significant adverse effect on the strength and elasticity of PTT and PET, especially affecting the strength, the product is easy to deform and twist; and more color masterbatch needs to be added , and it is necessary to use higher heat-resistant pigments, resulting in waste and a significant increase in cost