Method for preparing environmentally-friendly polyester fibers through dope dyeing

Abstract

The invention belongs to the technical field of preparation of polyester fibers, and concretely relates to a method for preparing environmentally-friendly polyester fibers through dope dyeing. The method for preparing environmentally-friendly polyester fibers through stock solution coloring comprises the following steps: blending an environmentally friendly dye with a solvent, a dispersant and a wetting agent to prepare a dope dyeing liquid color paste; injecting one or two or more liquid color pastes to a polyester melt pipeline through a metering injection pump; and uniformly mixing polyester melt and the liquid color paste(s) through a static mixing device, conveying the obtained mixture into a spinning box body, and spinning. Dope dyed fibers are prepared in the invention without a high pressure or a high temperature, and a dyeing system with the advantages of high temperature resistance, excellent color fastness, intermiscibility with polyester melt, realization of stable dispersion, environmental protection and simple operation is constructed.

Description

technical field [0001] The invention belongs to the technical field of polyester fiber preparation, and in particular relates to a method for preparing environmentally friendly polyester fiber by dope coloring. Background technique [0002] Dope-dyed polyester fibers are fibers that are dyed on polyester melt and then spun. Compared with conventional dyeing methods, dope-dyed fibers do not need to be dyed in subsequent processes, which reduces the production cost of fiber dyed yarns and reduces It reduces the consumption of water and energy, and has obvious advantages in energy saving and emission reduction. At the same time, the colored fiber produced by the dope coloring technology has uniform color and high color fastness. . [0003] At present, the stock solution coloring technology also has some defects in the actual production process, such as difficult color adjustment, difficult to determine the color scheme, and not suitable for small batch production. Therefore, ...

AI Technical Summary

Problems solved by technology

Invention patent Chinese invention patent CN103255498A (the patent number is CN201310147346.X, the invention name is "a method for preparing colored polyester fiber by dope coloring") has been improved by adding liquid color paste on-line and polyester melt direct spinning The combination of technology solves the problems of high temperature, high pressure or loaded dyeing method, which cause the colored sewage to be treated with difficulty, high cost, and direct discharge will cause serious environmental pollution. Intermittent methods such as raw material chip blending spinning method, color masterbatch and raw material chip blending spinning method cause high energy consumption, high unit consumption, and large product batch differences. However, the preparation of the dyeing system requires the polyester carrier adipic acid The mixture with 1,3-butanediol is reacted under nitrogen protection, temperature rise, and heat preservation until the acid value is 10, and then distilled under reduced pressure at 6.67-8.00kPa for 1 hour. The industrial implementation is relatively cumbersome