Liquid colorant for coloring polyester fiber stock solution and preparation method thereof

Abstract

The invention discloses a liquid colorant for coloring polyester fiber stock solution. The liquid colorant comprises the following components by weight percent: 65 to 95% of liquid dispersion medium, 3 to 30% of colorant, 2 to 5% of dispersing agent and the like. According to the liquid colorant disclosed by the invention, a pigment or a dye and a liquid carrier are processed by dispersion equipment, such as grinding by a grinding machine and the like; a dispersion degree and a pigment utilization rate are high; the liquid colorant has the advantages of high storage stability, good coloring effect and the like.

Description

technical field [0001] The invention relates to the technical field of a liquid colorant and a preparation method thereof, in particular to a liquid colorant for polyester fiber stock solution coloring and a preparation method thereof. Background technique [0002] Polyester fiber is a polyester obtained by polycondensation of dibasic acid and dibasic alcohol, and then a synthetic fiber obtained by melt spinning. Polyester fiber is widely used in many fields such as clothing, decoration, toys, etc., and is the largest output of synthetic fibers. varieties. [0003] The coloring of polyester fibers can be divided into two categories: post-spinning coloring and pre-spinning coloring. Post-spinning dyeing generally uses dyes to dye polyester fibers in aqueous solution under high temperature conditions, which has the disadvantages of high energy consumption and large waste water discharge. Pre-spinning coloring is also called stock solution coloring. It is to add colorant to t...

AI Technical Summary

Problems solved by technology

However, there are three disadvantages in using masterbatches to color polyester fibers: 1) During the production of masterbatches, the dispersion of pigments in the carrier is completely dispersed by mechanical shear between the screws. Therefore, on the one hand, polyester color The production of masterbatches has low processing precision for pigments. On the other hand, there are great requirements for the dispersibility of pigments themselves, which limits the selection range of pigments; 2) Color masterbatches for polyester fibers such as polyester are easy to absorb water and get wet Avoid hydrolysis, must be dried before use

However, since the boiling point of ethylene glycol is only 197°C under normal pressure, and the polyester polymerization reaction has a high temperature above 210°C, when ethylene glycol-based pigment paste is added during the polymerization process, ethylene glycol evaporates quickly, and the pigment May agglomerate momentarily, which can cause dispersion problems of the colorant in the polymer and reduce the tinting strength of the pigment

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