Dyeing method of cotton type polyester staple fibers produced from PET bottom cut pieces

Abstract

The invention discloses a dyeing method of cotton type polyester staple fibers produced from PET bottom cut pieces. The dyeing method is characterized by specifically comprising the following steps: a, selecting an alkali-resisting disperse dye and grinding until the fineness reaches 2 microns, b, adopting a pretreatment dyeing one-bath-one-step process, firstly, adding regenerated polyester staple fibers to a dye jar, dissolving a pure alkali agent, an even penetrating agent GL and a chelating dispersant DF101 according to a dyeing bath ratio of 1: (5-7) and putting into the dye jar, and adding the alkali-resisting disperse dye to obtain mixed dye liquor; C, regulating the pH value to the range of 13-14, gradually increasing the temperature to the range of 128-132 DEG C and preserving heat for 1 hour; and D, performing water washing, soap boiling and water washing on the dyed fibers, thereby finishing dyeing. The dyeing method is used for solving the problem of uneven dyeing of the cotton type polyester staple fibers produced from the PET bottom cut pieces; small-batch and multi-variety production is realized, the requirements of market variety diversification are met, the process time is greatly shortened, the yield is improved, the environment can be protected, the dye-uptake can be above 90%, the color fastness is high and the usability of the products is improved.

Description

technical field

[0001] The invention belongs to the technical field of dyeing polyester staple fibers, and relates to a method for dyeing polyester staple fibers, in particular to a method for dyeing cotton-type polyester staple fibers produced from PET bottle flakes. Background technique

[0002] The traditional method of dyeing polyester staple fiber is high temperature and high pressure dyeing with traditional disperse dyes. The dyeing is characterized by previous treatment for impurity removal, high temperature and high pressure dyeing, two-bath method, more water, and uneven dyeing of recycled polyester staple fibers. The specific process is pretreatment of raw materials to remove impurities-high temperature and high pressure dyeing-washing-soaping-washing-drying. The disadvantages are high cost, long production process, high water consumption and high energy consumption. For this reason, people are actively looking for a method for dyeing polyester staple fibers with ...