Preparation method of easily dyed polyester fiber with high hydrophilicity

Abstract

The invention relates to a preparation method of an easily dyed polyester fiber with high hydrophilicity. The preparation method comprises the following steps: performing esterification by stages, wherein dihydric alcohols, polyhydric alcohols and polyethylene glycol macromolecules are mixed according to a certain mole ratio, in the first esterification stage, acid is slightly excess to ensure that parts with low capability of participating in esterification reaction in the polyhydric alcohols fully react and are grafted into polyester molecular chains, and in the second esterification stage, the dihydric alcohols are replenished to control the terminal carboxyl group of copolyester; and then performing condensation polymerization to prepare the easily dyed polyester with high hydrophilicity. The preparation method has the advantages that the easily dyed polyester fiber with high hydrophilicity is finally prepared by carrying out melt spinning on easily dyed polyester with high hydrophilicity; polyhydric active sites in the fiber, ether bonds in flexible chain polyethylene glycol and sulfonate groups in binary acid have strong adsorption functions and can endow the fiber with good moisture absorption property and dyeing property; the easily dyed polyester fiber with high hydrophilicity can be widely used for preparing moisture absorbing and sweat releasing antistatic fibers made into fabrics next to the skin; the easily dyed polyester fiber with high hydrophilicity has an obvious modification effect and is especially suitable for the melt direct spinning process.

Description

Technical field [0001] The invention belongs to the technical field of polyesters, and relates to a method for preparing highly hydrophilic and easily dyeable polyester fibers, in particular to a method of introducing polyhydroxy functional groups and flexible chains from the polyester molecular level by means of polymerization, and then undergoing circular or irregular shapes. A method for preparing highly hydrophilic and easily dyeable polyester fiber by melt spinning forming of a spinneret. Background technique [0002] In 2011, my country's polyester fiber output was 27.95 million tons, accounting for 83% of my country's chemical fiber output and 70% of the world's polyester fiber output. Although my country's polyester production capacity and output rank first in the world, my country's polyester fiber industry still faces some outstanding problems that need to be resolved: unreasonable product structure, fierce homogeneity competition, and low industry profit margins. Unde...

AI Technical Summary

Problems solved by technology

Although my country's polyester production capacity and output rank first in the world, my country's polyester fiber industry still faces some outstanding problems that need to be solved urgently: unreasonable product structure, fierce homogenization competition, and low profit margins in the industry

However, due to the large relative molecular weight of the polyethylene glycol added in the esterification stage, the activity of participating in the transesterification reaction is low, and there are still some unreacted polyethylene glycol after the reaction, which not only causes waste of raw materials, but also free polyethylene glycol. Vacuuming of alcohol macromolecules is prone to pipe blockage, and uneven distribution in polyester will have a serious impact on subsequent spinning and forming

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