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Preparation method of disperse dye ordinary-pressure low-temperature easily-dyeable superfine fibers

A technology of disperse dyes and ultrafine fibers, which is applied in the direction of chemical post-treatment of single-component copolyester rayon and synthetic polymer rayon, which can solve the problems of application limitations, difficulty in dyeing dark colors, etc., and improve water absorption Performance, improved dyeability, easy access effect

Active Publication Date: 2021-06-15
ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cationic low-temperature dyeing is not easy to dye dark colors, so its application is limited

Method used

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  • Preparation method of disperse dye ordinary-pressure low-temperature easily-dyeable superfine fibers
  • Preparation method of disperse dye ordinary-pressure low-temperature easily-dyeable superfine fibers

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preparation example Construction

[0036] A method for preparing disperse dyes at normal pressure and low temperature and easy to dye superfine fibers, comprising the following preparation methods:

[0037] (1) Preparation of low-temperature easy-to-dye modified copolyester:

[0038] (1.1) Mix terephthalic acid, ethylene glycol and a titanium catalyst for esterification reaction at 225-235°C and a pressure of 0.1-0.3Mpa for 1.5-2.5h, and control the esterification rate above 85% to obtain an esterified product; the titanium catalyst is added The amount is 5ppm based on the proportion of Ti atomic mass to the theoretical polyester production amount;

[0039] (1.2) Add diol and polyester polyol to the esterified product, then react at 255-265°C and 50-150pa pressure for 40-60min to carry out precondensation, and react at 265-275°C and 100-120pa pressure for 1.5- 2.5h to carry out final polycondensation, discharge, and prepare low-temperature easy-to-dye modified copolyester; the alkyd ratio of the ethylene glyco...

Embodiment 1

[0049] A method for preparing disperse dyes at normal pressure and low temperature and easy to dye superfine fibers, comprising the following preparation methods:

[0050] (1) Preparation of low-temperature easy-to-dye modified copolyester:

[0051] (1.1) Mix terephthalic acid, ethylene glycol, and a commercial titanium-based polyester catalyst at 230°C and 0.2Mpa pressure for an esterification reaction for 2 hours, and control the esterification rate to more than 85% to obtain an esterified product; the addition of the titanium catalyst is The proportion of Ti atomic mass to the theoretical polyester production is 5ppm;

[0052] (1.2) Add 4wt% of 2-methyl-1,3-propanediol and 2wt% polyethylene adipate (PEA-2000) of low-temperature easy-to-dye modified copolyester in the esterified product, followed by React at 260°C and 100pa pressure for 50 minutes for pre-condensation, react at 270°C and 110pa pressure for 2 hours for final polycondensation, and discharge the material to pr...

Embodiment 2

[0056] A method for preparing disperse dyes at normal pressure and low temperature and easy to dye superfine fibers, comprising the following preparation methods:

[0057] (1) Preparation of low-temperature easy-to-dye modified copolyester:

[0058] (1.1) Mix terephthalic acid, ethylene glycol, and a commercial titanium-based polyester catalyst at 235°C and 0.3Mpa for an esterification reaction for 1.5 hours, and control the esterification rate to more than 85% to obtain an esterified product; the amount of titanium catalyst added The theoretical polyester production amount based on Ti atomic mass is 5ppm;

[0059] (1.2) Add 4wt% of 2-methyl-1,3-propanediol and 2wt% polyethylene adipate (PEA-2000) of low-temperature easy-to-dye modified copolyester in the esterified product, followed by React at 265°C and 150pa pressure for 40min for pre-condensation, react at 275°C and 120pa for 1.5h for final polycondensation, and discharge to prepare low-temperature dyeable modified copoly...

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Abstract

The invention discloses a preparation method of disperse dye normal-pressure low-temperature easily-dyeable superfine fibers, and relates to the technical field of modified copolyesters. The preparation method comprises the following steps that (1), low-temperature easily-dyeable modified copolyester is prepared; (2), sea-island composite spinning is carried out, specifically, the alkali-soluble polyester and the low-temperature dyeable modified copolyester are pre-crystallized and dried, and then spinning and winding is carried out by taking the alkali-soluble polyester as a sea part and the low-temperature dyeable modified copolyester as an island part to obtain sea-island composite fibers; and (3), alkali solution treatment is carried out, specifically, the sea-island composite fibers are treated with an alkali solution to remove the sea part, and the disperse dye normal-pressure low-temperature easily-dyeable superfine fibers are prepared. The addition of the dihydric alcohol and the polyester polyol destroys the regularity of an original PET molecular chain and increases the amorphous region of the polyester, so that dye molecules are easier to enter, the dyeability is improved, and the water absorption performance of the polyester fiber can be improved while the stability of the polyester is not influenced.

Description

technical field [0001] The invention relates to a preparation method of a modified copolyester, in particular to a preparation method of a disperse dye superfine fiber easily dyed at normal pressure and low temperature. Background technique [0002] Conventional polyester fiber has a symmetrical linear macromolecular structure, which is closely arranged, and the fiber structure is relatively rigid due to the existence of the conjugated system, so disperse dyes can only be dyed under high temperature and high pressure. In order to improve the dyeing performance of polyester fibers, chemical or physical modification methods are usually used to change the molecular structure of polyester fibers, such as introducing groups that can accept dye molecules to the macromolecular chain, increasing the amorphous region to make dyes easier Enter or improve by adding color masterbatch coloring method. Dyeable polyesters are generally divided into two categories: cationic dyes, normal pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/84D01F11/08C08G63/183C08G63/85
CPCD01F6/84D01F11/08C08G63/183C08G63/85
Inventor 刘园园李皓岩董海良王晶晶王文
Owner ZHEJIANG HENGYI PETROCHEMICAL RES INST CO LTD
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