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Method for preparing cationic dye deeply dyed copolyester fibers at normal pressure

A cationic dye, atmospheric pressure deep dyeing technology, applied in the field of preparation of cationic dye atmospheric pressure deep dyed copolyester fiber, can solve the poor thermal stability and spinnability of ECDP fiber, limit the expansion of the application of modified polyester fiber, high Melt viscosity affects problems such as polymerization and spinning, and achieves the effect of promoting technology upgrading, broad market application prospects, and reducing cost

Inactive Publication Date: 2011-09-28
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the domestically developed high-temperature and high-pressure dyeable copolyester fiber CDP and atmospheric pressure dyeable copolyester fiber ECDP and HCDP are all obtained through copolymerization modification, which has improved the disadvantage of poor dyeability of polyester fiber, but still exists. There are many shortcomings, such as CDP fiber needs high temperature and high pressure dyeing, ECDP fiber has poor thermal stability and spinnability, and the high melt viscosity of HCDP copolyester affects polymerization and spinning, etc., which limits the expansion of these modified polyester fibers. application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] SULET copolyester chips are placed in a vacuum drum dryer with a steam pressure of 0.2Mpa and a vacuum degree of ≤100Kpa, and dried at 100°C for 8 hours to obtain dry spinnable chips with a moisture content of less than 50PPM. Using the above-mentioned SULET dry spinnable chip as raw material (the molar ratio of PTA, SIPE, MPO and NPG units in the SULET copolyester macromolecule is 1:0.015:0.004:0.036), melt spinning short fibers, the screw temperature is 270 ° C, The spinning speed is 400m / min, the drawing temperature is 70-80°C, the drawing ratio is 3.26, the pre-stretching is 1.02, the first drawing ratio is 2.85, the second drawing ratio is 112, the drawing speed is 180m / min, and the drawing bath is 70 °C, the second drawing temperature is 80 °C, the relaxation temperature of each zone is 80 °C / 80 °C / 75 °C / 75 °C, the obtained short fiber specification is 3.33detx×38mm, the fineness is 3.24dt, the breaking strength is ≥3.18cN / dt, and the elongation 30.7%, 180 ℃ dry h...

Embodiment 2

[0036] SULET copolyester chips are placed in a vacuum drum dryer with a steam pressure of 0.2Mpa and a vacuum degree of ≤100Kpa, and dried at 170°C for 12 hours to obtain dry spinnable chips with a moisture content of less than 50PPM. Using the above-mentioned SULET dry spinnable chip as raw material (the molar ratio of PTA, SIPM, MPO and NPG units in the SULET copolyester macromolecule is 1:0.020:0.020:0.060), the hollow short is melt spun by using a hollow special-shaped spinneret. Fiber, screw temperature 320°C, spinning speed 1100m / min, drawing temperature 70-80°C, draw ratio 3.39, pre-stretch 1.007, first draw ratio 2.95, second draw ratio 114, draw speed 128m / min, stretching bath 70°C, second drawing temperature 80°C, relaxation temperature of each zone 80°C / 80°C / 75°C / 75°C, the hollow short fiber specification is 3.0detx×64mm, fineness 2.77dt, breaking strength ≥3.3cN / dt, elongation 32.6%, dry heat shrinkage 20% at 180°C, hollowness 18.5. The dyeing rate of the spun fi...

Embodiment 3

[0038] SULET copolyester chips are placed in a vacuum drum dryer with a steam pressure of 0.2Mpa and a vacuum degree of ≤100Kpa, and dried at 120°C for 12 hours to obtain dry spinnable chips with a moisture content of less than 50PPM. Using the above-mentioned SULET dry spinnable chip as raw material (the molar ratio of PTA, SIPE, MPO and NPG units in the SULET copolyester macromolecule is 1: 0.030: 0.050: 0.050), melt spinning cross special-shaped short fiber, screw temperature 290 ℃, spinning speed 1500m / min, drawing temperature 70~80℃, drafting ratio 3.35, pre-stretching 1.05, first drawing ratio 2.8, second drawing ratio 114, drawing speed 128m / min, drawing The bath is 70°C, the second drawing temperature is 80°C, and the relaxation temperature in each zone is 80°C / 80°C / 75°C / 75°C. dt, elongation 31.2%, 180 ℃ dry heat shrinkage 21.3%. The dye uptake rate of spun fiber with cationic blue X-GRRL dye at 95-100°C under normal pressure is 96.6%.

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Abstract

The invention relates to a method for preparing cationic dye deeply dyed copolyester fibers at normal pressure. The copolyester fibers are prepared by carrying out high speed pure melt spinning, composite spinning and blended spinning on copolyester chips jointly modified by a blend of aliphatic diols with side chains and m-benzene dibasic acid dibasic ester-5-sodium or potassium sulfonate. The method has the following beneficial effects: the fibers can be deeply dyed with cationic dyes or disperse dyes under the condition of boiling dyeing at normal pressure; the fibers and fabrics made from the fibers have soft handfeel, good resilience and excellent pilling resistance; the fabrics dispense with alkali treatment; the fibers are energy-saving, low-carbon and environmentally-friendly and can be widely used for pure spinning or blended spinning with such natural fibers as silk, tough silk, cotton, wool, twine and the like; the preparation process has no special requirements for equipment; and the fibers have low cost and are easy to realize industrialized production.

Description

technical field [0001] The invention belongs to the field of polyester fiber preparation, in particular to a method for preparing cationic dye deep dyed copolyester fiber under normal pressure. Background technique [0002] The textile industry is one of the pillar industries of my country's national economy. Polyester fiber is the most widely used textile fiber with the largest output in the textile industry. In 2009, my country's polyester fiber output has exceeded 22 million tons, accounting for 90% of the world's total polyester fiber output. 65%, ranking first in the world for 11 consecutive years. However, although my country is a big polyester production country, it is a country with weak polyester technology, prominent product isomorphism contradictions, and few varieties of differentiated and functional polyester fibers. Among all differentiated polyester fibers, polymer modification is the starting point of polyester fiber differentiation, and improving the dyeabil...

Claims

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Application Information

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IPC IPC(8): D01F6/84D01F8/14C08G63/688
Inventor 顾利霞付昌飞李发学蔡再生
Owner DONGHUA UNIV
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