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Method for preparing continuous polymerization directly-spun high-shrinkage polyester filaments

A polyester filament, high shrinkage technology, applied in the direction of single-component copolyester rayon, melt spinning, feeding solution to the spinneret, etc., can solve the problem of the inherent quality, viscosity, etc. Large fluctuations in indicators, differences in product performance and other problems, to achieve the effects of excellent spinning performance, stable product quality, and stable shrinkage

Inactive Publication Date: 2010-07-28
ZHEJIANG SCI-TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The modified copolyester chips produced on the batch polymerization device have large fluctuations in the viscosity and other indicators of the same batch of materials due to different discharge times, and between batches, due to the cracking of the residual melt on the inner wall of the reactor, etc., It is easy to cause differences in product performance between batches, and these problems will directly affect the spinning performance of post-processing and the intrinsic quality of the final product
At the same time, the modified copolyester chips need to be recrystallized, dried and melted. The process is long, the production links are many, and the production cost is high.

Method used

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  • Method for preparing continuous polymerization directly-spun high-shrinkage polyester filaments

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The preparation process of modified copolyester: set the production capacity of 5000kg / hr on the continuous polyester equipment, and purify terephthalic acid, isophthalic acid and ethylene glycol monomers according to the proportion of isophthalic acid in the total binary The molar percentage of acid is 8.0, the total dibasic acid (the sum of purified terephthalic acid and isophthalic acid) and glycol (EG) are added to the slurry tank at a molar ratio of 1:1.20, and at the same time, the beating tank is added The polycondensation catalyst ethylene glycol antimony of 450PPM (the weight percentage of the total production capacity), the above slurry is continuously and stably transported to the esterification-I reactor, and the pressure of the esterification-I reactor is controlled to be 0.12MPa, the temperature is 258.0°C, and the material level is 60.0 %, record the rate of esterification as 88.1%, the material in the esterification-I reactor is sent in the esterification...

Embodiment 2

[0020] The method of the present embodiment is basically the same as in Example 1, except that isophthalic acid accounts for 11.0 molar percentages of the total dibasic acids, controls the temperature of the esterification-I reactor at 259.0° C., and records an esterification rate of 88.5%. , control the temperature of the esterification-II reactor at 261°C, the measured esterification rate is 98.2%, and then pump the prepolymer to the polycondensation section, and obtain the modified copolyester according to the conventional polycondensation process. (See Table 1 for the results)

Embodiment 3

[0022] The method of the present embodiment is basically the same as in Example 1, except that isophthalic acid accounts for 14.0 molar percentages of the total dibasic acids, controls the temperature of the esterification-I reactor at 260.0° C., and records an esterification rate of 90.1%. , control the temperature of the esterification-II reactor at 262°C, and the measured esterification rate is 98.5%, and then pump the prepolymer to the polycondensation section, and obtain the modified copolyester according to the conventional polycondensation process. (See Table 1 for the results)

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Abstract

The invention discloses a method for preparing continuous polymerization directly-spun high-shrinkage polyester filaments, which comprises a process for preparing continuous polymerization modified copolyester melt and a process for preparing directly-spun cation-dyeable high-shrinkage polyester filaments. In the process for preparing the continuous polymerization modified copolyester melt, purified terephthalic acid, isophthalic acid and glycol monomers are taken as raw materials to prepare the modified copolyester melt; and the copolyester melt directly passes through a melt conveying piping equipment, and is metered, extruded, blown to be cooled, drawn for heat shaping, and wound to prepare one of high-shrinkage polyester preoriented yarns and high-shrinkage polyester drawn yarns. The method has the advantages of short flow, less working procedures, reasonable process, stable melt quality, and good spinning performance; and the prepared high-shrinkage fibers have good shrinkage stability and even dyeing, and the production cost is reduced obviously.

Description

technical field [0001] The invention relates to a method for manufacturing modified copolyester filaments, in particular to a method for continuously polymerizing direct-spun high-shrinkage polyester filaments, and belongs to the field of chemical fibers. Background technique [0002] Conventional polyester fibers have higher crystallinity and lower heat shrinkage, generally lower than 10%. With the continuous expansion of the application field of polyester fiber and the continuous development of new fabric products, the demand for high-shrinkage polyester fiber with higher shrinkage rate is increasing, and various types of high-shrinkage polyester fiber have been successfully developed. [0003] High-shrinkage fibers refer to chemical fibers whose shrinkage is greater than 25% in boiling water or dry heat. Depending on the degree of heat shrinkage, final products with different styles and properties can be obtained. This feature can be used to produce a variety of fabrics...

Claims

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Application Information

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IPC IPC(8): D01F6/84C08G63/183D01D5/10D01D1/09
Inventor 王秀华孙燕琳李红良
Owner ZHEJIANG SCI-TECH UNIV
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