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Preparation method of polyester staple fiber used for vortex spinning

A polyester staple fiber, vortex spinning technology, applied in the direction of single-component copolyester rayon, etc., can solve the problems of poor molecular chain segment mobility, fluctuating diethylene glycol content, high nozzle air pressure, and achieve the failure rate of knotting Reduced, extended cleaning cycles, improved wear resistance

Active Publication Date: 2014-12-24
SINOPEC YIZHENG CHEM FIBER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since PET is a rigid high polymer, the mobility of its molecular chain segments is poor, the fiber modulus is high, the flexibility is small, and the handle is hard. The use of conventional PET as a raw material for vortex spinning further deepens the shortcomings of vortex yarns.
Therefore, the use of conventional PET polyester staple fiber to make raw materials for eddy current spinning inevitably brings the following disadvantages: ① poor quality of joints; ② high energy consumption
In vortex spinning production, in order to ensure the efficiency of twisting and yarn strength, when using rigid polyester fiber, the air pressure of the nozzle is controlled higher, and the energy consumption is higher than that of other yarns.
[0005] The document "The effect of adding diethylene glycol on improving the dyeability and spinnability of polyester" (Chemical Fiber and Textile Technology, 2006, 3, 16-17) reported that in the production of polyester filaments, changes in production load and raw materials are possible Causes fluctuations in the content of diethylene glycol in the finished product, which in turn affects the dyeing uniformity of the fiber

Method used

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  • Preparation method of polyester staple fiber used for vortex spinning
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  • Preparation method of polyester staple fiber used for vortex spinning

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preparation example Construction

[0020] The invention provides a method for preparing polyester staple fibers for vortex spinning. PTA and IPA are used as dibasic acids, EG is used as dibasic alcohols for esterification, and then DEG is added to polycondensate under catalyst catalysis to obtain copolyester. Then it is processed by polyester staple fiber spinning process to make polyester staple fiber for vortex spinning.

[0021] The preparation method of polyester staple fiber for vortex spinning of the present invention comprises the following steps:

[0022] In the esterification step, PTA, IPA, and EG are used as raw materials, and the esterification reaction is carried out at a temperature of 230-270 ° C and an absolute pressure of 0.1-0.3 MPa, and the esterification product is obtained after 1-5 hours of reaction;

[0023] In the polycondensation step, the esterification product is used as the raw material, and then DEG is added, under the catalysis of the catalyst, under the conditions of 240-285°C and...

Embodiment 1

[0031] On the 300L polymerization device, add PTA, IPA and EG into the polymerization kettle, the molar ratio of acid to alcohol is 1:1.39, the amount of IPA added is 1% of PTA (mass ratio, the same below), and the direct esterification reaction is at 230~ It is carried out at 270°C, the absolute pressure of the esterification reaction is 0.1-0.3 MPa, the by-product water and the remaining EG are distilled off, and the esterification reaction is completed in 2-3 hours. Then, using ethylene glycol antimony as a catalyst, the dosage is 300*10 -6 g ethylene glycol antimony / g (PTA+IPA), then add DEG accounting for 0.2% of the total ingredients of PTA, IPA and EG, start vacuuming, and raise the temperature. The polycondensation reaction is carried out under the pressure, and the reaction is completed in 3 to 4 hours (the intrinsic viscosity of the copolyester melt is controlled within the range of 0.65±0.03dl / g, the same below), and the copolyester chips are obtained by pelletizing...

Embodiment 2

[0033] On the 300L polymerization device, PTA, IPA and EG are added to the polymerization kettle, the molar ratio of acid to alcohol is 1:1.39, the amount of IPA added is 2% of PTA, and the direct esterification reaction is carried out at 230-270°C. The absolute pressure of the reaction is 0.1-0.3 MPa, the by-product water and the remaining EG are distilled off, and the esterification reaction is completed in 2-3 hours. Then, using ethylene glycol antimony as a catalyst, the dosage is 300*10 -6 g ethylene glycol antimony / g (PTA+IPA), then add DEG accounting for 0.5% of the total ingredients of PTA, IPA and EG, start vacuuming, and raise the temperature. The polycondensation reaction was carried out under the following conditions, and the reaction was completed in 3 to 4 hours. After pelletizing and drying, copolyester chips were obtained. The conventional properties are shown in Table 1.

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Abstract

The invention provides a preparation method of polyester staple fiber used for vortex spinning, which takes PTA and IPA as diacid, and takes EG as dihydric alcohol for performing an esterification reaction, then DEG is added, and is polycondensated under catalysis of a catalyst to prepare copolyester, and then the copolyester is treated through a polyester staple fiber spinning technology to prepare the polyester staple fiber used for vortex spinning. The IPA and DEG take effect together, the crystallization property of copolyester is decreased, the fiber modulus is reduced by 7-50%, breaking tenacity is reduced by 3-10%, hand feel flexibility can be greatly enhanced, and vortex spinning requirement can be satisfied.

Description

technical field [0001] The invention relates to a method for preparing polyester staple fibers for vortex spinning, and belongs to the technical field of polyester fiber synthesis and processing. Background technique [0002] Vortex spinning is a new spinning method developed on the basis of air-jet spinning. It mainly uses a fixed vortex spinning tube to replace a high-speed rotating spinning cup for spinning. In recent years, due to the excellent properties of vortex spinning, domestic vortex spinning has developed rapidly, and it occupies more and more shares in the domestic yarn market. The vortex spun yarn is a double-structure yarn, which has two parts, the core fiber and the outer fiber. The core fiber is arranged in parallel without twist, and the outer fiber is wrapped in a regular spiral on the surface of the core fiber. The outer layer of the vortex spun yarn is regularly helically wrapped with a large proportion of fibers, so that the inner untwisted fibers are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/84C08G63/672C08G63/86
Inventor 史利梅李映
Owner SINOPEC YIZHENG CHEM FIBER
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