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Polytrimethylene terephthalate, and its production and ptt fibre produced with the same

A technology of polytrimethylene terephthalate and trimethylene phthalate, which is applied in the field of PTT fiber and can solve problems such as poor spinning efficiency

Active Publication Date: 2006-11-29
HYOSUNG CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the case of using PTT with a number average molecular weight of 17,000 and a polydispersity index of 2.9 to produce fibers, the tenacity of the fibers was less than 3.5 g / d, and the spinning efficiency of PTT was poor compared to polyester produced by conventional methods

Method used

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  • Polytrimethylene terephthalate, and its production and ptt fibre produced with the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3 and comparative Embodiment 1-2

[0042] Add 300kg of polytrimethylene terephthalate resin to a volume of 1m 3 in the reactor. It was then processed under conditions as indicated in Table 1. The physical properties of the polytrimethylene terephthalate resin were measured before and after the treatment, and the results are shown in Table 1.

Embodiment 4

[0044] The resin treated according to Example 1 was subjected to a spinning drawing process to produce a raw yarn.

[0045] At this time, the spinning drawing process is performed under predetermined conditions including: a single fiber fineness of at least 1 denier, a speed of at least 3,000 m / min, a cooling air flow rate of 0.3 m / sec, and oil The stickiness was 0.7% by weight. Also, PTT is stretched and then heat set.

[0046] The first stretching temperature is 60-80°C, and the second stretching temperature is 110-170°C. In addition, the obtained PTT fiber had a tenacity of 4.1 g / d and an elongation of 31%.

[0047] In addition, the package change cycle (pack change cycle) was 7 days before treatment and extended to 14 days after treatment, and the number of yarn breaks during spinning was significantly reduced from 4 times / day to 1 time / day.

[0048]Circular knitting process is performed on PTT fiber using a 32 inch-28 caliber circular knitting machine, and dyed with Bl...

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Abstract

The invention relates to a PTT resin, which has a number average molecular weight of 20,000 or more and a polydispersity index, indicating a dispersibility of a molecular weight, of 1.3-2.7, a method of producing the same, and a PTT fiber produced using the same. The PTT resin is advantageous in that it has a uniform molecular weight distribution, and thus, an increase of a pack pressure is suppressed, a pack change cycle and a wiping cycle are lengthened in the spinning process of a PTT fiber. Thereby, the productivity of the PTT fiber is increased, the uniformity ratio of a grey yarn produced using the PTT fiber is increased, and the physical properties of the grey yarn are improved. Furthermore, the PTT fiber has a relatively high tenacity due to its relatively high molecular weight, and thus, the intrinsic and desirable physical properties of the PTT fiber, such as flexibility, elastic recovery, softness, resistance to chemicals, are scarcely reduced during subsequent processes, such as a false twisting process, a drawing process, a knitting process, and a weaving process. Additionally, the workability of the PTT fiber is improved in the subsequence processes, bringing about the reduction of the production costs the PTT fiber regardless of its uses, such as clothes or industrial fibers.

Description

technical field [0001] The present invention relates to polytrimethylene terephthalate (PTT) resin having high toughness, its production method, and PTT fiber produced using the same, said polytrimethylene terephthalate (PTT) resin having at least 20,000 Number average molecular weight (Mn) and polydispersity index (PDI) of 1.3-2.7, polydispersity index indicates the dispersion of molecular weight. Background technique [0002] WO 99 / 11709 discloses a process for producing PTT having an intrinsic viscosity of 0.4-2.0 dl / g using phosphorus compounds and metal compounds as polycondensation solvents. [0003] The present invention has conducted in-depth research on the production of PTT, and found that the number-average molecular weight and polydispersity index of PTT have a greater impact on the quality of PTT than the intrinsic viscosity of PTT. [0004] Generally, PTT produced by conventional methods has a number average molecular weight of 17,000 and a polydispersity inde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/181D01F6/62C08G63/183C08G63/80C08G63/88H04B1/40
CPCC08G63/183C08G63/80C08G63/88D01F6/62C08G63/78
Inventor 金圣柱孙亮国权益铉
Owner HYOSUNG CORP