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Melt anisotropic aromatic polyester fiber and method for producing same

An aromatic polyester, anisotropic technology, applied in the direction of one-component polyester rayon, one-component copolyester rayon, etc., can solve the problem of stretching impossible, melting anisotropic aromatic polyester Solve problems such as low elongation at break of ester fiber, and achieve excellent passability

Active Publication Date: 2016-10-26
SEIREN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, post-spinning stretching of highly oriented melt-anisotropic aromatic polyester fibers is almost impossible due to low elongation at break

Method used

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  • Melt anisotropic aromatic polyester fiber and method for producing same
  • Melt anisotropic aromatic polyester fiber and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] As an aromatic polyester showing melt anisotropy, a mixture of 40 moles of p-acetoxybenzoic acid, 15 moles of terephthalic acid, 5 moles of isophthalic acid and 20.2 moles of 4,4'-diacetoxybiphenyl was used. Polymerized aromatic polyester. The melting point of the aromatic polyester is 340°C, at the melting point +30°C, the shear rate is 1000sec -1 When the melt viscosity is 30 Poise. The aromatic polyester was dried in a vacuum dryer at 140° C. for 24 hours, and after the moisture content reached 5 ppm, it was melt-extruded by a single-screw extruder, metered by a gear pump, and the resin was supplied to a spinning package. The spinning temperature from the exit of the extruder to the spinning package at this time was 360°C. The resin was discharged at a discharge rate of 11.6 cc / min from a spinneret having 48 holes with a diameter of 0.09 mm. Oil was applied to the ejected resin, introduced to the first godet, and then introduced to the second godet, and 48 monofil...

Embodiment 2～16

[0080] Using the aromatic polyester used in Example 1, spinning was carried out in the same manner as in Example 1, except that the total fineness, single filament fineness, and spinning winding tension were changed as shown in Table 1, to obtain aromatic polyester fibers. Next, in the same manner as in Example 1, the obtained aromatic polyester fiber was rewound from the spinning reel onto a heat treatment reel, treated in nitrogen, and rewound from the heat treatment reel onto a paper tube to obtain a heat-treated Aromatic polyester fiber. As shown in Table 1, the rewinding of the aromatic polyester fiber was good without occurrence of monofilament breakage or broken filaments before and after heat treatment. The number of fuzz of the heat-treated fiber was also 0 in the measurement of 1 million m, and it was of good quality. In the guide rail running test, the amount of deposits on the guide rail was small, and the process passability was good.

Embodiment 17、18

[0082] Use at melting point +30°C, shear rate 1000sec -1 The aromatic polyesters having melt viscosities of 20 Poise and 40 Poise were spun in the same manner as in Example 1, except that the spinning temperature was changed, to obtain aromatic polyester fibers. Next, in the same manner as in Example 1, the obtained aromatic polyester fiber was rewound from the spinning reel onto a heat treatment reel, treated in nitrogen, and rewound from the heat treatment reel onto a paper tube to obtain a heat-treated Aromatic polyester fiber. As shown in Table 1, the rewinding of the aromatic polyester fiber was good without occurrence of monofilament breakage or broken filaments before and after heat treatment. The number of fuzz of the heat-treated fiber was also 0 in the measurement of 1 million m, and it was of good quality. In the guide rail running test, the amount of deposits on the guide rail was small, and the process passability was good.

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Abstract

Provided is a high-quality melt anisotropic aromatic polyester fiber which does not undergo fibrillation, single yarn breakage or the like during a rewinding process and a heat treatment process and therefore has excellent post-process passability in spite of the fact that the fiber has a small single yarn fineness degree. A melt anisotropic aromatic polyester fiber characterized by being a multi-filament which comprises an aromatic polyester that can exhibit anisotropic properties upon melting and which has a single yarn fineness degree of 4.0 dtex or less, and also characterized in that the number of fluffs is less than 3 per 1,000,000 m of the fiber. It is preferred that the aromatic polyester fiber has a total fineness degree of 10 to 500 dtex inclusive and the number of filaments falls within the range from 3 to 1000.

Description

technical field [0001] The present invention relates to fine fibers (composite yarns having a monofilament fineness of 4.0 dtex or less) formed of molten anisotropic aromatic polyester. Background technique [0002] Melt anisotropic aromatic polyester is a polymer formed of rigid molecular chains, and the molecular chains can be highly oriented along the fiber axis during melt spinning. In addition, it is known that the molten anisotropic aromatic polyester undergoes a polymerization reaction even in a solid state, and solid-phase polymerization occurs by heat-treating the spun fibers at a high temperature, and the fibers obtained by melt spinning can become Highest strength, modulus of elasticity. Due to these characteristics, at present, molten anisotropic aromatic polyester fibers have been used in gauze fabrics for screen printing, scrims, thread reinforcement materials for various electrical products, protective handbags, reinforcement materials for plastics, and tensi...

Claims

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Application Information

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IPC IPC(8): D01F6/62D01F6/84
CPCD01F6/62D01F6/84
Inventor 成泽达弥西村现
Owner SEIREN CO LTD
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