Sea-island fiber adopting PET as island component, preparation method thereof, and superfine fiber formed by sea-island fiber

A sea-island fiber and ultra-fine fiber technology, used in fiber processing, filament/thread forming, textile and papermaking, etc., can solve the problem of spinning, setting temperature and drying temperature not too high, unstable PET island component structure, etc. problem, to achieve good spinnability

Pending Publication Date: 2020-09-04
上海市合成纤维研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If LDPE is used as the sea component and ethylene terephthalate (PET) is used as the island component to prepare LDPE / PET island-fixed sea-island fibers, it is limited by the huge difference in melting point between the two (temperature difference > 80°C). The requirements for the spinning process and equipment are relatively high; especially in the presence of LDPE, the setting temperature and drying temperature in the post-drawing process should not be too high (temperature ≤ 120 ° C), under this condition, the PET island component structure is not stable, reducing the application value of the sea-island fiber
[0006] The hot water dissolving type (hot water dissolving method) is disclosed in CN108589028A, CN108589028A, CN108505190A, CN108589028A, CN108486683A and CN108424601A, adopts polyvinyl alcohol (PVA) as the sea phase of sea-island fiber, if the island component is PET, there are sea-island two The temperature difference of phase spinning is large (temperature difference > 80 ℃), and it is difficult to spin on ordinary sea-island spinning equipment. In addition, the existence of water must be avoided in the process of drawing, post-drawing, and application before fiber opening, otherwise the fiber will be damaged. Bonding occurs, seriously affecting the performance of the fiber
The recovery and reuse value of the polyvinyl alcohol aqueous solution after fiber opening is low, and if it is directly discharged, it will cause a waste of resources
In addition, the PVA sea components disclosed in the above-mentioned patents contain additives such as polyols or salt compound modifiers, antioxidants and lubricants (the total content accounts for at least 15% of the sea components), all of which increase the treatment of fiber-opening wastewater. difficulty and cost
[0007] In summary, when using PET as the island component to prepare PET ultrafine fibers, there are problems such as sea-island fiber spinning, fiber opening, environmental pollution, and waste of resources.

Method used

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  • Sea-island fiber adopting PET as island component, preparation method thereof, and superfine fiber formed by sea-island fiber
  • Sea-island fiber adopting PET as island component, preparation method thereof, and superfine fiber formed by sea-island fiber
  • Sea-island fiber adopting PET as island component, preparation method thereof, and superfine fiber formed by sea-island fiber

Examples

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preparation example Construction

[0068] More specifically, the preparation method of the modified polyester comprises:

[0069] 1) Ethylene glycol and terephthalic acid undergo esterification reaction; the temperature of the esterification reaction is 240-270°C; the time of the esterification reaction is 2-4h;

[0070] 2) Add isophthalic acid dibasic acid ester-5-sodium sulfonate or isophthalic acid dibasic acid ester-5-potassium sulfonate, and add 2-methyl-1,3-propanediol and 1,3- Propylene glycol is transesterified; the temperature of the transesterification reaction is 240-270°C; the time of the transesterification reaction is 1-3h;

[0071] 3) adding catalyst and heat stabilizer to carry out polycondensation reaction; the temperature of polycondensation reaction is 270-300°C; the time of polycondensation reaction is 2-4h; the catalyst is antimony trioxide; the heat stabilizer is trimethyl phosphate or phosphoric acid Triphenyl ester; the added amount of the heat stabilizer is 0.02% to 0.06% of the mass o...

Embodiment 1

[0076] In this example, the molar ratio of terephthalic acid, ethylene glycol, isophthalic acid dibasic acid ester-5-sulfonate sodium or potassium, 2-methyl-1,3-propanediol and 1,3-propanediol The ratio is 1:2.0:0.05:0.10:0.08, and the modified copolyester is formed by the above-mentioned method.

[0077] In this example, the sea component of the island-in-the-sea fiber uses the above-mentioned modified copolyester, and the island component uses PET. In this example, the mass ratio of the sea component to the island component is 1:7.

[0078] Using melt composite spinning technology, the island component PET is fed into the first screw extruder for melt extrusion, and at the same time, the sea component modified copolyester is fed into the second screw extruder for extrusion; the first The temperature in the five zones in the screw extruder is 275°C-280°C, 280°C-285°C, 285°C-290°C, 285°C-290°C, 290°C-295°C; the temperature in the five zones in the second screw extruder is 250...

Embodiment 2

[0082] In this example, the molar ratio of terephthalic acid, ethylene glycol, isophthalic acid dibasic acid ester-5-sulfonate sodium or potassium, 2-methyl-1,3-propanediol and 1,3-propanediol The ratio is 1:1.5:0.03:0.05:0.10, and the modified copolyester is formed by the above-mentioned method.

[0083] In this example, the sea component of the island-in-the-sea fiber uses the above-mentioned modified copolyester, and the island component uses PET. In this example, the mass ratio of the sea component to the island component is 1:5.

[0084] Using melt composite spinning technology, the island component PET is fed into the first screw extruder for melt extrusion, and at the same time, the sea component modified copolyester is fed into the second screw extruder for extrusion; the first The temperature in the five zones in the screw extruder is 275°C-280°C, 280°C-285°C, 285°C-290°C, 285°C-290°C, 290°C-295°C; the temperature in the five zones in the second screw extruder is 250℃~...

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Abstract

The invention provides a sea-island fiber adopting PET as an island component, a preparation method thereof, and a superfine fiber formed by the sea-island fiber. The sea-island fiber adopting the PETas the island component adopts modified copolyester as a sea component. The modified copolyester is adopted as a sea material of the sea-island fiber, and the PET is adopted as an island material, sothat the formed sea-island fiber has good spinnability; and in addition, due to the characteristic of the modified copolyester, the sea-island fiber can be split under a mild condition, and the mildslitting condition cannot affect physical and chemical properties of the island component PET, so that the performance of the PET superfine fiber formed by the island component cannot be damaged.

Description

technical field [0001] The invention relates to the technical field of superfine fibers, in particular to a sea-island fiber with PET as an island component and a preparation method thereof. Background technique [0002] Sea-island fiber is to disperse one polymer in another polymer. The dispersed phase in the fiber cross-section is in the state of "island", while the matrix corresponds to the "sea". From the cross-section of the fiber, it is a kind of composition in the form of fine And the scattered state is surrounded by another component, as if there are many islands in the sea. [0003] The island-in-the-sea fiber adopts composite spinning technology to use two fiber-forming polymers as "island" and "sea" components respectively, and melt-spins them according to different ratios, and then utilizes the different chemical solvents of these two components. Solubility or decomposability, remove the "sea" component and leave the "island" component to obtain ultrafine fibers...

Claims

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Application Information

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IPC IPC(8): D01F8/14C08G63/688D01D5/30
CPCD01F8/14C08G63/6886D01D5/30Y02P70/62
Inventor 付昌飞李赛解德诚邢亚均石浩然顾进魏怡雯薛丽云曹伟新钱桢英崔厚平
Owner 上海市合成纤维研究所有限公司
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