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A kind of high-shrinkage nylon 6 superfine fiber and preparation method thereof

A technology of superfine fiber and high shrinkage, applied in the direction of fiber chemical characteristics, rayon manufacturing, single-component polyamide rayon, etc., can solve the problems of poor fiber shrinkage and complicated preparation process, achieve high shrinkage rate, improve The effect of work efficiency

Active Publication Date: 2019-09-27
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

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a high-shrinkage nylon 6 ultrafine fiber and its preparation method, to overcome the defects of poor fiber shrinkage and complicated preparation process in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of nylon 6 island-in-the-sea fiber is disclosed in this embodiment, the island component of the ultrafine island-in-sea fiber is PA6, and the sea component is COPET; wherein, the island component contains a metal salt, and the content of the salt is the set 5 wt% of the content of the island component.

[0031] The metal salts are chlorides of metals K, Na, Mg and Ca. In this embodiment, it is specifically calcium chloride.

[0032] The PA6 is nylon 6. The number average molecular weight of the PA6 is 1.3×10 4 ~1.5×10 4 .

[0033] COPET is a block copolymer composed of high melting point, high hardness crystalline polyester hard segment and amorphous polyether or polyester soft segment with low glass transition temperature. It is alkali soluble.

[0034] Specifically, the structure of the hard segment of the high-hardness crystalline polyester is

[0035] Specifically, the structure of the soft segment is

[0036] The number average molecular weight o...

Embodiment 2

[0050] A nylon 6 sea-island fiber is disclosed in this embodiment, the island component of the nylon 6 sea-island fiber is PA6, and the sea component is COPET; wherein, the island component contains a metal salt, and the content of the salt is 3 wt% of the content of the island component.

[0051] The metal salts are chlorides of metals K, Na, Mg and Ca. In this embodiment, it is specifically potassium chloride.

[0052] The PA6 is nylon 6. The number average molecular weight of the PA6 is 1.3×10 4 ~1.5×10 4 .

[0053] COPET is a block copolymer composed of high melting point, high hardness crystalline polyester hard segment and amorphous polyether or polyester soft segment with low glass transition temperature. It is alkali soluble.

[0054] Specifically, the structure of the hard segment of the high-hardness crystalline polyester is

[0055] Specifically, the structure of the soft segment is

[0056] The number average molecular weight of the COPET is 10×10 4 ~13×...

Embodiment 3

[0070] A kind of nylon 6 island-in-the-sea fiber is disclosed in this embodiment, the island component of the ultrafine island-in-sea fiber is PA6, and the sea component is COPET; wherein, the island component contains a metal salt, and the content of the salt is the set 3 wt% of the content of the island component.

[0071] The metal salts are chlorides of metals K, Na, Mg and Ca. In this embodiment, it is specifically sodium chloride.

[0072] The PA6 is nylon 6. The number average molecular weight of the PA6 is 1.3×10 4 ~1.5×10 4 .

[0073] COPET is a block copolymer composed of high melting point, high hardness crystalline polyester hard segment and amorphous polyether or polyester soft segment with low glass transition temperature. It is alkali soluble.

[0074] Specifically, the structure of the hard segment of the high-hardness crystalline polyester is

[0075] Specifically, the structure of the soft segment is

[0076] The number average molecular weight of...

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Abstract

The invention discloses a PA6 (polyamide 6) sea-island fiber. The superfine sea-island fiber is prepared from an island component (PA6) and a sea component (COPET), wherein the island component contains metal salt; the content of salt accounts for 0.1 to 5wt% of the island component. The PA6 sea-island fiber has the advantages that the metal salt and the polyamide 6 form a complex, the formation of hydrogen bond between the PA6 as well as between the PA6 and the COPET is inhibited, the crystallizing degree in the PA6 is reduced, the sea component is favorably dissolved and removed in the sea dissolving process, and the working efficiency in the sea dissolving process is improved; the fiber bundle with high orientation degree and low crystallizing degree after traction is obtained in the traction and shaping process; when the sea component is removed in the sea dissolving process with alkaline reduction, the metal salt in the island component is also removed, the fiber bundle is disorientated, the crystal grain size is increased, the fiber is shrunk, and the fiber with high shrinkage rate is obtained.

Description

technical field [0001] The invention relates to a high-shrinkage superfine fiber, in particular to a nylon 6 sea-island fiber, a nylon 6 superfine fiber and a preparation method thereof. Background technique [0002] Island-in-the-sea composite fibers, also known as hyperconjugate fibers, matrix fibril fibers, which are formed by embedding one polymer (fibril) in another polymer (matrix) in a very fine form , and because the dispersed phase fibrils are island-like in the fiber cross-section, they are called sea-island fibers. The island-in-the-sea fiber dissolves the sea component to obtain superfine fibers, and removes the island component to obtain a porous hollow fiber with a honeycomb structure. Generally, the island-in-the-sea fiber refers to the former. [0003] The invention patent with application number 201180007739X discloses sea-island composite fibers, superfine fibers and composite spinnerets. Among them, the island component is irregular superfine denier, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F8/12D01F8/14D01F1/10D01F11/08D01F6/60
Inventor 解德诚付昌飞李赛顾进邢亚均
Owner 上海市合成纤维研究所有限公司
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