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Surface-cracked skin-core composite fiber and preparation method thereof

A composite fiber, skin-core technology, used in fiber processing, conjugated synthetic polymer rayon, filament/thread forming, etc., can solve problems such as insufficient

Active Publication Date: 2014-08-20
JIANGSU DELI CHEM FIBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is only the use of the inherent properties of PBT itself to achieve the purpose of improving the performance of composite fibers, which is far from enough for the research on PBT-PET skin-core composite fibers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A method for preparing a skin-core composite fiber with a cracked surface includes a method for preparing a low crystallization rate polyester and a method for preparing a skin-core composite fiber:

[0037] 1) The preparation method of the low crystallization rate polyester is divided into two steps: esterification reaction and polycondensation reaction:

[0038] The esterification reaction:

[0039] Using terephthalic acid, ethylene glycol, isophthalic acid and 1,4-cyclohexanediol as raw materials, the molar ratio of terephthalic acid:ethylene glycol:isophthalic acid: 1,4-cyclohexanediol =100:120:0.5:0.5, the esterification reaction is carried out after the uniform slurry is prepared; the esterification reaction is in a nitrogen atmosphere, the pressure is controlled at 0.4MPa, the temperature is controlled at 250℃, and the amount of esterified water distilled reaches the theoretical value 90% is the end point of the esterification reaction.

[0040] The polycondensation rea...

Embodiment 2

[0047] A method for preparing a skin-core composite fiber with a cracked surface includes a method for preparing a low crystallization rate polyester and a method for preparing a skin-core composite fiber:

[0048] 1) The preparation method of the low crystallization rate polyester is divided into two steps: esterification reaction and polycondensation reaction:

[0049] The esterification reaction:

[0050] Using terephthalic acid, ethylene glycol, isophthalic acid and 1,4-cyclohexanediol as raw materials, the molar ratio of terephthalic acid:ethylene glycol:isophthalic acid: 1,4-cyclohexanediol =100:120:1:2, the esterification reaction is carried out after the uniform slurry is prepared; the esterification reaction is pressurized in a nitrogen atmosphere, the pressure is controlled at 0.3MPa, the temperature is controlled at 245℃, and the amount of esterified water distilled reaches the theoretical level 90% of the value is the end point of the esterification reaction.

[0051] The...

Embodiment 3

[0058] A method for preparing a skin-core composite fiber with a cracked surface includes a method for preparing a low crystallization rate polyester and a method for preparing a skin-core composite fiber:

[0059] 1) The preparation method of the low crystallization rate polyester is divided into two steps: esterification reaction and polycondensation reaction:

[0060] The esterification reaction:

[0061] Using terephthalic acid, ethylene glycol, isophthalic acid and 1,4-cyclohexanediol as raw materials, the molar ratio of terephthalic acid:ethylene glycol:isophthalic acid: 1,4-cyclohexanediol =100:120:3:5, the esterification reaction is carried out after the uniform slurry is prepared; the esterification reaction is in a nitrogen atmosphere, the pressure is controlled at 0.4MPa, the temperature is controlled at 230℃, and the amount of esterified water distilled reaches the theoretical value 90% is the end point of the esterification reaction.

[0062] The polycondensation reactio...

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Abstract

The invention relates to a surface-cracked skin-core composite fiber and a preparation method thereof. The surface-cracked skin-core composite fiber is composed of a skin layer and a core layer, wherein the surface of the surface-cracked skin-core composite fiber has axial cracks, the skin layer is made of polyester with a high crystallization rate, and the core layer is made of polyester with a low crystallization rate. Since there is a difference value between the crystallization rates of the skin layer material and the core layer material, cooling crystallization conditions of the skin layer and the core layer are different when a fiber is jetted from a spinneret plate, cooled and drawn, the skin layer rapidly finishes crystallization while the core layer is slow in crystallization, and the skin layer easily produces axial cracks during drawing; and ordered control is carried out, so the surface-cracked skin-core composite fiber is obtained.

Description

Technical field [0001] The invention relates to a skin-core composite fiber and a preparation method thereof, in particular to a skin-core composite fiber with a cracked surface and a preparation method thereof. Background technique [0002] Polyester (PET) is currently one of the most widely used synthetic polymers. As early as the 1940s, PET was synthesized and found to have excellent performance. It is widely used in textiles, packaging, and medical applications. Sanitation, automobiles, electronic appliances, safety protection, environmental protection and other fields. With the progress of society and the improvement of people's living standards, the need for differentiation and functionalization of polyester fibers is getting higher and higher. The differentiated fibers of polyester are mainly based on morphology (fine denier, profiled cross-section, etc.), high performance (high strength, high modulus, low shrinkage, etc.), high functionality (high sensitivity, moisture a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/14D01D5/34D01D5/088C08G63/199
Inventor 赵金广倪凤军张秉怀唐辉王浩宋江颂沙跃蔡瑞杨培恒李振宇王雨生
Owner JIANGSU DELI CHEM FIBER CO LTD
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