A skin-core composite fiber with cracked surface and its preparation method

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

Active Publication Date: 2018-02-02
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 surface-cracked skin-core composite fiber, including 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 of esterification reaction and polycondensation reaction:

[0038] Described 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, make a homogeneous slurry and carry out the esterification reaction; the esterification reaction is carried out in a nitrogen atmosphere, the pressure is controlled at 0.4MPa, the temperature is controlled at 250°C, and the distilled amount of esterified water reaches the theoretical value 90% is the end point of the esterification reaction.

[0040] Described ...

Embodiment 2

[0047] A method for preparing a surface-cracked skin-core composite fiber, including 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 of esterification reaction and polycondensation reaction:

[0049] Described 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, make a uniform slurry and carry out the esterification reaction; the esterification reaction is pressurized in a nitrogen atmosphere, the pressure is controlled at 0.3MPa, the temperature is controlled at 245°C, and the amount of esterified water distilled reaches the theoretical 90% of the value is the end point of the esterification reaction.

[0051] Described ...

Embodiment 3

[0058] A method for preparing a surface-cracked skin-core composite fiber, including 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 of esterification reaction and polycondensation reaction:

[0060] Described 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, make a homogeneous slurry and carry out the esterification reaction; the esterification reaction is carried out in a nitrogen atmosphere, the pressure is controlled at 0.4MPa, the temperature is controlled at 230°C, and the distilled amount of esterified water reaches the theoretical value 90% is the end point of the esterification reaction.

[0062] Described pol...

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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, and has axial cracks on the surface. The material used for the skin layer is polyester with a high crystallization rate, and the material used for the core layer is polyester with a low crystallization rate. Due to the difference in the crystallization rate between the skin layer material and the core layer material, the cooling crystallization conditions of the skin layer and the core layer are different during the process of fiber ejection from the spinneret to cooling and stretching. The skin layer crystallizes quickly while the core layer is slower. When stretching, the cortex is prone to axial cracks, and the skin-core composite fibers with surface cracks are obtained through orderly control.

Description

technical field [0001] The invention relates to a skin-core composite fiber and a preparation method thereof, in particular to a surface-cracked skin-core composite fiber and a preparation method thereof. Background technique [0002] Polyester (PET) is one of the most widely used synthetic polymers by humans. PET was synthesized as early as the 1940s, and it was found to have excellent properties, and it is widely used in textiles, packaging, and medical treatment. 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 demand for the differentiation and functionalization of polyester fibers is getting higher and higher. The differentiated fibers of polyester are mainly characterized by form (fine denier, special-shaped cross-section, etc.), high performance (high strength, high modulus, low shrinkage, etc.), high function (high sensitivi...

Claims

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Application Information

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Patent Type & Authority Patents(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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