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Preparation method of isomeric polyester sheath-core composite fiber

A composite fiber and homogeneous isomerization technology, which is applied in the field of polyester, can solve the problems of fiber-fiber bonding and detachment, and achieve the effects of enhancing bonding force, increasing contact area, and high mechanical strength

Pending Publication Date: 2022-07-22
JIANGSU JIANGNAN HIGH POLYMER FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims at the problem that the fiber and the fiber bond are detached due to the extrusion, stretching, bending and other forces of the three-dimensional non-woven material prepared by the hot air forming process of the existing skin-core composite low-melting point fiber. The preparation method of homogeneous polyester skin-core composite fiber can significantly improve the bonding strength between fibers, so as to realize the application in non-woven high resilience textiles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for preparing an isomeric polyester sheath-core composite fiber, which is specifically: composite spinning of low-melting polyester and block copolyester sheath-core composite fibers in a concentric structure, namely passing the low-melting polyester and the block copolyester through The composite fiber is prepared by the skin-core composite spinning method. The skin layer in the composite fiber is composed of low-melting polyester and pre-activated polymer, and the core layer is a block copolyester. The composite fiber is activated to prepare the isomeric polyester sheath-core composite fiber. Hot-air forming of isomeric polyester sheath-core composite fibers. In the hot-air forming process, the contact area between the fibers increases, and the reactive groups further react with the surface of the fibers, and the bonding strength is significantly improved.

[0026] In this embodiment, the melting point of the low-melting polyester is 100°C, and the intrinsic...

Embodiment 2

[0035] A method for preparing an isomeric polyester sheath-core composite fiber, specifically: preparing a composite fiber by a sheath-core composite spinning method with a low-melting polyester and a block copolyester, wherein the skin layer of the composite fiber is made of a low-melting polyester Composed of a pre-activated polymer, the core layer is a block copolyester. The composite fiber is activated to prepare the isomeric polyester sheath-core composite fiber. Hot-air forming of isomeric polyester sheath-core composite fibers. In the hot-air forming process, the contact area between the fibers increases, and the reactive groups further react with the fiber surface, and the bonding strength is significantly improved.

[0036] In this embodiment, the melting point of the low-melting polyester is 150°C, and the intrinsic viscosity is 0.55 dL / g; the low-melting polyester has a melt non-Newton index of 0.40-0.60 in the range of 200°C-250°C; The melting point polyester is ...

Embodiment 3

[0045] A method for preparing an isomeric polyester sheath-core composite fiber, specifically: preparing a composite fiber by a sheath-core composite spinning method with a low-melting polyester and a block copolyester, wherein the skin layer of the composite fiber is made of a low-melting polyester Composed of a pre-activated polymer, the core layer is a block copolyester. The composite fiber is activated to prepare the isomeric polyester sheath-core composite fiber. Hot-air forming of isomeric polyester sheath-core composite fibers. In the hot-air forming process, the contact area between the fibers increases, and the reactive groups further react with the fiber surface, and the bonding strength is significantly improved.

[0046] In this embodiment, the melting point of the low-melting polyester is 200°C, and the intrinsic viscosity is 0.65 dL / g; the low-melting polyester has a non-Newtonian index of 0.40-0.60 in the range of 200°C-250°C; The melting point polyester is in...

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Abstract

The invention discloses a preparation method of an isomeric polyester sheath-core composite fiber, which comprises the following steps: carrying out sheath-core composite spinning on low-melting-point polyester and block copolyester to prepare a composite fiber, a sheath layer in the composite fiber comprises the low-melting-point polyester and a pre-activated polymer, and a core layer is the block copolyester; activating the composite fiber to prepare an isomeric polyester sheath-core composite fiber; and carrying out hot air forming on the isomeric polyester sheath-core composite fiber. The main components of the skin layer and the core layer are polyesters, and have good interfacial compatibility. The composite fiber is activated by a certain alkaline aqueous solution, and a microporous structure with the diameter of 0.1-1.0 micron and rich reactive groups are formed on the surface of the activated composite fiber. In hot air bonding of the isomeric polyester sheath-core composite fibers, the contact area between the fibers is increased, meanwhile, the reactive groups further react with the surfaces of the fibers, and the bonding strength is comprehensively improved. The method can be applied to non-woven high-resilience textiles.

Description

technical field [0001] The invention belongs to the technical field of polyester, relates to the forming and application of polyester fibers, and in particular relates to a method for preparing a homomeric polyester sheath-core composite fiber. Background technique [0002] With the improvement of living standards and the rapid expansion of the non-woven industry, the filling and cushioning materials have entered the stage of upgrading. The traditional polyurethane foam materials have disadvantages such as poor ventilation and heat dissipation, easy aging, and the production of highly toxic hydrogen cyanide gas when burned. The application in areas with high safety and comfort requirements is obviously limited. In recent years, the emergence of polyester three-dimensional non-woven materials (also known as standing cotton) has provided people with a better choice. Generally, polyester fibers and low-melting fibers are used as raw materials. The multi-void three-dimensional ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F8/14D01F1/10D01F11/08D01D5/34D01D10/02
CPCD01F8/14D01F1/10D01F11/08D01D5/34D01D10/02
Inventor 钱燕明吉鹏陶冶孙帅
Owner JIANGSU JIANGNAN HIGH POLYMER FIBER
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