Preparation method of isomeric polyester sheath-core composite fiber

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 ...

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