Preparation method of ultrafine composite fiber with high wet transmitting performance

Abstract

The invention discloses a preparation method of an ultrafine composite fiber with high wet transmitting performance, comprising the following steps of: 1) firstly preparing a copolyester additive having melting point of 180-220 DEG C and intrinsic viscosity of 1.0-1.2 dl / g and containing aliphatic dibasic acid and aliphatic dihydric alcohol by the combination of melt polycondensation and solid state polycondensation; 2) granulating by melt blending of the additive, a polyolefin elastomer graft multi-monomer compatilizer and polypropylene resin in a double screw extruder so as to prepare dyeable modified polypropylene resin with the particle size of dispersed phase being less than 1 micron; and 3) using the dyeable modified polypropylene resin prepared from the step 2) as a scaffold, using polyamide as splinter, and splitting fiber through mechanical force in subsequent alkali deweighting or processing into the ultrafine composite fiber with filament number being less than 0.2 dtex. The ultrafine composite fiber prepared by the method is soft, and has characteristics of high thermal stability, good spinning performance and excellent moisture conductivity and moisture absorption performance.

Description

technical field

[0001] The invention relates to a method for preparing ultrafine composite fibers with high moisture permeability. It belongs to the chemical fiber field. Background technique

[0002] Composite spinning methods for producing ultrafine denier fibers mainly include island-in-the-sea composite spinning and split-type composite spinning, among which split-type composite spinning is mainly based on polyester-nylon composite spinning, which utilizes the non-compatibility of polyester and nylon It is a relatively mature technology to obtain ultra-fine denier fibers by dividing fibers under the action of alkali reduction or certain mechanical force in the back channel.

[0003] Studies have shown that in addition to the common characteristics of ordinary fine denier fibers such as softness, elegance, and skin-friendliness, the fine-denier polypropylene fiber also has good warmth retention, breathability, moisture conduction, hygiene, and lightness. However, becaus...

Examples

Embodiment 1

[0019] A method for preparing an ultrafine composite fiber with high moisture permeability in this embodiment includes the following steps: 1) Firstly, through a method of combining melt polycondensation and solid-state polycondensation, using terephthalic acid and ethylene glycol as raw materials, The molar ratio of terephthalic acid to ethylene glycol is 1:1.2; add 30% of the molar percentage of terephthalic acid and 1,4- Butanediol, to synthesize a copolyester with a melting point of 180°C and an intrinsic viscosity of 0.5dl / g; then the copolyester is subjected to solid-state polycondensation for 36 hours at 170°C and a vacuum of less than 1kpa to further increase the intrinsic viscosity Increased to 1.0dl / g, copolyester additive with a melting point of 180°C; 2) The intrinsic viscosity of 5% of the total weight percentage of the additive, compatibilizer and polypropylene resin prepared in step 1) is 1.0dl / g copolyester additive and account for the compatibilizer EPDM-g-MA...

Embodiment 2

[0022] The preparation steps of the present embodiment are basically the same as in Example 1, except that the copolyester with an intrinsic viscosity of 1.0dl / g accounting for 10% of the total weight percentage of the additive, compatibilizer and polypropylene resin accounts for the additive, compatibilizer and polypropylene resin. EPDM-g-MAH with a total weight percentage of 2% of the compatibilizer and polypropylene resin and polypropylene with a melt index of 30g / 10min are blended and granulated at 200°C through a twin-screw extruder to prepare a dyeable modification containing additives. permanent polypropylene resin, the average particle size of the dispersed phase was measured to be 0.91 μm. See Table 1, which is a table showing the preparation process and results of the dyeable modified polypropylene resin in the embodiment of the present invention. The weight percentage of dyeable modified polypropylene resin and nylon is 70:30. Superfine composite fibers (165dtex / 36...

Embodiment 3

[0025] The preparation procedure of the present embodiment is basically the same as that of Example 1, the difference is: the copolyester with an intrinsic viscosity of 1.0dl / g accounting for 15% of the total weight percentage of the additive, compatibilizer and polypropylene resin, accounting for the additive, compatibilizer and polypropylene resin EPDM-g-MAH with a total weight percentage of 2% of the compatibilizer and polypropylene resin and polypropylene with a melt index of 30g / 10min are blended and granulated at 220°C through a twin-screw extruder to prepare a dyeable modified product containing additives. permanent polypropylene resin, and the average particle size of the dispersed phase was measured to be 0.95 μm. See Table 1, which is a table showing the preparation process and results of the dyeable modified polypropylene resin in the embodiment of the present invention. The weight percentage of dyeable modified polypropylene resin and nylon is 80:20. Superfine com...

technical field

[0001] The invention relates to a method for preparing ultrafine composite fibers with high moisture permeability. It belongs to the chemical fiber field. Background technique

[0002] Composite spinning methods for producing ultrafine denier fibers mainly include island-in-the-sea composite spinning and split-type composite spinning, among which split-type composite spinning is mainly based on polyester-nylon composite spinning, which utilizes the non-compatibility of polyester and nylon It is a relatively mature technology to obtain ultra-fine denier fibers by dividing fibers under the action of alkali reduction or certain mechanical force in the back channel.

[0003] Studies have shown that in addition to the common characteristics of ordinary fine denier fibers such as softness, elegance, and skin-friendliness, the fine-denier polypropylene fiber also has good warmth retention, breathability, moisture conduction, hygiene, and lightness. However, becaus...

Examples

Embodiment 1

[0019] A method for preparing an ultrafine composite fiber with high moisture permeability in this embodiment includes the following steps: 1) Firstly, through a method of combining melt polycondensation and solid-state polycondensation, using terephthalic acid and ethylene glycol as raw materials, The molar ratio of terephthalic acid to ethylene glycol is 1:1.2; add 30% of the molar percentage of terephthalic acid and 1,4- Butanediol, to synthesize a copolyester with a melting point of 180°C and an intrinsic viscosity of 0.5dl / g; then the copolyester is subjected to solid-state polycondensation for 36 hours at 170°C and a vacuum of less than 1kpa to further increase the intrinsic viscosity Increased to 1.0dl / g, copolyester additive with a melting point of 180°C; 2) The intrinsic viscosity of 5% of the total weight percentage of the additive, compatibilizer and polypropylene resin prepared in step 1) is 1.0dl / g copolyester additive and account for the compatibilizer EPDM-g-MA...

Embodiment 2

[0022] The preparation steps of the present embodiment are basically the same as in Example 1, except that the copolyester with an intrinsic viscosity of 1.0dl / g accounting for 10% of the total weight percentage of the additive, compatibilizer and polypropylene resin accounts for the additive, compatibilizer and polypropylene resin. EPDM-g-MAH with a total weight percentage of 2% of the compatibilizer and polypropylene resin and polypropylene with a melt index of 30g / 10min are blended and granulated at 200°C through a twin-screw extruder to prepare a dyeable modification containing additives. permanent polypropylene resin, the average particle size of the dispersed phase was measured to be 0.91 μm. See Table 1, which is a table showing the preparation process and results of the dyeable modified polypropylene resin in the embodiment of the present invention. The weight percentage of dyeable modified polypropylene resin and nylon is 70:30. Superfine composite fibers (165dtex / 36...

Embodiment 3

[0025] The preparation procedure of the present embodiment is basically the same as that of Example 1, the difference is: the copolyester with an intrinsic viscosity of 1.0dl / g accounting for 15% of the total weight percentage of the additive, compatibilizer and polypropylene resin, accounting for the additive, compatibilizer and polypropylene resin EPDM-g-MAH with a total weight percentage of 2% of the compatibilizer and polypropylene resin and polypropylene with a melt index of 30g / 10min are blended and granulated at 220°C through a twin-screw extruder to prepare a dyeable modified product containing additives. permanent polypropylene resin, and the average particle size of the dispersed phase was measured to be 0.95 μm. See Table 1, which is a table showing the preparation process and results of the dyeable modified polypropylene resin in the embodiment of the present invention. The weight percentage of dyeable modified polypropylene resin and nylon is 80:20. Superfine com...

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