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Method for preparing fine denier dyeable polypropylene fiber by sheath-core compounding

A polypropylene fiber and polypropylene resin technology is applied in the field of skin-core composite preparation of fine denier dyeable polypropylene fibers, which can solve the problems of spinning performance and mechanical properties decline, improve spinning processing performance, reduce melting point difference, cost reduction effect

Active Publication Date: 2012-10-10
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The dyeable polypropylene fiber patent disclosed above is mainly to prepare dyeable fine-denier polypropylene fiber through the conventional melt spinning technology route, and because of the dispersion of additives in the polypropylene base material, the spinning performance and mechanical properties are greatly improved. Decrease, generally only dyeable polypropylene with a monofilament size greater than 0.5dtex can be produced

Method used

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  • Method for preparing fine denier dyeable polypropylene fiber by sheath-core compounding
  • Method for preparing fine denier dyeable polypropylene fiber by sheath-core compounding
  • Method for preparing fine denier dyeable polypropylene fiber by sheath-core compounding

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Embodiment 1

[0017] A method for preparing fine-denier dyeable polypropylene fibers by sheath-core compounding in this embodiment includes the following steps: 1) Firstly, by 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 adipic acid accounting for 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 0.4dl / g; then subject the copolyester to solid-state polycondensation at 170°C and a vacuum of less than 1kpa for 36 hours to further improve its properties Viscosity increased to 0.8dl / 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 0.8 dl / g copolyester additive and the compatibilizer EPDM-g-M...

Embodiment 2

[0020] The preparation steps of the present embodiment are basically the same as in Example 1, except that the copolyester with an intrinsic viscosity of 0.8dl / g accounting for 10% of the total weight percentage of the additive, compatibilizer and polypropylene resin, accounting for the additive, EPDM-g-MAH with a total weight percentage of 2% of the compatibilizer and polypropylene resin and polypropylene resin with a melt index of 50g / 10min are blended and granulated at 200°C through a twin-screw extruder to obtain a dyeable Modified polypropylene resin, the measured average particle size of the dispersed phase is 0.92 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 ratio of skin layer to core layer is 30:70. The skin-core composite fine denier dyeable polypropylene fiber (110dtex / 144f pre-oriented yarn (POY)) was obtained. POY is then subjected ...

Embodiment 3

[0023] The preparation steps of the present embodiment are basically the same as in Example 1, except that the copolyester with an intrinsic viscosity of 15% of the total weight percentage of the additive, compatibilizer and polypropylene resin is 0.8dl / g, accounting for the additive, EPDM-g-MAH with a total weight percentage of 2% of the compatibilizer and polypropylene resin and polypropylene resin with a melt index of 50g / 10min are blended and granulated at 220°C through a twin-screw extruder to obtain a dyeable Modified polypropylene resin, the measured average particle size of the dispersed phase is 0.98 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 ratio of skin layer to core layer is 50:50. The skin-core composite fine denier dyeable polypropylene fiber (110dtex / 144f pre-oriented yarn (POY)) was obtained. POY is then subjected to the textu...

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Abstract

The invention discloses a method for preparing fine denier dyeable polypropylene fiber by sheath-core compounding. The method comprises the following steps: (1), copolyester additive is prepared through the method of combining melt phase polycondensation and solid phase polycondensation; (2), the additive, compatilizer for polyolefin elastomer to graft multiple monomers, and polypropylene resin are subjected to melt-blending granulation in a double-screw extruder, and the dyeable modified polypropylene resin with the dispersed phase grain diameter less than 1 mum is prepared; and (3), the dyeable modified polypropylene resin prepared in the step (2) is used as a sheath layer, the polypropylene resin is used as a core layer, and the sheath-core compounded fine denier dyeable polypropylene fiber with the monofilament fineness less than 0.5dtex is prepared. With the method, the operating performance is obviously improved, the mechanical property of the fiber is improved, and the cost is greatly reduced; and compared with single-component dyeable polypropylene fiber, the fine denier dyeable polypropylene fiber has the obvious advantages in the aspects of production efficiency, product quality, cost competitiveness and the like and also can meet the application requirement on high-grade clothing and home textile shell fabric.

Description

technical field [0001] The invention relates to a method for preparing fine-denier dyeable polypropylene fiber by sheath-core compounding. It belongs to the chemical fiber field. Background technique [0002] Conventional coarse denier polypropylene fiber has a waxy feel, poor air permeability and hygroscopicity. In addition, there are no polar groups on the molecular chain of conventional polypropylene, high crystallinity, and poor dyeing performance of polypropylene fibers, which limits its application in the fields of clothing and home textiles. In addition to the common characteristics of ordinary fine denier fibers such as softness, elegance, and skin-friendly, the fine-denier polypropylene filament also has the characteristics of good warmth retention, breathability, moisture conduction, hygiene, and lightness; it can be dyed and modified It overcomes the difficulty in adapting to small batches and changing market demands in the production of colored yarns by dope dye...

Claims

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Application Information

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IPC IPC(8): D01F6/46D01F1/10C08G63/183
Inventor 王秀华陈文兴姚玉元
Owner ZHEJIANG SCI-TECH UNIV
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