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Method for preparing superfine dyeable polypropylene fiber by sea-island composite spinning method

A polypropylene fiber and composite spinning technology, which is applied in the manufacture of rayon, fiber chemical characteristics, conjugated synthetic polymer rayon, etc., can solve the problems of fiber having no practical value, mechanical properties, and spinnability , achieve the effect of improving spinning processing performance, improving compatibility and reducing melting point difference

Inactive Publication Date: 2012-10-10
ZHEJIANG SCI-TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is necessary to prepare dyeable ultra-fine denier polypropylene fiber with a monofilament fineness of less than 0.2dtex, the dispersibility of the additive in the matrix polypropylene is very important. If the dispersed particle size is too large, it will easily lead to broken ends, greatly reduced spinnability Unable to produce a head; secondly, the mechanical properties are greatly reduced, and the fiber has no practical value

Method used

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  • Method for preparing superfine dyeable polypropylene fiber by sea-island composite spinning method
  • Method for preparing superfine dyeable polypropylene fiber by sea-island composite spinning method
  • Method for preparing superfine dyeable polypropylene fiber by sea-island composite spinning method

Examples

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Embodiment 1

[0018] A method for preparing superfine dyeable polypropylene fibers by the sea-island composite spinning method in this embodiment includes the following steps: 1) First, by combining melt polycondensation and solid-state polycondensation, terephthalic acid, ethylene glycol As a raw material, 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 for 36 hours at 170°C and a vacuum of less than 1kpa, and further Increase the intrinsic viscosity to 0.8dl / g, a copolyester additive with a melting point of 180°C; 2) The intrinsic viscosity prepared in step 1) that accounts for 5% of the total weight percentage of the additive, compatibilizer and polypropylene resin Be 0.8dl / g copolyester additive and account for ad...

Embodiment 2

[0021] 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 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 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 dyeable modified polypropylene resin to nylon is 70:30. A pre-oriented yarn (POY) of 180 dtex / 24f x 21 islands was produced. After POY is...

Embodiment 3

[0024] The preparation procedure of the present embodiment is basically the same as that of Example 1, the difference being: the copolyester with an intrinsic viscosity of 0.8dl / g accounting for 15% of the total weight percentage of additives, compatibilizers and polypropylene resins, accounting for additives, compatibilizers and polypropylene resins, 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 dyeable modified polypropylene resin to nylon is 75:25. A pre-oriented yarn (POY) of 180 dtex / 24f x 21 islands was prod...

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Abstract

The invention discloses a method for preparing superfine dyeable polypropylene fiber by a sea-island composite spinning method. 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 island, alkaline solubility polyester is used as sea, and the sea-island composite processing is carried out; and the fiber is subjected to decrement by the later alkali, and the superfine dyeable polypropylene fiber with the monofilament fineness less than 0.2dtex is prepared. According to the superfine dyeable polypropylene fiber prepared by the method, the thermostability is high, the spinning processability is good, and fabric woven by the fiber has the superior properties of lightness, mildness, breathability and warm keeping, and is particularly suitable for high-grade bedding, high-grade underwear and the like.

Description

technical field [0001] The invention relates to a method for preparing superfine dyeable polypropylene fibers by a sea-island composite spinning method. 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 yar...

Claims

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Application Information

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IPC IPC(8): D01F8/06D01F8/14D01F1/10C08G63/183
Inventor 王秀华徐双喜杨国军杨美桂
Owner ZHEJIANG SCI-TECH UNIV
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